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84 lines
2.9 KiB
84 lines
2.9 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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public class Main {
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public static void main(String args[]) {
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doFloatingPointTest("1", "1.0");
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doFloatingPointTest("4", "2.0");
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checkValue(String.valueOf(doIntegerTest1(4)), "0");
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checkValue(String.valueOf(doIntegerTest2(4)), "4");
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// Another variant of the floating point test, but less brittle.
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staticField = 1;
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checkValue(String.valueOf($noinline$test()), "1.0");
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staticField = 4;
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checkValue(String.valueOf($noinline$test()), "2.0");
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}
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// This code is a reduced version of the original reproducer. The arm
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// code generator used to generate wrong code for it. Note that this
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// test is very brittle and a simple change in it could cause the compiler
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// to not trip.
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public static void doFloatingPointTest(String s, String expected) {
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float a = (float)Integer.valueOf(s);
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a = a < 2.0f ? a : 2.0f;
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checkValue("" + a, expected);
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}
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// The compiler used to trip on the two following methods. The test there
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// is very brittle and requires not running constant folding after
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// load/store elimination.
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public static int doIntegerTest1(int param) {
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Main main = new Main();
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main.field = 0;
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return (main.field == 0) ? 0 : param;
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}
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public static int doIntegerTest2(int param) {
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Main main = new Main();
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main.field = 0;
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return (main.field != 0) ? 0 : param;
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}
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public static void checkValue(String actual, String expected) {
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if (!expected.equals(actual)) {
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throw new Error("Expected " + expected + ", got " + actual);
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}
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}
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static void $noinline$nothing() {}
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static int $noinline$getField() { return staticField; }
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static float $noinline$test() {
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// The 2.0f shall be materialized for GreaterThanOrEqual at the beginning of the method;
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// since the following call clobbers caller-saves, it is allocated to s16.
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// r0(field) = InvokeStaticOrDirect[]
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int one = $noinline$getField();
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// s0(a_1) = TypeConversion[r0(one)]
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float a = (float)one;
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// s16(a_2) = Select[s0(a_1), C(2.0f), GreaterThanOrEqual[s0(a_1), s16(2.0f)]]
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a = a < 2.0f ? a : 2.0f;
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// The following call is added to clobber caller-saves, forcing the output of the Select
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// to be allocated to s16.
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$noinline$nothing();
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return a;
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}
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int field;
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static int staticField;
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}
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