[llvm] [InstCombine] Replace all dominated uses of condition with constants (PR #105510)

[Nikita Popov via llvm-commits]

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nikic wrote:

So the problem here is that GVN CSE's two icmps, but we only have the needed dominance relationship after JumpThreading. And after that we don't have passes capable of doing this anymore. So I think the InstCombine approach is fine.

https://github.com/llvm/llvm-project/pull/105510