CodeGen: add support for MSBuiltin aliases

This completes the infrastructure for the new MSBuiltin aliases in the
instruction definitions.  These behave similar to the GCCBuiltin in that they
can be implicitly constructed without special handling unless needed.

With this change it is possible to annotate an LLVM intrinsic in the backend
instruction definitions and indicate it as a builtin in the Builtin*.def files
in clang via LANGBUILTIN.  That will automatically pass through the instruction
much as a GCCBuiltin.

Note that there is no need for the special handling for ensuring that the
compatibility flag is enabled since the filtering on the LANGBUILTIN will
automatically prevent the intrinsic from bleeding into non-MS compatible
compiler invocations.

llvm-svn: 212359

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index e70ade3..3870712 100644 (file)
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -1600,8 +1600,14 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
   const char *Name = getContext().BuiltinInfo.GetName(BuiltinID);
   Intrinsic::ID IntrinsicID = Intrinsic::not_intrinsic;
   if (const char *Prefix =
-      llvm::Triple::getArchTypePrefix(getTarget().getTriple().getArch()))
+          llvm::Triple::getArchTypePrefix(getTarget().getTriple().getArch())) {
     IntrinsicID = Intrinsic::getIntrinsicForGCCBuiltin(Prefix, Name);
+    // NOTE we dont need to perform a compatibility flag check here since the
+    // intrinsics are declared in Builtins*.def via LANGBUILTIN which filter the
+    // MS builtins via ALL_MS_LANGUAGES and are filtered earlier.
+    if (IntrinsicID == Intrinsic::not_intrinsic)
+      IntrinsicID = Intrinsic::getIntrinsicForMSBuiltin(Prefix, Name);
+  }
 
   if (IntrinsicID != Intrinsic::not_intrinsic) {
     SmallVector<Value*, 16> Args;