| commit | b71ed4edc6a5663caac434f9c2bea47dbc37db15 | [log] [tgz] |
|---|---|---|
| author | Martin Möhrmann <moehrmann@google.com> | Sat Mar 11 08:48:56 2017 +0100 |
| committer | Robert Griesemer <gri@golang.org> | Sun Mar 12 21:37:32 2017 +0000 |
| tree | 0714fabf7b55cf3930178178e62887b5cbc12f50 | |
| parent | d343478295f8635e60014fa9481ccea04b6c53a8 [diff] |
strconv: fix performance regression in integer formatting on 32bit platforms Some of the changes in CL golang.org/cl/38071/ assumed that / and % could always be combined to use only one DIV instruction. However, this is not the case for 64bit operands on a 32bit platform which use seperate runtime functions to calculate division and modulo. This CL restores the original optimizations that help on 32bit platforms with negligible impact on 64bit platforms. 386: name old time/op new time/op delta FormatInt-2 6.06µs ± 0% 6.02µs ± 0% -0.70% (p=0.000 n=20+20) AppendInt-2 4.98µs ± 0% 4.98µs ± 0% ~ (p=0.747 n=18+18) FormatUint-2 1.93µs ± 0% 1.85µs ± 0% -4.19% (p=0.000 n=20+20) AppendUint-2 1.71µs ± 0% 1.64µs ± 0% -3.68% (p=0.000 n=20+20) amd64: name old time/op new time/op delta FormatInt-2 2.41µs ± 0% 2.41µs ± 0% -0.09% (p=0.010 n=18+18) AppendInt-2 1.77µs ± 0% 1.77µs ± 0% +0.08% (p=0.000 n=18+18) FormatUint-2 653ns ± 1% 653ns ± 0% ~ (p=0.178 n=20+20) AppendUint-2 514ns ± 0% 513ns ± 0% -0.13% (p=0.000 n=20+17) Change-Id: I574a18e54fb41b25fbe51ce696e7a8765abc79a6 Reviewed-on: https://go-review.googlesource.com/38051 Run-TryBot: Martin Möhrmann <moehrmann@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
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