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diff --git a/chapter19/README.md b/chapter19/README.md index a866876d..752e139f 100644 --- a/chapter19/README.md +++ b/chapter19/README.md @@ -3,6 +3,20 @@ You can also read [this chapter](https://github.com/SeaOfNodes/Simple/tree/linear-chapter19) in a linear Git revision history on the [linear](https://github.com/SeaOfNodes/Simple/tree/linear) branch and [compare](https://github.com/SeaOfNodes/Simple/compare/linear-chapter18...linear-chapter19) it to the previous chapter. +## Meta-Issues / Code-Dev Issues of Instruction Selection, Register Allocation and Encodings + +The output of Instruction Selection - the mapping from idealized Simple Nodes +to machine-specific ones - is difficult to test in bulk without an execution +strategy. We won't have an execution stratgy until all three of Instruction +Selection, Register Allocation and Encodings are done. Hence in and around the +completion of Encoding we expect to find lots of bugs in Instruction Selection +and Register Allocation. We certainly hand-inspect the output and fix obvious +problems, but still lots bugs linger until we can actually run the code. + +This means that other chapters have updates and bug-fixes to the work being +described here. + + ## Portable Compilation A new abstract `Machine` class is added, one per unique CPU port. `Machine` |