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Re: Fix heisenbug in combine.c

From: Eric Christopher <echristo at redhat dot com>
To: Zack Weinberg <zack at codesourcery dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Tue, 29 Jun 2004 20:57:28 -0700
Subject: Re: Fix heisenbug in combine.c
References: <87fz8dyghz.fsf@taltos.codesourcery.com> <1088566819.10056.76.camel@dzur.sfbay.redhat.com> <874qotyae1.fsf@taltos.codesourcery.com>

On Tue, 2004-06-29 at 20:47, Zack Weinberg wrote:
> Eric Christopher <echristo@redhat.com> writes:
> 
> >> There was no range check on the access to the global_regs[] array.
> >> Accordingly, whenever we hit this point with a pseudo, combine would
> >> randomly decide not to delete a dead insn.  One of my IMA patches
> >> provoked this into causing bootstrap comparison failures - frankly I'm
> >> surprised no one noticed earlier.
> >
> > This may be what was causing bootstrap failures with my last combine
> > patch on 3.4 and 3.3. Can you check please?
> 
> I'm juggling about five tasks at the moment, sorry.

OK. I'll look into it then.

-eric

-- 
Eric Christopher <echristo@redhat.com>

References:
- Fix heisenbug in combine.c
  - From: Zack Weinberg
- Re: Fix heisenbug in combine.c
  - From: Eric Christopher
- Re: Fix heisenbug in combine.c
  - From: Zack Weinberg

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