37 lines
939 B

#include "byte.h"
/* byte_copy copies in[0] to out[0], in[1] to out[1], ... and in[len-1]
* to out[len-1]. */
void byte_copy(void* out, size_t len, const void* in) {
char* s=out;
const char* t=in;
#if 1
/* gcc 4.3.1 generates wrong code for this, so I'm switching to
* simpler code */
size_t i;
for (i=0; i<len; ++i)
const char* u=t+len;
if (len>127) {
while ((unsigned long)s&(sizeof(unsigned long)-1)) {
*s=*t; ++s; ++t;
/* s (destination) is now unsigned long aligned */
#ifndef __i386__
if (!((unsigned long)t&(sizeof(unsigned long)-1)))
while (t+sizeof(unsigned long)<=u) {
*(unsigned long*)s=*(unsigned long*)t;
s+=sizeof(unsigned long); t+=sizeof(unsigned long);
for (;;) {
if (t==u) break; *s=*t; ++s; ++t;
if (t==u) break; *s=*t; ++s; ++t;
if (t==u) break; *s=*t; ++s; ++t;
if (t==u) break; *s=*t; ++s; ++t;