edanor/umesimd

[Tests] Fix precision constraints for FP math operations

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edanor commented

Originally reported by: edanor (Bitbucket: edanor, GitHub: edanor)

Some floating point operations rely on approximation. The problem is to test such functions against standard version with automatically generated data inputs.

What should be done is:

  1. design a code pattern for calculating 'ULP distance' from the reference value,
  2. create a test fail/pass threshold value expressed in this ULP distance,
  3. report the ulp precision (for selected tests only) together with test result.