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Don't move conditions of IF and GUARDs out of loops

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This commit is contained in:
Dmitry Stogov 2023-05-30 15:10:23 +03:00
parent b560ddc8f6
commit 38ee633419
1 changed files with 18 additions and 4 deletions
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22
ir_gcm.c
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@ -80,9 +80,11 @@ static void ir_gcm_schedule_late(ir_ctx *ctx, uint32_t *_blocks, ir_bitset visit
{
ir_ref n, *p, use;
ir_insn *insn;
ir_use_list *use_list;
ir_bitset_incl(visited, ref);
n = ctx->use_lists[ref].count;
use_list = &ctx->use_lists[ref];
n = use_list->count;
if (n) {
uint32_t lca, b;
@ -91,7 +93,7 @@ static void ir_gcm_schedule_late(ir_ctx *ctx, uint32_t *_blocks, ir_bitset visit
IR_ASSERT(insn->op != IR_PHI && insn->op != IR_PI);
lca = 0;
for (p = &ctx->use_edges[ctx->use_lists[ref].refs]; n > 0; p++, n--) {
for (p = &ctx->use_edges[use_list->refs]; n > 0; p++, n--) {
use = *p;
b = _blocks[use];
if (!b) {
@ -124,9 +126,21 @@ static void ir_gcm_schedule_late(ir_ctx *ctx, uint32_t *_blocks, ir_bitset visit
ir_block *bb = &ctx->cfg_blocks[b];
uint32_t loop_depth = bb->loop_depth;
if (loop_depth) {
uint32_t flags = (bb->flags & IR_BB_LOOP_HEADER) ? bb->flags : ctx->cfg_blocks[bb->loop_header].flags;
if (loop_depth
&& !(ctx->binding && ir_binding_find(ctx, ref))) {
uint32_t flags;
use_list = &ctx->use_lists[ref];
if (use_list->count == 1) {
use = ctx->use_edges[use_list->refs];
insn = &ctx->ir_base[use];
if (insn->op == IR_IF || insn->op == IR_GUARD || insn->op == IR_GUARD_NOT) {
_blocks[ref] = b;
return;
}
}
flags = (bb->flags & IR_BB_LOOP_HEADER) ? bb->flags : ctx->cfg_blocks[bb->loop_header].flags;
if ((flags & IR_BB_LOOP_WITH_ENTRY)
&& !(ctx->binding && ir_binding_find(ctx, ref))) {
/* Don't move loop invariant code across an OSR ENTRY if we can't restore it */