#include "ir.h"
#include "ir_aarch64.h"
#include "ir_private.h"

#ifdef _WIN32
# define IR_SET_ALIGNED(alignment, decl) __declspec(align(alignment)) decl
#elif defined(HAVE_ATTRIBUTE_ALIGNED)
# define IR_SET_ALIGNED(alignment, decl) decl __attribute__ ((__aligned__ (alignment)))
#else
# define IR_SET_ALIGNED(alignment, decl) decl
#endif

#if IR_DEBUG
# define DASM_CHECKS
#endif

#include "dynasm/dasm_proto.h"
#include "dynasm/dasm_arm64.h"

|.arch arm64

|.actionlist dasm_actions
|.globals ir_lb
|.section code, cold_code, rodata, jmp_table

#define IR_SPILL_POS_TO_OFFSET(offset) \
	((ctx->flags & IR_USE_FRAME_POINTER) ? \
		((offset) + sizeof(void*) * 2) : \
		((offset) + data->call_stack_size))

/* Determine whether "val" falls into two allowed ranges:
 *   Range 1: [0, 0xfff]
 *   Range 2: LSL #12 to Range 1
 * Used to guard the immediate encoding for add/adds/sub/subs/cmp/cmn instructions. */
static bool aarch64_may_encode_imm12(const int64_t val)
{
	return (val >= 0 && (val <= 0xfff || !(val & 0xffffffffff000fff)));
}

/* Determine whether an immediate value can be encoded as the immediate operand of logical instructions. */
static bool aarch64_may_encode_logical_imm(uint64_t value, uint32_t type_size)
{
	/* fast path: power of two */
	if (value > 0 && !(value & (value - 1))) {
		return 1;
	}

	if (type_size == 8) {
		if (dasm_imm13((uint32_t)value, (uint32_t)(value >> 32)) != -1) {
			return 1;
		}
	} else {
		if (dasm_imm13((uint32_t)value, (uint32_t)value) != -1) {
			return 1;
		}
	}

	return 0;
}

static bool aarch64_may_encode_addr_offset(int64_t offset, uint32_t type_size)
{
	//???
	return 0;
}

|.macro ASM_REG_OP, op, type, reg
||	switch (ir_type_size[type]) {
||		case 1:
|			op Rb(reg)
||			break;
||		case 2:
|			op Rw(reg)
|| 			break;
||		case 4:
|			op Rd(reg)
|| 			break;
||		case 8:
|			op Rq(reg)
|| 			break;
|| 		default:
||			IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_MEM_OP, op, type, mem
||	switch (ir_type_size[type]) {
||		case 1:
|			op byte mem
||			break;
||		case 2:
|			op word mem
|| 			break;
||		case 4:
|			op dword mem
|| 			break;
||		case 8:
|			op qword mem
|| 			break;
|| 		default:
||			IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_MREF_OP, op, type, ref
||	do {
||		int32_t offset = ir_ref_spill_slot(ctx, ref);
||		ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
|		ASM_MEM_OP op, type, [Ra(fp)+offset]
||	} while (0);
|.endmacro

|.macro ASM_REG_REG_OP, op, type, dst, src
||	if (ir_type_size[type] == 8) {
|		op Rx(dst), Rx(src)
||	} else {
|		op Rw(dst), Rw(src)
||	}
|.endmacro

|.macro ASM_REG_REG_REG_OP, op, type, dst, src1, src2
||	if (ir_type_size[type] == 8) {
|		op Rx(dst), Rx(src1), Rx(src2)
||	} else {
|		op Rw(dst), Rw(src1), Rw(src2)
||	}
|.endmacro

|.macro ASM_REG_REG_REG_REG_OP, op, type, dst, src1, src2, src3
||	if (ir_type_size[type] == 8) {
|		op Rx(dst), Rx(src1), Rx(src2), Rx(src3)
||	} else {
|		op Rw(dst), Rw(src1), Rw(src2), Rw(src3);
||	}
|.endmacro

|.macro ASM_REG_REG_IMM_OP, op, type, dst, src1, val
||	if (ir_type_size[type] == 8) {
|		op Rx(dst), Rx(src1), #val
||	} else {
|		op Rw(dst), Rw(src1), #val
||	}
|.endmacro

|.macro ASM_REG_REG_OP2, op, type, dst, src
||	switch (ir_type_size[type]) {
||		case 1:
||		case 2:
|			op Rw(dst), Rw(src)
|| 			break;
||		case 4:
|			op Rd(dst), Rd(src)
|| 			break;
||		case 8:
|			op Rq(dst), Rq(src)
|| 			break;
|| 		default:
||			IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_REG_IMM_OP, op, type, reg, val
||	if (ir_type_size[type] == 8) {
|		op Rx(reg), #val
||	} else {
|		op Rw(reg), #val
||	}
|.endmacro

|.macro ASM_MEM_REG_OP, op, type, dst, src
||	switch (ir_type_size[type]) {
||		case 1:
|			op byte dst, Rb(src)
||			break;
||		case 2:
|			op word dst, Rw(src)
|| 			break;
||		case 4:
|			op dword dst, Rd(src)
|| 			break;
||		case 8:
|			op qword dst, Rq(src)
|| 			break;
|| 		default:
||			IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_MEM_IMM_OP, op, type, dst, src
||	switch (ir_type_size[type]) {
||		case 1:
|			op byte dst, src
||			break;
||		case 2:
|			op word dst, src
|| 			break;
||		case 4:
|			op dword dst, src
|| 			break;
||		case 8:
|			op qword dst, src
|| 			break;
|| 		default:
||			IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_REG_MEM_OP, op, type, dst, src
||	switch (ir_type_size[type]) {
||		case 1:
|			op Rb(dst), byte src
||			break;
||		case 2:
|			op Rw(dst), word src
|| 			break;
||		case 4:
|			op Rd(dst), dword src
|| 			break;
||		case 8:
|			op Rq(dst), qword src
|| 			break;
|| 		default:
||			IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_REG_MREF_OP, _op, type, dst, src
||	if (IR_IS_CONST_REF(src)) {
||		ir_insn *_insn = &ctx->ir_base[src];
||		IR_ASSERT(IR_IS_SIGNED_32BIT(_insn->val.i64));
|		ASM_REG_IMM_OP _op, type, dst, _insn->val.i32
||	} else {
||		int32_t offset = ir_ref_spill_slot(ctx, src);
||		ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
|		ASM_REG_MEM_OP _op, type, dst, [Ra(fp)+offset]
||	}
|.endmacro

|.macro ASM_MREF_REG_OP, op, type, dst, src
||	do {
||		int32_t offset = ir_ref_spill_slot(ctx, dst);
||		ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
|		ASM_MEM_REG_OP op, type, [Ra(fp)+offset], src
||	} while (0);
|.endmacro

|.macro ASM_MREF_IMM_OP, op, type, dst, src
||	do {
||		int32_t offset = ir_ref_spill_slot(ctx, dst);
||		ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
|		ASM_MEM_IMM_OP op, type, [Ra(fp)+offset], src
||	} while (0);
|.endmacro

|.macro ASM_REG_REG_IMUL, type, dst, src
||	switch (ir_type_size[type]) {
||		case 2:
|			imul Rw(dst), Rw(src)
|| 			break;
||		case 4:
|			imul Rd(dst), Rd(src)
|| 			break;
||		case 8:
|			imul Rq(dst), Rq(src)
|| 			break;
|| 		default:
||			IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_REG_IMM_IMUL, type, dst, src
||	switch (ir_type_size[type]) {
||		case 2:
|			imul Rw(dst), src
|| 			break;
||		case 4:
|			imul Rd(dst), src
|| 			break;
||		case 8:
|			imul Rq(dst), src
|| 			break;
|| 		default:
||			IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_REG_MEM_IMUL, type, dst, src
||	switch (ir_type_size[type]) {
||		case 2:
|			imul Rw(dst), word src
|| 			break;
||		case 4:
|			imul Rd(dst), dword src
|| 			break;
||		case 8:
|			imul Rq(dst), qword src
|| 			break;
|| 		default:
||			IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_REG_MREF_IMUL, type, dst, src
||	if (IR_IS_CONST_REF(src)) {
||		ir_insn *_insn = &ctx->ir_base[src];
||		IR_ASSERT(IR_IS_SIGNED_32BIT(_insn->val.i64));
|		ASM_REG_IMM_IMUL type, dst, _insn->val.i32
||	} else {
||		int32_t offset = ir_ref_spill_slot(ctx, src);
||		ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
|		ASM_REG_MEM_IMUL type, dst, [Ra(fp)+offset]
||	}
|.endmacro

|.macro ASM_FP_REG_REG_REG_OP, op, type, dst, src1, src2
||	if (type == IR_DOUBLE) {
|		op Rd(dst-IR_REG_FP_FIRST), Rd(src1-IR_REG_FP_FIRST), Rd(src2-IR_REG_FP_FIRST)
||	} else {
||		IR_ASSERT(type == IR_FLOAT);
|		op Rs(dst-IR_REG_FP_FIRST), Rs(src1-IR_REG_FP_FIRST), Rs(src2-IR_REG_FP_FIRST)
||	}
|.endmacro

|.macro ASM_FP_REG_MEM_OP, fop, dop, type, dst, src
||	if (type == IR_FLOAT) {
|		fop xmm(dst-IR_REG_FP_FIRST), dword src
||	} else if (type == IR_DOUBLE) {
|		dop xmm(dst-IR_REG_FP_FIRST), qword src
||	} else {
||		IR_ASSERT(0);
||	}
|.endmacro

|.macro ASM_FP_REG_MREF_OP, fop, dop, type, dst, src
||	if (IR_IS_CONST_REF(src)) {
||		ir_insn *_insn = &ctx->ir_base[src];
||		int label = ctx->cfg_blocks_count - src;
||		_insn->emit_const = 1;
|		ASM_SSE2_REG_MEM_OP fop, dop, type, dst, [=>label]
||	} else {
||		int32_t offset = ir_ref_spill_slot(ctx, src);
||		ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
|		ASM_SSE2_REG_MEM_OP fop, dop, type, dst, [Ra(fp)+offset]
||	}
|.endmacro

|.macro ASM_FP_MEM_REG_OP, fop, dop, type, dst, src
||	if (type == IR_FLOAT) {
|		fop dword dst, xmm(src-IR_REG_FP_FIRST)
||	} else if (type == IR_DOUBLE) {
|		dop qword dst, xmm(src-IR_REG_FP_FIRST)
||	} else {
||		IR_ASSERT(0);
||	}
|.endmacro

typedef struct _ir_backend_data {
    ir_reg_alloc_data  ra_data;
	int32_t            stack_frame_alignment;
	int32_t            call_stack_size;
	ir_regset          used_preserved_regs;
	uint32_t           dessa_from_block;
	dasm_State        *dasm_state;
	int                rodata_label, jmp_table_label;
} ir_backend_data;

#define IR_GP_REG_NAME(code, name64, name32) \
	#name64,
#define IR_GP_REG_NAME32(code, name64, name32) \
	#name32,
#define IR_FP_REG_NAME(code, name64, name32, name16, name8) \
	#name64,
#define IR_FP_REG_NAME32(code, name64, name32, name16, name8) \
	#name32,

static const char *_ir_reg_name[IR_REG_NUM] = {
	IR_GP_REGS(IR_GP_REG_NAME)
	IR_FP_REGS(IR_FP_REG_NAME)
};

static const char *_ir_reg_name32[IR_REG_NUM] = {
	IR_GP_REGS(IR_GP_REG_NAME32)
	IR_FP_REGS(IR_FP_REG_NAME32)
};

/* Calling Convention */
static const int8_t _ir_int_reg_params[IR_REG_INT_ARGS] = {
	IR_REG_INT_ARG1,
	IR_REG_INT_ARG2,
	IR_REG_INT_ARG3,
	IR_REG_INT_ARG4,
	IR_REG_INT_ARG5,
	IR_REG_INT_ARG6,
	IR_REG_INT_ARG7,
	IR_REG_INT_ARG8,
};

static const int8_t _ir_fp_reg_params[IR_REG_FP_ARGS] = {
	IR_REG_FP_ARG1,
	IR_REG_FP_ARG2,
	IR_REG_FP_ARG3,
	IR_REG_FP_ARG4,
	IR_REG_FP_ARG5,
	IR_REG_FP_ARG6,
	IR_REG_FP_ARG7,
	IR_REG_FP_ARG8,
};

const char *ir_reg_name(int8_t reg, ir_type type)
{
	IR_ASSERT(reg >= 0 && reg < IR_REG_NUM);
	if (ir_type_size[type] == 8) {
		return _ir_reg_name[reg];
	} else {
		return _ir_reg_name32[reg];
	}
	IR_ASSERT(0);
	return NULL;
}

typedef enum _ir_rule {
	IR_SKIP = IR_LAST_OP,
	IR_SKIP_REG,
	IR_CMP_INT,              // res=reg({%rax,%rbx,%rcx,%rdx}), op1=reg(GP), op2=reg(GP)|mem|imm
	                         // res=reg({%rax,%rbx,%rcx,%rdx}), op1=mem, op2=reg(GP)|imm
	IR_CMP_FP,               // res=reg({%rax,%rbx,%rcx,%rdx}), op1=reg(FP), op2=reg(FP)|mem

	IR_MUL_PWR2,
	IR_DIV_PWR2,
	IR_MOD_PWR2,

	IR_OP_INT,
	IR_OP_FP,
	IR_BINOP_INT,			 // res=reg(GP), op1.reg(GP, hint=res), op2=any
	IR_BINOP_FP,			 // res=reg(FP), op1.reg(FP, hint=res), op2=reg(FP)|mem
	IR_SHIFT,                // res=reg(GP), op1.reg(GP, hint=res), op2=%rcx
	IR_SHIFT_CONST,          // res=reg(GP), op1.reg(GP, hint=res), imm
	IR_COPY_INT,             // res=reg(GP), op1=reg(GP)|mem|imm
	                         // res=mem, op1=reg(GP)|imm
	IR_COPY_FP,              // res=reg(FP), op1=reg(FP)|mem
	                         // res=mem, op2=reg(GP)
	IR_CMP_AND_BRANCH_INT,   // op1=reg(GP), op2=reg(GP)|mem|imm
	                         // op1=mem, op2=reg(GP)|imm
	IR_CMP_AND_BRANCH_FP,    // op1=reg(FP), op2=reg(FP)|mem
	IR_OVERFLOW_AND_BRANCH,
	IR_MIN_MAX_INT,

//???	IR_SKIP_BINOP_INT,
//???	IR_SKIP_SHIFT,

	IR_VLOAD_INT,
	IR_VLOAD_FP,
	IR_VSTORE_INT,
	IR_VSTORE_FP,
	IR_LOAD_INT,
	IR_LOAD_FP,
	IR_STORE_INT,
	IR_STORE_FP,
	IR_IF_INT,               // op1=reg(GP)|mem
	IR_RETURN_VOID,          //
	IR_RETURN_INT,           // op1=reg(GP, hint=%rax)|mem|imm
	IR_RETURN_FP,            // op1=reg(FP, hint=%xmm0)|mem
} ir_rule;

/* instruction selection */

bool ir_needs_vreg(ir_ctx *ctx, ir_ref ref)
{
	IR_ASSERT(ctx->rules);
	return ctx->rules[ref] != IR_SKIP;
}

ir_regset ir_get_scratch_regset(ir_ctx *ctx, ir_ref ref, ir_live_pos *start, ir_live_pos *end)
{
	ir_ref rule;

	rule = ctx->rules[ref];
	if (rule == IR_CALL) {
		*start = IR_USE_SUB_REF;
		*end = IR_DEF_SUB_REF;
		return IR_REGSET_SCRATCH;
	}
	return IR_REGSET_EMPTY;
}

static ir_reg ir_get_param_reg(ir_ctx *ctx, ir_ref ref)
{
	ir_use_list *use_list = &ctx->use_lists[1];
	int i;
	ir_ref use, *p;
	ir_insn *insn;
	int int_param = 0;
	int fp_param = 0;
	int int_reg_params_count = IR_REG_INT_ARGS;
	int fp_reg_params_count = IR_REG_FP_ARGS;
	const int8_t *int_reg_params = _ir_int_reg_params;
	const int8_t *fp_reg_params = _ir_fp_reg_params;

	for (i = 0, p = &ctx->use_edges[use_list->refs]; i < use_list->count; i++, p++) {
		use = *p;
		insn = &ctx->ir_base[use];
		if (insn->op == IR_PARAM) {
			if (IR_IS_TYPE_INT(insn->type)) {
				if (use == ref) {
					if (int_param < int_reg_params_count) {
						return int_reg_params[int_param];
					} else {
						return IR_REG_NONE;
					}
				}
				int_param++;
			} else if (IR_IS_TYPE_FP(insn->type)) {
				if (use == ref) {
					if (fp_param < fp_reg_params_count) {
						return fp_reg_params[fp_param];
					} else {
						return IR_REG_NONE;
					}
				}
				fp_param++;
			} else {
				IR_ASSERT(0);
			}
		}
	}
	return IR_REG_NONE;
}

static ir_reg ir_get_arg_reg(ir_ctx *ctx, ir_insn *insn, int op_num)
{
	int j, n;
	ir_type type;
	int int_param = 0;
	int fp_param = 0;
	int int_reg_params_count = IR_REG_INT_ARGS;
	int fp_reg_params_count = IR_REG_FP_ARGS;
	const int8_t *int_reg_params = _ir_int_reg_params;
	const int8_t *fp_reg_params = _ir_fp_reg_params;

	n = ir_input_edges_count(ctx, insn);
	for (j = 3; j <= n; j++) {
		type = ctx->ir_base[insn->ops[j]].type;
		if (IR_IS_TYPE_INT(type)) {
			if (j == op_num) {
				if (int_param < int_reg_params_count) {
					return int_reg_params[int_param];
				} else {
					return IR_REG_NONE;
				}
			}
			int_param++;
		} else if (IR_IS_TYPE_FP(type)) {
			if (j == op_num) {
				if (fp_param < fp_reg_params_count) {
					return fp_reg_params[fp_param];
				} else {
					return IR_REG_NONE;
				}
			}
			fp_param++;
		} else {
			IR_ASSERT(0);
		}
	}
	return IR_REG_NONE;
}

ir_reg ir_uses_fixed_reg(ir_ctx *ctx, ir_ref ref, int op_num)
{
	ir_ref rule;

	rule = ctx->rules[ref];
	if (rule == IR_RETURN_INT) {
		if (op_num == 2) {
			return IR_REG_INT_RET1;
		}
	} else if (rule == IR_RETURN_FP) {
		if (op_num == 2) {
			return IR_REG_FP_RET1;
		}
	} else if (rule == IR_SKIP_REG) {
		if (ctx->ir_base[ref].op == IR_PARAM && op_num == 0) {
			return ir_get_param_reg(ctx, ref);
		}
	} else if (rule == IR_CALL || (rule == IR_TAILCALL && op_num > 0)) {
		ir_insn *insn = &ctx->ir_base[ref];
		if (op_num == 0) {
			if (IR_IS_TYPE_INT(insn->type)) {
				return IR_REG_INT_RET1;
			} else {
				return IR_REG_FP_RET1;
			}
		} else {
			return ir_get_arg_reg(ctx, insn, op_num);
		}
	}
	return IR_REG_NONE;
}

static bool ir_call_needs_tmp_int_reg(ir_ctx *ctx, ir_ref ref)
{
	ir_insn *insn = &ctx->ir_base[ref];
	ir_ref arg;
	ir_insn *arg_insn;
	int j, n;
	ir_type type;
	int int_param = 0;
	int int_reg_params_count = IR_REG_INT_ARGS;

	n = ir_input_edges_count(ctx, insn);
	for (j = 3; j <= n; j++) {
		arg = insn->ops[j];
		arg_insn = &ctx->ir_base[arg];
		type = arg_insn->type;
		if (IR_IS_TYPE_INT(type)) {
			if (int_param < int_reg_params_count) {
				if (int_param > 0) {
					return 1; /* for swap */
				}
			} else if (IR_IS_CONST_REF(arg) && arg_insn->op == IR_STR) {
				return 1;
			} else {
				return 0;
			}
			int_param++;
		} else if (type == IR_DOUBLE) {
			if (IR_IS_CONST_REF(arg) && arg_insn->val.i64 != 0) {
				return 1;
			}
		}
	}
	return 0;
}

uint8_t ir_get_def_flags(ir_ctx *ctx, ir_ref ref)
{
	ir_ref rule = ctx->rules[ref];
	ir_insn *insn;

	switch (rule) {
		case IR_SKIP_REG: /* PARAM PHI PI */
			insn = &ctx->ir_base[ref];
			if (insn->op == IR_PARAM) {
				if (ir_get_param_reg(ctx, ref) == IR_REG_NONE) {
					return IR_USE_MUST_BE_IN_REG;
				}
			}
			return IR_USE_SHOULD_BE_IN_REG;
	}

	return IR_USE_MUST_BE_IN_REG;
}

uint8_t ir_get_use_flags(ir_ctx *ctx, ir_ref ref, int op_num)
{
	ir_ref rule = ctx->rules[ref];
	ir_insn *insn;

