IBM System/360 Field Engineering Manual

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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

IBM System/360 Specifications

General

Brand	IBM
Model	System/360
Category	Desktop
Language	English