[PATCH] D158648: InstCombine: Introduce SimplifyDemandedUseFPClass

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


================
Comment at: llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp:1846
+    case Intrinsic::fabs:
+      if (SimplifyDemandedFPClass(I, 0, llvm::fabs(DemandedMask), Known,
+                                  Depth + 1))
----------------
arsenm wrote:
> RKSimon wrote:
> > nikic wrote:
> > > It seems like this is correct, but only because `fabs(FPClassTest)` apparently does the exact opposite of what one would expect it to do. It's really `inverse_fabs()`.
> > Do we need a llvm::inverse_fabs() ? Or at least a comment describing the behaviour
> This probably just needs to be renamed, this is what it is. Not sure that's the right name, make_sign_insensitive or something maybe? unknown_sign?
unknown_sign makes sense to me


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  https://reviews.llvm.org/D158648/new/

https://reviews.llvm.org/D158648