[gcc r13-8684] tree-optimization/114749 - reset partial vector decision for no-SLP retry

[Richard Biener <rguenth@gcc.gnu.org>]

https://gcc.gnu.org/g:704b15e277a8792ac4cd6008ee08bec4b047a3e6

commit r13-8684-g704b15e277a8792ac4cd6008ee08bec4b047a3e6
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Apr 17 10:40:04 2024 +0200

    tree-optimization/114749 - reset partial vector decision for no-SLP retry
    
    The following makes sure to reset LOOP_VINFO_USING_PARTIAL_VECTORS_P
    to its default of false when re-trying without SLP as otherwise
    analysis may run into bogus asserts.
    
            PR tree-optimization/114749
            * tree-vect-loop.cc (vect_analyze_loop_2): Reset
            LOOP_VINFO_USING_PARTIAL_VECTORS_P when re-trying without SLP.
    
    (cherry picked from commit bf2b5231312e1cea45732cb8df6ffa2b2c9115b6)

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 73caeb283e3..8bb2e3ff1c8 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -2957,6 +2957,7 @@ again:
   LOOP_VINFO_VERSIONING_THRESHOLD (loop_vinfo) = 0;
   LOOP_VINFO_CAN_USE_PARTIAL_VECTORS_P (loop_vinfo)
     = saved_can_use_partial_vectors_p;
+  LOOP_VINFO_USING_PARTIAL_VECTORS_P (loop_vinfo) = false;
 
   goto start_over;
 }