diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 51b5b6c908df..0a1ff053ffa5 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2020-05-18  Stefan Schulze Frielinghaus  <stefansf@linux.ibm.com>
+
+	PR tree-optimization/94952
+	* gimple-ssa-store-merging.c (pass_store_merging::process_store):
+	Initialize variables bitpos, bitregion_start, and bitregion_end in
+	order to silence warnings about use of uninitialized variables.
+
 2020-05-18  Carl Love  <cel@us.ibm.com>
 
 	PR target/94833
diff --git a/gcc/gimple-ssa-store-merging.c b/gcc/gimple-ssa-store-merging.c
index 25753517cc67..c8e1877f5407 100644
--- a/gcc/gimple-ssa-store-merging.c
+++ b/gcc/gimple-ssa-store-merging.c
@@ -4668,8 +4668,8 @@ pass_store_merging::process_store (gimple *stmt)
 {
   tree lhs = gimple_assign_lhs (stmt);
   tree rhs = gimple_assign_rhs1 (stmt);
-  poly_uint64 bitsize, bitpos;
-  poly_uint64 bitregion_start, bitregion_end;
+  poly_uint64 bitsize, bitpos = 0;
+  poly_uint64 bitregion_start = 0, bitregion_end = 0;
   tree base_addr
     = mem_valid_for_store_merging (lhs, &bitsize, &bitpos,
 				   &bitregion_start, &bitregion_end);