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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 |
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POSSIBILITY OF SUCH DAMAGE. */ |
POSSIBILITY OF SUCH DAMAGE. */ |
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/* $Id$ */ |
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#include "macros.inc" |
#include "macros.inc" |
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|
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#define dest_hi r25 |
#define dest_hi r25 |
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.global _U(memset) |
.global _U(memset) |
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.type _U(memset), @function |
.type _U(memset), @function |
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_U(memset): |
_U(memset): |
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LOAD_X(dest_lo, dest_hi) |
X_movw XL, dest_lo |
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#if OPTIMIZE_SPEED |
#if OPTIMIZE_SPEED |
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; 11 words, (12 + len * 4 - (len & 1)) cycles |
; 11 words, (12 + len * 4 - (len & 1)) cycles |
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sbrs len_lo, 0 |
sbrs len_lo, 0 |
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rjmp .memset_start |
rjmp .L_memset_start |
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rjmp .memset_odd |
rjmp .L_memset_odd |
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.memset_loop: |
.L_memset_loop: |
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st X+, val_lo |
st X+, val_lo |
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.memset_odd: |
.L_memset_odd: |
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st X+, val_lo |
st X+, val_lo |
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.memset_start: |
.L_memset_start: |
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subi len_lo, lo8(2) |
subi len_lo, lo8(2) |
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sbci len_hi, hi8(2) |
sbci len_hi, hi8(2) |
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#else |
#else |
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; 8 words, (11 + len * 6) cycles |
; 8 words, (11 + len * 6) cycles |
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rjmp .memset_start |
rjmp .L_memset_start |
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.memset_loop: |
.L_memset_loop: |
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st X+, val_lo |
st X+, val_lo |
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.memset_start: |
.L_memset_start: |
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subi len_lo, lo8(1) |
subi len_lo, lo8(1) |
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sbci len_hi, hi8(1) |
sbci len_hi, hi8(1) |
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#endif |
#endif |
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brcc .memset_loop |
brcc .L_memset_loop |
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; return dest (unchanged) |
; return dest (unchanged) |
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ret |
ret |
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.memset_end: |
.L_memset_end: |
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.size _U(memset), .memset_end - _U(memset) |
.size _U(memset), .L_memset_end - _U(memset) |
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#endif /* not __DOXYGEN__ */ |
#endif /* not __DOXYGEN__ */ |