Myth: Compilers optimizing based on undefined behavior is one of the biggest real world problems with C/C++. It’s actually nowhere near.
No, we take advantage of TBAA in safe code, but not in unsafe. (Though we could do more.)
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For an example of a real-world issue where we depend on alias optzns, see https://github.com/servo/webrender/issues/1501 … (caused by https://github.com/rust-lang/rust/issues/31681 …).
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