re PR tree-optimization/47061 (VRP doesn't propagate through x<<=1, but it does for x*=2)

2012-06-29  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/47061
	* gcc.dg/tree-ssa/vrp71.c: New testcase.

From-SVN: r189076

gcc/testsuite/ChangeLog

 2012-06-29  Richard Guenther  <rguenther@suse.de>
 
+	PR tree-optimization/47061
+	* gcc.dg/tree-ssa/vrp71.c: New testcase.
+
+2012-06-29  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/37541
 	* gcc.dg/tree-ssa/pr37508.c: Adjust and un-XFAIL.
 

gcc/testsuite/gcc.dg/tree-ssa/vrp71.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-vrp1" } */
+
+int foo(int *p)
+{
+  int x = -10;
+  if (p[0]) x++;
+  if (p[1]) x++;
+  if (p[2]) x++;
+  if (p[3]) x++;
+  x <<= 2;
+  return (x > 0);
+}
+
+int bar(char c)
+{
+  int i = c << 1;
+  return i > 1000;
+}
+
+/* { dg-final { scan-tree-dump-times "return 0;" 2 "vrp1" } } */
+/* { dg-final { cleanup-tree-dump "vrp1" } } */