fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-06-06 23:38:25 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

nir/divergence: Consider uniformity of read_invocation accross subgroups

Browse source 
These intrinsics are generally divergent between different
subgroups, but they can be uniform when all their sources
are also uniform.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41584>
This commit is contained in:
Timur Kristóf 2026-05-14 20:12:39 +02:00 • committed by Marge Bot
parent 5b385b703b
commit dd5b6f3940
1 changed files with 16 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
src/compiler/nir/nir_divergence_analysis.c
View file

@ -184,9 +184,6 @@ visit_intrinsic(nir_intrinsic_instr *instr, struct divergence_state *state)
case nir_intrinsic_shader_clock:
case nir_intrinsic_ballot:
case nir_intrinsic_ballot_relaxed:
case nir_intrinsic_as_uniform:
case nir_intrinsic_read_invocation:
case nir_intrinsic_read_first_invocation:
case nir_intrinsic_read_invocation_cond_ir3:
case nir_intrinsic_read_getlast_ir3:
case nir_intrinsic_vote_any:
@ -210,6 +207,22 @@ visit_intrinsic(nir_intrinsic_instr *instr, struct divergence_state *state)
(state->options & nir_divergence_across_subgroups);
break;
case nir_intrinsic_as_uniform:
case nir_intrinsic_read_invocation:
case nir_intrinsic_read_first_invocation:
is_divergent = false;
if ((state->options & nir_divergence_vertex) ||
(state->options & nir_divergence_across_subgroups)) {
/* These intrinsics are generally divergent between different
* subgroups, but they can be uniform when all their sources
* are also uniform.
*/
for (unsigned i = 0; i < nir_intrinsic_infos[instr->intrinsic].num_srcs; ++i)
is_divergent |= src_divergent(instr->src[i], state);
}
break;
/* Intrinsics which are always uniform */
case nir_intrinsic_load_preamble:
case nir_intrinsic_load_push_constant: