From: Richard Biener <rguenther@suse.de>
Date: Mon, 12 Jan 2026 13:10:32 +0000 (+0100)
Subject: tree-optimization/123539 - signed UB in vector reduction
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=47d09318c411911408058de38bebc16a177fa8e1;p=thirdparty%2Fgcc.git

tree-optimization/123539 - signed UB in vector reduction

With previous changes I overlooked one use of vectype.

	PR tree-optimization/123539
	* tree-vect-loop.cc (vect_create_epilog_for_reduction):
	Use the compute vectype to pun down to smaller or element
	size for by-element reductions.
---

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 03339641750..74eecb832e6 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -6000,7 +6000,7 @@ vect_create_epilog_for_reduction (loop_vec_info loop_vinfo,
 	       && (mode1 = targetm.vectorize.split_reduction (mode)) != mode)
 	nunits1 = GET_MODE_NUNITS (mode1).to_constant ();
 
-      tree vectype1 = vectype;
+      tree vectype1 = compute_vectype;
       if (mode1 != mode)
 	{
 	  vectype1 = get_related_vectype_for_scalar_type (TYPE_MODE (vectype),