Cray CRAY-1 - Shift, Mask Format; Immediate Constant Format; Format for Arithmetic and Logical Instructions

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l

,

OPERATION

CODE

J

RESULT

REG.

OPERAND

REG.

OPERAND

REG.

16

BITS

ARITHMETIC,

LOGICAL

Figure 4-2.

Format

for arithmetic

and

logical

instructions

SHIFT,

MASK

FORMAT

The

shift

and

mask

instructions

consist of a

7-bit

operation

code

(gh)

followed

by

a

3-bit

field

and

a

6-bit

field.

The

3-bit

i

field

desig-

nates the

result

and

operand

registers.

The

6-bit

combined

jk

field

specifies

a

shift

or

mask

count. This format

is

illustrated

in figure 4-3.

OPERATION

CODE

OPERAND

AND

RESULT

REG.

j k

6

SHIFT,

MASK

COUNT

16

81TS

SHIFT,

MASK

Figure 4-3.

Format

for

shift

and

mask

instructions

IMMEDIATE

CONSTANT

FORMAT

The

instructions

that

enter immediate constants into A

registers

have

either

a one-parcel or a two-parcel

form.

Only

the two-parcel

form

exists

for entering immediate constants into S

registers.

For

the one-parcel

form,

the j

and

k

fi

e 1

ds

are

combi

ned

to

gi

ve

a 6-bi t quanti

ty.

For

the

2240004

4-2

E

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