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1 /* |
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2 ** 2008 May 27 |
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3 ** |
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4 ** The author disclaims copyright to this source code. In place of |
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5 ** a legal notice, here is a blessing: |
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6 ** |
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7 ** May you do good and not evil. |
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8 ** May you find forgiveness for yourself and forgive others. |
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9 ** May you share freely, never taking more than you give. |
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10 ** |
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11 ****************************************************************************** |
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12 ** |
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13 ** This file contains inline asm code for retrieving "high-performance" |
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14 ** counters for x86 class CPUs. |
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15 ** |
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16 ** $Id: hwtime.h,v 1.3 2008/08/01 14:33:15 shane Exp $ |
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17 */ |
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18 #ifndef _HWTIME_H_ |
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19 #define _HWTIME_H_ |
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20 |
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21 /* |
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22 ** The following routine only works on pentium-class (or newer) processors. |
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23 ** It uses the RDTSC opcode to read the cycle count value out of the |
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24 ** processor and returns that value. This can be used for high-res |
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25 ** profiling. |
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26 */ |
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27 #if (defined(__GNUC__) || defined(_MSC_VER)) && \ |
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28 (defined(i386) || defined(__i386__) || defined(_M_IX86)) |
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29 |
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30 #if defined(__GNUC__) |
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31 |
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32 __inline__ sqlite_uint64 sqlite3Hwtime(void){ |
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33 unsigned int lo, hi; |
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34 __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi)); |
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35 return (sqlite_uint64)hi << 32 | lo; |
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36 } |
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37 |
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38 #elif defined(_MSC_VER) |
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39 |
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40 __declspec(naked) __inline sqlite_uint64 __cdecl sqlite3Hwtime(void){ |
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41 __asm { |
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42 rdtsc |
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43 ret ; return value at EDX:EAX |
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44 } |
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45 } |
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46 |
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47 #endif |
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48 |
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49 #elif (defined(__GNUC__) && defined(__x86_64__)) |
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50 |
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51 __inline__ sqlite_uint64 sqlite3Hwtime(void){ |
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52 unsigned long val; |
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53 __asm__ __volatile__ ("rdtsc" : "=A" (val)); |
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54 return val; |
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55 } |
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56 |
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57 #elif (defined(__GNUC__) && defined(__ppc__)) |
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58 |
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59 __inline__ sqlite_uint64 sqlite3Hwtime(void){ |
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60 unsigned long long retval; |
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61 unsigned long junk; |
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62 __asm__ __volatile__ ("\n\ |
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63 1: mftbu %1\n\ |
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64 mftb %L0\n\ |
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65 mftbu %0\n\ |
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66 cmpw %0,%1\n\ |
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67 bne 1b" |
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68 : "=r" (retval), "=r" (junk)); |
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69 return retval; |
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70 } |
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71 |
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72 #else |
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73 |
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74 #error Need implementation of sqlite3Hwtime() for your platform. |
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75 |
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76 /* |
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77 ** To compile without implementing sqlite3Hwtime() for your platform, |
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78 ** you can remove the above #error and use the following |
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79 ** stub function. You will lose timing support for many |
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80 ** of the debugging and testing utilities, but it should at |
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81 ** least compile and run. |
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82 */ |
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83 sqlite_uint64 sqlite3Hwtime(void){ return ((sqlite_uint64)0); } |
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84 |
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85 #endif |
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86 |
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87 #endif /* !defined(_HWTIME_H_) */ |