https://gcc.gnu.org/g:57d30924e2b3887a1aedc6102daa67bc3272ace7
commit r16-1910-g57d30924e2b3887a1aedc6102daa67bc3272ace7
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.
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 575987e4bf01..2782d61a5fc2 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -3792,6 +3792,7 @@ 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))
{