	IR_ASSERT(op_num > 0);
	switch (rule) {
		case IR_CALL:
		case IR_TAILCALL:
			if (op_num > 2) {
				return IR_USE_SHOULD_BE_IN_REG;
			}
			return IR_USE_MUST_BE_IN_REG;
		case IR_SEXT:
		case IR_ZEXT:
		case IR_TRUNC:
		case IR_BITCAST:
		case IR_RETURN_INT:
		case IR_RETURN_FP:
		case IR_SKIP_REG: /* PARAM PHI PI */
			return IR_USE_SHOULD_BE_IN_REG;
	}

	return IR_USE_MUST_BE_IN_REG;
}

int ir_get_temporary_regs(ir_ctx *ctx, ir_ref ref, ir_tmp_reg *tmp_regs)
{
	ir_ref rule;
	ir_insn *insn;
	int n;

	rule = ctx->rules[ref];
	switch (rule) {
		case IR_BINOP_INT:
			insn = &ctx->ir_base[ref];
			n = 0;
			if (IR_IS_CONST_REF(insn->op1)) {
				tmp_regs[n].num = 1;
				tmp_regs[n].type = insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			if (IR_IS_CONST_REF(insn->op2) && insn->op1 != insn->op2) {
				ir_insn *val_insn = &ctx->ir_base[insn->op2];
				switch (insn->op) {
					case IR_ADD:
					case IR_ADD_OV:
					case IR_SUB:
					case IR_SUB_OV:
						if (!aarch64_may_encode_imm12(val_insn->val.u64)) {
							tmp_regs[n].num = 2;
							tmp_regs[n].type = insn->type;
							tmp_regs[n].start = IR_LOAD_SUB_REF;
							tmp_regs[n].end = IR_DEF_SUB_REF;
							n++;
						}
						break;
					case IR_AND:
					case IR_OR:
					case IR_XOR:
						if (!aarch64_may_encode_logical_imm(val_insn->val.u64, ir_type_size[insn->type])) {
							tmp_regs[n].num = 2;
							tmp_regs[n].type = insn->type;
							tmp_regs[n].start = IR_LOAD_SUB_REF;
							tmp_regs[n].end = IR_DEF_SUB_REF;
							n++;
						}
						break;
					case IR_MUL:
					case IR_DIV:
					case IR_MOD:
						tmp_regs[n].num = 2;
						tmp_regs[n].type = insn->type;
						tmp_regs[n].start = IR_LOAD_SUB_REF;
						tmp_regs[n].end = IR_DEF_SUB_REF;
						n++;
						break;
				}
			}
			if (insn->op == IR_MOD) {
				tmp_regs[n].num = 3;
				tmp_regs[n].type = insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			return n;
		case IR_MUL_PWR2:
		case IR_DIV_PWR2:
		case IR_MOD_PWR2:
		case IR_SHIFT:
		case IR_SHIFT_CONST:
		case IR_OP_INT:
		case IR_OP_FP:
		case IR_SEXT:
		case IR_ZEXT:
//???		case IR_TRUNC:
//???		case IR_BITCAST:
		case IR_INT2FP:
		case IR_FP2INT:
		case IR_FP2FP:
			insn = &ctx->ir_base[ref];
			n = 0;
			if (IR_IS_CONST_REF(insn->op1)) {
				tmp_regs[n].num = 1;
				tmp_regs[n].type = insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			if (rule == IR_SHIFT && insn->op == IR_ROL) {
				tmp_regs[n].num = 3;
				tmp_regs[n].type = insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			return n;
		case IR_BINOP_FP:
		case IR_MIN_MAX_INT:
			insn = &ctx->ir_base[ref];
			n = 0;
			if (IR_IS_CONST_REF(insn->op1)) {
				tmp_regs[n].num = 1;
				tmp_regs[n].type = insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			if (IR_IS_CONST_REF(insn->op2) && insn->op1 != insn->op2) {
				tmp_regs[n].num = 2;
				tmp_regs[n].type = insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			return n;
		case IR_CMP_INT:
			insn = &ctx->ir_base[ref];
			n = 0;
cmp_int:
			if (IR_IS_CONST_REF(insn->op1)) {
				tmp_regs[n].num = 1;
				tmp_regs[n].type = insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			if (IR_IS_CONST_REF(insn->op2) && insn->op1 != insn->op2) {
				insn = &ctx->ir_base[insn->op2];
				if (!aarch64_may_encode_imm12(insn->val.u64)) {
					tmp_regs[n].num = 2;
					tmp_regs[n].type = insn->type;
					tmp_regs[n].start = IR_LOAD_SUB_REF;
					tmp_regs[n].end = IR_DEF_SUB_REF;
					n++;
				}
			}
			return n;
		case IR_CMP_FP:
			insn = &ctx->ir_base[ref];
			tmp_regs[0].num = 3;
			tmp_regs[0].type = IR_BOOL;
			tmp_regs[0].start = IR_DEF_SUB_REF;
			tmp_regs[0].end = IR_SAVE_SUB_REF;
			n = 1;
cmp_fp:
			if (IR_IS_CONST_REF(insn->op1)) {
				ir_insn *val_insn = &ctx->ir_base[insn->op1];
				tmp_regs[n].num = 1;
				tmp_regs[n].type = val_insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			if (IR_IS_CONST_REF(insn->op2) && insn->op1 != insn->op2) {
				ir_insn *val_insn = &ctx->ir_base[insn->op2];
				tmp_regs[n].num = 2;
				tmp_regs[n].type = val_insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			return n;
#if 0 //???
		case IR_SKIP_BINOP_INT:
			insn = &ctx->ir_base[ref];
			if (IR_IS_CONST_REF(insn->op2) && insn->op1 != insn->op2) {
				insn = &ctx->ir_base[insn->op2];
				if (ir_type_size[insn->type] == 8 && !IR_IS_32BIT(insn->type, insn->val)) {
					tmp_regs[0].num = 2;
					tmp_regs[0].type = insn->type;
					tmp_regs[0].start = IR_LOAD_SUB_REF;
					tmp_regs[0].end = IR_DEF_SUB_REF;
					return 1;
				}
			}
			break;
		case IR_VSTORE_INT:
		case IR_STORE_INT:
			insn = &ctx->ir_base[ref];
			if (IR_IS_CONST_REF(insn->op3)) {
				insn = &ctx->ir_base[insn->op3];
				if (ir_type_size[insn->type] == 8 && !IR_IS_32BIT(insn->type, insn->val)) {
					tmp_regs[0].num = 3;
					tmp_regs[0].type = insn->type;
					tmp_regs[0].start = IR_LOAD_SUB_REF;
					tmp_regs[0].end = IR_DEF_SUB_REF;
					return 1;
				}
			}
			break;
		case IR_VSTORE_FP:
		case IR_STORE_FP:
			insn = &ctx->ir_base[ref];
			if (IR_IS_CONST_REF(insn->op3)) {
				insn = &ctx->ir_base[insn->op3];
				tmp_regs[0].num = 3;
				tmp_regs[0].type = insn->type;
				tmp_regs[0].start = IR_LOAD_SUB_REF;
				tmp_regs[0].end = IR_DEF_SUB_REF;
				return 1;
			}
			break;
		case IR_SWITCH:
			insn = &ctx->ir_base[ref];
			n = 0;
			if (IR_IS_CONST_REF(insn->op2)) {
				insn = &ctx->ir_base[insn->op2];
				tmp_regs[n].num = 2;
				tmp_regs[n].type = insn->type;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			if (sizeof(void*) == 8) {
				tmp_regs[n].num = 3;
				tmp_regs[n].type = IR_ADDR;
				tmp_regs[n].start = IR_LOAD_SUB_REF;
				tmp_regs[n].end = IR_DEF_SUB_REF;
				n++;
			}
			return n;
		case IR_CALL:
		case IR_TAILCALL:
			if (ir_call_needs_tmp_int_reg(ctx, ref)) {
				tmp_regs[0].num = 1;
				tmp_regs[0].type = IR_ADDR;
				tmp_regs[0].start = IR_LOAD_SUB_REF;
				tmp_regs[0].end = IR_USE_SUB_REF;
				return 1;
			}
			break;
#endif
		case IR_SKIP:
			insn = &ctx->ir_base[ref];
			switch (insn->op) {
				case IR_EQ:
				case IR_NE:
				case IR_LT:
				case IR_GE:
				case IR_LE:
				case IR_GT:
				case IR_ULT:
				case IR_UGE:
				case IR_ULE:
				case IR_UGT:
					if (IR_IS_TYPE_INT(ctx->ir_base[insn->op1].type)) {
						/* part of IR_CMP_AND_BRANCH_INT */
						n = 0;
						goto cmp_int;
					} else {
						/* part of IR_CMP_AND_BRANCH_FP */
						n = 0;
						goto cmp_fp;
					}
					break;
			}
			break;
	}
	return 0;
}

static uint32_t ir_match_insn(ir_ctx *ctx, ir_ref ref, ir_block *bb)
{
	ir_insn *op2_insn;
	ir_insn *insn = &ctx->ir_base[ref];

	switch (insn->op) {
		case IR_EQ:
		case IR_NE:
		case IR_LT:
		case IR_GE:
		case IR_LE:
		case IR_GT:
		case IR_ULT:
		case IR_UGE:
		case IR_ULE:
		case IR_UGT:
			if (IR_IS_TYPE_INT(ctx->ir_base[insn->op1].type)) {
				return IR_CMP_INT;
			} else {
				return IR_CMP_FP;
			}
			break;
		case IR_ADD:
		case IR_SUB:
			if (IR_IS_TYPE_INT(insn->type)) {
				if ((ctx->flags & IR_OPT_CODEGEN) && IR_IS_CONST_REF(insn->op2)) {
					op2_insn = &ctx->ir_base[insn->op2];
					if (IR_IS_CONST_REF(insn->op1)) {
						// const
					} else if (op2_insn->val.i64 == 0) {
						return IR_COPY_INT;
					}
				}
binop_int:
				return IR_BINOP_INT;
			} else {
binop_fp:
				return IR_BINOP_FP;
			}
			break;
		case IR_MUL:
			if (IR_IS_TYPE_INT(insn->type)) {
				if ((ctx->flags & IR_OPT_CODEGEN) && IR_IS_CONST_REF(insn->op2)) {
					op2_insn = &ctx->ir_base[insn->op2];
					if (IR_IS_CONST_REF(insn->op1)) {
						// const
					} else if (op2_insn->val.u64 == 0) {
						// 0
					} else if (op2_insn->val.u64 == 1) {
						return IR_COPY_INT;
					} else if (IR_IS_POWER_OF_TWO(op2_insn->val.u64)) {
						return IR_MUL_PWR2; // shl op1, IR_LOG2(op2_insn->val.u64)
					}
				}
				return IR_BINOP_INT;
			} else {
				goto binop_fp;
			}
			break;
		case IR_ADD_OV:
		case IR_SUB_OV:
			IR_ASSERT(IR_IS_TYPE_INT(insn->type));
			goto binop_int;
		case IR_MUL_OV:
			IR_ASSERT(IR_IS_TYPE_INT(insn->type));
IR_ASSERT(0);//???
			goto binop_int;
		case IR_DIV:
			if (IR_IS_TYPE_INT(insn->type)) {
				if ((ctx->flags & IR_OPT_CODEGEN) && IR_IS_CONST_REF(insn->op2)) {
					op2_insn = &ctx->ir_base[insn->op2];
					if (IR_IS_CONST_REF(insn->op1)) {
						// const
					} else if (op2_insn->val.u64 == 1) {
						return IR_COPY_INT;
					} else if (IR_IS_POWER_OF_TWO(op2_insn->val.u64)) {
						return IR_DIV_PWR2; // shr op1, IR_LOG2(op2_insn->val.u64)
					}
				}
				return IR_BINOP_INT;
			} else {
				goto binop_fp;
			}
			break;
		case IR_MOD:
			if ((ctx->flags & IR_OPT_CODEGEN) && IR_IS_CONST_REF(insn->op2)) {
				op2_insn = &ctx->ir_base[insn->op2];
				if (IR_IS_CONST_REF(insn->op1)) {
					// const
				} else if (IR_IS_POWER_OF_TWO(op2_insn->val.u64)) {
					return IR_MOD_PWR2; // and op1, op2_insn->val.u64-1
				}
			}
			return IR_BINOP_INT;
		case IR_BSWAP:
		case IR_NOT:
			if (IR_IS_TYPE_INT(insn->type)) {
				return IR_OP_INT;
			} else {
				IR_ASSERT(0);
			}
			break;
		case IR_NEG:
		case IR_ABS:
			if (IR_IS_TYPE_INT(insn->type)) {
				return IR_OP_INT;
			} else {
				return IR_OP_FP;
			}
		case IR_OR:
			if ((ctx->flags & IR_OPT_CODEGEN) && IR_IS_CONST_REF(insn->op2)) {
				op2_insn = &ctx->ir_base[insn->op2];
				if (IR_IS_CONST_REF(insn->op1)) {
					// const
				} else if (op2_insn->val.i64 == 0) {
					return IR_COPY_INT;
				} else if (op2_insn->val.i64 == -1) {
					// -1
				}
			}
			goto binop_int;
		case IR_AND:
			if ((ctx->flags & IR_OPT_CODEGEN) && IR_IS_CONST_REF(insn->op2)) {
				op2_insn = &ctx->ir_base[insn->op2];
				if (IR_IS_CONST_REF(insn->op1)) {
					// const
				} else if (op2_insn->val.i64 == 0) {
					// 0
				} else if (op2_insn->val.i64 == -1) {
					return IR_COPY_INT;
				}
			}
			goto binop_int;
		case IR_XOR:
			if ((ctx->flags & IR_OPT_CODEGEN) && IR_IS_CONST_REF(insn->op2)) {
				op2_insn = &ctx->ir_base[insn->op2];
				if (IR_IS_CONST_REF(insn->op1)) {
					// const
				}
			}
			goto binop_int;
		case IR_SHL:
			if (IR_IS_CONST_REF(insn->op2)) {
				if (ctx->flags & IR_OPT_CODEGEN) {
					op2_insn = &ctx->ir_base[insn->op2];
					if (IR_IS_CONST_REF(insn->op1)) {
						// const
					} else if (op2_insn->val.u64 == 0) {
						return IR_COPY_INT;
					} else if (ir_type_size[insn->type] >= 4) {
						if (op2_insn->val.u64 == 1) {
							// lea [op1*2]
						} else if (op2_insn->val.u64 == 2) {
							// lea [op1*4]
						} else if (op2_insn->val.u64 == 3) {
							// lea [op1*8]
						}
					}
				}
				return IR_SHIFT_CONST;
			}
			return IR_SHIFT;
		case IR_SHR:
		case IR_SAR:
		case IR_ROL:
		case IR_ROR:
			if (IR_IS_CONST_REF(insn->op2)) {
				if (ctx->flags & IR_OPT_CODEGEN) {
					op2_insn = &ctx->ir_base[insn->op2];
					if (IR_IS_CONST_REF(insn->op1)) {
						// const
					} else if (op2_insn->val.u64 == 0) {
						return IR_COPY_INT;
					}
				}
				return IR_SHIFT_CONST;
			}
			return IR_SHIFT;
		case IR_MIN:
		case IR_MAX:
			if (IR_IS_TYPE_INT(insn->type)) {
				return IR_MIN_MAX_INT;
			} else {
				goto binop_fp;
			}
			break;
//		case IR_COND:
		case IR_COPY:
			if (IR_IS_TYPE_INT(insn->type)) {
				return IR_COPY_INT;
			} else {
				return IR_COPY_FP;
			}
			break;
		case IR_PHI:
		case IR_PI:
		case IR_PARAM:
			return IR_SKIP_REG;

		case IR_CALL:
			ctx->flags |= IR_HAS_CALLS;
			return IR_CALL;

		case IR_VAR:
			if (ctx->use_lists[ref].count > 0) {
				return IR_VAR;
			} else {
				return IR_SKIP;
			}
			break;
		case IR_ALLOCA:
			ctx->flags |= IR_USE_FRAME_POINTER;
			return IR_ALLOCA;
		case IR_VLOAD:
			if (IR_IS_TYPE_INT(insn->type)) {
				return IR_VLOAD_INT;
			} else {
				return IR_VLOAD_FP;
			}
			break;
		case IR_VSTORE:
			if (IR_IS_TYPE_INT(ctx->ir_base[insn->op3].type)) {
				return IR_VSTORE_INT;
			} else {
				return IR_VSTORE_FP;
			}
			break;
		case IR_LOAD:
			if (IR_IS_TYPE_INT(ctx->ir_base[insn->op3].type)) {
				return IR_LOAD_INT;
			} else {
				return IR_LOAD_FP;
			}
			break;
		case IR_STORE:
			if (IR_IS_TYPE_INT(ctx->ir_base[insn->op3].type)) {
				return IR_STORE_INT;
			} else {
				return IR_STORE_FP;
			}
			break;
		case IR_START:
		case IR_BEGIN:
//		case IR_END:
		case IR_IF_TRUE:
		case IR_IF_FALSE:
		case IR_CASE_VAL:
		case IR_CASE_DEFAULT:
		case IR_MERGE:
		case IR_LOOP_BEGIN:
//		case IR_LOOP_END:
		case IR_LOOP_EXIT:
		case IR_UNREACHABLE:
			return IR_SKIP;
		case IR_RETURN:
			if (!insn->op2) {
				return IR_RETURN_VOID;
			} else if (IR_IS_TYPE_INT(ctx->ir_base[insn->op2].type)) {
				return IR_RETURN_INT;
			} else {
				return IR_RETURN_FP;
			}
		case IR_IF:
			if (insn->op2 > bb->start && insn->op2 < ref && ctx->use_lists[insn->op2].count == 1) {
				op2_insn = &ctx->ir_base[insn->op2];
				if (op2_insn->op >= IR_EQ && op2_insn->op <= IR_UGT) {
					ctx->rules[insn->op2] = IR_SKIP;
					if (IR_IS_TYPE_INT(ctx->ir_base[op2_insn->op1].type)) {
						return IR_CMP_AND_BRANCH_INT;
					} else {
						return IR_CMP_AND_BRANCH_FP;
					}
				} else if (op2_insn->op == IR_OVERFLOW) {
					ctx->rules[insn->op2] = IR_SKIP;
					return IR_OVERFLOW_AND_BRANCH;
				}
			}
			if (IR_IS_TYPE_INT(ctx->ir_base[insn->op2].type)) {
				return IR_IF_INT;
			} else {
				IR_ASSERT(0 && "NIY IR_IF_FP");
			}
		default:
			break;
	}

	return insn->op;
}

int ir_match(ir_ctx *ctx)
{
	int b, n;
	ir_ref i;
	ir_block *bb;
	ir_insn *insn;

	if (!ctx->prev_insn_len) {
		ctx->prev_insn_len = ir_mem_malloc(ctx->insns_count * sizeof(uint32_t));
		n = 1;
		for (b = 1, bb = ctx->cfg_blocks + b; b <= ctx->cfg_blocks_count; b++, bb++) {
			for (i = bb->start, insn = ctx->ir_base + i; i <= bb->end;) {
				ctx->prev_insn_len[i] = n;
				n = ir_operands_count(ctx, insn);
				n = 1 + (n >> 2); // support for multi-word instructions like MERGE and PHI
				i += n;
				insn += n;
			}
		}
	}

	ctx->rules = ir_mem_calloc(ctx->insns_count, sizeof(uint32_t));
	for (b = ctx->cfg_blocks_count, bb = ctx->cfg_blocks + b; b > 0; b--, bb--) {
		for (i = bb->end; i >= bb->start; i -= ctx->prev_insn_len[i]) {
			insn = &ctx->ir_base[i];
			if (!ctx->rules[i]) {
//			if (ctx->rules[i] != IR_SKIP) {
				ctx->rules[i] = ir_match_insn(ctx, i, bb);
			}
		}
	}

	return 1;
}

/* code genertion */
static int ir_skip_empty_blocks(ir_ctx *ctx, int b)
{
	while (ctx->cfg_blocks[b].flags & IR_BB_MAY_SKIP) {
		b++;
	}
	return b;
}

static ir_reg ir_ref_spill_slot(ir_ctx *ctx, ir_ref ref)
{
	ir_backend_data *data = ctx->data;
	int32_t offset;

