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Bit-handling routines

The routines in this section provide for bit packed logical arrays. The routines are compiled in-line using the Intel bit manipulation instructions. The result executes about as fast as a reference to a logical array, but the data is stored 8 or 16 or 32 times more efficiently. The bit array may be held in an array (or even a simple variable) of any type (usually INTEGER (KIND= 2)). These routines do not check that their arguments are in range, even in CHECK mode. Bits are numbered from 0. Bit 0 is the least significant bit of the first word of the array.


Clears the N'th bit of an array.


Sets the N'th bit of an array.


Sets the N'th bit of an array.


See also: Standard Fortran 95 bitwise operations



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