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13.131 SMUSD

Dual 16-bit Signed Multiply with Subtraction of products, and optional exchange of operand halves.


SMUSD{X}{cond} {Rd}, Rn, Rm



is an optional parameter. If X ispresent, the most and least significant halfwords of the secondoperand are exchanged before the multiplications occur.


is an optional condition code.


is the destination register.

Rn, Rm

are the registers holding the operands.


SMUSD multiplies the bottom halfwordof Rn with the bottom halfword of Rm,and the top halfword of Rn withthe top halfword of Rm. It thensubtracts the second product from the first, and stores the differenceto Rd.

Register restrictions

You cannot use PC for any operand.

You can use SP in A32 instructions but this is deprecated. You cannot use SP in T32 instructions.


The 32-bit instruction is available in A32 and T32.

There is no 16-bit version of this instruction in T32.


    SMUSDXNE    r0, r1, r2

Related reference

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