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TestNativeCode.java
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TestNativeCode.java
TestNativeCode.java 26.32 KB
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dwing 提交于 2024年11月22日 19:12 +08:00 . java: update TestNativeCode
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import java.lang.foreign.Arena;

import java.lang.foreign.FunctionDescriptor;

import java.lang.foreign.Linker;

import java.lang.foreign.MemorySegment;

import java.lang.foreign.SymbolLookup;

import java.lang.invoke.MethodHandle;

import java.lang.reflect.Method;

import java.lang.reflect.Modifier;

import java.nio.ByteBuffer;

import java.nio.ByteOrder;

import jdk.incubator.vector.FloatVector;

import jdk.incubator.vector.VectorShuffle;

import jdk.vm.ci.code.site.DataPatch;

import jdk.vm.ci.code.site.Mark;

import jdk.vm.ci.code.site.Site;

import jdk.vm.ci.hotspot.HotSpotCompiledCode;

import jdk.vm.ci.hotspot.HotSpotCompiledNmethod;

import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;

import jdk.vm.ci.meta.Assumptions;

import jdk.vm.ci.meta.ResolvedJavaMethod;

import jdk.vm.ci.runtime.JVMCI;

import jdk.vm.ci.runtime.JVMCICompiler;

import util.UnsafeUtil;

import static java.lang.foreign.ValueLayout.JAVA_FLOAT;

import static java.lang.foreign.ValueLayout.JAVA_INT;

import static java.lang.foreign.ValueLayout.JAVA_LONG;

import static java.nio.ByteOrder.nativeOrder;

import static jdk.incubator.vector.FloatVector.SPECIES_256;



// ref: https://github.com/apangin/nalim

// ref: https://github.com/JOML-CI/joml-bench

// ref: https://godbolt.org/

// ref: https://defuse.ca/online-x86-assembler.htm

// javac:

// --add-modules jdk.incubator.vector

// --add-modules jdk.internal.vm.ci

// --add-exports jdk.internal.vm.ci/jdk.vm.ci.code=ALL-UNNAMED

// --add-exports jdk.internal.vm.ci/jdk.vm.ci.code.site=ALL-UNNAMED

// --add-exports jdk.internal.vm.ci/jdk.vm.ci.hotspot=ALL-UNNAMED

// --add-exports jdk.internal.vm.ci/jdk.vm.ci.runtime=ALL-UNNAMED

// --add-exports jdk.internal.vm.ci/jdk.vm.ci.meta=ALL-UNNAMED

// java:

// --add-modules jdk.incubator.vector -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI --enable-native-access=ALL-UNNAMED

public class TestNativeCode {

	static {

		System.setProperty("jdk.incubator.vector.VECTOR_ACCESS_OOB_CHECK", "0");

		try {

			var m = UnsafeUtil.getMethod(Module.class, "implAddOpensToAllUnnamed", String.class);

			var jvmciModule = Class.forName("jdk.vm.ci.runtime.JVMCI").getModule();

			m.invoke(jvmciModule, "jdk.vm.ci.code"); // --add-opens jdk.internal.vm.ci/jdk.vm.ci.code=ALL-UNNAMED

			m.invoke(jvmciModule, "jdk.vm.ci.code.site"); // --add-opens jdk.internal.vm.ci/jdk.vm.ci.code.site=ALL-UNNAMED

			m.invoke(jvmciModule, "jdk.vm.ci.hotspot"); // --add-opens jdk.internal.vm.ci/jdk.vm.ci.hotspot=ALL-UNNAMED

			m.invoke(jvmciModule, "jdk.vm.ci.runtime"); // --add-opens jdk.internal.vm.ci/jdk.vm.ci.runtime=ALL-UNNAMED

			m.invoke(jvmciModule, "jdk.vm.ci.meta"); // --add-opens jdk.internal.vm.ci/jdk.vm.ci.meta=ALL-UNNAMED

		} catch (ReflectiveOperationException e) {

			throw new ExceptionInInitializerError(e);

		}

	}



	public static void linkCode(Method method, byte[] code) {

		assert (method.getModifiers() & (Modifier.STATIC | Modifier.NATIVE)) == (Modifier.STATIC | Modifier.NATIVE);

		var jvmci = JVMCI.getRuntime().getHostJVMCIBackend();

		var rm = jvmci.getMetaAccess().lookupJavaMethod(method);

		jvmci.getCodeCache().setDefaultCode(rm, new HotSpotCompiledNmethod(method.getName(), code, code.length,

				new Site[]{new Mark(code.length - 5, 7 /*ENTRY_BARRIER_PATCH*/)}, new Assumptions.Assumption[0],

				new ResolvedJavaMethod[0], new HotSpotCompiledCode.Comment[0], new byte[0], 1, new DataPatch[0],

				true, 0, null, (HotSpotResolvedJavaMethod)rm, JVMCICompiler.INVOCATION_ENTRY_BCI, 1, 0, false));

