diff options
Diffstat (limited to 'src/libstd/cast.rs')
| -rw-r--r-- | src/libstd/cast.rs | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/src/libstd/cast.rs b/src/libstd/cast.rs index cde22afd34a..30ad41f0ca2 100644 --- a/src/libstd/cast.rs +++ b/src/libstd/cast.rs @@ -14,8 +14,9 @@ use sys; use unstable::intrinsics; /// Casts the value at `src` to U. The two types must have the same length. +#[cfg(stage0)] pub unsafe fn transmute_copy<T, U>(src: &T) -> U { - let mut dest: U = intrinsics::init(); + let mut dest: U = intrinsics::uninit(); { let dest_ptr: *mut u8 = transmute(&mut dest); let src_ptr: *u8 = transmute(src); @@ -26,6 +27,26 @@ pub unsafe fn transmute_copy<T, U>(src: &T) -> U { dest } +#[cfg(target_word_size = "32", not(stage0))] +#[inline(always)] +pub unsafe fn transmute_copy<T, U>(src: &T) -> U { + let mut dest: U = intrinsics::uninit(); + let dest_ptr: *mut u8 = transmute(&mut dest); + let src_ptr: *u8 = transmute(src); + intrinsics::memcpy32(dest_ptr, src_ptr, sys::size_of::<U>() as u32); + dest +} + +#[cfg(target_word_size = "64", not(stage0))] +#[inline(always)] +pub unsafe fn transmute_copy<T, U>(src: &T) -> U { + let mut dest: U = intrinsics::uninit(); + let dest_ptr: *mut u8 = transmute(&mut dest); + let src_ptr: *u8 = transmute(src); + intrinsics::memcpy64(dest_ptr, src_ptr, sys::size_of::<U>() as u64); + dest +} + /** * Move a thing into the void * @@ -43,6 +64,7 @@ pub unsafe fn forget<T>(thing: T) { intrinsics::forget(thing); } * and/or reinterpret_cast when such calls would otherwise scramble a box's * reference count */ +#[inline(always)] pub unsafe fn bump_box_refcount<T>(t: @T) { forget(t); } /** |