------- Comment #3 from bonzini at gnu dot org 2007-10-10 06:44 -------
forward_propagate_and_simplify only propagates into single-set insns. In
principle there's nothing to forbid working on other insns (it already does it
for forward_propagate_subreg), but it is made harder because df does not record
the toplevel SET.
If a brave soul modifies df-scan.c to store that, it will be very easy to fix
this bug. In struct df_ref, "type" only requires an 8-bit bitfield. This way,
even without increasing memory consumption, there is room for an 8-bit index
into the parallel, or -1 if the PATTERN is a SET itself.
--
bonzini at gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |zadeck at gcc dot gnu dot
| |org
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-10-10 06:44:42
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33713
