singe/thirdparty/zlib/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 .. -DZLIB_CRC32VX=off