GetCPUTime.h

// Copyright (C) 2009,2010,2011,2012 GlavSoft LLC.
// All rights reserved.
//
//-------------------------------------------------------------------------
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//
//                       http://www.t i g h t v n c.com/
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, w_rite to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//-------------------------------------------------------------------------
//
 
//#ifndef _GETCPUTIME_H_
//#define _GETCPUTIME_H_
#pragma once
 
// returns current process time of work in seconds
::f64 getCPUTime();
 
// returns kernel time of work in seconds
::f64 getKernelTime();
 
// returns current processor tick number
inline ::u64 rdtsc() {
  ::u32 lo, hi;
#ifdef __GNUC__
 
#if defined(__aarch64__)
 
  uint64_t val;
  asm volatile("mrs %0, cntvct_el0" : "=r"(val));
  return val;
 
#else
  asm  volatile ("rdtsc\n" : "=a" (lo), "=d" (hi));
 
#endif
 
#elif _MSC_VER
#ifdef _M_IX86
  __asm
  {
    rdtsc
    mov DWORD PTR [lo], eax
    mov DWORD PTR [hi], edx
  }
#else
  return 0;
#endif
#else
  #error "Unsupported compiler"
#endif
  return ((::u64)hi << 32) | lo;
}
 
//#endif _GETCPUTIME_H_