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| author | John David Anglin <dave.anglin@nrc-cnrc.gc.ca> | 2003-04-25 00:58:28 +0000 |
|---|---|---|
| committer | John David Anglin <danglin@gcc.gnu.org> | 2003-04-25 00:58:28 +0000 |
| commit | 9feff11466f71874cad0446eb5b08eec82a3bdc0 (patch) | |
| tree | d187c59aebf3efeb9af07a85e938b7f451cd074a /gcc | |
| parent | 13e7174292985ffa15d192d59da140b70e0d8a5f (diff) | |
| download | gcc-9feff11466f71874cad0446eb5b08eec82a3bdc0.zip gcc-9feff11466f71874cad0446eb5b08eec82a3bdc0.tar.gz gcc-9feff11466f71874cad0446eb5b08eec82a3bdc0.tar.bz2 | |
re PR rtl-optimization/8705 ([HP-PA] ICE in emit_move_insn_1, at expr.c:3101)
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.
From-SVN: r66060
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 8 | ||||
| -rw-r--r-- | gcc/gcse.c | 9 | ||||
| -rw-r--r-- | gcc/loop.c | 8 |
3 files changed, 24 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 89ba2f8..51371d3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,11 @@ +2003-04-24 John David Anglin <dave.anglin@nrc-cnrc.gc.ca> + + 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. + 2003-04-24 Neil Booth <neil@daikokuya.co.uk> * cpplex.c (cpp_token_len): Tighten up. @@ -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 @@ -833,11 +833,17 @@ scan_loop (loop, flags) That behavior is incorrect and was removed. */ insert_temp = 1; + /* Don't try to optimize a MODE_CC set with a constant + source. It probably will be combined with a conditional + jump. */ + if (GET_MODE_CLASS (GET_MODE (SET_DEST (set))) == MODE_CC + && CONSTANT_P (src)) + ; /* Don't try to optimize a register that was made by loop-optimization for an inner loop. We don't know its life-span, so we can't compute the benefit. */ - if (REGNO (SET_DEST (set)) >= max_reg_before_loop) + else if (REGNO (SET_DEST (set)) >= max_reg_before_loop) ; /* Don't move the source and add a reg-to-reg copy: - with -Os (this certainly increases size), |