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

63 lines
1.0 KiB
C

#if defined __thumb__
#include "../../string/strcpy.c"
#else
#include <string.h>
#include "xscale.h"
char *
strcpy (char *dest, const char *src)
{
char *dest0 = dest;
asm (PRELOADSTR ("%0") : : "r" (src));
#ifndef __OPTIMIZE_SIZE__
if (((long)src & 3) == ((long)dest & 3))
{
/* Skip unaligned part. */
while ((long)src & 3)
{
if (! (*dest++ = *src++))
return dest0;
}
/* Load two constants:
R4 = 0xfefefeff [ == ~(0x80808080 << 1) ]
R5 = 0x80808080 */
asm ("mov r5, #0x80
ldr r1, [%1, #0]
add r5, r5, #0x8000
add r5, r5, r5, lsl #16
mvn r4, r5, lsl #1
add r3, r1, r5
bic r3, r3, r1
ands r2, r3, r4
bne 1f
0:
ldr r3, [%1, #0]
ldr r1, [%1, #4]!
" PRELOADSTR("%1") "
str r3, [%0], #4
add r2, r1, r4
bic r2, r2, r1
ands r3, r2, r5
beq 0b
1:"
: "=&r" (dest), "=&r" (src)
: "0" (dest), "1" (src)
: "r1", "r2", "r3", "r4", "r5", "memory", "cc");
}
#endif
while (*dest++ = *src++)
asm (PRELOADSTR ("%0") : : "r" (src));
return dest0;
}
#endif