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.
152
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