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1 /* $Id$ */ |
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2 |
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3 #include "stdafx.h" |
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4 |
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5 #undef RDTSC_AVAILABLE |
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6 |
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7 /* rdtsc for MSC_VER, uses simple inline assembly, or _rdtsc |
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8 * from external win64.asm because VS2005 does not support inline assembly */ |
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9 #if defined(_MSC_VER) && !defined(RDTSC_AVAILABLE) |
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10 # if defined (_M_AMD64) |
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11 extern uint64 _rdtsc(void); |
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12 # else |
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13 uint64 _declspec(naked) _rdtsc(void) |
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14 { |
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15 _asm { |
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16 rdtsc |
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17 ret |
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18 } |
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19 } |
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20 # endif |
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21 # define RDTSC_AVAILABLE |
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22 #endif |
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23 |
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24 /* rdtsc for OS/2. Hopefully this works, who knows */ |
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25 #if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE) |
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26 unsigned __int64 _rdtsc( void); |
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27 # pragma aux _rdtsc = 0x0F 0x31 value [edx eax] parm nomemory modify exact [edx eax] nomemory; |
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28 # define RDTSC_AVAILABLE |
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29 #endif |
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30 |
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31 /* rdtsc for all other *nix-en (hopefully). Use GCC syntax */ |
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32 #if defined(__i386__) || defined(__x86_64__) && !defined(RDTSC_AVAILABLE) |
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33 uint64 _rdtsc(void) |
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34 { |
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35 uint32 high, low; |
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36 __asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high)); |
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37 return ((uint64)high << 32) | low; |
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38 } |
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39 # define RDTSC_AVAILABLE |
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40 #endif |
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41 |
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42 /* rdtsc for PPC which has this not */ |
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43 #if (defined(__POWERPC__) || defined(__powerpc__)) && !defined(RDTSC_AVAILABLE) |
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44 uint64 _rdtsc(void) |
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45 { |
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46 uint32 high = 0, high2 = 0, low; |
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47 /* PPC does not have rdtsc, so we cheat by reading the two 32-bit time-counters |
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48 * it has, 'Move From Time Base (Upper)'. Since these are two reads, in the |
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49 * very unlikely event that the lower part overflows to the upper part while we |
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50 * read it; we double-check and reread the registers */ |
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51 asm volatile ( |
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52 "mftbu %0\n" |
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53 "mftb %1\n" |
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54 "mftbu %2\n" |
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55 "cmpw %3,%4\n" |
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56 "bne- $-16\n" |
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57 : "=r" (high), "=r" (low), "=r" (high2) |
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58 : "0" (high), "2" (high2) |
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59 ); |
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60 return ((uint64)high << 32) | low; |
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61 } |
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62 # define RDTSC_AVAILABLE |
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63 #endif |
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64 |
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65 /* In all other cases we have no support for rdtsc. No major issue, |
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66 * you just won't be able to profile your code with TIC()/TOC() */ |
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67 #if !defined(RDTSC_AVAILABLE) |
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68 #warning "(non-fatal) No support for rdtsc(), you won't be able to profile with TIC/TOC" |
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69 uint64 _rdtsc(void) {return 0;} |
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70 #endif |