| This is a list of things that need to be worked on. It is by no means complete. |
| |
| Allocation |
| - Allocation of decls in stackalloc. Decls survive if they are |
| addrtaken or are too large for registerization. |
| |
| Scheduling |
| - Make sure loads are scheduled correctly with respect to stores. |
| Same for flag type values. We can't have more than one value of |
| mem or flag types live at once. |
| - Reduce register pressure. Schedule instructions which kill |
| variables first. |
| |
| Values |
| - Add a line number field. Figure out how to populate it and |
| maintain it during rewrites. |
| - Store *Type instead of Type? Keep an array of used Types in Func |
| and reference by id? Unify with the type ../gc so we just use a |
| pointer instead of an interface? |
| - Recycle dead values instead of using GC to do that. |
| - A lot of Aux fields are just int64. Add a separate AuxInt field? |
| If not that, then cache the interfaces that wrap int64s. |
| - OpStore uses 3 args. Increase the size of argstorage to 3? |
| |
| Opcodes |
| - Rename ops to prevent cross-arch conflicts. MOVQ -> MOVQamd64 (or |
| MOVQ6?). Other option: build opcode table in Config instead of globally. |
| - Remove asm string from opinfo, no longer needed. |
| - It's annoying to list the opcode both in the opcode list and an |
| opInfo map entry. Specify it one place and use go:generate to |
| produce both? |
| |
| Regalloc |
| - Make less arch-dependent |
| - Don't spill everything at every basic block boundary. |
| - Allow args and return values to be ssa-able. |
| - Handle 2-address instructions. |
| |
| Rewrites |
| - Strength reduction (both arch-indep and arch-dependent?) |
| - Code sequence for shifts >= wordsize |
| - Start another architecture (arm?) |
| |
| Common-Subexpression Elimination |
| - Make better decision about which value in an equivalence class we should |
| choose to replace other values in that class. |
| - Can we move control values out of their basic block? |
