[PATCH, PR94774] tree-optimization: Fix use of uninitialized variable

[Stefan Schulze Frielinghaus via Gcc-patches]

Array retval is not necessarily initialized by function is_call_safe and
may be used afterwards.  Thus, initialize it explicitly.

Ok for master?

gcc/ChangeLog:

2020-04-27  Stefan Schulze Frielinghaus  <stefa...@linux.ibm.com>

        PR tree-optimization/94774
        * gimple-ssa-sprintf.c (try_substitute_return_value): Initialize
        variable retval.
---
 gcc/gimple-ssa-sprintf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/gimple-ssa-sprintf.c b/gcc/gimple-ssa-sprintf.c
index 1879686ce0a..011c3e21e63 100644
--- a/gcc/gimple-ssa-sprintf.c
+++ b/gcc/gimple-ssa-sprintf.c
@@ -4120,7 +4120,7 @@ try_substitute_return_value (gimple_stmt_iterator *gsi,
   bool removed = false;
 
   /* The minimum and maximum return value.  */
-  unsigned HOST_WIDE_INT retval[2];
+  unsigned HOST_WIDE_INT retval[2] = {0};
   bool safe = is_call_safe (info, res, true, retval);
 
   if (safe
-- 
2.25.3