LLVM does not allow xchg on pointers

terralang / terra

Terra is a low-level system programming language that is embedded in and meta-programmed by the Lua programming language.

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Closed elliottslaughter closed 2 years ago

elliottslaughter commented 2 years ago

So we're going to disallow it. This seems to be a case where LLVM's documentation does not match LLVM's implementation.

This is a breaking change. That's ok because:

The feature is experimental.
Any code that used the feature will hit a compile error (i.e., there will be no silent breaking changes).
Practically speaking, the number of users who use this is probably nil.