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/* This program tests various tile_copying functions.
Here are some results seen so far.
Pentium 2 K6-2 Alpha UltraSparc
5.380000 2.820000 7.051600 3.260000
5.030000 2.650000 9.738528 4.690000
6.050000 3.160000 7.072096 3.260000
17.930000 untested untested untested
Pentium G3
33.251687 2.490000
33.260924 2.630000
50.832590 2.620000
untested untested
*/
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <strings.h>
#include <stdio.h>
#define xbuf 512
#define buf 20*24*1000
typedef unsigned int a_u32;
typedef unsigned char a_pixel;
a_pixel s[27 * 10 * 20 * 24];
a_pixel d[20 * 24 * 1000];
static void
copy_tile1 (const a_pixel* src, a_pixel* dest, int tx)
{
const a_u32 *s = (const a_u32 *) src;
a_u32 *d = (a_u32 *) dest;
a_u32 t1, t2;
int y;
for (y = 20; y; --y) { /* FIXME: Is this really faster than a */
t1 = s[0]; /* straight copy? Need a benchmark */
t2 = s[3];
d[0] = t1;
d[3] = t2;
t1 = s[1];
t2 = s[4];
d[1] = t1;
d[4] = t2;
t1 = s[2];
t2 = s[5];
d[2] = t1;
d[5] = t2;
s = (const a_u32 *) (((a_pixel *) s) + tx);
d = (a_u32 *) (((a_pixel *) d) + xbuf);
}
}
static void
copy_tile2 (const a_pixel* src, a_pixel* dest, int tx)
{
const a_u32 *s = (const a_u32 *) src;
a_u32 *d = (a_u32 *) dest;
int y;
for (y = 20; y; --y) {
d[0] = s[0];
d[1] = s[1];
d[2] = s[2];
d[3] = s[3];
d[4] = s[4];
d[5] = s[5];
s = (const a_u32 *) (((a_pixel *) s) + tx);
d = (a_u32 *) (((a_pixel *) d) + xbuf);
}
}
static void
copy_tile3 (const a_pixel* src, a_pixel* dest, int tx)
{
const a_u32 *s = (const a_u32 *) src;
const a_u32 *s2 = (const a_u32 *) (src + tx);
a_u32 *d = (a_u32 *) dest;
a_u32 *d2 = (a_u32 *) (dest + xbuf);
int y;
tx *= 2;
for (y = 10; y; --y) {
a_u32 t1 = s[0];
a_u32 t2 = s2[0];
d[0] = t1;
d2[0] = t2;
t1 = s[1];
t2 = s2[1];
d[1] = t1;
d2[1] = t2;
t1 = s[2];
t2 = s2[2];
d[2] = t1;
d2[2] = t2;
t1 = s[3];
t2 = s2[3];
d[3] = t1;
d2[3] = t2;
t1 = s[4];
t2 = s2[4];
d[4] = t1;
d2[4] = t2;
t1 = s[5];
t2 = s2[5];
d[5] = t1;
d2[5] = t2;
s = (const a_u32 *) (((const a_pixel *) s) + tx);
s2 = (const a_u32 *) (((const a_pixel *) s2) + tx);
d = (a_u32 *) (((a_pixel *) d) + 2 * xbuf);
d2 = (a_u32 *) (((a_pixel *) d2) + 2 * xbuf);
}
}
static void
copy_tile4 (const a_pixel* src, a_pixel* dest, int tx)
{
int y;
for (y = 20; y; --y) {
memcpy (dest, src, 24);
src += tx;
dest += xbuf;
}
}
/* Subtract the `struct timeval' values X and Y,
storing the result in RESULT.
Return 1 if the difference is negative, otherwise 0. */
int
timeval_subtract (struct timeval *result, struct timeval *x, struct timeval *y)
{
/* Perform the carry for the later subtraction by updating Y. */
if (x->tv_usec < y->tv_usec) {
int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
y->tv_usec -= 1000000 * nsec;
y->tv_sec += nsec;
}
if (x->tv_usec - y->tv_usec > 1000000) {
int nsec = (x->tv_usec - y->tv_usec) / 1000000;
y->tv_usec += 1000000 * nsec;
y->tv_sec -= nsec;
}
/* Compute the time remaining to wait.
`tv_usec' is certainly positive. */
result->tv_sec = x->tv_sec - y->tv_sec;
result->tv_usec = x->tv_usec - y->tv_usec;
/* Return 1 if result is negative. */
return x->tv_sec < y->tv_sec;
}
struct timeval utime;
void
start (void)
{
struct rusage usage;
getrusage (RUSAGE_SELF, &usage);
utime = usage.ru_utime;
}
void
stop (void)
{
struct timeval result;
struct rusage usage;
getrusage (RUSAGE_SELF, &usage);
timeval_subtract (&result, &usage.ru_utime, &utime);
printf ("%f\n", result.tv_sec * 1.0 + result.tv_usec / 1000000.0);
}
#define TIMES 5000000
int main()
{
unsigned i, n;
memset (s, 0, sizeof s);
memset (d, 0, sizeof d);
start();
for (i = 1, n = 0; i < TIMES; i++) {
copy_tile1 (s + (n * 547) % (27 * 10), d + (n % 1000) * 20 * 24, 27 * 24);
}
stop();
start();
for (i = 1, n = 0; i < TIMES; i++) {
copy_tile2 (s + (n * 547) % (27 * 10), d + (n % 1000) * 20 * 24, 27 * 24);
}
stop();
start();
for (i = 1, n = 0; i < TIMES; i++) {
copy_tile3 (s + (n * 547) % (27 * 10), d + (n % 1000) * 20 * 24, 27 * 24);
}
stop();
start();
for (i = 1, n = 0; i < TIMES; i++) {
copy_tile4 (s + (n * 547) % (27 * 10), d + (n % 1000) * 20 * 24, 27 * 24);
}
stop();
return 0;
}
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