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misc cleanup + change refcount pointer to avoid branching

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Brendan Hansknecht 2023-03-12 10:29:53 -07:00
parent 216fd3f9f6
commit dfb748fb03
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11 changed files with 108 additions and 210 deletions
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11
crates/roc_std/src/roc_list.rs
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@ -28,6 +28,8 @@ use serde::{
pub struct RocList<T> {
elements: Option<NonNull<ManuallyDrop<T>>>,
length: usize,
// This technically points to directly after the refcount.
// This is an optimization that enables use one code path for regular lists and slices for geting the refcount ptr.
capacity_or_ref_ptr: usize,
}
@ -181,14 +183,11 @@ impl<T> RocList<T> {
/// Useful for doing memcpy on the underlying allocation. Returns NULL if list is empty.
pub(crate) unsafe fn ptr_to_allocation(&self) -> *mut c_void {
let alignment = Self::alloc_alignment() as usize;
if self.is_seamless_slice() {
(self.capacity_or_ref_ptr << 1) as *mut _
((self.capacity_or_ref_ptr << 1) - alignment) as *mut _
} else {
unsafe {
self.ptr_to_first_elem()
.cast::<u8>()
.sub(Self::alloc_alignment() as usize) as *mut _
}
unsafe { self.ptr_to_first_elem().cast::<u8>().sub(alignment) as *mut _ }
}
}