173 lines
6.7 KiB
Java
173 lines
6.7 KiB
Java
/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8073670
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* @summary Test that causes C2 to fold two NaNs with different values into a single NaN.
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*
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* @run main/othervm -XX:-TieredCompilation -Xcomp
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* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_inf
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* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_zero
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* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_nan
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* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_inf
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* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_zero
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* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_nan
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* compiler.c2.FloatingPointFoldingTest
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*/
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package compiler.c2;
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public class FloatingPointFoldingTest {
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// Double values.
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public static final long MINUS_INF_LONGBITS = 0xfff0000000000000L;
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public static final double DOUBLE_MINUS_INF = Double.longBitsToDouble(MINUS_INF_LONGBITS);
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public static final long PLUS_INF_LONGBITS = 0x7ff0000000000000L;
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public static final double DOUBLE_PLUS_INF = Double.longBitsToDouble(PLUS_INF_LONGBITS);
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public static final long MINUS_ZERO_LONGBITS = 0x8000000000000000L;
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public static final double DOUBLE_MINUS_ZERO = Double.longBitsToDouble(MINUS_ZERO_LONGBITS);
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// We need two different NaN values. A floating point number is
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// considered to be NaN is the sign bit is 0, all exponent bits
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// are set to 1, and at least one bit of the exponent is not zero.
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//
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// As java.lang.Double.NaN is 0x7ff8000000000000L, we use
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// 0x7ffc000000000000L as a second NaN double value.
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public static final long NAN_LONGBITS = 0x7ffc000000000000L;
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public static final double DOUBLE_NAN = Double.longBitsToDouble(NAN_LONGBITS);
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// Float values.
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public static final int MINUS_INF_INTBITS = 0xff800000;
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public static final float FLOAT_MINUS_INF = Float.intBitsToFloat(MINUS_INF_INTBITS);
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public static final int PLUS_INF_INTBITS = 0x7f800000;
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public static final float FLOAT_PLUS_INF = Float.intBitsToFloat(PLUS_INF_INTBITS);
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public static final int MINUS_ZERO_INTBITS = 0x80000000;
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public static final float FLOAT_MINUS_ZERO = Float.intBitsToFloat(MINUS_ZERO_INTBITS);
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// As java.lang.Float.NaN is 0x7fc00000, we use 0x7fe00000
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// as a second NaN float value.
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public static final int NAN_INTBITS = 0x7fe00000;
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public static final float FLOAT_NAN = Float.intBitsToFloat(NAN_INTBITS);
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// Double tests.
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static void test_double_inf(long[] result) {
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double d1 = DOUBLE_MINUS_INF;
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double d2 = DOUBLE_PLUS_INF;
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result[0] = Double.doubleToRawLongBits(d1);
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result[1] = Double.doubleToRawLongBits(d2);
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}
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static void test_double_zero(long[] result) {
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double d1 = DOUBLE_MINUS_ZERO;
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double d2 = 0;
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result[0] = Double.doubleToRawLongBits(d1);
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result[1] = Double.doubleToRawLongBits(d2);
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}
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static void test_double_nan(long[] result) {
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double d1 = DOUBLE_NAN;
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double d2 = Double.NaN;
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result[0] = Double.doubleToRawLongBits(d1);
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result[1] = Double.doubleToRawLongBits(d2);
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}
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// Float tests.
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static void test_float_inf(int[] result) {
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float f1 = FLOAT_MINUS_INF;
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float f2 = FLOAT_PLUS_INF;
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result[0] = Float.floatToRawIntBits(f1);
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result[1] = Float.floatToRawIntBits(f2);
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}
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static void test_float_zero(int[] result) {
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float f1 = FLOAT_MINUS_ZERO;
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float f2 = 0;
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result[0] = Float.floatToRawIntBits(f1);
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result[1] = Float.floatToRawIntBits(f2);
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}
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static void test_float_nan(int[] result) {
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float f1 = FLOAT_NAN;
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float f2 = Float.NaN;
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result[0] = Float.floatToRawIntBits(f1);
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result[1] = Float.floatToRawIntBits(f2);
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}
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// Check doubles.
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static void check_double(long[] result, double d1, double d2) {
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if (result[0] == result[1]) {
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throw new RuntimeException("ERROR: Two different double values are considered equal. \n"
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+ String.format("\toriginal values: 0x%x 0x%x\n", Double.doubleToRawLongBits(d1), Double.doubleToRawLongBits(d2))
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+ String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1]));
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}
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}
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// Check floats.
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static void check_float(int[] result, float f1, float f2) {
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if (result[0] == result[1]) {
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throw new RuntimeException("ERROR: Two different float values are considered equal. \n"
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+ String.format("\toriginal values: 0x%x 0x%x\n", Float.floatToRawIntBits(f1), Float.floatToRawIntBits(f2))
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+ String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1]));
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}
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}
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public static void main(String[] args) {
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// Float tests.
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int[] iresult = new int[2];
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// -Inf and +Inf.
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test_float_inf(iresult);
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check_float(iresult, FLOAT_MINUS_INF, FLOAT_PLUS_INF);
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// 0 and -0.
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test_float_zero(iresult);
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check_float(iresult, FLOAT_MINUS_ZERO, 0);
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// Diferrent NaNs.
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test_float_nan(iresult);
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check_float(iresult, FLOAT_NAN, Float.NaN);
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// Double tests.
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long[] lresult = new long[2];
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// -Inf and +Inf.
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test_double_inf(lresult);
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check_double(lresult, DOUBLE_MINUS_INF, DOUBLE_PLUS_INF);
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// 0 and -0.
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test_double_zero(lresult);
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check_double(lresult, DOUBLE_MINUS_ZERO, 0);
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// Diferrent NaNs.
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test_double_nan(lresult);
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check_double(lresult, DOUBLE_NAN, Double.NaN);
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}
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}
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