	IR_ASSERT(ref >= 0);
	offset = ctx->live_intervals[ctx->vregs[ref]]->stack_spill_pos;
	IR_ASSERT(offset != -1);
	return IR_SPILL_POS_TO_OFFSET(offset);
}

static void ir_emit_load_imm_int(ir_ctx *ctx, ir_type type, ir_reg reg, int64_t val)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	IR_ASSERT(IR_IS_TYPE_INT(type));
	if (ir_type_size[type] == 8) {
		if (val == 0) {
			|	mov Rx(reg), xzr
		} else if (((uint64_t)(val)) <= 0xffff) {
			|	movz Rx(reg), #((uint64_t)(val))
		} else if (~((uint64_t)(val)) <= 0xffff) {
			|	movn Rx(reg), #(~((uint64_t)(val)))
		} else if ((uint64_t)(val) & 0xffff) {
			|	movz Rx(reg), #((uint64_t)(val) & 0xffff)
			if (((uint64_t)(val) >> 16) & 0xffff) {
				|	movk Rx(reg), #(((uint64_t)(val) >> 16) & 0xffff), lsl #16
			}
			if (((uint64_t)(val) >> 32) & 0xffff) {
				|	movk Rx(reg), #(((uint64_t)(val) >> 32) & 0xffff), lsl #32
			}
			if ((((uint64_t)(val) >> 48) & 0xffff)) {
				|	movk Rx(reg), #(((uint64_t)(val) >> 48) & 0xffff), lsl #48
			}
		} else if (((uint64_t)(val) >> 16) & 0xffff) {
			|	movz Rx(reg), #(((uint64_t)(val) >> 16) & 0xffff), lsl #16
			if (((uint64_t)(val) >> 32) & 0xffff) {
				|	movk Rx(reg), #(((uint64_t)(val) >> 32) & 0xffff), lsl #32
			}
			if ((((uint64_t)(val) >> 48) & 0xffff)) {
				|	movk Rx(reg), #(((uint64_t)(val) >> 48) & 0xffff), lsl #48
			}
		} else if (((uint64_t)(val) >> 32) & 0xffff) {
				|	movz Rx(reg), #(((uint64_t)(val) >> 32) & 0xffff), lsl #32
			if ((((uint64_t)(val) >> 48) & 0xffff)) {
				|	movk Rx(reg), #(((uint64_t)(val) >> 48) & 0xffff), lsl #48
			}
		} else {
			|	movz Rx(reg), #(((uint64_t)(val) >> 48) & 0xffff), lsl #48
		}
	} else {
		if (val == 0) {
			|	mov Rw(reg), wzr
		} else if (((uint64_t)(val)) <= 0xffff) {
			|	movz Rw(reg), #((uint64_t)(val))
		} else if (~((uint64_t)(val)) <= 0xffff) {
			|	movn Rw(reg), #(~((uint64_t)(val)))
		} else if ((uint64_t)(val) & 0xffff) {
			|	movz Rw(reg), #((uint64_t)(val) & 0xffff)
			if (((uint64_t)(val) >> 16) & 0xffff) {
				|	movk Rw(reg), #(((uint64_t)(val) >> 16) & 0xffff), lsl #16
			}
		} else if (((uint64_t)(val) >> 16) & 0xffff) {
			|	movz Rw(reg), #(((uint64_t)(val) >> 16) & 0xffff), lsl #16
		}
	}
}

static void ir_emit_load_mem_int(ir_ctx *ctx, ir_type type, ir_reg reg, ir_reg base_reg, int32_t offset)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	if (aarch64_may_encode_addr_offset(offset, ir_type_size[type])) {
		switch (ir_type_size[type]) {
			case 8:
				|	ldr Rx(reg), [Rx(base_reg), #offset]
				break;
			case 4:
				if (IR_IS_TYPE_SIGNED(type)) {
					|	ldrsw Rx(reg), [Rx(base_reg), #offset]
				} else {
					|	ldr Rw(reg), [Rx(base_reg), #offset]
			   	}
				break;
			case 2:
				if (IR_IS_TYPE_SIGNED(type)) {
					|	ldrsh Rx(reg), [Rx(base_reg), #offset]
				} else {
					|	ldrh Rw(reg), [Rx(base_reg), #offset]
				}
				break;
			case 1:
				if (IR_IS_TYPE_SIGNED(type)) {
					|	ldrsb Rx(reg), [Rx(base_reg), #offset]
				} else {
					|	ldrb Rw(reg), [Rx(base_reg), #offset]
				}
				break;
			default:
				IR_ASSERT(0);
		}
	} else {
		ir_emit_load_imm_int(ctx, IR_ADDR, reg, offset);
		switch (ir_type_size[type]) {
			case 8:
				|	ldr Rx(reg), [Rx(base_reg), Rx(reg)]
				break;
			case 4:
				if (IR_IS_TYPE_SIGNED(type)) {
					|	ldrsw Rx(reg), [Rx(base_reg), Rx(reg)]
				} else {
					|	ldr Rw(reg), [Rx(base_reg), Rx(reg)]
			   	}
				break;
			case 2:
				if (IR_IS_TYPE_SIGNED(type)) {
					|	ldrsh Rx(reg), [Rx(base_reg), Rx(reg)]
				} else {
					|	ldrh Rw(reg), [Rx(base_reg), Rx(reg)]
				}
				break;
			case 1:
				if (IR_IS_TYPE_SIGNED(type)) {
					|	ldrsb Rx(reg), [Rx(base_reg), Rx(reg)]
				} else {
					|	ldrb Rw(reg), [Rx(base_reg), Rx(reg)]
				}
				break;
			default:
				IR_ASSERT(0);
		}		 
	} 
}

static void ir_emit_load_imm_fp(ir_ctx *ctx, ir_type type, ir_reg reg, ir_ref src)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_insn *insn = &ctx->ir_base[src];
	int label;

	if (type == IR_FLOAT && insn->val.f == 0) {
		|	fmov Rs(reg-IR_REG_FP_FIRST), wzr
	} else if (type == IR_DOUBLE && insn->val.d == 0) {
		|	fmov Rd(reg-IR_REG_FP_FIRST), xzr
	} else {
		label = ctx->cfg_blocks_count - src;
		insn->emit_const = 1;
		if (type == IR_DOUBLE) {
			|	ldr Rd(reg-IR_REG_FP_FIRST), =>label
		} else {
			IR_ASSERT(type == IR_FLOAT);
			|	ldr Rs(reg-IR_REG_FP_FIRST), =>label
		}
	}
}

static void ir_emit_load_mem_fp(ir_ctx *ctx, ir_type type, ir_reg reg, ir_reg base_reg, int32_t offset)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	if (aarch64_may_encode_addr_offset(offset, ir_type_size[type])) {
		if (type == IR_DOUBLE) {
			|	ldr Rd(reg-IR_REG_FP_FIRST), [Rx(base_reg), #offset]
		} else {
			IR_ASSERT(type == IR_FLOAT);
			|	ldr Rs(reg-IR_REG_FP_FIRST), [Rx(base_reg), #offset]
		}
	} else {
		ir_reg tmp_reg = IR_REG_INT_TMP; /* reserved temporary register */

		ir_emit_load_imm_int(ctx, IR_ADDR, tmp_reg, offset);
		if (type == IR_DOUBLE) {
			|	ldr Rd(reg-IR_REG_FP_FIRST), [Rx(base_reg), Rx(tmp_reg)]
		} else {
			IR_ASSERT(type == IR_FLOAT);
			|	ldr Rs(reg-IR_REG_FP_FIRST), [Rx(base_reg), Rx(tmp_reg)]
		}
	}
}

static void ir_emit_load(ir_ctx *ctx, ir_type type, ir_reg reg, ir_ref src)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	int32_t offset;
	ir_reg fp;

	if (IR_IS_CONST_REF(src)) {
		if (IR_IS_TYPE_INT(type)) {
			ir_insn *insn = &ctx->ir_base[src];

			IR_ASSERT(insn->op != IR_STR);
			ir_emit_load_imm_int(ctx, type, reg, insn->val.i64);
		} else {
			ir_emit_load_imm_fp(ctx, type, reg, src);
		}
	} else {
		offset = ctx->live_intervals[ctx->vregs[src]]->stack_spill_pos;
		IR_ASSERT(offset != -1);
		offset = IR_SPILL_POS_TO_OFFSET(offset);
		fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
		if (IR_IS_TYPE_INT(type)) {
			ir_emit_load_mem_int(ctx, type, reg, fp, offset);
		} else {
			ir_emit_load_mem_fp(ctx, type, reg, fp, offset);
		}
	}
}

static void ir_emit_store_mem_int(ir_ctx *ctx, ir_type type, ir_reg base_reg, int32_t offset, ir_reg reg)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	if (aarch64_may_encode_addr_offset(offset, ir_type_size[type])) {
		switch (ir_type_size[type]) {
			case 8:
				|	str Rx(reg), [Rx(base_reg), #offset]
				break;
			case 4:
				|	str Rw(reg), [Rx(base_reg), #offset]
				break;
			case 2:
				|	strh Rw(reg), [Rx(base_reg), #offset]
				break;
			case 1:
				|	strb Rw(reg), [Rx(base_reg), #offset]
				break;
			default:
				IR_ASSERT(0);
		}
	} else {
		ir_emit_load_imm_int(ctx, IR_ADDR, reg, offset);
		switch (ir_type_size[type]) {
			case 8:
				|	str Rx(reg), [Rx(base_reg), Rx(reg)]
				break;
			case 4:
				|	str Rw(reg), [Rx(base_reg), Rx(reg)]
				break;
			case 2:
				|	strh Rw(reg), [Rx(base_reg), Rx(reg)]
				break;
			case 1:
				|	strb Rw(reg), [Rx(base_reg), Rx(reg)]
				break;
			default:
				IR_ASSERT(0);
		}
	}
}

static void ir_emit_store_mem_fp(ir_ctx *ctx, ir_type type, ir_reg base_reg, int32_t offset, ir_reg reg)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	if (aarch64_may_encode_addr_offset(offset, ir_type_size[type])) {
		if (type == IR_DOUBLE) {
			|	str Rd(reg-IR_REG_FP_FIRST), [Rx(base_reg), #offset]
		} else {
			IR_ASSERT(type == IR_FLOAT);
			|	str Rs(reg-IR_REG_FP_FIRST), [Rx(base_reg), #offset]
		}
	} else {
		ir_reg tmp_reg = IR_REG_INT_TMP; /* reserved temporary register */

		ir_emit_load_imm_int(ctx, IR_ADDR, tmp_reg, offset);
		if (type == IR_DOUBLE) {
			|	str Rd(reg-IR_REG_FP_FIRST), [Rx(base_reg), Rx(tmp_reg)]
		} else {
			IR_ASSERT(type == IR_FLOAT);
			|	str Rs(reg-IR_REG_FP_FIRST), [Rx(base_reg), Rx(tmp_reg)]
		}
	}
}

static void ir_emit_store(ir_ctx *ctx, ir_type type, ir_ref dst, ir_reg reg)
{
	ir_backend_data *data = ctx->data;
	int32_t offset;
	ir_reg fp;

	IR_ASSERT(dst >= 0);
	offset = ctx->live_intervals[ctx->vregs[dst]]->stack_spill_pos;
	IR_ASSERT(offset != -1);
	offset = IR_SPILL_POS_TO_OFFSET(offset);
	fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;

	if (IR_IS_TYPE_INT(type)) {
		ir_emit_store_mem_int(ctx, type, fp, offset, reg);
	} else {
		ir_emit_store_mem_fp(ctx, type, fp, offset, reg);
	}
}

static bool ir_is_same_mem(ir_ctx *ctx, ir_ref r1, ir_ref r2)
{
	ir_live_interval *ival1, *ival2;
	int32_t o1, o2;

	if (IR_IS_CONST_REF(r1) || IR_IS_CONST_REF(r2)) {
		return 0;
	}

	IR_ASSERT(ctx->vregs[r1] && ctx->vregs[r2]);
	ival1 = ctx->live_intervals[ctx->vregs[r1]];
	ival2 = ctx->live_intervals[ctx->vregs[r2]];
	IR_ASSERT(ival1 && ival2);
	o1 = ival1->stack_spill_pos;
	o2 = ival2->stack_spill_pos;
	IR_ASSERT(o1 != -1 && o2 != -1);
	return o1 == o2;
}

static void ir_emit_mov(ir_ctx *ctx, ir_type type, ir_reg dst, ir_reg src)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	if (ir_type_size[type] == 8) {
		|	mov Rx(dst), Rx(src)
	} else {
		|	mov Rw(dst), Rw(src)
	}
}

static void ir_emit_fp_mov(ir_ctx *ctx, ir_type type, ir_reg dst, ir_reg src)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	if (ir_type_size[type] == 8) {
		|	fmov Rd(dst-IR_REG_FP_FIRST), Rd(src-IR_REG_FP_FIRST)
	} else {
		|	fmov Rs(dst-IR_REG_FP_FIRST), Rs(src-IR_REG_FP_FIRST)
	}
}

static void ir_emit_prologue(ir_ctx *ctx)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	if (ctx->flags & IR_USE_FRAME_POINTER) {
		|	stp x29, x30, [sp, # (-(data->ra_data.stack_frame_size+16))]!
		|	mov x29, sp
		if (data->call_stack_size) {
			| sub sp, sp, #(data->call_stack_size)
		}
	} else if (data->ra_data.stack_frame_size + data->call_stack_size) {
		| sub sp, sp, #(data->ra_data.stack_frame_size + data->call_stack_size)
	}
	if (data->used_preserved_regs) {
		int offset;
		uint32_t i;

		if (ctx->flags & IR_USE_FRAME_POINTER) {
			offset = 0;
		} else {
			offset = data->ra_data.stack_frame_size + data->call_stack_size;
		}
		for (i = 0; i < IR_REG_NUM; i++) {
			if (IR_REGSET_IN(data->used_preserved_regs, i)) {
				if (i < IR_REG_FP_FIRST) {
					ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;

					offset -= sizeof(void*);
//???					|	mov aword [Ra(fp)+offset], Ra(i)
				} else {
					IR_ASSERT(0 && "NIY FP register saing");
				}
			}
		}
	}
}

static void ir_emit_epilogue(ir_ctx *ctx)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	if (data->used_preserved_regs) {
		int offset;
		uint32_t i;

		if (ctx->flags & IR_USE_FRAME_POINTER) {
			offset = 0;
		} else {
			offset = data->ra_data.stack_frame_size + data->call_stack_size;
		}
		for (i = 0; i < IR_REG_NUM; i++) {
			if (IR_REGSET_IN(data->used_preserved_regs, i)) {
				if (i < IR_REG_FP_FIRST) {
					ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;

					offset -= sizeof(void*);
//???					|	mov Ra(i), aword [Ra(fp)+offset]
				} else {
					IR_ASSERT(0 && "NIY FP register saing");
				}
			}
		}
	}

	if (ctx->flags & IR_USE_FRAME_POINTER) {
		if (data->call_stack_size) {
			| add sp, sp, #(data->call_stack_size)
		}
		|	ldp x29, x30, [sp], # (data->ra_data.stack_frame_size+16)
	} else if (data->ra_data.stack_frame_size + data->call_stack_size) {
		| add sp, sp, #(data->ra_data.stack_frame_size + data->call_stack_size)
	}
}

static void ir_emit_binop_int(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type = insn->type;
	ir_ref op1 = insn->op1;
	ir_ref op2 = insn->op2;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];
	ir_reg op2_reg = ctx->regs[def][2];
	ir_reg tmp_reg;

	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE);

	if ((op1_reg & IR_REG_SPILL_LOAD)  || IR_IS_CONST_REF(op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if (op2_reg != IR_REG_NONE) {
		if ((op2_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op2)) {
			op2_reg &= ~IR_REG_SPILL_LOAD;
			if (op1 != op2) {
				ir_emit_load(ctx, type, op2_reg, op2);
			}
		}
		switch (insn->op) {
			case IR_ADD:
				|	ASM_REG_REG_REG_OP add, type, def_reg, op1_reg, op2_reg
				break;
			case IR_ADD_OV:
				|	ASM_REG_REG_REG_OP adds, type, def_reg, op1_reg, op2_reg
				break;
			case IR_SUB:
				|	ASM_REG_REG_REG_OP sub, type, def_reg, op1_reg, op2_reg
				break;
			case IR_SUB_OV:
				|	ASM_REG_REG_REG_OP subs, type, def_reg, op1_reg, op2_reg
				break;
			case IR_MUL:
				|	ASM_REG_REG_REG_OP mul, type, def_reg, op1_reg, op2_reg
				break;
//???			case IR_MUL_OV:
//???				|	ASM_REG_REG_IMUL type, def_reg, op2_reg
//???				break;
			case IR_DIV:
				if (IR_IS_TYPE_SIGNED(type)) {
					|	ASM_REG_REG_REG_OP sdiv, type, def_reg, op1_reg, op2_reg
				} else {
					|	ASM_REG_REG_REG_OP udiv, type, def_reg, op1_reg, op2_reg
				}
				break;
			case IR_MOD:
				tmp_reg = ctx->regs[def][3];
				IR_ASSERT(tmp_reg != IR_REG_NONE);
				if (IR_IS_TYPE_SIGNED(type)) {
					|	ASM_REG_REG_REG_OP sdiv, type, tmp_reg, op1_reg, op2_reg
					|	ASM_REG_REG_REG_REG_OP msub, type, def_reg, tmp_reg, op2_reg, op1_reg
				} else {
					|	ASM_REG_REG_REG_OP udiv, type, tmp_reg, op1_reg, op2_reg
					|	ASM_REG_REG_REG_REG_OP msub, type, def_reg, tmp_reg, op2_reg, op1_reg
				}
				break;
			case IR_OR:
				|	ASM_REG_REG_REG_OP orr, type, def_reg, op1_reg, op2_reg
				break;
			case IR_AND:
				|	ASM_REG_REG_REG_OP and, type, def_reg, op1_reg, op2_reg
				break;
			case IR_XOR:
				|	ASM_REG_REG_REG_OP eor, type, def_reg, op1_reg, op2_reg
				break;
			default:
				IR_ASSERT(0 && "NIY binary op");
				break;
		}
	} else {
		IR_ASSERT(IR_IS_CONST_REF(op2));
		int32_t val = ctx->ir_base[op2].val.i32;
		switch (insn->op) {
			case IR_ADD:
				|	ASM_REG_REG_IMM_OP add, type, def_reg, op1_reg, val
				break;
			case IR_ADD_OV:
				|	ASM_REG_REG_IMM_OP adds, type, def_reg, op1_reg, val
				break;
			case IR_SUB:
				|	ASM_REG_REG_IMM_OP sub, type, def_reg, op1_reg, val
				break;
			case IR_SUB_OV:
				|	ASM_REG_REG_IMM_OP subs, type, def_reg, op1_reg, val
				break;
			case IR_OR:
				|	ASM_REG_REG_IMM_OP orr, type, def_reg, op1_reg, val
				break;
			case IR_AND:
				|	ASM_REG_REG_IMM_OP and, type, def_reg, op1_reg, val
				break;
			case IR_XOR:
				|	ASM_REG_REG_IMM_OP eor, type, def_reg, op1_reg, val
				break;
			default:
				IR_ASSERT(0 && "NIY binary op");
				break;
		}
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_min_max_int(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type = insn->type;
	ir_ref op1 = insn->op1;
	ir_ref op2 = insn->op2;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];
	ir_reg op2_reg = ctx->regs[def][2];

	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE && op2_reg != IR_REG_NONE);

	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if ((op2_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op2)) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op2_reg, op2);
	}

	if (op1 == op2) {
		return;
	}

	if (ir_type_size[type] == 8) {
		|	cmp Rx(op1_reg), Rx(op2_reg)
		if (insn->op == IR_MIN) {
			if (IR_IS_TYPE_SIGNED(type)) {
				|	csel Rx(def_reg), Rx(op1_reg), Rx(op2_reg), le
			} else {
				|	csel Rx(def_reg), Rx(op1_reg), Rx(op2_reg), ls
			}
		} else {
			IR_ASSERT(insn->op == IR_MAX);
			if (IR_IS_TYPE_SIGNED(type)) {
				|	csel Rx(def_reg), Rx(op1_reg), Rx(op2_reg), ge
			} else {
				|	csel Rx(def_reg), Rx(op1_reg), Rx(op2_reg), hs
			}
		}
	} else {
		|	cmp Rw(op1_reg), Rw(op2_reg)
		if (insn->op == IR_MIN) {
			if (IR_IS_TYPE_SIGNED(type)) {
				|	csel Rw(def_reg), Rw(op1_reg), Rw(op2_reg), le
			} else {
				|	csel Rw(def_reg), Rw(op1_reg), Rw(op2_reg), ls
			}
		} else {
			IR_ASSERT(insn->op == IR_MAX);
			if (IR_IS_TYPE_SIGNED(type)) {
				|	csel Rw(def_reg), Rw(op1_reg), Rw(op2_reg), ge
			} else {
				|	csel Rw(def_reg), Rw(op1_reg), Rw(op2_reg), hs
			}
		}
	}

	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_overflow(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_type type = ctx->ir_base[insn->op1].type;

	IR_ASSERT(def_reg != IR_REG_NONE);
	IR_ASSERT(IR_IS_TYPE_INT(type));
	if (IR_IS_TYPE_SIGNED(type)) {
		|	cset Rw(def_reg), vs
	} else {
		|	cset Rw(def_reg), cs
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, insn->type, def, def_reg);
	}
}

static void ir_emit_overflow_and_branch(ir_ctx *ctx, int b, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_insn *overflow_insn = &ctx->ir_base[insn->op2];
	ir_type type = ctx->ir_base[overflow_insn->op1].type;
	ir_block *bb;
	uint32_t n, *p, use_block;
	ir_insn *use_insn;
	int true_block = 0, false_block = 0, next_block;
	bool reverse = 0;

	bb = &ctx->cfg_blocks[b];
	p = &ctx->cfg_edges[bb->successors];
	for (n = bb->successors_count; n != 0; p++, n--) {
		use_block = *p;
		use_insn = &ctx->ir_base[ctx->cfg_blocks[use_block].start];
		if (use_insn->op == IR_IF_TRUE) {
			true_block = ir_skip_empty_blocks(ctx, use_block);
		} else if (use_insn->op == IR_IF_FALSE) {
			false_block = ir_skip_empty_blocks(ctx, use_block);
		} else {
			IR_ASSERT(0);
		}
	}
	IR_ASSERT(true_block && false_block);

	next_block = b == ctx->cfg_blocks_count ? 0 : ir_skip_empty_blocks(ctx, b + 1);
	if (true_block == next_block) {
		reverse = 1;
		true_block = false_block;
		false_block = 0;
	} else if (false_block == next_block) {
		false_block = 0;
	}

	if (IR_IS_TYPE_SIGNED(type)) {
		if (reverse) {
			|	bvc =>true_block
		} else {
			|	bvs =>true_block
		}
	} else {
		if (reverse) {
			|	bcc =>true_block
		} else {
			|	bcs =>true_block
		}
	}
	if (false_block) {
		|	b =>false_block
	}
}

static void ir_emit_mul_div_mod_pwr2(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type = insn->type;
	ir_ref op1 = insn->op1;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE);

