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Unsigned Multiply Accumulate Accumulate Long.


UMAAL{cond} RdLo, RdHi, Rn, Rm



is an optional condition code.

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 different registers.

Rn, Rm

are the registers holding the multiply operands.


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.

Register restrictions

You cannot use PC for any register.

You can use SP in ARM instructions but these are deprecated in ARMv6T2 and above. You cannot use SP in Thumb instructions.

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. For the ARMv7-M architecture, they are only available in an ARMv7E-M implementation.

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


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

See also

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