rmuir commented on code in PR #913:
URL: https://github.com/apache/lucene/pull/913#discussion_r878641687
##########
lucene/core/src/java/org/apache/lucene/util/VectorUtil.java:
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@@ -213,4 +213,21 @@ public static void add(float[] u, float[] v) {
u[i] += v[i];
}
}
+
+ public static float dotProduct(BytesRef a, int aOffset, BytesRef b, int
bOffset, int len) {
+ // fixme -- move to codec? What if later we want to access the bytes some
other way?
+ int total = 0;
+ for (int i = 0; i < len; i++) {
+ total += a.bytes[aOffset++] * b.bytes[bOffset++];
Review Comment:
i wonder if we can coerce autovectorization of this loop somehow too. it is
also worth looking into as it wouldn't require any vector api at all, maybe
just manipulating the code. it is integer math: doesn't have the restrictions
that floating point does (order of operations etc), so theoretically the
compiler could do it.
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