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Simplify dedupeStation() (#589)

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13.8s locally now.

Co-authored-by: Ian Preston <ianopolous@protonmail.com>
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Dr Ian Preston 2024-01-27 18:43:41 +00:00 committed by GitHub
parent d9604d9258
commit 8279aa7560
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1 changed files with 10 additions and 16 deletions
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10
src/main/java/dev/morling/onebrc/CalculateAverage_ianopolousfast.java
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@ -19,6 +19,7 @@ import jdk.incubator.vector.ByteVector;
import jdk.incubator.vector.VectorOperators;
import jdk.incubator.vector.VectorSpecies;
import java.io.IOException;
import java.lang.foreign.Arena;
import java.lang.foreign.MemorySegment;
import java.nio.ByteOrder;
@ -41,7 +42,7 @@ import static java.lang.foreign.ValueLayout.*;
*
* Timings on 4 core i7-7500U CPU @ 2.70GHz:
* average_baseline: 4m48s
* ianopolous: 14s
* ianopolous: 13.8s
*/
public class CalculateAverage_ianopolousfast {
@ -107,12 +108,6 @@ public class CalculateAverage_ianopolousfast {
public static Stat dedupeStation(long start, long end, long hash, MemorySegment buffer, Stat[] stations) {
int index = hashToIndex(hash, MAX_STATIONS);
Stat match = stations[index];
if (match == null) {
Stat res = createStation(start, end, buffer);
stations[index] = res;
return res;
}
else {
while (match != null) {
if (matchingStationBytes(start, end, buffer, match))
return match;
@ -123,7 +118,6 @@ public class CalculateAverage_ianopolousfast {
stations[index] = res;
return res;
}
}
static long maskHighBytes(long d, int nbytes) {
return d & (-1L << ((8 - nbytes) * 8));