Add optimized crc32 for Power 8+ processors #857
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added 3 commits
September 15, 2023 11:38
Optimized functions for Power will make use of GNU indirect functions, an extension to support different implementations of the same function, which can be selected during runtime. This will be used to provide optimized functions for different processor versions. Since this is a GNU extension, we placed the definition of the Z_IFUNC macro under `contrib/gcc`. This can be reused by other archs as well. Author: Matheus Castanho <msc@linux.ibm.com> Author: Rogerio Alves <rcardoso@linux.ibm.com> Signed-off-by: Manjunath Matti <mmatti@linux.ibm.com>
This commit adds an optimized version for the crc32 function based on crc32-vpmsum from https://github.com/antonblanchard/crc32-vpmsum/ This is the C implementation created by Rogerio Alves <rogealve@br.ibm.com> It makes use of vector instructions to speed up CRC32 algorithm. Author: Rogerio Alves <rcardoso@linux.ibm.com> Signed-off-by: Manjunath Matti <mmatti@linux.ibm.com>
Clang 7 changed the behavior of vec_xxpermdi in order to match GCC's behavior. After this change, code that used to work on Clang 6 stopped to work on Clang >= 7. Tested on Clang 6, 7, 8 and 9. Reference: https://bugs.llvm.org/show_bug.cgi?id=38192 Signed-off-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> Signed-off-by: Manjunath Matti <mmatti@linux.ibm.com>
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@madler: Can you look this PR? |
This was referenced Jan 20, 2024
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This is a pull request to include all Power8 optimisations rebased to v1.3
Issue #847 and the reference PR's are #750 ( Power8 optimisations rebased to v1.2.13) and #478.