3d_gpu/architecture/dynamic_simd/simdscope.mdwn

   1 # SimdScope
   2
   3 Links:
   4
   5 * <https://bugs.libre-soc.org/show_bug.cgi?id=734>
   6
   7 TODO
   8
   9 SimdScope is the user-facing "front" behind which SimdSignal
  10 is entirely and transparently hidden.  Aside from using it,
  11 the goal and its purpose is that
  12 developers should under no circumstances have to know
  13 that their HDL, which was initially written as scalar
  14 nmigen HDL, is behaving entirely transparently as full
  15 SIMD capable HDL.  There are a few caveats to that: some
  16 capabilities such as LHS assignment to an ast.Part are so
  17 complex in a SIMD context that SimdSignal in its first
  18 version does not implement it.  Array is out at the moment
  19 as well.  Over time this may change.
  20
  21 SimdScope is used as follows:
  22
  23     m = Module()
  24     elwid = Signal(2)
  25     vec_el_counts = { 0b00: 64, 0b01: 32