add memcpy intrinsic to mirror memmove

Author: thestinger

src/librustc/middle/trans/foreign.rs

@@ -845,6 +845,26 @@ pub fn trans_intrinsic(ccx: @CrateContext,
                                              T_ptr(T_nil()));
             Store(bcx, morestack_addr, fcx.llretptr.get());
         }
+        ~"memcpy32" => {
+            let dst_ptr = get_param(decl, first_real_arg);
+            let src_ptr = get_param(decl, first_real_arg + 1);
+            let size = get_param(decl, first_real_arg + 2);
+            let align = C_i32(1);
+            let volatile = C_i1(false);
+            let llfn = *bcx.ccx().intrinsics.get(
+                &~"llvm.memcpy.p0i8.p0i8.i32");
+            Call(bcx, llfn, [dst_ptr, src_ptr, size, align, volatile]);
+        }
+        ~"memcpy64" => {
+            let dst_ptr = get_param(decl, first_real_arg);
+            let src_ptr = get_param(decl, first_real_arg + 1);
+            let size = get_param(decl, first_real_arg + 2);
+            let align = C_i32(1);
+            let volatile = C_i1(false);
+            let llfn = *bcx.ccx().intrinsics.get(
+                &~"llvm.memcpy.p0i8.p0i8.i64");
+            Call(bcx, llfn, [dst_ptr, src_ptr, size, align, volatile]);
+        }
         ~"memmove32" => {
             let dst_ptr = get_param(decl, first_real_arg);
             let src_ptr = get_param(decl, first_real_arg + 1);

src/librustc/middle/trans/type_use.rs

@@ -135,7 +135,7 @@ pub fn type_uses_for(ccx: @CrateContext, fn_id: def_id, n_tps: uint)
                 ~"visit_tydesc"  | ~"forget" | ~"frame_address" |
                 ~"morestack_addr" => 0,
 
-                ~"memmove32" | ~"memmove64" => 0,
+                ~"memcpy32" | ~"memcpy64" | ~"memmove32" | ~"memmove64" => 0,
 
                 ~"sqrtf32" | ~"sqrtf64" | ~"powif32" | ~"powif64" |
                 ~"sinf32"  | ~"sinf64"  | ~"cosf32"  | ~"cosf64"  |

src/librustc/middle/typeck/check/mod.rs

@@ -3537,6 +3537,36 @@ pub fn check_intrinsic_type(ccx: @mut CrateCtxt, it: @ast::foreign_item) {
       ~"morestack_addr" => {
         (0u, ~[], ty::mk_nil_ptr(ccx.tcx))
       }
+      ~"memcpy32" => {
+        (0,
+         ~[
+            ty::mk_ptr(tcx, ty::mt {
+                ty: ty::mk_u8(),
+                mutbl: ast::m_mutbl
+            }),
+            ty::mk_ptr(tcx, ty::mt {
+                ty: ty::mk_u8(),
+                mutbl: ast::m_imm
+            }),
+            ty::mk_u32()
+         ],
+         ty::mk_nil())
+      }
+      ~"memcpy64" => {
+        (0,
+         ~[
+            ty::mk_ptr(tcx, ty::mt {
+                ty: ty::mk_u8(),
+                mutbl: ast::m_mutbl
+            }),
+            ty::mk_ptr(tcx, ty::mt {
+                ty: ty::mk_u8(),
+                mutbl: ast::m_imm
+            }),
+            ty::mk_u64()
+         ],
+         ty::mk_nil())
+      }
       ~"memmove32" => {
         (0,
          ~[

src/libstd/unstable/intrinsics.rs

@@ -128,6 +128,13 @@ pub extern "rust-intrinsic" {
     /// Get the address of the `__morestack` stack growth function.
     pub fn morestack_addr() -> *();
 
+    /// Equivalent to the `llvm.memcpy.p0i8.0i8.i32` intrinsic.
+    #[cfg(not(stage0))]
+    pub fn memcpy32(dst: *mut u8, src: *u8, size: u32);
+    /// Equivalent to the `llvm.memcpy.p0i8.0i8.i64` intrinsic.
+    #[cfg(not(stage0))]
+    pub fn memcpy64(dst: *mut u8, src: *u8, size: u64);
+
     /// Equivalent to the `llvm.memmove.p0i8.0i8.i32` intrinsic.
     pub fn memmove32(dst: *mut u8, src: *u8, size: u32);
     /// Equivalent to the `llvm.memmove.p0i8.0i8.i64` intrinsic.