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W as a temporary variable
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When a content of W register is preserved, it can be used as a temporary variable.

 

if ( byte & mask )

  bufferCOM[ 0 ]  = 0xAB;

else

  bufferCOM[ 0 ]  = 0xCD;

if ( byte & mask )

  W = 0xAB;

else

  W = 0xCD;

bufferCOM[ 0 ] = W;