Cray CRAY-1 - Page 104

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007ijkm Return

ju~p

to ijkm;

set

Boo

to

(P)

This two-parcel

instruction

sets

register

Boo

to the address of the

follovling parcel.

The

r

resister

is

then

set

to the parcel address

specified

by

the

low

order

22

bits

of the ijkm

field.

Execution

continues

at

that

address.

The

high order

bit

of the

ijkm

field

~s

igncred.

The

purpose of

this

instruction

is

to provide a return

linkage for subroutine

calls.

The

subroutine

is

entered via a

return

jump.

The

subroutine returns to the

caller

at

the

instruction

fo

11

ov/;

ng

the

c2.11

by execut i

n9

a branch to the contents of a

B

register.

Ho

1 d issue

,condi

ti.9~

034 -

037

;n process

Exchange

in process

Execution time

Instruction issue:

Both

parcels

of

branch in the

same

buffer

and

branch address

in a buffer

5

CPs

Both

parcels

of

branch in the

same

buffer

and

branch address

not in a buffer

14

CPs

Both

parcels of branch in

different

buffers

and

branch

address in a buffer 7

CPs

Both

parcels

of

branch in

different

buffers

and

branch

address not in a buffer

16

CPs

Second

parcel of branch not in a buffer

and

branch address

in a buffer

16

CPs

Second

parcel

of

branch not in a buffer

and

branch address

not in a buffer

25

CPs

Special cases

None

2240004

4-18

E

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