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fmt: add ascii fast path for decoding verbs

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name                    old time/op  new time/op  delta
SprintfSlowParsingPath   108ns ± 4%   103ns ± 4%  -4.53%  (p=0.000 n=18+18)

Change-Id: I174463f303d1857e8d5b8a6283c025b3546e7b39
Reviewed-on: https://go-review.googlesource.com/44450
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Martin Möhrmann 2017-03-10 20:55:51 +01:00
parent 6661cf6dfd
commit 629b5e7561
2 changed files with 13 additions and 2 deletions
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8
src/fmt/fmt_test.go
View File

@ -1201,6 +1201,14 @@ func BenchmarkSprintfTruncateString(b *testing.B) {
})
}
func BenchmarkSprintfSlowParsingPath(b *testing.B) {
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
Sprintf("%.v", nil)
}
})
}
func BenchmarkSprintfQuoteString(b *testing.B) {
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {

7
src/fmt/print.go
View File

@ -1067,8 +1067,11 @@ formatLoop:
break
}
verb, w := utf8.DecodeRuneInString(format[i:])
i += w
verb, size := rune(format[i]), 1
if verb >= utf8.RuneSelf {
verb, size = utf8.DecodeRuneInString(format[i:])
}
i += size
switch {
case verb == '%': // Percent does not absorb operands and ignores f.wid and f.prec.