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2.1.2.3 Denormalized Floats

CMUCL supports IEEE denormalized floats. Denormalized floats provide a mechanism for gradual underflow. The Common Lisp float-precision function returns the actual precision of a denormalized float, which will be less than float-digits. Note that in order to generate (or even print) denormalized floats, trapping must be disabled for the underflow exception (see float-traps.) The Common Lisp least-positive-format-float constants are denormalized.

Function: extensions:float-denormalized-p x ¶

This function returns true if x is a denormalized float. x must be a float.