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// Copyright ©2017 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package testblas
import (
"fmt"
"testing"
"golang.org/x/exp/rand"
)
type Zswaper interface {
Zswap(n int, x []complex128, incX int, y []complex128, incY int)
}
func ZswapTest(t *testing.T, impl Zswaper) {
rnd := rand.New(rand.NewSource(1))
for n := 0; n < 20; n++ {
for _, inc := range allPairs([]int{-5, -1, 1, 2, 5, 10}, []int{-3, -1, 1, 3, 7, 12}) {
incX := inc[0]
incY := inc[1]
aincX := abs(incX)
aincY := abs(incY)
var x, y []complex128
if n > 0 {
x = make([]complex128, (n-1)*aincX+1)
y = make([]complex128, (n-1)*aincY+1)
}
for i := range x {
x[i] = znan
}
for i := range y {
y[i] = znan
}
for i := 0; i < n; i++ {
x[i*aincX] = complex(rnd.NormFloat64(), rnd.NormFloat64())
y[i*aincY] = complex(rnd.NormFloat64(), rnd.NormFloat64())
}
xWant := make([]complex128, len(x))
for i := range xWant {
xWant[i] = znan
}
yWant := make([]complex128, len(y))
for i := range yWant {
yWant[i] = znan
}
if incX*incY > 0 {
for i := 0; i < n; i++ {
xWant[i*aincX] = y[i*aincY]
yWant[i*aincY] = x[i*aincX]
}
} else {
for i := 0; i < n; i++ {
xWant[(n-i-1)*aincX] = y[i*aincY]
yWant[(n-i-1)*aincY] = x[i*aincX]
}
}
impl.Zswap(n, x, incX, y, incY)
prefix := fmt.Sprintf("Case n=%v,incX=%v,incY=%v:", n, incX, incY)
if !zsame(x, xWant) {
t.Errorf("%v: unexpected x:\nwant %v\ngot %v", prefix, xWant, x)
}
if !zsame(y, yWant) {
t.Errorf("%v: unexpected y:\nwant %v\ngot %v", prefix, yWant, y)
}
}
}
}
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