Mercurial > hg > graal-compiler
view test/compiler/6663621/IVTest.java @ 145:f3de1255b035
6603011: RFE: Optimize long division
Summary: Transform long division by constant into multiply
Reviewed-by: never, kvn
author | rasbold |
---|---|
date | Wed, 07 May 2008 08:06:46 -0700 |
parents | f705f25597eb |
children | 2a8ec427fbe1 |
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/* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * * * * * * * * * * * * * * * * * * */ /** * @test * @bug 6663621 * @summary JVM crashes while trying to execute api/java_security/Signature/SignatureTests.html#initSign tests. */ public class IVTest { static int paddedSize; static void padV15(byte[] padded) { int psSize = padded.length; int k = 0; while (psSize-- > 0) { padded[k++] = (byte)0xff; } } static void padV15_2(int paddedSize) { byte[] padded = new byte[paddedSize]; int psSize = padded.length; int k = 0; while (psSize-- > 0) { padded[k++] = (byte)0xff; } } static void padV15_3() { byte[] padded = new byte[paddedSize]; int psSize = padded.length; int k = 0; while (psSize-- > 0) { padded[k++] = (byte)0xff; } } static void padV15_4() { byte[] padded = new byte[paddedSize]; int psSize = padded.length; for (int k = 0;psSize > 0; psSize--) { int i = padded.length - psSize; padded[i] = (byte)0xff; } } static void padV15_5() { byte[] padded = new byte[paddedSize]; int psSize = padded.length; int k = psSize - 1; for (int i = 0; i < psSize; i++) { padded[k--] = (byte)0xff; } } public static void main(String argv[]) { int bounds = 1024; int lim = 500000; long start = System.currentTimeMillis(); for (int j = 0; j < lim; j++) { paddedSize = j % bounds; padV15(new byte[paddedSize]); } long end = System.currentTimeMillis(); System.out.println(end - start); start = System.currentTimeMillis(); for (int j = 0; j < lim; j++) { paddedSize = j % bounds; padV15_2(paddedSize); } end = System.currentTimeMillis(); System.out.println(end - start); start = System.currentTimeMillis(); for (int j = 0; j < lim; j++) { paddedSize = j % bounds; padV15_3(); } end = System.currentTimeMillis(); System.out.println(end - start); start = System.currentTimeMillis(); for (int j = 0; j < lim; j++) { paddedSize = j % bounds; padV15_4(); } end = System.currentTimeMillis(); System.out.println(end - start); start = System.currentTimeMillis(); for (int j = 0; j < lim; j++) { paddedSize = j % bounds; padV15_5(); } end = System.currentTimeMillis(); System.out.println(end - start); } }