[cfe-dev] [RFC] Introduce HIP language mode

Tom Stellard via cfe-dev cfe-dev at lists.llvm.org
Mon Apr 2 09:25:44 PDT 2018

On 03/28/2018 12:29 PM, Liu, Yaxun (Sam) via cfe-dev wrote:
> HIP is a language similar to CUDA (https://github.com/ROCm-Developer-Tools/HIP/blob/master/docs/markdown/hip_kernel_language.md  ).
> The language syntax is very similar, which allows a hip program to be compiled as a CUDA program by Clang. The main difference
> is the host API. HIP has a set of vendor neutral host API which can be implemented on different platforms. Currently there is open source
> implementation of HIP runtime on amdgpu target (https://github.com/ROCm-Developer-Tools/HIP ).

What's the relationship between the HIP language mode and hcc?  Is the
HIP language mode intended to replace the current hip + hcc stack?


> We have a working implementation of HIP compiler based on clang thanks to Greg Rodgers' work and we would like to upstream it. As an initial step, we created a Phabricator
> Review https://reviews.llvm.org/D44984 for adding support of file type hip and language option HIP.
> When hip file is compiled, both LangOpts.CUDA and LangOpts.HIP is turned on. This allows compilation of hip program as CUDA
> in most cases and only special handling of hip program is needed LangOpts.HIP is checked.
> This patch also adds support of kernel launching of HIP program using HIP host API.
> The next patch will be the toolchain changes to support HIP. Basically HIP has its own open source header files and device libraries which may be ported to different targets/platforms.
> We plan to continue upstreaming our support of HIP until it becomes mature enough to support major machine learning applications ported to HIP, e.g. TensorFlow https://github.com/ROCmSoftwarePlatform/tensorflow .
> Any comments are welcome.
> Thanks.
> Yaxun (Sam) Liu
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