/*
* Copyright ( c ) 2011 , 2019 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* This code is free software ; you can redistribute it and / or modify it
* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
*
* Please contact Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA
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*/
#ifndef OS_CPU_LINUX_X86_OS_LINUX_X86_INLINE_HPP
#define OS_CPU_LINUX_X86_OS_LINUX_X86_INLINE_HPP
#include "runtime/os.hpp"
// See http://www.technovelty.org/code/c/reading-rdtsc.htl for details
inline jlong os::rdtsc() {
#ifndef AMD64
// 64 bit result in edx:eax
uint64_t res;
__asm__ __volatile__ (
"rdtsc" :
"=A" (res));
return (jlong)res;
#else
uint64_t res;
uint32_t ts1, ts2;
__asm__ __volatile__ (
"rdtsc" :
"=a" (ts1),
"=d" (ts2));
res = ((uint64_t)ts1 | (uint64_t)ts2 <<
32 );
return (jlong)res;
#endif // AMD64
}
#endif // OS_CPU_LINUX_X86_OS_LINUX_X86_INLINE_HPP
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