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...eas this intrinsic would be used in a much more targeted manner (ie at the SSA value level) by the developer and leave the rest of the module unmolested. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20151106/f0d8f5e9/attachment.html>

Hey all, I'd like to propose a new intrinsic for use in preventing optimizations from deleting IR due to constant propagation, dead code elimination, etc. # Background/Motivation In Rust we have a crate called `test` which provides a function, `black_box`, which is designed to be a no-op function that prevents constprop, die, etc from interfering with tests/benchmarks but otherwise