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Disable LICM for overflow checking math

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This commit is contained in:
Dmitry Stogov 2023-03-22 12:07:05 +03:00
parent b1f2167ea5
commit 83edc3f8a1
1 changed files with 23 additions and 10 deletions
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33
ir_gcm.c
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@ -117,20 +117,33 @@ static void ir_gcm_schedule_late(ir_ctx *ctx, uint32_t *_blocks, ir_bitset visit
}
IR_ASSERT(lca != 0 && "No Common Antecessor");
b = lca;
uint32_t loop_depth = ctx->cfg_blocks[b].loop_depth;
if (loop_depth) {
while (lca != ctx->cfg_blocks[_blocks[ref]].dom_parent) {
if (ctx->cfg_blocks[lca].loop_depth < loop_depth) {
loop_depth = ctx->cfg_blocks[lca].loop_depth;
b = lca;
if (!loop_depth) {
break;
if (b != _blocks[ref]) {
ir_block *bb = &ctx->cfg_blocks[b];
uint32_t loop_depth = bb->loop_depth;
if (loop_depth) {
insn = &ctx->ir_base[ref];
if (insn->op >= IR_ADD_OV && insn->op <= IR_OVERFLOW) {
/* Don't move overflow checking math out of the loop */
// TODO: this should be turned into a more general check to prohibit LICM ???
} else {
lca = bb->dom_parent;
while (lca != _blocks[ref]) {
bb = &ctx->cfg_blocks[lca];
if (bb->loop_depth < loop_depth) {
loop_depth = bb->loop_depth;
b = lca;
if (!loop_depth) {
break;
}
}
lca = bb->dom_parent;
}
}
lca = ctx->cfg_blocks[lca].dom_parent;
}
_blocks[ref] = b;
}
_blocks[ref] = b;
}
}