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Re: bootstrap comparison failure ppc64 FreeBSD
- From: Andreas Tobler <andreast-list at fgznet dot ch>
- To: Peter Bergner <bergner at vnet dot ibm dot com>
- Cc: GCC Mailing List <gcc at gcc dot gnu dot org>
- Date: Thu, 15 Nov 2012 19:23:29 +0100
- Subject: Re: bootstrap comparison failure ppc64 FreeBSD
- References: <50A3DA13.3090200@fgznet.ch> <1352926623.17833.10.camel@otta>
On 14.11.12 21:57, Peter Bergner wrote:
> 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. :(
Thank you for confirming. I'll try to bisect this weekend. My last good
results are from November 2nd.
Andreas