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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
/* #define N_CALLS_PER_PAGE 1024 */
#define N_CALLS_PER_PAGE 128
#define MHZ 533
struct cpu;
struct instr_call {
void (*f)(struct cpu *cpu, struct instr_call *ic);
/* int instr_len; */
void *arg[3];
};
struct cpu {
void *curpage;
int orig_nloops;
int nloops;
struct instr_call *next_instr_call;
};
void r(struct cpu *cpu)
{
struct instr_call *ic;
for (;;) {
ic = cpu->next_instr_call++;
ic->f(cpu, ic);
ic = cpu->next_instr_call++;
ic->f(cpu, ic);
ic = cpu->next_instr_call++;
ic->f(cpu, ic);
ic = cpu->next_instr_call++;
ic->f(cpu, ic);
ic = cpu->next_instr_call++;
ic->f(cpu, ic);
ic = cpu->next_instr_call++;
ic->f(cpu, ic);
ic = cpu->next_instr_call++;
ic->f(cpu, ic);
ic = cpu->next_instr_call++;
ic->f(cpu, ic);
}
}
void f_add(struct cpu *cpu, struct instr_call *ic)
{
#if 0
#if 0
int *a = (int *) ic->arg[0];
int *b = (int *) ic->arg[1];
int *c = (int *) ic->arg[2];
*a = (*b) + (*c);
#else
int *a = (int *) ic->arg[0];
int *b = (int *) ic->arg[1];
int *c = (int *) ic->arg[2];
int *d, *e, *f;
ic = cpu->next_instr_call++;
d = (int *) ic->arg[0];
e = (int *) ic->arg[1];
f = (int *) ic->arg[2];
*a = (*b) + (*c);
*d = (*e) + (*f);
#endif
#endif
}
void f_sub(struct cpu *cpu, struct instr_call *ic)
{
int *a = (int *) ic->arg[0];
int *b = (int *) ic->arg[1];
int *c = (int *) ic->arg[2];
*a = (*b) - (*c);
}
void f_and(struct cpu *cpu, struct instr_call *ic)
{
int *a = (int *) ic->arg[0];
int *b = (int *) ic->arg[1];
int *c = (int *) ic->arg[2];
*a = (*b) & (*c);
}
void f_or(struct cpu *cpu, struct instr_call *ic)
{
int *a = (int *) ic->arg[0];
int *b = (int *) ic->arg[1];
int *c = (int *) ic->arg[2];
*a = (*b) | (*c);
}
void f_end(struct cpu *cpu, struct instr_call *ic)
{
struct rusage rusage;
double t, mips;
cpu->nloops--;
if (cpu->nloops > 0) {
cpu->next_instr_call = cpu->curpage;
return;
}
getrusage(RUSAGE_SELF, &rusage);
t = rusage.ru_utime.tv_sec + rusage.ru_utime.tv_usec / 1000000.0;
mips = (float)(N_CALLS_PER_PAGE * cpu->orig_nloops) / t
/ 1000000.0;
printf("%.2f user seconds = %.1f MIPS. %.1f cycles/emulated "
"instruction on a %i MHz machine\n", (float)t, (float)mips,
(float)MHZ/mips, MHZ);
exit(1);
}
int main(int argc, char *argv[])
{
int32_t tmp_a, tmp_b, tmp_c;
struct instr_call *call_array;
int i, ncalls;
struct cpu *cpu = malloc(sizeof(struct cpu));
if (argc <= 1) {
fprintf(stderr, "usage: %s n\n", argv[0]);
exit(1);
}
cpu->orig_nloops = cpu->nloops = atoi(argv[1]);
ncalls = N_CALLS_PER_PAGE + 1;
/* Fill a range of nonsense calls: */
call_array = malloc(sizeof(struct instr_call) * ncalls);
cpu->curpage = call_array;
printf("ncalls = %i\n", ncalls);
for (i=0; i<ncalls; i++) {
if (i == ncalls-1) {
call_array[i].f = f_end;
} else {
#if 0
switch (i & 3) {
case 0: call_array[i].f = f_add;
case 1: call_array[i].f = f_sub;
case 2: call_array[i].f = f_and;
case 3: call_array[i].f = f_or;
}
#else
call_array[i].f = f_add;
#endif
call_array[i].arg[0] = &tmp_a;
call_array[i].arg[1] = &tmp_b;
call_array[i].arg[2] = &tmp_c;
}
}
printf("running...\n");
cpu->next_instr_call = &call_array[0];
r(cpu);
printf("ERROR!\n");
return 0;
}
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