It's easier for most building blocks (like transcendental functions) to be discussed in terms of worst case ULP error (e.g., <= 1 everywhere, <= 3, etc.). For example, SPIR-V / OpenCL has this section on the requirements to meet the OpenCL 3.0 spec (https://registry.khronos.org/OpenCL/specs/3.0-unified/html/O...). NVIDIA includes per-PTX-revision ULP information in their docs (e.g., https://docs.nvidia.com/cuda/parallel-thread-execution/#floa... for Divide and https://docs.nvidia.com/cuda/parallel-thread-execution/#floa... more broadly).