Subversion Repositories openrisc_2011-10-31

/*

 *  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;

}