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Check if the register is necessary at all

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This commit is contained in:
Dmitry Stogov 2022-10-18 22:02:09 +03:00
parent 1dcfe127e1
commit 22cd9265d3
1 changed files with 2 additions and 1 deletions
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3
ir_ra.c
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@ -913,13 +913,14 @@ static int ir_hint_conflict(ir_ctx *ctx, ir_ref ref, int use, int def)
static int ir_try_swap_operands(ir_ctx *ctx, ir_ref i, ir_insn *insn)
{
if (insn->op1 > 0
&& ctx->vregs[insn->op1]
&& ctx->vregs[insn->op1] != ctx->vregs[i]
&& !ir_vregs_overlap(ctx, ctx->vregs[insn->op1], ctx->vregs[i])
&& !ir_hint_conflict(ctx, i, ctx->vregs[insn->op1], ctx->vregs[i])) {
/* pass */
} else if (insn->op1 > 0 && insn->op2 > 0 && insn->op1 != insn->op2
&& (ir_op_flags[insn->op] & IR_OP_FLAG_COMMUTATIVE)) {
if (ctx->vregs[insn->op2] != ctx->vregs[i]) {
if (ctx->vregs[insn->op2] && ctx->vregs[insn->op2] != ctx->vregs[i]) {
ir_live_pos pos = IR_USE_LIVE_POS_FROM_REF(i);
ir_live_pos load_pos = IR_LOAD_LIVE_POS_FROM_REF(i);
ir_live_interval *ival = ctx->live_intervals[ctx->vregs[insn->op2]];