llvm dev - Nov 2019 - AMDGPU and math functions

Does anyone know whether there is yet support for math functions in AMD 
GPU kernels?

In the NVIDIA world they provide the libdevice IR module which can be 
linked to an existing module containing the kernel. In other words they 
provide all math functions on IR level. NVIDIA even claims that 
libdevice is actually device specific (compute capability).

I was wondering how that is done on the AMD side of things.

Thanks,

Frank

Brian, this seems like a good question for you.

On Wed, Nov 13, 2019 at 9:51 PM Frank Winter via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> Does anyone know whether there is yet support for math functions in AMD
> GPU kernels?
>
> In the NVIDIA world they provide the libdevice IR module which can be
> linked to an existing module containing the kernel. In other words they
> provide all math functions on IR level. NVIDIA even claims that
> libdevice is actually device specific (compute capability).
>
> I was wondering how that is done on the AMD side of things.
>
> Thanks,
>
> Frank
>
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev


-- 
Lerne, wie die Welt wirklich ist,
aber vergiss niemals, wie sie sein sollte.

There certainly is support; after all AMD supports both OpenCL and HIP (a
dialect of C++ very close to cuda).

AMD device libraries (in bitcode form) are installed when ROCm (
https://rocm.github.io/ ) is installed.

AMD device libraries are mostly written in (OpenCL) C and open source at
https://github.com/RadeonOpenCompute/ROCm-Device-Libs .  They are configured by
linking in a number tiny libraries that define global constants; these allow
unwanted code including branches to be eliminated during post-bitcode-link
optimization.

Regards,
Brian

-----Original Message-----
From: Nicolai Hähnle <nhaehnle at gmail.com> 
Sent: Wednesday, November 13, 2019 12:57 PM
To: Frank Winter <fwinter at jlab.org>; Sumner, Brian <Brian.Sumner at
amd.com>
Cc: LLVM Dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] AMDGPU and math functions

[CAUTION: External Email]

Brian, this seems like a good question for you.

On Wed, Nov 13, 2019 at 9:51 PM Frank Winter via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
>
> Does anyone know whether there is yet support for math functions in 
> AMD GPU kernels?
>
> In the NVIDIA world they provide the libdevice IR module which can be 
> linked to an existing module containing the kernel. In other words 
> they provide all math functions on IR level. NVIDIA even claims that 
> libdevice is actually device specific (compute capability).
>
> I was wondering how that is done on the AMD side of things.
>
> Thanks,
>
> Frank
>
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev


--
Lerne, wie die Welt wirklich ist,
aber vergiss niemals, wie sie sein sollte.