8eca08611a
Re-writing the switch statement as a single boolean expression reduces the number of branches that the compiler generates. It is also arguably easier to read as a pair of numeric ranges that valid runes can exist in. No test changes since the existing test does a good job of testing all of the boundaries. This change was to gain back some performance after a correctness fix done in http://golang.org/cl/32123. The correctness fix (CL/32123) slowed down the benchmarks slightly: benchmark old ns/op new ns/op delta BenchmarkIndexRune/10-4 19.3 21.6 +11.92% BenchmarkIndexRune/32-4 33.6 35.2 +4.76% Since the fix relies on utf8.ValidRune, this CL improves benchmarks: benchmark old ns/op new ns/op delta BenchmarkIndexRune/10-4 21.6 20.0 -7.41% BenchmarkIndexRune/32-4 35.2 33.5 -4.83% Change-Id: Ib1ca10a2e29c90e879a8ef9b7221c33e85d015d8 Reviewed-on: https://go-review.googlesource.com/32122 Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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The Go Programming Language
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