/*
* 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) select_generator (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 [<<Const0>>,<<Const1>>]
/// CHECK-DAG: Return [<<Phi>>]
/// CHECK-START: boolean Main.BooleanNot(boolean) select_generator (before)
/// CHECK: Goto
/// CHECK: Goto
/// CHECK: Goto
/// CHECK-NOT: Goto
/// CHECK-START: boolean Main.BooleanNot(boolean) select_generator (after)
/// CHECK-DAG: <<Param:z\d+>> ParameterValue
/// CHECK-DAG: <<Const0:i\d+>> IntConstant 0
/// CHECK-DAG: <<Const1:i\d+>> IntConstant 1
/// CHECK-DAG: <<NotParam:i\d+>> Select [<<Const1>>,<<Const0>>,<<Param>>]
/// CHECK-DAG: Return [<<NotParam>>]
/// CHECK-START: boolean Main.BooleanNot(boolean) select_generator (after)
/// CHECK-NOT: If
/// CHECK-NOT: Phi
/// CHECK-START: boolean Main.BooleanNot(boolean) select_generator (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) select_generator (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) select_generator (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: <<Select:i\d+>> Select [<<Const0>>,<<Const1>>,<<Cond>>]
/// CHECK-DAG: Return [<<Select>>]
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) select_generator (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) select_generator (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+>> GreaterThanOrEqual [<<ParamX>>,<<ParamY>>]
/// CHECK-DAG: <<Select:i\d+>> Select [<<Const1>>,<<Const0>>,<<Cond>>]
/// CHECK-DAG: Return [<<Select>>]
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) select_generator (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) select_generator (after)
/// 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: <<CmpXY:z\d+>> GreaterThan [<<ParamX>>,<<ParamY>>]
/// CHECK-DAG: <<SelXY:i\d+>> Select [<<Const1>>,<<Const0>>,<<CmpXY>>]
/// CHECK-DAG: <<CmpYZ:z\d+>> GreaterThan [<<ParamY>>,<<ParamZ>>]
/// CHECK-DAG: <<SelYZ:i\d+>> Select [<<Const1>>,<<Const0>>,<<CmpYZ>>]
/// CHECK-DAG: <<CmpXYZ:z\d+>> NotEqual [<<SelXY>>,<<SelYZ>>]
/// CHECK-DAG: <<SelXYZ:i\d+>> Select [<<Const1>>,<<Const0>>,<<CmpXYZ>>]
/// CHECK-DAG: Return [<<SelXYZ>>]
public static boolean ValuesOrdered(int x, int y, int z) {
return (x <= y) == (y <= z);
}
/// CHECK-START: int Main.NegatedCondition(boolean) select_generator (before)
/// 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>>]
/// CHECK-START: int Main.NegatedCondition(boolean) select_generator (after)
/// CHECK-DAG: <<Param:z\d+>> ParameterValue
/// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
/// CHECK-DAG: <<Const43:i\d+>> IntConstant 43
/// CHECK-DAG: <<Select:i\d+>> Select [<<Const43>>,<<Const42>>,<<Param>>]
/// CHECK-DAG: Return [<<Select>>]
/// CHECK-START: int Main.NegatedCondition(boolean) select_generator (after)
/// CHECK-NOT: BooleanNot
public static int NegatedCondition(boolean x) {
return (x != false) ? 42 : 43;
}
/// CHECK-START: int Main.SimpleTrueBlock(boolean, int) select_generator (after)
/// CHECK-DAG: <<ParamX:z\d+>> ParameterValue
/// CHECK-DAG: <<ParamY:i\d+>> ParameterValue
/// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
/// CHECK-DAG: <<Const43:i\d+>> IntConstant 43
/// CHECK-DAG: <<Add:i\d+>> Add [<<ParamY>>,<<Const42>>]
/// CHECK-DAG: <<Select:i\d+>> Select [<<Const43>>,<<Add>>,<<ParamX>>]
/// CHECK-DAG: Return [<<Select>>]
/// CHECK-START: int Main.SimpleTrueBlock(boolean, int) select_generator (after)
/// CHECK-NOT: If
public static int SimpleTrueBlock(boolean x, int y) {
return x ? y + 42 : 43;
}
