Cray CRAY-1 - Page 145

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If

(Ak)

> 128, the

result

is

all

zeros~

If

(Ak)

> 64, the

result

register

contains

(Ak)

-

64

zeros.

Example:

Suppose

that

a

153

instruction

is

to

be

executed

and

the following

register

conditions

exist:

(VL)

= 4

(A6) = 3

(Element

0)

of V

2

= a

00000

0000 0000 0000

0017

(Element

1)

of V

2

= a

60000

0000 0000

0000

0006

(Element

2)

of V

2

= 1

00000

0000

0000

0000

0006

(Element

3)

of V

2

= 1

60000

0000 0000 0000

0007

Instruction

153026

is

executed

and

following execution,

register

Vo

contains the following values:

(Element

0)

of

Vo

= a

00000

0000 0000

0000

0001

(Element

1)

of

Vo

= 1

66000

0000 0000

0000

0000

(Element

2)

of

Vo

= 1

50000

0000

0000

0000 0000

(Element

3)

of

Vo

= 1

56000

0000 0000

0000

0000

The

remaining elements of

Vo

are unaltered.

Hold

issue conditions

034

-

037

in process

Exchange

in process

Vi

or

Vj

reserved

Ak

reserved

150

-

153

in process,

unit

busy

(VL)

+ 4

CPs

Execution time

Instruction issue 1

CP

Vi

ready

11

CPs

if

(VL)

~

5

Vi

ready

(VL)

+ 6

CPs

if

(VL)

> 5

2240004

4-59

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