In short-precision, the low-order halves of the Hoat
ing-point registers are ignored and remain unchanged.
TheSUBTRACT NORMALIZED is similar to ADD NORMAL
IZED, except that the sign of the second operand is
inverted before addition.
The sign of the difference is derived by the rules of
algebra. The sign of a difference with zero result
fractionis always positive.
Resulting Condition Code:
o Result fraction is zero
1 Result is less than zero
2 Result is greater than zero
3 Result exponent overHows
Program Interruptions:Operation (if Hoating-point feature is not in-
stalled)
Addressing(SD and SE only)
Specification
Significance
Exponent overHow
Exponent underHow
SubtractUnnormalized SUR RR. (Short Operands)
3F
78 11 12 15SU RX (Short Operands)
7F
7 8 11 12 15161920 SWR (Long Operands)
2F
7 8 11 12 15SW RX (Long Operands)
6F
7 8 11 12 15161920 D2
31
31
The second operand is subtracted from the first op
erand, and the unnormalized difference is placed in
the first operand location.
In short-precision, the low-order halves of the Hoat
ing-point register are ignored and remain unchanged.
46
TheSUBTRACT UNNORMALIZED is similar to ADD UN NORMALIZED, except for the inversion of the sign of the
second operand before addition.
The sign of the difference is derived by the rules of
algebra. The sign of a difference with zero result
fraction is always positive.
Resulting Condition Code:
o Result fraction is zero
1 Result is less than zero
2 Result is greater than zero
3 Result exponent overHows
Program Interruptions:Operation (if Hoating-point feature is not in-
stalled)
Addressing (sw and su only)
Specification
Significance
Exponent overHowCompare CER RR (Short Operands)
39
7 8 11 12 15
CE RX (Short Operands)I 79 Rl I X
2I B2 0 7 8 11 12 1516 1920 CDR RR (Long Operands) I 29 Rl I R2 I 0 78 11 12 15
CD RX (Long Operands)I 69 Rl I X
2I B2 0 7 8 11 12 1516 1920 31
31
The first operand is compared with the second op
erand, and the condition code indicates the result.
In short-precision, the low-order halves of the Hoat
ing-point registers are ignored.
Comparison is algebraic, taking into account the
sign, fraction, and exponent of each number. An expo
nent inequality is not decisive for magnitude determi
nation since the fractions may have different numbers
of leading zeros. An equality is established by follow
ing the rules for normalized Hoating-point subtraction.
When the intermediate sum, including a possible
ing-point registers are ignored and remain unchanged.
The
IZED, except that the sign of the second operand is
inverted before addition.
The sign of the difference is derived by the rules of
algebra. The sign of a difference with zero result
fraction
Resulting Condition Code:
o Result fraction is zero
1 Result is less than zero
2 Result is greater than zero
3 Result exponent overHows
Program Interruptions:
stalled)
Addressing
Specification
Significance
Exponent overHow
Exponent underHow
Subtract
3F
78 11 12 15
7F
7 8 11 12 1516
2F
7 8 11 12 15
6F
7 8 11 12 1516
31
31
The second operand is subtracted from the first op
erand, and the unnormalized difference is placed in
the first operand location.
In short-precision, the low-order halves of the Hoat
ing-point register are ignored and remain unchanged.
46
The
second operand before addition.
The sign of the difference is derived by the rules of
algebra. The sign of a difference with zero result
fraction is always positive.
Resulting Condition Code:
o Result fraction is zero
1 Result is less than zero
2 Result is greater than zero
3 Result exponent overHows
Program Interruptions:
stalled)
Addressing (sw and su only)
Specification
Significance
Exponent overHow
39
7 8 11 12 15
CE RX (Short Operands)
2
CD RX (Long Operands)
2
31
The first operand is compared with the second op
erand, and the condition code indicates the result.
In short-precision, the low-order halves of the Hoat
ing-point registers are ignored.
Comparison is algebraic, taking into account the
sign, fraction, and exponent of each number. An expo
nent inequality is not decisive for magnitude determi
nation since the fractions may have different numbers
of leading zeros. An equality is established by follow
ing the rules for normalized Hoating-point subtraction.
When the intermediate sum, including a possible