------- Comment #2 from amonakov at gcc dot gnu dot org 2010-04-06 17:10
-------
Thanks for the analysis.
This is reproducible on trunk with -O2 -fsel-sched-pipelining
-fselective-scheduling2 (with -O3, pressure-aware loop invariant motion
slightly changes the code, and it's not possible to disable it (not even with
-fno-ira-loop-pressure, because it's enabled unconditionally in
ia64_override_options)).
The real problem is that we are attempting to clone an instruction with asm
operands as a bookkeeping copy -- that should never happen. Thus, I think
copy_rtx calls should stay. We'll have to fix the scheduler to never attempt
such code motion.
--
amonakov at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |abel at gcc dot gnu dot org,
| |amonakov at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43603
