Testcase for PR rtl-optimization/68381

	PR rtl-optimization/68381
	* gcc.c-torture/execute/pr68381.c: New test.

From-SVN: r230809

gcc/testsuite/ChangeLog

 2015-11-24  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
+	PR rtl-optimization/68381
+	* gcc.c-torture/execute/pr68381.c: New test.
+
+2015-11-24  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
 	* gcc.target/aarch64/cmpimm_branch_1.c: New test.
 	* gcc.target/aarch64/cmpimm_cset_1.c: Likewise.
 

gcc/testsuite/gcc.c-torture/execute/pr68381.c

+/* { dg-options "-O -fexpensive-optimizations -fno-tree-bit-ccp" } */
+
+__attribute__ ((noinline, noclone))
+int
+foo (unsigned short x, unsigned short y)
+{
+  int r;
+  if (__builtin_mul_overflow (x, y, &r))
+    __builtin_abort ();
+  return r;
+}
+
+int
+main (void)
+{
+  int x = 1;
+  int y = 2;
+  if (foo (x, y) != x * y)
+    __builtin_abort ();
+  return 0;
+}
+