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go / go / 2027b00e63d9128eaba4a0164072380561c0fc9c
commit2027b00e63d9128eaba4a0164072380561c0fc9c[log] [tgz]
authorKlaus Post <klauspost@gmail.com>Sun Aug 30 22:29:00 2015 +0200
committerKeith Randall <khr@golang.org>Wed Sep 16 15:42:42 2015 +0000
tree695d5e7e309a640313266ce833f22c52ce49206a
parentf0ea976ee4591785fb028b77bcd02fb8590650ed [diff]
hash/crc32: add AMD64 optimized IEEE CRC calculation

IEEE is the most commonly used CRC-32 polynomial, used by zip, gzip and others.

Based on http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/fast-crc-computation-generic-polynomials-pclmulqdq-paper.pdf

benchmark                       old ns/op     new ns/op     delta
BenchmarkIEEECrc1KB-8           3193          352           -88.98%
BenchmarkIEEECrc4KB-8           5025          1307          -73.99%
BenchmarkCastagnoliCrc1KB-8     126           126           +0.00%

benchmark                       old MB/s     new MB/s     speedup
BenchmarkIEEECrc1KB-8           320.68       2901.92      9.05x
BenchmarkIEEECrc4KB-8           815.08       3131.80      3.84x
BenchmarkCastagnoliCrc1KB-8     8100.80      8109.78      1.00x

Change-Id: I99c9a48365f631827f516e44f97e86155f03cb90
Reviewed-on: https://go-review.googlesource.com/14080
Reviewed-by: Keith Randall <khr@golang.org>
5 files changed
tree: 695d5e7e309a640313266ce833f22c52ce49206a
  1. api/
  2. doc/
  3. lib/
  4. misc/
  5. src/
  6. test/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. CONTRIBUTING.md
  11. CONTRIBUTORS
  12. favicon.ico
  13. LICENSE
  14. PATENTS
  15. README.md
  16. robots.txt
README.md

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