RCA 70/46 - (ContD) Shift Left Single (SLA)

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Shift Left Single

(SLA)

General

Description

Format

(RS)

Condition Code

Interrupt

Action

Notes

Fixed-Point

Instructions

•

The

integer

portion

of

the

operand in

the

general

register

specified by

the

first

address

(R

1

)

is

shifted

left

the

number

of

positions specified

by

the

second

address

(BdD

2

).

The second

address

is

used

as

a

count

and

not

to

address

data.

The low-order six

bits

of

the

second

address

constitute

the

count. The

remaining

bits

are

ignored.

8B

o

7 8

11 12

15

16

19

20

31

• 0 -

result

is zero.

1 -

result

is less

than

zero.

2 -

result

is

greater

than

zero.

3 - overflow.

• Fixed-point overflow.

• 1. All

31

bit

positions

of

the

integer

are

shifted.

The

sign

is not altered.

Zeros

are

inserted

in

the

right-hand

end

of

the

operand

for

each

shift.

2.

If

a

bit

is

shifted

out

of

the

left-hand end

that

is not identical to

the

sign bit, a fixed-point overflow condition exists.

150

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