From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martijn Muijsers <martijnmuijsers@live.nl>
Date: Thu, 24 Nov 2022 01:19:12 +0100
Subject: [PATCH] SIMD support

License: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)
Gale - https://galemc.org

This patch is based on the following patch:
"Add SIMD utilities"
By: Kevin Raneri <kevin.raneri@gmail.com>
As part of: Pufferfish (https://github.com/pufferfish-gg/Pufferfish)
Licensed under: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)

diff --git a/build.gradle.kts b/build.gradle.kts
index 7d3b8f3c7616b5db72a6fccb51e5543a0e096125..394b5044090c1c7b00b30036e4b8be4a6ac58ed1 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -63,6 +63,7 @@ tasks.withType<JavaCompile> {
     compilerArgs.add("-Xlint:-module")
     compilerArgs.add("-Xlint:-removal")
     compilerArgs.add("-Xlint:-dep-ann")
+    compilerArgs.add("--add-modules=jdk.incubator.vector") // Gale - Pufferfish - SIMD support
 }
 // Gale end - hide irrelevant compilation warnings
 
@@ -186,6 +187,7 @@ fun TaskContainer.registerRunTask(
     jvmArgs("--enable-preview")
     jvmArgs("--add-opens=java.base/java.lang=ALL-UNNAMED")
     // Gale end - enable virtual threads for development runs
+    jvmArgs("--add-modules=jdk.incubator.vector") // Gale - Pufferfish - SIMD support
 
     doFirst {
         workingDir.mkdirs()
diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
index 985f1a50438b325e33fba5d07e26519171504aab..54458601bbda3a4142c09f717e3b87a079ce096f 100644
--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
+++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
@@ -14,6 +14,8 @@ import java.util.Locale;
 import java.util.Optional;
 import java.util.function.BooleanSupplier;
 import javax.annotation.Nullable;
+
+import gg.pufferfish.pufferfish.simd.SIMDDetection;
 import net.minecraft.DefaultUncaughtExceptionHandler;
 import net.minecraft.DefaultUncaughtExceptionHandlerWithName;
 import net.minecraft.SharedConstants;
@@ -46,6 +48,7 @@ import net.minecraft.world.level.GameType;
 import net.minecraft.world.level.block.entity.SkullBlockEntity;
 import net.minecraft.world.level.storage.LevelStorageSource;
 import org.galemc.gale.command.GaleCommands;
+import org.galemc.gale.configuration.GaleGlobalConfiguration;
 import org.slf4j.Logger;
 
 // CraftBukkit start
@@ -223,6 +226,20 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
         io.papermc.paper.brigadier.PaperBrigadierProviderImpl.INSTANCE.getClass(); // init PaperBrigadierProvider
         // Paper end
 
+        // Gale start - Pufferfish - SIMD support
+        // Attempt to detect vectorization
+        try {
+            SIMDDetection.isEnabled = SIMDDetection.canEnable(LOGGER, GaleGlobalConfiguration.get().smallOptimizations.simd.logVectorSizesToConsole);
+        } catch (NoClassDefFoundError | Exception ignored) {}
+
+        if (!SIMDDetection.isEnabled && !SIMDDetection.unsupportingLaneSize && GaleGlobalConfiguration.get().smallOptimizations.simd.warnIfDisabled) {
+            LOGGER.warn("SIMD operations are available for your server, but are not configured!");
+            LOGGER.warn("To enable additional optimizations, add \"--add-modules=jdk.incubator.vector\" to your startup flags, BEFORE the \"-jar\".");
+            LOGGER.warn("If you have already added this flag, then SIMD operations are not supported on your JVM or CPU.");
+            LOGGER.warn("If you would like to disable this message, set simd.warn-if-disabled to false in gale-global.yml");
+        }
+        // Gale start - Pufferfish - SIMD support
+
         this.setPvpAllowed(dedicatedserverproperties.pvp);
         this.setFlightAllowed(dedicatedserverproperties.allowFlight);
         this.setMotd(dedicatedserverproperties.motd);
diff --git a/src/main/java/org/galemc/gale/configuration/GaleGlobalConfiguration.java b/src/main/java/org/galemc/gale/configuration/GaleGlobalConfiguration.java
index 2a3cd1baab364126d10a42c8ab59f3da8ca9bdfb..5ade5d2ff3a68cf9e0240fc86e4b63432cb899c0 100644
--- a/src/main/java/org/galemc/gale/configuration/GaleGlobalConfiguration.java
+++ b/src/main/java/org/galemc/gale/configuration/GaleGlobalConfiguration.java
@@ -25,6 +25,14 @@ public class GaleGlobalConfiguration extends ConfigurationPart {
 
         public int dummyValue = 0;
 
+        // Gale start - Pufferfish - SIMD support
+        public Simd simd;
+        public class Simd extends ConfigurationPart {
+            public boolean warnIfDisabled = true;
+            public boolean logVectorSizesToConsole = false;
+        }
+        // Gale end - Pufferfish - SIMD support
+
     }
 
     public Misc misc;