[OpenCL] Defines helper function for kernel language compatible OpenCL version

This change defines a helper function getOpenCLCompatibleVersion()
inside LangOptions class. The function contains mapping between
C++ for OpenCL versions and their corresponding compatible OpenCL
versions. This mapping function should be updated each time a new
C++ for OpenCL language version is introduced. The helper function
is expected to simplify conditions on OpenCL C and C++ for OpenCL
versions inside compiler code.

Code refactoring performed.

Differential Revision: https://reviews.llvm.org/D108693

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/lib/Basic/LangOptions.cpp b/clang/lib/Basic/LangOptions.cpp
index 3e3e7fe3..b6dc73d 100644
--- a/clang/lib/Basic/LangOptions.cpp
+++ b/clang/lib/Basic/LangOptions.cpp
@@ -52,6 +52,16 @@ VersionTuple LangOptions::getOpenCLVersionTuple() const {
   return VersionTuple(Ver / 100, (Ver % 100) / 10);
 }
 
+unsigned LangOptions::getOpenCLCompatibleVersion() const {
+  if (!OpenCLCPlusPlus)
+    return OpenCLVersion;
+  if (OpenCLCPlusPlusVersion == 100)
+    return 200;
+  if (OpenCLCPlusPlusVersion == 202100)
+    return 300;
+  llvm_unreachable("Unknown OpenCL version");
+}
+
 void LangOptions::remapPathPrefix(SmallString<256> &Path) const {
   for (const auto &Entry : MacroPrefixMap)
     if (llvm::sys::path::replace_path_prefix(Path, Entry.first, Entry.second))