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add todo about upgrading to bit manipulation

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Brendan Hansknecht 2023-03-11 17:46:47 -08:00
parent 26f5d558d8
commit 5f6910f747
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crates/compiler/builtins/bitcode/src/list.zig
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@ -87,6 +87,9 @@ pub const RocList = extern struct {
}
pub fn decref(self: RocList, alignment: u32) void {
// TODO: I am pretty sure there is a way to do this without a branch.
// Bit manipulation should be able to conditionally select the correct pointer.
// If this is updated, we should also update decref in build_list.rs and modify_refcount_list from refcounting.rs
if (self.isSeamlessSlice()) {
const ref_ptr = @intToPtr([*]isize, self.capacity_or_ref_ptr << 1);
utils.decref_ptr_to_refcount(ref_ptr, alignment);