diff options
| author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2002-03-29 22:36:56 +0000 |
|---|---|---|
| committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2002-03-29 22:36:56 +0000 |
| commit | 0e6137dd2effc72be8bb0419bfdbc92983cb9e47 (patch) | |
| tree | 0f6e17e6827fb1922e8bc963f507e8a266753a48 /gcc/loop.c | |
| parent | c702c48b02adc28c87b02d41cb5424021afc351f (diff) | |
| download | gcc-0e6137dd2effc72be8bb0419bfdbc92983cb9e47.tar.gz | |
* loop.c (combine_movables): Do allow combination of pseudos.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@51581 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/gcc/loop.c b/gcc/loop.c index 6617608cfd3..99281d0dba4 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -1446,10 +1446,13 @@ combine_movables (movables, regs) /* Regs that are set more than once are not allowed to match or be matched. I'm no longer sure why not. */ + /* Only pseudo registers are allowed to match or be matched, + since move_movables does not validate the change. */ /* Perhaps testing m->consec_sets would be more appropriate here? */ for (m = movables->head; m; m = m->next) if (m->match == 0 && regs->array[m->regno].n_times_set == 1 + && m->regno >= FIRST_PSEUDO_REGISTER && !m->partial) { struct movable *m1; @@ -1461,11 +1464,9 @@ combine_movables (movables, regs) /* We want later insns to match the first one. Don't make the first one match any later ones. So start this loop at m->next. */ for (m1 = m->next; m1; m1 = m1->next) - /* ??? HACK! move_movables does not verify that the replacement - is valid, which can have disasterous effects with hard regs - and match_dup. Turn combination off for now. */ - if (0 && m != m1 && m1->match == 0 + if (m != m1 && m1->match == 0 && regs->array[m1->regno].n_times_set == 1 + && m1->regno >= FIRST_PSEUDO_REGISTER /* A reg used outside the loop mustn't be eliminated. */ && !m1->global /* A reg used for zero-extending mustn't be eliminated. */ |