[PATCH] D57219: [Fixed Point Arithmetic] Fixed Point Comparisons

[Bevin Hansson via Phabricator via cfe-commits]

ebevhan added inline comments.


================
Comment at: clang/test/Frontend/fixed_point_comparisons.c:56
+
+void TestComparisons() {
+  short _Accum sa;
----------------
leonardchan wrote:
> ebevhan wrote:
> > Missing saturating and saturating/non-saturating comparisons. I'd like to see the differences between unsigned padding and not there, if there are any.
> I don't think there should be since we compare by converting to a common type that should fit both operands, but it does help to have tests that also confirm this. Added some saturation cases under `TestSaturationComparisons`.
> 
> As for padding, `TestSaturationComparisons` have cases comparing signed with unsigned types, and there are other cases in `TestComparisons` and `TestIntComparisons` that deal with unsigned comparisons. The way the lit tests are organized, lines marked with `CHECK` mean that those lines are produced for both the padding and no padding cases whereas `SIGNED` or `UNSIGNED` are produced exclusively for no padding and padding cases, respectively.
There is a difference between saturating signed types and saturating unsigned types, though; the common type of two of the same saturating unsigned type is one bit less due to padding.

Unless there is something in the type commoning that I've missed?


Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D57219/new/

https://reviews.llvm.org/D57219