| /* |
| * 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]] ] |
| |
| 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)); |
| } |
| } |
