|
Revision 462, 0.9 KB
(checked in by cameron, 3 years ago)
|
|
perflib and block_carry.h
|
| Line | |
|---|
| 1 | #ifndef I386_TIMER_H |
|---|
| 2 | #define I386_TIMER_H |
|---|
| 3 | |
|---|
| 4 | #ifdef _MSC_VER
|
|---|
| 5 | #include <intrin.h>
|
|---|
| 6 | #pragma intrinsic(__rdtsc)
|
|---|
| 7 | #pragma intrinsic(_BitScanReverse)
|
|---|
| 8 | #endif
|
|---|
| 9 |
|
|---|
| 10 | #define cycle_counter_units "cyc" |
|---|
| 11 | |
|---|
| 12 | typedef unsigned long long int timestamp_t;
|
|---|
| 13 |
|
|---|
| 14 | static inline timestamp_t read_cycle_counter () {
|
|---|
| 15 | #ifdef __GNUC__
|
|---|
| 16 | timestamp_t ts;
|
|---|
| 17 | #ifdef __x86_64__
|
|---|
| 18 | unsigned int eax, edx;
|
|---|
| 19 | asm volatile("rdtsc" : "=a" (eax), "=d" (edx));
|
|---|
| 20 | ts = ((timestamp_t) eax) | (((timestamp_t) edx) << 32);
|
|---|
| 21 | #else
|
|---|
| 22 | asm volatile("rdtsc\n" : "=A" (ts));
|
|---|
| 23 | #endif
|
|---|
| 24 | return(ts);
|
|---|
| 25 | #endif
|
|---|
| 26 | #ifdef _MSC_VER
|
|---|
| 27 | return __rdtsc();
|
|---|
| 28 | #endif
|
|---|
| 29 | }
|
|---|
| 30 |
|
|---|
| 31 | static inline int binary_order_of_magnitude(timestamp_t ts) {
|
|---|
| 32 | #if __GNUC__
|
|---|
| 33 | return 64 - __builtin_clzll(ts);
|
|---|
| 34 | #endif
|
|---|
| 35 | #ifdef _MSC_VER
|
|---|
| 36 | unsigned long index;
|
|---|
| 37 | if (_BitScanReverse(&index, (uint32_t)(ts&0xFFFFFFFF)))
|
|---|
| 38 | return index;
|
|---|
| 39 | else if(_BitScanReverse(&index, (uint32_t)(ts>>32)))
|
|---|
| 40 | return 32 + index;
|
|---|
| 41 | else return 64;
|
|---|
| 42 | #endif
|
|---|
| 43 | }
|
|---|
| 44 |
#endif |
|---|
| 45 | |
|---|
