0004-Add-SIMD-utilities.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Kevin Raneri <kevin.raneri@gmail.com>
Date: Tue, 8 Feb 2022 12:56:23 -0500
Subject: [PATCH] Add SIMD utilities


diff --git a/build.gradle.kts b/build.gradle.kts
index 408430ebbba5a2cec5269817e66bce9c49c39948..9d4fc7b32e4b3f232748b7f6808c33f989649f5c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -61,6 +61,14 @@ dependencies {
 }
 
 val craftbukkitPackageVersion = "1_19_R1" // Paper
+
+// Pufferfish Start
+tasks.withType<JavaCompile> {
+    val compilerArgs = options.compilerArgs
+    compilerArgs.add("--add-modules=jdk.incubator.vector")
+}
+// Pufferfish End
+
 tasks.jar {
     archiveClassifier.set("dev")
 
diff --git a/src/main/java/gg/pufferfish/pufferfish/PufferfishConfig.java b/src/main/java/gg/pufferfish/pufferfish/PufferfishConfig.java
index deb52c185705c4b4186c7bae02f2a827620c20ca..1779b2c9463a8da5d317922a9909b4d2caa39536 100644
--- a/src/main/java/gg/pufferfish/pufferfish/PufferfishConfig.java
+++ b/src/main/java/gg/pufferfish/pufferfish/PufferfishConfig.java
@@ -1,5 +1,6 @@
 package gg.pufferfish.pufferfish;
 
+import gg.pufferfish.pufferfish.simd.SIMDDetection;
 import java.io.File;
 import java.io.IOException;
 import java.lang.reflect.Method;
@@ -72,6 +73,23 @@ public class PufferfishConfig {
 		updates++;
 		
 		config.save(configFile);
+		
+		// Attempt to detect vectorization
+		try {
+			SIMDDetection.isEnabled = SIMDDetection.canEnable(PufferfishLogger.LOGGER);
+			SIMDDetection.versionLimited = SIMDDetection.getJavaVersion() != 17 && SIMDDetection.getJavaVersion() != 18;
+		} catch (NoClassDefFoundError | Exception ignored) {}
+		
+		if (SIMDDetection.isEnabled) {
+			PufferfishLogger.LOGGER.info("SIMD operations detected as functional. Will replace some operations with faster versions.");
+		} else if (SIMDDetection.versionLimited) {
+			PufferfishLogger.LOGGER.warning("Will not enable SIMD! These optimizations are only safely supported on Java 17 and Java 18.");
+		} else {
+			PufferfishLogger.LOGGER.warning("SIMD operations are available for your server, but are not configured!");
+			PufferfishLogger.LOGGER.warning("To enable additional optimizations, add \"--add-modules=jdk.incubator.vector\" to your startup flags, BEFORE the \"-jar\".");
+			PufferfishLogger.LOGGER.warning("If you have already added this flag, then SIMD operations are not supported on your JVM or CPU.");
+			PufferfishLogger.LOGGER.warning("Debug: Java: " + System.getProperty("java.version") + ", test run: " + SIMDDetection.testRun);
+		}
 	}
 	
 	private static void setComment(String key, String... comment) {