this.write_scalar(res, dest)?;
}
- "uninit" => {
- // Check fast path: we don't want to force an allocation in case the destination is a simple value,
- // but we also do not want to create a new allocation with 0s and then copy that over.
- // FIXME: We do not properly validate in case of ZSTs and when doing it in memory!
- // However, this only affects direct calls of the intrinsic; calls to the stable
- // functions wrapping them do get their validation.
- // FIXME: should we check alignment for ZSTs?
- if !dest.layout.is_zst() {
- match dest.layout.abi {
- layout::Abi::Scalar(..) => {
- let x = ScalarMaybeUndef::Undef;
- this.write_immediate(Immediate::Scalar(x), dest)?;
- }
- layout::Abi::ScalarPair(..) => {
- let x = ScalarMaybeUndef::Undef;
- this.write_immediate(Immediate::ScalarPair(x, x), dest)?;
- }
- _ => {
- // Do it in memory
- let mplace = this.force_allocation(dest)?;
- assert!(mplace.meta.is_none());
- let ptr = mplace.ptr.to_ptr()?;
- this.memory_mut()
- .get_mut(ptr.alloc_id)?
- .mark_definedness(ptr, dest.layout.size, false);
- }
- }
- }
- }
-
"write_bytes" => {
let ty = substs.type_at(0);
let ty_layout = this.layout_of(ty)?;