Martin Möhrmann
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b9a59d9f2e
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cmd/compile: optimize len([]rune(string))
Adds a new runtime function to count runes in a string.
Modifies the compiler to detect the pattern len([]rune(string))
and replaces it with the new rune counting runtime function.
RuneCount/lenruneslice/ASCII 27.8ns ± 2% 14.5ns ± 3% -47.70% (p=0.000 n=10+10)
RuneCount/lenruneslice/Japanese 126ns ± 2% 60ns ± 2% -52.03% (p=0.000 n=10+10)
RuneCount/lenruneslice/MixedLength 104ns ± 2% 50ns ± 1% -51.71% (p=0.000 n=10+9)
Fixes #24923
Change-Id: Ie9c7e7391a4e2cca675c5cdcc1e5ce7d523948b9
Reviewed-on: https://go-review.googlesource.com/108985
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
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2018-05-06 05:31:01 +00:00 |
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