UMADDL Unsigned multiply-add long This instruction multiplies two 32-bit register values, adds a 64-bit register value, and writes the result to the 64-bit destination register. This instruction is a data-independent-time instruction as described in About PSTATE.DIT. This instruction is used by the alias UMULL Ra == '11111' See below for details of when the alias is preferred. 1 0 0 1 1 0 1 1 1 0 1 0 UMADDL <Xd>, <Wn>, <Wm>, <Xa> let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let a : integer{} = UInt(Ra); <Xd> Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. <Wn> Is the 32-bit name of the first general-purpose source register holding the multiplicand, encoded in the "Rn" field. <Wm> Is the 32-bit name of the second general-purpose source register holding the multiplier, encoded in the "Rm" field. <Xa> Is the 64-bit name of the third general-purpose source register holding the addend, encoded in the "Ra" field. Alias Conditions let operand1 : bits(32) = X{}(n); let operand2 : bits(32) = X{}(m); let operand3 : bits(64) = X{}(a); let result : integer = UInt(operand3) + (UInt(operand1) * UInt(operand2)); X{64}(d) = result[63:0]; 2026-03-12 12:23:09 2025-09_rel_asl1