[llvm-dev] RFC: SIMD math-function library

Naoki Shibata via llvm-dev llvm-dev at lists.llvm.org
Thu Jul 14 21:37:47 PDT 2016

Hi all,

Okay, the point is whether Intel will publish the source code for their 
SVML. If Intel will make SVML open-source, there would be not much 
advantage in incorporating SLEEF into LLVM, since it would be also 
fairly easy to port SVML to other architectures. If Intel will not 
open-source SVML, then there could be advantage in using SLEEF for x86 
by inlining the functions.

Is it possible to ask the person in charge what exactly Intel is going 
to contribute?

Naoki Shibata

On 2016/07/15 12:53, Hal Finkel wrote:
> Hi again,
> As this RFC implies, I've been using the SLEEF library proposed here with Clang/LLVM for many years, and fully support its adoption into the LLVM project.
> I'm CC'ing Matt and Xinmin from Intel who have started working on contributing support for their SVML library to LLVM (http://reviews.llvm.org/D19544), and I understand plan to contribute (some subset of) the vector math functions themselves. I'm also excited about Intel's planned contributions.
> Here's how I currently see the situation: Regardless of what Intel contributes, we need a solution in this space for many different architectures. From personal experience, SLEEF is relatively easy to port to different architectures (i.e. different vector ISAs), and has already been ported to several. The performance is good as is the accuracy. I think it would make a great foundation for a vector-math-function runtime library for the LLVM project. I don't know what routines Intel is planning to contribute, or for what architectures they're tuned, but I expect we'll want to use those implementations on x86 platforms where appropriate.
> Matt, Xinmin, what do you think?
> Thanks again,
> Hal

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