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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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#define src_hi r25 |
#define src_hi r25 |
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.global _U(strlen_P) |
.global _U(strlen_P) |
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.type _U(strlen_P), @function |
.type _U(strlen_P), @function |
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_U(strlen_P): |
_U(strlen_P): |
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LOAD_Z(src_lo, src_hi) |
X_movw ZL, src_lo |
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.strlen_P_loop: |
.L_strlen_P_loop: |
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LPM_R0_ZP |
LPM_R0_ZP |
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tst r0 |
tst r0 |
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brne .strlen_P_loop |
brne .L_strlen_P_loop |
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; return Z - 1 - src = (-1 - src) + Z = ~src + Z |
; return Z - 1 - src = (-1 - src) + Z = ~src + Z |
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com src_lo |
com src_lo |
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com src_hi |
com src_hi |
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add src_lo, ZL |
add src_lo, ZL |
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adc src_hi, ZH |
adc src_hi, ZH |
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ret |
ret |
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.strlen_P_end: |
.L_strlen_P_end: |
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.size _U(strlen_P), .strlen_P_end - _U(strlen_P) |
.size _U(strlen_P), .L_strlen_P_end - _U(strlen_P) |
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#endif /* not __DOXYGEN__ */ |
#endif /* not __DOXYGEN__ */ |