[llvm-dev] What is the right lowering for misaligned memory access?

[Jon Chesterfield via llvm-dev]

What should a well behaved back end do with a load or store with alignment
less than the natural alignment of the type?

I believe C++ considers such access to be UB. I'm not sure what the IR
semantics are.

I think my options are:
- Delete the operation / use undef
- Lower as if it is naturally aligned
- Lower via inefficient code that assumes align 1

Thanks,

Jon
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