Add attributes for preserve_mostcc/preserve_allcc calling conventions to the C/C++ front-end

Till now, preserve_mostcc/preserve_allcc calling convention attributes were only
available at the LLVM IR level. This patch adds attributes for
preserve_mostcc/preserve_allcc calling conventions to the C/C++ front-end.

The code was mostly written by Juergen Ributzka.
I just added support for the AArch64 target and tests.

Differential Revision: http://reviews.llvm.org/D18025

llvm-svn: 263647

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 797d052d0c1..a151c594783 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -4095,6 +4095,8 @@ public:
     case CC_X86VectorCall:
     case CC_IntelOclBicc:
     case CC_X86_64Win64:
+    case CC_PreserveMost:
+    case CC_PreserveAll:
       return CCCR_OK;
     default:
       return CCCR_Warning;
@@ -5545,6 +5547,8 @@ public:
     switch (CC) {
     case CC_C:
     case CC_Swift:
+    case CC_PreserveMost:
+    case CC_PreserveAll:
       return CCCR_OK;
     default:
       return CCCR_Warning;