ipa-prop.c (compute_complex_pass_through): If we cannot compute a non-varying…

ipa-prop.c (compute_complex_pass_through): If we cannot compute a non-varying offset for IPA_JF_ANCESTOR punt.

2009-08-14  Richard Guenther  <rguenther@suse.de>

	* ipa-prop.c (compute_complex_pass_through): If we cannot
	compute a non-varying offset for IPA_JF_ANCESTOR punt.

	* gcc.c-torture/execute/20090814-1.c: New testcase.

From-SVN: r150757

gcc/ChangeLog

+2009-08-14  Richard Guenther  <rguenther@suse.de>
+
+	* ipa-prop.c (compute_complex_pass_through): If we cannot
+	compute a non-varying offset for IPA_JF_ANCESTOR punt.
+
 2009-08-14  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* c-lex.c (c_lex_with_flags): Increase size of local variable

gcc/ipa-prop.c

@@ -377,7 +377,10 @@ compute_complex_pass_through (struct ipa_node_params *info,
   type = TREE_TYPE (op1);
 
   op1 = get_ref_base_and_extent (op1, &offset, &size, &max_size);
-  if (TREE_CODE (op1) != INDIRECT_REF)
+  if (TREE_CODE (op1) != INDIRECT_REF
+      /* If this is a varying address, punt.  */
+      || max_size == -1
+      || max_size != size)
     return;
   op1 = TREE_OPERAND (op1, 0);
   if (TREE_CODE (op1) != SSA_NAME

gcc/testsuite/ChangeLog

+2009-08-14  Richard Guenther  <rguenther@suse.de>
+
+	* gcc.c-torture/execute/20090814-1.c: New testcase.
+
 2009-08-14  David Edelsohn  <edelsohn@gnu.org>
 
 	* gcc.dg/graphite/graphite_autopar: Move to libgomp testsuite.

gcc/testsuite/gcc.c-torture/execute/20090814-1.c

+int __attribute__((noinline))
+bar (int *a)
+{
+  return *a;
+}
+int i;
+int __attribute__((noinline))
+foo (int (*a)[2])
+{
+  return bar (&(*a)[i]);
+}
+
+extern void abort (void);
+int a[2];
+int main()
+{
+  a[0] = -1;
+  a[1] = 42;
+  i = 1;
+  if (foo (&a) != 42)
+    abort ();
+  return 0;
+}