92 lines
3.4 KiB
Java
92 lines
3.4 KiB
Java
/*
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* Copyright (c) 2022, 2023, 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 8289551
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* @requires (os.arch != "x86" & os.arch != "i386") | vm.opt.UseSSE == "null" | vm.opt.UseSSE > 0
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* @summary Verify NaN sign and significand bits are preserved across conversions
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* @run main/othervm -XX:+UnlockDiagnosticVMOptions
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* -XX:DisableIntrinsic=_float16ToFloat,_floatToFloat16 Binary16ConversionNaN
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*/
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/*
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* The behavior tested below is an implementation property not
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* required by the specification. It would be acceptable for this
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* information to not be preserved (as long as a NaN is returned) if,
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* say, a intrinsified version using native hardware instructions
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* behaved differently.
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*
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* If that is the case, this test should be modified to disable
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* intrinsics or to otherwise not run on platforms with an differently
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* behaving intrinsic.
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*/
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public class Binary16ConversionNaN {
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public static void main(String... argv) {
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int errors = 0;
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errors += binary16NaNRoundTrip();
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if (errors > 0)
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throw new RuntimeException(errors + " errors");
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}
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/*
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* Put all 16-bit NaN values through a conversion loop and make
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* sure the significand, sign, and exponent are all preserved.
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*/
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private static int binary16NaNRoundTrip() {
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int errors = 0;
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final int NAN_EXPONENT = 0x7c00;
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final int SIGN_BIT = 0x8000;
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// A NaN has a nonzero significand
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for (int i = 1; i <= 0x3ff; i++) {
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short binary16NaN = (short)(NAN_EXPONENT | i);
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assert isNaN(binary16NaN);
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errors += testRoundTrip( binary16NaN);
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errors += testRoundTrip((short)(SIGN_BIT | binary16NaN));
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}
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return errors;
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}
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private static boolean isNaN(short binary16) {
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return ((binary16 & 0x7c00) == 0x7c00) // Max exponent and...
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&& ((binary16 & 0x03ff) != 0 ); // significand nonzero.
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}
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private static int testRoundTrip(int i) {
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int errors = 0;
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short s = (short)i;
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float f = Float.float16ToFloat(s);
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short s2 = Float.floatToFloat16(f);
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if (s != s2) {
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errors++;
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System.out.println("Roundtrip failure on NaN value " +
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Integer.toHexString(0xFFFF & (int)s) +
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"\t got back " + Integer.toHexString(0xFFFF & (int)s2));
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}
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return errors;
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}
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}
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