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Re: [PATCH, ARM] Support NEON's VABD with combine pass
- From: Ramana Radhakrishnan <ramana dot radhakrishnan at linaro dot org>
- To: Dmitry Melnik <dm at ispras dot ru>
- Cc: gcc-patches at gcc dot gnu dot org, Richard Earnshaw <rearnsha at arm dot com>, Andrey Belevantsev <abel at ispras dot ru>
- Date: Mon, 12 Sep 2011 18:00:58 +0100
- Subject: Re: [PATCH, ARM] Support NEON's VABD with combine pass
- References: <4E328459.8090206@ispras.ru> <CACUk7=XdT1FwkkssQDqSPDA9SiAFsQ2m_EenKLuNGF5Y_vu56w@mail.gmail.com> <4E6E2F47.4050406@ispras.ru>
On 12 September 2011 17:11, Dmitry Melnik <dm@ispras.ru> wrote:
>
>> Interesting but I would be a bit defensive and make sure that this
>> matches only if -ffast-math in the FP case. You are sort of relying on
>> the fact that vsub wouldn't be generated without ffast-math but I'd
>> rather be defensive about it . (This is in case it's not clear in the
>> non-intrinsics case).
>
> Fixed.
>>
>> BTW was SPEC2k built with -Ofast ? Maybe then you'll see a bit of
>> vectorization.
>
> Yes, I built it with -Ofast. I think it's because SPEC2K tests mostly use
> doubles, which are not supported by vabd.
OK.
cheers
Ramana