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Add code selection rule to fuse

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movq 0x60(%r14), %rax
    leaq -1(%rax), %rax
    movq %rax, 0x60(%r14)
    testq %rax, %rax
    jle jit$$trace_exit_1

into

    subq $1, 0x60(%r14)
    jle jit$$trace_exit_1"
This commit is contained in:
Dmitry Stogov 2023-05-10 18:22:03 +03:00
parent c6b5075733
commit 6f8aa7b540
1 changed files with 97 additions and 0 deletions
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97
ir_x86.dasc
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@ -489,6 +489,7 @@ enum _ir_rule {
IR_GUARD_CMP_INT,
IR_GUARD_CMP_FP,
IR_GUARD_TEST_INT,
IR_GUARD_JCC_INT,
IR_GUARD_OVERFLOW,
IR_OVERFLOW_AND_BRANCH,
IR_MIN_MAX_INT,
@ -1725,6 +1726,86 @@ store_int:
(insn->op2 == ctx->prev_ref[ref] - 1
&& ctx->ir_base[ctx->prev_ref[ref]].op == IR_SNAPSHOT))) {
if (IR_IS_TYPE_INT(ctx->ir_base[op2_insn->op1].type)) {
if (IR_IS_CONST_REF(op2_insn->op2)
&& ctx->ir_base[op2_insn->op2].val.i64 == 0) {
if (op2_insn->op1 == insn->op2 - 1) { /* previous instruction */
ir_insn *op1_insn = &ctx->ir_base[op2_insn->op1];
if (op1_insn->op == IR_ADD ||
op1_insn->op == IR_SUB ||
// op1_insn->op == IR_MUL ||
op1_insn->op == IR_OR ||
op1_insn->op == IR_AND ||
op1_insn->op == IR_XOR) {
if (ir_op_flags[op1_insn->op] & IR_OP_FLAG_COMMUTATIVE) {
ir_match_fuse_load_commutative_int(ctx, op1_insn, ref);
} else {
ir_match_fuse_load(ctx, op1_insn->op2, ref);
}
if (op1_insn->op == IR_AND && ctx->use_lists[op2_insn->op1].count == 1) {
/* v = AND(_, _); c = CMP(v, 0) ... IF(c) => SKIP_TEST; SKIP ... GUARD_TEST */
if (IR_IS_CONST_REF(op1_insn->op2)) {
ir_match_fuse_load(ctx, op1_insn->op1, ref);
}
ctx->rules[op2_insn->op1] = IR_FUSED | IR_TEST_INT;
ctx->rules[insn->op2] = IR_FUSED | IR_SIMPLE | IR_NOP;
return IR_GUARD_TEST_INT;
} else {
/* v = BINOP(_, _); c = CMP(v, 0) ... IF(c) => BINOP; SKIP_CMP ... GUARD_JCC */
ctx->rules[op2_insn->op1] = IR_BINOP_INT;
ctx->rules[insn->op2] = IR_FUSED | IR_CMP_INT;
return IR_GUARD_JCC_INT;
}
}
} else if ((ctx->flags & IR_OPT_CODEGEN)
&& op2_insn->op1 == insn->op2 - 2 /* before previous instruction */
&& ir_in_same_block(ctx, op2_insn->op1)
&& ctx->use_lists[op2_insn->op1].count == 2) {
ir_insn *store_insn = &ctx->ir_base[insn->op2 - 1];
if (store_insn->op == IR_STORE && store_insn->op3 == op2_insn->op1) {
ir_insn *op_insn = &ctx->ir_base[op2_insn->op1];
if (op_insn->op == IR_ADD ||
op_insn->op == IR_SUB ||
// op_insn->op == IR_MUL ||
op_insn->op == IR_OR ||
op_insn->op == IR_AND ||
op_insn->op == IR_XOR) {
if (ctx->ir_base[op_insn->op1].op == IR_LOAD
&& ctx->ir_base[op_insn->op1].op2 == store_insn->op2) {
if (ir_in_same_block(ctx, op_insn->op1)
&& ctx->use_lists[op_insn->op1].count == 2
&& store_insn->op1 == op_insn->op1) {
/* v = MEM_BINOP(_, _); IF(v) => MEM_BINOP; GUARD_JCC */
ctx->rules[op2_insn->op1] = IR_FUSED | IR_BINOP_INT;
ctx->rules[op_insn->op1] = IR_SKIPPED | IR_LOAD;
ir_match_fuse_addr(ctx, store_insn->op2);
ctx->rules[insn->op2 - 1] = IR_MEM_BINOP_INT;
ctx->rules[insn->op2] = IR_SKIPPED | IR_NOP;
return IR_GUARD_JCC_INT;
}
} else if ((ir_op_flags[op_insn->op] & IR_OP_FLAG_COMMUTATIVE)
&& ctx->ir_base[op_insn->op2].op == IR_LOAD
&& ctx->ir_base[op_insn->op2].op2 == store_insn->op2) {
if (ir_in_same_block(ctx, op_insn->op2)
&& ctx->use_lists[op_insn->op2].count == 2
&& store_insn->op1 == op_insn->op2) {
/* v = MEM_BINOP(_, _); IF(v) => MEM_BINOP; JCC */
ir_swap_ops(op_insn);
ctx->rules[op2_insn->op1] = IR_FUSED | IR_BINOP_INT;
ctx->rules[op_insn->op1] = IR_SKIPPED | IR_LOAD;
ir_match_fuse_addr(ctx, store_insn->op2);
ctx->rules[insn->op2 - 1] = IR_MEM_BINOP_INT;
ctx->rules[insn->op2] = IR_SKIPPED | IR_NOP;
return IR_GUARD_JCC_INT;
}
}
}
}
}
}
/* c = CMP(_, _) ... GUARD(c) => SKIP_CMP ... GUARD_CMP */
ir_match_fuse_load_cmp_int(ctx, op2_insn, ref);
ctx->rules[insn->op2] = IR_FUSED | IR_CMP_INT;
@ -6772,6 +6853,17 @@ static bool ir_emit_guard_test_int(ir_ctx *ctx, uint32_t b, ir_ref def, ir_insn
return ir_emit_guard_jcc(ctx, b, def, op, addr, 1);
}
static bool ir_emit_guard_jcc_int(ir_ctx *ctx, uint32_t b, ir_ref def, ir_insn *insn)
{
void *addr = ir_jmp_addr(ctx, insn, &ctx->ir_base[insn->op3]);
ir_op op = ctx->ir_base[insn->op2].op;
if (insn->op == IR_GUARD) {
op ^= 1; // reverse
}
return ir_emit_guard_jcc(ctx, b, def, op, addr, 1);
}
static bool ir_emit_guard_overflow(ir_ctx *ctx, uint32_t b, ir_ref def, ir_insn *insn)
{
ir_backend_data *data = ctx->data;
@ -8330,6 +8422,11 @@ void *ir_emit_code(ir_ctx *ctx, size_t *size_ptr)
goto next_block;
}
break;
case IR_GUARD_JCC_INT:
if (ir_emit_guard_jcc_int(ctx, b, i, insn)) {
goto next_block;
}
break;
case IR_IF_INT:
ir_emit_if_int(ctx, b, i, insn);
break;