src/openpower/decoder/isa/svshape.py

   1 """provides convenient field mappings for SVSHAPE in different modes
   2
   3 the trickiest is Indexed mode which sits inside Matrix using two of
   4 permute options to activate.
   5
   6 https://libre-soc.org/openpower/sv/remap
   7 """
   8
   9 from openpower.decoder.selectable_int import (FieldSelectableInt, SelectableInt,
  10                                         selectconcat)
  11 from openpower.decoder.isa.remapyield import iterate_indices
  12 from openpower.decoder.isa.remap_fft_yield import iterate_butterfly_indices
  13 from openpower.decoder.isa.remap_dct_yield import (
  14                                 iterate_dct_inner_butterfly_indices,
  15                                 iterate_dct_inner_costable_indices,
  16                                 iterate_dct_outer_butterfly_indices,
  17                                 iterate_dct_inner_halfswap_loadstore)
  18 from openpower.sv.svp64 import SVP64SHAPE
  19 import os
  20 from copy import deepcopy
  21 from openpower.util import log
  22
  23
  24 class SVSHAPE(SelectableInt):
  25     def __init__(self, value):
  26         SelectableInt.__init__(self, value, 32)
  27         offs = 0
  28         # set up sub-fields from Record layout
  29         self.fsi = {}
  30         l = deepcopy(SVP64SHAPE.layout)
  31         l.reverse()
  32         for field, width in l:
  33             end =  offs+width
  34             fs = tuple(range(offs, end))
  35             v = FieldSelectableInt(self, fs)
  36             self.fsi[field] = v
  37             log("SVSHAPE setup field", field, offs, end)
  38             offs = end
  39
  40     def is_indexed(self):
  41         "REMAP Indexed Mode"
  42         return self.mode == 0b00 and self.submode2 in [0b110, 0b111]
  43
  44     @property
  45     def submode2(self):
  46         return self.fsi['permute'].asint(msb0=True)
  47
  48     @submode2.setter
  49     def submode2(self, value):
  50         self.fsi['permute'].eq(value)
  51
  52     @property
  53     def order(self):
  54         permute = self.fsi['permute'].asint(msb0=True)
  55         if self.is_indexed():
  56             permute -= 0b110 # xyz or yxz
  57         return SVP64SHAPE.order(permute)
  58
  59     @order.setter
  60     def order(self, value):
  61         rorder = SVP64SHAPE.rorder(value)
  62         self.fsi['permute'].eq(rorder)
  63
  64     @property
  65     def xdimsz(self):
  66         return self.fsi['xdimsz'].asint(msb0=True)+1
  67
  68     @xdimsz.setter
  69     def xdimsz(self, value):
  70         self.fsi['xdimsz'].eq(value-1)
  71
  72     @property
  73     def ydimsz(self):
  74         return self.fsi['ydimsz'].asint(msb0=True)+1
  75
  76     @ydimsz.setter
  77     def ydimsz(self, value):
  78         self.fsi['ydimsz'].eq(value-1)
  79
  80     @property
  81     def svgpr(self):
  82         return self.fsi['zdimsz'].asint(msb0=True) << 1
  83
  84     @property
  85     def zdimsz(self):
  86         z = self.fsi['zdimsz'].asint(msb0=True)+1
  87         if self.is_indexed():
  88             z = 1 # no z dimension when indexed
  89         return z
  90
  91     @zdimsz.setter
  92     def zdimsz(self, value):
  93         self.fsi['zdimsz'].eq(value-1)
  94
  95     @property
  96     def lims(self):
  97         return [self.xdimsz, self.ydimsz, self.zdimsz]
  98
  99     @lims.setter
 100     def lims(self, value):
 101         self.xdimsz = value[0]
 102         self.ydimsz = value[1]
 103         self.zdimsz = value[2]
 104
 105     @property
 106     def invxyz(self):
 107         inv = self.fsi['invxyz'].asint(msb0=True)
 108         if self.is_indexed():
 109             inv &= 0b011 # no 3rd z in indexed mode
 110         return [(inv & 0b1), (inv & 0b10) >> 1, (inv & 0b100) >> 2]
 111
 112     @invxyz.setter
 113     def invxyz(self, value):
 114         self.fsi['invxyz'].eq(value[0] | (value[1]<<1) | (value[2]<<2))
 115
 116     @property
 117     def mode(self):
 118         return self.fsi['mode'].asint(msb0=True)
 119
 120     @mode.setter
 121     def mode(self, value):
 122         self.fsi['mode'].eq(value)
 123
 124     @property
 125     def elwid(self):
 126         return self.fsi['skip'].asint(msb0=True)
 127
 128     @property
 129     def skip(self):
 130         if self.is_indexed():
 131             inv = self.fsi['invxyz'].asint(msb0=True)
 132             return (inv & 0b100) >> 2
 133         return self.fsi['skip'].asint(msb0=True)
 134
 135     @skip.setter
 136     def skip(self, value):
 137         self.fsi['skip'].eq(value)
 138
 139     @property
 140     def offset(self):
 141         return self.fsi['offset'].asint(msb0=True)
