• Robert Griesemer's avatar
    big: improved computation of "karatsuba length" for faster multiplies · 407dbb42
    Robert Griesemer authored
    This results in an improvement of > 35% for the existing Mul benchmark
    using the same karatsuba threshold, and an improvement of > 50% with
    a slightly higher threshold (32 instead of 30):
    
    big.BenchmarkMul           500	   6731846 ns/op (old alg.)
    big.BenchmarkMul	   500	   4351122 ns/op (new alg.)
    big.BenchmarkMul           500	   3133782 ns/op (new alg., new theshold)
    
    Also:
    - tweaked calibrate.go, use same benchmark as for Mul benchmark
    
    R=rsc
    CC=golang-dev
    https://golang.org/cl/1037041
    407dbb42
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