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fold-const.c (fold): Fold (A & ~B) - (A & B) into (A ^ B) - B for any B.

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* fold-const.c (fold): Fold (A & ~B) - (A & B) into
	(A ^ B) - B for any B.

From-SVN: r71953
This commit is contained in:
Kazu Hirata 2003-09-30 21:07:41 +00:00 committed by Kazu Hirata
parent ae7c3ba55f
commit 518723777f
2 changed files with 7 additions and 6 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-09-30 Kazu Hirata <kazu@cs.umass.edu>
* fold-const.c (fold): Fold (A & ~B) - (A & B) into
(A ^ B) - B for any B.
2003-09-30 Nathanael Nerode <neroden@gcc.gnu.org>
* config.gcc (arm*-*-kaos*, i[34567]86-*-kaos*, powerpc-*-kaos*,

8
gcc/fold-const.c
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@ -6023,17 +6023,13 @@ fold (tree expr)
if (TREE_CODE (arg0) == BIT_AND_EXPR
&& TREE_CODE (arg1) == BIT_AND_EXPR
&& operand_equal_p (TREE_OPERAND (arg0, 0),
TREE_OPERAND (arg1, 0), 0)
&& TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST
&& TREE_CODE (TREE_OPERAND (arg1, 1)) == INTEGER_CST)
TREE_OPERAND (arg1, 0), 0))
{
tree mask0 = TREE_OPERAND (arg0, 1);
tree mask1 = TREE_OPERAND (arg1, 1);
tree tem = fold (build1 (BIT_NOT_EXPR, type, mask0));
if (operand_equal_p (tem, mask1, 0)
&& integer_pow2p (fold (build (PLUS_EXPR, type,
mask1, integer_one_node))))
if (operand_equal_p (tem, mask1, 0))
{
tem = fold (build (BIT_XOR_EXPR, type,
TREE_OPERAND (arg0, 0), mask1));