[PATCH] D25913: [InstCombine] Fold nuw left-shifts in `ugt`/`ule` comparisons.

[Sanjay Patel via llvm-commits]

spatel added reviewers: majnemer, efriedma.
spatel added a comment.

Yes, adding the derivation to the comments would be good.

I wasn't really concerned about the speed of the extra check for *C != 0; it just simplified the code to not have the extra check for that half of the transform. Since I've gotten that sort of assumption wrong before, I'm cc'ing David and Eli to see if they have a better idea.


Repository:
  rL LLVM

https://reviews.llvm.org/D25913