openpower/sv/grevlut_v2.py

   1
   2 def andor(imm, a, b, ainv, binv):
   3     inbits = [a, b, ainv, binv]
   4     res = 0
   5     for i in range(4):
   6         if ((imm >> i) & 0b1) & inbits[i]:
   7             res = 1
   8     return res
   9
  10 def dorow(imm8, step_i, chunk_size):
  11     step_o = 0
  12     for j in range(64):
  13         if (j&chunk_size) == 0:
  14            imm = (imm8 & 0b1111)
  15         else:
  16            imm = (imm8>>4)
  17         a = (step_i>>j)&1
  18         b = (step_i>>(j ^ chunk_size))&1
  19         res = andor(imm, a, b, ~a, ~b)
  20         #print(j, bin(imm), a, b, res)
  21         step_o |= (res<<j)
  22     #print ("  ", chunk_size, bin(step_o))
  23     return step_o
  24
  25 def grevlut64(RA, RB, imm, iv):
  26     x = 0
  27     if RA is None: # RA=0
  28         x = 0x5555555555555555
  29     else:
  30         x = RA
  31     if (iv): x = ~x;
  32     shamt = RB & 63;
  33     #print (bin(shamt), bin(63))
  34     for i in range(6):
  35         step = 1<<i
  36         if shamt & step:
  37             x = dorow(imm, x, step)
  38     return x & ((1<<64)-1)
  39
  40
  41 if __name__ == '__main__':
  42     imm = 0b0110
  43     a = 1
  44     b = 0
  45     print (andor(imm, a, b, ~a, ~b))
  46
  47     # answer: 8888888...
  48     RB = 0b0000
  49     imm = 0b1100_0110
  50     x = grevlut64(None, RB, imm, 1)
  51     print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
  52
  53     # answer: 8888888...
  54     RB = 0b000001
  55     imm = 0b10001000
  56     x = grevlut64(None, RB, imm, 1)
  57     print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
  58
  59     exit(0)
  60
  61     # answer: 80808080...
  62     RB = 0b00110
  63     imm = 0b11000110
  64     x = grevlut64(None, RB, imm, 1)
  65     print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
  66
  67     # answer: 80008000...
  68     RB = 0b01110
  69     imm = 0b11000110
  70     x = grevlut64(None, RB, imm, 1)
  71     print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
  72     print()
  73
  74     # answer: 01010101...
  75     RB = 0b00110
  76     imm = 0b01101100
  77     x = grevlut64(None, RB, imm, 0)
  78     print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
  79
  80     # answer: 00010001...
  81     RB = 0b01110
  82     imm = 0b01101100
  83     x = grevlut64(None, RB, imm, 0)
  84     print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
  85     print()
  86
  87     for RB in range(64):
  88         imm = 0b11000110
  89         x = grevlut64(None, RB, imm, 1)
  90         print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
  91     print()
  92
  93     for RB in range(64):
  94         imm = 0b01101100
  95         x = grevlut64(None, RB, imm, 0)
  96         print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
  97     print()
  98
  99     for RB in range(64):
 100         imm = 0b10011010
 101         x = grevlut64(None, RB, imm, 1)
 102         print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
 103     print()
 104
 105     for RB in range(64):
 106         imm = 0b01011010
 107         x = grevlut64(None, RB, imm, 1)
 108         print ("grevlut", bin(RB), bin(imm), hex(x), "\n", bin(x))
 109     print()
 110