f43e012084
In many cases, it is not necessary to parse long decimal mantissas entirely to produce the correctly rounded floating-point number. It is enough to parse the short, rounded lower and upper bounds and in most cases they round to the same floating point number because uint64 can hold 19 digits. Previously this case was handled by the extFloat code path (Grisu3 algorithm). name old time/op new time/op delta Atof64Big-4 1.07µs ± 2% 0.11µs ± 2% -89.61% (p=0.000 n=10+9) Atof64RandomLongFloats-4 8.03µs ± 2% 0.14µs ± 7% -98.24% (p=0.000 n=10+10) Atof32RandomLong-4 760ns ± 1% 156ns ± 0% -79.46% (p=0.000 n=10+8) Benchmarks versus extFloat: name old time/op new time/op delta Atof64Big-4 121ns ± 3% 111ns ± 2% -7.93% (p=0.000 n=10+9) Atof64RandomLongFloats-4 144ns ± 1% 142ns ± 7% ~ (p=0.167 n=10+10) Atof32RandomLong-4 129ns ± 1% 156ns ± 0% +21.12% (p=0.000 n=10+8) Change-Id: Id734b8c11e74b49a444fda67ee72870ae9422e60 Reviewed-on: https://go-review.googlesource.com/c/go/+/264677 Trust: Emmanuel Odeke <emmanuel@orijtech.com> Trust: Russ Cox <rsc@golang.org> Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Nigel Tao <nigeltao@golang.org> |
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