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Rob Pike authored
The check for Stringer etc. can only fire if the test is not a builtin, so avoid the expensive check if we know there's no chance. Also put in a fast path for pad, which saves a more modest amount. benchmark old ns/op new ns/op delta BenchmarkSprintfEmpty 148 152 +2.70% BenchmarkSprintfString 585 497 -15.04% BenchmarkSprintfInt 441 396 -10.20% BenchmarkSprintfIntInt 718 603 -16.02% BenchmarkSprintfPrefixedInt 676 621 -8.14% BenchmarkSprintfFloat 1003 953 -4.99% BenchmarkManyArgs 2945 2312 -21.49% BenchmarkScanInts 1704152 1734441 +1.78% BenchmarkScanRecursiveInt 1837397 1828920 -0.46% R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/6245068
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