mirror of https://github.com/golang/go.git
e93d5b5e05
Add a fastpath that uses 32bit loads and compares to check 8 ASCII characters per loop iteration. This avoids the overhead of comparing and branching for every byte individually. Combining two 32bit loads into an uint32 allows the same code to be used for 32bit and 64bit platforms. amd64 (Intel i7-3520M): name old time/op new time/op delta ValidTenASCIIChars 15.6ns ± 4% 8.5ns ±14% -45.27% (p=0.000 n=10+10) ValidTenJapaneseChars 50.0ns ± 2% 52.7ns ±15% ~ (p=0.469 n=10+10) ValidStringTenASCIIChars 13.5ns ± 1% 7.9ns ± 5% -41.56% (p=0.000 n=10+10) ValidStringTenJapaneseChars 46.3ns ± 2% 45.8ns ± 2% ~ (p=0.085 n=10+10) arm (Raspberry Pi 3): name old time/op new time/op delta ValidTenASCIIChars 87.5ns ± 0% 58.5ns ± 0% -33.11% (p=0.000 n=9+10) ValidTenJapaneseChars 359ns ± 0% 384ns ± 0% +6.96% (p=0.000 n=10+9) ValidStringTenASCIIChars 87.5ns ± 0% 57.5ns ± 0% -34.31% (p=0.000 n=10+10) ValidStringTenJapaneseChars 356ns ± 0% 377ns ± 0% +5.90% (p=0.000 n=10+10) Change-Id: I9da942bddb250ee1f0ef7aabb4a8cb48edd9053e Reviewed-on: https://go-review.googlesource.com/c/go/+/228823 Run-TryBot: Martin Möhrmann <moehrmann@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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| .. | ||
| utf8 | ||
| utf16 | ||
| casetables.go | ||
| digit.go | ||
| digit_test.go | ||
| example_test.go | ||
| graphic.go | ||
| graphic_test.go | ||
| letter.go | ||
| letter_test.go | ||
| script_test.go | ||
| tables.go | ||