Week 10/46

Exercises on optimization

1. Consider the following two proposals for new peephole patterns. Are they sound? How would those that are sound look as C-code? Would they ever be relevant?
   • Replace

     ldc_string "..."
     dup
     ifnull L
     

     by

     ldc_string "..."
     

   • Replace

     return
     <<anything>>
     

     by

     return
     

2. Study and discuss the contents of the WIG run-time library runwig.c.
3. Discuss general aspects of WIG code generation.
4. What kinds of optimizations would be relevant for WIG programs?
5. Study the code for optimizing JOOS programs.