Support memcpy/memmove with differing src/dst alignment

If LLVM 7 is used, generate memcpy/memmove with differing
src/dst alignment. I've added new FFI functions to construct
these through the builder API, which is more convenient than
dealing with differing intrinsic signatures depending on the
LLVM version.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/librustc_codegen_llvm/llvm/ffi.rs b/src/librustc_codegen_llvm/llvm/ffi.rs
index f046ea03027..64066d4d786 100644
--- a/src/librustc_codegen_llvm/llvm/ffi.rs
+++ b/src/librustc_codegen_llvm/llvm/ffi.rs
@@ -998,6 +998,22 @@ extern "C" {
                              Bundle: Option<&OperandBundleDef<'a>>,
                              Name: *const c_char)
                              -> &'a Value;
+    pub fn LLVMRustBuildMemCpy(B: &Builder<'a>,
+                               Dst: &'a Value,
+                               DstAlign: c_uint,
+                               Src: &'a Value,
+                               SrcAlign: c_uint,
+                               Size: &'a Value,
+                               IsVolatile: bool)
+                               -> &'a Value;
+    pub fn LLVMRustBuildMemMove(B: &Builder<'a>,
+                                Dst: &'a Value,
+                                DstAlign: c_uint,
+                                Src: &'a Value,
+                                SrcAlign: c_uint,
+                                Size: &'a Value,
+                                IsVolatile: bool)
+                                -> &'a Value;
     pub fn LLVMBuildSelect(B: &Builder<'a>,
                            If: &'a Value,
                            Then: &'a Value,