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3 Commits

Author SHA1 Message Date
Eric Biggers
ea88fa822f lib/arm/crc32: add support for ARM CRC32 instructions 
Add a CRC32 implementation that uses the ARM CRC32 instructions.

This is simpler and faster than the PMULL implementation.  On AWS
Graviton2, the performance improvement is about 70%.  On Hikey960, the
performance improvement is about 30% for the Cortex-A53 cores or about
5% for the Cortex-A73 cores.

Based on work by Greg V <greg@unrelenting.technology>
(https://github.com/ebiggers/libdeflate/pull/45)
and Andrew Steinborn <git@steinborn.me>
(https://github.com/ebiggers/libdeflate/pull/76).
 2020-10-10 23:03:50 -07:00
Eric Biggers
7373bdc9ff lib/arm/cpu_features: reorganize arm feature macros 
Reorganize up some confusing logic.
 2020-10-10 23:03:50 -07:00
Eric Biggers
fc2ea22b44 lib/arm: add ARM PMULL implementation of CRC-32 
Add an ARM PMULL implementation of CRC-32.  This is based on a patch by
Jun He <jun.he@linaro.org> as well as the x86 PCLMUL implementation.
 2018-02-18 23:03:26 -08:00