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serkan-ozal's 5th submission: #648

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merged 1 commit into from
Jan 29, 2024
Merged

serkan-ozal's 5th submission: #648

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10 changes: 6 additions & 4 deletions src/main/java/dev/morling/onebrc/CalculateAverage_serkan_ozal.java
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Original file line number Diff line number Diff line change
Expand Up @@ -59,8 +59,9 @@ public class CalculateAverage_serkan_ozal {
? ByteVector.SPECIES_128
: ByteVector.SPECIES_64;
private static final int BYTE_SPECIES_SIZE = BYTE_SPECIES.vectorByteSize();

private static final MemorySegment ALL = MemorySegment.NULL.reinterpret(Long.MAX_VALUE);
private static final ByteOrder NATIVE_BYTE_ORDER = ByteOrder.nativeOrder();

private static final char NEW_LINE_SEPARATOR = '\n';
private static final char KEY_VALUE_SEPARATOR = ';';
private static final int MAX_LINE_LENGTH = 128;
Expand Down Expand Up @@ -341,7 +342,7 @@ private void doProcessRegion(MemorySegment region, long regionAddress, long regi

// Read and process region - main
for (regionPtr = regionStart; regionPtr < regionMainLimit;) {
regionPtr = doProcessLine(region, regionAddress, regionPtr, vectorSize);
regionPtr = doProcessLine(regionPtr, vectorSize);
}

// Read and process region - tail
Expand All @@ -358,13 +359,14 @@ private void doProcessRegion(MemorySegment region, long regionAddress, long regi
}
}

private long doProcessLine(MemorySegment region, long regionAddress, long regionPtr, int vectorSize) {
private long doProcessLine(long regionPtr, int vectorSize) {
// Find key/value separator
////////////////////////////////////////////////////////////////////////////////////////////////////////
long keyStartPtr = regionPtr;

// Vectorized search for key/value separator
ByteVector keyVector = ByteVector.fromMemorySegment(BYTE_SPECIES, region, regionPtr - regionAddress, NATIVE_BYTE_ORDER);
ByteVector keyVector = ByteVector.fromMemorySegment(BYTE_SPECIES, ALL, regionPtr, NATIVE_BYTE_ORDER);

int keyLength = keyVector.compare(VectorOperators.EQ, KEY_VALUE_SEPARATOR).firstTrue();
// Check whether key/value separator is found in the first vector (city name is <= vector size)
if (keyLength != vectorSize) {
Expand Down
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