compiler-rt/test/builtins/timing/negdi2.c

   1 #include "timing.h"
   2 #include <stdio.h>
   3
   4 #define INPUT_TYPE int64_t
   5 #define INPUT_SIZE 256
   6 #define FUNCTION_NAME __negdi2
   7
   8 #ifndef LIBNAME
   9 #define LIBNAME UNKNOWN
  10 #endif
  11
  12 #define LIBSTRING               LIBSTRINGX(LIBNAME)
  13 #define LIBSTRINGX(a)   LIBSTRINGXX(a)
  14 #define LIBSTRINGXX(a)  #a
  15
  16 INPUT_TYPE FUNCTION_NAME(INPUT_TYPE input);
  17
  18 int main(int argc, char *argv[]) {
  19         INPUT_TYPE input[INPUT_SIZE];
  20         int i, j;
  21
  22         srand(42);
  23
  24         // Initialize the input array with data of various sizes.
  25         for (i=0; i<INPUT_SIZE; ++i) {
  26                 input[i] = (((int64_t)rand() << 36) | (uint64_t)rand()) >> (rand() & 63);
  27         }
  28
  29         int64_t fixedInput = INT64_C(0x1234567890ABCDEF);
  30
  31         double bestTime = __builtin_inf();
  32         void *dummyp;
  33         for (j=0; j<1024; ++j) {
  34
  35                 uint64_t startTime = mach_absolute_time();
  36                 for (i=0; i<INPUT_SIZE; ++i)
  37                         FUNCTION_NAME(input[i]);
  38                 uint64_t endTime = mach_absolute_time();
  39
  40                 double thisTime = intervalInCycles(startTime, endTime);
  41                 bestTime = __builtin_fmin(thisTime, bestTime);
  42
  43                 // Move the stack alignment between trials to eliminate (mostly) aliasing effects
  44                 dummyp = alloca(1);
  45         }
  46
  47         printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);
  48
  49         return 0;
  50 }