12.19 __shsub16 intrinsic
This intrinsic inserts a
SHSUB16 instruction into the instruction stream generated by the compiler.
you to perform two signed 16-bit integer subtractions, halving the
unsigned int __shsub16(unsigned int
, unsigned int
holds the first halfword operands
holds the second halfword operands.
__shsub16 intrinsic returns:
The halved subtraction of the low halfword in the
second operand from the low halfword in the first operand, in the
low halfword of the return value.
The halved subtraction of the high halfword in the
second operand from the high halfword in the first operand, in the
high halfword of the return value.
unsigned int add_and_halve(unsigned int val1, unsigned int val2)
unsigned int res;
res = __shsub16(val1,val2); /* res[15:0] = (val1[15:0] - val2[15:0]) >> 1
res[31:16] = (val1[31:16] - val2[31:16]) >> 1