add memset32/memset64

2 files changed, 34 insertions, 0 deletions

diff --git a/src/libstd/ptr.rs b/src/libstd/ptr.rs
index 97a7d0e11a6..e787558c6e4 100644
--- a/src/libstd/ptr.rs
+++ b/src/libstd/ptr.rs
@@ -19,6 +19,7 @@ use sys;
 #[cfg(not(test))] use cmp::{Eq, Ord};
 use uint;
 
+#[cfg(stage0)]
 pub mod libc_ {
     use libc::c_void;
     use libc;
@@ -157,11 +158,26 @@ pub unsafe fn copy_nonoverlapping_memory<T>(dst: *mut T, src: *const T, count: u
 }
 
 #[inline(always)]
+#[cfg(stage0)]
 pub unsafe fn set_memory<T>(dst: *mut T, c: int, count: uint) {
     let n = count * sys::size_of::<T>();
     libc_::memset(dst as *mut c_void, c as libc::c_int, n as size_t);
 }
 
+#[inline(always)]
+#[cfg(target_word_size = "32", not(stage0))]
+pub unsafe fn set_memory<T>(dst: *mut T, c: u8, count: uint) {
+    use unstable::intrinsics::memset32;
+    memset32(dst, c, count as u32);
+}
+
+#[inline(always)]
+#[cfg(target_word_size = "64", not(stage0))]
+pub unsafe fn set_memory<T>(dst: *mut T, c: u8, count: uint) {
+    use unstable::intrinsics::memset64;
+    memset64(dst, c, count as u64);
+}
+
 /**
   Transform a region pointer - &T - to an unsafe pointer - *T.
   This is safe, but is implemented with an unsafe block due to
@@ -603,4 +619,12 @@ pub mod ptr_tests {
             });
         }
     }
+
+    #[test]
+    fn test_set_memory() {
+        let mut xs = [0u8, ..20];
+        let ptr = vec::raw::to_mut_ptr(xs);
+        unsafe { set_memory(ptr, 5u8, xs.len()); }
+        assert_eq!(xs, [5u8, ..20]);
+    }
 }
diff --git a/src/libstd/unstable/intrinsics.rs b/src/libstd/unstable/intrinsics.rs
index 1aeec0e0b1c..908c5e23ab0 100644
--- a/src/libstd/unstable/intrinsics.rs
+++ b/src/libstd/unstable/intrinsics.rs
@@ -31,6 +31,7 @@ A quick refresher on memory ordering:
   with atomic types and is equivalent to Java's `volatile`.
 
 */
+
 #[abi = "rust-intrinsic"]
 pub extern "rust-intrinsic" {
 
@@ -152,6 +153,15 @@ pub extern "rust-intrinsic" {
     #[cfg(not(stage0))]
     pub fn memmove64<T>(dst: *mut T, src: *T, count: u64);
 
+    /// Equivalent to the `llvm.memset.p0i8.i32` intrinsic, with a size of
+    /// `count` * `size_of::<T>()` and an alignment of `min_align_of::<T>()`
+    #[cfg(not(stage0))]
+    pub fn memset32<T>(dst: *mut T, val: u8, count: u32);
+    /// Equivalent to the `llvm.memset.p0i8.i64` intrinsic, with a size of
+    /// `count` * `size_of::<T>()` and an alignment of `min_align_of::<T>()`
+    #[cfg(not(stage0))]
+    pub fn memset64<T>(dst: *mut T, val: u8, count: u64);
+
     pub fn sqrtf32(x: f32) -> f32;
     pub fn sqrtf64(x: f64) -> f64;