	}



	public static native void dummy();



	static {

		try {

			var code = new byte[]{

					0x48, (byte)0xb8, 0, 0, 0, 0, 0, 0, 0, 0, // mov rax, func_addr

					(byte)0xff, (byte)0xe0, // jmp rax

					// 4-byte align padding

					0x41, (byte)0x81, 0x7f, 0, 0 // barrier

			};

			var lib = SymbolLookup.libraryLookup("add.dll", Arena.global());

			var addr = lib.find("addNaked").orElseThrow().address();

			ByteBuffer.wrap(code).order(ByteOrder.nativeOrder()).putLong(2, addr);

			linkCode(TestNativeCode.class.getMethod("dummy"), code);

		} catch (NoSuchMethodException e) {

			throw new RuntimeException(e);

		}

	}



	public static void testDummyNaked() {

		var t = System.nanoTime();

		for (int i = 0; i < 1_000_000; i++)

			dummy();

		System.err.format("%-24s:%13d, %8d ns/1M-invokes\n", "testDummyNaked", 0, System.nanoTime() - t);

	}



	public static native int add(int a, int b);



	static {

		try {

			var code = new byte[]{

					(byte)0x89, (byte)0xd1, // mov ecx, edx

					0x44, (byte)0x89, (byte)0xc2, // mov edx, r8d

					0x48, (byte)0xb8, 0, 0, 0, 0, 0, 0, 0, 0, // mov rax, func_addr

					(byte)0xff, (byte)0xe0, // jmp rax

					0, 0, 0, // 4-byte align padding

					0x41, (byte)0x81, 0x7f, 0, 0 // barrier

			};

			var lib = SymbolLookup.libraryLookup("add.dll", Arena.global());

			var addr = lib.find("add").orElseThrow().address();

			ByteBuffer.wrap(code).order(ByteOrder.nativeOrder()).putLong(7, addr);

			linkCode(TestNativeCode.class.getMethod("add", int.class, int.class), code);

		} catch (NoSuchMethodException e) {

			throw new RuntimeException(e);

		}

	}



	public static void testAdd() {

		int r = 0;

		var t = System.nanoTime();

		for (int i = 0; i < 1_000_000; i++)

			r = add(r, i);

		System.err.format("%-24s:%13d, %8d ns/1M-invokes\n", "testAdd", r, System.nanoTime() - t);

	}



	public static native int addNaked(int a, int b);



	static {

		try {

			var code = new byte[]{

					0x48, (byte)0xb8, 0, 0, 0, 0, 0, 0, 0, 0, // mov rax, func_addr

					(byte)0xff, (byte)0xe0, // jmp rax

					// 4-byte align padding

					0x41, (byte)0x81, 0x7f, 0, 0 // barrier

			};

			var lib = SymbolLookup.libraryLookup("add.dll", Arena.global());

			var addr = lib.find("addNaked").orElseThrow().address();

			ByteBuffer.wrap(code).order(ByteOrder.nativeOrder()).putLong(2, addr);

			linkCode(TestNativeCode.class.getMethod("addNaked", int.class, int.class), code);

		} catch (NoSuchMethodException e) {

			throw new RuntimeException(e);

		}

	}



	public static void testAddNaked() {

		int r = 0;

		var t = System.nanoTime();

		for (int i = 0; i < 1_000_000; i++)

			r = addNaked(r, i);

		System.err.format("%-24s:%13d, %8d ns/1M-invokes\n", "testAddNaked", r, System.nanoTime() - t);

	}



	private static final MethodHandle mhAdd;



	static {

		var lib = SymbolLookup.libraryLookup("add.dll", Arena.global());

		mhAdd = Linker.nativeLinker().downcallHandle(lib.find("add").orElseThrow(),

				FunctionDescriptor.of(JAVA_INT, JAVA_INT, JAVA_INT));

	}



	public static void testAddPanama() {

		try {

			int r = 0;

			var t = System.nanoTime();

			for (int i = 0; i < 1_000_000; i++)

				r = (int)mhAdd.invokeExact(r, i);

			System.err.format("%-24s:%13d, %8d ns/1M-invokes\n", "testAddPanama", r, System.nanoTime() - t);

		} catch (Throwable e) {

			throw new RuntimeException(e);

		}

	}



	private static final MethodHandle mhAddCritical;



	static {

		var lib = SymbolLookup.libraryLookup("add.dll", Arena.global());

		mhAddCritical = Linker.nativeLinker().downcallHandle(lib.find("add").orElseThrow(),

				FunctionDescriptor.of(JAVA_INT, JAVA_INT, JAVA_INT), Linker.Option.critical(false));

	}



	public static void testAddPanamaCritical() {

		try {

			int r = 0;

			var t = System.nanoTime();

			for (int i = 0; i < 1_000_000; i++)

				r = (int)mhAddCritical.invokeExact(r, i);

			System.err.format("%-24s:%13d, %8d ns/1M-invokes\n", "testAddPanamaCritical", r, System.nanoTime() - t);

		} catch (Throwable e) {

			throw new RuntimeException(e);

		}

	}



	public static void testAddJni() {

		try {

			int r = 0;

			var t = System.nanoTime();

			for (int i = 0; i < 1_000_000; i++)

				r = TestJNI.nativeAdd(r, i);

			System.err.format("%-24s:%13d, %8d ns/1M-invokes\n", "testAddJni", r, System.nanoTime() - t);

