| /* |
| * 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. |
| */ |
| |
| public class Main { |
| |
| // Note #1: `javac` flips the conditions of If statements. |
| // Note #2: In the optimizing compiler, the first input of Phi is always |
| // the fall-through path, i.e. the false branch. |
| |
| public static void assertBoolEquals(boolean expected, boolean result) { |
| if (expected != result) { |
| throw new Error("Expected: " + expected + ", found: " + result); |
| } |
| } |
| |
| public static void assertIntEquals(int expected, int result) { |
| if (expected != result) { |
| throw new Error("Expected: " + expected + ", found: " + result); |
| } |
| } |
| |
| /* |
| * Elementary test negating a boolean. Verifies that blocks are merged and |
| * empty branches removed. |
| */ |
| |
| // CHECK-START: boolean Main.BooleanNot(boolean) boolean_simplifier (before) |
| // CHECK-DAG: <<Param:z\d+>> ParameterValue |
| // CHECK-DAG: <<Const0:i\d+>> IntConstant 0 |
| // CHECK-DAG: <<Const1:i\d+>> IntConstant 1 |
| // CHECK-DAG: If [ <<Param>> ] |
| // CHECK-DAG: <<Phi:i\d+>> Phi [ <<Const1>> <<Const0>> ] |
| // CHECK-DAG: Return [ <<Phi>> ] |
| |
| // CHECK-START: boolean Main.BooleanNot(boolean) boolean_simplifier (before) |
| // CHECK: Goto |
| // CHECK: Goto |
| // CHECK: Goto |
| // CHECK-NOT: Goto |
| |
| // CHECK-START: boolean Main.BooleanNot(boolean) boolean_simplifier (after) |
| // CHECK-DAG: <<Param:z\d+>> ParameterValue |
| // CHECK-DAG: <<Const0:i\d+>> IntConstant 0 |
| // CHECK-DAG: <<NotParam:z\d+>> BooleanNot [ <<Param>> ] |
| // CHECK-DAG: Return [ <<NotParam>> ] |
| |
| // CHECK-START: boolean Main.BooleanNot(boolean) boolean_simplifier (after) |
| // CHECK-NOT: If |
| // CHECK-NOT: Phi |
| |
| // CHECK-START: boolean Main.BooleanNot(boolean) boolean_simplifier (after) |
| // CHECK: Goto |
| // CHECK-NOT: Goto |
| |
| public static boolean BooleanNot(boolean x) { |
| return !x; |
| } |
| |
| /* |
| * Program which only delegates the condition, i.e. returns 1 when True |
| * and 0 when False. |
| */ |
| |
| // CHECK-START: boolean Main.GreaterThan(int, int) boolean_simplifier (before) |
| // CHECK-DAG: <<ParamX:i\d+>> ParameterValue |
| // CHECK-DAG: <<ParamY:i\d+>> ParameterValue |
| // CHECK-DAG: <<Const0:i\d+>> IntConstant 0 |
| // CHECK-DAG: <<Const1:i\d+>> IntConstant 1 |
| // CHECK-DAG: <<Cond:z\d+>> GreaterThan [ <<ParamX>> <<ParamY>> ] |
| // CHECK-DAG: If [ <<Cond>> ] |
| // CHECK-DAG: <<Phi:i\d+>> Phi [ <<Const0>> <<Const1>> ] |
| // CHECK-DAG: Return [ <<Phi>> ] |
| |
| // CHECK-START: boolean Main.GreaterThan(int, int) boolean_simplifier (after) |
| // CHECK-DAG: <<ParamX:i\d+>> ParameterValue |
| // CHECK-DAG: <<ParamY:i\d+>> ParameterValue |
| // CHECK-DAG: <<Const0:i\d+>> IntConstant 0 |
| // CHECK-DAG: <<Const1:i\d+>> IntConstant 1 |
| // CHECK-DAG: <<Cond:z\d+>> GreaterThan [ <<ParamX>> <<ParamY>> ] |
| // CHECK-DAG: Return [ <<Cond>> ] |
| |
| public static boolean GreaterThan(int x, int y) { |
| return (x <= y) ? false : true; |
| } |
| |
| /* |
| * Program which negates a condition, i.e. returns 0 when True |
| * and 1 when False. |
| */ |
| |
| // CHECK-START: boolean Main.LessThan(int, int) boolean_simplifier (before) |
| // CHECK-DAG: <<ParamX:i\d+>> ParameterValue |
| // CHECK-DAG: <<ParamY:i\d+>> ParameterValue |
| // CHECK-DAG: <<Const0:i\d+>> IntConstant 0 |
| // CHECK-DAG: <<Const1:i\d+>> IntConstant 1 |
| // CHECK-DAG: <<Cond:z\d+>> GreaterThanOrEqual [ <<ParamX>> <<ParamY>> ] |
| // CHECK-DAG: If [ <<Cond>> ] |
| // CHECK-DAG: <<Phi:i\d+>> Phi [ <<Const1>> <<Const0>> ] |
| // CHECK-DAG: Return [ <<Phi>> ] |
| |
| // CHECK-START: boolean Main.LessThan(int, int) boolean_simplifier (after) |
| // CHECK-DAG: <<ParamX:i\d+>> ParameterValue |
| // CHECK-DAG: <<ParamY:i\d+>> ParameterValue |
| // CHECK-DAG: <<Const0:i\d+>> IntConstant 0 |
| // CHECK-DAG: <<Const1:i\d+>> IntConstant 1 |
| // CHECK-DAG: <<Cond:z\d+>> LessThan [ <<ParamX>> <<ParamY>> ] |
