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| author | Jeff Law <law@gcc.gnu.org> | 2005-03-10 21:52:42 -0700 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2005-03-10 21:52:42 -0700 |
| commit | cbefb99c9944240c248e7aa8dcd9bfd2b7ecc864 (patch) | |
| tree | b68e8b88fbd204957fa2a685eaa6985b21264dfc /gcc/fold-const.c | |
| parent | c0cbd601303809da24e1ea49b711193cba4815be (diff) | |
| download | gcc-cbefb99c9944240c248e7aa8dcd9bfd2b7ecc864.zip gcc-cbefb99c9944240c248e7aa8dcd9bfd2b7ecc864.tar.gz gcc-cbefb99c9944240c248e7aa8dcd9bfd2b7ecc864.tar.bz2 | |
re PR tree-optimization/15784 (fold misses binary optimization)
PR tree-optimization/15784
* fold-const.c (fold): Fold ~A + 1 to -A. Fold -A - 1
and -1 - A to ~A.
* stmt.c (expand_case): Don't change index_type. Convert minval
to the proper type.
From-SVN: r96289
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 9d0a9f0..3fdfb92 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -7198,6 +7198,11 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1) if (TREE_CODE (arg0) == NEGATE_EXPR && reorder_operands_p (TREE_OPERAND (arg0, 0), arg1)) return fold (build2 (MINUS_EXPR, type, arg1, TREE_OPERAND (arg0, 0))); + /* Convert ~A + 1 to -A. */ + if (INTEGRAL_TYPE_P (type) + && TREE_CODE (arg0) == BIT_NOT_EXPR + && integer_onep (arg1)) + return fold (build1 (NEGATE_EXPR, type, TREE_OPERAND (arg0, 0))); if (TREE_CODE (type) == COMPLEX_TYPE) { @@ -7636,6 +7641,16 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1) && reorder_operands_p (arg0, arg1)) return fold (build2 (MINUS_EXPR, type, negate_expr (arg1), TREE_OPERAND (arg0, 0))); + /* Convert -A - 1 to ~A. */ + if (INTEGRAL_TYPE_P (type) + && TREE_CODE (arg0) == NEGATE_EXPR + && integer_onep (arg1)) + return fold (build1 (BIT_NOT_EXPR, type, TREE_OPERAND (arg0, 0))); + + /* Convert -1 - A to ~A. */ + if (INTEGRAL_TYPE_P (type) + && integer_all_onesp (arg0)) + return fold (build1 (BIT_NOT_EXPR, type, arg1)); if (TREE_CODE (type) == COMPLEX_TYPE) { |