4.4.10. UMAAL

Unsigned Multiply Accumulate Accumulate Long.


UMAAL{cond} RdLo, RdHi, Rn, Rm



is an optional condition code (see Conditional execution).

RdLo, RdHi

are the destination registers for the 64-bit result. They also hold the two 32-bit accumulate operands. RdLo and RdHi must be distinct registers.

Rn, Rm

are the registers holding the multiply operands.

Do not use r15 for any of RdLo, RdHi, Rn, or Rm.


The UMAAL instruction multiplies the 32-bit values in Rn and Rm, adds the two 32-bit values in RdHi and RdLo, and stores the 64-bit result to RdLo, RdHi.

Condition flags

This instruction does not change the flags.


This ARM instruction is available in ARMv6 and above.

These 32-bit Thumb instructions are available in ARMv6T2 and above, except the ARMv7-M profile.

There is no 16-bit Thumb version of this instruction.


    UMAAL       r8, r9, r2, r3
    UMAALGE     r2, r0, r5, r3
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