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do not call black_box on Miri #75282

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Aug 8, 2020
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do not call black_box on Miri #75282

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4 changes: 3 additions & 1 deletion library/core/src/hint.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -119,9 +119,11 @@ pub fn black_box<T>(dummy: T) -> T {
// box. This isn't the greatest implementation since it probably deoptimizes
// more than we want, but it's so far good enough.

#[cfg(not(miri))] // This is just a hint, so it is fine to skip in Miri.
// SAFETY: the inline assembly is a no-op.
unsafe {
llvm_asm!("" : : "r"(&dummy));
dummy
}

dummy
}