mirrors/jgit - jgit - source @ dussan.org

Shawn Pearce 982f5d1bf1 Pure Java SHA-1 This implementation is derived straight from the description written in RFC 3174. On Mac OS X with Java 1.8.0_91 it offers similar throughput as MessageDigest SHA-1: system 239.75 MiB/s system 244.71 MiB/s system 245.00 MiB/s system 244.92 MiB/s sha1 234.08 MiB/s sha1 244.50 MiB/s sha1 242.99 MiB/s sha1 241.73 MiB/s This is the fastest implementation I could come up with. Common SHA-1 implementation tricks such as unrolling loops creates a method too large for the JIT to effectively optimize, resulting in lower overall hashing throughput. Using a preprocessor to perform the register renaming of A-E also didn't help, as again the method was too large for the JIT to effectively optimize. Fortunately the fastest version is a naive, straight-forward implementation very close to the description in RFC 3174. Change-Id: I228b05c4a294ca2ad51386cf0e47978c68e1aa42	7年前
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MANIFEST.MF	Pure Java SHA-1	7年前
SOURCE-MANIFEST.MF	Prepare 4.7.0-SNAPSHOT builds	7年前

Shawn Pearce 982f5d1bf1 Pure Java SHA-1

This implementation is derived straight from the description written
in RFC 3174.  On Mac OS X with Java 1.8.0_91 it offers similar
throughput as MessageDigest SHA-1:

  system   239.75 MiB/s
  system   244.71 MiB/s
  system   245.00 MiB/s
  system   244.92 MiB/s

  sha1     234.08 MiB/s
  sha1     244.50 MiB/s
  sha1     242.99 MiB/s
  sha1     241.73 MiB/s

This is the fastest implementation I could come up with.  Common SHA-1
implementation tricks such as unrolling loops creates a method too
large for the JIT to effectively optimize, resulting in lower overall
hashing throughput. Using a preprocessor to perform the register
renaming of A-E also didn't help, as again the method was too large
for the JIT to effectively optimize.

Fortunately the fastest version is a naive, straight-forward
implementation very close to the description in RFC 3174.

Change-Id: I228b05c4a294ca2ad51386cf0e47978c68e1aa42

7年前

MANIFEST.MF

Pure Java SHA-1

7年前

SOURCE-MANIFEST.MF

Prepare 4.7.0-SNAPSHOT builds

7年前