SOURCES: gcc-pr19055.patch (NEW) - minor bitop optimization.

[pluto]

Author: pluto                        Date: Tue Jul  5 14:40:21 2005 GMT
Module: SOURCES                       Tag: HEAD
---- Log message:
- minor bitop optimization.

---- Files affected:
SOURCES:
   gcc-pr19055.patch (NONE -> 1.1)  (NEW)

---- Diffs:

================================================================
Index: SOURCES/gcc-pr19055.patch
diff -u /dev/null SOURCES/gcc-pr19055.patch:1.1
--- /dev/null	Tue Jul  5 16:40:21 2005
+++ SOURCES/gcc-pr19055.patch	Tue Jul  5 16:40:16 2005
@@ -0,0 +1,57 @@
+--- gcc/gcc/fold-const.c	2 Jul 2005 16:24:25 -0000	1.600
++++ gcc/gcc/fold-const.c	5 Jul 2005 01:24:59 -0000
+@@ -8056,6 +8056,54 @@ fold_binary (enum tree_code code, tree t
+ 	  goto bit_ior;
+ 	}
+ 
++      /* (X | Y) ^ X -> Y & ~ X*/
++      if (TREE_CODE (arg0) == BIT_IOR_EXPR
++          && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0))
++        {
++	  tree t2 = TREE_OPERAND (arg0, 1);
++	  t1 = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (arg1),
++			    arg1);
++	  t1 = fold_build2 (BIT_AND_EXPR, type, fold_convert (type, t2),
++			    fold_convert (type, t1));
++	  return t1;
++	}
++
++      /* (Y | X) ^ X -> Y & ~ X*/
++      if (TREE_CODE (arg0) == BIT_IOR_EXPR
++          && operand_equal_p (TREE_OPERAND (arg0, 1), arg1, 0))
++        {
++	  tree t2 = TREE_OPERAND (arg0, 0);
++	  t1 = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (arg1),
++			    arg1);
++	  t1 = fold_build2 (BIT_AND_EXPR, type, fold_convert (type, t2),
++			    fold_convert (type, t1));
++	  return t1;
++	}
++
++      /* X ^ (X | Y) -> Y & ~ X*/
++      if (TREE_CODE (arg1) == BIT_IOR_EXPR
++          && operand_equal_p (TREE_OPERAND (arg1, 0), arg0, 0))
++        {
++	  tree t2 = TREE_OPERAND (arg1, 1);
++	  t1 = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (arg0),
++			    arg0);
++	  t1 = fold_build2 (BIT_AND_EXPR, type, fold_convert (type, t2),
++			    fold_convert (type, t1));
++	  return t1;
++	}
++
++      /* X ^ (Y | X) -> Y & ~ X*/
++      if (TREE_CODE (arg1) == BIT_IOR_EXPR
++          && operand_equal_p (TREE_OPERAND (arg1, 1), arg0, 0))
++        {
++	  tree t2 = TREE_OPERAND (arg1, 0);
++	  t1 = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (arg0),
++			    arg0);
++	  t1 = fold_build2 (BIT_AND_EXPR, type, fold_convert (type, t2),
++			    fold_convert (type, t1));
++	  return t1;
++	}
++	
+       /* Convert ~X ^ ~Y to X ^ Y.  */
+       if (TREE_CODE (arg0) == BIT_NOT_EXPR
+ 	  && TREE_CODE (arg1) == BIT_NOT_EXPR)
================================================================