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Add optimized crc32 for Power 8+ processors #857

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Add optimized crc32 for Power 8+ processors #857

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Commits on Sep 15, 2023

  1. Preparation for Power optimizations 

    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 <[email protected]>
Author: Rogerio Alves <[email protected]>
Signed-off-by: Manjunath Matti <[email protected]>
    Manjunath S Matti committed Sep 15, 2023
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  2. Add Power8+ optimized crc32 

    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
<[email protected]>

It makes use of vector instructions to speed up CRC32 algorithm.

Author: Rogerio Alves <[email protected]>
Signed-off-by: Manjunath Matti <[email protected]>
    Manjunath S Matti committed Sep 15, 2023
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  3. Fix clang's behavior on versions >= 7 

    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 <[email protected]>
Signed-off-by: Manjunath Matti <[email protected]>
    Manjunath S Matti committed Sep 15, 2023
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