Motorola DSP96002 User Manual page 594

B.1.41 64x64 Bit Unsigned Multiply
This performs a double precision unsigned integer multiply. The 64 bit integer is formed by the concatena-
tion of two 32 bit registers.
Let X = A:B and Y = C:D, then X * Y can be written as:
------------------
+
+
+
+ A * C
------------------
= W X Y Z
64x64 Bit Unsigned Multiply
d3:d7:d6:d4 = d0:d1 * d2:d3
mpyu d0,d2,d7
mpyu d0,d3,d5
mpyu d1,d3,d4
mpyu d1,d2,d6
move
add d0,d5
addc d1,d2
inc d3
add d5,d6
addc d2,d7
inc d3
MOTOROLA
A B
* C D
B * D
A * D
B * C
d7.h,d3.l
d4.h,d0.l
d6.h,d2.l
d5.h,d1.l
ifcs
ifcs
DSP96002 USER'S MANUAL
Program ICycles
Words
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
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Totals: 11 11
B-75