	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if (insn->op == IR_MUL) {
		uint32_t shift = IR_LOG2(ctx->ir_base[insn->op2].val.u64);
		if (shift == 1) {
			|	ASM_REG_REG_REG_OP add, insn->type, def_reg, op1_reg, op1_reg
		} else {
			|	ASM_REG_REG_IMM_OP lsl, insn->type, def_reg, op1_reg, shift
		}
	} else if (insn->op == IR_DIV) {
		uint32_t shift = IR_LOG2(ctx->ir_base[insn->op2].val.u64);
		|	ASM_REG_REG_IMM_OP lsr, insn->type, def_reg, op1_reg, shift
	} else if (insn->op == IR_MOD) {
		uint64_t mask = ctx->ir_base[insn->op2].val.u64 - 1;
		|	ASM_REG_REG_IMM_OP and, insn->type, def_reg, op1_reg, mask
	} else {
		IR_ASSERT(0);
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_shift(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type = insn->type;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];
	ir_reg op2_reg = ctx->regs[def][2];
	ir_reg tmp_reg;

	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE && op2_reg != IR_REG_NONE);
	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(insn->op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, insn->op1);
	}
	if (op2_reg & IR_REG_SPILL_LOAD) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op2_reg, insn->op2);
	}
	switch (insn->op) {
		case IR_SHL:
			|	ASM_REG_REG_REG_OP lsl, type, def_reg, op1_reg, op2_reg
			break;
		case IR_SHR:
			|	ASM_REG_REG_REG_OP lsr, type, def_reg, op1_reg, op2_reg
			break;
		case IR_SAR:
			|	ASM_REG_REG_REG_OP asr, type, def_reg, op1_reg, op2_reg
			break;
		case IR_ROL:
			tmp_reg = ctx->regs[def][3];
			IR_ASSERT(tmp_reg != IR_REG_NONE);
			if (ir_type_size[type] == 8) {
				|	neg Rx(tmp_reg), Rx(op2_reg)
				|	ror Rx(def_reg), Rx(op1_reg), Rx(tmp_reg)
			} else {
				|	neg Rw(tmp_reg), Rw(op2_reg)
				|	ror Rw(def_reg), Rw(op1_reg), Rw(tmp_reg)
			}
			break;
		case IR_ROR:
			|	ASM_REG_REG_REG_OP ror, type, def_reg, op1_reg, op2_reg
			break;
		default:
			IR_ASSERT(0);
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_shift_const(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	uint32_t shift = ctx->ir_base[insn->op2].val.u64;
	ir_type type = insn->type;
	ir_ref op1 = insn->op1;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE);

	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	switch (insn->op) {
		case IR_SHL:
			|	ASM_REG_REG_IMM_OP lsl, type, def_reg, op1_reg, shift
			break;
		case IR_SHR:
			|	ASM_REG_REG_IMM_OP lsr, type, def_reg, op1_reg, shift
			break;
		case IR_SAR:
			|	ASM_REG_REG_IMM_OP asr, type, def_reg, op1_reg, shift
			break;
		case IR_ROL:
			if (ir_type_size[type] == 8) {
				shift = (64 - shift) % 64;
				|	ror Rx(def_reg), Rx(op1_reg), #shift
			} else {
				shift = (32 - shift) % 32;
				|	ror Rw(def_reg), Rw(op1_reg), #shift
			}
			break;
		case IR_ROR:
			|	ASM_REG_REG_IMM_OP ror, type, def_reg, op1_reg, shift
			break;
		default:
			IR_ASSERT(0);
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_op_int(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type = insn->type;
	ir_ref op1 = insn->op1;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE);

	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if (insn->op == IR_NOT) {
		if (insn->type == IR_BOOL) {
			|	ASM_REG_IMM_OP cmp, type, op1, 0
			|	cset Rw(def_reg), eq
		} else {
			|	ASM_REG_REG_OP mvn, insn->type, def_reg, op1_reg
		}
	} else if (insn->op == IR_NEG) {
		|	ASM_REG_REG_OP neg, insn->type, def_reg, op1_reg
	} else if (insn->op == IR_ABS) {
		if (ir_type_size[type] == 8) {
			|	cmp Rx(op1_reg), #0
			|	cneg Rx(def_reg), Rx(op1_reg), lt
		} else {
			|	cmp Rw(op1_reg), #0
			|	cneg Rw(def_reg), Rw(op1_reg), lt
		}
	} else if (insn->op == IR_BSWAP) {
		|	ASM_REG_REG_OP rev, insn->type, def_reg, op1_reg
	} else {
		IR_ASSERT(0);
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_op_fp(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type = insn->type;
	ir_ref op1 = insn->op1;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE);

	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if (insn->op == IR_NEG) {
		if (type == IR_DOUBLE) {
			|	fneg Rd(def_reg-IR_REG_FP_FIRST), Rd(op1_reg-IR_REG_FP_FIRST)
		} else {
			IR_ASSERT(type == IR_FLOAT);
			|	fneg Rs(def_reg-IR_REG_FP_FIRST), Rs(op1_reg-IR_REG_FP_FIRST)
		}
	} else if (insn->op == IR_ABS) {
		if (type == IR_DOUBLE) {
			|	fabs Rd(def_reg-IR_REG_FP_FIRST), Rd(op1_reg-IR_REG_FP_FIRST)
		} else {
			IR_ASSERT(type == IR_FLOAT);
			|	fabs Rs(def_reg-IR_REG_FP_FIRST), Rs(op1_reg-IR_REG_FP_FIRST)
		}
	} else {
		IR_ASSERT(0);
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, insn->type, def, def_reg);
	}
}

static void ir_emit_binop_fp(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type = insn->type;
	ir_ref op1 = insn->op1;
	ir_ref op2 = insn->op2;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];
	ir_reg op2_reg = ctx->regs[def][2];

	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE && op2_reg != IR_REG_NONE);
	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if ((op2_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op2)) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		if (op1 != op2) {
			ir_emit_load(ctx, type, op2_reg, op2);
		}
	}
	switch (insn->op) {
		case IR_ADD:
			|	ASM_FP_REG_REG_REG_OP fadd, type, def_reg, op1_reg, op2_reg
			break;
		case IR_SUB:
			|	ASM_FP_REG_REG_REG_OP fsub, type, def_reg, op1_reg, op2_reg
			break;
		case IR_MUL:
			|	ASM_FP_REG_REG_REG_OP fmul, type, def_reg, op1_reg, op2_reg
			break;
		case IR_DIV:
			|	ASM_FP_REG_REG_REG_OP fdiv, type, def_reg, op1_reg, op2_reg
			break;
		case IR_MIN:
			|	ASM_FP_REG_REG_REG_OP fmin, type, def_reg, op1_reg, op2_reg
			break;
		case IR_MAX:
			|	ASM_FP_REG_REG_REG_OP fmax, type, def_reg, op1_reg, op2_reg
			break;
		default:
			IR_ASSERT(0 && "NIY binary op");
			break;
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, insn->type, def, def_reg);
	}
}

static void ir_emit_cmp_int_common(ir_ctx *ctx, ir_type type, ir_reg op1_reg, ir_ref op1, ir_reg op2_reg, ir_ref op2)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	IR_ASSERT(op1_reg != IR_REG_NONE);
	if (op2_reg != IR_REG_NONE) {
		if (ir_type_size[type] == 8) {
			|	cmp Rx(op1_reg), Rx(op2_reg)
		} else {
			|	cmp Rw(op1_reg), Rw(op2_reg)
		}
	} else {
		IR_ASSERT(IR_IS_CONST_REF(op2));
		int32_t val = ctx->ir_base[op2].val.i32;

		if (ir_type_size[type] == 8) {
			|	cmp Rx(op1_reg), #val
		} else {
			|	cmp Rw(op1_reg), #val
		}
	}
}

static void ir_emit_cmp_int(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type = ctx->ir_base[insn->op1].type;
	ir_op op = insn->op;
	ir_ref op1 = insn->op1;
	ir_ref op2 = insn->op2;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];
	ir_reg op2_reg = ctx->regs[def][2];

	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE);
	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if (op2_reg != IR_REG_NONE) {
		if (op2_reg & IR_REG_SPILL_LOAD) {
			op2_reg &= ~IR_REG_SPILL_LOAD;
			if (op1 != op2) {
				ir_emit_load(ctx, type, op2_reg, op2);
			}
		}
		if (IR_IS_CONST_REF(op2)) {
			ir_emit_load(ctx, type, op2_reg, op2);
		}
	}
	if (IR_IS_CONST_REF(insn->op2) && ctx->ir_base[insn->op2].val.u64 == 0) {
		if (op == IR_ULT) {
			/* always false */
			ir_emit_load_imm_int(ctx, IR_BOOL, def_reg, 0);
			if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
				ir_emit_store(ctx, insn->type, def, def_reg);
			}
			return;
		} else if (op == IR_UGE) {
			/* always true */
			ir_emit_load_imm_int(ctx, IR_BOOL, def_reg, 1);
			if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
				ir_emit_store(ctx, insn->type, def, def_reg);
			}
			return;
		} else if (op == IR_ULE) {
			op = IR_EQ;
		} else if (op == IR_UGT) {
			op = IR_NE;
		}
	}
	ir_emit_cmp_int_common(ctx, type, op1_reg, op1, op2_reg, op2);
	switch (op) {
		case IR_EQ:
			|	cset Rw(def_reg), eq
			break;
		case IR_NE:
			|	cset Rw(def_reg), ne
			break;
		case IR_LT:
			|	cset Rw(def_reg), lt
			break;
		case IR_GE:
			|	cset Rw(def_reg), ge
			break;
		case IR_LE:
			|	cset Rw(def_reg), le
			break;
		case IR_GT:
			|	cset Rw(def_reg), gt
			break;
		case IR_ULT:
			|	cset Rw(def_reg), lo
			break;
		case IR_UGE:
			|	cset Rw(def_reg), hs
			break;
		case IR_ULE:
			|	cset Rw(def_reg), ls
			break;
		case IR_UGT:
			|	cset Rw(def_reg), hi
			break;
		default:
			IR_ASSERT(0 && "NIY binary op");
			break;
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, insn->type, def, def_reg);
	}
}

static ir_op ir_emit_cmp_fp_common(ir_ctx *ctx, ir_ref cmp_ref, ir_insn *cmp_insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type = ctx->ir_base[cmp_insn->op1].type;
	ir_op op = cmp_insn->op;
	ir_ref op1, op2;
	ir_reg op1_reg, op2_reg;

	if (op == IR_LT || op == IR_LE) {
		/* swap operands to avoid P flag check */
		op ^= 3;
		op1 = cmp_insn->op2;
		op2 = cmp_insn->op1;
		op1_reg = ctx->regs[cmp_ref][2];
		op2_reg = ctx->regs[cmp_ref][1];
	} else {
		op1 = cmp_insn->op1;
		op2 = cmp_insn->op2;
		op1_reg = ctx->regs[cmp_ref][1];
		op2_reg = ctx->regs[cmp_ref][2];
	}

	IR_ASSERT(op1_reg != IR_REG_NONE && op2_reg != IR_REG_NONE);
	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if ((op2_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(op2)) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		if (op1 != op2) {
			ir_emit_load(ctx, type, op2_reg, op2);
		}
	}
	if (type == IR_DOUBLE) {
		|	fcmp Rd(op1_reg-IR_REG_FP_FIRST), Rd(op2_reg-IR_REG_FP_FIRST)
	} else {
		IR_ASSERT(type == IR_FLOAT);
		|	fcmp Rs(op1_reg-IR_REG_FP_FIRST), Rs(op2_reg-IR_REG_FP_FIRST)
	}
	return op;
}

static void ir_emit_cmp_fp(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_op op = ir_emit_cmp_fp_common(ctx, def, insn);
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg tmp_reg = ctx->regs[def][3];

	IR_ASSERT(def_reg != IR_REG_NONE);
	// TODO: take into accouny vs flag //???
	switch (op) {
		case IR_EQ:
			|	cset Rw(def_reg), eq
			break;
		case IR_NE:
			|	cset Rw(def_reg), ne
			break;
		case IR_LT:
			|	cset Rw(def_reg), lo
			break;
		case IR_GE:
			|	cset Rw(def_reg), hs
			break;
		case IR_LE:
			|	cset Rw(def_reg), ls
			break;
		case IR_GT:
			|	cset Rw(def_reg), hi
			break;
		default:
			IR_ASSERT(0 && "NIY binary op");
			break;
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, insn->type, def, def_reg);
	}
}

static void ir_emit_jmp_true(ir_ctx *ctx, int b, ir_ref def)
{
	ir_block *bb;
	ir_insn *use_insn;
	uint32_t n, *p, use_block;
	int true_block = 0, false_block = 0;
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	bb = &ctx->cfg_blocks[b];
	p = &ctx->cfg_edges[bb->successors];
	for (n = bb->successors_count; n != 0; p++, n--) {
		use_block = *p;
		use_insn = &ctx->ir_base[ctx->cfg_blocks[use_block].start];
		if (use_insn->op == IR_IF_TRUE) {
			true_block = ir_skip_empty_blocks(ctx, use_block);
		} else if (use_insn->op == IR_IF_FALSE) {
			false_block = ir_skip_empty_blocks(ctx, use_block);
		} else {
			IR_ASSERT(0);
		}
	}
	IR_ASSERT(true_block && false_block);

	if (b == ctx->cfg_blocks_count || true_block != ir_skip_empty_blocks(ctx, b + 1)) {
		|	b =>true_block
	}
}

static void ir_emit_jmp_false(ir_ctx *ctx, int b, ir_ref def)
{
	ir_block *bb;
	ir_insn *use_insn;
	uint32_t n, *p, use_block;
	int true_block = 0, false_block = 0;
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	bb = &ctx->cfg_blocks[b];
	p = &ctx->cfg_edges[bb->successors];
	for (n = bb->successors_count; n != 0; p++, n--) {
		use_block = *p;
		use_insn = &ctx->ir_base[ctx->cfg_blocks[use_block].start];
		if (use_insn->op == IR_IF_TRUE) {
			true_block = ir_skip_empty_blocks(ctx, use_block);
		} else if (use_insn->op == IR_IF_FALSE) {
			false_block = ir_skip_empty_blocks(ctx, use_block);
		} else {
			IR_ASSERT(0);
		}
	}
	IR_ASSERT(true_block && false_block);

	if (b == ctx->cfg_blocks_count || true_block != ir_skip_empty_blocks(ctx, b + 1)) {
		|	b =>false_block
	}
}

static void ir_emit_jcc(ir_ctx *ctx, uint8_t op, int b, ir_ref def, ir_insn *insn, bool int_cmp)
{
	ir_block *bb;
	ir_insn *use_insn;
	uint32_t n, *p, use_block;
	int true_block = 0, false_block = 0, next_block;
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	bb = &ctx->cfg_blocks[b];
	p = &ctx->cfg_edges[bb->successors];
	for (n = bb->successors_count; n != 0; p++, n--) {
		use_block = *p;
		use_insn = &ctx->ir_base[ctx->cfg_blocks[use_block].start];
		if (use_insn->op == IR_IF_TRUE) {
			true_block = ir_skip_empty_blocks(ctx, use_block);
		} else if (use_insn->op == IR_IF_FALSE) {
			false_block = ir_skip_empty_blocks(ctx, use_block);
		} else {
			IR_ASSERT(0);
		}
	}
	IR_ASSERT(true_block && false_block);

	next_block = b == ctx->cfg_blocks_count ? 0 : ir_skip_empty_blocks(ctx, b + 1);
	if (true_block == next_block) {
		if (int_cmp || (op != IR_GT && op != IR_GE)) {
			/* swap to avoid unconditional JMP if this doesn't introduce additional JP instruction */
			if (op < IR_LT) {
				op ^= 1; // reverse
			} else {
				op ^= 3; // reverse
			}
			true_block = false_block;
			false_block = 0;
		}
	} else if (false_block == next_block) {
		false_block = 0;
	}

	if (int_cmp) {
		switch (op) {
			case IR_EQ:
				|	beq =>true_block
				break;
			case IR_NE:
				|	bne =>true_block
				break;
			case IR_LT:
				|	blt =>true_block
				break;
			case IR_GE:
				|	bge =>true_block
				break;
			case IR_LE:
				|	ble =>true_block
				break;
			case IR_GT:
				|	bgt =>true_block
				break;
			case IR_ULT:
				|	blo =>true_block
				break;
			case IR_UGE:
				|	bhs =>true_block
				break;
			case IR_ULE:
				|	bls =>true_block
				break;
			case IR_UGT:
				|	bhi =>true_block
				break;
			default:
				IR_ASSERT(0 && "NIY binary op");
				break;
		}
	} else {
		switch (op) {
			case IR_EQ:
				if (!false_block) {
					|	bvs >1
					|	beq =>true_block
					|1:
				} else {
					|	bvs =>false_block
					|	beq =>true_block
				}
				break;
			case IR_NE:
				|	bne =>true_block
				|	bvs =>true_block
				break;
			case IR_LT:
				if (!false_block) {
					|	bvs >1
					|	blo =>true_block
					|1:
				} else {
					|	bvs =>false_block
					|	blo =>true_block
				}
				break;
			case IR_GE:
				|	bhs =>true_block
				break;
			case IR_LE:
				if (!false_block) {
					|	bvs >1
					|	bls =>true_block
					|1:
				} else {
					|	bvs =>false_block
					|	bls =>true_block
				}
				break;
			case IR_GT:
				|	bhi =>true_block
				break;
//			case IR_ULT: fprintf(stderr, "\tjb .LL%d\n", true_block); break;
//			case IR_UGE: fprintf(stderr, "\tjae .LL%d\n", true_block); break;
//			case IR_ULE: fprintf(stderr, "\tjbe .LL%d\n", true_block); break;
//			case IR_UGT: fprintf(stderr, "\tja .LL%d\n", true_block); break;
			default:
				IR_ASSERT(0 && "NIY binary op");
				break;
		}
	}
	if (false_block) {
		|	b =>false_block
	}
}

static void ir_emit_cmp_and_branch_int(ir_ctx *ctx, int b, ir_ref def, ir_insn *insn)
{
	ir_insn *cmp_insn = &ctx->ir_base[insn->op2];
	ir_op op = cmp_insn->op;
	ir_type type = ctx->ir_base[cmp_insn->op1].type;
	ir_ref op1 = cmp_insn->op1;
	ir_ref op2 = cmp_insn->op2;
	ir_reg op1_reg = ctx->regs[insn->op2][1];
	ir_reg op2_reg = ctx->regs[insn->op2][2];

	if (op1_reg != IR_REG_NONE && (op1_reg & IR_REG_SPILL_LOAD)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if (op1_reg != IR_REG_NONE && IR_IS_CONST_REF(op1)) {
		ir_emit_load(ctx, type, op1_reg, op1);
	}
	if (op2_reg != IR_REG_NONE) {
		if (op2_reg & IR_REG_SPILL_LOAD) {
			op2_reg &= ~IR_REG_SPILL_LOAD;
			if (op1 != op2) {
				ir_emit_load(ctx, type, op2_reg, op2);
			}
		}
		if (IR_IS_CONST_REF(op2)) {
			ir_emit_load(ctx, type, op2_reg, op2);
		}
	}
	if (IR_IS_CONST_REF(insn->op2) && ctx->ir_base[insn->op2].val.u64 == 0) {
		if (op == IR_ULT) {
			/* always false */
			ir_emit_jmp_false(ctx, b, def);
			return;
		} else if (op == IR_UGE) {
			/* always true */
			ir_emit_jmp_true(ctx, b, def);
			return;
		} else if (op == IR_ULE) {
			op = IR_EQ;
		} else if (op == IR_UGT) {
			op = IR_NE;
		}
	}
	ir_emit_cmp_int_common(ctx, type, op1_reg, op1, op2_reg, op2);
	ir_emit_jcc(ctx, op, b, def, insn, 1);
}

static void ir_emit_cmp_and_branch_fp(ir_ctx *ctx, int b, ir_ref def, ir_insn *insn)
{
	ir_op op = ir_emit_cmp_fp_common(ctx, insn->op2, &ctx->ir_base[insn->op2]);
	ir_emit_jcc(ctx, op, b, def, insn, 0);
}

static void ir_emit_if_int(ir_ctx *ctx, int b, ir_ref def, ir_insn *insn)
{
	ir_type type = ctx->ir_base[insn->op2].type;
	ir_reg op2_reg = ctx->regs[def][2];
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	IR_ASSERT(op2_reg != IR_REG_NONE);
	if ((op2_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(insn->op2)) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op2_reg, insn->op2);
	}
	|	ASM_REG_IMM_OP cmp, type, op2_reg, 0
	ir_emit_jcc(ctx, IR_NE, b, def, insn, 1);
}

static void ir_emit_return_void(ir_ctx *ctx)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;

	ir_emit_epilogue(ctx);
	|	ret
}

static void ir_emit_return_int(ir_ctx *ctx, ir_reg ref, ir_insn *insn)
{
	ir_reg op2_reg = ctx->regs[ref][2];

	if (op2_reg != IR_REG_INT_RET1) {
		ir_type type = ctx->ir_base[insn->op2].type;

		if (op2_reg != IR_REG_NONE) {
			if (!(op2_reg & IR_REG_SPILL_LOAD)) {
				ir_emit_mov(ctx, type, IR_REG_INT_RET1, op2_reg);
			} else {
				ir_emit_load(ctx, type, IR_REG_INT_RET1, insn->op2);
			}
		} else {
			ir_emit_load(ctx, type, IR_REG_INT_RET1, insn->op2);
		}
	}
	ir_emit_return_void(ctx);
}