		} catch (Throwable e) {

			throw new RuntimeException(e);

		}

	}



	public static int addJava(int a, int b) {

		return a + b;

	}



	// -XX:-Inline

	public static void testAddJava() {

		try {

			int r = 0;

			var t = System.nanoTime();

			for (int i = 0; i < 1_000_000; i++)

				r = addJava(r, i);

			System.err.format("%-24s:%13d, %8d ns/1M-invokes\n", "testAddJava", r, System.nanoTime() - t);

		} catch (Throwable e) {

			throw new RuntimeException(e);

		}

	}



	public static native long rdtsc();



	static {

		try {

			linkCode(TestNativeCode.class.getMethod("rdtsc"), new byte[]{

					0x0f, 0x31, // rdtsc

					0x48, (byte)0xc1, (byte)0xe2, 0x20, // shl rdx,32

					0x48, 0x09, (byte)0xd0, // or rax,rdx

					(byte)0xc3, // ret

					0, 0, // 4-byte align padding

					0x41, (byte)0x81, 0x7f, 0, 0 // barrier

			});

		} catch (NoSuchMethodException e) {

			throw new RuntimeException(e);

		}

	}



	public static void testRdtsc() {

		var t = System.nanoTime();

		long r = 0;

		for (int i = 0; i < 1_000_000; i++)

			r += rdtsc();

		System.err.format("%-24s:%13d, %8d ns/1M-invokes\n", "testRdtsc", r, System.nanoTime() - t);

	}



	public static native float rsqrtss(float a);



	static {

		try {

			linkCode(TestNativeCode.class.getMethod("rsqrtss", float.class), new byte[]{

					(byte)0xf3, 0x0f, 0x52, (byte)0xc0, // rsqrtss xmm0,xmm0

					(byte)0xc3, // ret

					0, 0, 0, // 4-byte align padding

					0x41, (byte)0x81, 0x7f, 0, 0 // barrier

			});

		} catch (NoSuchMethodException e) {

			throw new RuntimeException(e);

		}

	}



	public static void testRsqrtss() {

		var t = System.nanoTime();

		float r = 0;

		for (int i = 1; i <= 1_000_000; i++)

			r += rsqrtss(i);

		System.err.format("%-24s:%13f, %8d ns/1M-invokes\n", "testRsqrtss", r, System.nanoTime() - t);

	}



	public static native float rsqrtss1(float a);



	static {

		try {

			linkCode(TestNativeCode.class.getMethod("rsqrtss1", float.class), new byte[]{

					(byte)0xf3, 0x0f, 0x52, (byte)0xc8, // 0x00: rsqrtss xmm1, xmm0

					(byte)0xf3, 0x0f, 0x59, (byte)0xc1, // 0x04: mulss xmm0, xmm1

					(byte)0xf3, 0x0f, 0x59, (byte)0xc1, // 0x08: mulss xmm0, xmm1

					(byte)0xf3, 0x0f, 0x59, 0x0d, 0x10, 0, 0, 0, // 0x0c: mulss xmm1, dword ptr[rip+0x10] (0x24)

					(byte)0xf3, 0x0f, 0x58, 0x05, 0x0c, 0, 0, 0, // 0x14: addss xmm0, dword ptr[rip+0x0c] (0x28)

					(byte)0xf3, 0x0f, 0x59, (byte)0xc1, // 0x1c: mulss xmm0, xmm1

					(byte)0xc3, // 0x20: ret

					0, 0, 0, // 0x21: 4-byte align padding

					0, 0, 0, (byte)0xbf, // 0x24: -0.5f

					0, 0, 0x40, (byte)0xc0, // 0x28: -3.0f

					// 4-byte align padding

					0x41, (byte)0x81, 0x7f, 0, 0 // barrier

			});

		} catch (NoSuchMethodException e) {

			throw new RuntimeException(e);

		}

	}



	public static void testRsqrtss1() {

		var t = System.nanoTime();

		float r = 0;

		for (int i = 1; i <= 1_000_000; i++)

			r += rsqrtss1(i);

		System.err.format("%-24s:%13f, %8d ns/1M-invokes\n", "testRsqrtss1", r, System.nanoTime() - t);

	}



	public static float rsqrtss1Java(float a) {

		float r = rsqrtss(a);

		return (a * r * r - 3) * (r * -0.5f);

	}



	public static void testRsqrtss1Java() {

		var t = System.nanoTime();

		float r = 0;

		for (int i = 1; i <= 1_000_000; i++)

			r += rsqrtss1Java(i);

		System.err.format("%-24s:%13f, %8d ns/1M-invokes\n", "testRsqrtss1Java", r, System.nanoTime() - t);

	}



	public static float rsqrtJava(float a) {

		return 1 / (float)Math.sqrt(a);

	}



	public static void testRsqrtJava() {

		var t = System.nanoTime();

		float r = 0;

		for (int i = 1; i <= 1_000_000; i++)

			r += rsqrtJava(i);

		System.err.format("%-24s:%13f, %8d ns/1M-invokes\n", "testRsqrtJava", r, System.nanoTime() - t);

