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| author | Roger Sayle <roger@eyesopen.com> | 2004-02-07 15:35:40 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2004-02-07 15:35:40 +0000 |
| commit | dfb36f9be274a9968048ab7137eb52a258aa7106 (patch) | |
| tree | 04db5646c3835e0841ea50cc2a2ab2d6036b7d68 /gcc/system.h | |
| parent | 0ea5865c17469625fcd91d2dcecf5dec6fe4ce10 (diff) | |
| download | gcc-dfb36f9be274a9968048ab7137eb52a258aa7106.zip gcc-dfb36f9be274a9968048ab7137eb52a258aa7106.tar.gz gcc-dfb36f9be274a9968048ab7137eb52a258aa7106.tar.bz2 | |
fold-const.c (negate_expr_p, [...]): Optimize -(A+B) into either (-A)-B or (-B)-A...
* fold-const.c (negate_expr_p, negate_expr): Optimize -(A+B) into
either (-A)-B or (-B)-A, if A or B is easily negated respectively.
(fold) <MINUS_EXPR>: Optimize (A*C) - (B*C) -> (A-B)*C for both
integer types and floating point with unsafe_math_optimizations.
Add similar optimization for (A*C1) - (A*C2) -> A*(C1-C2).
Optimize A - B as A + (-B), if B is easily negated.
From-SVN: r77453
Diffstat (limited to 'gcc/system.h')
0 files changed, 0 insertions, 0 deletions