re PR tree-optimization/46491 (ipa-pure-const.c miscompilation)

	PR tree-optimization/46491
	* gcc.target/i386/pr46491.c: New test.

From-SVN: r166777

gcc/testsuite/ChangeLog

 2010-11-15  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/46491
+	* gcc.target/i386/pr46491.c: New test.
+
 	PR tree-optimization/46461
 	* gcc.c-torture/compile/pr46461.c: New test.
 

gcc/testsuite/gcc.target/i386/pr46491.c

+/* PR tree-optimization/46491 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort (void);
+
+__attribute__((noinline)) int
+foo (int *p)
+{
+  int r;
+  asm ("movl $6, (%1)\n\txorl %0, %0" : "=r" (r) : "r" (p) : "memory");
+  return r;
+}
+
+int
+main (void)
+{
+  int p = 8;
+  if ((foo (&p) ? : p) != 6)
+    abort ();
+  return 0;
+}