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| author | danglin <danglin@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-04-25 00:58:28 +0000 |
|---|---|---|
| committer | danglin <danglin@138bc75d-0d04-0410-961f-82ee72b054a4> | 2003-04-25 00:58:28 +0000 |
| commit | 48691de1b4f8be6c520d1ec16c65a4f2fcf5ddb0 (patch) | |
| tree | d187c59aebf3efeb9af07a85e938b7f451cd074a /gcc/gcse.c | |
| parent | 07e929030d44a0ca40fdd879853c733bf53ca32d (diff) | |
| download | gcc-48691de1b4f8be6c520d1ec16c65a4f2fcf5ddb0.tar.gz | |
PR opt/8705
* gcse.c (try_replace_reg): On a successful substitution of a constant
into a single set, try to simplify the source of the set.
* loop.c (scan_loop): Don't try to optimize a MODE_CC set with a
constant source.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@66060 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/gcse.c')
| -rw-r--r-- | gcc/gcse.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/gcse.c b/gcc/gcse.c index 528aaca9980..db2fb57ff21 100644 --- a/gcc/gcse.c +++ b/gcc/gcse.c @@ -3963,6 +3963,15 @@ try_replace_reg (from, to, insn) if (num_changes_pending () && apply_change_group ()) success = 1; + /* Try to simplify SET_SRC if we have substituted a constant. */ + if (success && set && CONSTANT_P (to)) + { + src = simplify_rtx (SET_SRC (set)); + + if (src) + validate_change (insn, &SET_SRC (set), src, 0); + } + if (!success && set && reg_mentioned_p (from, SET_SRC (set))) { /* If above failed and this is a single set, try to simplify the source of |