| // CHECK-DAG: Return [ <<Cond>> ] |
| |
| // CHECK-START: boolean Main.LessThan(int, int) boolean_simplifier (after) |
| // CHECK-NOT: GreaterThanOrEqual |
| |
| public static boolean LessThan(int x, int y) { |
| return (x < y) ? true : false; |
| } |
| |
| /* |
| * Program which further uses negated conditions. |
| * Note that Phis are discovered retrospectively. |
| */ |
| |
| // CHECK-START: boolean Main.ValuesOrdered(int, int, int) boolean_simplifier (before) |
| // CHECK-DAG: <<ParamX:i\d+>> ParameterValue |
| // CHECK-DAG: <<ParamY:i\d+>> ParameterValue |
| // CHECK-DAG: <<ParamZ:i\d+>> ParameterValue |
| // CHECK-DAG: <<Const0:i\d+>> IntConstant 0 |
| // CHECK-DAG: <<Const1:i\d+>> IntConstant 1 |
| // CHECK-DAG: <<CondXY:z\d+>> GreaterThan [ <<ParamX>> <<ParamY>> ] |
| // CHECK-DAG: If [ <<CondXY>> ] |
| // CHECK-DAG: <<CondYZ:z\d+>> GreaterThan [ <<ParamY>> <<ParamZ>> ] |
| // CHECK-DAG: If [ <<CondYZ>> ] |
| // CHECK-DAG: <<CondXYZ:z\d+>> NotEqual [ <<PhiXY:i\d+>> <<PhiYZ:i\d+>> ] |
| // CHECK-DAG: If [ <<CondXYZ>> ] |
| // CHECK-DAG: Return [ <<PhiXYZ:i\d+>> ] |
| // CHECK-DAG: <<PhiXY>> Phi [ <<Const1>> <<Const0>> ] |
| // CHECK-DAG: <<PhiYZ>> Phi [ <<Const1>> <<Const0>> ] |
| // CHECK-DAG: <<PhiXYZ>> Phi [ <<Const1>> <<Const0>> ] |
| |
| // CHECK-START: boolean Main.ValuesOrdered(int, int, int) boolean_simplifier (after) |
| // CHECK-DAG: <<ParamX:i\d+>> ParameterValue |
| // CHECK-DAG: <<ParamY:i\d+>> ParameterValue |
| // CHECK-DAG: <<ParamZ:i\d+>> ParameterValue |
| // CHECK-DAG: <<CmpXY:z\d+>> LessThanOrEqual [ <<ParamX>> <<ParamY>> ] |
| // CHECK-DAG: <<CmpYZ:z\d+>> LessThanOrEqual [ <<ParamY>> <<ParamZ>> ] |
| // CHECK-DAG: <<CmpXYZ:z\d+>> Equal [ <<CmpXY>> <<CmpYZ>> ] |
| // CHECK-DAG: Return [ <<CmpXYZ>> ] |
| |
| public static boolean ValuesOrdered(int x, int y, int z) { |
| return (x <= y) == (y <= z); |
| } |
| |
| // CHECK-START: int Main.NegatedCondition(boolean) boolean_simplifier (before) |
| // CHECK-DAG: <<Param:z\d+>> ParameterValue |
| // CHECK-DAG: <<Const42:i\d+>> IntConstant 42 |
| // CHECK-DAG: <<Const43:i\d+>> IntConstant 43 |
| // CHECK-DAG: <<NotParam:z\d+>> BooleanNot [ <<Param>> ] |
| // CHECK-DAG: If [ <<NotParam>> ] |
| // CHECK-DAG: <<Phi:i\d+>> Phi [ <<Const42>> <<Const43>> ] |
| // CHECK-DAG: Return [ <<Phi>> ] |
| |
| // CHECK-START: int Main.NegatedCondition(boolean) boolean_simplifier (after) |
| // CHECK-DAG: <<Param:z\d+>> ParameterValue |
| // CHECK-DAG: <<Const42:i\d+>> IntConstant 42 |
| // CHECK-DAG: <<Const43:i\d+>> IntConstant 43 |
| // CHECK-DAG: If [ <<Param>> ] |
| // CHECK-DAG: <<Phi:i\d+>> Phi [ <<Const42>> <<Const43>> ] |
| // CHECK-DAG: Return [ <<Phi>> ] |
| |
| // Note: The fact that branches are swapped is verified by running the test. |
| |
| // CHECK-START: int Main.NegatedCondition(boolean) boolean_simplifier (after) |
| // CHECK-NOT: BooleanNot |
| |
| public static int NegatedCondition(boolean x) { |
| if (x != false) { |
| return 42; |
| } else { |
| return 43; |
| } |
| } |
| |
| public static void main(String[] args) { |
| assertBoolEquals(false, BooleanNot(true)); |
| assertBoolEquals(true, BooleanNot(false)); |
| assertBoolEquals(true, GreaterThan(10, 5)); |
| assertBoolEquals(false, GreaterThan(10, 10)); |
| assertBoolEquals(false, GreaterThan(5, 10)); |
| assertBoolEquals(true, LessThan(5, 10)); |
| assertBoolEquals(false, LessThan(10, 10)); |
| assertBoolEquals(false, LessThan(10, 5)); |
| assertBoolEquals(true, ValuesOrdered(1, 3, 5)); |
| assertBoolEquals(true, ValuesOrdered(5, 3, 1)); |
| assertBoolEquals(false, ValuesOrdered(1, 3, 2)); |
| assertBoolEquals(false, ValuesOrdered(2, 3, 1)); |
| assertBoolEquals(true, ValuesOrdered(3, 3, 3)); |
| assertBoolEquals(true, ValuesOrdered(3, 3, 5)); |
| assertBoolEquals(false, ValuesOrdered(5, 5, 3)); |
| assertIntEquals(42, NegatedCondition(true)); |
| assertIntEquals(43, NegatedCondition(false)); |
| } |
| } |
