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

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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.
This commit is contained in:
Stefan Schulze Frielinghaus 2020-04-27 18:09:07 +02:00
parent a7201a085c
commit 1657178f59
2 changed files with 7 additions and 1 deletions
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gcc/ChangeLog
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@ -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.

2
gcc/gimple-ssa-sprintf.c
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@ -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