12.32 __smusdx intrinsic
This intrinsic inserts an
SMUSDX instruction into the instruction stream generated by the compiler.
you to perform two 16-bit signed multiplications, subtracting one
of the products from the other. The halfwords of the second operand
are exchanged before performing the arithmetic. This produces top
× bottom and bottom × top multiplication.
unsigned int __smusdx(unsigned int
holds the first halfword operands for each multiplication
holds the second halfword operands for each multiplication.
__smusdx intrinsic returns the difference
of the products of the two 16-bit signed multiplications.
unsigned int dual_multiply_prods(unsigned int val1, unsigned int val2)
unsigned int res;
res = __smuad(val1,val2); /* p1 = val1[15:0] × val2[31:16]
p2 = val1[31:16] × val2[15:0]
res[31:0] = p1 - p2