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jay: do not copyprop ballots globally

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Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41215>
This commit is contained in:
Alyssa Rosenzweig 2026-04-23 10:40:10 -04:00 • committed by Marge Bot
parent 5828b66b65
commit d7283a25d7
1 changed files with 9 additions and 2 deletions
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11
src/intel/compiler/jay/jay_opt_propagate.c
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@ -125,12 +125,14 @@ static void
propagate_forwards(jay_function *f)
{
jay_inst **defs = calloc(f->ssa_alloc, sizeof(defs[0]));
uint32_t *def_block = malloc(f->ssa_alloc * sizeof(def_block[0]));
jay_foreach_inst_in_func_safe(f, block, I) {
jay_builder b = jay_init_builder(f, jay_before_inst(I));
jay_foreach_dst_index(I, _, d) {
defs[d] = I;
def_block[d] = block->index;
}
/* Copy propagate individual components into vectors */
@ -167,14 +169,18 @@ propagate_forwards(jay_function *f)
if (def->op == JAY_OPCODE_MOV) {
/* Default values must have the same file as their dest, do not
* propagate invalid there. Also don't propagate inverse-ballots.
* Also only source 0 can read ARF (i.e. ballotted flags).
*
* For balloted flags, only source 0 can read ARF (i.e. ballotted
* flags). Furthermore, we may only propagate ballots locally as the
* ballot is implicitly execmask'd which changes throughout the CFG.
*/
if ((I->src[s].file == def->src[0].file) ||
((!jay_inst_has_default(I) ||
&I->src[s] != jay_inst_get_default(I)) &&
!(I->src[s].file == UFLAG && !jay_is_imm(def->src[0])) &&
!(I->src[s].file == FLAG) &&
(s == 0 || !jay_is_flag(def->src[0])) &&
(!jay_is_flag(def->src[0]) ||
(s == 0 && def_block[jay_base_index(src)] == block->index)) &&
!(jay_is_imm(def->src[0]) && I->src[s].negate))) {
jay_replace_src(&I->src[s], def->src[0]);
@ -199,6 +205,7 @@ propagate_forwards(jay_function *f)
}
free(defs);
free(def_block);
}
static bool