Cray CRAY-1 - 011 I J Km; Branch to Ijkm if (Ao) to

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r-------------------------------------------------------------------

010ijkm

Branch

to

ijkm

if

(A

0)

=

0

011

i j

km

Branch

to i j

km

if

(A

0)

~

0

012i

j

km

Branch

to

ijkm

if

(,AIO)

positive

013i

j

km

Branch

to

ijkm

if

(Ao)

negative

These

two-parcel

instructions

test

the contents of

Ao

for the

condition

specified

by

the h

field.

If

the condition

is

satisfied,

the P

register

is

set

to the parcel address specified

by

the

low

order

22

bits

of the ijkm

field

and

execution continues

at

that

address.

The

high

order

bit

of the

ijkm

field

is

ignored.

If

the condition

is

not

satisfied,

execution continues with the

instruction

following the

branch

instruction.

Hold

issue conditions

034

-

037

in process

Exchange

in process

Ao

busy

in

last

2

CPs

Execution time

Instructibn 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

Both

parcels of branch in the

same

buffer

and

branch not taken 2

CPs

Both

parcels of branch in

different

buffers

and

branch not taken 4

CPs

Second

parcel of branch not in a buffer

and

branch not taken

13

CPs

Special cases

(Ao)

= 0

is

considered a

positive

condition

2240004

4-19

E

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