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Copy pathrange_test.go
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range_test.go
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package bitarray
import (
"math/rand"
"strings"
"testing"
"time"
)
func TestSwapRange(t *testing.T) {
t.Run("swap-range, same-length < 64 bits", func(t *testing.T) {
const (
sa = "100110011"
sb = "000001110"
ea = "000000011"
eb = "100111110"
)
a := FromStr(sa)
b := FromStr(sb)
SwapRange(a.Range(0, 5), b.Range(0, 5))
if a.String() != ea {
t.Fatalf("Test `a` failed. got = %s, exp = %s\n", a.String(), ea)
}
if b.String() != eb {
t.Fatalf("Test `b` failed. got = %s, exp = %s\n", b.String(), ea)
}
})
t.Run("swap-range, min-length < 64 bits", func(t *testing.T) {
const (
sa = "100110011"
sb = "000001110"
ea = "100011011"
eb = "000011010"
)
a := FromStr(sa)
b := FromStr(sb)
SwapRange(a.Range(2, 4), b.Range(3, 5))
if a.String() != ea {
t.Fatalf("Test `a` failed. got = %s, exp = %s\n", a.String(), ea)
}
if b.String() != eb {
t.Fatalf("Test `b` failed. got = %s, exp = %s\n", b.String(), ea)
}
})
t.Run("swap-range, same-length > 64 bits", func(t *testing.T) {
const (
sa = "011011101111011001101011110101101111001100010001000000011110111000101000"
sb = "110000001000110111010111010111111100011111111001001011101011000111110000"
ea = "110000001000110111010111010111111100011111111001001011101011000111110000"
eb = "011011101111011001101011110101101111001100010001000000011110111000101000"
k = 0
nb = 69
)
a := FromStr(sa)
b := FromStr(sb)
SwapRange(a.Range(k, nb), b.Range(k, nb))
if a.String() != ea {
t.Fatalf("Test `a` failed. got = %s, exp = %s\n", a.String(), ea)
}
if b.String() != eb {
t.Fatalf("Test `b` failed. got = %s, exp = %s\n", b.String(), ea)
}
})
t.Run("swap-range, aligned+unaligned, same-length > 64 bits", func(t *testing.T) {
const (
sa = "011011101111011001101011110101101111001100010001000000011110111000101000"
sb = "110000001000110111010111010111111100011111111001001011101011000111110000"
ea = "011110000001000110111010111010111111100011111111001001011101011000111110"
eb = "011101111011001101011110101101111001100010001000000011110111000101000000"
nb = 69
)
a := FromStr(sa)
b := FromStr(sb)
SwapRange(a.Range(3, nb), b.Range(0, nb))
if a.String() != ea {
t.Fatalf("Test `a` failed. got = %s, exp = %s\n", a.String(), ea)
}
if b.String() != eb {
t.Fatalf("Test `b` failed. got = %s, exp = %s\n", b.String(), ea)
}
})
t.Run("swap-range, aligned+unaligned, min-length > 64 bits", func(t *testing.T) {
const (
sa = "011011101111011001101011110101101111001100010001000000011110111000101000"
sb = "110000001000110111010111010111111100011111111001001011101011000111110000"
ea = "011011000000100011011101011101011111110001111111100100101110101100011111"
eb = "111011110110011010111101011011110011000100010000000111101110001010000000"
)
a := FromStr(sa)
b := FromStr(sb)
SwapRange(a.Range(6, 66), b.Range(2, b.n-2))
if a.String() != ea {
t.Fatalf("Test `a` failed. got = %s, exp = %s\n", a.String(), ea)
}
if b.String() != eb {
t.Fatalf("Test `b` failed. got = %s, exp = %s\n", b.String(), ea)
}
})
}
func BenchmarkSwapRange(b *testing.B) {
rng := rand.New(rand.NewSource(time.Now().UnixNano()))
b.Run("swap-range, worst-case", func(b *testing.B) {
