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nir/opt_undef: keep undefs used by partial undef vectors

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Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32249>
This commit is contained in:
Georg Lehmann 2024-11-20 17:26:22 +01:00 • committed by Marge Bot
parent a9d3caf3bf
commit af974b5fe9
1 changed files with 3 additions and 9 deletions
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12
src/compiler/nir/nir_opt_undef.c
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@ -181,15 +181,9 @@ visit_undef_use(nir_src *src, struct visit_info *info)
*/
nir_alu_instr *alu = nir_instr_as_alu(instr);
/* Follow movs and vecs.
*
* Note that all vector component uses are followed and swizzles are
* ignored.
*/
if (alu->op == nir_op_mov || nir_op_is_vec(alu->op)) {
nir_foreach_use_including_if(next_src, &alu->def) {
visit_undef_use(next_src, info);
}
/* opt_undef_vecN already copy propagated. */
if (nir_op_is_vec(alu->op)) {
info->must_keep_undef = true;
return;
}