From: "Kewen.Lin" <linkw@linux.ibm.com>
To: GCC Patches <gcc-patches@gcc.gnu.org>
Cc: Richard Biener <richard.guenther@gmail.com>
Subject: [PATCH] vect: Initialize new_temp to avoid false positive warning [PR110652]
Date: Mon, 17 Jul 2023 10:22:32 +0800 [thread overview]
Message-ID: <8baf564b-e742-0b95-c052-53b1082db372@linux.ibm.com> (raw)
Hi,
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.
Confirmed this patch fixed the reported issue in PR110652
(with the same configuration).
Is it ok for trunk?
BR,
Kewen
-----
PR tree-optimization/110652
gcc/ChangeLog:
* tree-vect-stmts.cc (vectorizable_load): Initialize new_temp as
NULL_TREE.
---
gcc/tree-vect-stmts.cc | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index c08d0ef951f..cb86d544313 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;
--
2.31.1
next reply other threads:[~2023-07-17 2:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-17 2:22 Kewen.Lin [this message]
2023-07-17 6:39 ` Richard Biener
2023-07-17 8:48 ` Kewen.Lin
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