nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2025-05-08 16:07:43 +00:00
Code Issues Packages Projects Releases Wiki Activity

black_box should inhibit optimizations on platforms without inline assembly

Browse Source
This commit is contained in:
gnzlbg 2019-03-25 11:49:08 +01:00
parent f2443831e9
commit cfa76c438a
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/libcore/hint.rs
View File

@ -106,7 +106,10 @@ pub fn black_box<T>(dummy: T) -> T {
dummy dummy
} }
#[cfg(any(target_arch = "asmjs", target_arch = "wasm32"))] { #[cfg(any(target_arch = "asmjs", target_arch = "wasm32"))] {
#[inline(never)] fn black_box_(x: T) -> T { x } unsafe {
black_box_(dummy) let ret = crate::ptr::read_volatile(&dummy);
} crate::mem::forget(dummy);
ret
}
}
} }