rjmccall added inline comments.

================
Comment at: lib/CodeGen/CGCUDANV.cpp:98
+std::string CGNVCUDARuntime::addPrefixToName(CodeGenModule &CGM,
+                                             std::string FuncName) const {
+  if (CGM.getLangOpts().HIP)
----------------
Can you take these as StringRefs or Twines?




================
Comment at: lib/CodeGen/CGCUDANV.cpp:104
+std::string CGNVCUDARuntime::addPrefixToNameBar(CodeGenModule &CGM,
+                                                std::string FuncName) const {
+  if (CGM.getLangOpts().HIP)
----------------
I think "addUnderscoredPrefixToName" would be better.


================
Comment at: lib/CodeGen/CGCUDANV.cpp:134
 llvm::Constant *CGNVCUDARuntime::getLaunchFn() const {
   // cudaError_t cudaLaunch(char *)
+  if (CGM.getLangOpts().HIP)
----------------
Please move this comment down into the else clause (and terminate it with a 
semicolon) and add your own declaration comment in your clause.


================
Comment at: lib/Frontend/CompilerInvocation.cpp:2109
+      Opts.HIP = true;
+  }
+
----------------
Why is this done here?  We infer the language mode from the input kind 
somewhere else.


https://reviews.llvm.org/D44984



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