diff options
| -rw-r--r-- | src/libstd/cast.rs | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/libstd/cast.rs b/src/libstd/cast.rs index d4a87f562e1..40a62c12bb3 100644 --- a/src/libstd/cast.rs +++ b/src/libstd/cast.rs @@ -14,6 +14,7 @@ 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::uninit(); { @@ -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 u64); + 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 * |