CUDA compilers have options for producing 32-bit or 64-bit PTX. What is the difference between these? Is it like for x86, NVidia GPUs actually have 32-bit and 64-bit ISAs? Or is it related to host code only?
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Pointers are certainly the most obvious difference. 64 bit machine model enables 64-bit pointers. 64 bit pointers enable a variety of things, such as address spaces larger than 4GB, and unified virtual addressing. Unified virtual addressing in turn enables other things, such as GPUDirect Peer-to-Peer. The CUDA IPC API also depends on 64 bit machine model.
The x64 ISA is not completely different than the x86 ISA, it's mostly an extension of it. Those familiar with the x86 ISA will find the x64 ISA familiar, with natural extensions for 64-bits where needed. Likewise 64 bit machine model is an extension of the capabilities of the PTX ISA to 64-bits. Most PTX instructions work exactly the same way.
32 bit machine model can handle 64 bit data types (such as
doubleandlong long), so frequently there don't need to be any changes to properly written CUDA C/C++ source code to compile for 32 bit machine model or 64 bit machine model. If you program directly in PTX, you may have to account for the pointer size differences, at least.