openpower/isa/byterev.mdwn

   1 <!-- This defines instructions described in PowerISA Version 3.1B Book I -->
   2 <!-- Section 3.3.16 Byte-Reverse Instructions page 119 (145) -->
   3
   4 # Byte-Reverse Halfword
   5
   6 X-Form
   7
   8 * brh RA,RS
   9
  10 Pseudo-code:
  11
  12     RA <- ((RS)[8:15]  || (RS)[0:7]   ||
  13            (RS)[24:31] || (RS)[16:23] ||
  14            (RS)[40:47] || (RS)[32:39] ||
  15            (RS)[56:63] || (RS)[48:55])
  16
  17 Special Registers Altered:
  18
  19     None
  20
  21 # Byte-Reverse Word
  22
  23 X-Form
  24
  25 * brw RA,RS
  26
  27 Pseudo-code:
  28
  29     RA <- ((RS)[24:31] || (RS)[16:23] ||
  30            (RS)[8:15]  || (RS)[0:7]   ||
  31            (RS)[56:63] || (RS)[48:55] ||
  32            (RS)[40:47] || (RS)[32:39])
  33
  34 Special Registers Altered:
  35
  36     None
  37
  38 # Byte-Reverse Doubleword
  39
  40 X-Form
  41
  42 * brd RA,RS
  43
  44 Pseudo-code:
  45
  46     RA <- ((RS)[56:63] || (RS)[48:55] ||
  47            (RS)[40:47] || (RS)[32:39] ||
  48            (RS)[24:31] || (RS)[16:23] ||
  49            (RS)[8:15]  || (RS)[0:7])
  50
  51 Special Registers Altered:
  52
  53     None
  54