rmuir commented on code in PR #13651:
URL: https://github.com/apache/lucene/pull/13651#discussion_r1731175737
##########
lucene/core/src/java21/org/apache/lucene/internal/vectorization/PanamaVectorUtilSupport.java:
##########
@@ -761,4 +763,81 @@ private static int squareDistanceBody128(MemorySegment a,
MemorySegment b, int l
// reduce
return acc1.add(acc2).reduceLanes(ADD);
}
+
+ @Override
+ public long ipByteBinByte(byte[] q, byte[] d) {
+ if (VECTOR_BITSIZE == 128) {
+ return ipByteBinByte128(MemorySegment.ofArray(q),
MemorySegment.ofArray(d));
+ }
+ throw new UnsupportedOperationException("Vector bit size=" +
VECTOR_BITSIZE);
+ }
+
+ static final ByteOrder LE = ByteOrder.LITTLE_ENDIAN;
+
+ public static long ipByteBinByte128(MemorySegment q, MemorySegment d) {
+ long ret = 0;
+ long subRet0 = 0;
+ long subRet1 = 0;
+ long subRet2 = 0;
+ long subRet3 = 0;
+
+ final int limit = (int) ByteVector.SPECIES_128.loopBound(d.byteSize());
+ // iterate in chunks of 256 bytes to ensure we don't overflow the
accumulator
+ // (256bytes/16lanes=16itrs)
+ final int dSize = (int) d.byteSize();
+ for (int j = 0; j < limit; j += 256) {
+ ByteVector acc0 = ByteVector.zero(ByteVector.SPECIES_128);
+ ByteVector acc1 = ByteVector.zero(ByteVector.SPECIES_128);
+ ByteVector acc2 = ByteVector.zero(ByteVector.SPECIES_128);
+ ByteVector acc3 = ByteVector.zero(ByteVector.SPECIES_128);
+ int innerLimit = Math.min(limit - j, 256);
+ for (int k = 0; k < innerLimit; k += ByteVector.SPECIES_128.length()) {
+ var vd = ByteVector.fromMemorySegment(ByteVector.SPECIES_128, d, j +
k, LE);
+ var vq0 = ByteVector.fromMemorySegment(ByteVector.SPECIES_128, q, j +
k, LE);
+ var vq1 = ByteVector.fromMemorySegment(ByteVector.SPECIES_128, q, j +
k + dSize, LE);
+ var vq2 = ByteVector.fromMemorySegment(ByteVector.SPECIES_128, q, j +
k + 2 * dSize, LE);
+ var vq3 = ByteVector.fromMemorySegment(ByteVector.SPECIES_128, q, j +
k + 3 * dSize, LE);
+ ByteVector vres0 = vq0.and(vd);
+ ByteVector vres1 = vq1.and(vd);
+ ByteVector vres2 = vq2.and(vd);
+ ByteVector vres3 = vq3.and(vd);
+ vres0 = vres0.lanewise(VectorOperators.BIT_COUNT);
+ vres1 = vres1.lanewise(VectorOperators.BIT_COUNT);
+ vres2 = vres2.lanewise(VectorOperators.BIT_COUNT);
+ vres3 = vres3.lanewise(VectorOperators.BIT_COUNT);
+ acc0 = acc0.add(vres0);
+ acc1 = acc1.add(vres1);
+ acc2 = acc2.add(vres2);
+ acc3 = acc3.add(vres3);
+ }
+ ShortVector sumShort1 = acc0.reinterpretAsShorts().and((short) 0xFF);
+ ShortVector sumShort2 =
acc0.reinterpretAsShorts().lanewise(VectorOperators.LSHR, 8);
+ subRet0 += sumShort1.add(sumShort2).reduceLanes(VectorOperators.ADD);
+
+ sumShort1 = acc1.reinterpretAsShorts().and((short) 0xFF);
+ sumShort2 = acc1.reinterpretAsShorts().lanewise(VectorOperators.LSHR, 8);
+ subRet1 += sumShort1.add(sumShort2).reduceLanes(VectorOperators.ADD);
+
+ sumShort1 = acc2.reinterpretAsShorts().and((short) 0xFF);
+ sumShort2 = acc2.reinterpretAsShorts().lanewise(VectorOperators.LSHR, 8);
+ subRet2 += sumShort1.add(sumShort2).reduceLanes(VectorOperators.ADD);
+
+ sumShort1 = acc3.reinterpretAsShorts().and((short) 0xFF);
+ sumShort2 = acc3.reinterpretAsShorts().lanewise(VectorOperators.LSHR, 8);
+ subRet3 += sumShort1.add(sumShort2).reduceLanes(VectorOperators.ADD);
Review Comment:
is there any sneaky way to prevent having to call typically-costly
`reduceLanes` 4 times?
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