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gitea/vendor/github.com/RoaringBitmap/roaring/setutil_generic.go

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