regcall: Implement regcall Calling Conv in clang

This patch implements the register call calling convention, which ensures
as many values as possible are passed in registers. CodeGen changes
were committed in https://reviews.llvm.org/rL284108.

Differential Revision: https://reviews.llvm.org/D25204

llvm-svn: 285849

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/AST/Mangle.cpp b/clang/lib/AST/Mangle.cpp
index ee241732e8ad..05dd886adcef 100644
--- a/clang/lib/AST/Mangle.cpp
+++ b/clang/lib/AST/Mangle.cpp
@@ -52,6 +52,7 @@ void MangleContext::anchor() { }
 enum CCMangling {
   CCM_Other,
   CCM_Fast,
+  CCM_RegCall,
   CCM_Vector,
   CCM_Std
 };
@@ -152,6 +153,8 @@ void MangleContext::mangleName(const NamedDecl *D, raw_ostream &Out) {
     Out << '_';
   else if (CC == CCM_Fast)
     Out << '@';
+  else if (CC == CCM_RegCall)
+    Out << "__regcall3__";
 
   if (!MCXX)
     Out << D->getIdentifier()->getName();