Compute CRC32C on ARM using the Crypto Extension where available In similar vein to commit 3c6e8c123, the ARMv8 cryptography extension has 64x64 -> 128-bit carryless multiplication instructions suitable for computing CRC. This was tested to be around twice as fast as scalar CRC instructions for longer inputs.
We now do a runtime check, even for builds that target "armv8-a+crc", but those builds can still use a direct call for constant inputs, which we assume are short. As for x86, the MIT-licensed implementation was generated with the "generate" program from https://github.com/corsix/fast-crc32/ Reviewed-by: Nathan Bossart <[email protected]> Discussion: https://postgr.es/m/CANWCAZaKhE+RD5KKouUFoxx1EbUNrNhcduM1VQ=dksdadne...@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/fbc57f2bc2ee498958a4c5326002af39dd99c90b Modified Files -------------- config/c-compiler.m4 | 38 +++++++++++ configure | 64 ++++++++++++++++++- configure.ac | 13 +++- meson.build | 33 ++++++++++ src/include/pg_config.h.in | 3 + src/include/port/pg_crc32c.h | 22 +++++-- src/port/meson.build | 1 + src/port/pg_crc32c_armv8.c | 128 ++++++++++++++++++++++++++++++++++++++ src/port/pg_crc32c_armv8_choose.c | 38 ++++++++++- 9 files changed, 329 insertions(+), 11 deletions(-)
