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Re: bootstrap comparison failure ppc64 FreeBSD
- From: Peter Bergner <bergner at vnet dot ibm dot com>
- To: Andreas Tobler <andreast-list at fgznet dot ch>
- Cc: GCC Mailing List <gcc at gcc dot gnu dot org>
- Date: Wed, 14 Nov 2012 14:57:03 -0600
- Subject: Re: bootstrap comparison failure ppc64 FreeBSD
- References: <50A3DA13.3090200@fgznet.ch>
On Wed, 2012-11-14 at 18:51 +0100, Andreas Tobler wrote:
> Hello,
>
> on trunk (193501) I get a comparison failure:
> ---
> Bootstrap comparison failure!
> gcc/tree-ssa-forwprop.o differs
> ---
>
> This is with --disable-checking. Leaving disable-checking away, the
> bootstrap completes succesfully.
I just fired off a --disable-checking build and I see the same
thing on powerpc64-linux.
> - 9658: e8 89 00 09 ldu r4,8(r9)
> - 965c: 39 08 00 01 addi r8,r8,1
> + 9658: 39 08 00 01 addi r8,r8,1
> + 965c: e8 89 00 09 ldu r4,8(r9)
Looks like a harmless scheduling difference, but enough trigger
the stage2/stage3 comparison. :(
Peter