	}



	// | 0 1 2 3 |

	// | 4 5 6 7 |

	// | 8 9 10 11 | m0 * m1 => m2

	// | 12 13 14 15 | m2[0] = m0[0,1,2,3] *+ m1[0,4,8,12]; ...

	public static native float matMul256(long m0, long m1, long m2); // need AVX



	static {

		try {

			linkCode(TestNativeCode.class.getMethod("matMul256", long.class, long.class, long.class), new byte[]{

					(byte)0xC5, (byte)0xFC, (byte)0x10, (byte)0x02, (byte)0xC5, (byte)0xFC, (byte)0x10, (byte)0x4A,

					(byte)0x20, (byte)0xC4, (byte)0xC2, (byte)0x7D, (byte)0x1A, (byte)0x20, (byte)0xC4, (byte)0xC3,

					(byte)0x4D, (byte)0x06, (byte)0x30, (byte)0x33, (byte)0xC5, (byte)0xFC, (byte)0xC6, (byte)0xD0,

					(byte)0x00, (byte)0xC5, (byte)0xF4, (byte)0xC6, (byte)0xD9, (byte)0x00, (byte)0xC5, (byte)0xEC,

					(byte)0x59, (byte)0xD4, (byte)0xC5, (byte)0xE4, (byte)0x59, (byte)0xDC, (byte)0xC5, (byte)0xFC,

					(byte)0xC6, (byte)0xE0, (byte)0x55, (byte)0xC5, (byte)0xF4, (byte)0xC6, (byte)0xE9, (byte)0x55,

					(byte)0xC4, (byte)0xE2, (byte)0x5D, (byte)0xB8, (byte)0xD6, (byte)0xC4, (byte)0xE2, (byte)0x55,

					(byte)0xB8, (byte)0xDE, (byte)0xC5, (byte)0xFC, (byte)0xC6, (byte)0xE0, (byte)0xAA, (byte)0xC5,

					(byte)0xF4, (byte)0xC6, (byte)0xE9, (byte)0xAA, (byte)0xC4, (byte)0xC2, (byte)0x7D, (byte)0x1A,

					(byte)0x70, (byte)0x20, (byte)0xC4, (byte)0xE2, (byte)0x6D, (byte)0x98, (byte)0xE6, (byte)0xC4,

					(byte)0xE2, (byte)0x65, (byte)0x98, (byte)0xEE, (byte)0xC5, (byte)0xFC, (byte)0xC6, (byte)0xC0,

					(byte)0xFF, (byte)0xC5, (byte)0xF4, (byte)0xC6, (byte)0xC9, (byte)0xFF, (byte)0xC4, (byte)0xC3,

					(byte)0x4D, (byte)0x06, (byte)0x70, (byte)0x20, (byte)0x33, (byte)0xC4, (byte)0xE2, (byte)0x5D,

					(byte)0x98, (byte)0xC6, (byte)0xC4, (byte)0xE2, (byte)0x55, (byte)0x98, (byte)0xCE, (byte)0xC4,

					(byte)0xC1, (byte)0x7C, (byte)0x11, (byte)0x01, (byte)0xC4, (byte)0xC1, (byte)0x7C, (byte)0x11,

					(byte)0x49, (byte)0x20, (byte)0xC5, (byte)0xF8, (byte)0x77, (byte)0xC3,

					0, 0, // 4-byte align padding

					0x41, (byte)0x81, 0x7f, 0, 0 // barrier

			});

/* only for windows and x64 with AVX & FMA3

vmovups			ymm0, [rdx]

vmovups			ymm1, [rdx+0x20]

vshufps			ymm2, ymm0, ymm0, 0

vshufps			ymm3, ymm1, ymm1, 0

vbroadcastf128	ymm4, [r8]

vmulps			ymm2, ymm2, ymm4

vmulps			ymm3, ymm3, ymm4

vshufps			ymm4, ymm0, ymm0, 0x55

vshufps			ymm5, ymm1, ymm1, 0x55

vperm2f128		ymm6, ymm0, [r8], 0x33

vfmadd231ps		ymm2, ymm4, ymm6

vfmadd231ps		ymm3, ymm5, ymm6

vshufps			ymm4, ymm0, ymm0, 0xaa

vshufps			ymm5, ymm1, ymm1, 0xaa

vbroadcastf128	ymm6, [r8+0x20]

vfmadd132ps		ymm4, ymm2, ymm6

vfmadd132ps		ymm5, ymm3, ymm6

vshufps			ymm0, ymm0, ymm0, 0xff

vshufps			ymm1, ymm1, ymm1, 0xff

vperm2f128		ymm6, ymm0, [r8+0x20], 0x33

vfmadd132ps		ymm0, ymm4, ymm6

vfmadd132ps		ymm1, ymm5, ymm6

vmovups			[r9], ymm0

vmovups			[r9+0x20], ymm1

vzeroupper

ret

*/

		} catch (NoSuchMethodException e) {

			throw new RuntimeException(e);

