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Re: [patch AArch64] Do not perform a vector splat for vector initialisation if it is not useful

From: Segher Boessenkool <segher at kernel dot crashing dot org>
To: Richard Biener <richard dot guenther at gmail dot com>
Cc: kyrylo dot tkachov at foss dot arm dot com, GCC Patches <gcc-patches at gcc dot gnu dot org>, Richard Earnshaw <richard dot earnshaw at arm dot com>, james dot greenhalgh at arm dot com, Marcus Shawcroft <marcus dot shawcroft at arm dot com>
Date: Wed, 16 May 2018 09:34:12 -0500
Subject: Re: [patch AArch64] Do not perform a vector splat for vector initialisation if it is not useful
References: <5AFA983C.5070609@foss.arm.com> <CAFiYyc2SGOdaYDTG7q-pWKAmt2BzYUyMUWDPJhCfMFUohi38WA@mail.gmail.com> <5AFBEDD5.5020004@foss.arm.com> <CAFiYyc05XY13gGuLL1MEpbxEb54FuMgXzSCBwTmFd06vMTfD6Q@mail.gmail.com>

On Wed, May 16, 2018 at 11:42:39AM +0200, Richard Biener wrote:
> Works for me.  Were you able to actually create such RTL from testcases?
> Segher, do you know where canonicalization rules are documented?
> IIRC we do not actively try to canonicalize in most cases.

md.texi, node "Insn Canonicalizations"?


Segher

References:
- [patch AArch64] Do not perform a vector splat for vector initialisation if it is not useful
  - From: Kyrill Tkachov
- Re: [patch AArch64] Do not perform a vector splat for vector initialisation if it is not useful
  - From: Richard Biener
- Re: [patch AArch64] Do not perform a vector splat for vector initialisation if it is not useful
  - From: Kyrill Tkachov
- Re: [patch AArch64] Do not perform a vector splat for vector initialisation if it is not useful
  - From: Richard Biener

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