diff options
| author | John F. Carr <jfc@mit.edu> | 1997-08-23 23:25:05 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1997-08-23 17:25:05 -0600 |
| commit | b6ffe60242bddf106e906be802b5f739c266fc31 (patch) | |
| tree | d1b4496c251a555ed6ae53276f02d7a5a0fac110 | |
| parent | 2ebfd23067727c451e9cfc42e7c2fffb5ed7f006 (diff) | |
| download | gcc-b6ffe60242bddf106e906be802b5f739c266fc31.zip gcc-b6ffe60242bddf106e906be802b5f739c266fc31.tar.gz gcc-b6ffe60242bddf106e906be802b5f739c266fc31.tar.bz2 | |
unroll.c (find_splittable_givs): Only share if two givs have the same add and multiply values.
* unroll.c (find_splittable_givs): Only share if two givs have the
same add and multiply values.
Fixes some testsuite failures on the x86.
From-SVN: r14908
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/unroll.c | 9 |
2 files changed, 13 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 4ec6a68..483e9db 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Sat Aug 23 18:19:40 1997 John F. Carr <jfc@mit.edu> + + * unroll.c (find_splittable_givs): Only share if two givs have the + same add and multiply values. + Sat Aug 23 14:36:27 1997 Jim Wilson <wilson@cygnus.com> * m68k/next.h (GO_IF_INDEXABLE_BASE): Fix typo in undef. diff --git a/gcc/unroll.c b/gcc/unroll.c index f1864d3..2fb1f9a 100644 --- a/gcc/unroll.c +++ b/gcc/unroll.c @@ -2849,7 +2849,14 @@ find_splittable_givs (bl, unroll_type, loop_start, loop_end, increment, else if (unroll_type != UNROLL_COMPLETELY && v->giv_type == DEST_ADDR && v->same && v->same->giv_type == DEST_ADDR - && v->same->unrolled) + && v->same->unrolled + /* combine_givs_p may return true for some cases + where the add and mult values are not equal. + To share a register here, the values must be + equal. */ + && rtx_equal_p (v->same->mult_val, v->mult_val) + && rtx_equal_p (v->same->add_val, v->add_val)) + { v->dest_reg = v->same->dest_reg; v->shared = 1; |