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Pointers Are Complicated II, or: We need better language specs
just because two pointers point to the same address, does not mean they are equal in the sense that they can be used interchangeably.
This “extra information” that distinguishes different pointers to the same address is typically called
provenance.
This post is another attempt to convince you that provenance is “real”, by telling a cautionary tale of what can go wrong when provenance is not considered sufficiently carefully in an optimizing compiler.
The post is self-contained; I am not assuming that you have read the first one.
There is also a larger message here about how we could prevent such issues from coming up in the future by spending more effort on the specification of compiler IRs. ....

Chung Kil Hur , John Regehr , Nunop Lopes , Pointers Are Complicated , Undefined Behavior , May Never , Abstract Machine , சுங் கீழ் அவசரம் , ஜான் ரேகேஹ்ர் , பாயஂடர்ஸ் உள்ளன சிக்கலானது , வரையறுக்கப்படவில்லை நடத்தை , இருக்கலாம் ஒருபோதும் ,