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Add hints for passing arguments

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This commit is contained in:
Dmitry Stogov 2022-04-20 19:15:03 +03:00
parent ffdb53821d
commit a5054f4c31
1 changed files with 50 additions and 0 deletions
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50
ir_x86.dasc
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@ -824,6 +824,45 @@ static ir_reg ir_get_param_reg(ir_ctx *ctx, ir_ref ref)
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;
@ -855,6 +894,17 @@ ir_reg ir_uses_fixed_reg(ir_ctx *ctx, ir_ref ref, int op_num)
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_RAX;
} else {
return IR_REG_XMM0;
}
} else {
return ir_get_arg_reg(ctx, insn, op_num);
}
}
return IR_REG_NONE;
}