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| author | Roger Sayle <roger@eyesopen.com> | 2004-04-03 20:05:40 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2004-04-03 20:05:40 +0000 |
| commit | 2f63a4570c14bd64ab88295180c89482948c61e0 (patch) | |
| tree | 8e6a6e539c2c2e8944dd964fda8c850daf1c3d95 | |
| parent | ef1140a912b50510fdf4fd7fdb3b9d243087690b (diff) | |
| download | gcc-2f63a4570c14bd64ab88295180c89482948c61e0.zip gcc-2f63a4570c14bd64ab88295180c89482948c61e0.tar.gz gcc-2f63a4570c14bd64ab88295180c89482948c61e0.tar.bz2 | |
fold-const.c (fold): Guard (-A)+B -> B-A transformation with reorder_operands_p.
* fold-const.c (fold) <PLUS_EXPR>: Guard (-A)+B -> B-A transformation
with reorder_operands_p.
From-SVN: r80381
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/fold-const.c | 5 |
2 files changed, 8 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 16547210..2575996 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2004-04-03 Roger Sayle <roger@eyesopen.com> + + * fold-const.c (fold) <PLUS_EXPR>: Guard (-A)+B -> B-A transformation + with reorder_operands_p. + 2004-04-03 Jan Hubicka <jh@suse.cz> * md.texi (vec_set, vec_extract, vec_init): Document. diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 3fc6dd2..e0d2adc 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -5861,9 +5861,10 @@ fold (tree expr) if (TREE_CODE (arg1) == NEGATE_EXPR) return fold (build (MINUS_EXPR, type, arg0, TREE_OPERAND (arg1, 0))); /* (-A) + B -> B - A */ - if (TREE_CODE (arg0) == NEGATE_EXPR) + if (TREE_CODE (arg0) == NEGATE_EXPR + && reorder_operands_p (TREE_OPERAND (arg0, 0), arg1)) return fold (build (MINUS_EXPR, type, arg1, TREE_OPERAND (arg0, 0))); - else if (! FLOAT_TYPE_P (type)) + if (! FLOAT_TYPE_P (type)) { if (integer_zerop (arg1)) return non_lvalue (fold_convert (type, arg0)); |