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*From*: "Carlos O'Donell" <carlos at redhat dot com>*To*: "H.J. Lu" <hjl dot tools at gmail dot com>*Cc*: Andrew Senkevich <andrew dot n dot senkevich at gmail dot com>, "Joseph S. Myers" <joseph at codesourcery dot com>, libc-alpha <libc-alpha at sourceware dot org>*Date*: Thu, 25 Sep 2014 16:48:43 -0400*Subject*: Re: [RFC] How to add vector math functions to Glibc*Authentication-results*: sourceware.org; auth=none*References*: <CAMXFM3tjquzniXP1weqxSVFJyhXqsf2PHuyrrrmqp7K0ZzORqA at mail dot gmail dot com> <CAMXFM3sGMNX1DEPAMt7qUR4UREF_xUAQjCG1OjBiZH2aoOFiPA at mail dot gmail dot com> <Pine dot LNX dot 4 dot 64 dot 1409181551370 dot 31607 at digraph dot polyomino dot org dot uk> <CAMXFM3tO7MTYCq8-YFZacdbLvR4iAab_n04AuB+rp2Phs4BvQg at mail dot gmail dot com> <Pine dot LNX dot 4 dot 64 dot 1409242011260 dot 7597 at digraph dot polyomino dot org dot uk> <CAMXFM3tqiqUNuSU2KXvAFM-QescX3+6xUO9=z5X0Ac6C9qJ7zg at mail dot gmail dot com> <CAMe9rOq7bZHb8R=opUzSmAMGWjLpX21mR=Sx96cuBph=TTtDXA at mail dot gmail dot com> <54246CB5 dot 7020908 at redhat dot com> <CAMe9rOoLmJ2jHWmERoB0M83WNKovJOgh0--Kquw9O86A1tPU0g at mail dot gmail dot com> <5424733D dot 6010305 at redhat dot com> <CAMe9rOpacze055qyBFzz3M-b-GNtXCqZzMmkScBL9a94zVj28g at mail dot gmail dot com>

On 09/25/2014 04:03 PM, H.J. Lu wrote: >> Sorry, I don't understand this part, and perhaps that's why I didn't >> understand question 7 in the previous post. >> >> What does it mean for the vector library to target GCC? >> > > From > > https://sourceware.org/glibc/wiki/libm#Addition_of_x86_64_vector_math_functions_to_Glibc Thanks for the pointer. I understand now. > 3.1. Goal > > Main goal is to improve vectorization of GCC with OpenMP4.0 SIMD > constructs (#2.8 in http://www.openmp.org/mp-documents/OpenMP4.0.0.pdf > and Cilk Plus constructs (#6-8 in > http://www.cilkplus.org/sites/default/files/open_specifications/Intel_Cilk_plus_lang_spec_1.2.htm) > on x86_64 by adding SSE4, AVX and AVX2 vector implementations of > several vector math functions (float and double versions). AVX-512 > versions are planned to be added later. These functions can be also > used manually (with intrinsics) by developers to obtain speedup. > > So it is mainly for GCC. The only counter-argument to that is that a single implementation in glibc can be shared by gcc and llvm or any other compiler. As noted in "3.5 Open questions, a." Intel needs to decide where they want this piece of technology to reside. I don't know that the community can make this choice for Intel. The community is ready to work with Intel to implement this in glibc. I've tried to clarify a few of these: https://sourceware.org/glibc/wiki/libm#Open_questions Cheers, Carlos.

**Follow-Ups**:**Re: [RFC] How to add vector math functions to Glibc***From:*Andrew Senkevich

**Re: [RFC] How to add vector math functions to Glibc***From:*H.J. Lu

**References**:**[RFC] How to add vector math functions to Glibc***From:*Andrew Senkevich

**Re: [RFC] How to add vector math functions to Glibc***From:*Andrew Senkevich

**Re: [RFC] How to add vector math functions to Glibc***From:*Joseph S. Myers

**Re: [RFC] How to add vector math functions to Glibc***From:*Andrew Senkevich

**Re: [RFC] How to add vector math functions to Glibc***From:*Joseph S. Myers

**Re: [RFC] How to add vector math functions to Glibc***From:*Andrew Senkevich

**Re: [RFC] How to add vector math functions to Glibc***From:*H.J. Lu

**Re: [RFC] How to add vector math functions to Glibc***From:*Carlos O'Donell

**Re: [RFC] How to add vector math functions to Glibc***From:*H.J. Lu

**Re: [RFC] How to add vector math functions to Glibc***From:*Carlos O'Donell

**Re: [RFC] How to add vector math functions to Glibc***From:*H.J. Lu

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