- update to 1.20:
* Improved CRC-32 performance on recent x86 CPUs by adding
* VPCLMULQDQ-accelerated implementations using 256-bit and
512-bit vectors.
* Improved Adler-32 performance on recent x86 CPUs by adding
* VNNI-accelerated implementations using 256-bit and 512-bit
vectors.
* Improved CRC-32 and Adler-32 performance on short inputs.
* Optimized the portable implementation of Adler-32.
* Added some basic optimizations for RISC-V.
* Dropped support for gcc versions older than v4.9 (released in
2014) and clang versions older than v3.9 (released in 2016).
* Dropped support for CRC-32 acceleration on 32-bit ARM using
the ARMv8 pmull or crc32 instructions.