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2 definitions found
 for bit bashing
From The Jargon File (version 4.4.7, 29 Dec 2003) :

  bit bashing
   n.
  
      (alt.: bit diddling or bit twiddling) Term used to describe any of
      several kinds of low-level programming characterized by manipulation of {
      bit, flag, nybble, and other smaller-than-character-sized pieces of
      data; these include low-level device control, encryption algorithms,
      checksum and error-correcting codes, hash functions, some flavors of
      graphics programming (see bitblt), and assembler/compiler code
      generation. May connote either tedium or a real technical challenge (more
      usually the former). ?The command decoding for the new tape driver looks
      pretty solid but the bit-bashing for the control registers still has bugs.?
      See also mode bit.
  

From The Free On-line Dictionary of Computing (18 March 2015) :

  bit bashing
  bit diddling
  
     (Also "bit diddling" or bit twiddling).  Any of several
     kinds of low-level programming characterised by manipulation
     of bit, flag, nibble, and other
     smaller-than-character-sized pieces of data.  These include
     low-level device control, encryption algorithms, checksum and
     error-correcting codes, hash functions, some flavours of
     graphics programming (see bitblt), and assembler/compiler
     code generation.  May connote either tedium or a real
     technical challenge (more usually the former).  "The command
     decoding for the new tape driver looks pretty solid but the
     bit-bashing for the control registers still has bugs."  See
     also bit bang, mode bit.
  

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