| This is a list of things that need to be worked on. It will hopefully |
| be complete soon. |
| |
| Correctness |
| ----------- |
| - Debugging info (check & fix as much as we can) |
| |
| Optimizations (better compiled code) |
| ------------------------------------ |
| - Reduce register pressure in scheduler |
| - More strength reduction: multiply -> shift/add combos (Worth doing?) |
| - Add a value range propagation pass (for bounds elim & bitwidth reduction) |
| - Make dead store pass inter-block |
| - If there are a lot of MOVQ $0, ..., then load |
| 0 into a register and use the register as the source instead. |
| - Allow arrays of length 1 (or longer, with all constant indexes?) to be SSAable. |
| - If strings are being passed around without being interpreted (ptr |
| and len fields being accessed) pass them in xmm registers? |
| Same for interfaces? |
| - Non-constant rotate detection. |
| - Do 0 <= x && x < n with one unsigned compare |
| - nil-check removal in indexed load/store case: |
| lea (%rdx,%rax,1),%rcx |
| test %al,(%rcx) // nil check |
| mov (%rdx,%rax,1),%cl // load to same address |
| - any pointer generated by unsafe arithmetic must be non-nil? |
| (Of course that may not be true in general, but it is for all uses |
| in the runtime, and we can play games with unsafe.) |
| |
| Optimizations (better compiler) |
| ------------------------------- |
| - Handle signed division overflow and sign extension earlier |
| |
| Regalloc |
| -------- |
| - Make less arch-dependent |
| - Handle 2-address instructions |
| - Make liveness analysis non-quadratic |
| |
| Future/other |
| ------------ |
| - Start another architecture (arm?) |
| - 64-bit ops on 32-bit machines |
| - Should we get rid of named types in favor of underlying types during SSA generation? |
| - Infrastructure for enabling/disabling/configuring passes |
| - Modify logging for at least pass=1, to be Warnl compatible |