static void ir_emit_return_fp(ir_ctx *ctx, ir_reg ref, ir_insn *insn)
{
	ir_reg op2_reg = ctx->regs[ref][2];
	ir_type type = ctx->ir_base[insn->op2].type;

	if (op2_reg != IR_REG_FP_RET1) {
		if (op2_reg != IR_REG_NONE) {
			if (!(op2_reg & IR_REG_SPILL_LOAD)) {
				ir_emit_fp_mov(ctx, type, IR_REG_FP_RET1, op2_reg);
			} else {
				ir_emit_load(ctx, type, IR_REG_FP_RET1, insn->op2);
			}
		} else {
			ir_emit_load(ctx, type, IR_REG_FP_RET1, insn->op2);
		}
	}
	ir_emit_return_void(ctx);
}

static void ir_emit_sext(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_type dst_type = insn->type;
	ir_type src_type = ctx->ir_base[insn->op1].type;
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(IR_IS_TYPE_INT(src_type));
	IR_ASSERT(IR_IS_TYPE_INT(dst_type));
	IR_ASSERT(ir_type_size[dst_type] > ir_type_size[src_type]);
	IR_ASSERT(def_reg != IR_REG_NONE);
	if ((op1_reg != IR_REG_NONE) && ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(insn->op1))) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, src_type, op1_reg, insn->op1);
	}

	if (op1_reg != IR_REG_NONE) {
		if (ir_type_size[src_type] == 1) {
			if (ir_type_size[dst_type] == 2) {
				|	sxtb Rw(def_reg), Rw(op1_reg)
			} else if (ir_type_size[dst_type] == 4) {
				|	sxtb Rw(def_reg), Rw(op1_reg)
			} else {
				IR_ASSERT(ir_type_size[dst_type] == 8);
				|	sxtb Rx(def_reg), Rx(op1_reg)
			}
		} else if (ir_type_size[src_type] == 2) {
			if (ir_type_size[dst_type] == 4) {
				|	sxth Rw(def_reg), Rw(op1_reg)
			} else {
				IR_ASSERT(ir_type_size[dst_type] == 8);
				|	sxth Rx(def_reg), Rx(op1_reg)
			}
		} else {
			IR_ASSERT(ir_type_size[src_type] == 4);
			IR_ASSERT(ir_type_size[dst_type] == 8);
			|	sxtw Rx(def_reg), Rw(op1_reg)
		}
	} else if (IR_IS_CONST_REF(insn->op1)) {
		IR_ASSERT(0);
	} else {
		int32_t offset = ir_ref_spill_slot(ctx, insn->op1);
		ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;

		if (ir_type_size[src_type] == 1) {
			if (ir_type_size[dst_type] == 2) {
				|	ldrsb Rw(def_reg), [Rx(fp), #offset]
			} else if (ir_type_size[dst_type] == 4) {
				|	ldrsb Rw(def_reg), [Rx(fp), #offset]
			} else {
				IR_ASSERT(ir_type_size[dst_type] == 8);
				|	ldrsb Rx(def_reg), [Rx(fp), #offset]
			}
		} else if (ir_type_size[src_type] == 2) {
			if (ir_type_size[dst_type] == 4) {
				|	ldrsh Rw(def_reg), [Rx(fp), #offset]
			} else {
				IR_ASSERT(ir_type_size[dst_type] == 8);
				|	ldrsh Rx(def_reg), [Rx(fp), #offset]
			}
		} else {
			IR_ASSERT(ir_type_size[src_type] == 4);
			IR_ASSERT(ir_type_size[dst_type] == 8);
			|	ldrsw Rx(def_reg), [Rx(fp), #offset]
		}
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, dst_type, def, def_reg);
	}
}

static void ir_emit_zext(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_type dst_type = insn->type;
	ir_type src_type = ctx->ir_base[insn->op1].type;
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(IR_IS_TYPE_INT(src_type));
	IR_ASSERT(IR_IS_TYPE_INT(dst_type));
	IR_ASSERT(ir_type_size[dst_type] > ir_type_size[src_type]);
	IR_ASSERT(def_reg != IR_REG_NONE);
	if ((op1_reg != IR_REG_NONE) && ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(insn->op1))) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, src_type, op1_reg, insn->op1);
	}

	if (op1_reg != IR_REG_NONE) {
		if (ir_type_size[src_type] == 1) {
			|	uxtb Rw(def_reg), Rw(op1_reg)
		} else if (ir_type_size[src_type] == 2) {
			|	uxth Rw(def_reg), Rw(op1_reg)
		} else {
			|	mov Rw(def_reg), Rw(op1_reg)
		}
	} else if (IR_IS_CONST_REF(insn->op1)) {
		IR_ASSERT(0);
	} else {
		int32_t offset = ir_ref_spill_slot(ctx, insn->op1);
		ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;

		if (ir_type_size[src_type] == 1) {
			|	ldrb Rw(def_reg), [Rx(fp), #offset]
		} else if (ir_type_size[src_type] == 2) {
			|	ldrh Rw(def_reg), [Rx(fp), #offset]
		} else {
			IR_ASSERT(ir_type_size[src_type] == 4);
			IR_ASSERT(ir_type_size[dst_type] == 8);
			|	ldr Rw(def_reg), [Rx(fp), #offset]
		}
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, dst_type, def, def_reg);
	}
}

static void ir_emit_trunc(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_type dst_type = insn->type;
	ir_type src_type = ctx->ir_base[insn->op1].type;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(IR_IS_TYPE_INT(src_type));
	IR_ASSERT(IR_IS_TYPE_INT(dst_type));
	IR_ASSERT(ir_type_size[dst_type] < ir_type_size[src_type]);
	IR_ASSERT(def_reg != IR_REG_NONE);
	if (op1_reg != IR_REG_NONE && (op1_reg & IR_REG_SPILL_LOAD)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, src_type, op1_reg, insn->op1);
	}
	if (op1_reg != IR_REG_NONE) {
		if (op1_reg != def_reg) {
			ir_emit_mov(ctx, dst_type, def_reg, op1_reg);
		}
	} else {
		ir_emit_load(ctx, dst_type, def_reg, insn->op1);
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, dst_type, def, def_reg);
	}
}

static void ir_emit_bitcast(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_type dst_type = insn->type;
	ir_type src_type = ctx->ir_base[insn->op1].type;
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(ir_type_size[dst_type] == ir_type_size[src_type]);
	IR_ASSERT(def_reg != IR_REG_NONE);
	if (op1_reg != IR_REG_NONE && (op1_reg & IR_REG_SPILL_LOAD)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, src_type, op1_reg, insn->op1);
	}
	if (IR_IS_TYPE_INT(src_type) && IR_IS_TYPE_INT(dst_type)) {
		if (op1_reg != IR_REG_NONE) {
			if (op1_reg != def_reg) {
				ir_emit_mov(ctx, dst_type, def_reg, op1_reg);
			}
		} else {
			ir_emit_load(ctx, dst_type, def_reg, insn->op1);
		}
	} else if (IR_IS_TYPE_FP(src_type) && IR_IS_TYPE_FP(dst_type)) {
		if (op1_reg != IR_REG_NONE) {
			if (op1_reg != def_reg) {
				ir_emit_fp_mov(ctx, dst_type, def_reg, op1_reg);
			}
		} else {
			ir_emit_load(ctx, dst_type, def_reg, insn->op1);
		}
	} else if (IR_IS_TYPE_FP(src_type)) {
		IR_ASSERT(IR_IS_TYPE_INT(dst_type));
		if (op1_reg != IR_REG_NONE) {
			if (src_type == IR_DOUBLE) {
				|	fmov Rx(def_reg), Rd(op1_reg-IR_REG_FP_FIRST)
			} else {
				IR_ASSERT(src_type == IR_FLOAT);
				|	fmov Rw(def_reg), Rs(op1_reg-IR_REG_FP_FIRST)
			}
		} else if (IR_IS_CONST_REF(insn->op1)) {
			ir_insn *_insn = &ctx->ir_base[insn->op1];
			IR_ASSERT(0); //???
			if (src_type == IR_DOUBLE) {
//???				|	mov64 Rq(def_reg), _insn->val.i64
			} else {
				IR_ASSERT(src_type == IR_FLOAT);
//???				|	mov Rd(def_reg), _insn->val.i32
			}
		} else {
			int32_t offset = ir_ref_spill_slot(ctx, insn->op1);
			ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
			if (src_type == IR_DOUBLE) {
				|	ldr Rx(def_reg), [Rx(fp), #offset]
			} else {
				IR_ASSERT(src_type == IR_FLOAT);
				|	ldr Rw(def_reg), [Rx(fp), #offset]
			}
		}
	} else if (IR_IS_TYPE_FP(dst_type)) {
		IR_ASSERT(IR_IS_TYPE_INT(src_type));
		if (op1_reg != IR_REG_NONE) {
			if (dst_type == IR_DOUBLE) {
				|	fmov Rd(def_reg-IR_REG_FP_FIRST), Rx(op1_reg)
			} else {
				IR_ASSERT(dst_type == IR_FLOAT);
				|	fmov Rs(def_reg-IR_REG_FP_FIRST), Rw(op1_reg)
			}
		} else if (IR_IS_CONST_REF(insn->op1)) {
			IR_ASSERT(0); //???
		} else {
			int32_t offset = ir_ref_spill_slot(ctx, insn->op1);
			ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
			if (dst_type == IR_DOUBLE) {
				|	ldr Rd(def_reg), [Rx(fp), #offset]
			} else {
				IR_ASSERT(src_type == IR_FLOAT);
				|	ldr Rs(def_reg), [Rx(fp), #offset]
			}
		}
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, dst_type, def, def_reg);
	}
}

static void ir_emit_int2fp(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_type dst_type = insn->type;
	ir_type src_type = ctx->ir_base[insn->op1].type;
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(IR_IS_TYPE_INT(src_type));
	IR_ASSERT(IR_IS_TYPE_FP(dst_type));
	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE);
	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(insn->op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, src_type, op1_reg, insn->op1);
	}

	if (ir_type_size[src_type] == 8) {
		if (IR_IS_TYPE_SIGNED(src_type)) {
			if (dst_type == IR_DOUBLE) {
				|	scvtf Rd(def_reg-IR_REG_FP_FIRST), Rx(op1_reg)
			} else {
				IR_ASSERT(dst_type == IR_FLOAT);
				|	scvtf Rs(def_reg-IR_REG_FP_FIRST), Rx(op1_reg)
			}
		} else {
			if (dst_type == IR_DOUBLE) {
				|	ucvtf Rd(def_reg-IR_REG_FP_FIRST), Rx(op1_reg)
			} else {
				IR_ASSERT(dst_type == IR_FLOAT);
				|	ucvtf Rs(def_reg-IR_REG_FP_FIRST), Rx(op1_reg)
			}
		}
	} else {
		if (IR_IS_TYPE_SIGNED(src_type)) {
			if (dst_type == IR_DOUBLE) {
				|	scvtf Rd(def_reg-IR_REG_FP_FIRST), Rw(op1_reg)
			} else {
				IR_ASSERT(dst_type == IR_FLOAT);
				|	scvtf Rs(def_reg-IR_REG_FP_FIRST), Rw(op1_reg)
			}
		} else {
			if (dst_type == IR_DOUBLE) {
				|	ucvtf Rd(def_reg-IR_REG_FP_FIRST), Rw(op1_reg)
			} else {
				IR_ASSERT(dst_type == IR_FLOAT);
				|	ucvtf Rs(def_reg-IR_REG_FP_FIRST), Rw(op1_reg)
			}
		}
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, dst_type, def, def_reg);
	}
}

static void ir_emit_fp2int(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_type dst_type = insn->type;
	ir_type src_type = ctx->ir_base[insn->op1].type;
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(IR_IS_TYPE_FP(src_type));
	IR_ASSERT(IR_IS_TYPE_INT(dst_type));
	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE);
	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(insn->op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, src_type, op1_reg, insn->op1);
	}
	if (ir_type_size[dst_type] == 8) {
		if (IR_IS_TYPE_SIGNED(dst_type)) {
			if (src_type == IR_DOUBLE) {
				|	fcvtzs Rx(def_reg), Rd(op1_reg-IR_REG_FP_FIRST)
			} else {
				IR_ASSERT(src_type == IR_FLOAT);
				|	fcvtzs Rx(def_reg), Rs(op1_reg-IR_REG_FP_FIRST)
			}
		} else {
			if (src_type == IR_DOUBLE) {
				|	fcvtzu Rx(def_reg), Rd(op1_reg-IR_REG_FP_FIRST)
			} else {
				IR_ASSERT(src_type == IR_FLOAT);
				|	fcvtzu Rx(def_reg), Rs(op1_reg-IR_REG_FP_FIRST)
			}
		}
	} else {
		if (IR_IS_TYPE_SIGNED(dst_type)) {
			if (src_type == IR_DOUBLE) {
				|	fcvtzs Rw(def_reg), Rd(op1_reg-IR_REG_FP_FIRST)
			} else {
				IR_ASSERT(src_type == IR_FLOAT);
				|	fcvtzs Rw(def_reg), Rs(op1_reg-IR_REG_FP_FIRST)
			}
		} else {
			if (src_type == IR_DOUBLE) {
				|	fcvtzu Rw(def_reg), Rd(op1_reg-IR_REG_FP_FIRST)
			} else {
				IR_ASSERT(src_type == IR_FLOAT);
				|	fcvtzu Rw(def_reg), Rs(op1_reg-IR_REG_FP_FIRST)
			}
		}
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, dst_type, def, def_reg);
	}
}

static void ir_emit_fp2fp(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_type dst_type = insn->type;
	ir_type src_type = ctx->ir_base[insn->op1].type;
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(IR_IS_TYPE_FP(src_type));
	IR_ASSERT(IR_IS_TYPE_FP(dst_type));
	IR_ASSERT(def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE);
	if ((op1_reg & IR_REG_SPILL_LOAD) || IR_IS_CONST_REF(insn->op1)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, src_type, op1_reg, insn->op1);
	}
	if (src_type == dst_type) {
		if (op1_reg != def_reg) {
			ir_emit_fp_mov(ctx, dst_type, def_reg, op1_reg);
		}
	} else if (src_type == IR_DOUBLE) {
		|	fcvt Rs(def_reg-IR_REG_FP_FIRST), Rd(op1_reg-IR_REG_FP_FIRST)
	} else {
		IR_ASSERT(src_type == IR_FLOAT);
		|	fcvt Rd(def_reg-IR_REG_FP_FIRST), Rs(op1_reg-IR_REG_FP_FIRST)
	}
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, dst_type, def, def_reg);
	}
}

static void ir_emit_copy_int(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_ref type = insn->type;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(def_reg != IR_REG_NONE || op1_reg != IR_REG_NONE);
	if (op1_reg != IR_REG_NONE && (op1_reg & IR_REG_SPILL_LOAD)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, insn->op1);
	}
	if (def_reg == op1_reg) {
		/* same reg */
	} else if (def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE) {
		ir_emit_mov(ctx, type, def_reg, op1_reg);
	} else if (def_reg != IR_REG_NONE) {
		ir_emit_load(ctx, type, def_reg, insn->op1);
	} else if (op1_reg != IR_REG_NONE) {
		ir_emit_store(ctx, type, def, op1_reg);
	} else {
		IR_ASSERT(0);
	}
	if (def_reg != IR_REG_NONE && (ctx->regs[def][0] & IR_REG_SPILL_STORE)) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_copy_fp(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_type type = insn->type;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	ir_reg op1_reg = ctx->regs[def][1];

	IR_ASSERT(def_reg != IR_REG_NONE || op1_reg != IR_REG_NONE);
	if (op1_reg != IR_REG_NONE && (op1_reg & IR_REG_SPILL_LOAD)) {
		op1_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op1_reg, insn->op1);
	}
	if (def_reg == op1_reg) {
		/* same reg */
	} else if (def_reg != IR_REG_NONE && op1_reg != IR_REG_NONE) {
		ir_emit_mov(ctx, type, def_reg, op1_reg);
	} else if (def_reg != IR_REG_NONE) {
		ir_emit_load(ctx, type, def_reg, insn->op1);
	} else if (op1_reg != IR_REG_NONE) {
		ir_emit_store(ctx, type, def, op1_reg);
	} else {
		IR_ASSERT(0);
	}
	if (def_reg != IR_REG_NONE && (ctx->regs[def][0] & IR_REG_SPILL_STORE)) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_vaddr(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_ref type = insn->type;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);
	int32_t offset;
	ir_reg fp;

	IR_ASSERT(def_reg != IR_REG_NONE);
	offset = ir_ref_spill_slot(ctx, insn->op1);
	fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
//???	|	lea Ra(def_reg), aword [Ra(fp)+offset]
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_vload_int(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_ref type = insn->type;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);

	if (def_reg == IR_REG_NONE && ir_is_same_mem(ctx, insn->op2, def)) {
		return; // fake load
	}
	IR_ASSERT(def_reg != IR_REG_NONE);
	ir_emit_load(ctx, type, def_reg, insn->op2);
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_vload_fp(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_ref type = insn->type;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);

	if (def_reg == IR_REG_NONE && ir_is_same_mem(ctx, insn->op2, def)) {
		return; // fake load
	}
	IR_ASSERT(def_reg != IR_REG_NONE);

	ir_emit_load(ctx, type, def_reg, insn->op2);
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_vstore_int(ir_ctx *ctx, ir_ref ref, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_insn *val_insn = &ctx->ir_base[insn->op3];
	ir_ref type = val_insn->type;
	ir_reg op3_reg = ctx->regs[ref][3];
	int32_t offset;
	ir_reg fp;

	if ((op3_reg == IR_REG_NONE || (op3_reg & IR_REG_SPILL_LOAD))
	 && !IR_IS_CONST_REF(insn->op3) && ir_is_same_mem(ctx, insn->op3, insn->op2)) {
		return; // fake store
	}
//???	if (IR_IS_CONST_REF(insn->op3) && IR_IS_32BIT(type, val_insn->val)) {
		offset = ir_ref_spill_slot(ctx, insn->op2);
		fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
//???		|	ASM_MEM_IMM_OP mov, type, [Ra(fp)+offset], val_insn->val.i32
//???	} else {
		IR_ASSERT(op3_reg != IR_REG_NONE);
		if (op3_reg != IR_REG_NONE && (op3_reg & IR_REG_SPILL_LOAD)) {
			op3_reg &= ~IR_REG_SPILL_LOAD;
			ir_emit_load(ctx, type, op3_reg, insn->op3);
		}
		if (IR_IS_CONST_REF(insn->op3)) {
			ir_emit_load(ctx, type, op3_reg, insn->op3);
		}
		ir_emit_store(ctx, type, insn->op2, op3_reg);
//???	}
}

static void ir_emit_vstore_fp(ir_ctx *ctx, ir_ref ref, ir_insn *insn)
{
	ir_ref type = ctx->ir_base[insn->op3].type;
	ir_reg op3_reg = ctx->regs[ref][3];

	if ((op3_reg == IR_REG_NONE || (op3_reg & IR_REG_SPILL_LOAD))
	 && !IR_IS_CONST_REF(insn->op3) && ir_is_same_mem(ctx, insn->op3, insn->op2)) {
		return; // fake store
	}
	IR_ASSERT(op3_reg != IR_REG_NONE);
	if (op3_reg != IR_REG_NONE && (op3_reg & IR_REG_SPILL_LOAD)) {
		op3_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op3_reg, insn->op3);
	}
	if (IR_IS_CONST_REF(insn->op3)) {
		ir_emit_load(ctx, type, op3_reg, insn->op3);
	}
	ir_emit_store(ctx, type, insn->op2, op3_reg);
}

static void ir_emit_load_int(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_ref type = insn->type;
	ir_reg op2_reg = ctx->regs[def][2];
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);

	IR_ASSERT(def_reg != IR_REG_NONE);
	if (op2_reg != IR_REG_NONE && (op2_reg & IR_REG_SPILL_LOAD)) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op2_reg, insn->op2);
	}
	if (op2_reg == IR_REG_NONE) {
		op2_reg = def_reg;
		ir_emit_load(ctx, type, op2_reg, insn->op2);
	}
	ir_emit_load_mem_int(ctx, type, def_reg, op2_reg, 0);
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_load_fp(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_ref type = insn->type;
	ir_reg op2_reg = ctx->regs[def][2];
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);

	IR_ASSERT(def_reg != IR_REG_NONE && op2_reg != IR_REG_NONE);
	if (op2_reg != IR_REG_NONE && (op2_reg & IR_REG_SPILL_LOAD)) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op2_reg, insn->op2);
	}
	ir_emit_load_mem_fp(ctx, type, def_reg, op2_reg, 0);
	if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
		ir_emit_store(ctx, type, def, def_reg);
	}
}

static void ir_emit_store_int(ir_ctx *ctx, ir_reg ref, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_insn *val_insn = &ctx->ir_base[insn->op3];
	ir_ref type = val_insn->type;
	ir_reg op2_reg = ctx->regs[ref][2];
	ir_reg op3_reg = ctx->regs[ref][3];

	IR_ASSERT(op2_reg != IR_REG_NONE);
	if (op2_reg != IR_REG_NONE && (op2_reg & IR_REG_SPILL_LOAD)) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op2_reg, insn->op2);
	}
//???	if (IR_IS_CONST_REF(insn->op3) && IR_IS_32BIT(type, val_insn->val)) {
//???		|	ASM_MEM_IMM_OP mov, type, [Ra(op2_reg)], val_insn->val.i32
//???	} else {
		IR_ASSERT(op3_reg != IR_REG_NONE);
		if (op3_reg != IR_REG_NONE && (op3_reg & IR_REG_SPILL_LOAD)) {
			op3_reg &= ~IR_REG_SPILL_LOAD;
			ir_emit_load(ctx, type, op3_reg, insn->op3);
		}
		if (IR_IS_CONST_REF(insn->op3)) {
			ir_emit_load(ctx, type, op3_reg, insn->op3);
		}
		ir_emit_store_mem_int(ctx, type, op2_reg, 0, op3_reg);
//???	}
}

static void ir_emit_store_fp(ir_ctx *ctx, ir_ref ref, ir_insn *insn)
{
	ir_ref type = ctx->ir_base[insn->op3].type;
	ir_reg op2_reg = ctx->regs[ref][2];
	ir_reg op3_reg = ctx->regs[ref][3];

