newlib-cygwin/newlib/libc/machine/m68k/strcpy.c

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2000-02-18 03:39:52 +08:00
/*
* C library strcpy routine
*
* This routine has been optimized for the CPU32+.
* It should run on all 68k machines.
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*/
#include <string.h>
/*
* Copy bytes using CPU32+ loop mode if possible
*/
char *
strcpy (char *to, const char *from)
{
char *pto = to;
unsigned int n = 0xFFFF;
asm volatile ("1:\n"
"\tmove.b (%0)+,(%1)+\n"
#if defined(__mcpu32__)
"\tdbeq %2,1b\n"
#endif
"\tbne.b 1b\n" :
"=a" (from), "=a" (pto), "=d" (n) :
"0" (from), "1" (pto), "2" (n) :
"cc", "memory");
return to;
}