Reproduce many redundant argument moves to 4 bit registers
Bug: b/374266460
Change-Id: Idce0fefe92aa6cc5ebe79b666cca69e7f04ea938
diff --git a/src/test/java/com/android/tools/r8/ir/regalloc/ArgumentInLowRegisterWithMoreThan16RegistersTest.java b/src/test/java/com/android/tools/r8/ir/regalloc/ArgumentInLowRegisterWithMoreThan16RegistersTest.java
new file mode 100644
index 0000000..8885519
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/ir/regalloc/ArgumentInLowRegisterWithMoreThan16RegistersTest.java
@@ -0,0 +1,77 @@
+// Copyright (c) 2024, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+package com.android.tools.r8.ir.regalloc;
+
+import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertEquals;
+
+import com.android.tools.r8.TestBase;
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.TestParametersCollection;
+import com.android.tools.r8.utils.codeinspector.InstructionSubject;
+import com.android.tools.r8.utils.codeinspector.MethodSubject;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class ArgumentInLowRegisterWithMoreThan16RegistersTest extends TestBase {
+
+ @Parameter(0)
+ public TestParameters parameters;
+
+ @Parameters(name = "{0}")
+ public static TestParametersCollection data() {
+ return getTestParameters().withDefaultDexRuntime().withMaximumApiLevel().build();
+ }
+
+ @Test
+ public void testD8() throws Exception {
+ testForD8()
+ .addInnerClasses(getClass())
+ .release()
+ .setMinApi(parameters)
+ .compile()
+ .inspect(
+ inspector -> {
+ MethodSubject testMethodSubject =
+ inspector.clazz(Main.class).uniqueInstanceInitializer();
+ assertThat(testMethodSubject, isPresent());
+ // TODO(b/374266460): Leverage that most arguments are in 4 bit registers from the
+ // beginning.
+ assertEquals(
+ 9,
+ testMethodSubject
+ .streamInstructions()
+ .filter(InstructionSubject::isMove)
+ .count());
+ });
+ }
+
+ static class Main {
+
+ long a;
+ long b;
+ long c;
+ long d;
+ long e;
+ long f;
+ long g;
+ long h;
+
+ Main(long a, long b, long c, long d, long e, long f, long g, long h) {
+ this.a = a;
+ this.b = b;
+ this.c = c;
+ this.d = d;
+ this.e = e;
+ this.f = f;
+ this.g = g;
+ this.h = h;
+ }
+ }
+}
