R32V2020 Shift/Rotate operations

Shift, Rotate, Swap Operations

ls1 - Shift Left by one

• Uses r1 for count
  • Provides future possibilities for different shifts

rs1 - Shift Right by one

• Uses r1 for count
  • Provides future possibilities for different shifts

lr1 - Rotate Left by one

• Uses r1 for count
  • Provides future possibilities for different shifts

rr1 - Rotate Right by one

• Wraps around but that would shift off with rs1
• Uses r1 for count
  • Provides future possibilities for different shifts

ra1 - Arithmetic shift right

• Extendeds sign bit
• Uses r1 for count
  • Provides future possibilities for different shifts

ens - Swap Endian order of a long

• Swap around the endian-ness of a long

Wish List

• Implement larger shift in future builds?
  • Implement barrel shifter
    • Large mux or by hot decoder and multiplier
      • To left shift by n, do 2^n and multiply
      • Need space tradeoof