MASKL(I[, KIND]) has its leftmost I bits set to 1, and the remaining bits set to 0.
Fortran 2008 and later
Elemental function
RESULT = MASKL(I[, KIND])
| I | Shall be of type INTEGER. |
| KIND | Shall be a scalar constant expression of type INTEGER. |
The return value is of type INTEGER. If KIND is present, it specifies the kind value of the return type; otherwise, it is of the default integer kind.
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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gfortran/MASKL.html