12.50 __uqasx intrinsic
This intrinsic inserts a
UQASX instruction into the instruction stream generated by the compiler.
you to exchange the halfwords of the second operand and perform
one unsigned 16-bit integer addition and one unsigned 16-bit subtraction,
saturating the results to the 16-bit unsigned integer range 0 ≤ x ≤
216 - 1.
unsigned int __uqasx(unsigned int
, unsigned int
holds the first two halfword operands
holds the second two halfword operands.
__uqasx intrinsic returns:
The subtraction of the high halfword in the second
operand from the low halfword in the first operand, in the low halfword
of the return value.
The 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.
The results are saturated to the 16-bit unsigned integer range
0 ≤ x ≤ 216 - 1.
unsigned int exchange_add_subtract(unsigned int val1, unsigned int val2)
unsigned int res;
res = __uqasx(val1,val2); /* res[15:0] = val1[15:0] - val2[31:16]
res[31:16] = val1[31:16] + val2[15:0]