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35 .Nd test for finite value
41 .Fn isfinite "real-floating x"
45 determines whether its argument
48 An argument represented in a format wider than its semantic type is
49 converted to its semantic type first.
50 The determination is then based on the type of the argument.
52 It is determined whether the value of
54 is zero, subnormal, or normal, and neither infinite nor NaN.
56 It is determined whether the value of
58 is true zero or finite, and neither dirty zero nor ROP.
62 macro returns a non-zero value if the value of
65 Otherwise 0 is returned.
67 No errors are defined.