Mercurial > hg > truffle
comparison src/os_cpu/linux_x86/vm/os_linux_x86.inline.hpp @ 4749:7ab5f6318694
7125934: Add a fast unordered timestamp capability to Hotspot on x86/x64
Summary: Add rdtsc detection and inline generation.
Reviewed-by: kamg, dholmes
Contributed-by: karen.kinnear@oracle.com
author | phh |
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date | Sun, 01 Jan 2012 11:17:59 -0500 |
parents | |
children | b9a9ed0f8eeb |
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4732:4ec93d767458 | 4749:7ab5f6318694 |
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1 /* | |
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP | |
26 #define OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP | |
27 | |
28 #include "runtime/os.hpp" | |
29 | |
30 // See http://www.technovelty.org/code/c/reading-rdtsc.htl for details | |
31 inline jlong os::rdtsc() { | |
32 #ifndef AMD64 | |
33 // 64 bit result in edx:eax | |
34 uint64_t res; | |
35 __asm__ __volatile__ ("rdtsc" : "=A" (res)); | |
36 return (jlong)res; | |
37 #else | |
38 uint64_t res; | |
39 uint32_t ts1, ts2; | |
40 __asm__ __volatile__ ("rdtsc" : "=a" (ts1), "=d" (ts2)); | |
41 res = ((uint64_t)ts1 | (uint64_t)ts2 << 32); | |
42 return (jlong)res; | |
43 #endif // AMD64 | |
44 } | |
45 | |
46 #endif // OS_CPU_LINUX_X86_VM_OS_LINUX_X86_INLINE_HPP |