compiler-rt/test/builtins/timing/ashldi3.c

   1 #include "timing.h"
   2 #include <stdio.h>
   3
   4 #define INPUT_TYPE int
   5 #define INPUT_SIZE 512
   6 #define FUNCTION_NAME __ashldi3
   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 int64_t FUNCTION_NAME(int64_t input, INPUT_TYPE count);
  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] = rand() & 0x3f;
  27
  28         int64_t fixedInput = INT64_C(0x1234567890ABCDEF);
  29
  30         double bestTime = __builtin_inf();
  31         void *dummyp;
  32         for (j=0; j<1024; ++j) {
  33
  34                 uint64_t startTime = mach_absolute_time();
  35                 for (i=0; i<INPUT_SIZE; ++i)
  36                         FUNCTION_NAME(fixedInput, input[i]);
  37                 uint64_t endTime = mach_absolute_time();
  38
  39                 double thisTime = intervalInCycles(startTime, endTime);
  40                 bestTime = __builtin_fmin(thisTime, bestTime);
  41
  42                 // Move the stack alignment between trials to eliminate (mostly) aliasing effects
  43                 dummyp = alloca(1);
  44         }
  45
  46         printf("%16s: %f cycles.\n", LIBSTRING, bestTime / (double) INPUT_SIZE);
  47
  48         return 0;
  49 }