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Re: pa reload problem
- To: law at redhat dot com
- Subject: Re: pa reload problem
- From: "John David Anglin" <dave at hiauly1 dot hia dot nrc dot ca>
- Date: Thu, 28 Dec 2000 00:18:04 -0500 (EST)
- Cc: rth at redhat dot com, alan at linuxcare dot com dot au, rhirst at linuxcare dot com, parisc-linux at thepuffingroup dot com, gcc-bugs at gcc dot gnu dot org
> In message <200012141640.LAA03285@hiauly1.hia.nrc.ca>you write:
> > That's what I thought. It would appear to occur when the above two insns
> > get moved out of a loop. The count gets decremented when the old insns
> > are deleted but not incremented when the new insns are created. The puzzle
> > is why the count is zero rather than 1. Maybe what happens is the two
> > insns in the loop are deleted first, then the label is deleted? Notice
> > that insn 788 is moved to insn 1530. However, the insn becomes 1531 and
> > the reg changes to 337 from 208.
> In this case we typically will bump the number of uses before we delete
> the insns that way the label doesn't go away unexpectedly.
As far I can tell, move_movables doesn't do this when it moves an insn
out of a loop. It does this by deleting the old insn and creating a new
one. It calls add_label_notes if notes need to be added to the new insn.
I sent a patch to add_label_notes for review which I think fixes the
problem.
Dave
--
J. David Anglin dave.anglin@nrc.ca
National Research Council of Canada (613) 990-0752 (FAX: 952-6605)