rmuir commented on a change in pull request #18:
URL: https://github.com/apache/lucene/pull/18#discussion_r595068893
##########
File path: lucene/core/src/java/org/apache/lucene/util/VectorUtil.java
##########
@@ -17,16 +17,123 @@
package org.apache.lucene.util;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.util.Base64;
+
/** Utilities for computations with numeric arrays */
public final class VectorUtil {
private VectorUtil() {}
+ // org.apache.lucene.util.VectorUtilSIMD#dotProduct(float[], float[])
+ private static final String SIMD_BASE64 =
+
"yv66vgAAADwAbQoAAgADBwAEDAAFAAYBABBqYXZhL2xhbmcvT2JqZWN0AQAGPGluaXQ+AQADKClW\n"
Review comment:
start with changing it to use `byte[]` instead of `float[]`. For the
case of vector 256 this replaces 64 calls each to bytebuffer position, readInt,
bswap, etc etc with a single `readBytes()` call. And it is easiest next step as
there will be no alignment issues.
going from bytebuffer is harder.
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