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Re: FW: Build failed in Jenkins: BuildThunderX_native_gcc_upstream #1267

On 03/17/2017 03:28 PM, Jeff Law wrote:
On 03/17/2017 03:31 PM, Andrew Pinski wrote:
On Fri, Mar 17, 2017 at 11:47 AM, Bernd Schmidt <>
On 03/17/2017 07:38 PM, Pinski, Andrew wrote:

One of the following revision caused a bootstrap comparison failure on

Can you help narrow that down?

I can though I don't want to duplicate work since Jeff was going to
provision an aarch64 system.  My automated testing is approximately
every hour or so; these commits were within an hour window even.
I did not look into the revisions when I write the email but I suspect
r246227 did NOT cause it since aarch64 does not use reload anymore.
My the box I got isn't terribly fast, but regardless I'll be walking
through each commit to see if I can trigger the failure.

246224 tested OK (as it should).

246225 is in progress.

I have access to a fast box that isn't otherwise in use at the moment so I'm taking a look. r246225 builds OK. r246226 does not. So it is Bernd's combine patch. A little experimenting shows that the compare difference is triggered by the use of -gtoggle in stage2, which is not used in stage3. Otherwise stage2 and stage3 generate identical code. The bug is apparently due to a problem with handling debug insns in the combine patch.


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