------- Comment #1 from wilson at gcc dot gnu dot org 2010-04-04 01:34 -------
This is failing due to invalid rtl unsharing. The asm has two dests. We end
up with a parallel with two sets, and the ASM_OPERAND_INPUT_VEC in each SET_SRC
is supposed to be the same rtl pointer. This is checked by asm_noperands.
This is necessary for reg-alloc to handle the asm correctly.
The invalid unsharing happens in the file sel-sched-ir.c in the function
create_copy_of_insn_rtx. It has code
res = create_insn_rtx_from_pattern (copy_rtx (PATTERN (insn_rtx)),
NULL_RTX);
This won't work. You can't use copy_rtx to copy an insn. You must use
copy_insn. See the code and comments in emit-rtl.c.
This problem can be fixed by changing the copy_rtx to copy_insn, but I'm
concerned that there may be other places in sel-sched*.c that also need fixing.
I don't know the code well enough to be able to easily tell which copy_rtx
calls are broken.
The testcase works on mainline, but the bug appears to still be there. This
testcase just doesn't trigger it.
--
wilson at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wilson at gcc dot gnu dot
| |org
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2010-04-04 01:34:03
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43603
