IBM System/360 Field Engineering Manual page 25

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Operation
Subtract Normalized
(Long)
Subtract Normalized
(Short)
Subtract Normalized
(Short)
Subtract
Unnormalized (Long)
Subtract
Unnormalized (Long)
Subtract
Unnormalized (Short)
Mnemonic
Op Code Format
Operands
NSDR 2B RR Rl,R2
NSE
7B RX Rl,D2(X2,B2)
NSER
3B RR Rl,R2
SW 6F RX Rl,D2(X2,B2)
SWR 2F RR Rl,R2
SU
7F
RX Rl, D2(X2, B2)
Description Interruptions
Cond Code
FP. Subtract opr 2 from opr 1 Spec Result
(FPR) (FPR)
Sign 0 Fract
=
0
(The sign of opr 2 is inverted before the 1 Result <
0
addition.)
2
Result
>
0
3 Exp Oflo
FP. Subtract opr 2 from opr 1
Adr
0
Result
(The sign of opr 2 is inverted before the
Spec Fract
=
0
addition.) Sign 1 Result< O
(Low-order FPR ignored and unchanged Exp Oflo 2 Result > 0
Exp Uflo 3 Exp Oflo
Subtract opr 2 from opr 1 Spec
Result
(The sign of opr 2 is inverted before the Sign 0 Fract = 0
addition.) Exp Oflo 1 Result
<
0
(Low-order FPRs ignored and unchanged) Exp Uflo 2 Result > 0
3 Exp O!lo
FP. Subtract opr 2 from opr 1
Adr 0 Result
(Sto) (FPR) Spec Fract
=
0
Sign 1 Result < 0
Exp O!lo 2
Result > O
3 Exp Oflo
FP. Subtract opr 2 from opr 1
Spec 0 Result
(FPR) Sign Fract
=
O
Exp O!lo 1
Result < 0
2 Result
>
0
3 Exp Oflo
FP. Subtract opr 2 from opr 1 Adr 0 Result
(Sto) (FPR)
Spec
Fract
=
0
(Low-order FPR ignored and unchanged) Sign 1 Result< 0
Exp Oflo 2
Result > 0
3 Exp Oflo