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This is similar to the existing alloca and program address spaces (D37052) and should be used when creating/accessing global variables. We need this in our CHERI fork of LLVM to place all globals in address space 200. This ensures that values are accessed using CHERI load/store instructions instead of the normal MIPS/RISC-V ones. The problem this is trying to fix is that most of the time the type of globals is created using a simple PointerType::getUnqual() (or ::get() with the default address-space value of 0). This does not work for us and we get assertion/compilation/instruction selection failures whenever a new call is added that uses the default value of zero. In our fork we have removed the default parameter value of zero for most address space arguments and use DL.getProgramAddressSpace() or DL.getGlobalsAddressSpace() whenever possible. If this change is accepted, I will upstream follow-up patches to use DL.getGlobalsAddressSpace() instead of relying on the default value of 0 for PointerType::get(), etc. This patch and the follow-up changes will not have any functional changes for existing backends with the default globals address space of zero. A follow-up commit will change the default globals address space for AMDGPU to 1. Reviewed By: dylanmckay Differential Revision: https://reviews.llvm.org/D70947 |
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