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nir: Add a lower_first_invocation_to_ballot option to lower_subgroups

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Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25894>
This commit is contained in:
Faith Ekstrand
2023-10-23 10:28:30 -05:00
committed by Marge Bot
parent d1d29d4f40
commit 3d027cca1e
2 changed files with 17 additions and 0 deletions
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1
src/compiler/nir/nir.h
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@@ -5527,6 +5527,7 @@ typedef struct nir_lower_subgroups_options {
bool lower_to_scalar : 1;
bool lower_vote_trivial : 1;
bool lower_vote_eq : 1;
bool lower_first_invocation_to_ballot : 1;
bool lower_subgroup_masks : 1;
bool lower_relative_shuffle : 1;
bool lower_shuffle_to_32bit : 1;

16
src/compiler/nir/nir_lower_subgroups.c
View File

@@ -549,6 +549,13 @@ lower_dynamic_quad_broadcast(nir_builder *b, nir_intrinsic_instr *intrin,
return dst;
}
static nir_def *
lower_first_invocation_to_ballot(nir_builder *b, nir_intrinsic_instr *intrin,
const nir_lower_subgroups_options *options)
{
return nir_ballot_find_lsb(b, 32, nir_ballot(b, 4, 32, nir_imm_true(b)));
}
static nir_def *
lower_read_invocation_to_cond(nir_builder *b, nir_intrinsic_instr *intrin)
{
@@ -588,6 +595,15 @@ lower_subgroups_instr(nir_builder *b, nir_instr *instr, void *_options)
return nir_imm_int(b, options->subgroup_size);
break;
case nir_intrinsic_first_invocation:
if (options->subgroup_size == 1)
return nir_imm_int(b, 0);
if (options->lower_first_invocation_to_ballot)
return lower_first_invocation_to_ballot(b, intrin, options);
break;
case nir_intrinsic_read_invocation:
if (options->lower_to_scalar && intrin->num_components > 1)
return lower_subgroup_op_to_scalar(b, intrin);