qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-10-04 06:31:22 -06:00
Code Releases Activity
e1cf7d6fb6
go/src/pkg/hash
History
Nigel Tao 60ffae25bc hash/adler32: optimize. 
The bulk of the gains come from hoisting the modulo ops outside of
the inner loop.

Reducing the digest type from 8 bytes to 4 bytes gains another 1% on
the hash/adler32 micro-benchmark.

Benchmarks for $GOOS,$GOARCH = linux,amd64 below.

hash/adler32 benchmark:
benchmark             old ns/op    new ns/op    delta
BenchmarkAdler32KB         1660         1364  -17.83%

image/png benchmark:
benchmark                       old ns/op    new ns/op    delta
BenchmarkDecodeGray               2466909      2425539   -1.68%
BenchmarkDecodeNRGBAGradient      9884500      9751705   -1.34%
BenchmarkDecodeNRGBAOpaque        8511615      8379800   -1.55%
BenchmarkDecodePaletted           1366683      1330677   -2.63%
BenchmarkDecodeRGB                6987496      6884974   -1.47%
BenchmarkEncodePaletted           6292408      6040052   -4.01%
BenchmarkEncodeRGBOpaque         19780680     19178440   -3.04%
BenchmarkEncodeRGBA              80738600     79076800   -2.06%

Wall time for Denis Cheremisov's PNG-decoding program given in
https://groups.google.com/group/golang-nuts/browse_thread/thread/22aa8a05040fdd49
Before: 2.44s
After:  2.26s
Delta:  -7%

R=rsc
CC=golang-dev
https://golang.org/cl/6251044
2012-05-25 09:58:38 +10:00
..
adler32 hash/adler32: optimize. 2012-05-25 09:58:38 +10:00
crc32 hash: more efficient memory allocation 2012-04-10 15:15:39 -04:00
crc64 hash: more efficient memory allocation 2012-04-10 15:15:39 -04:00
fnv hash: more efficient memory allocation 2012-04-10 15:15:39 -04:00
hash.go crypto/hmac: Add HMAC-SHA224 and HMAC-SHA384/512 2012-01-18 10:36:28 -05:00
test_cases.txt
test_gen.awk