fold-const.c (fold_unary_loc): Don't optimize POINTER_PLUS_EXPR casted to…

fold-const.c (fold_unary_loc): Don't optimize POINTER_PLUS_EXPR casted to TYPE_RESTRICT pointer by casting the...

	* fold-const.c (fold_unary_loc): Don't optimize
	POINTER_PLUS_EXPR casted to TYPE_RESTRICT pointer by
	casting the inner pointer if it isn't TYPE_RESTRICT.
	* tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Don't through
	casts from non-TYPE_RESTRICT pointer to TYPE_RESTRICT pointer.

	* gcc.dg/tree-ssa/restrict-4.c: New test.

From-SVN: r179500

gcc/ChangeLog

+2011-10-04  Jakub Jelinek  <jakub@redhat.com>
+
+	* fold-const.c (fold_unary_loc): Don't optimize
+	POINTER_PLUS_EXPR casted to TYPE_RESTRICT pointer by
+	casting the inner pointer if it isn't TYPE_RESTRICT.
+	* tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Don't through
+	casts from non-TYPE_RESTRICT pointer to TYPE_RESTRICT pointer.
+
 2011-10-04  Joseph Myers  <joseph@codesourcery.com>
 
 	* config.gcc (i[34567]86-*-elf*, x86_64-*-elf*): Use

gcc/fold-const.c

@@ -7946,6 +7946,7 @@ fold_unary_loc (location_t loc, enum tree_code code, tree type, tree op0)
 	 that this happens when X or Y is NOP_EXPR or Y is INTEGER_CST. */
       if (POINTER_TYPE_P (type)
 	  && TREE_CODE (arg0) == POINTER_PLUS_EXPR
+	  && (!TYPE_RESTRICT (type) || TYPE_RESTRICT (TREE_TYPE (arg0)))
 	  && (TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST
 	      || TREE_CODE (TREE_OPERAND (arg0, 0)) == NOP_EXPR
 	      || TREE_CODE (TREE_OPERAND (arg0, 1)) == NOP_EXPR))

gcc/testsuite/ChangeLog

+2011-10-04  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc.dg/tree-ssa/restrict-4.c: New test.
+
 2011-10-04  Artem Shinkarov  <artyom.shinkaroff@gmail.com>
 
 	* gcc.c-torture/execute/vector-compare-1.c: Fix trailing white

gcc/testsuite/gcc.dg/tree-ssa/restrict-4.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+int
+foo (int *x, int y)
+{
+  int *__restrict p1 = x;
+  int *__restrict p2 = x + 32;
+  p1[y] = 1;
+  p2[4] = 2;
+  return p1[y];
+}
+
+int
+bar (int *x, int y)
+{
+  int *__restrict p1 = x;
+  int *p3 = x + 32;
+  int *__restrict p2 = p3;
+  p1[y] = 1;
+  p2[4] = 2;
+  return p1[y];
+}
+
+/* { dg-final { scan-tree-dump-times "return 1;" 2 "optimized" } } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */

gcc/tree-ssa-forwprop.c

@@ -804,6 +804,11 @@ forward_propagate_addr_expr_1 (tree name, tree def_rhs,
       && ((rhs_code == SSA_NAME && rhs == name)
 	  || CONVERT_EXPR_CODE_P (rhs_code)))
     {
+      /* Don't propagate restrict pointer's RHS.  */
+      if (TYPE_RESTRICT (TREE_TYPE (lhs))
+	  && !TYPE_RESTRICT (TREE_TYPE (name))
+	  && !is_gimple_min_invariant (def_rhs))
+	return false;
       /* Only recurse if we don't deal with a single use or we cannot
 	 do the propagation to the current statement.  In particular
 	 we can end up with a conversion needed for a non-invariant