re PR tree-optimization/37997 (PHI translation does not simplify to non-constants)

2012-01-19  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/37997
	* gcc.dg/tree-ssa/ssa-pre-28.c: New testcase.

From-SVN: r183297

gcc/testsuite/ChangeLog

+2012-01-19  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/37997
+	* gcc.dg/tree-ssa/ssa-pre-28.c: New testcase.
+
 2012-01-19 Andrey Belevantsev <abel@ispras.ru>
 
 	PR rtl-optimization/51505

gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-28.c

+/* PR37997 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-pre-details" } */
+
+int foo (int i, int b, int result)
+{
+  int mask;
+  if (b)
+    mask = -1;
+  else
+    mask = 0;
+  result = i + 1;
+  result = result & mask;
+  return result;
+}
+
+/* We should insert i + 1 into the if (b) path as well as the simplified
+   i + 1 & -1 expression.  And do replacement with two PHI temps.  */
+
+/* { dg-final { scan-tree-dump-times "with prephitmp" 2 "pre" } } */
+/* { dg-final { cleanup-tree-dump "pre" } } */