Porting Cuda Codes to HIP

HIP: Heterogeneous Interface for Portability is developed by AMD to program on AMD GPUs.

ROCm environment offers two automated methods for automatically converting CUDA projects to HIP: Hipify perl a Perl script you can run on the CUDA source code to convert it to HIP format and Hipify clang a preprocessor that operates from within the HIP/ Clang compiler tool chain, converting the code as a preliminary step within the compiler process.

The hipify perl script acts directly on the CUDA source code using a series of simple string replacements. Ex., (sed e ’s/cuda/hip/g’)

To convert a CUDA file (foo.cu , for example) to HIP format, enter the following after loading a ROCm module:

Terminal N. Loading ROCm module and using the hipify-perl tool for translating the code from CUDA to HIP

$ module load rocm/<version>
$ hipify-perl foo.cu > new_foo.cpp

You can then compile the HIP ready . cpp file for the ROCm environment using the HIP/ Clang compiler provided in the ROCm installation:

Terminal N. Compiling the code with hipcc

$ hipcc new_foo.cpp

There are several other utility scripts and options available to support the porting of codes:

$ echo $(hipconfig --path)
$ findcode.sh hipcc hipconfig hipconvertinplace.sh hip_embed_pch.sh hipexamine.sh hipify-perl roc-obj-extract finduncodep.sh hipcc_cmake_linker_helper hipconvertinplace-perl.sh hipdemangleatp hipexamine-perl.sh hipify-cmakefile hipvars.pm roc-obj-ls

For example, hipify-perl inplace option saves the HIP version of the code in the same file. The original CUDA code is saved in the backup file .prehip:

Terminal N. Compiling the code with hipcc

$ hipify-perl -inplace <filename>

$ hipexamine-perl.sh <filename/directory>
This script will scan a file/directory to determine which file/files contain CUDA code and how much of that code can be automatically hipified.

$ hipconvertinplace-perl.sh <directory>
It converts all the related files that are located inside the directory

for more information see HIP/hip_programming_guide.md at develop · ROCm-Developer-Tools/HIP · GitHub, HIP/hip_porting_guide.md at develop · ROCm-Developer-Tools/HIP · GitHub, HIPIFY/README.md at master · ROCm-Developer-Tools/HIPIFY · GitHub