[gcc(refs/vendors/ARM/heads/arm-perf-staging)] tree-optimization: Fix use of uninitialized variable [PR94774]

[Tamar Christina]

https://gcc.gnu.org/g:1657178f59bf0c5b269a668bcdcc432fac3bbdd0

commit 1657178f59bf0c5b269a668bcdcc432fac3bbdd0
Author: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
Date:   Mon Apr 27 18:09:07 2020 +0200

    tree-optimization: Fix use of uninitialized variable [PR94774]
    
    Array retval is not necessarily initialized by function is_call_safe and
    may be used afterwards.  Thus, initialize it explicitly.
    
    gcc/ChangeLog:
    
    2020-04-29  Stefan Schulze Frielinghaus  <stefansf@linux.ibm.com>
    
            PR tree-optimization/94774
            * gimple-ssa-sprintf.c (try_substitute_return_value): Initialize
            variable retval.

Diff:
---
 gcc/ChangeLog            | 6 ++++++
 gcc/gimple-ssa-sprintf.c | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a1100623dc9..f33193b0ec0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2020-04-29  Stefan Schulze Frielinghaus  <stefansf@linux.ibm.com>
+
+	PR tree-optimization/94774
+	* gimple-ssa-sprintf.c (try_substitute_return_value): Initialize
+	variable retval.
+
 2020-04-29  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* calls.h (cxx17_empty_base_field_p): Turn into a function declaration.
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