os_timer.cpp
Go to the documentation of this file.00001
00002
00005 #include "stdafx.h"
00006
00007 #undef RDTSC_AVAILABLE
00008
00009
00010
00011 #if defined(_MSC_VER) && !defined(RDTSC_AVAILABLE) && !defined(WINCE)
00012 # if _MSC_VER >= 1400
00013 #include <intrin.h>
00014 uint64 _rdtsc()
00015 {
00016 return __rdtsc();
00017 }
00018 # else
00019 uint64 _declspec(naked) _rdtsc()
00020 {
00021 _asm {
00022 rdtsc
00023 ret
00024 }
00025 }
00026 # endif
00027 # define RDTSC_AVAILABLE
00028 #endif
00029
00030
00031 #if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE)
00032 unsigned __int64 _rdtsc();
00033 # pragma aux _rdtsc = 0x0F 0x31 value [edx eax] parm nomemory modify exact [edx eax] nomemory;
00034 # define RDTSC_AVAILABLE
00035 #endif
00036
00037
00038 #if defined(__i386__) || defined(__x86_64__) && !defined(RDTSC_AVAILABLE)
00039 uint64 _rdtsc()
00040 {
00041 uint32 high, low;
00042 __asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high));
00043 return ((uint64)high << 32) | low;
00044 }
00045 # define RDTSC_AVAILABLE
00046 #endif
00047
00048
00049 #if (defined(__POWERPC__) || defined(__powerpc__)) && !defined(RDTSC_AVAILABLE)
00050 uint64 _rdtsc()
00051 {
00052 uint32 high = 0, high2 = 0, low;
00053
00054
00055
00056
00057 asm volatile (
00058 "mftbu %0\n"
00059 "mftb %1\n"
00060 "mftbu %2\n"
00061 "cmpw %3,%4\n"
00062 "bne- $-16\n"
00063 : "=r" (high), "=r" (low), "=r" (high2)
00064 : "0" (high), "2" (high2)
00065 );
00066 return ((uint64)high << 32) | low;
00067 }
00068 # define RDTSC_AVAILABLE
00069 #endif
00070
00071
00072
00073 #if !defined(RDTSC_AVAILABLE)
00074
00075 # if !defined(_MSC_VER)
00076 #warning "(non-fatal) No support for rdtsc(), you won't be able to profile with TIC/TOC"
00077 # endif
00078 uint64 _rdtsc() {return 0;}
00079 #endif