调优exmath.Round算法

[thinkeridea]

调优 exmath.Round 算法，获得接近 16% 的性能提升

$ benchstat old.txt new.txt

name old time/op new time/op delta
Round-8 4.20ns ± 3% 3.50ns ± 4% -16.69% (p=0.000 n=44+49)

$ benchcmp old.txt new.txt

benchcmp is deprecated in favor of benchstat: https://pkg.go.dev/golang.org/x/perf/cmd/benchstat
benchmark old ns/op new ns/op delta
BenchmarkRound-8 5.50 3.55 -35.45%
BenchmarkRound-8 4.50 3.49 -22.44%
BenchmarkRound-8 4.45 3.47 -22.02%
BenchmarkRound-8 4.35 3.57 -17.93%
BenchmarkRound-8 4.56 3.45 -24.34%
BenchmarkRound-8 4.84 3.47 -28.31%
BenchmarkRound-8 4.19 3.46 -17.42%
BenchmarkRound-8 4.16 3.47 -16.59%
BenchmarkRound-8 4.16 3.48 -16.35%
BenchmarkRound-8 4.17 3.48 -16.55%
BenchmarkRound-8 4.16 3.46 -16.83%
BenchmarkRound-8 4.18 3.48 -16.75%
BenchmarkRound-8 4.19 3.48 -16.95%
BenchmarkRound-8 4.23 3.47 -17.97%
BenchmarkRound-8 4.18 3.56 -14.83%
BenchmarkRound-8 4.23 3.71 -12.29%
BenchmarkRound-8 4.14 3.60 -13.04%
BenchmarkRound-8 4.18 3.62 -13.40%
BenchmarkRound-8 4.19 3.58 -14.56%
BenchmarkRound-8 4.30 3.59 -16.51%
BenchmarkRound-8 4.27 3.53 -17.33%
BenchmarkRound-8 4.25 3.47 -18.35%
BenchmarkRound-8 4.29 3.46 -19.35%
BenchmarkRound-8 4.24 3.47 -18.16%
BenchmarkRound-8 4.23 3.57 -15.60%
BenchmarkRound-8 4.16 3.47 -16.59%
BenchmarkRound-8 4.23 3.56 -15.84%
BenchmarkRound-8 4.24 3.58 -15.57%
BenchmarkRound-8 4.19 3.48 -16.95%
BenchmarkRound-8 4.22 3.46 -18.01%
BenchmarkRound-8 4.19 3.48 -16.95%
BenchmarkRound-8 4.23 3.46 -18.20%
BenchmarkRound-8 4.17 3.47 -16.79%
BenchmarkRound-8 4.25 3.63 -14.59%
BenchmarkRound-8 4.17 3.47 -16.79%
BenchmarkRound-8 4.14 3.46 -16.43%
BenchmarkRound-8 4.21 3.46 -17.81%
BenchmarkRound-8 4.15 3.47 -16.39%
BenchmarkRound-8 4.23 3.44 -18.68%
BenchmarkRound-8 4.18 3.48 -16.75%
BenchmarkRound-8 4.17 3.46 -17.03%
BenchmarkRound-8 4.20 3.47 -17.38%
BenchmarkRound-8 4.33 3.47 -19.86%
BenchmarkRound-8 4.19 3.47 -17.18%
BenchmarkRound-8 4.17 3.48 -16.55%
BenchmarkRound-8 4.18 3.52 -15.79%
BenchmarkRound-8 4.17 3.49 -16.31%
BenchmarkRound-8 4.19 3.47 -17.18%
BenchmarkRound-8 4.17 3.47 -16.79%
BenchmarkRound-8 4.16 3.57 -14.18%

[codecov]

Codecov Report

Merging #13 (d9408dd) into main (dd12918) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage   90.55%   90.55%           
=======================================
  Files          24       24           
  Lines         773      773           
=======================================
  Hits          700      700           
  Misses         51       51           
  Partials       22       22           

Impacted Files	Coverage Δ
exmath/round.go	100.00% <100.00%> (ø)

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