1 // Copyright ©2017 The Gonum Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
12 func same(x, y complex64) bool {
13 return x == y || (cmplx.IsNaN(complex128(x)) && cmplx.IsNaN(complex128(y)))
16 func guardVector(vec []complex64, gdVal complex64, gdLen int) (guarded []complex64) {
17 guarded = make([]complex64, len(vec)+gdLen*2)
18 copy(guarded[gdLen:], vec)
19 for i := 0; i < gdLen; i++ {
21 guarded[len(guarded)-1-i] = gdVal
26 func isValidGuard(vec []complex64, gdVal complex64, gdLen int) bool {
27 for i := 0; i < gdLen; i++ {
28 if !same(vec[i], gdVal) || !same(vec[len(vec)-1-i], gdVal) {
35 func guardIncVector(vec []complex64, gdVal complex64, inc, gdLen int) (guarded []complex64) {
39 inrLen := len(vec) * inc
40 guarded = make([]complex64, inrLen+gdLen*2)
41 for i := range guarded {
44 for i, v := range vec {
45 guarded[gdLen+i*inc] = v
50 func checkValidIncGuard(t *testing.T, vec []complex64, gdVal complex64, inc, gdLen int) {
51 srcLen := len(vec) - 2*gdLen
53 srcLen = len(vec) * -inc
58 case same(vec[i], gdVal):
60 case (i-gdLen)%inc == 0 && (i-gdLen)/inc < len(vec):
61 // Ignore input values
63 t.Errorf("Front guard violated at %d %v", i, vec[:gdLen])
64 case i > gdLen+srcLen:
65 t.Errorf("Back guard violated at %d %v", i-gdLen-srcLen, vec[gdLen+srcLen:])
67 t.Errorf("Internal guard violated at %d %v", i-gdLen, vec[gdLen:gdLen+srcLen])
72 var ( // Offset sets for testing alignment handling in Unitary assembly functions.
74 align2 = newIncSet(0, 1)
75 align3 = newIncToSet(0, 1)
82 // genInc will generate all (x,y) combinations of the input increment set.
83 func newIncSet(inc ...int) []incSet {
85 is := make([]incSet, n*n)
88 is[x*n+y] = incSet{inc[x], inc[y]}
94 type incToSet struct {
98 // genIncTo will generate all (dst,x,y) combinations of the input increment set.
99 func newIncToSet(inc ...int) []incToSet {
101 is := make([]incToSet, n*n*n)
102 for i, dst := range inc {
105 is[i*n*n+x*n+y] = incToSet{dst, inc[x], inc[y]}