64 lines
1.1 KiB
Go
64 lines
1.1 KiB
Go
// +build !arm64 gccgo appengine
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package roaring
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func union2by2(set1 []uint16, set2 []uint16, buffer []uint16) int {
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pos := 0
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k1 := 0
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k2 := 0
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if 0 == len(set2) {
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buffer = buffer[:len(set1)]
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copy(buffer, set1[:])
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return len(set1)
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}
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if 0 == len(set1) {
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buffer = buffer[:len(set2)]
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copy(buffer, set2[:])
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return len(set2)
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}
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s1 := set1[k1]
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s2 := set2[k2]
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buffer = buffer[:cap(buffer)]
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for {
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if s1 < s2 {
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buffer[pos] = s1
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pos++
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k1++
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if k1 >= len(set1) {
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copy(buffer[pos:], set2[k2:])
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pos += len(set2) - k2
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break
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}
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s1 = set1[k1]
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} else if s1 == s2 {
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buffer[pos] = s1
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pos++
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k1++
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k2++
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if k1 >= len(set1) {
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copy(buffer[pos:], set2[k2:])
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pos += len(set2) - k2
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break
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}
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if k2 >= len(set2) {
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copy(buffer[pos:], set1[k1:])
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pos += len(set1) - k1
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break
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}
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s1 = set1[k1]
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s2 = set2[k2]
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} else { // if (set1[k1]>set2[k2])
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buffer[pos] = s2
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pos++
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k2++
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if k2 >= len(set2) {
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copy(buffer[pos:], set1[k1:])
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pos += len(set1) - k1
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break
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}
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s2 = set2[k2]
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}
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}
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return pos
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}
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