rocm-systems

Files

T

Aaron Enye Shi d23b26f760 Update to use new bitcode library structure

Rather than manually linking to the device libraries, the compiler
can now handle linking with them. Allow the build to continue using
old layout if the build system still uses it. Therefore maintain
compatibility with ROCm 3.7 and earlier.

Change-Id: Ida81775da3d0f7c2c67386a71cb057ede31a1545

2020-07-14 15:55:08 -04:00

CMakeLists.txt

Update to use new bitcode library structure

2020-07-14 15:55:08 -04:00

create_hsaco_ascii_file.sh

Update copyright date.

2020-06-19 22:34:01 -04:00

imageblit_kernels.cl

Update copyright date.

2020-06-19 22:34:01 -04:00

README.md

Update to use new bitcode library structure

2020-07-14 15:55:08 -04:00

README.md

OVERVIEW

This directory contains the CMakeLists.txt for automatically generating the ASCII code object file, "opencl_blit_objects.cpp", which contains the blobs of the code object of the Image BLIT kernels for the devices supported on ROCm. The blobs are loaded by the image library and required to update whenever a new device is introduced.

ADD NEW DEVICE

To add a new supported device, the following steps are required:

Declare an extern variable of the device XXX, by adding the line of "extern uint32_t ocl_blit_object_gfxNNN[];" in "blit_kernel.cpp"
Update the BlitKernel::GetPatchedBlitObject() function to support the device by assigning "blit_code_object" to "ocl_blit_object_gfxNNN[]"
Add the gfxNNN to the TARGET_DEVICES list in CMakeLists.txt
If the new device requires XNACK, add it to the XNACK_DEVS list in CMakeLists.txt
Rebuild the image library

REQUIREMENT

In order to create the code object file, the bitcodes of the kernels are generated by the compiler and the following bitcode libraries are required,

opencl.bc ocml.bc irif.bc oclc_correctly_rounded_sqrt_off.bc oclc_daz_opt_on.bc oclc_finite_only_off.bc oclc_isa_version_.bc oclc_unsafe_math_off.bc

where is the gfxip number of the GPU. The directory contains the bitcode libraries is specified in a CMake varaible.

There are several variables are required for CMake to build the code object file. All of them have default values, and defined as following:

  OPENCL_DIR - the location of installed OpenCL
               (Default: /opt/rocm/opencl)
 BITCODE_DIR - the directory contains the bitcode library
               (Default: /opt/rocm/amdgcn/bitcode)
    LLVM_DIR - the directory contains the clang, llvm-link and llvm-dis
               executables
               (Default: ${PROJECT_BUILD_DIR}/../lightning/bin)

TARGET_DEVICES - list of gpu types for kernel builds (eg. "gfx900;gfx902") (Default: "gfx900;gfx902;gfx904")

STEPS TO BUILD

$ make build $ cd build $ cmake -D${OPENCL_DIR} -D${BITCODE_DIR} -D${LLVM_DIR} -D${TARGET_DEVICES} .. $ make opencl_blit_objects.cpp