_SmulAddPack_2SW_ACC (Windows Embedded CE 6.0)

1/5/2010

This ARM XScale instruction performs two 16x16 signed multiplication on packed half word data and accumulates these to a single 40-bit accumulator.

Syntax

void _SmulAddPack_2SW_ACC(
  int Arg1,
  int Arg2
);

None.

First, this instruction multiplies the lower 16 bits of the value in Rm with the lower 16 bits of the value in Rs.

It then performs a multiplication with the upper 16 bits of Rs and Rm.

The instruction sign-extends both signed 32-bit products and then adds them to the value in the 40-bit accumulator (acc0).

The compiler translates this instruction into the miaph assembly instruction.