Reproduce limitation of current 8 bit register allocation
Bug: b/374266460
Change-Id: I4c9cf6d19d39ff8b773863f7bd43c35c6839aa6a
diff --git a/src/test/java/com/android/tools/r8/ir/regalloc/ArgumentIn4BitRegisterTest.java b/src/test/java/com/android/tools/r8/ir/regalloc/ArgumentIn4BitRegisterTest.java
new file mode 100644
index 0000000..d2b9b6e
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/ir/regalloc/ArgumentIn4BitRegisterTest.java
@@ -0,0 +1,71 @@
+// 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 ArgumentIn4BitRegisterTest extends TestBase {
+
+ @Parameter(0)
+ public TestParameters parameters;
+
+ @Parameters(name = "{0}")
+ public static TestParametersCollection data() {
+ return getTestParameters().withDexRuntimesAndAllApiLevels().build();
+ }
+
+ @Test
+ public void test() throws Exception {
+ testForD8()
+ .addInnerClasses(getClass())
+ .release()
+ .setMinApi(parameters)
+ .compile()
+ .inspect(
+ inspector -> {
+ MethodSubject testMethodSubject =
+ inspector.clazz(Main.class).uniqueMethodWithOriginalName("test");
+ assertThat(testMethodSubject, isPresent());
+ // TODO(b/374266460): Should be 0.
+ assertEquals(
+ 1,
+ testMethodSubject
+ .streamInstructions()
+ .filter(InstructionSubject::isMove)
+ .count());
+ });
+ }
+
+ static class Main {
+
+ public static void test(
+ Object a, long b, long c, long d, long e, long f, long g, long h, long i) {
+ Main main = (Main) a;
+ // Keep all argument alive.
+ use(b);
+ use(c);
+ use(d);
+ use(e);
+ use(f);
+ use(h);
+ use(i);
+ }
+
+ private static void use(long a) {}
+ }
+}
