#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "pari.h"

#if defined (USG) || defined (__SVR4) || defined (_UNICOS) || defined(HPUX)
#include <time.h>

int
cputime ()
{
  if (CLOCKS_PER_SEC < 100000)
    return clock () * 1000 / CLOCKS_PER_SEC;
  return clock () / (CLOCKS_PER_SEC / 1000);
}
#else
#include <sys/types.h>
#include <sys/resource.h>

int
cputime ()
{
  struct rusage rus;

  getrusage (0, &rus);
  return rus.ru_utime.tv_sec * 1000 + rus.ru_utime.tv_usec / 1000;
}
#endif

int
main(int argc, char *argv[])
{
  int n, prec, st, st2, N, i;
  GEN x, y, z;
  unsigned long ltop;

  if (argc != 2 && argc != 3) {
    fprintf(stderr, "Usage: timing digits [N]\n"); exit(1);
  }
  n = atoi(argv[1]);
  if (argc==3)  N = atoi(argv[2]);
  prec = (int) ( n * log(10.0) / log(2.0) + 1.0 );
  printf("prec=%d\n", n);

  pari_init(10000000, 2);

  x = gsqrt(stoi(3), (prec - 1)/BITS_IN_LONG + 3); x = addsr (-1, x);
  y = gsqrt(stoi(5), (prec - 1)/BITS_IN_LONG + 3);
  (void) mplog2((prec - 1)/BITS_IN_LONG + 4);
  (void)   mppi((prec - 1)/BITS_IN_LONG + 4);

#define TIME(__s__, __EXPR__) \
  N=1;  st = cputime(); \
  do { \
    for (i=0;i<N;i++) __EXPR__, avma = ltop; \
    N=2*N; \
    st2=cputime(); \
  } while (st2-st<1000); \
  printf("%-12s took %f ms (%d eval in %d ms)\n", \
         __s__,(double)(st2-st)/(N-1),N-1,st2-st);

  ltop = avma;
  TIME("x*y", z = mulrr(x, y));
  TIME("x*x", z = sqrr(x));
  TIME("x/y", z = divrr(x, y));
  TIME("sqrt(x)", z = sqrtr(x));
  TIME("exp(x)", z = mpexp(x));
  TIME("log(x)", z = logr_abs(x));
  TIME("sin(x)", z = mpsin(x));
  TIME("cos(x)", z = mpcos(x));
  TIME("arccos(x)", z = gacos(x, 0));
  TIME("arctan(x)", z = gatan(x, 0));
  return 0;
}