openpower/sv/byteswap.mdwn

   1 # Byte-swapping
   2
   3 ## Byte-swapping Mux
   4
   5 gate count for 4:1 MUX is estimated at 40 gates.  8x 40 gates for a total of 320 gates to provide aligned byteswapping 64 bit.
   6
   7 <img alt="Byte-swap mux diagram" src="../byteswap_mux.svg" width="100%"/>
   8
   9 ## Byte-swapping Pipe
  10
  11 per source and dest operand, 320 gates required.  if two source operands (ALU pipeline, Logical pipeline) this totals 960 gates (per Function Unit).  3 operands (madd) is 1280 gates.  for an estimated 50 Function Units this totals around 50,000 gates.
  12
  13 <img alt="Byte-swap pipe diagram" src="../byteswap_pipe.svg" width="100%"/>