https://gcc.gnu.org/g:3b599593af17f61fc8cf26ccf1c7e3fd4e83b221
commit r15-9901-g3b599593af17f61fc8cf26ccf1c7e3fd4e83b221
Author: Richard Biener <rguent...@suse.de>
Date: Wed Jul 2 13:44:59 2025 +0200
Do not query further vector epilogues after a masked epilogue
When doing --param vect-partial-vector-usage=1 we'd continue querying
the target whether it wants more vector epilogues, but when it comes
back with a suggestion we then might iterate endlessly. Do not
even ask the target when we decided for the last epilogue to be
one with partial vectors.
PR tree-optimization/120927
* tree-vect-loop.cc (vect_analyze_loop): Stop querying
further epilogues after one with partial vectors.
(cherry picked from commit 57d30924e2b3887a1aedc6102daa67bc3272ace7)
Diff:
---
gcc/tree-vect-loop.cc | 1 +
1 file changed, 1 insertion(+)
diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index c824b5abaaff..a38bd5723fdd 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -3815,6 +3815,7 @@ vect_analyze_loop (class loop *loop, gimple
*loop_vectorized_call,
/* When we selected a first vectorized epilogue, see if the target
suggests to have another one. */
if (!unlimited_cost_model (loop)
+ && !LOOP_VINFO_USING_PARTIAL_VECTORS_P (orig_loop_vinfo)
&& (orig_loop_vinfo->vector_costs->suggested_epilogue_mode ()
!= VOIDmode))
{
