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07f2d4237e
Use vector extensions when compiling for s390x and binutils knows about them. At runtime, check whether kernel supports vector extensions (it has to be not just the CPU, but also the kernel) and choose between the regular and the vectorized implementations. Co-authored-by: Eduard Stefes <eddy@linux.ibm.com>
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