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do not inline black_box when building for Miri

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Ralf Jung 2020-09-07 11:31:37 +02:00
parent e114d6228b
commit caeb5544ec
1 changed files with 2 additions and 1 deletions
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library/core/src/hint.rs
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@ -108,7 +108,8 @@ pub fn spin_loop() {
/// Note however, that `black_box` is only (and can only be) provided on a "best-effort" basis. The /// Note however, that `black_box` is only (and can only be) provided on a "best-effort" basis. The
/// extent to which it can block optimisations may vary depending upon the platform and code-gen /// extent to which it can block optimisations may vary depending upon the platform and code-gen
/// backend used. Programs cannot rely on `black_box` for *correctness* in any way. /// backend used. Programs cannot rely on `black_box` for *correctness* in any way.
#[inline] #[cfg_attr(not(miri), inline)]
#[cfg_attr(miri, inline(never))]
#[unstable(feature = "test", issue = "50297")] #[unstable(feature = "test", issue = "50297")]
#[allow(unreachable_code)] // this makes #[cfg] a bit easier below. #[allow(unreachable_code)] // this makes #[cfg] a bit easier below.
pub fn black_box<T>(dummy: T) -> T { pub fn black_box<T>(dummy: T) -> T {