test/sysperf/call3.c

   1 /*
   2  * call3.c
   3  *
   4  * Test a standard function call to a function which does nothing much.
   5  *
   6  * $DragonFly: src/test/sysperf/call3.c,v 1.3 2005/08/02 17:11:04 hmp Exp $
   7  */
   8
   9 #include "blib.h"
  10
  11 #define LOOP 500000000
  12
  13 __asm(".p2align 6");
  14 static void nop1(void) { }
  15 __asm(".p2align 6");
  16 static void nop2(void) { }
  17 __asm(".p2align 6");
  18 static void nop(void (*func)(void)) { func(); }
  19
  20 int
  21 main(int ac, char **av)
  22 {
  23     int i;
  24
  25     printf("call nop() function through function pointer in loop\n");
  26     start_timing();
  27     for (i = 0; i < LOOP; ++i) {
  28         nop(nop1);
  29         nop(nop1);
  30     }
  31     stop_timing(LOOP * 2, "call3/nop1-1");
  32     start_timing();
  33     for (i = 0; i < LOOP; ++i) {
  34         nop(nop1);
  35         nop(nop2);
  36     }
  37     stop_timing(LOOP * 2, "call3/nop1-2");
  38     start_timing();
  39     for (i = 0; i < LOOP; ++i) {
  40         nop(nop2);
  41         nop(nop2);
  42     }
  43     stop_timing(LOOP * 2, "call3/nop2-2");
  44     return(0);
  45 }
  46