mirror of
https://github.com/JGRennison/OpenTTD-patches.git
synced 2024-11-11 13:10:45 +00:00
77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/* $Id$ */
|
|
|
|
/*
|
|
* This file is part of OpenTTD.
|
|
* OpenTTD 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, version 2.
|
|
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/** @file os_timer.cpp OS/compiler dependant real time tick sampling. */
|
|
|
|
#include "stdafx.h"
|
|
|
|
#undef RDTSC_AVAILABLE
|
|
|
|
/* rdtsc for MSC_VER, uses simple inline assembly, or _rdtsc
|
|
* from external win64.asm because VS2005 does not support inline assembly */
|
|
#if defined(_MSC_VER) && !defined(RDTSC_AVAILABLE) && !defined(WINCE)
|
|
#include <intrin.h>
|
|
uint64 ottd_rdtsc()
|
|
{
|
|
return __rdtsc();
|
|
}
|
|
#define RDTSC_AVAILABLE
|
|
#endif
|
|
|
|
/* rdtsc for OS/2. Hopefully this works, who knows */
|
|
#if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE)
|
|
unsigned __int64 ottd_rdtsc();
|
|
# pragma aux ottd_rdtsc = 0x0F 0x31 value [edx eax] parm nomemory modify exact [edx eax] nomemory;
|
|
# define RDTSC_AVAILABLE
|
|
#endif
|
|
|
|
/* rdtsc for all other *nix-en (hopefully). Use GCC syntax */
|
|
#if (defined(__i386__) || defined(__x86_64__)) && !defined(__DJGPP__) && !defined(RDTSC_AVAILABLE)
|
|
uint64 ottd_rdtsc()
|
|
{
|
|
uint32 high, low;
|
|
__asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high));
|
|
return ((uint64)high << 32) | low;
|
|
}
|
|
# define RDTSC_AVAILABLE
|
|
#endif
|
|
|
|
/* rdtsc for PPC which has this not */
|
|
#if (defined(__POWERPC__) || defined(__powerpc__)) && !defined(RDTSC_AVAILABLE)
|
|
uint64 ottd_rdtsc()
|
|
{
|
|
uint32 high = 0, high2 = 0, low;
|
|
/* PPC does not have rdtsc, so we cheat by reading the two 32-bit time-counters
|
|
* it has, 'Move From Time Base (Upper)'. Since these are two reads, in the
|
|
* very unlikely event that the lower part overflows to the upper part while we
|
|
* read it; we double-check and reread the registers */
|
|
asm volatile (
|
|
"mftbu %0\n"
|
|
"mftb %1\n"
|
|
"mftbu %2\n"
|
|
"cmpw %3,%4\n"
|
|
"bne- $-16\n"
|
|
: "=r" (high), "=r" (low), "=r" (high2)
|
|
: "0" (high), "2" (high2)
|
|
);
|
|
return ((uint64)high << 32) | low;
|
|
}
|
|
# define RDTSC_AVAILABLE
|
|
#endif
|
|
|
|
/* In all other cases we have no support for rdtsc. No major issue,
|
|
* you just won't be able to profile your code with TIC()/TOC() */
|
|
#if !defined(RDTSC_AVAILABLE)
|
|
/* MSVC (in case of WinCE) can't handle #warning */
|
|
# if !defined(_MSC_VER)
|
|
#warning "(non-fatal) No support for rdtsc(), you won't be able to profile with TIC/TOC"
|
|
# endif
|
|
uint64 ottd_rdtsc() {return 0;}
|
|
#endif
|