diff options
| author | Jim Wilson <wilson@gcc.gnu.org> | 1996-06-06 12:05:21 -0700 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1996-06-06 12:05:21 -0700 |
| commit | bb91b814bd698e504ccdcc5c426060ea659438fc (patch) | |
| tree | edcf3aaa2a0e050a6e77bbb46d211ef6aa790a98 /gcc/loop.c | |
| parent | 7d473b076dd3c41fa46f835564a0827c28f0422e (diff) | |
| download | gcc-bb91b814bd698e504ccdcc5c426060ea659438fc.zip gcc-bb91b814bd698e504ccdcc5c426060ea659438fc.tar.gz gcc-bb91b814bd698e504ccdcc5c426060ea659438fc.tar.bz2 | |
(strength_reduce): If HAVE_cc0 defined, disable auto_inc_opt
if it would put an insn between a cc0 setter/user pair.
From-SVN: r12176
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 9 |
1 files changed, 9 insertions, 0 deletions
@@ -3937,6 +3937,15 @@ strength_reduce (scan_start, end, loop_top, insn_count, else auto_inc_opt = 1; +#ifdef HAVE_cc0 + /* We can't put an insn immediately after one setting + cc0, or immediately before one using cc0. */ + if ((auto_inc_opt == 1 && sets_cc0_p (PATTERN (v->insn))) + || (auto_inc_opt == -1 + && sets_cc0_p (PATTERN (prev_nonnote_insn (v->insn))))) + auto_inc_opt = 0; +#endif + if (auto_inc_opt) v->auto_inc_opt = 1; } |