unicode/utf8: make DecodeRune{,InString} inlineable
This change makes the fast path for ASCII characters inlineable in
DecodeRune and DecodeRuneInString and removes most instances of manual
inlining at call sites.
Here are some benchmark results (no change to allocations):
goos: darwin
goarch: amd64
pkg: unicode/utf8
cpu: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz
│ old │ new │
│ sec/op │ sec/op vs base │
DecodeASCIIRune-8 2.4545n ± 2% 0.6253n ± 2% -74.52% (p=0.000 n=20)
DecodeJapaneseRune-8 3.988n ± 1% 4.023n ± 1% +0.86% (p=0.050 n=20)
DecodeASCIIRuneInString-8 2.4675n ± 1% 0.6264n ± 2% -74.61% (p=0.000 n=20)
DecodeJapaneseRuneInString-8 3.992n ± 1% 4.001n ± 1% ~ (p=0.625 n=20)
geomean 3.134n 1.585n -49.43%
Note: when #61502 gets resolved, DecodeRune and DecodeRuneInString should
be reverted to their idiomatic implementations.
Fixes #31666
Updates #48195
Change-Id: I4be25c4f52417dc28b3a7bd72f1b04018470f39d
GitHub-Last-Rev:
2e352a0045027e059be79cdb60241b5cf35fec71
GitHub-Pull-Request: golang/go#75181
Reviewed-on: https://go-review.googlesource.com/c/go/+/699675
Reviewed-by: Sean Liao <sean@liao.dev>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>