	IR_ASSERT(op2_reg != IR_REG_NONE && op2_reg != IR_REG_NONE);
	if (op2_reg != IR_REG_NONE && (op2_reg & IR_REG_SPILL_LOAD)) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op2_reg, insn->op2);
	}
	if (op3_reg != IR_REG_NONE && (op3_reg & IR_REG_SPILL_LOAD)) {
		op3_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op3_reg, insn->op3);
	}
	if (IR_IS_CONST_REF(insn->op3)) {
		ir_emit_load(ctx, type, op3_reg, insn->op3);
	}
	ir_emit_store_mem_fp(ctx, type, op2_reg, 0, op3_reg);
}

static void ir_emit_alloca(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg def_reg = IR_REG_NUM(ctx->regs[def][0]);

	if (IR_IS_CONST_REF(insn->op2)) {
		ir_insn *val = &ctx->ir_base[insn->op2];
		int32_t size = val->val.i32;

		IR_ASSERT(IR_IS_TYPE_INT(val->type));
		IR_ASSERT(IR_IS_TYPE_UNSIGNED(val->type) || val->val.i64 > 0);
//???		IR_ASSERT(IR_IS_SIGNED_32BIT(val->val.i64));

		if (ctx->flags & IR_HAS_CALLS) {
			/* Stack must be 16 byte aligned */
			size = IR_ALIGNED_SIZE(size, 16);
		} else {
			size = IR_ALIGNED_SIZE(size, 8);
		}
//???		|	ASM_REG_IMM_OP sub, IR_ADDR, IR_REG_RSP, size
	} else {
		int32_t alignment = (ctx->flags & IR_HAS_CALLS) ? 16 : 8;
		ir_reg op2_reg = ctx->regs[def][2];
		ir_type type = ctx->ir_base[insn->op2].type;

		IR_ASSERT(def_reg != IR_REG_NONE);
		if (op2_reg != IR_REG_NONE && (op2_reg & IR_REG_SPILL_LOAD)) {
			op2_reg &= ~IR_REG_SPILL_LOAD;
			ir_emit_load(ctx, type, op2_reg, insn->op2);
		}
		if (def_reg != op2_reg) {
			if (op2_reg != IR_REG_NONE) {
				ir_emit_mov(ctx, type, def_reg, op2_reg);
			} else {
				ir_emit_load(ctx, type, def_reg, insn->op2);
			}
		}

//???		|	ASM_REG_IMM_OP add, IR_ADDR, def_reg, (alignment-1)
//???		|	ASM_REG_IMM_OP and, IR_ADDR, def_reg, ~(alignment-1)
//???		|	ASM_REG_REG_OP sub, IR_ADDR, IR_REG_RSP, def_reg
	}
	if (def_reg != IR_REG_NONE) {
//???		|	mov Ra(def_reg), Ra(IR_REG_RSP)
		if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
			ir_emit_store(ctx, insn->type, def, def_reg);
		}
	} else {
		ir_emit_store(ctx, IR_ADDR, def, IR_REG_STACK_POINTER);
	}
}

static void ir_emit_switch(ir_ctx *ctx, int b, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_type type;
	ir_block *bb;
	ir_insn *use_insn, *val;
	uint32_t n, *p, use_block;
	int i;
	int label, default_label = 0;
	int count = 0;
	ir_val min, max;
	int64_t offset;
	ir_reg op2_reg, tmp_reg;

	type = ctx->ir_base[insn->op2].type;
	if (IR_IS_TYPE_SIGNED(type)) {
		min.u64 = 0x7fffffffffffffff;
		max.u64 = 0x8000000000000000;
	} else {
		min.u64 = 0xffffffffffffffff;
		max.u64 = 0x0;
	}

	bb = &ctx->cfg_blocks[b];
	p = &ctx->cfg_edges[bb->successors];
	for (n = bb->successors_count; n != 0; p++, n--) {
		use_block = *p;
		use_insn = &ctx->ir_base[ctx->cfg_blocks[use_block].start];
		if (use_insn->op == IR_CASE_VAL) {
			val = &ctx->ir_base[use_insn->op2];
			if (IR_IS_TYPE_SIGNED(type)) {
				IR_ASSERT(IR_IS_TYPE_SIGNED(val->type));
				min.i64 = IR_MIN(min.i64, val->val.i64);
				max.i64 = IR_MAX(max.i64, val->val.i64);
			} else {
				IR_ASSERT(!IR_IS_TYPE_SIGNED(val->type));
				min.u64 = (int64_t)IR_MIN(min.u64, val->val.u64);
				max.u64 = (int64_t)IR_MAX(max.u64, val->val.u64);
			}
			count++;
		} else if (use_insn->op == IR_CASE_DEFAULT) {
			default_label = ir_skip_empty_blocks(ctx, use_block);
		} else {
			IR_ASSERT(0);
		}
	}

	op2_reg = ctx->regs[def][2];
	tmp_reg = ctx->regs[def][3];

	IR_ASSERT(op2_reg != IR_REG_NONE);
	IR_ASSERT(tmp_reg != IR_REG_NONE || sizeof(void*) != 8);
	if (op2_reg & IR_REG_SPILL_LOAD) {
		op2_reg &= ~IR_REG_SPILL_LOAD;
		ir_emit_load(ctx, type, op2_reg, insn->op2);
	} else if (IR_IS_CONST_REF(insn->op2)) {
		ir_emit_load(ctx, type, op2_reg, insn->op2);
	}

	/* Generate a table jmp or a seqence of calls */
	if ((max.i64-min.i64) < count * 8) {
		int *labels = ir_mem_malloc(sizeof(int) * (max.i64 - min.i64 + 1));

		for (i = 0; i <= (max.i64 - min.i64); i++) {
			labels[i] = default_label;
		}
		p = &ctx->cfg_edges[bb->successors];
		for (n = bb->successors_count; n != 0; p++, n--) {
			use_block = *p;
			use_insn = &ctx->ir_base[ctx->cfg_blocks[use_block].start];
			if (use_insn->op == IR_CASE_VAL) {
				val = &ctx->ir_base[use_insn->op2];
				label = ir_skip_empty_blocks(ctx, use_block);
				labels[val->val.i64 - min.i64] = label;
			}
		}

//???		if (IR_IS_32BIT(type, max)) {
//???			|	ASM_REG_IMM_OP cmp, type, op2_reg, max.i32
//???		} else {
			IR_ASSERT(ir_type_size[type] == 8);
//???			|	mov64 Rq(tmp_reg), max.i64
//???			|	cmp Rq(op2_reg), Rq(tmp_reg)
//???		}
		if (IR_IS_TYPE_SIGNED(type)) {
//???			|	jg =>default_label
		} else {
//???			|	ja =>default_label
		}

//???		if (IR_IS_32BIT(type, min)) {
			offset = -min.i64 * sizeof(void*);
//???			if (IR_IS_SIGNED_32BIT(offset)) {
//???				|	ASM_REG_IMM_OP cmp, type, op2_reg, min.i32
//???			} else {
//???				|	ASM_REG_REG_OP sub, type, op2_reg, (int32_t)offset // TODO: reg clobbering
//???				offset = 0;
//???			}
//???		} else {
//???			|	mov64 Rq(tmp_reg), min.i64
//???			|	ASM_REG_REG_OP sub, type, op2_reg, tmp_reg // TODO: reg clobbering
			offset = 0;
//???		}
		if (IR_IS_TYPE_SIGNED(type)) {
//???			|	jl =>default_label
		} else {
//???			|	jb =>default_label
		}
		switch (ir_type_size[type]) {
			case 1:
				if (IR_IS_TYPE_SIGNED(type)) {
//???					|	movsx Ra(op2_reg), Rb(op2_reg)
				} else {
//???					|	movzx Ra(op2_reg), Rb(op2_reg)
				}
				break;
			case 2:
				if (IR_IS_TYPE_SIGNED(type)) {
//???					|	movsx Ra(op2_reg), Rw(op2_reg)
				} else {
//???					|	movzx Ra(op2_reg), Rw(op2_reg)
				}
				break;
			case 4:
				if (IR_IS_TYPE_SIGNED(type)) {
//???					|	movsxd Ra(op2_reg), Rd(op2_reg)
				} else {
//???					|	mov Rd(op2_reg), Rd(op2_reg)
				}
				break;
			case 8:
				break;
			default:
				IR_ASSERT(0);
		}
//???		|	lea Ra(tmp_reg), aword [>1]
//???		|	jmp aword [Ra(tmp_reg)+Ra(op2_reg)*8+(int32_t)offset]
		|.jmp_table
		if (!data->jmp_table_label) {
			data->jmp_table_label = ctx->cfg_blocks_count + ctx->consts_count + 3;
			|=>data->jmp_table_label:
		}
		|.align 8
		|1:
		for (i = 0; i <= (max.i64 - min.i64); i++) {
			|	.addr =>labels[i]
		}
		|.code
		ir_mem_free(labels);
	} else {
		p = &ctx->cfg_edges[bb->successors];
		for (n = bb->successors_count; n != 0; p++, n--) {
			use_block = *p;
			use_insn = &ctx->ir_base[ctx->cfg_blocks[use_block].start];
			if (use_insn->op == IR_CASE_VAL) {
				val = &ctx->ir_base[use_insn->op2];
				label = ir_skip_empty_blocks(ctx, use_block);
//???				if (IR_IS_32BIT(type, val->val)) {
//???					|	ASM_REG_IMM_OP cmp, type, op2_reg, val->val.i32
//???				} else {
//???					|	mov64 Ra(tmp_reg), val->val.i64
//???					|	ASM_REG_REG_OP cmp, type, op2_reg, tmp_reg
//???				}
//???				|	je =>label
			}
		}
		if (default_label) {
//???			|	jmp =>default_label
		}
	}
}

#include <dlfcn.h>

static void *ir_resolve_sym_name(const char *name)
{
	void *handle = NULL;
	void *addr;

#ifdef RTLD_DEFAULT
	handle = RTLD_DEFAULT;
#endif
	addr = dlsym(handle, name);
	IR_ASSERT(addr != NULL);
	return addr;
}

typedef struct _ir_copy {
	ir_type type;
	ir_reg  from;
	ir_reg  to;
} ir_copy;

static int ir_parallel_copy(ir_ctx *ctx, ir_copy *copies, int count, ir_reg tmp_reg, ir_reg tmp_fp_reg)
{
	int i;
	int8_t *pred, *loc, *types;
	ir_reg to, from_reg;
	ir_type type;
	ir_regset todo, ready;

	loc = ir_mem_malloc(IR_REG_NUM * 3 * sizeof(int8_t));
	pred = loc + IR_REG_NUM;
	types = pred + IR_REG_NUM;
	memset(loc, IR_REG_NONE, IR_REG_NUM * 2 * sizeof(int8_t));
	todo = IR_REGSET_EMPTY;
	ready = IR_REGSET_EMPTY;

	for (i = 0; i < count; i++) {
		from_reg = copies[i].from;
		to = copies[i].to;
		if (from_reg != to) {
			loc[from_reg] = from_reg;
			pred[to] = from_reg;
			types[to] = copies[i].type;
			IR_REGSET_INCL(todo, to);
		}
	}

	IR_REGSET_FOREACH(todo, i) {
		if (loc[i] == IR_REG_NONE) {
			IR_REGSET_INCL(ready, i);
		}
	} IR_REGSET_FOREACH_END();

	while (todo != IR_REGSET_EMPTY) {
		ir_ref /*a, b,*/ c;

		while (ready != IR_REGSET_EMPTY) {
			to = IR_REGSET_FIRST(ready);
			IR_REGSET_EXCL(ready, to);
			from_reg = pred[to];
			type = types[to];
			c = loc[from_reg];
			if (IR_IS_TYPE_INT(type)) {
				ir_emit_mov(ctx, type, to, c);
			} else {
				ir_emit_fp_mov(ctx, type, to, c);
			}
			loc[from_reg] = to;
			if (from_reg == c && pred[from_reg] != IR_REG_NONE) {
				IR_REGSET_INCL(ready, from_reg);
			}
		}
		to = IR_REGSET_FIRST(todo);
		IR_REGSET_EXCL(todo, to);
		from_reg = pred[to];
		if (to != loc[from_reg]) {
			type = types[to];
			if (IR_IS_TYPE_INT(type)) {
				IR_ASSERT(tmp_reg != IR_REG_NONE);
				IR_ASSERT(tmp_reg >= IR_REG_GP_FIRST && tmp_reg <= IR_REG_GP_LAST);
				ir_emit_mov(ctx, type, tmp_reg, to);
				loc[to] = tmp_reg;
			} else {
				IR_ASSERT(tmp_fp_reg != IR_REG_NONE);
				IR_ASSERT(tmp_fp_reg >= IR_REG_FP_FIRST && tmp_fp_reg <= IR_REG_FP_LAST);
				ir_emit_fp_mov(ctx, type, tmp_fp_reg, to);
				loc[to] = tmp_fp_reg;
			}
			IR_REGSET_INCL(ready, to);
		}
	}

	ir_mem_free(loc);

	return 1;
}

static int32_t ir_call_used_stack(ir_ctx *ctx, ir_insn *insn, bool align)
{
	int j, n;
	ir_type type;
	int int_param = 0;
	int fp_param = 0;
	int int_reg_params_count = IR_REG_INT_ARGS;
	int fp_reg_params_count = IR_REG_FP_ARGS;
	int32_t used_stack = 0;

	n = ir_input_edges_count(ctx, insn);
	for (j = 3; j <= n; j++) {
		type = ctx->ir_base[insn->ops[j]].type;
		if (IR_IS_TYPE_INT(type)) {
			if (int_param >= int_reg_params_count) {
				used_stack += IR_MAX(sizeof(void*), ir_type_size[type]);
			}
			int_param++;
		} else if (IR_IS_TYPE_FP(type)) {
			if (fp_param >= fp_reg_params_count) {
				used_stack += IR_MAX(sizeof(void*), ir_type_size[type]);
			}
			fp_param++;
		} else {
			IR_ASSERT(0);
		}
	}

	if (align && used_stack % 16 != 0) {
		/* Stack must be 16 byte aligned */
		used_stack += sizeof(void*);
	}

	return used_stack;
}

static int32_t ir_emit_arguments(ir_ctx *ctx, ir_ref def, ir_insn *insn, ir_reg tmp_reg)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	int j, n;
	ir_ref arg;
	ir_insn *arg_insn;
	uint8_t type;
	ir_reg src_reg, dst_reg;
	int int_param = 0;
	int fp_param = 0;
	int count = 0;
	int int_reg_params_count = IR_REG_INT_ARGS;
	int fp_reg_params_count = IR_REG_FP_ARGS;
	const int8_t *int_reg_params = _ir_int_reg_params;
	const int8_t *fp_reg_params = _ir_fp_reg_params;
	int32_t used_stack, stack_offset = 0;
	ir_copy *copies;
	bool has_mem_const_args = 0;
	ir_reg tmp_fp_reg = IR_REG_FP_LAST; /* Temporary register for FP loads and swap */

	if (insn->op == IR_CALL && (ctx->flags & IR_PREALLOCATED_STACK)) {
		// TODO: support for preallocated stack
		used_stack = 0;
	} else {
		used_stack = ir_call_used_stack(ctx, insn, 1);
		data->call_stack_size += used_stack;
		if (used_stack) {
			|	sub sp, sp, #used_stack
		}
	}

	/* 1. move all arguments that should be passed through stack
	 *    and collect arguments that should be passed through registers */
	n = ir_input_edges_count(ctx, insn);
	copies = ir_mem_malloc((n - 2) * sizeof(ir_copy));
	for (j = 3; j <= n; j++) {
		arg = insn->ops[j];
		src_reg = ctx->regs[def][j];
		arg_insn = &ctx->ir_base[arg];
		type = arg_insn->type;
		if (IR_IS_TYPE_INT(type)) {
			if (int_param < int_reg_params_count) {
				dst_reg = int_reg_params[int_param];
			} else {
				dst_reg = IR_REG_NONE; /* pass argument through stack */
			}
			int_param++;
		} else if (IR_IS_TYPE_FP(type)) {
			if (fp_param < fp_reg_params_count) {
				dst_reg = fp_reg_params[fp_param];
			} else {
				dst_reg = IR_REG_NONE; /* pass argument through stack */
			}
			fp_param++;
		} else {
			IR_ASSERT(0);
		}
		if (dst_reg != IR_REG_NONE && (IR_IS_CONST_REF(arg) || src_reg == IR_REG_NONE)) {
			/* delay CONST->REG and MEM->REG moves to third pass */
			has_mem_const_args = 1;
			continue;
		}
		if (dst_reg != IR_REG_NONE) {
			IR_ASSERT(src_reg != IR_REG_NONE);
			if (src_reg & IR_REG_SPILL_LOAD) {
				src_reg &= ~IR_REG_SPILL_LOAD;
				ir_emit_load(ctx, type, src_reg, arg);
			}
			if (src_reg != dst_reg) {
				/* delay REG->REG moves to second pass */
				copies[count].type = type;
				copies[count].from = src_reg;
				copies[count].to = dst_reg;
				count++;
			}
		} else {
			/* Pass argument through stack (REG->MEM, IMM->MEM, MEM->MEM moves) */
			if (IR_IS_TYPE_INT(type)) {
				if (IR_IS_CONST_REF(arg)) {
					ir_insn *val_insn = &ctx->ir_base[arg];

					if (val_insn->op == IR_STR) {
						int label = ctx->cfg_blocks_count - arg;

						val_insn->emit_const = 1;
						IR_ASSERT(tmp_reg != IR_REG_NONE);
//???						|	lea Ra(tmp_reg), aword [=>label]
//???						|	mov [Ra(IR_REG_RSP)+stack_offset], Ra(tmp_reg)
//???					} else if (IR_IS_SIGNED_32BIT(val_insn->val.i64)) {
						if (ir_type_size[type] <= 4) {
//???							|	mov dword [Ra(IR_REG_RSP)+stack_offset], val_insn->val.i32
						} else {
//???							|	mov qword [rsp+stack_offset], val_insn->val.i32
						}
					} else {
						IR_ASSERT(tmp_reg != IR_REG_NONE);
//???						|	mov64 Ra(tmp_reg), val_insn->val.i64
//???						|	mov [rsp+stack_offset], Ra(tmp_reg)
					}
				} else if (src_reg != IR_REG_NONE) {
					if (src_reg & IR_REG_SPILL_LOAD) {
						src_reg &= ~IR_REG_SPILL_LOAD;
						ir_emit_load(ctx, type, src_reg, arg);
					}
					ir_emit_store_mem_int(ctx, type, IR_REG_STACK_POINTER, stack_offset, src_reg);
				} else {
					IR_ASSERT(tmp_reg != IR_REG_NONE);
					ir_emit_load(ctx, type, tmp_reg, arg);
					ir_emit_store_mem_int(ctx, type, IR_REG_STACK_POINTER, stack_offset, tmp_reg);
				}
			} else {
				if (IR_IS_CONST_REF(arg)) {
					ir_val *val = &ctx->ir_base[arg].val;
					if (ir_type_size[type] == 4) {
//???						|	mov dword [Ra(IR_REG_RSP)+stack_offset], val->i32
					} else if (sizeof(void*) == 8) {
						if (val->i64 == 0) {
//???							|	mov qword [rsp+stack_offset], val->i32
						} else {
							IR_ASSERT(tmp_reg != IR_REG_NONE);
//???							|	mov64 Rq(tmp_reg), val->i64
//???							|	mov qword [rsp+stack_offset], Ra(tmp_reg)
						}
					} else {
						ir_emit_load(ctx, type, tmp_fp_reg, arg);
						ir_emit_store_mem_fp(ctx, IR_DOUBLE, IR_REG_STACK_POINTER, stack_offset, tmp_fp_reg);
					}
				} else if (src_reg != IR_REG_NONE) {
					if (src_reg & IR_REG_SPILL_LOAD) {
						src_reg &= ~IR_REG_SPILL_LOAD;
						ir_emit_load(ctx, type, src_reg, arg);
					}
					ir_emit_store_mem_fp(ctx, type, IR_REG_STACK_POINTER, stack_offset, src_reg);
				} else {
					IR_ASSERT(tmp_fp_reg != IR_REG_NONE);
					ir_emit_load(ctx, type, tmp_fp_reg, arg);
					ir_emit_store_mem_fp(ctx, IR_DOUBLE, IR_REG_STACK_POINTER, stack_offset, tmp_fp_reg);
				}
			}
			stack_offset += IR_MAX(sizeof(void*), ir_type_size[type]);
		}
	}

	/* 2. move all arguments that should be passed from one register to anouther (REG->REG movs) */
	if (count) {
		ir_parallel_copy(ctx, copies, count, tmp_reg, tmp_fp_reg);
	}
	ir_mem_free(copies);

