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Change floating-point predicates to intrinsic calls if possible #1999

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@catamorphism

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@catamorphism
  • See the FIXME just before is_positive, is_negative, and the like in std::f32 and std::f64. I tried, but couldn't figure out how to use a macro defined in a C math library header.
  • Also add the macros is_normal and fpclassify mentioned in the FIXME at the end of the predicates in std::f32.

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    I-slowIssue: Problems and improvements with respect to performance of generated code.P-lowLow priority

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