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test/compiler/loopopts/ConstFPVectorization.java@aefa2e84b424 (annotated)

test/compiler/loopopts/ConstFPVectorization.java

Thu, 19 Mar 2015 19:53:34 +0100

author

zmajo

date

Thu, 19 Mar 2015 19:53:34 +0100

changeset 7638

aefa2e84b424

permissions

-rw-r--r--

8074869: C2 code generator can replace -0.0f with +0.0f on Linux
Summary: Instead of 'fpclass', use cast float->int and double->long to check if value is +0.0f and +0.0d, respectively.
Reviewed-by: kvn, simonis, dlong

zmajo@7638	1	/*
zmajo@7638	2	* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
zmajo@7638	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
zmajo@7638	4	*
zmajo@7638	5	* This code is free software; you can redistribute it and/or modify it
zmajo@7638	6	* under the terms of the GNU General Public License version 2 only, as
zmajo@7638	7	* published by the Free Software Foundation.
zmajo@7638	8	*
zmajo@7638	9	* This code is distributed in the hope that it will be useful, but WITHOUT
zmajo@7638	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
zmajo@7638	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
zmajo@7638	12	* version 2 for more details (a copy is included in the LICENSE file that
zmajo@7638	13	* accompanied this code).
zmajo@7638	14	*
zmajo@7638	15	* You should have received a copy of the GNU General Public License version
zmajo@7638	16	* 2 along with this work; if not, write to the Free Software Foundation,
zmajo@7638	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
zmajo@7638	18	*
zmajo@7638	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
zmajo@7638	20	* or visit www.oracle.com if you need additional information or have any
zmajo@7638	21	* questions.
zmajo@7638	22	*
zmajo@7638	23	*/
zmajo@7638	24
zmajo@7638	25	/**
zmajo@7638	26	* @test
zmajo@7638	27	* @bug 8074869
zmajo@7638	28	* @summary C2 code generator can replace -0.0f with +0.0f on Linux
zmajo@7638	29	* @run main ConstFPVectorization 8
zmajo@7638	30	* @author volker.simonis@gmail.com
zmajo@7638	31	*
zmajo@7638	32	*/
zmajo@7638	33
zmajo@7638	34	public class ConstFPVectorization {
zmajo@7638	35
zmajo@7638	36	static float[] f = new float[16];
zmajo@7638	37	static double[] d = new double[16];
zmajo@7638	38
zmajo@7638	39	static void floatLoop(int count) {
zmajo@7638	40	for (int i = 0; i < count; i++) {
zmajo@7638	41	f[i] = -0.0f;
zmajo@7638	42	}
zmajo@7638	43	}
zmajo@7638	44
zmajo@7638	45	static void doubleLoop(int count) {
zmajo@7638	46	for (int i = 0; i < count; i++) {
zmajo@7638	47	d[i] = -0.0d;
zmajo@7638	48	}
zmajo@7638	49	}
zmajo@7638	50
zmajo@7638	51	public static void main(String args[]) {
zmajo@7638	52	for (int i = 0; i < 10_000; i++) {
zmajo@7638	53	floatLoop(Integer.parseInt(args[0]));
zmajo@7638	54	doubleLoop(Integer.parseInt(args[0]));
zmajo@7638	55	}
zmajo@7638	56	for (int i = 0; i < Integer.parseInt(args[0]); i++) {
zmajo@7638	57	if (Float.floatToRawIntBits(f[i]) != Float.floatToRawIntBits(-0.0f))
zmajo@7638	58	throw new Error("Float error at index " + i);
zmajo@7638	59	if (Double.doubleToRawLongBits(d[i]) != Double.doubleToRawLongBits(-0.0d))
zmajo@7638	60	throw new Error("Double error at index " + i);
zmajo@7638	61	}
zmajo@7638	62	}
zmajo@7638	63	}