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nir/source_mods: Add a helpers for setting source modifiers

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It's potentially a tiny bit less efficient but the helpers make it much
easier to sort out the rules for updating source modifiers.

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Jason Ekstrand 2019-05-06 15:30:36 -05:00
parent 8ffbb54405
commit 2a39788d03
1 changed files with 18 additions and 6 deletions
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24
src/compiler/nir/nir_lower_to_source_mods.c
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@ -33,6 +33,20 @@
* easier to not have them when we're doing optimizations.
*/
static void
alu_src_consume_abs(nir_alu_src *src)
{
src->abs = true;
}
static void
alu_src_consume_negate(nir_alu_src *src)
{
/* If abs is set on the source, the negate goes away */
if (!src->abs)
src->negate = !src->negate;
}
static bool
nir_lower_to_source_mods_block(nir_block *block,
nir_lower_to_source_mods_flags options)
@ -88,12 +102,10 @@ nir_lower_to_source_mods_block(nir_block *block,
continue;
nir_instr_rewrite_src(instr, &alu->src[i].src, parent->src[0].src);
if (alu->src[i].abs) {
/* abs trumps both neg and abs, do nothing */
} else {
alu->src[i].negate = (alu->src[i].negate != parent->src[0].negate);
alu->src[i].abs |= parent->src[0].abs;
}
if (parent->src[0].negate)
alu_src_consume_negate(&alu->src[i]);
if (parent->src[0].abs)
alu_src_consume_abs(&alu->src[i]);
for (int j = 0; j < 4; ++j) {
if (!nir_alu_instr_channel_used(alu, i, j))