/// CHECK-START: int Main.SimpleFalseBlock(boolean, int) select_generator (after)
/// CHECK-DAG: <<ParamX:z\d+>> ParameterValue
/// CHECK-DAG: <<ParamY:i\d+>> ParameterValue
/// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
/// CHECK-DAG: <<Const43:i\d+>> IntConstant 43
/// CHECK-DAG: <<Add:i\d+>> Add [<<ParamY>>,<<Const43>>]
/// CHECK-DAG: <<Select:i\d+>> Select [<<Add>>,<<Const42>>,<<ParamX>>]
/// CHECK-DAG: Return [<<Select>>]
/// CHECK-START: int Main.SimpleFalseBlock(boolean, int) select_generator (after)
/// CHECK-NOT: If
public static int SimpleFalseBlock(boolean x, int y) {
return x ? 42 : y + 43;
}
/// CHECK-START: int Main.SimpleBothBlocks(boolean, int, int) select_generator (after)
/// CHECK-DAG: <<ParamX:z\d+>> ParameterValue
/// CHECK-DAG: <<ParamY:i\d+>> ParameterValue
/// CHECK-DAG: <<ParamZ:i\d+>> ParameterValue
/// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
/// CHECK-DAG: <<Const43:i\d+>> IntConstant 43
/// CHECK-DAG: <<AddTrue:i\d+>> Add [<<ParamY>>,<<Const42>>]
/// CHECK-DAG: <<AddFalse:i\d+>> Add [<<ParamZ>>,<<Const43>>]
/// CHECK-DAG: <<Select:i\d+>> Select [<<AddFalse>>,<<AddTrue>>,<<ParamX>>]
/// CHECK-DAG: Return [<<Select>>]
/// CHECK-START: int Main.SimpleBothBlocks(boolean, int, int) select_generator (after)
/// CHECK-NOT: If
public static int SimpleBothBlocks(boolean x, int y, int z) {
return x ? y + 42 : z + 43;
}
/// CHECK-START: int Main.ThreeBlocks(boolean, boolean) select_generator (after)
/// CHECK-DAG: <<ParamX:z\d+>> ParameterValue
/// CHECK-DAG: <<ParamY:z\d+>> ParameterValue
/// CHECK-DAG: <<Const1:i\d+>> IntConstant 1
/// CHECK-DAG: <<Const2:i\d+>> IntConstant 2
/// CHECK-DAG: <<Const3:i\d+>> IntConstant 3
/// CHECK-DAG: <<Select23:i\d+>> Select [<<Const3>>,<<Const2>>,<<ParamY>>]
/// CHECK-DAG: <<Select123:i\d+>> Select [<<Select23>>,<<Const1>>,<<ParamX>>]
/// CHECK-DAG: Return [<<Select123>>]
public static int ThreeBlocks(boolean x, boolean y) {
return x ? 1 : (y ? 2 : 3);
}
/// CHECK-START: int Main.MultiplePhis() select_generator (before)
/// CHECK-DAG: <<Const0:i\d+>> IntConstant 0
/// CHECK-DAG: <<Const1:i\d+>> IntConstant 1
/// CHECK-DAG: <<Const13:i\d+>> IntConstant 13
/// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
/// CHECK-DAG: <<PhiX:i\d+>> Phi [<<Const0>>,<<Const13>>,<<Const42>>]
/// CHECK-DAG: <<PhiY:i\d+>> Phi [<<Const1>>,<<Add:i\d+>>,<<Add>>]
/// CHECK-DAG: <<Add>> Add [<<PhiY>>,<<Const1>>]
/// CHECK-DAG: <<Cond:z\d+>> LessThanOrEqual [<<Add>>,<<Const1>>]
/// CHECK-DAG: If [<<Cond>>]
/// CHECK-DAG: Return [<<PhiX>>]
/// CHECK-START: int Main.MultiplePhis() select_generator (after)
/// CHECK-DAG: <<Const0:i\d+>> IntConstant 0
/// CHECK-DAG: <<Const1:i\d+>> IntConstant 1
/// CHECK-DAG: <<Const13:i\d+>> IntConstant 13
/// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
/// CHECK-DAG: <<PhiX:i\d+>> Phi [<<Const0>>,<<Select:i\d+>>]
/// CHECK-DAG: <<PhiY:i\d+>> Phi [<<Const1>>,<<Add:i\d+>>]
/// CHECK-DAG: <<Add>> Add [<<PhiY>>,<<Const1>>]
/// CHECK-DAG: <<Cond:z\d+>> LessThanOrEqual [<<Add>>,<<Const1>>]
/// CHECK-DAG: <<Select>> Select [<<Const13>>,<<Const42>>,<<Cond>>]
/// CHECK-DAG: Return [<<PhiX>>]
public static int MultiplePhis() {
int x = 0;
int y = 1;
while (y++ < 10) {
if (y > 1) {
x = 13;
continue;
} else {
x = 42;
continue;
}
}
return x;
}
/// CHECK-START: int Main.TrueBlockWithTooManyInstructions(boolean) select_generator (before)
/// CHECK-DAG: <<This:l\d+>> ParameterValue
/// CHECK-DAG: <<Cond:z\d+>> ParameterValue
/// CHECK-DAG: <<Const2:i\d+>> IntConstant 2
