[SystemZ] Support Swift calling convention

Summary:
Port rL265324 to SystemZ to allow using the 'swiftcall' attribute on that architecture.

Depends on D19414.

Reviewers: kbarton, rjmccall, uweigand

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D19432

llvm-svn: 267879

1 files changed, 8 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index 4512f702e7e..08d6741f556 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -5713,12 +5713,12 @@ void NVPTXTargetCodeGenInfo::addNVVMMetadata(llvm::Function *F, StringRef Name,
 
 namespace {
 
-class SystemZABIInfo : public ABIInfo {
+class SystemZABIInfo : public SwiftABIInfo {
   bool HasVector;
 
 public:
   SystemZABIInfo(CodeGenTypes &CGT, bool HV)
-    : ABIInfo(CGT), HasVector(HV) {}
+    : SwiftABIInfo(CGT), HasVector(HV) {}
 
   bool isPromotableIntegerType(QualType Ty) const;
   bool isCompoundType(QualType Ty) const;
@@ -5738,6 +5738,12 @@ public:
 
   Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
                     QualType Ty) const override;
+
+  bool shouldPassIndirectlyForSwift(CharUnits totalSize,
+                                    ArrayRef<llvm::Type*> scalars,
+                                    bool asReturnValue) const override {
+    return occupiesMoreThan(CGT, scalars, /*total*/ 4);
+  }
 };
 
 class SystemZTargetCodeGenInfo : public TargetCodeGenInfo {