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