UMAAL Unsigned Multiply Accumulate Accumulate Long Unsigned Multiply Accumulate Accumulate Long multiplies two unsigned 32-bit values to produce a 64-bit value, adds two unsigned 32-bit values, and writes the 64-bit result to two registers. For more information about the constrained unpredictable behavior of this instruction, see Architectural Constraints on UNPREDICTABLE behaviors. If CPSR.DIT is 1, this instruction has passed its condition execution check, and does not use R15 as either its source or destination: The execution time of this instruction is independent of:The values of the data supplied in any of its registers.The values of the NZCV flags. The response of this instruction to asynchronous exceptions does not vary based on:The values of the data supplied in any of its registers.The values of the NZCV flags. It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) . != 1111 0 0 0 0 0 1 0 0 1 0 0 1 UMAAL{<c>}{<q>} <RdLo>, <RdHi>, <Rn>, <Rm> dLo = UInt(RdLo); dHi = UInt(RdHi); n = UInt(Rn); m = UInt(Rm); if dLo == 15 || dHi == 15 || n == 15 || m == 15 then UNPREDICTABLE; if dHi == dLo then UNPREDICTABLE; dHi == dLo 1 1 1 1 1 0 1 1 1 1 1 0 0 1 1 0 UMAAL{<c>}{<q>} <RdLo>, <RdHi>, <Rn>, <Rm> dLo = UInt(RdLo); dHi = UInt(RdHi); n = UInt(Rn); m = UInt(Rm); if dLo == 15 || dHi == 15 || n == 15 || m == 15 then UNPREDICTABLE; // Armv8-A removes UNPREDICTABLE for R13 if dHi == dLo then UNPREDICTABLE; dHi == dLo <c> See Standard assembler syntax fields. <q> See Standard assembler syntax fields. <RdLo> Is the general-purpose source register holding the first addend and the destination register for the lower 32 bits of the result, encoded in the "RdLo" field. <RdHi> Is the general-purpose source register holding the second addend and the destination register for the upper 32 bits of the result, encoded in the "RdHi" field. <Rn> Is the first general-purpose source register holding the multiplicand, encoded in the "Rn" field. <Rm> Is the second general-purpose source register holding the multiplier, encoded in the "Rm" field. if ConditionPassed() then EncodingSpecificOperations(); result = UInt(R[n]) * UInt(R[m]) + UInt(R[dHi]) + UInt(R[dLo]); R[dHi] = result<63:32>; R[dLo] = result<31:0>;