4–28 Alpha Architecture Handbook
4.4.4 Scaled Quadword Add
Format:
Operation:
CASE
S4ADDQ: Rc ← LEFT_SHIFT(Rav,2) + Rbv
S8ADDQ: Rc ← LEFT_SHIFT(Rav,3) + Rbv
ENDCASE
Exceptions:
Instruction mnemonics:
Qualifiers:
Description:
Register Ra is scaled by 4 (for S4ADDQ) or 8 (for S8ADDQ) and is added to register Rb or a
literal, and the 64-bit sum is written to Rc.
On overflow, the least significant 64 bits of the true result are written to the destination
register.
SxADDQ Ra.rq,Rb.rq,Rc.wq
!Operate format
SxADDQ Ra.rq,#b.ib,Rc.wq
!Operate format
None
S4ADDQ Scaled Add Quadword by 4
S8ADDQ Scaled Add Quadword by 8
None