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I agree on the dropping compliance when asked for aspect, the problem I'm referring to more is the driver dropping compliance without the game asking for it. If the underlying system can randomly drop compliance when ever it thinks it's fine without telling the user and without the user asking, I would not consider that compliant.

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That is fair, if true. But I’m very skeptical any modern drivers are dropping compliance without being asked. The one possibility I could buy is that you ran into a case of someone having dropped precision intentionally in a specific game in order to “optimize” a shader. Otherwise, precision and IEEE compliance is the prerogative of the compiler. The compiler is sometimes in the driver, but it never decides on it’s own what precision to use, it uses either default or explicit precision settings. The only reason it would not produce IEEE compliant code is if it was being asked to.

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