		}

	}



	private static final VectorShuffle<Float> s01230123 = SPECIES_256.shuffleFromValues(0, 1, 2, 3, 0, 1, 2, 3); // _mm256_permute2f128_ps(..., 0x00);

	private static final VectorShuffle<Float> s45674567 = SPECIES_256.shuffleFromValues(4, 5, 6, 7, 4, 5, 6, 7); // _mm256_permute2f128_ps(..., 0x11);

	private static final VectorShuffle<Float> s00004444 = SPECIES_256.shuffleFromValues(0, 0, 0, 0, 4, 4, 4, 4); // _MM_SHUFFLE(0, 0, 0, 0)

	private static final VectorShuffle<Float> s11115555 = SPECIES_256.shuffleFromValues(1, 1, 1, 1, 5, 5, 5, 5); // _MM_SHUFFLE(1, 1, 1, 1)

	private static final VectorShuffle<Float> s22226666 = SPECIES_256.shuffleFromValues(2, 2, 2, 2, 6, 6, 6, 6); // _MM_SHUFFLE(2, 2, 2, 2)

	private static final VectorShuffle<Float> s33337777 = SPECIES_256.shuffleFromValues(3, 3, 3, 3, 7, 7, 7, 7); // _MM_SHUFFLE(3, 3, 3, 3)



	public static void matMul256(MemorySegment m0, MemorySegment m1, MemorySegment m2) {

		var t0 = FloatVector.fromMemorySegment(SPECIES_256, m0, 0, nativeOrder());

		var t1 = FloatVector.fromMemorySegment(SPECIES_256, m0, 32, nativeOrder());

		var u0 = FloatVector.fromMemorySegment(SPECIES_256, m1, 0, nativeOrder());

		var u1 = FloatVector.fromMemorySegment(SPECIES_256, m1, 32, nativeOrder());

		var u0r00 = u0.rearrange(s01230123);

		var u1r00 = u1.rearrange(s01230123);

		var u0r11 = u0.rearrange(s45674567);

		var u1r11 = u1.rearrange(s45674567);

		t0.rearrange(s00004444).fma(u0r00, t0.rearrange(s11115555).mul(u0r11))

				.add(t0.rearrange(s33337777).fma(u1r11, t0.rearrange(s22226666).mul(u1r00)))

				.intoMemorySegment(m2, 0, nativeOrder());

		t1.rearrange(s00004444).fma(u0r00, t1.rearrange(s11115555).mul(u0r11))

				.add(t1.rearrange(s33337777).fma(u1r11, t1.rearrange(s22226666).mul(u1r00)))

				.intoMemorySegment(m2, 32, nativeOrder());

	}



	public static void matMulJava(MemorySegment m0, MemorySegment m1, MemorySegment m2) {

		float f0, f1, f2, f3;

		//@formatter:off

		f0 = m0.get(JAVA_FLOAT, 0); f1 = m0.get(JAVA_FLOAT, 4); f2 = m0.get(JAVA_FLOAT, 8); f3 = m0.get(JAVA_FLOAT, 12);

		m2.set(JAVA_FLOAT, 0, f0 * m1.get(JAVA_FLOAT, 0) + f1 * m1.get(JAVA_FLOAT, 16) + f2 * m1.get(JAVA_FLOAT, 32) + f3 * m1.get(JAVA_FLOAT, 48));

		m2.set(JAVA_FLOAT, 4, f0 * m1.get(JAVA_FLOAT, 4) + f1 * m1.get(JAVA_FLOAT, 20) + f2 * m1.get(JAVA_FLOAT, 36) + f3 * m1.get(JAVA_FLOAT, 52));

		m2.set(JAVA_FLOAT, 8, f0 * m1.get(JAVA_FLOAT, 8) + f1 * m1.get(JAVA_FLOAT, 24) + f2 * m1.get(JAVA_FLOAT, 40) + f3 * m1.get(JAVA_FLOAT, 56));

		m2.set(JAVA_FLOAT, 12, f0 * m1.get(JAVA_FLOAT, 12) + f1 * m1.get(JAVA_FLOAT, 28) + f2 * m1.get(JAVA_FLOAT, 44) + f3 * m1.get(JAVA_FLOAT, 60));

		f0 = m0.get(JAVA_FLOAT, 16); f1 = m0.get(JAVA_FLOAT, 20); f2 = m0.get(JAVA_FLOAT, 24); f3 = m0.get(JAVA_FLOAT, 28);

		m2.set(JAVA_FLOAT, 16, f0 * m1.get(JAVA_FLOAT, 0) + f1 * m1.get(JAVA_FLOAT, 16) + f2 * m1.get(JAVA_FLOAT, 32) + f3 * m1.get(JAVA_FLOAT, 48));

		m2.set(JAVA_FLOAT, 20, f0 * m1.get(JAVA_FLOAT, 4) + f1 * m1.get(JAVA_FLOAT, 20) + f2 * m1.get(JAVA_FLOAT, 36) + f3 * m1.get(JAVA_FLOAT, 52));

		m2.set(JAVA_FLOAT, 24, f0 * m1.get(JAVA_FLOAT, 8) + f1 * m1.get(JAVA_FLOAT, 24) + f2 * m1.get(JAVA_FLOAT, 40) + f3 * m1.get(JAVA_FLOAT, 56));

