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| author | Andrew Pinski <pinskia@physics.uc.edu> | 2005-11-25 04:54:59 +0000 |
|---|---|---|
| committer | Andrew Pinski <pinskia@gcc.gnu.org> | 2005-11-24 20:54:59 -0800 |
| commit | 210dfe6eccfaba41bf3860963b023a30c276dcbc (patch) | |
| tree | ce051b7b6a061d6d5ab22d134d04e47bb4ba286b /gcc/fold-const.c | |
| parent | 4ca6f88ae88df2e1a41c728d2ced1763b026c854 (diff) | |
| download | gcc-210dfe6eccfaba41bf3860963b023a30c276dcbc.zip gcc-210dfe6eccfaba41bf3860963b023a30c276dcbc.tar.gz gcc-210dfe6eccfaba41bf3860963b023a30c276dcbc.tar.bz2 | |
[multiple changes]
2005-11-25 Andrew Pinski <pinskia@physics.uc.edu>
PR middle-end/24990
* fold-const.c (fold_binary): Fold (~a) == C to a == ~C
for C being INTEGER_CST. Likewise for !=.
2005-11-24 Andrew Pinski <pinskia@physics.uc.edu>
PR middle-end/24990
* tree-ssa/pr24990-1.c: New test.
From-SVN: r107487
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 2d750f6..962ebd3 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -8839,6 +8839,13 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1) /* If one arg is a real or integer constant, put it last. */ if (tree_swap_operands_p (arg0, arg1, true)) return fold_build2 (swap_tree_comparison (code), type, op1, op0); + + /* ~a != C becomes a != ~C where C is a constant. Likewise for ==. */ + if (TREE_CODE (arg0) == BIT_NOT_EXPR && TREE_CODE (arg1) == INTEGER_CST + && (code == NE_EXPR || code == EQ_EXPR)) + return fold_build2 (code, type, TREE_OPERAND (arg0, 0), + fold_build1 (BIT_NOT_EXPR, TREE_TYPE (arg1), + arg1)); /* bool_var != 0 becomes bool_var. */ if (TREE_CODE (TREE_TYPE (arg0)) == BOOLEAN_TYPE && integer_zerop (arg1) |