B-116
DSP96002 USER’S MANUAL
MOTOROLA
B.1.47
Evaluation of EXP2(x)
Floating-point evaluation of exp2(x) can be performed by representing x as i+f where f is the fractional part
and i is the greatest integer in x that does not exceed x. Then, exp2(i+f) = exp2(f)*(2**i). After extracting
the fractional part f, exp2(f) can be evaluated with a polynomial. By scaling by the integer part, exp2(x)
results. Various execution speeds and accuracies may be determined by using different order polynomi-
als.
page 132,60,1,1
org x:0
polyc
dc -0.5770606e-03 ;**8
dc 0.2093549e-02 ;**7
dc -.02777411e-02 ;**6
dc 0.3357901e-02 ;**5
dc 0.8940958e-02 ;**4
dc 0.5558203e-01 ;**3
dc 0.200 ;**2
dc 0.600 ;**1
dc 0.101 ;**0
org p:$100
;
; calculate d2=exp2(d0)
;
Program
ICycles
Words
floor d0,d7 #polyc,r0 2 2
fsub.x d7,d0 1 1
fclr d2 x:(r0)+,d1.s 1 1
int d7 1 1
do #9,_log2sig 2 3
fmpy.x d2,d0,d2 d7.l,d7.h 1 1
fadd.x d1,d2 x:(r0)+,d1.s 1 1
_log2sig
fscale.s d7,d2 1 1
--- ---
Totals: 10 27
Summary of Contents for DSP96002
Page 3: ...1 2 DSP96002 USER S MANUAL MOTOROLA ...
Page 38: ...MOTOROLA DSP96002 USER S MANUAL 3 15 Figure 3 4 Modulo Arithmetic Unit Block Diagram ...
Page 39: ...3 16 DSP96002 USER S MANUAL MOTOROLA ...
Page 53: ...4 14 DSP96002 USER S MANUAL MOTOROLA ...
Page 76: ...MOTOROLA DSP96002 USER S MANUAL 5 23 Figure 5 8 Address Modifier Summary ...
Page 86: ...6 10 DSP96002 USER S MANUAL MOTOROLA ...
Page 101: ...MOTOROLA DSP96002 USER S MANUAL 7 15 Figure 7 9 HI Block Diagram One Port ...
Page 140: ...7 54 DSP96002 USER S MANUAL MOTOROLA ...
Page 166: ...9 10 DSP96002 USER S MANUAL MOTOROLA ...
Page 181: ...MOTOROLA DSP96002 USER S MANUAL 10 15 Figure 10 8 Program Address Bus FIFO ...
Page 337: ...MOTOROLA DSP96002 USER S MANUAL A 149 ...
Page 404: ...A 216 DSP96002 USER S MANUAL MOTOROLA PC xxxx D ...
Page 460: ...A 272 DSP96002 USER S MANUAL MOTOROLA SIOP Not affected ...
Page 484: ...A 296 DSP96002 USER S MANUAL MOTOROLA SSH PC SSL SR SP 1 SP ...
Page 519: ...MOTOROLA DSP96002 USER S MANUAL A 331 ...
Page 718: ...MOTOROLA DSP96002 USER S MANUAL B 199 ...
Page 871: ... MOTOROLA INC 1994 MOTOROLA TECHNICAL DATA SEMICONDUCTOR M Addendum ...
Page 888: ...MOTOROLA INDEX 1 INDEX ...
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