Please do the following three questions based on the following techniques that improve performance with additional hardware and/or code.

I. Data Forwarding

II. Software Pipelining

III. Multithreading

IV. Trace Scheduling

a. Which one(s) require a great number of additional registers? ______________________

b. Which ones(s) can support multi-issue processors? ______________________

c. Which one requires most compile-time preparations? ______________________