JTB

from The Free On-line Dictionary of Computing (8 July 2008)
jump trace buffer
JTB

   (JTB) A feature of some {pipelined} processors (e.g. {Amulet},
   {Pentium}?) which stores the source and destination addresses
   of the last few branch instuctions executed.  When a branch
   instruction is fetched, its source is looked for in the JTB.
   If found, the next instuction fetch will be from the previous
   destination of that branch.  If it turns out that the branch
   shouldn't have been taken this time, then the {pipeline} is
   flushed.  This means that in a {tight loop} it is not
   necessary to flush the {pipeline} every time you jump back to
   the start.

   (1994-12-15)