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#![cfg(all(
target_arch = "arm",
not(any(target_env = "gnu", target_env = "musl")),
target_os = "linux",
feature = "mem"
))]
#![feature(compiler_builtins_lib)]
#![no_std]
extern crate compiler_builtins;
// test runner
extern crate utest_cortex_m_qemu;
// overrides `panic!`
#[macro_use]
extern crate utest_macros;
use core::mem;
macro_rules! panic {
($($tt:tt)*) => {
upanic!($($tt)*);
};
}
// SAFETY: defined in compiler-builtins
unsafe extern "aapcs" {
fn __aeabi_memclr4(dest: *mut u8, n: usize);
fn __aeabi_memset4(dest: *mut u8, n: usize, c: u32);
}
struct Aligned {
array: [u8; 8],
_alignment: [u32; 0],
}
impl Aligned {
fn new() -> Self {
Aligned {
array: [0; 8],
_alignment: [],
}
}
}
#[test]
fn memclr4() {
let mut aligned = Aligned::new();
assert_eq!(mem::align_of_val(&aligned), 4);
let xs = &mut aligned.array;
for n in 0..9 {
unsafe {
__aeabi_memset4(xs.as_mut_ptr(), n, 0xff);
__aeabi_memclr4(xs.as_mut_ptr(), n);
}
assert!(xs[0..n].iter().all(|x| *x == 0));
}
}
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