t-tye added inline comments.
================
Comment at: lib/CodeGen/CGDecl.cpp:1105-1119
+  // Alloca always returns a pointer in alloca address space, which may
+  // be different from the type defined by the language. For example,
+  // in C++ the auto variables are in the default address space. Therefore
+  // cast alloca to the expected address space when necessary.
+  auto Addr = address.getPointer();
+  auto AddrTy = cast<llvm::PointerType>(Addr->getType());
+  auto ExpectedAddrSpace = 
CGM.getTypes().getVariableType(D)->getAddressSpace();
----------------
Is any assert done to ensure that it is legal to address space cast from 
variable address space to expected address space? Presumably the language, by 
definition, will only be causing legal casts. For example from alloca address 
space to generic (which includes the alloca address space).

For OpenCL, can you explain how the local variable can have the constant 
address space and use an alloca for allocation? Wouldn't a constant address 
space mean it was static and so should not be using alloca? And if it is using 
an alloca, how can it then be accessed as if it was in constant address space?


================
Comment at: lib/CodeGen/CodeGenTypes.h:200
+  /// Get the LLVM pointer type of a variable.
+  llvm::PointerType *getVariableType(VarDecl D);
+
----------------
Should the name reflect that the type returned is not the variable type, but a 
pointer to the variable type? For example, getVariablePointerType or 
getPointerToVariableType.


https://reviews.llvm.org/D32248



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