re PR tree-optimization/91445 (After memset, logical && operator produces false…

re PR tree-optimization/91445 (After memset, logical && operator produces false result, optimization level >=O1)

2019-08-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91445
	* gcc.dg/torture/pr91445.c: New testcase.

From-SVN: r274533

gcc/testsuite/ChangeLog

 2019-08-15  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/91445
+	* gcc.dg/torture/pr91445.c: New testcase.
+
+2019-08-15  Richard Biener  <rguenther@suse.de>
+
 	* gcc.dg/pr80170.c: Adjust to use __SIZETYPE__.
 
 2019-08-15  Richard Sandiford  <richard.sandiford@arm.com>

gcc/testsuite/gcc.dg/torture/pr91445.c

+/* { dg-do run } */
+
+struct S { _Bool x; };
+
+void
+foo (struct S *s)
+{
+  __builtin_memset (s, 0x11, sizeof (struct S));
+  s->x = 1;
+}
+
+int
+main ()
+{
+  struct S s;
+  foo (&s);
+  char c;
+  __builtin_memcpy (&c, &s.x, 1);
+  if (c != 1)
+    __builtin_abort ();
+  return 0;
+}