Shift Left Double (Slda) - RCA 70/46 Reference Manual

Shift Left Double
(SLDA)
General Description
Format
(RS)
Condition Code
Interrupt Action
Fixed-Point
InstructiO'nS
• The integer portion of the double-word operand specified by the first
address (R
1 )
and the first address plus one is shifted left the number of
positions specified by the second address (B
2
/D
2 ) .
The first address (R
1 )
specifies an even-numbered register of an even/odd pair that contains the
63-bit integer to be shifted. The second address is used as a count and not
to
address data. The low-order six bits of the second address field constitute
the count. The remaining bits are ignored.
8F
o
7 8 11 12 16 16
• 0 - result is zero.
1 - result is less than zero.
2 - result is greater than zero.
3 - overflow.
• Fixed-point overflow.
Address error:
Specification.
19 20
31
Notes •
1.
All 63 bit positions of the integer are shifted. The sign bit (posi-
tion 0) in the even register is not altered. Zeros are inserted in the
right-hand end of the double-word 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.
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