Create a list of inefficient hardware mappings

[jeffsetter]

The mapper is not utilizing all available operators on the CGRA efficiently:

• less than, greater than - currently using two operators (less than: gte -> not; greater than: lte -> not)
  • should be implemented using 1 CGRA tile using 1-bit flags
• max, min - currently using two operators (min: lte -> mux; max: gte -> mux)
  • should be implemented using 1 CGRA tile (alu op code 4,5)
• counter - currently using six instances (reg, 2 const, ult, add, or)
  • should be implemented using a CGRA-specific mapping
• abs - currently using five instances (mux, sge, mul, 2 const)
  • should be implemented using 1 CGRA tile (alu op code 3)

CGRA spec: https://github.com/StanfordAHA/CGRAGenerator/wiki/PE-Spec

[jeffsetter]

less than, greater than, max, min, abs all are mapping correctly now. Counter does not exist in hardware, so mapping is doing as well as possible.