	/* 3. move the remaining memory and immediate values to registers */
	if (has_mem_const_args) {
		int_param = 0;
		fp_param = 0;
		for (j = 3; j <= n; j++) {
			arg = insn->ops[j];
			src_reg = ctx->regs[def][j];
			arg_insn = &ctx->ir_base[arg];
			type = arg_insn->type;
			if (IR_IS_TYPE_INT(type)) {
				if (int_param < int_reg_params_count) {
					dst_reg = int_reg_params[int_param];
				} else {
					dst_reg = IR_REG_NONE; /* argument already passed through stack */
				}
				int_param++;
			} else if (IR_IS_TYPE_FP(type)) {
				if (fp_param < fp_reg_params_count) {
					dst_reg = fp_reg_params[fp_param];
				} else {
					dst_reg = IR_REG_NONE; /* argument already passed through stack */
				}
				fp_param++;
			} else {
				IR_ASSERT(0);
			}
			if (dst_reg != IR_REG_NONE && (IR_IS_CONST_REF(arg) || src_reg == IR_REG_NONE)) {
				if (IR_IS_TYPE_INT(type)) {
					if (IR_IS_CONST_REF(arg)) {
						if (type == IR_ADDR) {
							ir_insn *val_insn = &ctx->ir_base[arg];

							if (val_insn->op == IR_STR) {
								int label = ctx->cfg_blocks_count - arg;

								val_insn->emit_const = 1;
								|	adr Rx(dst_reg), =>label
								continue;
							}
						} else if (ir_type_size[type] == 1) {
							type = IR_ADDR;
						}
					}
					ir_emit_load(ctx, type, dst_reg, arg);
				} else {
					ir_emit_load(ctx, type, dst_reg, arg);
				}
			}
		}
	}
	return used_stack;
}

static void ir_emit_call(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg def_reg;
	int32_t used_stack = ir_emit_arguments(ctx, def, insn, ctx->regs[def][1]);

	if (IR_IS_CONST_REF(insn->op2)) {
		const char *name = ir_get_str(ctx, ctx->ir_base[insn->op2].val.addr);
		void *addr = ir_resolve_sym_name(name);

//???		if (sizeof(void*) == 4 /*|| IR_IS_SIGNED_32BIT(addr)*/) { // TODO: 32-bit IP relative or 64-bit absolute address
			|	bl &addr
//???			|	call aword &addr
//???		} else {
//???			|	mov64 rax, ((ptrdiff_t)addr)  // 0x48 0xb8 <imm-64-bit>
//???			|	call rax
//???		}
    } else {
		ir_reg op2_reg = ctx->regs[def][2];

		if (op2_reg != IR_REG_NONE) {
			if (op2_reg & IR_REG_SPILL_LOAD) {
				op2_reg &= ~IR_REG_SPILL_LOAD;
				ir_emit_load(ctx, IR_ADDR, op2_reg, insn->op2);
			}
//???			|	call Ra(op2_reg)
		} else {
			int32_t offset = ir_ref_spill_slot(ctx, insn->op2);
			ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
//???			|	call aword [Ra(fp)+offset]
		}
    }

	if (used_stack) {
		|	add sp, sp, #used_stack
		data->call_stack_size -= used_stack;
	}

	if (insn->type != IR_VOID) {
		if (IR_IS_TYPE_INT(insn->type)) {
			def_reg = IR_REG_NUM(ctx->regs[def][0]);
			if (def_reg != IR_REG_NONE) {
				if (def_reg != IR_REG_INT_RET1) {
					ir_emit_mov(ctx, insn->type, def_reg, IR_REG_INT_RET1);
				}
				if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
					ir_emit_store(ctx, insn->type, def, def_reg);
				}
			} else {
				ir_emit_store(ctx, insn->type, def, IR_REG_INT_RET1);
			}
		} else if (IR_IS_TYPE_FP(insn->type)) {
			def_reg = IR_REG_NUM(ctx->regs[def][0]);
			if (def_reg != IR_REG_NONE) {
				if (def_reg != IR_REG_FP_RET1) {
					ir_emit_fp_mov(ctx, insn->type, def_reg, IR_REG_FP_RET1);
				}
				if (ctx->regs[def][0] & IR_REG_SPILL_STORE) {
					ir_emit_store(ctx, insn->type, def, def_reg);
				}
			} else {
				ir_emit_store(ctx, insn->type, def, IR_REG_FP_RET1);
			}
		} else {
			IR_ASSERT(0);
		}
	}
}

static void ir_emit_tailcall(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	int32_t used_stack = ir_emit_arguments(ctx, def, insn, ctx->regs[def][1]);

	IR_ASSERT(used_stack == 0);

	ir_emit_epilogue(ctx);

	if (IR_IS_CONST_REF(insn->op2)) {
		const char *name = ir_get_str(ctx, ctx->ir_base[insn->op2].val.addr);
		void *addr = ir_resolve_sym_name(name);

		if (sizeof(void*) == 4 /*|| IR_IS_SIGNED_32BIT(addr)*/) { // TODO: 32-bit IP relative or 64-bit absolute address
//???			|	jmp aword &addr
		} else {
//???			|	mov64 rax, ((ptrdiff_t)addr)  // 0x48 0xb8 <imm-64-bit>
//???			|	jmp rax
		}
    } else {
		ir_reg op2_reg = ctx->regs[def][2];

		if (op2_reg != IR_REG_NONE) {
			if (op2_reg & IR_REG_SPILL_LOAD) {
				op2_reg &= ~IR_REG_SPILL_LOAD;
				ir_emit_load(ctx, IR_ADDR, op2_reg, insn->op2);
			}
//???			|	jmp Ra(op2_reg)
		} else {
			int32_t offset = ir_ref_spill_slot(ctx, insn->op2);
			ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
//???			|	jmp aword [Ra(fp)+offset]
		}
    }
}

static void ir_emit_ijmp(ir_ctx *ctx, ir_ref def, ir_insn *insn)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	ir_reg op2_reg = ctx->regs[def][2];

	if (op2_reg != IR_REG_NONE) {
		if (op2_reg & IR_REG_SPILL_LOAD) {
			op2_reg &= ~IR_REG_SPILL_LOAD;
			ir_emit_load(ctx, IR_ADDR, op2_reg, insn->op2);
		}
//???		|	jmp Ra(op2_reg)
	} else {
		int32_t offset = ir_ref_spill_slot(ctx, insn->op2);
		ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;
//???		|	jmp aword [Ra(fp)+offset]
	}
}

static int ir_emit_dessa_move(ir_ctx *ctx, uint8_t type, ir_ref from, ir_ref to)
{
	ir_backend_data *data = ctx->data;
	dasm_State **Dst = &data->dasm_state;
	uint32_t from_block = data->dessa_from_block;
	ir_block *from_bb = &ctx->cfg_blocks[from_block];
	ir_ref ref = from_bb->end;
	int8_t to_reg, from_reg;
	ir_block *to_bb;
	int j, k = 0;
	ir_ref phi = 0;
	bool spill_store = 0;

	IR_ASSERT(from_bb->successors_count == 1);
	to_bb = &ctx->cfg_blocks[ctx->cfg_edges[from_bb->successors]];
	for (j = 0; j < to_bb->predecessors_count; j++) {
		if (ctx->cfg_edges[to_bb->predecessors + j] == from_block) {
			k = j + 2;
			break;
		}
	}
	IR_ASSERT(k != 0);
	if (to) {
		phi = to;
	} else {
		ir_use_list *use_list = &ctx->use_lists[from];

		for (j = 0; j < use_list->count; j++) {
			ir_ref use = ctx->use_edges[use_list->refs + j];
			ir_insn *insn = &ctx->ir_base[use];
			if (insn->op == IR_PHI && insn->ops[k] == from && insn->op1 == to_bb->start) {
				phi = use;
				break;
			}
		}
	}
	IR_ASSERT(phi != 0);

	if (IR_IS_TYPE_INT(type)) {
		to_reg = to ? ctx->regs[phi][0] : ctx->regs[ref][0]; /* temporary register for integer swap (see ir_fix_dessa_tmps) */
		from_reg = from ? ctx->regs[phi][k] : ctx->regs[ref][0]; /* temporary register for integer swap (see ir_fix_dessa_tmps) */
		if (from_reg != IR_REG_NONE && (from_reg & IR_REG_SPILL_LOAD)) {
			from_reg &= ~IR_REG_SPILL_LOAD;
			ir_emit_load(ctx, type, from_reg, from);
		}
		if (to_reg != IR_REG_NONE && (to_reg & IR_REG_SPILL_STORE)) {
			to_reg &= ~IR_REG_SPILL_STORE;
			spill_store = 1;
		}
		if (from_reg != IR_REG_NONE && to_reg != IR_REG_NONE) {
			if (from_reg != to_reg) {
				ir_emit_mov(ctx, type, to_reg, from_reg);
			}
		} else if (to_reg != IR_REG_NONE) {
			ir_emit_load(ctx, type, to_reg, from);
		} else if (from_reg != IR_REG_NONE) {
			ir_emit_store(ctx, type, to, from_reg);
//???		} else if (IR_IS_CONST_REF(from) && (ir_type_size[type] != 8 || IR_IS_SIGNED_32BIT(ctx->ir_base[from].val.i64))) {
//???			|	ASM_MREF_IMM_OP mov, type, to, ctx->ir_base[from].val.i32
//???		} else if (IR_IS_CONST_REF(from) && ir_type_size[type] == 8 && IR_IS_UNSIGNED_32BIT(ctx->ir_base[from].val.u64)) {
//???			|	mov Rd(to), ctx->ir_base[from].val.u32
		} else if (IR_IS_CONST_REF(from) || !ir_is_same_mem(ctx, from, to)) {
			from_reg = ctx->regs[ref][1]; /* temporary register for int mem->mem (see ir_fix_dessa_tmps) */
			IR_ASSERT(from_reg != IR_REG_NONE);
			ir_emit_load(ctx, type, from_reg, from);
			ir_emit_store(ctx, type, to, from_reg);
		}
		if (spill_store) {
			ir_emit_store(ctx, type, to, to_reg);
		}
	} else {
		to_reg = to ? ctx->regs[phi][0] : ctx->regs[ref][2]; /* temporary register for fp swap (see ir_fix_dessa_tmps) */
		from_reg = from ? ctx->regs[phi][k] : ctx->regs[ref][2]; /* temporary register for fp swap (see ir_fix_dessa_tmps) */
		if (from_reg != IR_REG_NONE && (from_reg & IR_REG_SPILL_LOAD)) {
			from_reg &= ~IR_REG_SPILL_LOAD;
			ir_emit_load(ctx, type, from_reg, from);
		}
		if (to_reg != IR_REG_NONE && (to_reg & IR_REG_SPILL_STORE)) {
			to_reg &= ~IR_REG_SPILL_STORE;
			spill_store = 1;
		}
		if (from_reg != IR_REG_NONE && to_reg != IR_REG_NONE) {
			if (from_reg != to_reg) {
				ir_emit_fp_mov(ctx, type, to_reg, from_reg);
			}
		} else if (to_reg != IR_REG_NONE) {
			ir_emit_load(ctx, type, to_reg, from);
		} else if (from_reg != IR_REG_NONE) {
			ir_emit_store(ctx, type, to, from_reg);
		} else if (IR_IS_CONST_REF(from) || !ir_is_same_mem(ctx, from, to)) {
			from_reg = ctx->regs[ref][3]; /* temporary register for fp mem->mem (see ir_fix_dessa_tmps) */
			IR_ASSERT(from_reg != IR_REG_NONE);
			ir_emit_load(ctx, type, from_reg, from);
			ir_emit_store(ctx, type, to, from_reg);
		}
		if (spill_store) {
			ir_emit_store(ctx, type, to, to_reg);
		}
	}
	return 1;
}

static void ir_emit_param_move(ir_ctx *ctx, uint8_t type, ir_reg from_reg, ir_reg to_reg, ir_ref to, int32_t offset)
{
	ir_reg fp = (ctx->flags & IR_USE_FRAME_POINTER) ? IR_REG_FRAME_POINTER : IR_REG_STACK_POINTER;

	IR_ASSERT(from_reg != IR_REG_NONE || to_reg != IR_REG_NONE);

	if (IR_IS_TYPE_INT(type)) {
		if (from_reg != IR_REG_NONE) {
			if (to_reg != IR_REG_NONE) {
				ir_emit_mov(ctx, type, to_reg, from_reg);
			} else {
				ir_emit_store(ctx, type, to, from_reg);
			}
		} else {
			ir_emit_load_mem_int(ctx, type, to_reg, fp, offset);
		}
	} else {
		if (from_reg != IR_REG_NONE) {
			if (to_reg != IR_REG_NONE) {
				ir_emit_fp_mov(ctx, type, to_reg, from_reg);
			} else {
				ir_emit_store(ctx, type, to, from_reg);
			}
		} else {
			ir_emit_load_mem_fp(ctx, type, to_reg, fp, offset);
		}
	}
}

static void ir_emit_load_params(ir_ctx *ctx)
{
	ir_backend_data *data = ctx->data;
	ir_use_list *use_list = &ctx->use_lists[1];
	ir_insn *insn;
	ir_ref i, n, *p, use;
	int int_param_num = 0;
	int fp_param_num = 0;
	ir_reg src_reg;
	ir_reg dst_reg;
	// TODO: Calling convention specific
	int int_reg_params_count = IR_REG_INT_ARGS;
	int fp_reg_params_count = IR_REG_FP_ARGS;
	const int8_t *int_reg_params = _ir_int_reg_params;
	const int8_t *fp_reg_params = _ir_fp_reg_params;
	int32_t stack_offset = 0;

	if (ctx->flags & IR_USE_FRAME_POINTER) {
		stack_offset = sizeof(void*) * 2; /* skip old frame pointer and return address */
	} else {
		stack_offset = sizeof(void*) + data->ra_data.stack_frame_size + data->call_stack_size; /* skip return address */
	}
	n = use_list->count;
	for (i = 0, p = &ctx->use_edges[use_list->refs]; i < n; i++, p++) {
		use = *p;
		insn = &ctx->ir_base[use];
		if (insn->op == IR_PARAM) {
			if (IR_IS_TYPE_INT(insn->type)) {
				if (int_param_num < int_reg_params_count) {
					src_reg = int_reg_params[int_param_num];
				} else {
					src_reg = IR_REG_NONE;
				}
				int_param_num++;
			} else {
				if (fp_param_num < fp_reg_params_count) {
					src_reg = fp_reg_params[fp_param_num];
				} else {
					src_reg = IR_REG_NONE;
				}
				fp_param_num++;
			}
			if (ctx->vregs[use]) {
				dst_reg = IR_REG_NUM(ctx->regs[use][0]);
				IR_ASSERT(src_reg != IR_REG_NONE || dst_reg != IR_REG_NONE ||
					stack_offset == ctx->live_intervals[ctx->vregs[use]]->stack_spill_pos +
						((ctx->flags & IR_USE_FRAME_POINTER) ? -data->ra_data.stack_frame_size : data->call_stack_size));
				if (src_reg != dst_reg) {
					ir_emit_param_move(ctx, insn->type, src_reg, dst_reg, use, stack_offset);
				}
				if (dst_reg != IR_REG_NONE && (ctx->regs[use][0] & IR_REG_SPILL_STORE)) {
					ir_emit_store(ctx, insn->type, use, dst_reg);
				}
			}
			if (src_reg == IR_REG_NONE) {
				if (sizeof(void*) == 8) {
					stack_offset += sizeof(void*);
				} else {
					stack_offset += IR_MAX(sizeof(void*), ir_type_size[insn->type]);
				}
			}
		}
	}
}

static ir_reg ir_get_free_reg(ir_type type, ir_regset available)
{
	if (IR_IS_TYPE_INT(type)) {
		available = IR_REGSET_INTERSECTION(available, IR_REGSET_GP);
	} else {
		IR_ASSERT(IR_IS_TYPE_FP(type));
		available = IR_REGSET_INTERSECTION(available, IR_REGSET_FP);
	}
	IR_ASSERT(!IR_REGSET_IS_EMPTY(available));
	return IR_REGSET_FIRST(available);
}

static int ir_fix_dessa_tmps(ir_ctx *ctx, uint8_t type, ir_ref from, ir_ref to)
{
	ir_backend_data *data = ctx->data;
	ir_ref ref = ctx->cfg_blocks[data->dessa_from_block].end;

	if (to == 0) {
		if (IR_IS_TYPE_INT(type)) {
			if (ctx->regs[ref][0] == IR_REG_NONE) {
				ctx->regs[ref][0] = ctx->regs[ref][1] != IR_REG_X0 ? IR_REG_X0 : IR_REG_X1; //???
			}
		} else if (IR_IS_TYPE_FP(type)) {
			if (ctx->regs[ref][2] == IR_REG_NONE) {
				ctx->regs[ref][2] = ctx->regs[ref][3] != IR_REG_V0 ? IR_REG_V0 : IR_REG_V1; //???
			}
		} else {
			IR_ASSERT(0);
			return 0;
		}
	} else if (from != 0) {
		if (IR_IS_TYPE_INT(type)) {
			if (ctx->regs[ref][1] == IR_REG_NONE) {
				ctx->regs[ref][1] = ctx->regs[ref][0] != IR_REG_X0 ? IR_REG_X0 : IR_REG_X1; //???
			}
		} else if (IR_IS_TYPE_FP(type)) {
			if (ctx->regs[ref][3] == IR_REG_NONE) {
				ctx->regs[ref][3] = ctx->regs[ref][2] != IR_REG_V0 ? IR_REG_V0 : IR_REG_V1; //???
			}
		} else {
			IR_ASSERT(0);
			return 0;
		}
	}
	return 1;
}

static void ir_fix_param_spills(ir_ctx *ctx)
{
	ir_backend_data *data = ctx->data;
	ir_use_list *use_list = &ctx->use_lists[1];
	ir_insn *insn;
	ir_ref i, n, *p, use;
	int int_param_num = 0;
	int fp_param_num = 0;
	ir_reg src_reg;
	// TODO: Calling convention specific
	int int_reg_params_count = IR_REG_INT_ARGS;
	int fp_reg_params_count = IR_REG_FP_ARGS;
	const int8_t *int_reg_params = _ir_int_reg_params;
	const int8_t *fp_reg_params = _ir_fp_reg_params;
	int32_t stack_offset = 0;

	if (ctx->flags & IR_USE_FRAME_POINTER) {
		/* skip old frame pointer and return address */
		stack_offset = sizeof(void*) * 2 + (data->ra_data.stack_frame_size - data->stack_frame_alignment);
	} else {
		 /* skip return address */
		stack_offset = sizeof(void*) + data->ra_data.stack_frame_size;
	}
	n = use_list->count;
	for (i = 0, p = &ctx->use_edges[use_list->refs]; i < n; i++, p++) {
		use = *p;
		insn = &ctx->ir_base[use];
		if (insn->op == IR_PARAM) {
			if (IR_IS_TYPE_INT(insn->type)) {
				if (int_param_num < int_reg_params_count) {
					src_reg = int_reg_params[int_param_num];
				} else {
					src_reg = IR_REG_NONE;
				}
				int_param_num++;
			} else {
				if (fp_param_num < fp_reg_params_count) {
					src_reg = fp_reg_params[fp_param_num];
				} else {
					src_reg = IR_REG_NONE;
				}
				fp_param_num++;
			}
			if (src_reg == IR_REG_NONE) {
				if (ctx->vregs[use]) {
					ir_live_interval *ival = ctx->live_intervals[ctx->vregs[use]];
					if ((ival->flags & IR_LIVE_INTERVAL_MEM_PARAM)
					 && ival->stack_spill_pos == -1
					 && (ival->next || ival->reg == IR_REG_NONE)) {
						ival->stack_spill_pos = stack_offset;
						ctx->regs[use][0] = IR_REG_NONE;
					}
				}
				if (sizeof(void*) == 8) {
					stack_offset += sizeof(void*);
				} else {
					stack_offset += IR_MAX(sizeof(void*), ir_type_size[insn->type]);
				}
			}
		}
	}
}

static void ir_allocate_unique_spill_slots(ir_ctx *ctx)
{
	int b;
	ir_block *bb;
	ir_insn *insn;
	ir_ref i, n, j, *p;
	uint32_t flags, *rule, insn_flags;
	ir_backend_data *data = ctx->data;
	ir_regset available = 0;
	ir_tmp_reg tmp_regs[4];
	uint8_t def_flags;

	ctx->regs = ir_mem_malloc(sizeof(ir_regs) * ctx->insns_count);
	memset(ctx->regs, IR_REG_NONE, sizeof(ir_regs) * ctx->insns_count);

	ctx->live_intervals = ir_mem_calloc(ctx->vregs_count + 1 + IR_REG_NUM, sizeof(ir_live_interval*));
	for (b = 1, bb = ctx->cfg_blocks + b; b <= ctx->cfg_blocks_count; b++, bb++) {
		bb->flags &= ~IR_BB_MAY_SKIP;
		flags = IR_BB_MAY_SKIP;
		if (bb->successors_count != 1 ||
		    ctx->cfg_edges[bb->successors] != b + 1 ||
		    (bb->flags & IR_BB_DESSA_MOVES)) {
			flags = 0;
		}
		for (i = bb->start, insn = ctx->ir_base + i, rule = ctx->rules + i; i <= bb->end;) {
			switch (ctx->rules ? *rule : insn->op) {
				case IR_START:
				case IR_BEGIN:
				case IR_END:
				case IR_IF_TRUE:
				case IR_IF_FALSE:
				case IR_CASE_VAL:
				case IR_CASE_DEFAULT:
				case IR_MERGE:
				case IR_LOOP_BEGIN:
				case IR_LOOP_END:
				case IR_LOOP_EXIT:
					break;
				default:
					flags = 0;
				case IR_VAR:
				case IR_SKIP:
				case IR_SKIP_REG: /* PARAM PHI PI */
					/* skip */
					def_flags = ir_get_def_flags(ctx, i);
					if (ctx->rules && *rule != IR_CMP_AND_BRANCH_INT && *rule != IR_CMP_AND_BRANCH_FP) {
						available = IR_REGSET_SCRATCH;
					}
					if (ctx->vregs[i]) {
						ir_reg reg = ir_uses_fixed_reg(ctx, i, 0);

