efriedma-quic wrote:

Oh, I see.

If you can prove that it would be illegal to use a negative index with a 
particular pointer, you might be able to optimize... but I'm not sure how 
aggressive we want to be here.  Even if the C standard technically disallows 
indexing past the beginning/end of a member array, it's not something we've 
historically checked or optimized, so it's likely to break code.

https://github.com/llvm/llvm-project/pull/103088
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