rjmccall added inline comments.

================
Comment at: include/clang/Basic/FixedPoint.h:64
+
+class APFixedPoint {
+ public:
----------------
rjmccall wrote:
> This should get a documentation comment describing the class.  You should 
> mention that, like `APSInt`, it carries all of the semantic information about 
> the value's type (width, signed-ness, saturating-ness, etc.), but by design 
> it does not carry the original C type — among other reasons, so that it can 
> more easily be moved to LLVM should fixed-point types gain native IR support.
Documentation comments start with ///.

Otherwise, these changes look good; LGTM, but of course you should settle 
Bevin's review comments before committing.


Repository:
  rC Clang

https://reviews.llvm.org/D48661



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