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use std::alloc;
use std::mem;
pub unsafe fn alloc_bytes(size: usize, alignment: usize) -> *mut u8 {
alloc::alloc(alloc::Layout::from_size_align(size, alignment).unwrap())
}
pub unsafe fn vec_bytes(capacity: usize, alignment: usize) -> Vec<u8> {
let aligned_buffer = alloc_bytes(capacity, alignment);
Vec::from_raw_parts(aligned_buffer as _, 0, capacity)
}
pub unsafe fn uninitialized_bytes(size: usize, alignment: usize) -> Vec<u8> {
let aligned_buffer = alloc_bytes(size, alignment);
Vec::from_raw_parts(aligned_buffer as _, size, size)
}
pub unsafe fn uninitialized<T>(size: usize, alignment_bytes: usize) -> Vec<T> {
let aligned_buffer = alloc_bytes(size * mem::size_of::<T>(), alignment_bytes);
Vec::from_raw_parts(aligned_buffer as _, size, size)
}
pub fn realign_slice<T: Copy>(v: &[T], alignment: usize) -> Vec<T> {
if v.len() == 0 {
return vec![];
}
unsafe {
let t = mem::size_of::<T>();
let aligned = alloc_bytes(v.len() * t, alignment);
let mut result = Vec::from_raw_parts(aligned as _, v.len(), v.len());
result.copy_from_slice(&v);
result
}
}
pub fn realign_vec<T: Copy>(v: Vec<T>, alignment: usize) -> Vec<T> {
if v.len() == 0 || v.as_ptr() as usize % alignment == 0 {
return v;
}
realign_slice(&v, alignment)
}