[llvm-dev] Branch is not optimized because of right shift

[Stefanos Baziotis via llvm-dev]

Hi everyone,

In a twitch chat someone redirected me to an example that is not optimized:
https://godbolt.org/z/BL-4jL

I included the original source code and this is after -O2. We both thought
that the -8 branch could be optimized out. I added a nuw in the subtraction
and it actually does it.

Any thoughts on why that doesn't happen already?

Best,
Stefanos Baziotis
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