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

[Kewen.Lin via Gcc-patches]

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