dschuff added a comment. FWIW X86 seems to do something similar elsewhere in this file (https://github.com/llvm/llvm-project/blob/main/clang/lib/CodeGen/CGBuiltin.cpp#L985-L986), although it doesn't seem common otherwise. I think I'd be OK with this approach (and it does seem better than trying to mess with instcombine or a new TTI hook or something)
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