b.ReportAllocs()
b.StopTimer()
b1 := New(512)
randomize(&b1, rng)
b2 := New(512)
randomize(&b2, rng)
b1r, b2r := b1.Range(47, 445), b2.Range(67, b2.n-67)
b.StartTimer()
for i := 0; i < b.N; i++ {
SwapRange(b1r, b2r)
}
})
b.Run("swap-range, start position same, mixed > 64 bits", func(b *testing.B) {
b.ReportAllocs()
b.StopTimer()
b1 := New(512)
b2 := New(b1.n)
randomize(&b1, rng)
randomize(&b2, rng)
b1r := b1.Range(47, 445)
b2r := b2.Range(47, 437)
b.StartTimer()
for i := 0; i < b.N; i++ {
SwapRange(b1r, b2r)
}
})
b.Run("swap-range, start position same == 0, mixed > 64 bits", func(b *testing.B) {
b.ReportAllocs()
b.StopTimer()
b1 := New(512)
b2 := New(b1.n)
randomize(&b1, rng)
randomize(&b2, rng)
b1r := b1.Range(0, 445)
b2r := b2.Range(0, 437)
b.StartTimer()
for i := 0; i < b.N; i++ {
SwapRange(b1r, b2r)
}
})
b.Run("swap-range, start position same == 0, aligned > 64 bits", func(b *testing.B) {
b.ReportAllocs()
b.StopTimer()
b1 := New(512)
b2 := New(b1.n)
randomize(&b1, rng)
randomize(&b2, rng)
b1r := b1.Range(0, 448)
b2r := b2.Range(0, 448)
b.StartTimer()
for i := 0; i < b.N; i++ {
SwapRange(b1r, b2r)
}
})
}
func TestCopyRange(t *testing.T) {
rng := rand.New(rand.NewSource(time.Now().UnixNano()))
t.Run("non-aligned copy < 64 bits", func(t *testing.T) {
const ss = "011100000"
const ds = "101000110"
src := FromStr(ss)
dst := FromStr(ds)
CopyRange(dst.Range(0, 5), src.Range(0, 5))
ed := ss[:5] + ds[5:]
if dst.String() != ed {
t.Fatalf("Test CopyRange failed. got = %s, exp = %s\n", dst.String(), ed)
}
})
t.Run("aligned copy, nbits % 64 == 0", func(t *testing.T) {
src := New(256)
randomize(&src, rng)
dst := New(512)
es := src.String() + strings.Repeat("0", src.n)
CopyRange(dst.Range(0, dst.n), src.Range(0, src.n))
if dst.String() != es {
t.Fatalf("Test CopyRange failed. got = %s\nexp=%s\n", dst.String(), es)
}
})
t.Run("aligned+unaligned copy, nbits > 64", func(t *testing.T) {
src := New(256)
randomize(&src, rng)
dst := New(512)
es := src.String()[:49] + strings.Repeat("0", dst.n-49)
CopyRange(dst.Range(0, dst.n), src.Range(0, 49))
if dst.String() != es {
t.Fatalf("Test CopyRange failed. got = %s\nexp=%s\n", dst.String(), es)
}
})
t.Run("unaligned copy, nbits > 64", func(t *testing.T) {
const db, dn = 49, 128 // no. of bits from dst
const sb, sn = 23, 230 // no. of bits from src
src := New(256)
randomize(&src, rng)
dst := New(256)
randomize(&dst, rng)
// 49 + 128 + 79
es := dst.String()[:db] + src.String()[sb:sb+dn] + dst.String()[db+dn:]
CopyRange(dst.Range(db, dn), src.Range(sb, sn))
if dst.String() != es {
t.Fatalf("Test CopyRange failed. got = %s\nexp=%s\n", dst.String(), es)
}
})
}
func BenchmarkCopyRange(b *testing.B) {
rng := rand.New(rand.NewSource(time.Now().UnixNano()))
b.Run("worst case - unaligned copy", func(b *testing.B) {
b.ReportAllocs()
b.StopTimer()
src := New(512)
randomize(&src, rng)
dst := New(512)
randomize(&dst, rng)
dr, sr := dst.Range(47, 445), src.Range(67, src.n-67)
b.StartTimer()
for i := 0; i < b.N; i++ {
CopyRange(dr, sr)
}
})
b.Run("best case - aligned copy", func(b *testing.B) {
b.ReportAllocs()
b.StopTimer()
src := New(512)
randomize(&src, rng)
dst := New(512)
randomize(&dst, rng)
dr, sr := dst.Range(128, 384), src.Range(64, 384)
b.StartTimer()
for i := 0; i < b.N; i++ {
CopyRange(dr, sr)
}
})
}