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nir/lower_non_uniform: Use nir_read_first_invocation helper. 

We now have a general helper for this, and don't need to roll our own.

Suggested by Rhys Perry in the review for MR !7592.

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7592>
This commit is contained in:
Kenneth Graunke 2020-12-02 11:00:15 -08:00 committed by Marge Bot
parent 3abac03d49
commit 562e07db38
1 changed files with 2 additions and 16 deletions
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18
src/compiler/nir/nir_lower_non_uniform_access.c
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@ -24,20 +24,6 @@
#include "nir.h"
#include "nir_builder.h"
static nir_ssa_def *
read_first_invocation(nir_builder *b, nir_ssa_def *x)
{
nir_intrinsic_instr *first =
nir_intrinsic_instr_create(b->shader,
nir_intrinsic_read_first_invocation);
first->num_components = x->num_components;
first->src[0] = nir_src_for_ssa(x);
nir_ssa_dest_init(&first->instr, &first->dest,
x->num_components, x->bit_size, NULL);
nir_builder_instr_insert(b, &first->instr);
return &first->dest.ssa;
}
static bool
lower_non_uniform_tex_access(nir_builder *b, nir_tex_instr *tex)
{
@ -113,7 +99,7 @@ lower_non_uniform_tex_access(nir_builder *b, nir_tex_instr *tex)
nir_ssa_def *all_equal_first = nir_imm_true(b);
nir_ssa_def *first[2];
for (unsigned i = 0; i < handle_count; i++) {
first[i] = read_first_invocation(b, handles[i]);
first[i] = nir_read_first_invocation(b, handles[i]);
nir_ssa_def *equal_first = nir_ieq(b, first[i], handles[i]);
all_equal_first = nir_iand(b, all_equal_first, equal_first);
}
@ -173,7 +159,7 @@ lower_non_uniform_access_intrin(nir_builder *b, nir_intrinsic_instr *intrin,
assert(handle->num_components == 1);
nir_ssa_def *first = read_first_invocation(b, handle);
nir_ssa_def *first = nir_read_first_invocation(b, handle);
nir_push_if(b, nir_ieq(b, first, handle));
/* Replicate the deref. */