[PATCH] Fix value uninitialization in vn_reference_insert_pieces [PR102400]

[Feng Xue OS via Gcc-patches]

Bootstrapped/regtested on x86_64-linux.

Thanks,
Feng
---
2021-09-23  Feng Xue  <f...@os.amperecomputing.com>

gcc/ChangeLog
        PR tree-optimization/102400
        * tree-ssa-sccvn.c (vn_reference_insert_pieces): Initialize
        result_vdef to zero value.
---
 gcc/tree-ssa-sccvn.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c
index a901f51a025..e8b1c39184d 100644
--- a/gcc/tree-ssa-sccvn.c
+++ b/gcc/tree-ssa-sccvn.c
@@ -3811,6 +3811,7 @@ vn_reference_insert_pieces (tree vuse, alias_set_type set,
   if (result && TREE_CODE (result) == SSA_NAME)
     result = SSA_VAL (result);
   vr1->result = result;
+  vr1->result_vdef = NULL_TREE;
 
   slot = valid_info->references->find_slot_with_hash (vr1, vr1->hashcode,
                                                      INSERT);
-- 
2.17.1