Fix invalid calling convention used for libcalls on ARM.

ARM ABI specifies that all the libcalls use soft FP ABI 
(even hard FP binaries). These days clang emits _mulsc3 / _muldc3
calls with default (C) calling convention which would be translated
into AAPCS_VFP LLVM calling and thus the result of complex
multiplication will be bogus.

Introduce a way for a target to specify explicitly calling
convention for libcalls. Right now this is temporary correctness
fix. Ultimately, we'll end with intrinsic for complex 
multiplication and all calling convention decisions for libcalls
will be put into backend.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@223123 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/CodeGen/ABIInfo.h b/lib/CodeGen/ABIInfo.h
index 2976b605d3..7e7f7fa206 100644
--- a/lib/CodeGen/ABIInfo.h
+++ b/lib/CodeGen/ABIInfo.h
@@ -44,9 +44,12 @@ namespace clang {
     CodeGen::CodeGenTypes &CGT;
   protected:
     llvm::CallingConv::ID RuntimeCC;
+    llvm::CallingConv::ID BuiltinCC;
   public:
     ABIInfo(CodeGen::CodeGenTypes &cgt)
-      : CGT(cgt), RuntimeCC(llvm::CallingConv::C) {}
+      : CGT(cgt),
+        RuntimeCC(llvm::CallingConv::C),
+        BuiltinCC(llvm::CallingConv::C) {}
 
     virtual ~ABIInfo();
 
@@ -62,6 +65,11 @@ namespace clang {
       return RuntimeCC;
     }
 
+    /// Return the calling convention to use for compiler builtins
+    llvm::CallingConv::ID getBuiltinCC() const {
+      return BuiltinCC;
+    }
+
     virtual void computeInfo(CodeGen::CGFunctionInfo &FI) const = 0;
 
     /// EmitVAArg - Emit the target dependent code to load a value of