| commit | bc8b9b23ca3f33e738d85c4734bd35dfe63e9ac4 | [log] [tgz] |
|---|---|---|
| author | Aliaksandr Valialkin <valyala@gmail.com> | Thu Mar 09 12:29:45 2017 +0200 |
| committer | Robert Griesemer <gri@golang.org> | Thu Mar 16 19:58:51 2017 +0000 |
| tree | bdd47abd2aca8ff396c0436ff6c90fbf28d9ba62 | |
| parent | dd9892e31b24a496865cea4db6cdca6d73142895 [diff] |
strconv: optimize formatting for small decimal ints Avoid memory allocations by returning pre-calculated strings for decimal ints in the range 0..99. Benchmark results: name old time/op new time/op delta FormatInt-4 2.45µs ± 1% 2.40µs ± 1% -1.86% (p=0.000 n=8+9) AppendInt-4 1.67µs ± 1% 1.65µs ± 0% -0.92% (p=0.000 n=10+10) FormatUint-4 676ns ± 3% 669ns ± 1% ~ (p=0.146 n=10+10) AppendUint-4 467ns ± 2% 474ns ± 0% +1.58% (p=0.000 n=10+10) FormatIntSmall-4 29.6ns ± 2% 3.3ns ± 0% -88.98% (p=0.000 n=10+9) AppendIntSmall-4 16.0ns ± 1% 8.5ns ± 0% -46.98% (p=0.000 n=10+9) name old alloc/op new alloc/op delta FormatInt-4 576B ± 0% 576B ± 0% ~ (all equal) AppendInt-4 0.00B 0.00B ~ (all equal) FormatUint-4 224B ± 0% 224B ± 0% ~ (all equal) AppendUint-4 0.00B 0.00B ~ (all equal) FormatIntSmall-4 2.00B ± 0% 0.00B -100.00% (p=0.000 n=10+10) AppendIntSmall-4 0.00B 0.00B ~ (all equal) name old allocs/op new allocs/op delta FormatInt-4 37.0 ± 0% 35.0 ± 0% -5.41% (p=0.000 n=10+10) AppendInt-4 0.00 0.00 ~ (all equal) FormatUint-4 6.00 ± 0% 6.00 ± 0% ~ (all equal) AppendUint-4 0.00 0.00 ~ (all equal) FormatIntSmall-4 1.00 ± 0% 0.00 -100.00% (p=0.000 n=10+10) AppendIntSmall-4 0.00 0.00 ~ (all equal) Fixes #19445 Change-Id: Ib1f8922f2e0b13743c847ee9e703d1dab77f705c Reviewed-on: https://go-review.googlesource.com/37963 Reviewed-by: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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