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nir/subgroups: Lower clustered reductions with cluster_size >= subgroup_size into reductions

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The behavior for reductions with cluster_size >= subgroup_size is implementation defined.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Rhys Perry
2019-04-24 10:25:25 +01:00
committed by Daniel Schürmann
parent 911a1dfad2
commit 7b07034931
1 changed files with 12 additions and 1 deletions
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13
src/compiler/nir/nir_lower_subgroups.c
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@@ -479,7 +479,18 @@ lower_subgroups_instr(nir_builder *b, nir_instr *instr, void *_options)
return lower_subgroup_op_to_scalar(b, intrin, false);
break;
case nir_intrinsic_reduce:
case nir_intrinsic_reduce: {
nir_ssa_def *ret = NULL;
/* A cluster size greater than the subgroup size is implemention defined */
if (options->subgroup_size &&
nir_intrinsic_cluster_size(intrin) >= options->subgroup_size) {
nir_intrinsic_set_cluster_size(intrin, 0);
ret = NIR_LOWER_INSTR_PROGRESS;
}
if (options->lower_to_scalar && intrin->num_components > 1)
ret = lower_subgroup_op_to_scalar(b, intrin, false);
return ret;
}
case nir_intrinsic_inclusive_scan:
case nir_intrinsic_exclusive_scan:
if (options->lower_to_scalar && intrin->num_components > 1)