I have a gcc 4.6.1 port that has the same sort of problems. I tried selectively porting some patches from later 4.6 releases, but they didn't seem to actually address the issue. I haven't looked at the trunk to see if there are patches that are more apropos.
On Oct 10, 2013, at 12:33 PM, Jeff Law <l...@redhat.com> wrote: > On 10/10/13 07:31, BELBACHIR Selim wrote: >> >> Why GCC doesn't see, in this case, that it's not safe to fill the delay slot >> with my compare insn (which is a parallel RTX which clobber one register >> used in fallthrough branch) ? >> Is a processor 'annuled jump strategy' mandatory to handle delay slot of >> conditionnal jump instructions ? > You'd need to debug reorg. reorg has code to track resources to avoid these > kind of issues. You'd have to debug why it's not working as expected. > > annulling is not required for proper functioning of the reorg pass, it's > merely an optimization. > > I'd start by first verifying your delay slot descriptions do not allow > nullifying the delay slot. > > Jeff
