Nvidia GPU: field substraction and multiplication #348
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This PR adds:
This ups the minimum requirement to Cuda 11.5.1 to ensure 32-bit fused-multiply-add "hi" works properly: https://forums.developer.nvidia.com/t/wrong-result-returned-by-madc-hi-u64-ptx-instruction-for-specific-operands/196094
Also, using 64-bit arithmetic on GPU will give wrong results due to: https://forums.developer.nvidia.com/t/incorrect-result-of-ptx-code/221067