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| 1 /* | |
| 2 ** 2008 May 27 | |
| 3 ** | |
| 4 ** The author disclaims copyright to this source code. In place of | |
| 5 ** a legal notice, here is a blessing: | |
| 6 ** | |
| 7 ** May you do good and not evil. | |
| 8 ** May you find forgiveness for yourself and forgive others. | |
| 9 ** May you share freely, never taking more than you give. | |
| 10 ** | |
| 11 ****************************************************************************** | |
| 12 ** | |
| 13 ** This file contains inline asm code for retrieving "high-performance" | |
| 14 ** counters for x86 class CPUs. | |
| 15 */ | |
| 16 #ifndef _HWTIME_H_ | |
| 17 #define _HWTIME_H_ | |
| 18 | |
| 19 /* | |
| 20 ** The following routine only works on pentium-class (or newer) processors. | |
| 21 ** It uses the RDTSC opcode to read the cycle count value out of the | |
| 22 ** processor and returns that value. This can be used for high-res | |
| 23 ** profiling. | |
| 24 */ | |
| 25 #if (defined(__GNUC__) || defined(_MSC_VER)) && \ | |
| 26 (defined(i386) || defined(__i386__) || defined(_M_IX86)) | |
| 27 | |
| 28 #if defined(__GNUC__) | |
| 29 | |
| 30 __inline__ sqlite_uint64 sqlite3Hwtime(void){ | |
| 31 unsigned int lo, hi; | |
| 32 __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi)); | |
| 33 return (sqlite_uint64)hi << 32 | lo; | |
| 34 } | |
| 35 | |
| 36 #elif defined(_MSC_VER) | |
| 37 | |
| 38 __declspec(naked) __inline sqlite_uint64 __cdecl sqlite3Hwtime(void){ | |
| 39 __asm { | |
| 40 rdtsc | |
| 41 ret ; return value at EDX:EAX | |
| 42 } | |
| 43 } | |
| 44 | |
| 45 #endif | |
| 46 | |
| 47 #elif (defined(__GNUC__) && defined(__x86_64__)) | |
| 48 | |
| 49 __inline__ sqlite_uint64 sqlite3Hwtime(void){ | |
| 50 unsigned long val; | |
| 51 __asm__ __volatile__ ("rdtsc" : "=A" (val)); | |
| 52 return val; | |
| 53 } | |
| 54 | |
| 55 #elif (defined(__GNUC__) && defined(__ppc__)) | |
| 56 | |
| 57 __inline__ sqlite_uint64 sqlite3Hwtime(void){ | |
| 58 unsigned long long retval; | |
| 59 unsigned long junk; | |
| 60 __asm__ __volatile__ ("\n\ | |
| 61 1: mftbu %1\n\ | |
| 62 mftb %L0\n\ | |
| 63 mftbu %0\n\ | |
| 64 cmpw %0,%1\n\ | |
| 65 bne 1b" | |
| 66 : "=r" (retval), "=r" (junk)); | |
| 67 return retval; | |
| 68 } | |
| 69 | |
| 70 #else | |
| 71 | |
| 72 #error Need implementation of sqlite3Hwtime() for your platform. | |
| 73 | |
| 74 /* | |
| 75 ** To compile without implementing sqlite3Hwtime() for your platform, | |
| 76 ** you can remove the above #error and use the following | |
| 77 ** stub function. You will lose timing support for many | |
| 78 ** of the debugging and testing utilities, but it should at | |
| 79 ** least compile and run. | |
| 80 */ | |
| 81 sqlite_uint64 sqlite3Hwtime(void){ return ((sqlite_uint64)0); } | |
| 82 | |
| 83 #endif | |
| 84 | |
| 85 #endif /* !defined(_HWTIME_H_) */ | |
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Chromium Code Reviews
Issue 2846743003:
[sql] Remove SQLite 3.10.2 reference directory. (Closed)
