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more memory-efficient implementation of line reading

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This commit is contained in:
Shivaram Lingamneni 2020-08-07 01:10:46 -04:00
parent 12bcba01cd
commit c78253fd93
6 changed files with 96 additions and 45 deletions
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14
irc/history/history.go
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@ -321,18 +321,6 @@ func (list *Buffer) next(index int) int {
}
}
// return n such that v <= n and n == 2**i for some i
func roundUpToPowerOfTwo(v int) int {
// http://graphics.stanford.edu/~seander/bithacks.html
v -= 1
v |= v >> 1
v |= v >> 2
v |= v >> 4
v |= v >> 8
v |= v >> 16
return v + 1
}
func (list *Buffer) maybeExpand() {
if list.window == 0 {
return // autoresize is disabled
@ -352,7 +340,7 @@ func (list *Buffer) maybeExpand() {
return // oldest element is old enough to overwrite
}
newSize := roundUpToPowerOfTwo(length + 1)
newSize := utils.RoundUpToPowerOfTwo(length + 1)
if list.maximumSize < newSize {
newSize = list.maximumSize
}