/GRANULARITY=option
     /GRANULARITY=QUADWORD (D)

  Determines how much memory to effectively cache for memory
  reference by the combination of the compiler and the underlying
  system.  For example, quadword granularity may require that the
  system cache quadword values in registers.  If access to data in
  the same granularity unit occurs simultaneously, corruption (by
  storing back stale values) can occur.

  Granularity has two aspects:  references inside a particular data
  segment and references between data segments.

  The options are:

   o  BYTE

   o  LONGWORD

   o  QUADWORD

  The default is /GRANULARITY=QUADWORD.