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Re: [PATCH] Enhance PHI processing in VN


On Fri, Sep 15, 2017 at 2:53 AM, Richard Biener <rguenther@suse.de> wrote:
> On Thu, 14 Sep 2017, David Edelsohn wrote:
>
>> * tree-ssa-sccvn.c (visit_phi): Merge undefined values similar
>> to VN_TOP.
>>
>> This seems to have regressed
>>
>> FAIL: gcc.dg/tree-prof/time-profiler-2.c scan-ipa-dump-times profile
>> "Read tp_first_run: 0" 2
>> FAIL: gcc.dg/tree-prof/time-profiler-2.c scan-ipa-dump-times profile
>> "Read tp_first_run: 2" 1
>> FAIL: gcc.dg/tree-prof/time-profiler-2.c scan-ipa-dump-times profile
>> "Read tp_first_run: 3" 1
>
> Hmm, I don't see these FAILs.  Looking at the testcase there are
> no undefined uses so I wonder how the patch could have any effect.
>
> Can you re-check and open a bugreport?

It disappeared again.  A different failure appeared and disappeared a
few weeks ago.  Something in the testsuite infrastructure appears to
not be stable, at least on AIX.  Sorry for the incorrect report.

- David


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