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| author | Robert Griesemer <gri@golang.org> | 2017-04-11 16:33:21 -0700 |
|---|---|---|
| committer | Robert Griesemer <gri@golang.org> | 2017-04-11 23:57:24 +0000 |
| commit | 9d01def5979c638a9743ee491d68e3f7b81cd840 (patch) | |
| tree | 8c7b6e80b5fe49ffa2eae25fdd896e1ce11a42f3 /src/database/sql/sql.go | |
| parent | 927f8a04cce3960f1415c4efe246eb64bdb945fa (diff) | |
| download | go-9d01def5979c638a9743ee491d68e3f7b81cd840.tar.xz | |
math/bits: support negative rotation count and remove RotateRight
For details see the discussion on the issue below.
RotateLeft functions can now be inlined because the don't panic
anymore for negative rotation counts.
name old time/op new time/op delta
RotateLeft-8 6.72ns ± 2% 1.86ns ± 0% -72.33% (p=0.016 n=5+4)
RotateLeft8-8 4.41ns ± 2% 1.67ns ± 1% -62.15% (p=0.008 n=5+5)
RotateLeft16-8 4.46ns ± 6% 1.65ns ± 0% -63.06% (p=0.008 n=5+5)
RotateLeft32-8 4.50ns ± 5% 1.67ns ± 1% -62.86% (p=0.008 n=5+5)
RotateLeft64-8 4.54ns ± 1% 1.85ns ± 1% -59.32% (p=0.008 n=5+5)
https://perf.golang.org/search?q=upload:20170411.4
(Measured on 2.3 GHz Intel Core i7 running macOS 10.12.3.)
For #18616.
Change-Id: I0828d80d54ec24f8d44954a57b3d6aeedb69c686
Reviewed-on: https://go-review.googlesource.com/40394
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Diffstat (limited to 'src/database/sql/sql.go')
0 files changed, 0 insertions, 0 deletions