mirror of
https://github.com/golang/go
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fb7178e7cc
This copies the change from CL 16158 (applied as
22d4c8bf13).
Updates #13013
Change-Id: Id7d02e63d92806f06a4e064a91b2fb6574fe385f
Reviewed-on: https://go-review.googlesource.com/16291
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// A copy of Sqrt tests from the math package to test the
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// purely integer arithmetic implementation in sqrt.go.
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package runtime_test
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import (
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"math"
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"runtime"
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"testing"
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)
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func SqrtRT(x float64) float64 {
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return math.Float64frombits(runtime.Sqrt(math.Float64bits(x)))
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}
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func TestSqrt(t *testing.T) {
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for i := 0; i < len(vf); i++ {
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a := math.Abs(vf[i])
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if f := SqrtRT(a); sqrt[i] != f {
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t.Errorf("Sqrt(%g) = %g, want %g", a, f, sqrt[i])
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}
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}
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for i := 0; i < len(vfsqrtSC); i++ {
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if f := SqrtRT(vfsqrtSC[i]); !alike(sqrtSC[i], f) {
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t.Errorf("Sqrt(%g) = %g, want %g", vfsqrtSC[i], f, sqrtSC[i])
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}
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}
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}
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func alike(a, b float64) bool {
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switch {
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case math.IsNaN(a) && math.IsNaN(b):
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return true
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case a == b:
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return math.Signbit(a) == math.Signbit(b)
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}
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return false
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}
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var vf = []float64{
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4.9790119248836735e+00,
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7.7388724745781045e+00,
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-2.7688005719200159e-01,
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-5.0106036182710749e+00,
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9.6362937071984173e+00,
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2.9263772392439646e+00,
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5.2290834314593066e+00,
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2.7279399104360102e+00,
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1.8253080916808550e+00,
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-8.6859247685756013e+00,
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}
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var sqrt = []float64{
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2.2313699659365484748756904e+00,
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2.7818829009464263511285458e+00,
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5.2619393496314796848143251e-01,
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2.2384377628763938724244104e+00,
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3.1042380236055381099288487e+00,
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1.7106657298385224403917771e+00,
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2.286718922705479046148059e+00,
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1.6516476350711159636222979e+00,
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1.3510396336454586262419247e+00,
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2.9471892997524949215723329e+00,
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}
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var vfsqrtSC = []float64{
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math.Inf(-1),
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-math.Pi,
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math.Copysign(0, -1),
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0,
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math.Inf(1),
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math.NaN(),
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math.Float64frombits(2),
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}
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var sqrtSC = []float64{
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math.NaN(),
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math.NaN(),
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math.Copysign(0, -1),
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0,
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math.Inf(1),
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math.NaN(),
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3.1434555694052576e-162,
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}
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