// command line to compile and link:
// ~/AFSWD/install/gcc-4.3.2/binsh/gcc -mtune=native -march=native -Wall -O3 benchmark_sin.c -o benchmark_sin -lm -lrt

// command line to run:
// ./benchmark_sin

#include <stdio.h>
#include <math.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

#define MEASURE_WALLCLOCK_TIME(message, code, line_number, file) \
{ \
struct timespec start_time_struct; \
struct timespec end_time_struct; \
\
clock_gettime(CLOCK_MONOTONIC, &start_time_struct); \
  {\
  code; \
  }\
clock_gettime(CLOCK_MONOTONIC, &end_time_struct); \
time_t seconds_diff = end_time_struct.tv_sec - start_time_struct.tv_sec; \
long nanoseconds_diff = end_time_struct.tv_nsec - start_time_struct.tv_nsec; \
fprintf(stderr, "%s took %g seconds at line #%d of '%s' file\n", message, (double)seconds_diff + 1e-9 * (double)nanoseconds_diff, line_number, file);\
}

#define MEASURE_CPU_TIME(message, code, line_number, file) \
{ \
clock_t start_time = clock(); \
  { \
  code; \
  } \
fprintf(stderr, "%s took %g seconds at line number %d of '%s' file\n", message, (((double)clock() - (double)start_time) / (double)CLOCKS_PER_SEC), line_number, file); \
}

#define N ((unsigned)1000000)

double ___angles[N];
double ___sins[N];

int main()
  {
    {
    unsigned en;
    for(en = 0; en < N; en++)
      {
      ___angles[en] = M_PI * ((double)en) / (double)(N);
      }
    }

  MEASURE_WALLCLOCK_TIME
    (
    "Wallclock time", // message,
      {
      MEASURE_CPU_TIME
        (
        "CPU time", // message,
          {
          unsigned en;
          for(en = 0; en < N; en++)
            {
            ___sins[en] = sin(___angles[en]);
            }
          },      // code,
        __LINE__, // line_number,
        __FILE__  // file
        )
      },              // code,
    __LINE__,        // line_number,
    __FILE__         // file
    )

  return 0;
  }