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runtime: tune appendCrossover for arm

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Turns out the optimal value is 8 on cortex-A9 systems (pandaboard)

benchmark                     old ns/op    new ns/op    delta
BenchmarkAppend                     907          908   +0.11%
BenchmarkAppend1Byte                101          101   +0.00%
BenchmarkAppend4Bytes               116          116   +0.00%
BenchmarkAppend8Bytes               139          138   -0.72%
BenchmarkAppend16Bytes              185          158  -14.59%
BenchmarkAppend32Bytes              131          131   +0.00%
BenchmarkAppendStr1Byte              72           72   +0.00%
BenchmarkAppendStr4Bytes             93           93   -0.21%
BenchmarkAppendStr8Bytes            116          116   +0.00%
BenchmarkAppendStr16Bytes           161          125  -22.36%
BenchmarkAppendStr32Bytes           102          102   +0.00%
BenchmarkAppendSpecialCase          613          613   +0.00%

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/8863045
This commit is contained in:
Dave Cheney 2013-04-28 00:18:11 +10:00
parent 3cef6979ee
commit d09f34cc55
1 changed files with 1 additions and 1 deletions
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2
src/pkg/runtime/arch_arm.h
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@ -6,5 +6,5 @@ enum {
thechar = '5',
BigEndian = 0,
CacheLineSize = 32,
appendCrossover = 16
appendCrossover = 8
};