[PATCH] D61725: Non-8-bit addressable units showcase

[Thomas Pietsch via Phabricator via llvm-commits]

Tommy added a comment.

Dear Jesper,

I am working on an architecture where the minimal addressable unit size is 64 bit. So far everything worked fine until I started testing strings(i8-layout) and  pointer to char and short, were I ran into serious problems with the 8-bit/Byte alignment philosophy of LLVM. After research with Dr. Google I found a solution from Embecosm and your approach and decided to follow this solution.

My question is:

How do you deal with the  Int8PtrTy, AllocaInt8PtrTy and getInt8PtrTy, which are all over llvm and clang.
e.g.

  Int8PtrTy = Int8Ty->getPointerTo(0);
  Int8PtrPtrTy = Int8PtrTy->getPointerTo(0);
  AllocaInt8PtrTy = Int8Ty->getPointerTo(
      M.getDataLayout().getAllocaAddrSpace());

or

  Int8Ptr(Type::getInt8PtrTy(Context)),
  ResumeFnType(FunctionType::get(Type::getVoidTy(Context), Int8Ptr,
                                 /*isVarArg=*/false)),
  NullPtr(ConstantPointerNull::get(Int8Ptr)) {}

or

  /// void* in address space 0
  union {
    llvm::PointerType *VoidPtrTy;
    llvm::PointerType *Int8PtrTy;
  };

I would appreciate your help (thomas at pietsch.info)

Thomas


Repository:
  rL LLVM

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  https://reviews.llvm.org/D61725/new/

https://reviews.llvm.org/D61725