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
Elemental Intrinsic Function (Specific): Returns the number of leading zero bits in an integer.
The result type is default integer. The result value is the number of leading zeros in the binary representation of the integer i.
The model for the interpretation of an integer value as a sequence of bits is shown in Model for Bit Data.