fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-05 09:38:07 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 2

r300: lower undefs to zero

Browse source 
They will get translated to read from random register otherwise, which is
not problematic per se, but they will not be regalloced and if the
initial register index was too high, we can fail the shader compilation
because we think we run out of registers.

Almost no effect with shader-db on RV530:
total instructions in shared programs: 130707 -> 130705 (<.01%)
instructions in affected programs: 1012 -> 1010 (-0.20%)
helped: 2
HURT: 1

Reviewed-by: Filip Gawin <filip.gawin@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23927>
This commit is contained in:
Pavel Ondračka 2023-06-23 14:30:44 +02:00 • committed by Marge Bot
parent ba83c1e254
commit 0bf6dcb785
1 changed files with 2 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/gallium/drivers/r300/compiler/r300_nir.c
View file

@ -96,6 +96,8 @@ r300_optimize_nir(struct nir_shader *s, struct pipe_screen *screen)
NIR_PASS(progress, s, nir_opt_trivial_continues);
NIR_PASS(progress, s, nir_opt_vectorize, r300_should_vectorize_instr, NULL);
NIR_PASS(progress, s, nir_opt_undef);
if(!progress)
NIR_PASS(progress, s, nir_lower_undef_to_zero);
NIR_PASS(progress, s, nir_opt_loop_unroll);
/* Try to fold addressing math into ubo_vec4's base to avoid load_consts