ART: Implement HBooleanNot instruction

Optimizations simplifying operations on boolean values (boolean
simplifier, instruction simplifier) can benefit from having a special
HInstruction for negating booleans in order to perform more transforms
and produce faster machine code.

This patch implements HBooleanNot as 'x xor 1', assuming that booleans
are 1-bit integers and allowing for a single-instruction negation on
all supported platforms.

Change-Id: I33a2649c1821255b18a86ca68ed16416063c739f

1 files changed, 51 insertions, 0 deletions

diff --git a/test/468-checker-bool-simplifier-regression/src/Main.java b/test/468-checker-bool-simplifier-regression/src/Main.java
new file mode 100644
index 0000000000..65f20b3427
--- /dev/null
+++ b/test/468-checker-bool-simplifier-regression/src/Main.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.lang.reflect.*;
+
+public class Main {
+  
+  // CHECK-START: boolean TestCase.testCase() boolean_simplifier (before)
+  // CHECK-DAG:     [[Const0:i\d+]]   IntConstant 0
+  // CHECK-DAG:     [[Const1:i\d+]]   IntConstant 1
+  // CHECK-DAG:     [[Value:z\d+]]    StaticFieldGet
+  // CHECK-DAG:                       If [ [[Value]] ]
+  // CHECK-DAG:     [[Phi:i\d+]]      Phi [ [[Const1]] [[Const0]] ]
+  // CHECK-DAG:                       Return [ [[Phi]] ]
+
+  // CHECK-START: boolean TestCase.testCase() boolean_simplifier (after)
+  // CHECK-DAG:     [[Value:z\d+]]    StaticFieldGet
+  // CHECK-DAG:     [[Not:z\d+]]      BooleanNot [ [[Value]] ]
+  // CHECK-DAG:                       Return [ [[Not]] ]
+  
+  public static boolean runTest(boolean input) throws Exception {
+    Class<?> c = Class.forName("TestCase");
+    Method m = c.getMethod("testCase");
+    Field f = c.getField("value");
+    f.set(null, (Boolean) input);
+    return (Boolean) m.invoke(null);
+  }
+
+  public static void main(String[] args) throws Exception {
+    if (runTest(true) != false) {
+      throw new Error("Expected false, got true");
+    }
+
+    if (runTest(false) != true) {
+      throw new Error("Expected true, got false");
+    }
+  }
+}