/* $Id$ */ /** @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) # if _MSC_VER >= 1400 #include <intrin.h> uint64 _rdtsc() { return __rdtsc(); } # else uint64 _declspec(naked) _rdtsc() { _asm { rdtsc ret } } # endif # define RDTSC_AVAILABLE #endif /* rdtsc for OS/2. Hopefully this works, who knows */ #if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE) unsigned __int64 _rdtsc(); # pragma aux _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(RDTSC_AVAILABLE) uint64 _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 _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 _rdtsc() {return 0;} #endif