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__uhadd16 intrinsic

This intrinsic inserts a UHADD16 instruction into the instruction stream generated by the compiler. It enables you to perform two unsigned 16-bit integer additions, halving the results.

unsigned int __uhadd16(unsigned int val1, unsigned int val2)

Where:

val1

holds the first two 16-bit summands

val2

holds the second two 16-bit summands.

The __uhadd16 intrinsic returns:

  • the halved addition of the low halfwords in each operand, in the low halfword of the return value

  • the halved addition of the high halfwords in each operand, in the high halfword of the return value.

Example:

unsigned int add_halfwords_then_halve(unsigned int val1, unsigned int val2)
{
  unsigned int res;

    res = __uhadd16(val1,val2); /* res[15:0] = (val1[15:0] + val2[15:0]) >> 1
                                   res[31:16] = (val1[31:16] + val2[31:16]) >> 1
                                 */
    return res;
}

See also