12.45 __uhsax intrinsic
This intrinsic inserts a
UHSAX instruction into the instruction stream generated by the compiler.
you to exchange the halfwords of the second operand, subtract the
high halfwords and add the low halfwords, halving the results.
unsigned int __uhsax(unsigned int
, unsigned int
holds the first operand for the addition in the
low halfword, and the first operand for the subtraction in the high
holds the second operand for the addition in the
high halfword, and the second operand for the subtraction in the
__uhsax intrinsic returns:
The halved addition of the high halfword in the
second operand and the low halfword in the first operand, in the
low halfword of the return value.
The halved subtraction of the low halfword in the
second operand from the high halfword in the first operand, in the
high halfword of the return value.
unsigned int exchange_subtract_add(unsigned int val1, unsigned int val2)
unsigned int res;
res = __uhsax(val1,val2); /* res[15:0] = (val1[15:0] + val2[31:16]) >> 1
res[31:16] = (val1[31:16] - val2[15:0]) >> 1