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2019 Aug 23
2
Using [GlobalISel] to provide peephole optimizations
...n theory, a lot of pattern fragments could even be added automatically, by comparing pattern fragments and the machine opcodes they represent - giving a free automatically generated "foldImmediate", among other things. A diff of the proof-of-concept can be found here: (https://paste.ee/p/aDHIg), note though it's really just a curiosity to get some conversation going, that other Selectors will reject these patterns (I haven't added their escape routes), and that you're likely to break it in many different ways. And of course that they should exist as their own table, and that...