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| author | James A. Morrison <phython@gcc.gnu.org> | 2005-04-20 04:32:41 +0000 |
|---|---|---|
| committer | James A. Morrison <phython@gcc.gnu.org> | 2005-04-20 04:32:41 +0000 |
| commit | f242e7690e6e838ec12e2d09fe1b5fc7929e20da (patch) | |
| tree | b4037461c39b448b596c703851cd4c6686eae2b5 /gcc/fold-const.c | |
| parent | 33ab6245545612b87af5868b4f6e6373cc733791 (diff) | |
| download | gcc-f242e7690e6e838ec12e2d09fe1b5fc7929e20da.zip gcc-f242e7690e6e838ec12e2d09fe1b5fc7929e20da.tar.gz gcc-f242e7690e6e838ec12e2d09fe1b5fc7929e20da.tar.bz2 | |
fold-const.c (fold_binary): Fold ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify.
2005-04-19 James A. Morrison <phython@gcc.gnu.org>
* fold-const.c (fold_binary): Fold ~(X ^ Y) to ~X ^ Y or X ^ ~Y if
~X or ~Y simplify.
From-SVN: r98435
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 2c90d0c..2ed556b 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -7015,6 +7015,20 @@ fold_unary (enum tree_code code, tree type, tree op0) || (TREE_CODE (arg0) == PLUS_EXPR && integer_all_onesp (TREE_OPERAND (arg0, 1))))) return fold_build1 (NEGATE_EXPR, type, TREE_OPERAND (arg0, 0)); + /* Convert ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify. */ + else if (TREE_CODE (arg0) == BIT_XOR_EXPR + && (tem = fold_unary (BIT_NOT_EXPR, type, + fold_convert (type, + TREE_OPERAND (arg0, 0))))) + return fold_build2 (BIT_XOR_EXPR, type, tem, + fold_convert (type, TREE_OPERAND (arg0, 1))); + else if (TREE_CODE (arg0) == BIT_XOR_EXPR + && (tem = fold_unary (BIT_NOT_EXPR, type, + fold_convert (type, + TREE_OPERAND (arg0, 1))))) + return fold_build2 (BIT_XOR_EXPR, type, + fold_convert (type, TREE_OPERAND (arg0, 0)), tem); + return NULL_TREE; case TRUTH_NOT_EXPR: |