M437: Set or Retrieve a Bit in a String

Author(s): R. Matthews	Library: KERNLIB
Submitter: H. Grote	Submitted: 01.07.1979
Language: Assembler	Revised:

GETBIT/SETBIT find or set the value of a single bit in a bit-string which may extend across word boundaries.

Structure:

SUBROUTINE subprogram
User Entry Names: GETBIT, SETBIT

Usage:

    CALL GETBIT(I,M,L)
    CALL SETBIT(I,M,L)

I

Position of the selected bit, starting on the left with 1.

M

A word or an array, considered as a continuous string of bits.

L

Integer whose right-most bit will contain the value found by GETBIT or the value to be set by SETBIT in the I-th position of the bit-string starting at the left-most bit of the first word of M.