+++ /dev/null
-// Copyright ©2015 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 f64
-
-import (
- "math"
- "testing"
-
- "golang.org/x/exp/rand"
-)
-
-var (
- nan = math.NaN()
- inf = math.Inf(1)
-)
-
-// newGuardedVector allocates a new slice and returns it as three subslices.
-// v is a strided vector that contains elements of data at indices i*inc and
-// NaN elsewhere. frontGuard and backGuard are filled with NaN values, and
-// their backing arrays are directly adjacent to v in memory. The three slices
-// can be used to detect invalid memory reads and writes.
-func newGuardedVector(data []float64, inc int) (v, frontGuard, backGuard []float64) {
- if inc < 0 {
- inc = -inc
- }
- guard := 2 * inc
- size := (len(data)-1)*inc + 1
- whole := make([]float64, size+2*guard)
- v = whole[guard : len(whole)-guard]
- for i := range whole {
- whole[i] = math.NaN()
- }
- for i, d := range data {
- v[i*inc] = d
- }
- return v, whole[:guard], whole[len(whole)-guard:]
-}
-
-// allNaN returns true if x contains only NaN values, and false otherwise.
-func allNaN(x []float64) bool {
- for _, v := range x {
- if !math.IsNaN(v) {
- return false
- }
- }
- return true
-}
-
-// equalStrided returns true if the strided vector x contains elements of the
-// dense vector ref at indices i*inc, false otherwise.
-func equalStrided(ref, x []float64, inc int) bool {
- if inc < 0 {
- inc = -inc
- }
- for i, v := range ref {
- if !same(x[i*inc], v) {
- return false
- }
- }
- return true
-}
-
-// nonStridedWrite returns false if all elements of x at non-stride indices are
-// equal to NaN, true otherwise.
-func nonStridedWrite(x []float64, inc int) bool {
- if inc < 0 {
- inc = -inc
- }
- for i, v := range x {
- if i%inc != 0 && !math.IsNaN(v) {
- return true
- }
- }
- return false
-}
-
-// guardVector copies the source vector (vec) into a new slice with guards.
-// Guards guarded[:gdLn] and guarded[len-gdLn:] will be filled with sigil value gdVal.
-func guardVector(vec []float64, gdVal float64, gdLn int) (guarded []float64) {
- guarded = make([]float64, len(vec)+gdLn*2)
- copy(guarded[gdLn:], vec)
- for i := 0; i < gdLn; i++ {
- guarded[i] = gdVal
- guarded[len(guarded)-1-i] = gdVal
- }
- return guarded
-}
-
-// isValidGuard will test for violated guards, generated by guardVector.
-func isValidGuard(vec []float64, gdVal float64, gdLn int) bool {
- for i := 0; i < gdLn; i++ {
- if !same(vec[i], gdVal) || !same(vec[len(vec)-1-i], gdVal) {
- return false
- }
- }
- return true
-}
-
-// guardIncVector copies the source vector (vec) into a new incremented slice with guards.
-// End guards will be length gdLen.
-// Internal and end guards will be filled with sigil value gdVal.
-func guardIncVector(vec []float64, gdVal float64, inc, gdLen int) (guarded []float64) {
- if inc < 0 {
- inc = -inc
- }
- inrLen := len(vec) * inc
- guarded = make([]float64, inrLen+gdLen*2)
- for i := range guarded {
- guarded[i] = gdVal
- }
- for i, v := range vec {
- guarded[gdLen+i*inc] = v
- }
- return guarded
-}
-
-// checkValidIncGuard will test for violated guards, generated by guardIncVector
-func checkValidIncGuard(t *testing.T, vec []float64, gdVal float64, inc, gdLen int) {
- srcLn := len(vec) - 2*gdLen
- for i := range vec {
- switch {
- case same(vec[i], gdVal):
- // Correct value
- case (i-gdLen)%inc == 0 && (i-gdLen)/inc < len(vec):
- // Ignore input values
- case i < gdLen:
- t.Errorf("Front guard violated at %d %v", i, vec[:gdLen])
- case i > gdLen+srcLn:
- t.Errorf("Back guard violated at %d %v", i-gdLen-srcLn, vec[gdLen+srcLn:])
- default:
- t.Errorf("Internal guard violated at %d %v", i-gdLen, vec[gdLen:gdLen+srcLn])
- }
- }
-}
-
-// same tests for nan-aware equality.
-func same(a, b float64) bool {
- return a == b || (math.IsNaN(a) && math.IsNaN(b))
-}
-
-var ( // Offset sets for testing alignment handling in Unitary assembly functions.
- align1 = []int{0, 1}
- align2 = newIncSet(0, 1)
- align3 = newIncToSet(0, 1)
-)
-
-type incSet struct {
- x, y int
-}
-
-// genInc will generate all (x,y) combinations of the input increment set.
-func newIncSet(inc ...int) []incSet {
- n := len(inc)
- is := make([]incSet, n*n)
- for x := range inc {
- for y := range inc {
- is[x*n+y] = incSet{inc[x], inc[y]}
- }
- }
- return is
-}
-
-type incToSet struct {
- dst, x, y int
-}
-
-// genIncTo will generate all (dst,x,y) combinations of the input increment set.
-func newIncToSet(inc ...int) []incToSet {
- n := len(inc)
- is := make([]incToSet, n*n*n)
- for i, dst := range inc {
- for x := range inc {
- for y := range inc {
- is[i*n*n+x*n+y] = incToSet{dst, inc[x], inc[y]}
- }
- }
- }
- return is
-}
-
-var benchSink []float64
-
-func randomSlice(n, inc int) []float64 {
- if inc < 0 {
- inc = -inc
- }
- x := make([]float64, (n-1)*inc+1)
- for i := range x {
- x[i] = rand.Float64()
- }
- return x
-}
-
-func randSlice(n, inc int, r *rand.Rand) []float64 {
- if inc < 0 {
- inc = -inc
- }
- x := make([]float64, (n-1)*inc+1)
- for i := range x {
- x[i] = r.Float64()
- }
- return x
-}
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