From: Kewen Lin <linkw@linux.ibm.com>
Date: Mon, 17 Jul 2023 08:44:59 +0000 (-0500)
Subject: vect: Initialize new_temp to avoid false positive warning [PR110652]
X-Git-Tag: basepoints/gcc-15~7579
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=081c623ca88dc53abe34b5f5661e79fcde800cef;p=thirdparty%2Fgcc.git

vect: Initialize new_temp to avoid false positive warning [PR110652]

As PR110652 and its duplicate PRs show, there could be one
build error

  error: 'new_temp' may be used uninitialized

for some build configurations.  It's a false positive warning
(or error at -Werror), but in order to make the build succeed,
this patch is to initialize the reported variable 'new_temp'
as NULL_TREE.

	PR tree-optimization/110652

gcc/ChangeLog:

	* tree-vect-stmts.cc (vectorizable_load): Initialize new_temp as
	NULL_TREE.
---

diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index c08d0ef951fc..cb86d544313f 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -9297,7 +9297,8 @@ vectorizable_load (vec_info *vinfo,
   class loop *containing_loop = gimple_bb (stmt_info->stmt)->loop_father;
   bool nested_in_vect_loop = false;
   tree elem_type;
-  tree new_temp;
+  /* Avoid false positive uninitialized warning, see PR110652.  */
+  tree new_temp = NULL_TREE;
   machine_mode mode;
   tree dummy;
   tree dataref_ptr = NULL_TREE;