archived/ptlibzippy/contrib/crc32vx/README


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IBM Z mainframes starting from version z13 provide vector instructions, which 
allows vectorization of crc32. This extension is build by default when targeting
ibm s390x. However this extension can disabled if desired:

    # for configure build
    $ ./configure --disable-crcvx

    # for cmake build
    $ cmake .. -DPTLIBZIPPY_CRC32VX=off