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
  36 # svremap
  37
  38 SVM-Form
  39
  40 * svremap SVxd, SVyd, SVzd, SVRM
  41
  42 Pseudo-code:
  43
  44     # hack: clear out all SVSHAPEs and set them up for multiply
  45     SVSHAPE0[0:31] <- [0] * 32
  46     SVSHAPE1[0:31] <- [0] * 32
  47     SVSHAPE2[0:31] <- [0] * 32
  48     SVSHAPE3[0:31] <- [0] * 32
  49     # set up template in SVSHAPE0, then copy to 1-3
  50     SVSHAPE0[0:5] <- (0b0 || SVxd)   # xdim
  51     SVSHAPE0[6:11] <- (0b0 || SVyd)   # ydim
  52     SVSHAPE0[12:17] <- (0b0 || SVzd)   # zdim
  53     SVSHAPE0[28:29] <- 0b11           # skip z
  54     # copy
  55     SVSHAPE1[0:31] <- SVSHAPE0[0:31]
  56     SVSHAPE2[0:31] <- SVSHAPE0[0:31]
  57     SVSHAPE3[0:31] <- SVSHAPE0[0:31]
  58     # set up FRA
  59     SVSHAPE1[18:20] <- 0b001          # permute x,z,y
  60     SVSHAPE1[28:29] <- 0b01           # skip z
  61     # FRC
  62     SVSHAPE2[18:20] <- 0b001          # permute x,z,y
  63     SVSHAPE2[28:29] <- 0b11           # skip y
  64
  65 Special Registers Altered:
  66
  67     None
  68