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-The zero point data type is different based on the downscale data type. For int8_t downscale type, zero point type is int8_t whereas for uint8_t downscale type, it is uint8_t. During downscale post-op, the micro-kernels upscales the zero point from its data type (int8_t or uint8_t) to that of the accumulation data type and then performs the zero point addition. The accumulated output is then stored as downscaled type in a later storage phase. For the <u|s>8s8s16 micro-kernels, the upscaling to int16_t (accumulation type) is always performed assuming the zero point is int8_t using the _mm256_cvtepi8_epi16 instruction. However this will result in incorrect upscaled zero point values if the downscale type is uint8_t and the associated zero point type is also uint8_t. This issue is corrected by switching between the correct upscale instruction based on the zero point type. AMD-Internal: [SWLCSG-2500] Change-Id: I92eed4aed686c447d29312836b9e551d6dd4b076
AOCL-BLAS library
AOCL-BLAS is AMD's optimized version of BLAS targeted for AMD EPYC and Ryzen CPUs. It is developed as a forked version of BLIS (https://github.com/flame/blis), which is developed by members of the Science of High-Performance Computing (SHPC) group in the Institute for Computational Engineering and Sciences at The University of Texas at Austin and other collaborators (including AMD). All known features and functionalities of BLIS are retained and supported in AOCL-BLAS library. AOCL-BLAS is regularly updated with the improvements from the upstream repository.
AOCL BLAS is optimized with SSE2, AVX2, AVX512 instruction sets which would be enabled based on the target Zen architecture using the dynamic dispatch feature. All prominent Level 3, Level 2 and Level 1 APIs are designed and optimized for specific paths targeting different size spectrums e.g., Small, Medium and Large sizes. These algorithms are designed and customized to exploit the architectural improvements of the target platform.
For detailed instructions on how to configure, build, install, and link against AOCL-BLAS on AMD CPUs, please refer to the AOCL User Guide located on AMD developer portal.
The upstream repository (https://github.com/flame/blis) contains further information on BLIS, including background information on BLIS design, usage examples, and a complete BLIS API reference.
AOCL-BLAS is developed and maintained by AMD. You can contact us on the email-id toolchainsupport@amd.com. You can also raise any issue/suggestion on the git-hub repository at https://github.com/amd/blis/issues.