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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 | |
| 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
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/fold-const.c | 7 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/pr24990-1.c | 21 |
4 files changed, 39 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2d5eed2..aeb45fd 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +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 !=. + 2005-11-25 Joseph S. Myers <joseph@codesourcery.com> PR middle-end/24998 diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 2d750f6c..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) diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index d2bc993..cb611dc 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2005-11-24 Andrew Pinski <pinskia@physics.uc.edu> + + PR middle-end/24990 + * tree-ssa/pr24990-1.c: New test. + 2005-11-24 Richard Guenther <rguenther@suse.de> Dirk Mueller <dmueller@suse.de> diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr24990-1.c b/gcc/testsuite/gcc.dg/tree-ssa/pr24990-1.c new file mode 100644 index 0000000..a518df0 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr24990-1.c @@ -0,0 +1,21 @@ +/* { dg-do compile } */ +/* { dg-options "-O1 -fdump-tree-optimized" } */ + +int f(int x) +{ + return ((~x) != 0); +} +int f1(int x) +{ + return ((~x) == 0); +} + +/* There should be no != 0 which is produced by the front-end as + ~x != 0 is the same as x != -1 (or ~0). Likewise for ==. */ +/* { dg-final { scan-tree-dump-times "!= 0" 0 "optimized"} } */ +/* { dg-final { scan-tree-dump-times "!= -1" 1 "optimized"} } */ +/* { dg-final { scan-tree-dump-times "== 0" 0 "optimized"} } */ +/* { dg-final { scan-tree-dump-times "== -1" 1 "optimized"} } */ + +/* { dg-final { cleanup-tree-dump "optimized" } } */ + |