CodeGenCXX: support PreserveMostCC in MS ABI

Microsoft has reserved 'U' for the PreserveMostCC which is used in the
swift runtime.  Add support for this.  This allows the swift runtime to
be built for Windows again.

llvm-svn: 329025

1 files changed, 43 insertions, 4 deletions

diff --git a/clang/test/CodeGenCXX/msabi-swiftcall-cc.cpp b/clang/test/CodeGenCXX/msabi-swiftcall-cc.cpp
index e74c6b080a4..d8205ed192a 100644
--- a/clang/test/CodeGenCXX/msabi-swiftcall-cc.cpp
+++ b/clang/test/CodeGenCXX/msabi-swiftcall-cc.cpp
@@ -1,28 +1,67 @@
 // RUN: %clang_cc1 -triple i686-unknown-windows-msvc -fdeclspec -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-unknown-windows-msvc -fdeclspec -emit-llvm %s -o - | FileCheck %s -check-prefix CHECK-64
 
 void __attribute__((__swiftcall__)) f() {}
 // CHECK-DAG: @"?f@@YSXXZ"
+// CHECK-64-DAG: @"?f@@YSXXZ"
 
 void (__attribute__((__swiftcall__)) *p)();
 // CHECK-DAG: @"?p@@3P6SXXZA"
+// CHECK-64-DAG: @"?p@@3P6SXXZEA
 
 namespace {
 void __attribute__((__swiftcall__)) __attribute__((__used__)) f() { }
-// CHECK-DAG: "?f@?A@@YSXXZ"
 }
+// CHECK-DAG: @"?f@?A@@YSXXZ"
+// CHECK-64-DAG: @"?f@?A@@YSXXZ"
 
 namespace n {
 void __attribute__((__swiftcall__)) f() {}
-// CHECK-DAG: "?f@n@@YSXXZ"
 }
+// CHECK-DAG: @"?f@n@@YSXXZ"
+// CHECK-64-DAG: @"?f@n@@YSXXZ"
 
 struct __declspec(dllexport) S {
   S(const S &) = delete;
   S & operator=(const S &) = delete;
   void __attribute__((__swiftcall__)) m() { }
-  // CHECK-DAG: "?m@S@@QASXXZ"
 };
+// CHECK-DAG: @"?m@S@@QASXXZ"
+// CHECK-64-DAG: @"?m@S@@QEASXXZ"
 
 void f(void (__attribute__((__swiftcall__))())) {}
-// CHECK-DAG: "?f@@YAXP6SXXZ@Z"
+// CHECK-DAG: @"?f@@YAXP6SXXZ@Z"
+// CHECK-64-DAG: @"?f@@YAXP6SXXZ@Z"
+
+void __attribute__((__preserve_most__)) g() {}
+// CHECK-DAG: @"?g@@YUXXZ"
+// CHECK-64-DAG: @"?g@@YUXXZ"
+
+void (__attribute__((__preserve_most__)) *q)();
+// CHECK-DAG: @"?q@@3P6UXXZA"
+// CHECK-64-DAG: @"?q@@3P6UXXZEA"
+
+namespace {
+void __attribute__((__preserve_most__)) __attribute__((__used__)) g() {}
+}
+// CHECK-DAG: @"?g@?A@@YUXXZ"
+// CHECK-64-DAG: @"?g@?A@@YUXXZ"
+
+namespace n {
+void __attribute__((__preserve_most__)) g() {}
+}
+// CHECK-DAG: @"?g@n@@YUXXZ"
+// CHECK-64-DAG: @"?g@n@@YUXXZ"
+
+struct __declspec(dllexport) T {
+  T(const T &) = delete;
+  T & operator=(const T &) = delete;
+  void __attribute__((__preserve_most__)) m() {}
+};
+// CHECK-DAG: @"?m@T@@QAUXXZ"
+// CHECK-64-DAG: @"?m@T@@QEAUXXZ"
+
+void g(void (__attribute__((__preserve_most__))())) {}
+// CHECK-DAG: @"?g@@YAXP6UXXZ@Z"
+// CHECK-64-DAG: @"?g@@YAXP6UXXZ@Z"