[llvm-bugs] [Bug 30841] wrong code at -O1 and above on x86_64-linux-gnu in 32-bit mode

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30841

Sanjay Patel <spatel+llvm at rotateright.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #6 from Sanjay Patel <spatel+llvm at rotateright.com> ---
Dangers of trying to make better DAG folds noted...

Hopefully fixed with:
https://reviews.llvm.org/rL285656

Thanks, Zhendong!

Note: I skimmed the rest of InstCombiner::SimplifyDemandedUseBits(), and this
appears to be the only case where we need to clear nsw/nuw. 

It would obviously be better if there was some way to share the demanded bits
logic between IR and the DAG.

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