Cray CRAY-1 - 020 Ijkm Transmit Jkm to Ai; 021 I J Km

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020ijkm

Transmit

jkm

to

Ai

021ijkm

Transmit

complement

of

jkm

to

Ai

The

020

instruction

enters into

Ai

a 24-bit value

that

is

composed

of

the 22-bit

jkm

field

and

two

upper

bits

of zero.

The

021

instruction

enters into

Ai

a 24-bit value

that

is

the

complement

of a value

formed

by

the 22-bit

jkm

field

and

two

upper

bits

of zero.

The

complement

is

formed

by

changing

all

one

bits

to zero

and

all

zero

bits

to

one. Thus, for the

021

instruction,

the upper

two

bits

of

Ai

are

set

to

one

and

the

instruction

provides a

means

of entering a negative value into Ai.

The

instructions

are both two-parcel

instructions.

Hold

issue conditions

034

-

037

in process

Exchange

in process

A

register

access

conflict

Ai

reserved

Execution

time

Instruction issue:

Both

parcels in

same

buffer

Parcels in

different

buffers

Second

parcel not in a buffer

Ai

ready 1

CP

Special cases

None

2

CPs

4

CPs

13

CPs

2240004

4-21

E

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