Lahey/GNU Fortran

Next: , Previous: LCOBOUND, Up: Intrinsic Procedures


8.142 LEADZ — Number of leading zero bits of an integer

Description:
LEADZ returns the number of leading zero bits of an integer.
Standard:
Fortran 2008 and later
Class:
Elemental function
Syntax:
RESULT = LEADZ(I)
Arguments:

I Shall be of type INTEGER.

Return value:
The type of the return value is the default INTEGER. If all the bits of I are zero, the result value is BIT_SIZE(I).
Example:
          PROGRAM test_leadz
            WRITE (*,*) BIT_SIZE(1)  ! prints 32
            WRITE (*,*) LEADZ(1)     ! prints 31
          END PROGRAM
     

See also:
BIT_SIZE, TRAILZ, POPCNT, POPPAR