| 1 | #include "timing.h" |
|---|---|
| 2 | #include <stdio.h> |
| 3 | |
| 4 | #ifndef LIBNAME |
| 5 | #define LIBNAME UNKNOWN |
| 6 | #endif |
| 7 | |
| 8 | #define LIBSTRING LIBSTRINGX(LIBNAME) |
| 9 | #define LIBSTRINGX(a) LIBSTRINGXX(a) |
| 10 | #define LIBSTRINGXX(a) #a |
| 11 | |
| 12 | double __floatundidf(uint64_t x); |
| 13 | |
| 14 | int main(int argc, char *argv[]) { |
| 15 | #define INPUT_SIZE 512 |
| 16 | uint64_t input[INPUT_SIZE]; |
| 17 | int i, j; |
| 18 | |
| 19 | srand(seed: 42); |
| 20 | |
| 21 | // Initialize the input array with data of various sizes. |
| 22 | for (i=0; i<INPUT_SIZE; ++i) |
| 23 | input[i] = (((uint64_t)rand() << 32) | (uint64_t)rand()) >> (rand() & 63); |
| 24 | |
| 25 | double bestTime = __builtin_inf(); |
| 26 | void *dummyp; |
| 27 | for (j=0; j<1024; ++j) { |
| 28 | |
| 29 | uint64_t startTime = mach_absolute_time(); |
| 30 | for (i=0; i<INPUT_SIZE; ++i) |
| 31 | __floatundidf(x: input[i]); |
| 32 | uint64_t endTime = mach_absolute_time(); |
| 33 | |
| 34 | double thisTime = intervalInCycles(startTime, endTime); |
| 35 | bestTime = __builtin_fmin(thisTime, bestTime); |
| 36 | |
| 37 | // Move the stack alignment between trials to eliminate (mostly) aliasing effects |
| 38 | dummyp = alloca(1); |
| 39 | } |
| 40 | |
| 41 | printf(format: "%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE); |
| 42 | |
| 43 | return 0; |
| 44 | } |
| 45 |