		m2.set(JAVA_FLOAT, 28, f0 * m1.get(JAVA_FLOAT, 12) + f1 * m1.get(JAVA_FLOAT, 28) + f2 * m1.get(JAVA_FLOAT, 44) + f3 * m1.get(JAVA_FLOAT, 60));

		f0 = m0.get(JAVA_FLOAT, 32); f1 = m0.get(JAVA_FLOAT, 36); f2 = m0.get(JAVA_FLOAT, 40); f3 = m0.get(JAVA_FLOAT, 44);

		m2.set(JAVA_FLOAT, 32, f0 * m1.get(JAVA_FLOAT, 0) + f1 * m1.get(JAVA_FLOAT, 16) + f2 * m1.get(JAVA_FLOAT, 32) + f3 * m1.get(JAVA_FLOAT, 48));

		m2.set(JAVA_FLOAT, 36, f0 * m1.get(JAVA_FLOAT, 4) + f1 * m1.get(JAVA_FLOAT, 20) + f2 * m1.get(JAVA_FLOAT, 36) + f3 * m1.get(JAVA_FLOAT, 52));

		m2.set(JAVA_FLOAT, 40, f0 * m1.get(JAVA_FLOAT, 8) + f1 * m1.get(JAVA_FLOAT, 24) + f2 * m1.get(JAVA_FLOAT, 40) + f3 * m1.get(JAVA_FLOAT, 56));

		m2.set(JAVA_FLOAT, 44, f0 * m1.get(JAVA_FLOAT, 12) + f1 * m1.get(JAVA_FLOAT, 28) + f2 * m1.get(JAVA_FLOAT, 44) + f3 * m1.get(JAVA_FLOAT, 60));

		f0 = m0.get(JAVA_FLOAT, 48); f1 = m0.get(JAVA_FLOAT, 52); f2 = m0.get(JAVA_FLOAT, 56); f3 = m0.get(JAVA_FLOAT, 60);

		m2.set(JAVA_FLOAT, 48, f0 * m1.get(JAVA_FLOAT, 0) + f1 * m1.get(JAVA_FLOAT, 16) + f2 * m1.get(JAVA_FLOAT, 32) + f3 * m1.get(JAVA_FLOAT, 48));

		m2.set(JAVA_FLOAT, 52, f0 * m1.get(JAVA_FLOAT, 4) + f1 * m1.get(JAVA_FLOAT, 20) + f2 * m1.get(JAVA_FLOAT, 36) + f3 * m1.get(JAVA_FLOAT, 52));

		m2.set(JAVA_FLOAT, 56, f0 * m1.get(JAVA_FLOAT, 8) + f1 * m1.get(JAVA_FLOAT, 24) + f2 * m1.get(JAVA_FLOAT, 40) + f3 * m1.get(JAVA_FLOAT, 56));

		m2.set(JAVA_FLOAT, 60, f0 * m1.get(JAVA_FLOAT, 12) + f1 * m1.get(JAVA_FLOAT, 28) + f2 * m1.get(JAVA_FLOAT, 44) + f3 * m1.get(JAVA_FLOAT, 60));

		//@formatter:on

	}



	public static void matMulJavaFma(MemorySegment m0, MemorySegment m1, MemorySegment m2) {

		float f0, f1, f2, f3;

		//@formatter:off

		f0 = m0.get(JAVA_FLOAT, 0); f1 = m0.get(JAVA_FLOAT, 4); f2 = m0.get(JAVA_FLOAT, 8); f3 = m0.get(JAVA_FLOAT, 12);

		m2.set(JAVA_FLOAT, 0, Math.fma(f0, m1.get(JAVA_FLOAT, 0), Math.fma(f1, m1.get(JAVA_FLOAT, 16), Math.fma(f2, m1.get(JAVA_FLOAT, 32), f3 * m1.get(JAVA_FLOAT, 48)))));

		m2.set(JAVA_FLOAT, 4, Math.fma(f0, m1.get(JAVA_FLOAT, 4), Math.fma(f1, m1.get(JAVA_FLOAT, 20), Math.fma(f2, m1.get(JAVA_FLOAT, 36), f3 * m1.get(JAVA_FLOAT, 52)))));

		m2.set(JAVA_FLOAT, 8, Math.fma(f0, m1.get(JAVA_FLOAT, 8), Math.fma(f1, m1.get(JAVA_FLOAT, 24), Math.fma(f2, m1.get(JAVA_FLOAT, 40), f3 * m1.get(JAVA_FLOAT, 56)))));

		m2.set(JAVA_FLOAT, 12, Math.fma(f0, m1.get(JAVA_FLOAT, 12), Math.fma(f1, m1.get(JAVA_FLOAT, 28), Math.fma(f2, m1.get(JAVA_FLOAT, 44), f3 * m1.get(JAVA_FLOAT, 60)))));

		f0 = m0.get(JAVA_FLOAT, 16); f1 = m0.get(JAVA_FLOAT, 20); f2 = m0.get(JAVA_FLOAT, 24); f3 = m0.get(JAVA_FLOAT, 28);

