• Martin Möhrmann's avatar
    runtime: make complex division c99 compatible · 16200c73
    Martin Möhrmann authored
    - changes tests to check that the real and imaginary part of the go complex
      division result is equal to the result gcc produces for c99
    - changes complex division code to satisfy new complex division test
    - adds float functions isNan, isFinite, isInf, abs and copysign
      in the runtime package
    
    Fixes #14644.
    
    name                   old time/op  new time/op  delta
    Complex128DivNormal-4  21.8ns ± 6%  13.9ns ± 6%  -36.37%  (p=0.000 n=20+20)
    Complex128DivNisNaN-4  14.1ns ± 1%  15.0ns ± 1%   +5.86%  (p=0.000 n=20+19)
    Complex128DivDisNaN-4  12.5ns ± 1%  16.7ns ± 1%  +33.79%  (p=0.000 n=19+20)
    Complex128DivNisInf-4  10.1ns ± 1%  13.0ns ± 1%  +28.25%  (p=0.000 n=20+19)
    Complex128DivDisInf-4  11.0ns ± 1%  20.9ns ± 1%  +90.69%  (p=0.000 n=16+19)
    ComplexAlgMap-4        86.7ns ± 1%  86.8ns ± 2%     ~     (p=0.804 n=20+20)
    
    Change-Id: I261f3b4a81f6cc858bc7ff48f6fd1b39c300abf0
    Reviewed-on: https://go-review.googlesource.com/37441Reviewed-by: 's avatarRobert Griesemer <gri@golang.org>
    16200c73
cmplxdivide1.go 241 KB