						if (reg != IR_REG_NONE && IR_REGSET_IN(available, reg)) {
							IR_REGSET_EXCL(available, reg);
							ctx->regs[i][0] = reg | IR_REG_SPILL_STORE;
						} else if (def_flags & IR_USE_MUST_BE_IN_REG) {
							if (insn->op == IR_VLOAD
							 && ctx->live_intervals[ctx->vregs[i]]
							 && ctx->live_intervals[ctx->vregs[i]]->stack_spill_pos != -1) {
								/* pass */
							} else if (insn->op != IR_PARAM) {
								reg = ir_get_free_reg(insn->type, available);
								IR_REGSET_EXCL(available, reg);
								ctx->regs[i][0] = reg | IR_REG_SPILL_STORE;
							}
						}
						if (!ctx->live_intervals[ctx->vregs[i]]) {
							ir_live_interval *ival = ir_mem_calloc(1, sizeof(ir_live_interval));
							ctx->live_intervals[ctx->vregs[i]] = ival;
							ival->type = insn->type;
							ival->reg = IR_REG_NONE;
							ival->vreg = ctx->vregs[i];
							ival->stack_spill_pos = -1;
							if (insn->op == IR_PARAM && reg == IR_REG_NONE) {
								ival->flags |= IR_LIVE_INTERVAL_MEM_PARAM;
							} else {
								ival->stack_spill_pos = ir_allocate_spill_slot(ctx, ival->type, &data->ra_data);
							}
							ival->top = ival;
							if (insn->op == IR_VAR) {
								ir_use_list *use_list = &ctx->use_lists[i];
								ir_ref i, n, *p, use;
								ir_insn *use_insn;
								int32_t stack_spill_pos = ival->stack_spill_pos;

								n = use_list->count;
								for (i = 0, p = &ctx->use_edges[use_list->refs]; i < n; i++, p++) {
									use = *p;
									use_insn = &ctx->ir_base[use];
									if (use_insn->op == IR_VLOAD) {
										if (ctx->vregs[use]
										 && !ctx->live_intervals[ctx->vregs[use]]) {
											ir_live_interval *ival = ir_mem_calloc(1, sizeof(ir_live_interval));
											ctx->live_intervals[ctx->vregs[use]] = ival;
											ival->type = insn->type;
											ival->reg = IR_REG_NONE;
											ival->vreg = ctx->vregs[use];
											ival->stack_spill_pos = stack_spill_pos;
											ival->top = ival;
										}
									} else if (use_insn->op == IR_VSTORE) {
										if (!IR_IS_CONST_REF(use_insn->op3)
										 && ctx->vregs[use_insn->op3]
										 && !ctx->live_intervals[ctx->vregs[use_insn->op3]]) {
											ir_live_interval *ival = ir_mem_calloc(1, sizeof(ir_live_interval));
											ctx->live_intervals[ctx->vregs[use_insn->op3]] = ival;
											ival->type = insn->type;
											ival->reg = IR_REG_NONE;
											ival->vreg = ctx->vregs[insn->op3];
											ival->stack_spill_pos = stack_spill_pos;
											ival->top = ival;
										}
									}
								}
							}
						} else if (insn->op == IR_PARAM) {
							IR_ASSERT(0 && "unexpected PARAM");
							return;
						}
					}

					insn_flags = ir_op_flags[insn->op];
					n = ir_input_edges_count(ctx, insn);
					if (n > 0) {
						ir_live_pos start, end;
						ir_regset scratch = ir_get_scratch_regset(ctx, i, &start, &end);

						if (!IR_REGSET_IS_EMPTY(scratch) && start == IR_LOAD_SUB_REF) {
							available = IR_REGSET_DIFFERENCE(available, scratch);
						}
					}
					for (j = 1, p = insn->ops + 1; j <= n; j++, p++) {
						ir_ref input = *p;
						if (IR_OPND_KIND(insn_flags, j) == IR_OPND_DATA && input > 0 && ctx->vregs[input]) {
							if ((def_flags & IR_DEF_REUSES_OP1_REG) && j == 1) {
								ir_reg reg = ctx->regs[i][0] & ~IR_REG_SPILL_STORE;
								ctx->regs[i][1] = reg | IR_REG_SPILL_LOAD;
							} else {
								ir_reg reg = ir_uses_fixed_reg(ctx, i, j);

								if (reg != IR_REG_NONE && IR_REGSET_IN(available, reg)) {
									IR_REGSET_EXCL(available, reg);
									ctx->regs[i][j] = reg | IR_REG_SPILL_LOAD;
								} else if (ir_get_use_flags(ctx, i, j) & IR_USE_MUST_BE_IN_REG) {
									reg = ir_get_free_reg(ctx->ir_base[input].type, available);
									IR_REGSET_EXCL(available, reg);
									ctx->regs[i][j] = reg | IR_REG_SPILL_LOAD;
								} else if (j > 1 && input == insn->op1 && ctx->regs[i][1] != IR_REG_NONE) {
									ctx->regs[i][j] = ctx->regs[i][1];
								}
							}
						}
					}

					n = ir_get_temporary_regs(ctx, i, tmp_regs);
					if (n) {
						ir_reg reg;

						do {
							n--;
							reg = ir_get_free_reg(tmp_regs[n].type, available);
							IR_REGSET_EXCL(available, reg);
							ctx->regs[i][tmp_regs[n].num] = reg;
						} while (n);
					}
					break;
			}
			n = ir_operands_count(ctx, insn);
			n = 1 + (n >> 2); // support for multi-word instructions like MERGE and PHI
			i += n;
			insn += n;
			rule += n;
		}
		bb->flags |= flags;
		if (bb->flags & IR_BB_DESSA_MOVES) {
			data->dessa_from_block = b;
			ir_gen_dessa_moves(ctx, b, ir_fix_dessa_tmps);
		}
	}

	if (ctx->flags & IR_HAS_CALLS) {
		ctx->flags |= IR_USE_FRAME_POINTER;
		/* Stack must be 16 byte aligned */
		if (ctx->flags & IR_USE_FRAME_POINTER) {
			while (IR_ALIGNED_SIZE(data->ra_data.stack_frame_size + sizeof(void*) * 2, 16) != data->ra_data.stack_frame_size + sizeof(void*) * 2) {
				data->ra_data.stack_frame_size += sizeof(void*);
				data->stack_frame_alignment += sizeof(void*);
			}
		} else {
			while (IR_ALIGNED_SIZE(data->ra_data.stack_frame_size + sizeof(void*), 16) != data->ra_data.stack_frame_size + sizeof(void*)) {
				data->ra_data.stack_frame_size += sizeof(void*);
				data->stack_frame_alignment += sizeof(void*);
			}
		}
	}

	ir_fix_param_spills(ctx);
}

static void ir_mark_empty_blocks(ir_ctx *ctx)
{
	int b;
	ir_block *bb;
	ir_insn *insn;
	ir_ref i, n;
	uint32_t flags, *rule;

	for (b = 1, bb = ctx->cfg_blocks + b; b <= ctx->cfg_blocks_count; b++, bb++) {
		bb->flags &= ~IR_BB_MAY_SKIP;
		if (bb->successors_count == 1
		 && ctx->cfg_edges[bb->successors] == b + 1
		 && !(bb->flags & IR_BB_DESSA_MOVES)) {
			flags = IR_BB_MAY_SKIP;
			for (i = bb->start, insn = ctx->ir_base + i, rule = ctx->rules + i; i < bb->end;) {
				if (*rule != IR_SKIP && *rule != IR_SKIP_REG) {
					flags = 0;
					break;
				}
				n = ir_operands_count(ctx, insn);
				n = 1 + (n >> 2); // support for multi-word instructions like MERGE and PHI
				i += n;
				insn += n;
				rule += n;
			}
			bb->flags |= flags;
		}
	}
}

static void ir_preallocate_call_stack(ir_ctx *ctx, ir_backend_data *data)
{
	int call_stack_size, peak_call_stack_size = 0;
	ir_ref i, n;
	ir_insn *insn;

	for (i = 1, insn = ctx->ir_base + 1; i < ctx->insns_count;) {
		if (insn->op == IR_CALL) {
			call_stack_size = ir_call_used_stack(ctx, insn, 0);
			if (call_stack_size > peak_call_stack_size) {
				peak_call_stack_size = call_stack_size;
			}
		}
		n = ir_operands_count(ctx, insn);
		n = 1 + (n >> 2); // support for multi-word instructions like MERGE and PHI
		i += n;
		insn += n;
	}
	data->call_stack_size = peak_call_stack_size;
	ctx->flags |= IR_PREALLOCATED_STACK;
}

static void ir_calc_stack_frame_size(ir_ctx *ctx, ir_backend_data *data)
{
	int i;
	ir_live_interval **p, *ival;
	uint32_t additional_size = 0;

	for (i = 1, p = ctx->live_intervals + i; i <= ctx->vregs_count; i++, p++) {
		ival = *p;
		if (ival) {
			if (ival->stack_spill_pos != -1) {
				if (ival->stack_spill_pos + ir_type_size[ival->type] > data->ra_data.stack_frame_size) {
					data->ra_data.stack_frame_size = ival->stack_spill_pos + ir_type_size[ival->type];
				}
			}
			if (ival->reg != IR_REG_NONE) {
				if (!IR_REGSET_IN(data->used_preserved_regs, ival->reg)
				 && IR_REGSET_IN(IR_REGSET_PRESERVED, ival->reg)) {
					IR_REGSET_INCL(data->used_preserved_regs, ival->reg);
					additional_size += sizeof(void*);
				}
			}
		}
	}

	ival = ctx->live_intervals[0];
	while (ival) {
		if (ival->reg != IR_REG_NONE) {
			if (!IR_REGSET_IN(data->used_preserved_regs, ival->reg)
			 && IR_REGSET_IN(IR_REGSET_PRESERVED, ival->reg)) {
				IR_REGSET_INCL(data->used_preserved_regs, ival->reg);
				additional_size += sizeof(void*);
			}
		}
		ival = ival->next;
	}

	data->ra_data.stack_frame_size = IR_ALIGNED_SIZE(data->ra_data.stack_frame_size, sizeof(void*));
	data->ra_data.stack_frame_size += additional_size;

	if (ctx->flags & IR_HAS_CALLS) {
		ctx->flags |= IR_USE_FRAME_POINTER;
		/* Stack must be 16 byte aligned */
		if (ctx->flags & IR_USE_FRAME_POINTER) {
			while (IR_ALIGNED_SIZE(data->ra_data.stack_frame_size + sizeof(void*) * 2, 16) != data->ra_data.stack_frame_size + sizeof(void*) * 2) {
				data->ra_data.stack_frame_size += sizeof(void*);
				data->stack_frame_alignment += sizeof(void*);
			}
		} else {
			ir_preallocate_call_stack(ctx, data);
			while (IR_ALIGNED_SIZE(data->ra_data.stack_frame_size + data->call_stack_size + sizeof(void*), 16) !=
					data->ra_data.stack_frame_size + data->call_stack_size + sizeof(void*)) {
				data->ra_data.stack_frame_size += sizeof(void*);
				data->stack_frame_alignment += sizeof(void*);
			}
		}
	}

	ir_fix_param_spills(ctx);
}

static void* dasm_labels[ir_lb_MAX];

void *ir_emit_code(ir_ctx *ctx, size_t *size)
{
	int b, n, target;
	ir_block *bb;
	ir_ref i;
	ir_insn *insn;
	uint32_t *rule;
	ir_backend_data data;
	dasm_State **Dst;
	int ret;
	void *entry;

	ctx->data = &data;
	data.ra_data.stack_frame_size = 0;
	data.ra_data.unused_slot_4 = 0;
	data.ra_data.unused_slot_2 = 0;
	data.ra_data.unused_slot_1 = 0;
	data.stack_frame_alignment = 0;
	data.call_stack_size = 0;
	data.used_preserved_regs = 0;
	data.rodata_label = 0;
	data.jmp_table_label = 0;

	if (!ctx->live_intervals) {
		ir_allocate_unique_spill_slots(ctx);
	} else {
		ir_mark_empty_blocks(ctx);
		ir_calc_stack_frame_size(ctx, &data);
	}

	Dst = &data.dasm_state;
	data.dasm_state = NULL;
	dasm_init(&data.dasm_state, DASM_MAXSECTION);
	dasm_setupglobal(&data.dasm_state, dasm_labels, ir_lb_MAX);
	dasm_setup(&data.dasm_state, dasm_actions);
	dasm_growpc(&data.dasm_state, ctx->cfg_blocks_count + 1 + ctx->consts_count + 1 + 1 + 1);

	if (ctx->flags & IR_FUNCTION) {
		ir_emit_prologue(ctx);
		ir_emit_load_params(ctx);
	}

	for (b = 1, bb = ctx->cfg_blocks + b; b <= ctx->cfg_blocks_count; b++, bb++) {
//		if (bb->flags & IR_BB_MAY_SKIP) {
//			continue;
//		}
//		if (ir_needs_block_label(ctx, b)) {
			|=>b:
//		}
		for (i = bb->start, insn = ctx->ir_base + i, rule = ctx->rules + i; i <= bb->end;) {
			switch (*rule) {
				case IR_SKIP:
				case IR_SKIP_REG:
//???				case IR_SKIP_BINOP_INT:
//???				case IR_SKIP_SHIFT:
				case IR_VAR:
					break;
				case IR_MUL_PWR2:
				case IR_DIV_PWR2:
				case IR_MOD_PWR2:
					ir_emit_mul_div_mod_pwr2(ctx, i, insn);
					break;
				case IR_SHIFT:
					ir_emit_shift(ctx, i, insn);
					break;
				case IR_SHIFT_CONST:
					ir_emit_shift_const(ctx, i, insn);
					break;
				case IR_OP_INT:
					ir_emit_op_int(ctx, i, insn);
					break;
				case IR_OP_FP:
					ir_emit_op_fp(ctx, i, insn);
					break;
				case IR_BINOP_INT:
					ir_emit_binop_int(ctx, i, insn);
					break;
				case IR_BINOP_FP:
					ir_emit_binop_fp(ctx, i, insn);
					break;
				case IR_CMP_INT:
					ir_emit_cmp_int(ctx, i, insn);
					break;
				case IR_CMP_FP:
					ir_emit_cmp_fp(ctx, i, insn);
					break;
				case IR_SEXT:
					ir_emit_sext(ctx, i, insn);
					break;
				case IR_ZEXT:
					ir_emit_zext(ctx, i, insn);
					break;
				case IR_TRUNC:
					ir_emit_trunc(ctx, i, insn);
					break;
				case IR_BITCAST:
					ir_emit_bitcast(ctx, i, insn);
					break;
				case IR_INT2FP:
					ir_emit_int2fp(ctx, i, insn);
					break;
				case IR_FP2INT:
					ir_emit_fp2int(ctx, i, insn);
					break;
				case IR_FP2FP:
					ir_emit_fp2fp(ctx, i, insn);
					break;
				case IR_COPY_INT:
					ir_emit_copy_int(ctx, i, insn);
					break;
				case IR_COPY_FP:
					ir_emit_copy_fp(ctx, i, insn);
					break;
				case IR_CMP_AND_BRANCH_INT:
					ir_emit_cmp_and_branch_int(ctx, b, i, insn);
					break;
				case IR_CMP_AND_BRANCH_FP:
					ir_emit_cmp_and_branch_fp(ctx, b, i, insn);
					break;
				case IR_IF_INT:
					ir_emit_if_int(ctx, b, i, insn);
					break;
				case IR_SWITCH:
					ir_emit_switch(ctx, b, i, insn);
					break;
				case IR_MIN_MAX_INT:
					ir_emit_min_max_int(ctx, i, insn);
					break;
				case IR_OVERFLOW:
					ir_emit_overflow(ctx, i, insn);
					break;
				case IR_OVERFLOW_AND_BRANCH:
					ir_emit_overflow_and_branch(ctx, b, i, insn);
					break;
				case IR_END:
				case IR_LOOP_END:
					if (bb->flags & IR_BB_DESSA_MOVES) {
						data.dessa_from_block = b;
						ir_gen_dessa_moves(ctx, b, ir_emit_dessa_move);
					}
					IR_ASSERT(bb->successors_count == 1);
					target = ir_skip_empty_blocks(ctx, ctx->cfg_edges[bb->successors]);
					if (b == ctx->cfg_blocks_count || target != ir_skip_empty_blocks(ctx, b + 1)) {
						|	b =>target
					}
					break;
				case IR_RETURN_VOID:
					ir_emit_return_void(ctx);
					break;
				case IR_RETURN_INT:
					ir_emit_return_int(ctx, i, insn);
					break;
				case IR_RETURN_FP:
					ir_emit_return_fp(ctx, i, insn);
					break;
				case IR_CALL:
					ir_emit_call(ctx, i, insn);
					break;
				case IR_TAILCALL:
					ir_emit_tailcall(ctx, i, insn);
					break;
				case IR_IJMP:
					ir_emit_ijmp(ctx, i, insn);
					break;
				case IR_VADDR:
					ir_emit_vaddr(ctx, i, insn);
					break;
				case IR_VLOAD_INT:
					ir_emit_vload_int(ctx, i, insn);
					break;
				case IR_VLOAD_FP:
					ir_emit_vload_fp(ctx, i, insn);
					break;
				case IR_VSTORE_INT:
					ir_emit_vstore_int(ctx, i, insn);
					break;
				case IR_VSTORE_FP:
					ir_emit_vstore_fp(ctx, i, insn);
					break;
				case IR_LOAD_INT:
					ir_emit_load_int(ctx, i, insn);
					break;
				case IR_LOAD_FP:
					ir_emit_load_fp(ctx, i, insn);
					break;
				case IR_STORE_INT:
					ir_emit_store_int(ctx, i, insn);
					break;
				case IR_STORE_FP:
					ir_emit_store_fp(ctx, i, insn);
					break;
				case IR_ALLOCA:
					ir_emit_alloca(ctx, i, insn);
					break;
				default:
					IR_ASSERT(0 && "NIY rule/insruction");
					break;
			}
			n = ir_operands_count(ctx, insn);
			n = 1 + (n >> 2); // support for multi-word instructions like MERGE and PHI
			i += n;
			insn += n;
			rule += n;
		}
	}

	if (data.rodata_label) {
		|.rodata
	}
	for (i = IR_UNUSED + 1, insn = ctx->ir_base - i; i < ctx->consts_count; i++, insn--) {
		if (insn->emit_const) {
			if (IR_IS_TYPE_FP(insn->type)) {
				int label = ctx->cfg_blocks_count + i;

				if (!data.rodata_label) {
					data.rodata_label = ctx->cfg_blocks_count + ctx->consts_count + 2;

					|.rodata
					|=>data.rodata_label:
				}
				if (insn->type == IR_DOUBLE) {
					|.align 8
					|=>label:
					|.long insn->val.u32, insn->val.u32_hi
				} else if (insn->type == IR_FLOAT) {
					|.align 4
					|=>label:
					|.long insn->val.u32
				} else {
					IR_ASSERT(0);
				}
			} else if (insn->op == IR_STR) {
				int label = ctx->cfg_blocks_count + i;
				const char *str = ir_get_str(ctx, insn->val.addr);
				int i = 0;

				if (!data.rodata_label) {
					data.rodata_label = ctx->cfg_blocks_count + ctx->consts_count + 2;

					|.rodata
					|=>data.rodata_label:
				}
				|.align 8
				|=>label:
				while (1) {
					char c;
					uint32_t w = 0;
					int j;

					for (j = 0; j < 4; j++) {
						c = str[i];
						if (!c) {
							break;
						} else if (c == '\\') {
							if (str[i+1] == '\\') {
								i++;
								c = '\\';
							} else if (str[i+1] == 'n') {
								i++;
								c = '\n';
							} else if (str[i+1] == 'r') {
								i++;
								c = '\r';
							} else if (str[i+1] == 't') {
								i++;
								c = '\t';
							}
						}
						w |= c << (8 * j);
						i++;
					}
					|	.long w
					if (!c) {
						break;
					}
				}

			} else {
				IR_ASSERT(0);
			}
		}
	}
	if (data.rodata_label) {
		|.code
	}

	ret = dasm_link(&data.dasm_state, size);
	if (ret != DASM_S_OK) {
		return 0;
	}

	entry = ir_mem_mmap(4096);
	ir_mem_unprotect(entry, 4096);

	ret = dasm_encode(&data.dasm_state, entry);

	if (data.jmp_table_label) {
		uint32_t offset = dasm_getpclabel(&data.dasm_state, data.jmp_table_label);
		ctx->jmp_table_offset = offset;
	} else {
		ctx->jmp_table_offset = 0;
	}
	if (data.rodata_label) {
		uint32_t offset = dasm_getpclabel(&data.dasm_state, data.rodata_label);
		ctx->rodata_offset = offset;
	} else {
		ctx->rodata_offset = 0;
	}

	if (ret != DASM_S_OK) {
		IR_ASSERT(0);
		ir_mem_unmap(entry, 4096);
		return NULL;
	}
	dasm_free(&data.dasm_state);

	ir_mem_flush(entry, 4096);
	ir_mem_protect(entry, 4096);

	return entry;
}