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Backport hash improvements from Scala 2.13.16's MurmurHash3 #4719

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Merged
merged 1 commit into from
Mar 6, 2025
Merged

Backport hash improvements from Scala 2.13.16's MurmurHash3 #4719

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4 changes: 2 additions & 2 deletions kernel/src/main/scala-2.13+/cats/kernel/compat/HashCompat.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,7 @@ private[kernel] class HashCompat {
rangeDiff = hash - prev
rangeState = 2
case 2 =>
if (rangeDiff != hash - prev) rangeState = 3
if (rangeDiff != hash - prev || rangeDiff == 0) rangeState = 3
case _ =>
}
prev = hash
Expand Down Expand Up @@ -120,7 +120,7 @@ private[kernel] class HashCompat {
while (it.hasNext) {
h = mix(h, prev)
val hash = A.hash(it.next())
if (rangeDiff != hash - prev) {
if (rangeDiff != hash - prev || rangeDiff == 0) {
h = mix(h, hash)
i += 1
while (it.hasNext) {
Expand Down