811b187a4f
First, use a dummy slice access on decode64 and decode32 to ensure that there is a single bounds check for src. Second, move the PutUint64/PutUint32 calls out of these functions, meaning that they are simpler and smaller. This may also open the door to inlineability in the future, but for now, they both go past the budget. While at it, get rid of the ilen and olen variables, which have no impact whatsoever on performance. At least, not measurable by any of the benchmarks. name old time/op new time/op delta DecodeString/2-4 54.3ns ± 1% 55.2ns ± 2% +1.60% (p=0.017 n=5+6) DecodeString/4-4 66.6ns ± 1% 66.8ns ± 2% ~ (p=0.903 n=6+6) DecodeString/8-4 79.3ns ± 2% 79.6ns ± 1% ~ (p=0.448 n=6+6) DecodeString/64-4 300ns ± 1% 281ns ± 3% -6.54% (p=0.002 n=6+6) DecodeString/8192-4 27.4µs ± 1% 23.7µs ± 2% -13.47% (p=0.002 n=6+6) name old speed new speed delta DecodeString/2-4 73.7MB/s ± 1% 72.5MB/s ± 2% -1.55% (p=0.026 n=5+6) DecodeString/4-4 120MB/s ± 1% 120MB/s ± 2% ~ (p=0.851 n=6+6) DecodeString/8-4 151MB/s ± 2% 151MB/s ± 1% ~ (p=0.485 n=6+6) DecodeString/64-4 292MB/s ± 1% 313MB/s ± 3% +7.03% (p=0.002 n=6+6) DecodeString/8192-4 399MB/s ± 1% 461MB/s ± 2% +15.58% (p=0.002 n=6+6) For #19636. Change-Id: I0dfbdafa2a41dc4c582f63aef94b90b8e473731c Reviewed-on: https://go-review.googlesource.com/113776 Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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