/// CHECK-DAG: <<Const43:i\d+>> IntConstant 43
/// CHECK-DAG: If [<<Cond>>]
/// CHECK-DAG: <<Iget:i\d+>> InstanceFieldGet [<<This>>]
/// CHECK-DAG: <<Add:i\d+>> Add [<<Iget>>,<<Const2>>]
/// CHECK-DAG: Phi [<<Add>>,<<Const43>>]
/// CHECK-START: int Main.TrueBlockWithTooManyInstructions(boolean) select_generator (after)
/// CHECK-NOT: Select
public int TrueBlockWithTooManyInstructions(boolean x) {
return x ? (read_field + 2) : 43;
}
/// CHECK-START: int Main.FalseBlockWithTooManyInstructions(boolean) select_generator (before)
/// CHECK-DAG: <<This:l\d+>> ParameterValue
/// CHECK-DAG: <<Cond:z\d+>> ParameterValue
/// CHECK-DAG: <<Const3:i\d+>> IntConstant 3
/// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
/// CHECK-DAG: If [<<Cond>>]
/// CHECK-DAG: <<Iget:i\d+>> InstanceFieldGet [<<This>>]
/// CHECK-DAG: <<Add:i\d+>> Add [<<Iget>>,<<Const3>>]
/// CHECK-DAG: Phi [<<Const42>>,<<Add>>]
/// CHECK-START: int Main.FalseBlockWithTooManyInstructions(boolean) select_generator (after)
/// CHECK-NOT: Select
public int FalseBlockWithTooManyInstructions(boolean x) {
return x ? 42 : (read_field + 3);
}
/// CHECK-START: int Main.TrueBlockWithSideEffects(boolean) select_generator (before)
/// CHECK-DAG: <<This:l\d+>> ParameterValue
/// CHECK-DAG: <<Cond:z\d+>> ParameterValue
/// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
/// CHECK-DAG: <<Const43:i\d+>> IntConstant 43
/// CHECK-DAG: If [<<Cond>>]
/// CHECK-DAG: InstanceFieldSet [<<This>>,<<Const42>>]
/// CHECK-DAG: Phi [<<Const42>>,<<Const43>>]
/// CHECK-START: int Main.TrueBlockWithSideEffects(boolean) select_generator (after)
/// CHECK-NOT: Select
public int TrueBlockWithSideEffects(boolean x) {
return x ? (write_field = 42) : 43;
}
/// CHECK-START: int Main.FalseBlockWithSideEffects(boolean) select_generator (before)
/// CHECK-DAG: <<This:l\d+>> ParameterValue
/// CHECK-DAG: <<Cond:z\d+>> ParameterValue
/// CHECK-DAG: <<Const42:i\d+>> IntConstant 42
/// CHECK-DAG: <<Const43:i\d+>> IntConstant 43
/// CHECK-DAG: If [<<Cond>>]
/// CHECK-DAG: InstanceFieldSet [<<This>>,<<Const43>>]
/// CHECK-DAG: Phi [<<Const42>>,<<Const43>>]
/// CHECK-START: int Main.FalseBlockWithSideEffects(boolean) select_generator (after)
/// CHECK-NOT: Select
public int FalseBlockWithSideEffects(boolean x) {
return x ? 42 : (write_field = 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));
assertIntEquals(46, SimpleTrueBlock(true, 4));
assertIntEquals(43, SimpleTrueBlock(false, 4));
assertIntEquals(42, SimpleFalseBlock(true, 7));
assertIntEquals(50, SimpleFalseBlock(false, 7));
assertIntEquals(48, SimpleBothBlocks(true, 6, 2));
assertIntEquals(45, SimpleBothBlocks(false, 6, 2));
assertIntEquals(1, ThreeBlocks(true, true));
assertIntEquals(1, ThreeBlocks(true, false));
assertIntEquals(2, ThreeBlocks(false, true));
assertIntEquals(3, ThreeBlocks(false, false));
assertIntEquals(13, MultiplePhis());
Main m = new Main();
assertIntEquals(42, m.TrueBlockWithTooManyInstructions(true));
assertIntEquals(43, m.TrueBlockWithTooManyInstructions(false));
assertIntEquals(42, m.FalseBlockWithTooManyInstructions(true));
assertIntEquals(43, m.FalseBlockWithTooManyInstructions(false));
assertIntEquals(42, m.TrueBlockWithSideEffects(true));
assertIntEquals(43, m.TrueBlockWithSideEffects(false));
assertIntEquals(42, m.FalseBlockWithSideEffects(true));
assertIntEquals(43, m.FalseBlockWithSideEffects(false));
}
// These need to be instance fields so as to not generate a LoadClass for iget/iput.
public int read_field = 40;
public int write_field = 42;
}