2006-01-11 Ian Lance Taylor <ian@airs.com>
* combine.c (struct undo): Remove is_int. Enumify types of undos.
Allow undoing set of machine mode.
(do_SUBST): Use enums instead of is_int.
(do_SUBST_MODE): New function.
(SUBST_MODE): New macro.
(try_combine): Use SUBST_MODE/PUT_MODE instead of generating a new
reg and trying to replace reg_regno_rtx with a new register.
(undo_all): Use new enums, handle undoing a PUT_MODE change.
(simplify_set): Use SUBST_MODE.
(distribute_notes): Remove code that tried to update reg notes
for regno_reg_rtx changes.
From-SVN: r109579
