Fix value uninitialization in vn_reference_insert_pieces [PR102400]

2021-09-23  Feng Xue  <fxue@os.amperecomputing.com>

gcc/
	PR tree-optimization/102400
	* tree-ssa-sccvn.c (vn_reference_insert_pieces): Initialize
	result_vdef to zero value.

diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c
index a50bd6e3978191eda5a9dd42876f01f8bfe7ecb8..07a52887b6b4bd91d5a5afe7c97dc9b717f5b59c 100644 (file)
--- a/gcc/tree-ssa-sccvn.c
+++ b/gcc/tree-ssa-sccvn.c
@@ -3797,6 +3797,7 @@ 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);