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Re: [x86, 6/n] Replace builtins with vector extensions

From: Marc Glisse <marc dot glisse at inria dot fr>
To: Kirill Yukhin <kirill dot yukhin at gmail dot com>
Cc: Uros Bizjak <ubizjak at gmail dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Tue, 11 Nov 2014 10:28:18 +0100 (CET)
Subject: Re: [x86, 6/n] Replace builtins with vector extensions
Authentication-results: sourceware.org; auth=none
References: <alpine dot DEB dot 2 dot 02 dot 1411091657560 dot 1543 at stedding dot saclay dot inria dot fr> <CAFULd4brijRH6Xxme6tOzqBSzV75eYZyiV=WPB5xcQB4QiSUYA at mail dot gmail dot com> <20141111092415 dot GA31411 at msticlxl57 dot ims dot intel dot com>

On Tue, 11 Nov 2014, Kirill Yukhin wrote:

Hello Marc, UroÅ,
On 10 Nov 21:33, Uros Bizjak wrote:

On Sun, Nov 9, 2014 at 5:26 PM, Marc Glisse <marc.glisse@inria.fr> wrote:

Hello,

< > and == for integer vectors of size 128. I was surprised not to find
_mm_cmplt_epi64 anywhere. Note that I can do the same for size 256, but not
512, there is no corresponding intrinsic, there are only _mask versions that
return a mask.


Let's ask Kirill (CC'd) about missing intrinsics.

We have no `_mm_cmplt_epi64' intrinsic because there's no suchinstruction in Intel ISA.


We have _mm_cmplt_epi32 without a corresponding instruction though ;-)
(yes, it is useless)

All we have is [V]PCMP[EQ|GT] on pre-AVX-512* and VPCMP starting from
AVX-512*.
VPCMP is able to model VPCMPLT by specifiyng corresponding immediate and we
have intrinsics for that (config/i386/avx512fintrin.h):
	extern __inline __mmask16
	__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
	_mm512_cmplt_epu32_mask (__m512i __X, __m512i __Y)


--
Marc Glisse

Follow-Ups:
- Re: [x86, 6/n] Replace builtins with vector extensions
  - From: Kirill Yukhin

References:
- [x86, 6/n] Replace builtins with vector extensions
  - From: Marc Glisse
- Re: [x86, 6/n] Replace builtins with vector extensions
  - From: Uros Bizjak
- Re: [x86, 6/n] Replace builtins with vector extensions
  - From: Kirill Yukhin

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