This intrinsic inserts a
REV instruction or an
equivalent code sequence into the instruction stream generated by
the compiler. It enables you to convert a 32-bit big-endian data
value into a little-endian data value, or a 32-bit little-endian
data value into a big-endian data value from within your C or C++
__rev intrinsic is available irrespective
of the target processor or architecture you are compiling for. However,
REV instruction is not available on the target,
the compiler compensates with an alternative code sequence that
could increase the number of instructions, effectively expanding
the intrinsic into a function.
The compiler introduces
REV automatically when
it recognizes certain expressions.