mirror of https://github.com/rust-lang/rust
45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
//@ run-pass
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#![feature(core_intrinsics)]
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use std::intrinsics::*;
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pub fn main() {
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unsafe {
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let mut x: Box<u8> = Box::new(0);
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let mut y: Box<u8> = Box::new(0);
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// test volatile load
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assert_eq!(volatile_load(&*x), 0);
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*x = 1;
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assert_eq!(volatile_load(&*x), 1);
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// test volatile store
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volatile_store(&mut *x, 2);
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assert_eq!(*x, 2);
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// test volatile copy memory
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volatile_copy_memory(&mut *y, &*x, 1);
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assert_eq!(*y, 2);
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// test volatile copy non-overlapping memory
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*x = 3;
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volatile_copy_nonoverlapping_memory(&mut *y, &*x, 1);
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assert_eq!(*y, 3);
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// test volatile set memory
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volatile_set_memory(&mut *x, 4, 1);
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assert_eq!(*x, 4);
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// test unaligned volatile load
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let arr: [u8; 3] = [1, 2, 3];
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let ptr = arr[1..].as_ptr() as *const u16;
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assert_eq!(unaligned_volatile_load(ptr), u16::from_ne_bytes([arr[1], arr[2]]));
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// test unaligned volatile store
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let ptr = arr[1..].as_ptr() as *mut u16;
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unaligned_volatile_store(ptr, 0);
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assert_eq!(arr, [1, 0, 0]);
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}
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}
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