| 1 |
#include <stdio.h> |
| 2 |
#include <stdlib.h> |
| 3 |
#include <sys/types.h> |
| 4 |
#include <sys/time.h> |
| 5 |
#include <sys/resource.h> |
| 6 |
|
| 7 |
#define N_CALLS_PER_PAGE 1024 |
| 8 |
|
| 9 |
#define MHZ 533 |
| 10 |
|
| 11 |
struct cpu; |
| 12 |
|
| 13 |
struct instr_call { |
| 14 |
void (*f)(struct cpu *cpu, struct instr_call *ic); |
| 15 |
int instr_len; |
| 16 |
void *arg[3]; |
| 17 |
}; |
| 18 |
|
| 19 |
struct cpu { |
| 20 |
void *curpage; |
| 21 |
int orig_nloops; |
| 22 |
int nloops; |
| 23 |
|
| 24 |
struct instr_call *next_instr_call; |
| 25 |
}; |
| 26 |
|
| 27 |
void r(struct cpu *cpu) |
| 28 |
{ |
| 29 |
struct instr_call *ic; |
| 30 |
|
| 31 |
for (;;) { |
| 32 |
ic = cpu->next_instr_call++; |
| 33 |
ic->f(cpu, ic); |
| 34 |
|
| 35 |
ic = cpu->next_instr_call++; |
| 36 |
ic->f(cpu, ic); |
| 37 |
|
| 38 |
ic = cpu->next_instr_call++; |
| 39 |
ic->f(cpu, ic); |
| 40 |
|
| 41 |
ic = cpu->next_instr_call++; |
| 42 |
ic->f(cpu, ic); |
| 43 |
|
| 44 |
ic = cpu->next_instr_call++; |
| 45 |
ic->f(cpu, ic); |
| 46 |
|
| 47 |
ic = cpu->next_instr_call++; |
| 48 |
ic->f(cpu, ic); |
| 49 |
|
| 50 |
ic = cpu->next_instr_call++; |
| 51 |
ic->f(cpu, ic); |
| 52 |
|
| 53 |
ic = cpu->next_instr_call++; |
| 54 |
ic->f(cpu, ic); |
| 55 |
} |
| 56 |
} |
| 57 |
|
| 58 |
|
| 59 |
void f_add(struct cpu *cpu, struct instr_call *ic) |
| 60 |
{ |
| 61 |
int *a = (int *) ic->arg[0]; |
| 62 |
int *b = (int *) ic->arg[1]; |
| 63 |
int *c = (int *) ic->arg[2]; |
| 64 |
|
| 65 |
*a = (*b) + (*c); |
| 66 |
|
| 67 |
#if 0 |
| 68 |
ic = cpu->next_instr_call++; |
| 69 |
|
| 70 |
a = (int *) ic->arg[0]; |
| 71 |
b = (int *) ic->arg[1]; |
| 72 |
c = (int *) ic->arg[2]; |
| 73 |
|
| 74 |
*a = (*b) + (*c); |
| 75 |
#endif |
| 76 |
} |
| 77 |
|
| 78 |
|
| 79 |
void f_sub(struct cpu *cpu, struct instr_call *ic) |
| 80 |
{ |
| 81 |
int *a = (int *) ic->arg[0]; |
| 82 |
int *b = (int *) ic->arg[1]; |
| 83 |
int *c = (int *) ic->arg[2]; |
| 84 |
*a = (*b) - (*c); |
| 85 |
} |
| 86 |
|
| 87 |
|
| 88 |
void f_and(struct cpu *cpu, struct instr_call *ic) |
| 89 |
{ |
| 90 |
int *a = (int *) ic->arg[0]; |
| 91 |
int *b = (int *) ic->arg[1]; |
| 92 |
int *c = (int *) ic->arg[2]; |
| 93 |
*a = (*b) & (*c); |
| 94 |
} |
| 95 |
|
| 96 |
|
| 97 |
void f_or(struct cpu *cpu, struct instr_call *ic) |
| 98 |
{ |
| 99 |
int *a = (int *) ic->arg[0]; |
| 100 |
int *b = (int *) ic->arg[1]; |
| 101 |
int *c = (int *) ic->arg[2]; |
| 102 |
*a = (*b) | (*c); |
| 103 |
} |
| 104 |
|
| 105 |
|
| 106 |
void f_end(struct cpu *cpu, struct instr_call *ic) |
| 107 |
{ |
| 108 |
struct rusage rusage; |
| 109 |
double t, mips; |
| 110 |
|
| 111 |
cpu->nloops--; |
| 112 |
if (cpu->nloops > 0) { |
| 113 |
cpu->next_instr_call = cpu->curpage; |
| 114 |
return; |
| 115 |
} |
| 116 |
|
| 117 |
getrusage(RUSAGE_SELF, &rusage); |
| 118 |
t = rusage.ru_utime.tv_sec + rusage.ru_utime.tv_usec / 1000000.0; |
| 119 |
mips = (float)(N_CALLS_PER_PAGE * cpu->orig_nloops) / t |
| 120 |
/ 1000000.0; |
| 121 |
|
| 122 |
printf("%.2f user seconds = %.1f MIPS. %.1f cycles/emulated " |
| 123 |
"instruction on a %i MHz machine\n", (float)t, (float)mips, |
| 124 |
(float)MHZ/mips, MHZ); |
| 125 |
exit(1); |
| 126 |
} |
| 127 |
|
| 128 |
|
| 129 |
int main(int argc, char *argv[]) |
| 130 |
{ |
| 131 |
int32_t tmp_a, tmp_b, tmp_c; |
| 132 |
struct instr_call *call_array; |
| 133 |
int i, ncalls; |
| 134 |
struct cpu *cpu = malloc(sizeof(struct cpu)); |
| 135 |
|
| 136 |
if (argc <= 1) { |
| 137 |
fprintf(stderr, "usage: %s n\n", argv[0]); |
| 138 |
exit(1); |
| 139 |
} |
| 140 |
|
| 141 |
cpu->orig_nloops = cpu->nloops = atoi(argv[1]); |
| 142 |
ncalls = N_CALLS_PER_PAGE + 1; |
| 143 |
|
| 144 |
/* Fill a range of nonsense calls: */ |
| 145 |
call_array = malloc(sizeof(struct instr_call) * ncalls); |
| 146 |
cpu->curpage = call_array; |
| 147 |
|
| 148 |
printf("ncalls = %i\n", ncalls); |
| 149 |
for (i=0; i<ncalls; i++) { |
| 150 |
if (i == ncalls-1) { |
| 151 |
call_array[i].f = f_end; |
| 152 |
} else { |
| 153 |
switch (i & 3) { |
| 154 |
case 0: call_array[i].f = f_add; |
| 155 |
case 1: call_array[i].f = f_sub; |
| 156 |
case 2: call_array[i].f = f_and; |
| 157 |
case 3: call_array[i].f = f_or; |
| 158 |
} |
| 159 |
|
| 160 |
call_array[i].arg[0] = &tmp_a; |
| 161 |
call_array[i].arg[1] = &tmp_b; |
| 162 |
call_array[i].arg[2] = &tmp_c; |
| 163 |
} |
| 164 |
} |
| 165 |
|
| 166 |
printf("running...\n"); |
| 167 |
cpu->next_instr_call = &call_array[0]; |
| 168 |
r(cpu); |
| 169 |
|
| 170 |
printf("ERROR!\n"); |
| 171 |
return 0; |
| 172 |
} |
| 173 |
|
Parent Directory
| 
Revision Log