openpower/isa/simplev.mdwn

   1 <!-- This defines instructions described in PowerISA Version 3.0 B Book 1 -->
   2
   3 <!-- These are not described in book 1 -->
   4
   5 # setvl
   6
   7 SVL-Form
   8
   9 * setvl RT, RA, SVi, vs, ms
  10 * setvl. RT, RA, SVi, vs, ms
  11
  12 Pseudo-code:
  13
  14     VLimm <- SVi + 1
  15     if vs = 1 then
  16         if _RA != 0 then
  17             VL <- (RA|0)[57:63]
  18         else
  19             VL <- VLimm[1:7]
  20     else
  21         VL <- SVSTATE[7:13]
  22     if ms = 1 then
  23         MVL <- VLimm[1:7]
  24     else
  25         MVL <- SVSTATE[0:6]
  26     if VL > MVL then
  27         VL = MVL
  28     SVSTATE[0:6] <- MVL
  29     SVSTATE[7:13] <- VL
  30     RT <- [0]*57 || VL
  31
  32 Special Registers Altered:
  33
  34     CR0                     (if Rc=1)
  35