Dual 16-bit Signed Multiply with Addition of products and 64-bit Accumulation.
is an optional parameter. If X is present, the most and least significant halfwords of the second operand are exchanged before the multiplications occur.
is an optional condition code.
are the destination registers for the 64-bit result. They also hold the 64-bit accumulate operand.
RdLomust be different registers.
are the general-purpose registers holding the operands.
SMLALD multiplies the bottom halfword of
Rn with the bottom
Rm, and the top halfword of
Rn with the
top halfword of
Rm. It then adds both products to the value in
RdHi and stores the sum to
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.
This instruction does not change the flags.
The 32-bit instruction is available in A32 and T32.
For the Arm®v7‑M architecture, the 32-bit T32 instruction is only available in an Armv7E-M implementation.
There is no 16-bit version of this instruction in T32.
SMLALD r10, r11, r5, r1