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Re: [PATCH], PR target/81593, Optimize PowerPC vector sets coming from a vector extracts

From: Marc Glisse <marc dot glisse at inria dot fr>
To: Andrew Pinski <pinskia at gmail dot com>
Cc: Richard Biener <richard dot guenther at gmail dot com>, Michael Meissner <meissner at linux dot vnet dot ibm dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>, Segher Boessenkool <segher at kernel dot crashing dot org>, David Edelsohn <dje dot gcc at gmail dot com>, Bill Schmidt <wschmidt at linux dot vnet dot ibm dot com>
Date: Fri, 28 Jul 2017 10:37:42 +0200 (CEST)
Subject: Re: [PATCH], PR target/81593, Optimize PowerPC vector sets coming from a vector extracts
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References: <20170727232113.GA8723@ibm-tiger.the-meissners.org> <CAFiYyc25scmKSFByaB1HEfWr2MaTdsig0O_GTZ28CN=jLX-DGg@mail.gmail.com> <CA+=Sn1mVLodS6T0-Neg9aBvvn8vNhNxKYph9Qt7yOEu4-w=Kdg@mail.gmail.com>
Reply-to: gcc-patches at gcc dot gnu dot org

On Fri, 28 Jul 2017, Andrew Pinski wrote:

For the vector case, can't we write it as:
_1 = BIT_FIELD_REF <high_4(D), 64, 64>;
_2 = BIT_FIELD_REF <low_7(D), 64, 0>;
res_8 = {_1, _2};

And then have some match.pd patterns (which might get complex), to
rewrite that into VEC_PERM_EXPR?

For this last part, we have simplify_vector_constructor intree-ssa-forwprop.c, which currently only recognizes VEC_PERM_EXPR of asingle vector, but I guess it could be extended to 2 vectors. Not as goodas a bswap revamp (which will be needed anyway at some point), but lesswork.


--
Marc Glisse

References:
- [PATCH], PR target/81593, Optimize PowerPC vector sets coming from a vector extracts
  - From: Michael Meissner
- Re: [PATCH], PR target/81593, Optimize PowerPC vector sets coming from a vector extracts
  - From: Richard Biener
- Re: [PATCH], PR target/81593, Optimize PowerPC vector sets coming from a vector extracts
  - From: Andrew Pinski

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