| 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 |