インテル® Fortran コンパイラー XE 13.1 ユーザー・リファレンス・ガイド
Inquiry Intrinsic Function (Generic): Returns the smallest number in the model representing the same type and kind parameters as the argument.
The result is a scalar with the same type and kind parameters as x. The result has the value b emin - 1. Parameters b and emin are defined in Model for Real Data.