simple_v_extension/specification/ld.x.mdwn

   1 # LD.X and LD.Swizzle
   2
   3 See <http://bugs.libre-riscv.org/show_bug.cgi?id=139>
   4
   5 SV is based on vectorisation of scalar opcodes. LD and ST from scalar RISCV can be extended by either rd or rs1 being vectorised, however a third "immediate element strided" multiples do not fit.
   6
   7 In addition, Vulkan requires swizzled LD/ST covering:
   8
   9 * constant 0, 1
  10 * min/max int/uint
  11 * 1.0 and
  12 * x, y, z, or w.
  13