Motorola DSP56600 Manual page 85

Pipeline Interlocks
Program Flow-Control Pipeline Interlocks
6-12 Optimizing DSP56300/DSP56600 Applications
cmp B,x0
blt cont
move
sub x0,b
cont
add b,a
LoopEnd
;efficient version - loop reordered.
;the main point - the CMP and subsequent branch are split between two
;iterations
;execution time of one iteration (condition true): 7 clocks
move X:(r0)+,B
cmp B,x0
DO #(N-1),LoopEnd1
blt <cont
move
sub x0,b
cont
add b,a
move X:(r0)+,B
cmp B,A
LoopEnd1
cmp B,A
blt contin1
move
sub x0,b
cont1
add b,a
;compare to threshold
(r4)+ ;increment counter
;subtract threshold from sum
;read first data to B
;first compare - before loop.
;SR updated in previous loop iteration
(r4)+
;read next data to B
;after SR pop, new CMP is needed.
(r4)+
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