------- Additional Comments From ciceron at gcc dot gnu dot org 2005-02-13
11:16 -------
The compiler crashes because the GCSE pass generates an invalid insn:
(insn 138 10 108 0 (nil) (set (reg:SI 61)
(reg/v:SI 55)) -1 (nil)
(nil))
and this is caused by handle_avail_exp() which uses gen_rtx_SET () to
make the copy. This is correct for QI and HI modes but fails with SI/DI modes
because the HC11 port needs a more complex move (with a PARALLEL and a scratch).
Jeff Law comment in gcse.c (arround lines 3472):
/* ??? If the change fails, we return 0, even though we created
an insn. I think this is ok. */
is wrong. The change indeed failed but the insn remains and it's not valid
so it crashes later on.
Using gen_move_insn() fixed the problem.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |ciceron at gcc dot gnu dot
|dot org |org
Status|UNCONFIRMED |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17551
