12.31 __smusd intrinsic
This intrinsic inserts an
SMUSD instruction into the instruction stream generated by the compiler.
you to perform two 16-bit signed multiplications, taking the difference
of the products by subtracting the high halfword product from the
low halfword product.
unsigned int __smusd(unsigned int
holds the first halfword operands for each multiplication
holds the second halfword operands for each multiplication.
__smusd 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[15:0]
p2 = val1[31:16] × val2[31:16]
res[31:0] = p1 - p2