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Re: New attempt: subword-based DCE, PR42575

From: Peter Bergner <bergner at vnet dot ibm dot com>
To: Bernd Schmidt <bernds at codesourcery dot com>
Cc: David Edelsohn <dje dot gcc at gmail dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Thu, 29 Jul 2010 16:07:19 -0500
Subject: Re: New attempt: subword-based DCE, PR42575
References: <AANLkTi=OAZB8ftiEiT0qW1hejcKXdJc-Bdw+WKRh=1Ry@mail.gmail.com> <4C51D071.9010000@codesourcery.com>

On Thu, 2010-07-29 at 21:03 +0200, Bernd Schmidt wrote:
> On 07/29/2010 08:25 PM, David Edelsohn wrote:
> > This patch may have caused a new bootstrap ICE on PowerPC:
> > 
> > /farm/dje/src/src/gcc/cfg.c: In function 'scale_bbs_frequencies_gcov_type':
> > /farm/dje/src/src/gcc/cfg.c:1109:1: internal compiler error: in
> > delete_corresponding_reg_eq_notes, at dce.c:495
> > 
> > I see the error on powerpc-ibm-aix5.3 and I was told the error also
> > occurs on powerpc-darwin.
> 
> Can you test the following patch?  This makes sure we clear some DF
> flags during DCE, and while I was there I also made the whole thing
> conditional on flag_dce for consistency.

I tested this on powerpc64-linux and it does fix the bootstrap failure.

Peter

References:
- Re: New attempt: subword-based DCE, PR42575
  - From: David Edelsohn
- Re: New attempt: subword-based DCE, PR42575
  - From: Bernd Schmidt

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