The forwarded_bytes sbitmap needs to be zeroed after allocation,
as sbitmaps are not implicitly initialized. This caused valgrind
warnings about conditional jumps depending on uninitialised values.
gcc/ChangeLog:
PR rtl-optimization/124351
* avoid-store-forwarding.cc (process_store_forwarding): Add
bitmap_clear after allocating forwarded_bytes.
---
gcc/avoid-store-forwarding.cc | 2 ++
1 file changed, 2 insertions(+)
diff --git a/gcc/avoid-store-forwarding.cc b/gcc/avoid-store-forwarding.cc
index f9c43a2ec460..75ba30a62eb5 100644
--- a/gcc/avoid-store-forwarding.cc
+++ b/gcc/avoid-store-forwarding.cc
@@ -177,6 +177,8 @@ process_store_forwarding (vec<store_fwd_info> &stores,
rtx_insn *load_insn,
by later stores. */
auto_sbitmap forwarded_bytes (load_size);
+ bitmap_clear (forwarded_bytes);
+
unsigned int i;
store_fwd_info* it;
auto_vec<store_fwd_info> redundant_stores;
--
2.34.1
