• fanzha02's avatar
    cmd/compile: optimize math.Float64(32)bits and math.Float64(32)frombits on arm64 · a19a83c8
    fanzha02 authored
    Use float <-> int register moves without conversion instead of stores
    and loads to move float <-> int values.
    
    Math package benchmark results.
    name                 old time/op  new time/op  delta
    Acosh                 153ns ± 0%   147ns ± 0%   -3.92%  (p=0.000 n=10+10)
    Asinh                 183ns ± 0%   177ns ± 0%   -3.28%  (p=0.000 n=10+10)
    Atanh                 157ns ± 0%   155ns ± 0%   -1.27%  (p=0.000 n=10+10)
    Atan2                 118ns ± 0%   117ns ± 1%   -0.59%  (p=0.003 n=10+10)
    Cbrt                  119ns ± 0%   114ns ± 0%   -4.20%  (p=0.000 n=10+10)
    Copysign             7.51ns ± 0%  6.51ns ± 0%  -13.32%  (p=0.000 n=9+10)
    Cos                  73.1ns ± 0%  70.6ns ± 0%   -3.42%  (p=0.000 n=10+10)
    Cosh                  119ns ± 0%   121ns ± 0%   +1.68%  (p=0.000 n=10+9)
    ExpGo                 154ns ± 0%   149ns ± 0%   -3.05%  (p=0.000 n=9+10)
    Expm1                 101ns ± 0%    99ns ± 0%   -1.88%  (p=0.000 n=10+10)
    Exp2Go                150ns ± 0%   146ns ± 0%   -2.67%  (p=0.000 n=10+10)
    Abs                  7.01ns ± 0%  6.01ns ± 0%  -14.27%  (p=0.000 n=10+9)
    Mod                   234ns ± 0%   212ns ± 0%   -9.40%  (p=0.000 n=9+10)
    Frexp                34.5ns ± 0%  30.0ns ± 0%  -13.04%  (p=0.000 n=10+10)
    Gamma                 112ns ± 0%   111ns ± 0%   -0.89%  (p=0.000 n=10+10)
    Hypot                73.6ns ± 0%  68.6ns ± 0%   -6.79%  (p=0.000 n=10+10)
    HypotGo              77.1ns ± 0%  72.1ns ± 0%   -6.49%  (p=0.000 n=10+10)
    Ilogb                31.0ns ± 0%  28.0ns ± 0%   -9.68%  (p=0.000 n=10+10)
    J0                    437ns ± 0%   434ns ± 0%   -0.62%  (p=0.000 n=10+10)
    J1                    433ns ± 0%   431ns ± 0%   -0.46%  (p=0.000 n=10+10)
    Jn                    927ns ± 0%   922ns ± 0%   -0.54%  (p=0.000 n=10+10)
    Ldexp                41.5ns ± 0%  37.0ns ± 0%  -10.84%  (p=0.000 n=9+10)
    Log                   124ns ± 0%   118ns ± 0%   -4.84%  (p=0.000 n=10+9)
    Logb                 34.0ns ± 0%  32.0ns ± 0%   -5.88%  (p=0.000 n=10+10)
    Log1p                 110ns ± 0%   108ns ± 0%   -1.82%  (p=0.000 n=10+10)
    Log10                 136ns ± 0%   132ns ± 0%   -2.94%  (p=0.000 n=10+10)
    Log2                 51.6ns ± 0%  47.1ns ± 0%   -8.72%  (p=0.000 n=10+10)
    Nextafter32          33.0ns ± 0%  30.5ns ± 0%   -7.58%  (p=0.000 n=10+10)
    Nextafter64          29.0ns ± 0%  26.5ns ± 0%   -8.62%  (p=0.000 n=10+10)
    PowInt                169ns ± 0%   160ns ± 0%   -5.33%  (p=0.000 n=10+10)
    PowFrac               375ns ± 0%   361ns ± 0%   -3.73%  (p=0.000 n=10+10)
    RoundToEven          14.0ns ± 0%  12.5ns ± 0%  -10.71%  (p=0.000 n=10+10)
    Remainder             206ns ± 0%   192ns ± 0%   -6.80%  (p=0.000 n=10+9)
    Signbit              6.01ns ± 0%  5.51ns ± 0%   -8.32%  (p=0.000 n=10+9)
    Sin                  70.1ns ± 0%  69.6ns ± 0%   -0.71%  (p=0.000 n=10+10)
    Sincos               99.1ns ± 0%  99.6ns ± 0%   +0.50%  (p=0.000 n=9+10)
    SqrtGoLatency         178ns ± 0%   146ns ± 0%  -17.70%  (p=0.000 n=8+10)
    SqrtPrime            9.19µs ± 0%  9.20µs ± 0%   +0.01%  (p=0.000 n=9+9)
    Tanh                  125ns ± 1%   127ns ± 0%   +1.36%  (p=0.000 n=10+10)
    Y0                    428ns ± 0%   426ns ± 0%   -0.47%  (p=0.000 n=10+10)
    Y1                    431ns ± 0%   429ns ± 0%   -0.46%  (p=0.000 n=10+9)
    Yn                    906ns ± 0%   901ns ± 0%   -0.55%  (p=0.000 n=10+10)
    Float64bits          4.50ns ± 0%  3.50ns ± 0%  -22.22%  (p=0.000 n=10+10)
    Float64frombits      4.00ns ± 0%  3.50ns ± 0%  -12.50%  (p=0.000 n=10+9)
    Float32bits          4.50ns ± 0%  3.50ns ± 0%  -22.22%  (p=0.002 n=8+10)
    Float32frombits      4.00ns ± 0%  3.50ns ± 0%  -12.50%  (p=0.000 n=10+10)
    
    Change-Id: Iba829e15d5624962fe0c699139ea783efeefabc2
    Reviewed-on: https://go-review.googlesource.com/129715Reviewed-by: 's avatarCherry Zhang <cherryyz@google.com>
    Run-TryBot: Cherry Zhang <cherryyz@google.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    a19a83c8
math.go 3.98 KB