arsenm wrote:

> The only test failure is `CodeGen/AMDGPU/call-args-inreg.ll`. It crashes when 
> lowering function `test_call_external_void_func_a15i32_inreg`.
> 
> https://github.com/llvm/llvm-project/blob/8d13e7b8c382499c1cf0c2a3184b483e760f266b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp#L905

Something is wrong with how inreg is interacting with special arguments at 
callsites. The special arguments shouldn't be changing the number of registers 
available for user arguments. 

https://github.com/llvm/llvm-project/pull/112403
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