Subtract Normalized
(SER)
(SE)
(SDR)
(SD)
General Description
Format
(RR
Short)
(RX Short)
(RR
Long)
(RX Long)
Condition
Code
Interrupt
Action
Floating-Point Instructions
• The operand specified by the second address
(R
2
or
X
2
/B
2
/D
2
)
is sub-
tracted from
the
operand in
the
floating-point register specified by
the
first
address
(R
1
).
The normalized difference is loaded into the register specified
by
the
first address. The sign and magnitude of the difference determine
the
condition code.
o
7 8 11 12 15
o
7 8 11 12 15 16 19 20
o 7 8 11 12 15
o 7 8 11 12 15 16 19 20
• 0 - result mantissa is zero.
1-
result mantissa is less
than
zero.
2 - result mantissa is
greater
than
zero.
3 - result exponent overflows.
• Address
error:
Addressing (RX
format).
Specification.
Significance error.
Exponent overflow.
Exponent underflow.
31
31
Notes • 1. The
Subtract
Normalized is
the
same
as
the
Add Normalized, except
that
the
sign
of
the second operand is changed to
the
opposite value
before addition. A zero difference is always positive.
213
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