+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.
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
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),