		m2.set(JAVA_FLOAT, 16, Math.fma(f0, m1.get(JAVA_FLOAT, 0), Math.fma(f1, m1.get(JAVA_FLOAT, 16), Math.fma(f2, m1.get(JAVA_FLOAT, 32), f3 * m1.get(JAVA_FLOAT, 48)))));

		m2.set(JAVA_FLOAT, 20, Math.fma(f0, m1.get(JAVA_FLOAT, 4), Math.fma(f1, m1.get(JAVA_FLOAT, 20), Math.fma(f2, m1.get(JAVA_FLOAT, 36), f3 * m1.get(JAVA_FLOAT, 52)))));

		m2.set(JAVA_FLOAT, 24, Math.fma(f0, m1.get(JAVA_FLOAT, 8), Math.fma(f1, m1.get(JAVA_FLOAT, 24), Math.fma(f2, m1.get(JAVA_FLOAT, 40), f3 * m1.get(JAVA_FLOAT, 56)))));

		m2.set(JAVA_FLOAT, 28, Math.fma(f0, m1.get(JAVA_FLOAT, 12), Math.fma(f1, m1.get(JAVA_FLOAT, 28), Math.fma(f2, m1.get(JAVA_FLOAT, 44), f3 * m1.get(JAVA_FLOAT, 60)))));

		f0 = m0.get(JAVA_FLOAT, 32); f1 = m0.get(JAVA_FLOAT, 36); f2 = m0.get(JAVA_FLOAT, 40); f3 = m0.get(JAVA_FLOAT, 44);

		m2.set(JAVA_FLOAT, 32, Math.fma(f0, m1.get(JAVA_FLOAT, 0), Math.fma(f1, m1.get(JAVA_FLOAT, 16), Math.fma(f2, m1.get(JAVA_FLOAT, 32), f3 * m1.get(JAVA_FLOAT, 48)))));

		m2.set(JAVA_FLOAT, 36, Math.fma(f0, m1.get(JAVA_FLOAT, 4), Math.fma(f1, m1.get(JAVA_FLOAT, 20), Math.fma(f2, m1.get(JAVA_FLOAT, 36), f3 * m1.get(JAVA_FLOAT, 52)))));

		m2.set(JAVA_FLOAT, 40, Math.fma(f0, m1.get(JAVA_FLOAT, 8), Math.fma(f1, m1.get(JAVA_FLOAT, 24), Math.fma(f2, m1.get(JAVA_FLOAT, 40), f3 * m1.get(JAVA_FLOAT, 56)))));

		m2.set(JAVA_FLOAT, 44, Math.fma(f0, m1.get(JAVA_FLOAT, 12), Math.fma(f1, m1.get(JAVA_FLOAT, 28), Math.fma(f2, m1.get(JAVA_FLOAT, 44), f3 * m1.get(JAVA_FLOAT, 60)))));

		f0 = m0.get(JAVA_FLOAT, 48); f1 = m0.get(JAVA_FLOAT, 52); f2 = m0.get(JAVA_FLOAT, 56); f3 = m0.get(JAVA_FLOAT, 60);

		m2.set(JAVA_FLOAT, 48, Math.fma(f0, m1.get(JAVA_FLOAT, 0), Math.fma(f1, m1.get(JAVA_FLOAT, 16), Math.fma(f2, m1.get(JAVA_FLOAT, 32), f3 * m1.get(JAVA_FLOAT, 48)))));

		m2.set(JAVA_FLOAT, 52, Math.fma(f0, m1.get(JAVA_FLOAT, 4), Math.fma(f1, m1.get(JAVA_FLOAT, 20), Math.fma(f2, m1.get(JAVA_FLOAT, 36), f3 * m1.get(JAVA_FLOAT, 52)))));

		m2.set(JAVA_FLOAT, 56, Math.fma(f0, m1.get(JAVA_FLOAT, 8), Math.fma(f1, m1.get(JAVA_FLOAT, 24), Math.fma(f2, m1.get(JAVA_FLOAT, 40), f3 * m1.get(JAVA_FLOAT, 56)))));

		m2.set(JAVA_FLOAT, 60, Math.fma(f0, m1.get(JAVA_FLOAT, 12), Math.fma(f1, m1.get(JAVA_FLOAT, 28), Math.fma(f2, m1.get(JAVA_FLOAT, 44), f3 * m1.get(JAVA_FLOAT, 60)))));

		//@formatter:on

	}



	public static void printMat(MemorySegment m) {

		System.out.format("%12.6f %12.6f %12.6f %12.6f\n", m.get(JAVA_FLOAT, 0), m.get(JAVA_FLOAT, 4), m.get(JAVA_FLOAT, 8), m.get(JAVA_FLOAT, 12));

		System.out.format("%12.6f %12.6f %12.6f %12.6f\n", m.get(JAVA_FLOAT, 16), m.get(JAVA_FLOAT, 20), m.get(JAVA_FLOAT, 24), m.get(JAVA_FLOAT, 28));

		System.out.format("%12.6f %12.6f %12.6f %12.6f\n", m.get(JAVA_FLOAT, 32), m.get(JAVA_FLOAT, 36), m.get(JAVA_FLOAT, 40), m.get(JAVA_FLOAT, 44));

