Re: [PATCH] Relax check against commuting XOR and ASHIFTRT in combine.c

[Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>]

Hi Alan,

>> I'm still not really comfortable with those target lists; they tend to
>> artificially exclude tests on targets where they are perfectly capable
>> of running.  At least with the comments added, it's better than before
>> with no explanation whatsoever.  Perhaps Mike can weigh in here?
>
> Well, it's been awhile, but on further reflection - my feeling is that we
> should be dropping the target lists here too. Maybe we end up introducing a
> dg-skip-if that grows over time, but it'd have to grow quite a bit to reach
> the size of the dg-do target we'd otherwise have...

It's not even necessary to use dg-skip if the scan-rtl-dump fails.  You
can just add an xfail there, which has the advantage that you do notice
if the test starts to pass e.g. due to changes in a target.

> However I am a bit wary about dropping the dg-do target constraint just as
> we are nearing a release! So if we were to keep the whitelist approach,
> your patch looks good to me, and I'd be happy if that were committed.

Let's give others a day or two to comment: if nobody is in favour of the
more agressive approach, I'll commit my patch.

Thanks.
        Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University