goankur commented on code in PR #13572:
URL: https://github.com/apache/lucene/pull/13572#discussion_r1817415010
##########
lucene/benchmark-jmh/src/java/org/apache/lucene/benchmark/jmh/VectorUtilBenchmark.java:
##########
@@ -84,6 +91,76 @@ public void init() {
floatsA[i] = random.nextFloat();
floatsB[i] = random.nextFloat();
}
+ // Java 21+ specific initialization
+ final int runtimeVersion = Runtime.version().feature();
+ if (runtimeVersion >= 21) {
+ // Reflection based code to eliminate the use of Preview classes in JMH
benchmarks
+ try {
+ final Class<?> vectorUtilSupportClass =
VectorUtil.getVectorUtilSupportClass();
+ final var className =
"org.apache.lucene.internal.vectorization.PanamaVectorUtilSupport";
+ if (vectorUtilSupportClass.getName().equals(className) == false) {
+ nativeBytesA = null;
+ nativeBytesB = null;
+ } else {
+ MethodHandles.Lookup lookup = MethodHandles.lookup();
+ final var MemorySegment = "java.lang.foreign.MemorySegment";
+ final var methodType =
+ MethodType.methodType(lookup.findClass(MemorySegment),
byte[].class);
+ MethodHandle nativeMemorySegment =
+ lookup.findStatic(vectorUtilSupportClass, "nativeMemorySegment",
methodType);
+ byte[] a = new byte[size];
Review Comment:
Nonetheless I will simplify the setup code to make it a bit more readable in
the next iteration.
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