147 lines
3.9 KiB
C
147 lines
3.9 KiB
C
/*
|
|
* This program source code file is part of KiCad, a free EDA CAD application.
|
|
*
|
|
* Copyright (C) 2013 CERN
|
|
* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
|
|
*
|
|
* 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, you may find one here:
|
|
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
|
|
* or you may search the http://www.gnu.org website for the version 2 license,
|
|
* or you may write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|
|
*/
|
|
|
|
/**
|
|
* @file profile.h:
|
|
* @brief Simple profiling functions for measuring code execution time.
|
|
*/
|
|
|
|
#ifndef __PROFILE_H
|
|
#define __PROFILE_H
|
|
|
|
#include <sys/time.h>
|
|
#include <stdint.h>
|
|
|
|
/**
|
|
* Function rdtsc
|
|
* Returns processor's time-stamp counter. Main purpose is precise time measuring of code
|
|
* execution time.
|
|
* @return unsigned long long - Value of time-stamp counter.
|
|
*/
|
|
#if defined(__i386__)
|
|
static __inline__ unsigned long long rdtsc()
|
|
{
|
|
unsigned long long int x;
|
|
__asm__ volatile ( ".byte 0x0f, 0x31" : "=A" ( x ) );
|
|
|
|
return x;
|
|
}
|
|
|
|
|
|
#elif defined(__x86_64__)
|
|
static __inline__ unsigned long long rdtsc()
|
|
{
|
|
unsigned hi, lo;
|
|
__asm__ __volatile__ ( "rdtsc" : "=a" ( lo ), "=d" ( hi ) );
|
|
|
|
return ( (unsigned long long) lo ) | ( ( (unsigned long long) hi ) << 32 );
|
|
}
|
|
|
|
|
|
#elif defined(__powerpc__)
|
|
static __inline__ unsigned long long rdtsc()
|
|
{
|
|
unsigned long long int result = 0;
|
|
unsigned long int upper, lower, tmp;
|
|
__asm__ volatile (
|
|
"0: \n"
|
|
"\tmftbu %0 \n"
|
|
"\tmftb %1 \n"
|
|
"\tmftbu %2 \n"
|
|
"\tcmpw %2,%0 \n"
|
|
"\tbne 0b \n"
|
|
: "=r" ( upper ), "=r" ( lower ), "=r" ( tmp )
|
|
);
|
|
|
|
result = upper;
|
|
result = result << 32;
|
|
result = result | lower;
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
#endif /* __powerpc__ */
|
|
|
|
// Fixme: OS X version
|
|
/**
|
|
* Function get_tics
|
|
* Returns the number of microseconds that have elapsed since the system was started.
|
|
* @return uint64_t Number of microseconds.
|
|
*/
|
|
static inline uint64_t get_tics()
|
|
{
|
|
struct timeval tv;
|
|
gettimeofday( &tv, NULL );
|
|
|
|
return (uint64_t) tv.tv_sec * 1000000ULL + (uint64_t) tv.tv_usec;
|
|
#endif
|
|
}
|
|
|
|
|
|
/**
|
|
* Structure for storing data related to profiling counters.
|
|
*/
|
|
struct prof_counter
|
|
{
|
|
uint64_t value; /// Stored timer value
|
|
bool use_rdtsc; /// Method of time measuring (rdtsc or tics)
|
|
};
|
|
|
|
/**
|
|
* Function prof_start
|
|
* Begins code execution time counting for a given profiling counter.
|
|
* @param cnt is the counter which should be started.
|
|
* @param use_rdtsc tells if processor's time-stamp counter should be used for time counting.
|
|
* Otherwise is system tics method will be used. IMPORTANT: time-stamp counter should not
|
|
* be used on multicore machines executing threaded code.
|
|
*/
|
|
static inline void prof_start( prof_counter* cnt, bool use_rdtsc )
|
|
{
|
|
cnt->use_rdtsc = use_rdtsc;
|
|
|
|
if( use_rdtsc )
|
|
{
|
|
cnt->value = rdtsc();
|
|
}
|
|
else
|
|
{
|
|
cnt->value = get_tics();
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Function prof_stop
|
|
* Ends code execution time counting for a given profiling counter.
|
|
* @param cnt is the counter which should be stopped.
|
|
*/
|
|
static inline void prof_end( prof_counter* cnt )
|
|
{
|
|
if( cnt->use_rdtsc )
|
|
cnt->value = rdtsc() - cnt->value;
|
|
else
|
|
cnt->value = get_tics() - cnt->value;
|
|
}
|