[PATCH] D97901: [SystemZ] Test for infinity in testFPKind().

[Thomas Preud'homme via Phabricator via cfe-commits]

thopre added inline comments.


================
Comment at: clang/lib/CodeGen/TargetInfo.cpp:7229
+      case Builtin::BI__builtin_isfinite:
+        Invert = true;
+        LLVM_FALLTHROUGH;
----------------
uweigand wrote:
> thopre wrote:
> > jonpa wrote:
> > > What are these variants all about...?
> > > 
> > They were introduced in https://reviews.llvm.org/D24483
> This "invert" logic doesn't look correct.   "isfinite" and "isinf" **both** need to return false on NaNs.  I think you should just drop the invert logic and use a TDC mask of 0xFC0 (zero, normal, or subnormal) to implement "isfinite".
My bad, I made the same mistake in https://reviews.llvm.org/D97125. I'll revert for now and will notify this review once I've got it fixed.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D97901/new/

https://reviews.llvm.org/D97901