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nir/opt_intrinsics: optimize inot(inverse_ballot(const))

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No fossil-db changes.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38262>
This commit is contained in:
Rhys Perry 2026-01-06 11:33:49 +00:00 • committed by Marge Bot
parent f81aaee7f1
commit c0143829f9
1 changed files with 23 additions and 0 deletions
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23
src/compiler/nir/nir_opt_intrinsics.c
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@ -230,6 +230,25 @@ try_opt_quad_vote(nir_builder *b, nir_alu_instr *alu, bool block_has_discard)
return nir_quad_vote_any(b, 1, quad_broadcasts[0]->src[0].ssa);
}
static bool
try_opt_inot_inverse_ballot(nir_builder *b, nir_alu_instr *alu)
{
if (alu->def.bit_size != 1 ||
!nir_src_is_intrinsic(alu->src[0].src) ||
!list_is_singular(&alu->src[0].src.ssa->uses))
return false;
nir_intrinsic_instr *intrin = nir_src_as_intrinsic(alu->src[0].src);
if (intrin->intrinsic != nir_intrinsic_inverse_ballot || !nir_src_is_const(intrin->src[0]))
return false;
alu->op = nir_op_mov;
b->cursor = nir_before_instr(&intrin->instr);
nir_src_rewrite(&intrin->src[0], nir_inot(b, intrin->src[0].ssa));
return true;
}
static bool
opt_intrinsics_alu(nir_builder *b, nir_alu_instr *alu, bool block_has_discard)
{
@ -246,6 +265,10 @@ opt_intrinsics_alu(nir_builder *b, nir_alu_instr *alu, bool block_has_discard)
if (alu->def.bit_size == 1 && b->shader->options->optimize_quad_vote_to_reduce)
replacement = try_opt_quad_vote(b, alu, block_has_discard);
break;
case nir_op_inot:
if (try_opt_inot_inverse_ballot(b, alu))
return true;
break;
default:
break;
}