Fix black_box bug detected by Amanieu

Co-authored-by: Amanieu <amanieu@gmail.com>
2020-09-16 09:25:54 +00:00 · 2020-09-16 09:25:54 +00:00 · 4dc4e9f671
commit 4dc4e9f671
parent 87666e5bce
1 changed files with 1 additions and 1 deletions
--- a/library/core/src/hint.rs
+++ b/library/core/src/hint.rs
@ -122,7 +122,7 @@ pub fn black_box<T>(mut dummy: T) -> T {
    // SAFETY: the inline assembly is a no-op.
    unsafe {
        // FIXME: Cannot use `asm!` because it doesn't support MIPS and other architectures.
-        llvm_asm!("" : : "r"(&mut dummy));
+        llvm_asm!("" : : "r"(&mut dummy) : "memory" : "volatile");
    }

    dummy