 142
 143     @offset.setter
 144     def offset(self, value):
 145         self.fsi['offset'].eq(value)
 146
 147     def get_iterator(self):
 148         log ("SVSHAPE get_iterator", self.mode, self.ydimsz)
 149         if self.mode == 0b00:
 150             iterate_fn = iterate_indices
 151         elif self.mode in [0b01, 0b11]:
 152             # further sub-selection
 153             if self.ydimsz == 1:
 154                 iterate_fn = iterate_butterfly_indices
 155             elif self.ydimsz in [2, 4]:
 156                 iterate_fn = iterate_dct_inner_butterfly_indices
 157             elif self.ydimsz == 3:
 158                 iterate_fn = iterate_dct_outer_butterfly_indices
 159             elif self.ydimsz in [5, 13]:
 160                 iterate_fn = iterate_dct_inner_costable_indices
 161             elif self.ydimsz in [6, 14, 15]:
 162                 iterate_fn = iterate_dct_inner_halfswap_loadstore
 163         # create a **NEW** iterator each time this is called
 164         return iterate_fn(deepcopy(self))
 165
 166
 167 if __name__ == '__main__':
 168     os.environ['SILENCELOG'] = "1"
 169     xdim = 3
 170     ydim = 2
 171     zdim = 1
 172     SVSHAPE0 = SVSHAPE(0)
 173     SVSHAPE0.lims = [xdim, ydim, zdim]
 174     SVSHAPE0.order = [1,0,2]  # experiment with different permutations, here
 175     SVSHAPE0.mode = 0b00
 176     SVSHAPE0.skip = 0b00
 177     SVSHAPE0.offset = 0       # experiment with different offset, here
 178     SVSHAPE0.invxyz = [0,0,0] # inversion if desired
 179
 180     VL = xdim * ydim * zdim
 181
 182     print ("Matrix Mode")
 183     for idx, new_idx in enumerate(SVSHAPE0.get_iterator()):
 184         if idx >= VL:
 185             break
 186         print ("%d->%d" % (idx, new_idx))
 187
 188     print ("")
 189     print ("FFT Mode")
 190
 191     # set the dimension sizes here
 192     xdim = 8
 193     ydim = 0 # not needed
 194     zdim = 0 # again, not needed
 195
 196     # set total. err don't know how to calculate how many there are...
 197     # do it manually for now
 198
 199     VL = 0
 200     size = 2
 201     n = xdim
 202     while size <= n:
 203         halfsize = size // 2
 204         tablestep = n // size
 205         for i in range(0, n, size):
 206             for j in range(i, i + halfsize):
 207                 VL += 1
 208         size *= 2
 209
 210     # j schedule
 211     SVSHAPE0 = SVSHAPE(0)
 212     SVSHAPE0.lims = [xdim, ydim, zdim]
 213     SVSHAPE0.order = [0,1,2]  # experiment with different permutations, here
 214     SVSHAPE0.mode = 0b00
 215     SVSHAPE0.offset = 0       # experiment with different offset, here
 216     SVSHAPE0.invxyz = [0,0,0] # inversion if desired
 217     # j+halfstep schedule
 218     SVSHAPE1 = SVSHAPE(0)
 219     SVSHAPE1.lims = [xdim, ydim, zdim]
 220     SVSHAPE1.order = [0,1,2]  # experiment with different permutations, here
 221     SVSHAPE1.mode = 0b01
 222     SVSHAPE1.offset = 0       # experiment with different offset, here
 223     SVSHAPE1.invxyz = [0,0,0] # inversion if desired
 224     # k schedule
 225     SVSHAPE2 = SVSHAPE(0)
 226     SVSHAPE2.lims = [xdim, ydim, zdim]
 227     SVSHAPE2.order = [0,1,2]  # experiment with different permutations, here
 228     SVSHAPE2.mode = 0b10
 229     SVSHAPE2.offset = 0       # experiment with different offset, here
 230     SVSHAPE2.invxyz = [0,0,0] # inversion if desired
 231
 232     # enumerate over the iterator function, getting new indices
 233     schedule = []
 234     for idx, (jl, jh, k) in enumerate(zip(iterate_indices(SVSHAPE0),
 235                                           iterate_indices(SVSHAPE1),
 236                                           iterate_indices(SVSHAPE2))):
 237         if idx >= VL:
 238             break
 239         schedule.append((jl, jh, k))
 240
 241     # ok now pretty-print the results, with some debug output
 242     size = 2
 243     idx = 0
 244     while size <= n:
 245         halfsize = size // 2
 246         tablestep = n // size
 247         print ("size %d halfsize %d tablestep %d" % \
 248                 (size, halfsize, tablestep))
 249         for i in range(0, n, size):
 250             prefix = "i %d\t" % i
 251             k = 0
 252             for j in range(i, i + halfsize):
 253                 jl, jh, ks = schedule[idx]
 254                 print ("  %-3d\t%s j=%-2d jh=%-2d k=%-2d -> "
 255                         "j[jl=%-2d] j[jh=%-2d] exptable[k=%d]" % \
 256                                 (idx, prefix, j, j+halfsize, k,
 257                                       jl, jh, ks))
 258                 k += tablestep
 259                 idx += 1
 260         size *= 2
 261