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Traverse instruction backward (it's cheaper)

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This commit is contained in:
Dmitry Stogov 2022-11-23 15:48:22 +03:00
parent c5220fdf8d
commit bce0114bab
1 changed files with 6 additions and 12 deletions
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18
ir_ra.c
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@ -1081,16 +1081,13 @@ int ir_coalesce(ir_ctx *ctx)
for (b = 1, bb = &ctx->cfg_blocks[1]; b <= ctx->cfg_blocks_count; b++, bb++) {
ir_ref i;
i = bb->start;
i = bb->end;
/* skip first instruction */
insn = ctx->ir_base + i;
n = ir_operands_count(ctx, insn);
n = 1 + (n >> 2); // support for multi-word instructions like MERGE and PHI
i += n;
insn += n;
/* skip last instruction */
i = ctx->prev_ref[i];
while (i < bb->end) {
while (i != bb->start) {
insn = &ctx->ir_base[i];
if ((ir_op_flags[insn->op] & IR_OP_FLAG_COMMUTATIVE)
&& ctx->vregs[i]
&& ctx->live_intervals[ctx->vregs[i]]->use_pos
@ -1100,10 +1097,7 @@ int ir_coalesce(ir_ctx *ctx)
&& insn->op1 != insn->op2) {
ir_try_swap_operands(ctx, i, insn);
}
n = ir_operands_count(ctx, insn);
n = 1 + (n >> 2); // support for multi-word instructions like MERGE and PHI
i += n;
insn += n;
i = ctx->prev_ref[i];
}
}
}