From: Richard Biener <rguenther@suse.de>
Date: Thu, 10 Jul 2025 09:23:59 +0000 (+0200)
Subject: Adjust reduction with conversion SLP build
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2b99395c312883ccf114476347a7f5174fde436d;p=thirdparty%2Fgcc.git

Adjust reduction with conversion SLP build

The following adjusts how we set SLP_TREE_VECTYPE for the conversion
node we build when fixing up the reduction with conversion SLP instance.
This should probably see more TLC, but the following avoids relying
on STMT_VINFO_VECTYPE for this.

	* tree-vect-slp.cc (vect_build_slp_instance): Do not use
	SLP_TREE_VECTYPE to determine the conversion back to the
	reduction IV.
---

diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index 68ef1ddda77..5ef45fd60f5 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -4067,7 +4067,12 @@ vect_build_slp_instance (vec_info *vinfo,
 		  for (unsigned i = 0; i < group_size; ++i)
 		    scalar_stmts.quick_push (next_info);
 		  slp_tree conv = vect_create_new_slp_node (scalar_stmts, 1);
-		  SLP_TREE_VECTYPE (conv) = STMT_VINFO_VECTYPE (next_info);
+		  SLP_TREE_VECTYPE (conv)
+		    = get_vectype_for_scalar_type (vinfo,
+						   TREE_TYPE
+						     (gimple_assign_lhs
+						       (scalar_def)),
+						   group_size);
 		  SLP_TREE_CHILDREN (conv).quick_push (node);
 		  SLP_INSTANCE_TREE (new_instance) = conv;
 		  /* We also have to fake this conversion stmt as SLP reduction