New NVIDIA OpenCL error

[PlasmaPower]

I'm getting this when trying to compile any commit (I also tried 30eedd0) on my current system. I have opencl-nvidia 415.25-1 from the Arch Linux repositories.

Instruction does not dominate all uses!
  %getElem5841.16 = getelementptr [64 x i8] addrspace(5)* %125, i64 0, i64 16
  %1926 = bitcast i8 addrspace(5)* %getElem5841.16 to <4 x i32> addrspace(5)*
Broken module found, compilation terminated!

cc @webmaster128

[webmaster128]

No idea, sorry. Never came across that. Which NVIDIA driver works on which system is aktually a mystery to me. On GPUEater you cannot apt upgrade without breaking the driver and on a different Linux NVIDIA GPU server I also had trouble with some of the available drivers.

[PlasmaPower]

I've seen similar errors in the past with broken code, so I think this is probably a case of hidden undefined behavior.

[webmaster128]

I found this which explains nicely what "Instruction does not dominate all uses!" means. However, it is probably hard to map those instructions in the error to .cl source code.

[PlasmaPower]

I guess I'll wait a while and see if newer drivers fix the problem, because it shouldn't give me an LLVM error, but I've seen LLVM errors before from broken OpenCL.

[webmaster128]

Duplicate of #18

[PlasmaPower]

Good catch, thanks