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Github Enable mutable noalias for LLVM >= 12 by nikic · Pull Request #82834 ·...

 3 years ago
source link: https://github.com/rust-lang/rust/pull/82834
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nikic commented 25 days ago •

edited

Enable mutable noalias by default on LLVM 12, as previously known miscompiles have been resolved. Now it's time to find the next one ;)

  • The -Z mutable-noalias option no longer has an explicit default and accepts -Z mutable-noalias=yes and -Z mutable-noalias=no to override the LLVM version based default behavior.
  • The decision on whether to apply the noalias attribute is moved into rustc_codegen_llvm. rustc_middle only provides us with the necessary information to make the decision.
  • noalias is not emitted for types that are !Unpin, as a heuristic for self-referential structures (see #54878 and #63818).

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