re PR tree-optimization/36008 (Function produces wrong results when inlined.)

	PR tree-optimization/36008
	* fold-const.c (try_move_mult_to_index): If s == NULL, divide
	the original op1, rather than delta by step.

	* gcc.c-torture/execute/20080424-1.c: New test.

From-SVN: r134634

gcc/ChangeLog

+2008-04-24  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/36008
+	* fold-const.c (try_move_mult_to_index): If s == NULL, divide
+	the original op1, rather than delta by step.
+
 2008-04-22  Antoniu Pop  <antoniu.pop@gmail.com>
             Sebastian Pop  <sebastian.pop@amd.com>
 

gcc/fold-const.c

@@ -6919,7 +6919,7 @@ try_move_mult_to_index (tree addr, tree op1)
 	  else
 	    {
 	      /* Try if delta is a multiple of step.  */
-	      tree tmp = div_if_zero_remainder (EXACT_DIV_EXPR, delta, step);
+	      tree tmp = div_if_zero_remainder (EXACT_DIV_EXPR, op1, step);
 	      if (! tmp)
 		continue;
 	      delta = tmp;

gcc/testsuite/ChangeLog

+2008-04-24  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/36008
+	* gcc.c-torture/execute/20080424-1.c: New test.
+
 2008-04-24  Ira Rosen  <irar@il.ibm.com>
 	Richard Guenther  <rguenther@suse.de>
 

gcc/testsuite/gcc.c-torture/execute/20080424-1.c

+/* PR tree-optimization/36008 */
+
+extern void abort (void);
+
+int g[48][3][3];
+
+void __attribute__ ((noinline))
+bar (int x[3][3], int y[3][3])
+{
+  static int i;
+  if (x != g[i + 8] || y != g[i++])
+    abort ();
+}
+
+static inline void __attribute__ ((always_inline))
+foo (int x[][3][3])
+{
+  int i;
+  for (i = 0; i < 8; i++)
+    {
+      int k = i + 8;
+      bar (x[k], x[k - 8]);
+    }
+}
+
+int
+main ()
+{
+  foo (g);
+  return 0;
+}