インテル® Fortran コンパイラー 14.0 ユーザー・リファレンス・ガイド
Elemental Intrinsic Function (Specific): Returns the number of trailing zero bits in an integer.
The result type is default integer. The result value is the number of trailing 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.