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// +build !sse
// +build !avx
package vecf64
/*
IMPORTANT NOTE:
Currently Div does not handle division by zero correctly. It returns a NaN instead of +Inf
*/
import (
"math"
"testing"
"unsafe"
"github.com/stretchr/testify/assert"
)
func TestDiv(t *testing.T) {
assert := assert.New(t)
a := Range(0, niceprime-1)
correct := Range(0, niceprime-1)
for i := range correct {
correct[i] = 1
}
Div(a, a)
assert.Equal(correct[1:], a[1:])
assert.Equal(true, math.IsInf(a[0], 0), "a[0] is: %v", a[0])
b := Range(niceprime, 2*niceprime-1)
for i := range correct {
correct[i] = a[i] / b[i]
}
Div(a, b)
assert.Equal(correct[1:], a[1:])
assert.Equal(true, math.IsInf(a[0], 0), "a[0] is: %v", a[0])
/* Weird Corner Cases*/
for i := 1; i < 65; i++ {
a = Range(0, i)
var testAlign bool
addr := &a[0]
u := uint(uintptr(unsafe.Pointer(addr)))
if u&uint(32) != 0 {
testAlign = true
}
if testAlign {
b = Range(i, 2*i)
correct = make([]float64, i)
for j := range correct {
correct[j] = a[j] / b[j]
}
Div(a, b)
assert.Equal(correct[1:], a[1:])
}
}
}
func TestSqrt(t *testing.T) {
assert := assert.New(t)
a := Range(0, niceprime-1)
correct := Range(0, niceprime-1)
for i, v := range correct {
correct[i] = math.Sqrt(v)
}
Sqrt(a)
assert.Equal(correct, a)
// negatives
a = []float64{-1, -2, -3, -4}
Sqrt(a)
for _, v := range a {
if !math.IsNaN(v) {
t.Error("Expected NaN")
}
}
/* Weird Corner Cases*/
for i := 1; i < 65; i++ {
a = Range(0, i)
var testAlign bool
addr := &a[0]
u := uint(uintptr(unsafe.Pointer(addr)))
if u&uint(32) != 0 {
testAlign = true
}
if testAlign {
correct = make([]float64, i)
for j := range correct {
correct[j] = math.Sqrt(a[j])
}
Sqrt(a)
assert.Equal(correct, a)
}
}
}
func TestInvSqrt(t *testing.T) {
assert := assert.New(t)
a := Range(0, niceprime-1)
correct := Range(0, niceprime-1)
for i, v := range correct {
correct[i] = 1.0 / math.Sqrt(v)
}
InvSqrt(a)
assert.Equal(correct[1:], a[1:])
if !math.IsInf(a[0], 0) {
t.Error("1/0 should be +Inf or -Inf")
}
// Weird Corner Cases
for i := 1; i < 65; i++ {
a = Range(0, i)
var testAlign bool
addr := &a[0]
u := uint(uintptr(unsafe.Pointer(addr)))
if u&uint(32) != 0 {
testAlign = true
}
if testAlign {
correct = make([]float64, i)
for j := range correct {
correct[j] = 1.0 / math.Sqrt(a[j])
}
InvSqrt(a)
assert.Equal(correct[1:], a[1:], "i = %d, %v", i, Range(0, i))
if !math.IsInf(a[0], 0) {
t.Error("1/0 should be +Inf or -Inf")
}
}
}
}
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