Control Data Cyber 170 State Hardware Reference Manual page 36

Instruction Section
The long-add i n s t r u c t i o n s a r e :
36
I n t e g e r sum of (Xj) and (Xk) t o X i
37 I n t e g e r d i f f e r e n c e of
( X j )
and (Xk) t o X i
CompareIMove Sequence
The compare/move sequence c o n t r o l s d a t a manipulation on a c h a r a c t e r b a s i s .
The compare/move i n s t r u c t i o n s ( a l s o r e f e r r e d t o a s CMU i n s t r u c t i o n s ) a r e
60-bit i n s t r u c t i o n s t h a t use s i x support r e g i s t e r s f o r source and r e s u l t f i e l d
CM a d d r e s s e s and c h a r a c t e r p o s i t i o n o f f s e t s . The support r e g i s t e r s load from
t h e 60-bit i n s t r u c t i o n word. The compare/move i n s t r u c t i o n s a r e :
464 Move i n d i r e c t (Bj)
+
K
I M B j
+
K
465
Move d i r e c t DM
466 Compare c o l l a t e d CC
467 Compare u n c o l l a t e d CU
The support r e g i s t e r s a r e :
a
An 18-bit
l U
r e g i s t e r t h a t s p e c i f i e s which r e l a t i v e CM a d d r e s s word
c o n t a i n s t h e f i r s t c h a r a c t e r of t h e source d a t a f i e l d .
An 18-bit K 2 r e g i s t e r t h a t s p e c i f i e s which r e l a t i v e CM
a d d r e s s word
c o n t a i n s t h e f i r s t c h a r a c t e r of t h e r e s u l t f i e l d .
A
&-bit C 1 r e g i s t e r t h a t s p e c i f i e s t h e c h a r a c t e r p o s i t i o n o r o f f s e t of
t h e f i r s t CM word of t h e source f i e l d .
A 4-bit C 2 r e g i s t e r t h a t s p e c i f i e s t h e c h a r a c t e r p o s i t i o n o r o f f s e t of
t h e f i r s t CM word of t h e r e s u l t f i e l d .
Two 16-bit L r e g i s t e r s (LA and LC) t h a t s p e c i f y t h e number of c h a r a c t e r s
i n t h e d a t a f i e l d . The LA r e g i s t e r i s a s s o c i a t e d with K1, and t h e LC
r e g i s t e r i s a s s o c i a t e d with K2. I n s t r u c t i o n 464 u s e s 14 r e g i s t e r b i t s .
I n s t r u c t i o n s 465, 4 6 6 , and 467 use only t h e lower 8 r e g i s t e r b i t s .
NOTE
CMU i n s t r u c t i o n s a r e provided f o r c o m p a t i b i l i t y
with previous systems. For b e t t e r performance
,
recompile jobs t o avoid use of CMU i n s t r u c t i o n s .