fold-const.c (fold_binary_loc): Move ~X ^ X -> -1 and (X & Y) ^ Y -> ~X & Y transforms to ...

2015-07-01  Richard Biener  <rguenther@suse.de>

	* fold-const.c (fold_binary_loc): Move ~X ^ X -> -1 and
	(X & Y) ^ Y -> ~X & Y transforms to ...
	* match.pd: ... here.

From-SVN: r225225

gcc/ChangeLog

+2015-07-01  Richard Biener  <rguenther@suse.de>
+
+	* fold-const.c (fold_binary_loc): Move ~X ^ X -> -1 and
+	(X & Y) ^ Y -> ~X & Y transforms to ...
+	* match.pd: ... here.
+
 2015-07-01  Richard Biener <rguenther@suse.de>
 
 	* genmatch.c (expr::gen_transform): Shortcut re-simplifying

gcc/fold-const.c

@@ -10979,24 +10979,6 @@ fold_binary_loc (location_t loc,
       goto bit_rotate;
 
     case BIT_XOR_EXPR:
-      /* ~X ^ X is -1.  */
-      if (TREE_CODE (arg0) == BIT_NOT_EXPR
-	  && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0))
-	{
-	  t1 = build_zero_cst (type);
-	  t1 = fold_unary_loc (loc, BIT_NOT_EXPR, type, t1);
-	  return omit_one_operand_loc (loc, type, t1, arg1);
-	}
-
-      /* X ^ ~X is -1.  */
-      if (TREE_CODE (arg1) == BIT_NOT_EXPR
-	  && operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0))
-	{
-	  t1 = build_zero_cst (type);
-	  t1 = fold_unary_loc (loc, BIT_NOT_EXPR, type, t1);
-	  return omit_one_operand_loc (loc, type, t1, arg0);
-	}
-
       /* Fold (X & 1) ^ 1 as (X & 1) == 0.  */
       if (TREE_CODE (arg0) == BIT_AND_EXPR
 	  && INTEGRAL_TYPE_P (type)
@@ -11005,45 +10987,6 @@ fold_binary_loc (location_t loc,
 	return fold_build2_loc (loc, EQ_EXPR, type, arg0,
 				build_zero_cst (TREE_TYPE (arg0)));
 
-      /* Fold (X & Y) ^ Y as ~X & Y.  */
-      if (TREE_CODE (arg0) == BIT_AND_EXPR
-	  && operand_equal_p (TREE_OPERAND (arg0, 1), arg1, 0))
-	{
-	  tem = fold_convert_loc (loc, type, TREE_OPERAND (arg0, 0));
-	  return fold_build2_loc (loc, BIT_AND_EXPR, type,
-			      fold_build1_loc (loc, BIT_NOT_EXPR, type, tem),
-			      fold_convert_loc (loc, type, arg1));
-	}
-      /* Fold (X & Y) ^ X as ~Y & X.  */
-      if (TREE_CODE (arg0) == BIT_AND_EXPR
-	  && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0)
-	  && reorder_operands_p (TREE_OPERAND (arg0, 1), arg1))
-	{
-	  tem = fold_convert_loc (loc, type, TREE_OPERAND (arg0, 1));
-	  return fold_build2_loc (loc, BIT_AND_EXPR, type,
-			      fold_build1_loc (loc, BIT_NOT_EXPR, type, tem),
-			      fold_convert_loc (loc, type, arg1));
-	}
-      /* Fold X ^ (X & Y) as X & ~Y.  */
-      if (TREE_CODE (arg1) == BIT_AND_EXPR
-	  && operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0))
-	{
-	  tem = fold_convert_loc (loc, type, TREE_OPERAND (arg1, 1));
-	  return fold_build2_loc (loc, BIT_AND_EXPR, type,
-			      fold_convert_loc (loc, type, arg0),
-			      fold_build1_loc (loc, BIT_NOT_EXPR, type, tem));
-	}
-      /* Fold X ^ (Y & X) as ~Y & X.  */
-      if (TREE_CODE (arg1) == BIT_AND_EXPR
-	  && operand_equal_p (arg0, TREE_OPERAND (arg1, 1), 0)
-	  && reorder_operands_p (arg0, TREE_OPERAND (arg1, 0)))
-	{
-	  tem = fold_convert_loc (loc, type, TREE_OPERAND (arg1, 0));
-	  return fold_build2_loc (loc, BIT_AND_EXPR, type,
-			      fold_build1_loc (loc, BIT_NOT_EXPR, type, tem),
-			      fold_convert_loc (loc, type, arg0));
-	}
-
       /* See if this can be simplified into a rotate first.  If that
 	 is unsuccessful continue in the association code.  */
       goto bit_rotate;

gcc/match.pd

@@ -298,6 +298,11 @@ along with GCC; see the file COPYING3.  If not see
   (bit_xor @0 integer_all_onesp@1)
   (bit_not @0))
 
+/* ~X ^ X is -1.  */
+(simplify
+ (bit_xor:c (bit_not @0) @0)
+ { build_all_ones_cst (type); })
+
 /* x & ~0 -> x  */
 (simplify
  (bit_and @0 integer_all_onesp)
@@ -428,6 +433,11 @@ along with GCC; see the file COPYING3.  If not see
  (bit_xor (convert? (bit_not @0)) INTEGER_CST@1)
  (bit_xor (convert @0) (bit_not @1)))
 
+/* Fold (X & Y) ^ Y as ~X & Y.  */
+(simplify
+ (bit_xor:c (bit_and:c @0 @1) @1)
+ (bit_and (bit_not @0) @1))
+
 
 (simplify
  (abs (abs@1 @0))