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nir/lower_blend: Optimize out PIPE_LOGICOP_NOOP

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Just drop the store. Written while debugging
dEQP-VK.pipeline.monolithic.logic_op.r8_uint.no_op.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Italo Nicola <italonicola@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24252>
This commit is contained in:
Alyssa Rosenzweig 2023-07-19 13:30:54 -04:00 • committed by Marge Bot
parent 9c0740211d
commit 6619317172
1 changed files with 4 additions and 2 deletions
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6
src/compiler/nir/nir_lower_blend.c
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@ -280,7 +280,7 @@ nir_logicop_func(
case PIPE_LOGICOP_EQUIV:
return nir_ixor(b, nir_ixor(b, src, dst), bitmask);
case PIPE_LOGICOP_NOOP:
return dst;
unreachable("optimized out");
case PIPE_LOGICOP_OR_INVERTED:
return nir_ior(b, nir_ixor(b, src, bitmask), dst);
case PIPE_LOGICOP_COPY:
@ -531,7 +531,9 @@ nir_lower_blend_instr(nir_builder *b, nir_instr *instr, void *data)
b->cursor = nir_after_block(instr->block);
/* Don't bother copying the destination to the source for disabled RTs */
if (options->rt[rt].colormask == 0) {
if (options->rt[rt].colormask == 0 ||
(options->logicop_enable && options->logicop_func == PIPE_LOGICOP_NOOP)) {
nir_instr_remove(instr);
return true;
}