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Instruction Descriptions 4–35
4.4.11 Quadword Multiply
Format:
Operation:
Rc ← Rav * Rbv
Exceptions:
Instruction mnemonics:
Qualifiers:
Description:
Register Ra is multiplied by register Rb or a literal and the 64-bit product is written to register
Rc. Overflow detection is based on considering the operands and the result as signed quanti-
ties. On overflow, the least significant 64 bits of the true result are written to the destination
register.
The UMULH instruction can be used to generate the upper 64 bits of the 128-bit result when
an overflow occurs.
MULQ Ra.rq,Rb.rq,Rc.wq
!Operate format
MULQ Ra.Rq,#b.ib,Rc.wq
!Operate format
Integer Overflow
MULQ Multiply Quadword
Integer Overflow Enable (/V)