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