Probable Context-Aware Warnings for Floating-Point Equality Comparisons

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Rechercherichtung

Read the issue’s linked Secure Coding Guide section for CWE-664/CWE-197 and review the floating-point equality examples it cites from NeMo and PyTorch. The issue asks whether warnings should be context-dependent, but gives no proposed change or acceptance criteria; done would require agreeing on guidance and updating the relevant guide section to reflect it.

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Beschreibung

I am working at OpenRefactory, a static analysis tool company. Our CEO, @openrefactorymunawar previously had some interactions with you and we have been improving our tool by adding the capability to detect some of the bugs that you are describing.

I have a question for one such bug pattern.

Recently, we introduced a fixer that flags warnings when floating-point values are used in equality comparisons. This practice is known to be problematic, as it can lead to unexpected outcomes due to the inherent imprecision of floating-point arithmetic.
The idea for this improvement was inspired by the guidance provided in the
Secure Coding Guide for Python (CWE-664/CWE-197)

Upon running this fixer on various projects, we found a significant number of instances where equality comparisons with floating-point values were being used. For example:

PyTorch 67 instances
NVIDIA Nemo 28 instances

Examples of such occurrences:

  1. Nemo
  2. NeMo
  3. pytorch

This raises a question: Could some of these cases be deliberate on the developers' part, where they knowingly use equality comparisons with floating-point values despite the risks, perhaps for a valid use case? If so, should we raise this warning universally, or should it be more context-dependent?

I'd love to hear your thoughts on this.

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