		System.out.format("%12.6f %12.6f %12.6f %12.6f\n", m.get(JAVA_FLOAT, 48), m.get(JAVA_FLOAT, 52), m.get(JAVA_FLOAT, 56), m.get(JAVA_FLOAT, 60));

		System.out.println("---");

	}



	private static final MemorySegment m0, m1, m2;



	static {

		m0 = Arena.global().allocate(64, 64);

		m1 = Arena.global().allocate(64, 64);

		m2 = Arena.global().allocate(64, 64);

		for (int i = 0; i < 64; i += 4) {

			m0.set(JAVA_FLOAT, i, (float)i / 4 + 2);

			m1.set(JAVA_FLOAT, i, 17 - (float)i / 4);

		}

	}



	public static void testMatMulJvmci() {

		long p0 = m0.address();

		long p1 = m1.address();

		long p2 = m2.address();

		var t = System.nanoTime();

		for (int i = 0; i < 1_000_000; i++)

			matMul256(p0, p1, p2);

		System.err.format("%-24s:%13f, %8d ns/1M-invokes\n", "testMatMulJvmci", 0f, System.nanoTime() - t);

		// printMat(m2);

	}



	private static final MethodHandle mhMatMulAvx;



	static {

		var lib = SymbolLookup.libraryLookup("vec_x64.dll", Arena.global());

		mhMatMulAvx = Linker.nativeLinker().downcallHandle(lib.find("matMulAvx").orElseThrow(),

				FunctionDescriptor.ofVoid(JAVA_LONG, JAVA_LONG, JAVA_LONG), Linker.Option.critical(false));

	}



	public static void testMatMulPanamaCritical() {

		try {

			long p0 = m0.address();

			long p1 = m1.address();

			long p2 = m2.address();

			var t = System.nanoTime();

			for (int i = 0; i < 1_000_000; i++)

				mhMatMulAvx.invokeExact(p0, p1, p2);

			System.err.format("%-24s:%13f, %8d ns/1M-invokes\n", "testMatMulPanamaCritical", 0f, System.nanoTime() - t);

			// printMat(m2);

		} catch (Throwable e) {

			throw new RuntimeException(e);

		}

	}



	public static void testMatMulVector() {

		var t = System.nanoTime();

		for (int i = 0; i < 1_000_000; i++)

			matMul256(m0, m1, m2);

		System.err.format("%-24s:%13f, %8d ns/1M-invokes\n", "testMatMulVector", 0f, System.nanoTime() - t);

		// printMat(m2);

	}



	public static void testMatMulJava() {

		var t = System.nanoTime();

		for (int i = 0; i < 1_000_000; i++)

			matMulJava(m0, m1, m2);

		System.err.format("%-24s:%13f, %8d ns/1M-invokes\n", "testMatMulJava", 0f, System.nanoTime() - t);

		// printMat(m2);

	}



	public static void testMatMulJavaFma() {

		var t = System.nanoTime();

		for (int i = 0; i < 1_000_000; i++)

			matMulJavaFma(m0, m1, m2);

		System.err.format("%-24s:%13f, %8d ns/1M-invokes\n", "testMatMulJavaFma", 0f, System.nanoTime() - t);

		// printMat(m2);

	}



	public static void main(String[] args) {

		for (int i = 0; i < 10; i++) {

			System.err.println("---"); // OpenJDK23

			testDummyNaked(); // 1.4005 ns

			testAddNaked(); // 1.6334 ns

			testAdd(); // 1.6333 ns

			testAddPanamaCritical(); // 2.5720 ns (static final)

			testAddPanama(); // 7.7158 ns (static final)

			testAddJni(); // 8.4009 ns

			testAddJava(); // 1.2278 ns (-XX:-Inline) 0.2404 ns (default)



			testRsqrtss(); // 2.1006 ns (low precision)

			testRsqrtss1(); // 5.6468 ns (good precision)

			testRsqrtss1Java(); // 2.6830 ns (-XX:-Inline) 2.1009 ns (default) (good precision)

			testRsqrtJava(); // 2.2459 ns (-XX:-Inline) 1.4010 ns (default) (best precision)



			testRdtsc(); // 5.9552 ns



			testMatMulJvmci(); // 2.5668 ns

			testMatMulPanamaCritical(); // 3.7344 ns

			testMatMulVector(); // 5.6001 ns

			testMatMulJava(); //27.1248 ns

			testMatMulJavaFma(); //24.7380 ns

		}

	}

}

/*

 x64 calling convention (Linux, macOS):

	 Java: rsi, rdx, rcx, r8, r9, rdi, stack

 Native: rdi, rsi, rdx, rcx, r8, r9, stack

 x64 calling convention (Windows):

	 Java: rdx, r8, r9, rdi, rsi, rcx, stack

 Native: rcx, rdx, r8, r9, stack

 AArch64 calling convention:

	 Java: x1, x2, x3, x4, x5, x6, x7, x0, stack

 Native: x0, x1, x2, x3, x4, x5, x6, x7, stack

 RISCV64 calling convention:

	 Java: x10, x11, x12, x13, x14, x15, x16, x17, stack

 Native: x10, x11, x12, x13, x14, x15, x16, x17, stack

*/
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