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|
package roaring
import (
"math/rand"
"sort"
)
const (
arrayDefaultMaxSize = 4096 // containers with 4096 or fewer integers should be array containers.
arrayLazyLowerBound = 1024
maxCapacity = 1 << 16
serialCookieNoRunContainer = 12346 // only arrays and bitmaps
invalidCardinality = -1
serialCookie = 12347 // runs, arrays, and bitmaps
noOffsetThreshold = 4
// Compute wordSizeInBytes, the size of a word in bytes.
_m = ^uint64(0)
_logS = _m>>8&1 + _m>>16&1 + _m>>32&1
wordSizeInBytes = 1 << _logS
// other constants used in ctz_generic.go
wordSizeInBits = wordSizeInBytes << 3 // word size in bits
)
const maxWord = 1<<wordSizeInBits - 1
// doesn't apply to runContainers
func getSizeInBytesFromCardinality(card int) int {
if card > arrayDefaultMaxSize {
// bitmapContainer
return maxCapacity / 8
}
// arrayContainer
return 2 * card
}
func fill(arr []uint64, val uint64) {
for i := range arr {
arr[i] = val
}
}
func fillRange(arr []uint64, start, end int, val uint64) {
for i := start; i < end; i++ {
arr[i] = val
}
}
func fillArrayAND(container []uint16, bitmap1, bitmap2 []uint64) {
if len(bitmap1) != len(bitmap2) {
panic("array lengths don't match")
}
// TODO: rewrite in assembly
pos := 0
for k := range bitmap1 {
bitset := bitmap1[k] & bitmap2[k]
for bitset != 0 {
t := bitset & -bitset
container[pos] = uint16((k*64 + int(popcount(t-1))))
pos = pos + 1
bitset ^= t
}
}
}
func fillArrayANDNOT(container []uint16, bitmap1, bitmap2 []uint64) {
if len(bitmap1) != len(bitmap2) {
panic("array lengths don't match")
}
// TODO: rewrite in assembly
pos := 0
for k := range bitmap1 {
bitset := bitmap1[k] &^ bitmap2[k]
for bitset != 0 {
t := bitset & -bitset
container[pos] = uint16((k*64 + int(popcount(t-1))))
pos = pos + 1
bitset ^= t
}
}
}
func fillArrayXOR(container []uint16, bitmap1, bitmap2 []uint64) {
if len(bitmap1) != len(bitmap2) {
panic("array lengths don't match")
}
// TODO: rewrite in assembly
pos := 0
for k := 0; k < len(bitmap1); k++ {
bitset := bitmap1[k] ^ bitmap2[k]
for bitset != 0 {
t := bitset & -bitset
container[pos] = uint16((k*64 + int(popcount(t-1))))
pos = pos + 1
bitset ^= t
}
}
}
func highbits(x uint32) uint16 {
return uint16(x >> 16)
}
func lowbits(x uint32) uint16 {
return uint16(x & 0xFFFF)
}
const maxLowBit = 0xFFFF
func flipBitmapRange(bitmap []uint64, start int, end int) {
if start >= end {
return
}
firstword := start / 64
endword := (end - 1) / 64
bitmap[firstword] ^= ^(^uint64(0) << uint(start%64))
for i := firstword; i < endword; i++ {
//p("flipBitmapRange on i=%v", i)
bitmap[i] = ^bitmap[i]
}
bitmap[endword] ^= ^uint64(0) >> (uint(-end) % 64)
}
func resetBitmapRange(bitmap []uint64, start int, end int) {
if start >= end {
return
}
firstword := start / 64
endword := (end - 1) / 64
if firstword == endword {
bitmap[firstword] &= ^((^uint64(0) << uint(start%64)) & (^uint64(0) >> (uint(-end) % 64)))
return
}
bitmap[firstword] &= ^(^uint64(0) << uint(start%64))
for i := firstword + 1; i < endword; i++ {
bitmap[i] = 0
}
bitmap[endword] &= ^(^uint64(0) >> (uint(-end) % 64))
