/[avr-libc]/avr-libc/libc/string/memset.S
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revision 1.6 by joerg_wunsch, Tue Sep 13 13:29:54 2005 UTC revision 1.7 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 50  Line 52 
52          .global _U(memset)          .global _U(memset)
53          .type   _U(memset), @function          .type   _U(memset), @function
54  _U(memset):  _U(memset):
55          LOAD_X(dest_lo, dest_hi)          X_movw  XL, dest_lo
56  #if OPTIMIZE_SPEED  #if OPTIMIZE_SPEED
57  ; 11 words, (12 + len * 4 - (len & 1)) cycles  ; 11 words, (12 + len * 4 - (len & 1)) cycles
58          sbrs    len_lo, 0          sbrs    len_lo, 0
59          rjmp    .memset_start          rjmp    .L_memset_start
60          rjmp    .memset_odd          rjmp    .L_memset_odd
61  .memset_loop:  .L_memset_loop:
62          st      X+, val_lo          st      X+, val_lo
63  .memset_odd:  .L_memset_odd:
64          st      X+, val_lo          st      X+, val_lo
65  .memset_start:  .L_memset_start:
66          subi    len_lo, lo8(2)          subi    len_lo, lo8(2)
67          sbci    len_hi, hi8(2)          sbci    len_hi, hi8(2)
68  #else  #else
69  ; 8 words, (11 + len * 6) cycles  ; 8 words, (11 + len * 6) cycles
70          rjmp    .memset_start          rjmp    .L_memset_start
71  .memset_loop:  .L_memset_loop:
72          st      X+, val_lo          st      X+, val_lo
73  .memset_start:  .L_memset_start:
74          subi    len_lo, lo8(1)          subi    len_lo, lo8(1)
75          sbci    len_hi, hi8(1)          sbci    len_hi, hi8(1)
76  #endif  #endif
77          brcc    .memset_loop          brcc    .L_memset_loop
78  ; return dest (unchanged)  ; return dest (unchanged)
79          ret          ret
80  .memset_end:  .L_memset_end:
81          .size   _U(memset), .memset_end - _U(memset)          .size   _U(memset), .L_memset_end - _U(memset)
82    
83  #endif /* not __DOXYGEN__ */  #endif /* not __DOXYGEN__ */

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