/[avr-libc]/avr-libc/libc/string/memcpy.S
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revision 1.5 by joerg_wunsch, Tue Sep 13 13:29:54 2005 UTC revision 1.6 by aesok, Sun Oct 30 19:36:53 2005 UTC
# Line 26  Line 26 
26    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27    POSSIBILITY OF SUCH DAMAGE. */    POSSIBILITY OF SUCH DAMAGE. */
28    
29    /* $Id$ */
30    
31  #include "macros.inc"  #include "macros.inc"
32    
33  #define dest_hi r25  #define dest_hi r25
# Line 51  Line 53 
53          .global _U(memcpy)          .global _U(memcpy)
54          .type   _U(memcpy), @function          .type   _U(memcpy), @function
55  _U(memcpy):  _U(memcpy):
56          LOAD_Z(src_lo, src_hi)          X_movw  ZL, src_lo
57          LOAD_X(dest_lo, dest_hi)          X_movw  XL, dest_lo
58  #if OPTIMIZE_SPEED  #if OPTIMIZE_SPEED
59  ; 15 words, (14 + len * 6 - (len & 1)) cycles  ; 15 words, (14 + len * 6 - (len & 1)) cycles
60          sbrs    len_lo, 0          sbrs    len_lo, 0
61          rjmp    .memcpy_start          rjmp    .L_memcpy_start
62          rjmp    .memcpy_odd          rjmp    .L_memcpy_odd
63  .memcpy_loop:  .L_memcpy_loop:
64          ld      __tmp_reg__, Z+          ld      __tmp_reg__, Z+
65          st      X+, __tmp_reg__          st      X+, __tmp_reg__
66  .memcpy_odd:  .L_memcpy_odd:
67          ld      __tmp_reg__, Z+          ld      __tmp_reg__, Z+
68          st      X+, __tmp_reg__          st      X+, __tmp_reg__
69  .memcpy_start:  .L_memcpy_start:
70          subi    len_lo, lo8(2)          subi    len_lo, lo8(2)
71          sbci    len_hi, hi8(2)          sbci    len_hi, hi8(2)
72  #else  #else
73  ; 11 words, (13 + len * 8) cycles  ; 11 words, (13 + len * 8) cycles
74          rjmp    .memcpy_start          rjmp    .L_memcpy_start
75  .memcpy_loop:  .L_memcpy_loop:
76          ld      __tmp_reg__, Z+          ld      __tmp_reg__, Z+
77          st      X+, __tmp_reg__          st      X+, __tmp_reg__
78  .memcpy_start:  .L_memcpy_start:
79          subi    len_lo, lo8(1)          subi    len_lo, lo8(1)
80          sbci    len_hi, hi8(1)          sbci    len_hi, hi8(1)
81  #endif  #endif
82          brcc    .memcpy_loop          brcc    .L_memcpy_loop
83  ; return dest (unchanged)  ; return dest (unchanged)
84          ret          ret
85  .memcpy_end:  .L_memcpy_end:
86          .size   _U(memcpy), .memcpy_end - _U(memcpy)          .size   _U(memcpy), .L_memcpy_end - _U(memcpy)
87    
88  #endif /* not __DOXYGEN__ */  #endif /* not __DOXYGEN__ */

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