bjoernager/rust
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librustc: Speed up byte copy operations. r=nmatsakis

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This commit is contained in:
Patrick Walton 2013-01-28 22:44:59 -08:00
parent 97c593a1ce
commit 0c1d9befb3
7 changed files with 96 additions and 2 deletions
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26
src/libcore/ptr.rs
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@ -116,9 +116,16 @@ pub pure fn is_not_null<T>(ptr: *const T) -> bool { !is_null(ptr) }
* and destination may overlap.
*/
#[inline(always)]
#[cfg(target_word_size = "32")]
pub unsafe fn copy_memory<T>(dst: *mut T, src: *const T, count: uint) {
let n = count * sys::size_of::<T>();
libc_::memmove(dst as *mut c_void, src as *c_void, n as size_t);
memmove32(dst as *mut u8, src as *u8, n as u32);
}
#[inline(always)]
#[cfg(target_word_size = "64")]
pub unsafe fn copy_memory<T>(dst: *mut T, src: *const T, count: uint) {
let n = count * sys::size_of::<T>();
memmove64(dst as *mut u8, src as *u8, n as u64);
}
#[inline(always)]
@ -183,6 +190,23 @@ pub trait Ptr<T> {
pure fn offset(count: uint) -> self;
}
#[cfg(stage0)]
unsafe fn memmove32(dst: *mut u8, src: *const u8, count: u32) {
libc::memmove(dst as *c_void, src as *c_void, count as size_t);
}
#[cfg(stage0)]
unsafe fn memmove64(dst: *mut u8, src: *const u8, count: u64) {
libc::memmove(dst as *c_void, src as *c_void, count as size_t);
}
#[abi="rust-intrinsic"]
#[cfg(stage1)]
#[cfg(stage2)]
pub extern {
fn memmove32(dst: *mut u8, src: *u8, size: u32);
fn memmove64(dst: *mut u8, src: *u8, size: u64);
}
/// Extension methods for immutable pointers
impl<T> *T: Ptr<T> {
/// Returns true if the pointer is equal to the null pointer.