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| author | Toon Moene <toon@moene.indiv.nluug.nl> | 1997-10-26 18:05:24 +0100 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1997-10-26 10:05:24 -0700 |
| commit | 91585c63e4f946b21ec89f51bb8ec555444ddd1f (patch) | |
| tree | 417017ecb7a6d73819a07a63f313f7219f676602 /gcc | |
| parent | 6d6d0fa07e124c351a01f4cadcfc16ef215817ad (diff) | |
| download | gcc-91585c63e4f946b21ec89f51bb8ec555444ddd1f.zip gcc-91585c63e4f946b21ec89f51bb8ec555444ddd1f.tar.gz gcc-91585c63e4f946b21ec89f51bb8ec555444ddd1f.tar.bz2 | |
fold-const (fold): Also simplify FLOOR_DIV_EXPR to EXACT_DIV_EXPR if...
* fold-const (fold): Also simplify FLOOR_DIV_EXPR to EXACT_DIV_EXPR
if the dividend is a multiple of the divisor.
From-SVN: r16181
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/fold-const.c | 9 |
2 files changed, 9 insertions, 5 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 9ad14ce..9b397f9 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Sun Oct 26 10:06:11 1997 Toon Moene <toon@moene.indiv.nluug.nl> + + * fold-const (fold): Also simplify FLOOR_DIV_EXPR to EXACT_DIV_EXPR + if the dividend is a multiple of the divisor. + Sun Oct 26 09:21:40 1997 Jeffrey A Law (law@cygnus.com) * toplev.c (flag_rerun_loop_opt): New variable. diff --git a/gcc/fold-const.c b/gcc/fold-const.c index def96bf..1e823fb 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -4610,11 +4610,10 @@ fold (expr) /* If arg0 is a multiple of arg1, then rewrite to the fastest div operation, EXACT_DIV_EXPR. - Note that only CEIL_DIV_EXPR is rewritten now, only because the - others seem to be faster in some cases. This is probably just - due to more work being done to optimize others in expmed.c than on - EXACT_DIV_EXPR. */ - if (code == CEIL_DIV_EXPR + Note that only CEIL_DIV_EXPR and FLOOR_DIV_EXPR are rewritten now. + At one time others generated faster code, it's not clear if they do + after the last round to changes to the DIV code in expmed.c. */ + if ((code == CEIL_DIV_EXPR || code == FLOOR_DIV_EXPR) && multiple_of_p (type, arg0, arg1)) return fold (build (EXACT_DIV_EXPR, type, arg0, arg1)); |