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intel/fs: prevent large vector ops generated by peephole_ffma

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Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21782>
This commit is contained in:
Lionel Landwerlin
2023-03-09 12:12:54 +02:00
committed by Marge Bot
parent bc08f43991
commit bf59cfcee1
1 changed files with 13 additions and 2 deletions
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15
src/intel/compiler/brw_nir.c
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@@ -1458,8 +1458,19 @@ brw_postprocess_nir(nir_shader *nir, const struct brw_compiler *compiler,
brw_nir_optimize(nir, compiler, is_scalar);
if (devinfo->ver >= 6) {
/* Try and fuse multiply-adds */
OPT(brw_nir_opt_peephole_ffma);
/* Try and fuse multiply-adds, if successful, run shrink_vectors to
* avoid peephole_ffma to generate things like this :
* vec16 ssa_0 = ...
* vec16 ssa_1 = fneg ssa_0
* vec1 ssa_2 = ffma ssa_1, ...
*
* We want this instead :
* vec16 ssa_0 = ...
* vec1 ssa_1 = fneg ssa_0.x
* vec1 ssa_2 = ffma ssa_1, ...
*/
if (OPT(brw_nir_opt_peephole_ffma))
OPT(nir_opt_shrink_vectors);
}
if (is_scalar)