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Re: [PATCH] Enhance PHI processing in VN
- From: David Edelsohn <dje dot gcc at gmail dot com>
- To: Richard Biener <rguenther at suse dot de>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 15 Sep 2017 06:39:57 -0400
- Subject: Re: [PATCH] Enhance PHI processing in VN
- Authentication-results: sourceware.org; auth=none
- References: <CAGWvny=TGKExumJgnf1OuWdvWSU5ZRMSXhAVfhz6vQN0XGMiUg@mail.gmail.com> <alpine.LSU.2.20.1709150850580.26836@zhemvz.fhfr.qr>
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