Mercurial > hg > truffle
view test/compiler/6695810/Test.java @ 219:ab65a4c9b2e8
6708714: Optimize long LShift on 32-bits x86
Summary: For small (1-3 bits) left long shifts in 32-bits VM use sets of add+addc instructions instead of shld+shl on new AMD cpus.
Reviewed-by: never
Contributed-by: shrinivas.joshi@amd.com
author | kvn |
---|---|
date | Mon, 23 Jun 2008 14:11:12 -0700 |
parents | 885ed790ecf0 |
children | b0fe4deeb9fb 51ae48d8072f |
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/* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * * * * * * * * * * * * * * * * * * * */ /* * @test * @bug 6695810 * @summary null oop passed to encode_heap_oop_not_null * @run main/othervm -Xbatch Test */ public class Test { Test _t; static void test(Test t1, Test t2) { if (t2 != null) t1._t = t2; if (t2 != null) t1._t = t2; } public static void main(String[] args) { Test t = new Test(); for (int i = 0; i < 50; i++) { for (int j = 0; j < 100; j++) { test(t, t); } test(t, null); } for (int i = 0; i < 10000; i++) { test(t, t); } test(t, null); } }