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Instruction Descriptions 4–39
4.4.15 Quadword Subtract
Format:
Operation:
Rc ← Rav - Rbv
Exceptions:
Instruction mnemonics:
Qualifiers:
Description:
Register Rb or a literal is subtracted from register Ra and the 64-bit difference is written to reg-
ister Rc. On overflow, the least significant 64 bits of the true result are written to the
destination register.
The unsigned compare instructions can be used to generate borrow. If the minuend (Rav) is
less unsigned than the subtrahend (Rbv), a borrow will occur.
SUBQ Ra.rq,Rb.rq,Rc.wq
!Operate format
SUBQ Ra.rq,#b.ib,Rc.wq
!Operate format
Integer Overflow
SUBQ Subtract Quadword
Integer Overflow Enable (/V)