fold-const.c (fold_binary_loc): Move ~X | X folding ...

	* fold-const.c (fold_binary_loc): Move ~X | X folding ...
	* match.pd: ... here.

	* gcc.dg/fold-ior-2.c: New test.

From-SVN: r225164

5 files changed, 62 insertions, 18 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 836b69c..5f2e14e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2015-06-30  Marek Polacek  <polacek@redhat.com>
+
+	* fold-const.c (fold_binary_loc): Move ~X | X folding ...
+	* match.pd: ... here.
+
 2015-06-30  Richard Biener  <rguenther@suse.de>
 
 	* target-insns.def (canonicalize_funcptr_for_compare): Add.
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 5cdb6d1..f330d78 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -10922,24 +10922,6 @@ fold_binary_loc (location_t loc,
 
     case BIT_IOR_EXPR:
     bit_ior:
-      /* ~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);
-	}
-
       /* Canonicalize (X & C1) | C2.  */
       if (TREE_CODE (arg0) == BIT_AND_EXPR
 	  && TREE_CODE (arg1) == INTEGER_CST
diff --git a/gcc/match.pd b/gcc/match.pd
index 0cf3d21..5dcbc1a 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -283,6 +283,12 @@ along with GCC; see the file COPYING3.  If not see
   (bit_and @0 integer_zerop@1)
   @1)
 
+/* ~x | x -> -1 */
+(simplify
+ (bit_ior:c (convert? @0) (convert? (bit_not @0)))
+ (if (tree_nop_conversion_p (type, TREE_TYPE (@0)))
+  { build_all_ones_cst (type); }))
+
 /* x ^ x -> 0 */
 (simplify
   (bit_xor @0 @0)
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f249a7d..b006b4c 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2015-06-30  Marek Polacek  <polacek@redhat.com>
+
+	* gcc.dg/fold-ior-2.c: New test.
+
 2015-06-30  Tom de Vries  <tom@codesourcery.com>
 
 	PR tree-optimization/66652
diff --git a/gcc/testsuite/gcc.dg/fold-ior-2.c b/gcc/testsuite/gcc.dg/fold-ior-2.c
new file mode 100644
index 0000000..6abac9e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/fold-ior-2.c
@@ -0,0 +1,47 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-cddce1" } */
+
+int
+fn1 (int x)
+{
+  return ~x | x;
+}
+
+int
+fn2 (int x)
+{
+  return x | ~x;
+}
+
+unsigned int
+fn3 (unsigned int x)
+{
+  return ~x | x;
+}
+
+unsigned int
+fn4 (unsigned int x)
+{
+  return ~x | x;
+}
+
+int
+fn5 (int x)
+{
+  return ~x | (unsigned) x;
+}
+
+int
+fn6 (int x)
+{
+  return (unsigned) ~x | x;
+}
+
+int
+fn7 (int x)
+{
+  return ~(unsigned) x | x;
+}
+
+/* { dg-final { scan-tree-dump-not "~" "cddce1" } } */
+/* { dg-final { scan-tree-dump-not " \\| " "cddce1" } } */