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#include <stdlib.h>
#include <stdio.h>
#include <time.h>

/*  My results:
@kuma:~/eruta/tool/try$ gcc struct.c -o struct
bjorn@kuma:~/eruta/tool/try$ ./struct
Ticks pass by pointer: 8800000
Result: 1000000002
Ticks pass by value: 5440000
Result: 1000000002
bjorn@kuma:~/eruta/tool/try$ gcc -O struct.c -o struct
bjorn@kuma:~/eruta/tool/try$ ./struct
Ticks pass by pointer: 3360000
Result: 1000000002
Ticks pass by value: 4180000
Result: 1000000002
bjorn@kuma:~/eruta/tool/try$ gcc -O2 struct.c -o struct
bjorn@kuma:~/eruta/tool/try$ ./struct
Ticks pass by pointer: 4590000
Result: 1000000002
Ticks pass by value: 4560000
Result: 1000000002
bjorn@kuma:~/eruta/tool/try$

Conclusion: I stand corrected in the case of optimization with gcc.

*/

#ifndef ITERATIONS
  #define ITERATIONS 1000000000
#endif

struct try {
  int one;
  int two;
};

int foo_value(struct try t) {
  return t.one + t.two;
}

int foo_pointer(struct try * t) {
  return t->one + t->two;
}


int main (void) {
  long index;
  clock_t start, stop;
  struct try   tryv = { 1 , 2};
  struct try * tryp = NULL;
  tryp              = malloc(sizeof(struct try));
  tryp->one         = 1;
  tryp->two         = 2;
  start             = clock();
  for (index = 0 ; index < ITERATIONS ; index++) {
    tryp->two       = foo_pointer(tryp);
  }
  stop              = clock();
  printf("Ticks pass by pointer: %ld\n", stop - start);
  printf("Result: %d\n", tryp->two);
  start             = clock();
  for (index = 0 ; index < ITERATIONS ; index++) {
    tryv.two        = foo_value(tryv);
  }
  stop              = clock();
  printf("Ticks pass by value: %ld\n", stop - start);
  printf("Result: %d\n", tryv.two);
  free(tryp);
  return 0;
}