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make transmute_copy use memcpy, and inline it

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This commit is contained in:
Daniel Micay 2013-05-25 11:43:11 -04:00
parent 58d6864ad7
commit b25c520102
1 changed files with 21 additions and 0 deletions
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21
src/libstd/cast.rs
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@ -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
*