[prev in list] [next in list] [prev in thread] [next in thread] 

List:       gcc-bugs
Subject:    Re: PATCH 1: Re: BOOTSTRAP FAILURE: segementation fault in genattrtab
From:       "John David Anglin" <dave () hiauly1 ! hia ! nrc ! ca>
Date:       2000-11-30 18:45:28
[Download RAW message or body]

>   In message <200011210645.BAA15807@hiauly1.hia.nrc.ca>you write:
>   > Is there a simple test to determine whether the frame pointer or other
>   > eliminable register has been eliminated?
> I believe you can check FRAME_POINTER_NEEDED.
> 
>   >  When I wrote the patch, I assumed
>   > that no code would call gen_rtx_REG if it needed the frame_pointer_rtx
>   > after reload even if it hadn't been eliminated.  If there was such code,
>   > the hack in the pa.md probably would have broken long ago.  Isn't the above
>   > unnecessarily complicating things?'
> Possibly not.  But better safe than sorry IMHO.
> 
>   > This gets even messier for the arg_pointer_rtx.  On the pa 64 bit target,
>   > the arg pointer isn't eliminable or always invariant, so the register could
>   >  be used for multiple purposes in a function.
> Yes.  But if you look at how the arg pointer is handled in that case you'll
> find that it gets copied into a special pseudo.

I believe that the above issues are addressed in this revised patch which
I sent the other day: <http://gcc.gnu.org/ml/gcc-bugs/2000-11/msg00797.html>.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

[prev in list] [next in list] [prev in thread] [next in thread]