}
func setBitmapRange(bitmap []uint64, start int, end int) {
if start >= end {
return
}
firstword := start / 64
endword := (end - 1) / 64
if firstword == endword {
bitmap[firstword] |= (^uint64(0) << uint(start%64)) & (^uint64(0) >> (uint(-end) % 64))
return
}
bitmap[firstword] |= ^uint64(0) << uint(start%64)
for i := firstword + 1; i < endword; i++ {
bitmap[i] = ^uint64(0)
}
bitmap[endword] |= ^uint64(0) >> (uint(-end) % 64)
}
func flipBitmapRangeAndCardinalityChange(bitmap []uint64, start int, end int) int {
before := wordCardinalityForBitmapRange(bitmap, start, end)
flipBitmapRange(bitmap, start, end)
after := wordCardinalityForBitmapRange(bitmap, start, end)
return int(after - before)
}
func resetBitmapRangeAndCardinalityChange(bitmap []uint64, start int, end int) int {
before := wordCardinalityForBitmapRange(bitmap, start, end)
resetBitmapRange(bitmap, start, end)
after := wordCardinalityForBitmapRange(bitmap, start, end)
return int(after - before)
}
func setBitmapRangeAndCardinalityChange(bitmap []uint64, start int, end int) int {
before := wordCardinalityForBitmapRange(bitmap, start, end)
setBitmapRange(bitmap, start, end)
after := wordCardinalityForBitmapRange(bitmap, start, end)
return int(after - before)
}
func wordCardinalityForBitmapRange(bitmap []uint64, start int, end int) uint64 {
answer := uint64(0)
if start >= end {
return answer
}
firstword := start / 64
endword := (end - 1) / 64
for i := firstword; i <= endword; i++ {
answer += popcount(bitmap[i])
}
return answer
}
func selectBitPosition(w uint64, j int) int {
seen := 0
// Divide 64bit
part := w & 0xFFFFFFFF
n := popcount(part)
if n <= uint64(j) {
part = w >> 32
seen += 32
j -= int(n)
}
w = part
// Divide 32bit
part = w & 0xFFFF
n = popcount(part)
if n <= uint64(j) {
part = w >> 16
seen += 16
j -= int(n)
}
w = part
// Divide 16bit
part = w & 0xFF
n = popcount(part)
if n <= uint64(j) {
part = w >> 8
seen += 8
j -= int(n)
}
w = part
// Lookup in final byte
var counter uint
for counter = 0; counter < 8; counter++ {
j -= int((w >> counter) & 1)
if j < 0 {
break
}
}
return seen + int(counter)
}
func panicOn(err error) {
if err != nil {
panic(err)
}
}
type ph struct {
orig int
rand int
}
type pha []ph
func (p pha) Len() int { return len(p) }
func (p pha) Less(i, j int) bool { return p[i].rand < p[j].rand }
func (p pha) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
func getRandomPermutation(n int) []int {
r := make([]ph, n)
for i := 0; i < n; i++ {
r[i].orig = i
r[i].rand = rand.Intn(1 << 29)
}
sort.Sort(pha(r))
m := make([]int, n)
for i := range m {
m[i] = r[i].orig
}
return m
}
func minOfInt(a, b int) int {
if a < b {
return a
}
return b
}
func maxOfInt(a, b int) int {
if a > b {
return a
}
return b
}
func maxOfUint16(a, b uint16) uint16 {
if a > b {
return a
}
return b
}
func minOfUint16(a, b uint16) uint16 {
if a < b {
return a
}
return b
}
func maxInt(a, b int) int {
if a > b {
return a
}
return b
}
func maxUint16(a, b uint16) uint16 {
if a > b {
return a
}
return b
}
func minUint16(a, b uint16) uint16 {
if a < b {
return a
}
return b
}
|
