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9.166 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:
IShall 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