David Zarzycki 77a29c9551 [AST] Perf: Improve getDesugaredType() efficiency ...

Make getDesugaredType() as fast as possible for now. With the old way:

1) Switching over the sugared types turned into a frequently
   mispredicted branch because the sugar in the type system is random
   as far as the processor is concerned.
2) Storing the underlying/singlely-desugared type at different offsets
   in memory adds more code bloat and misprediction.

Short of a major redesign to avoid pointer chasing, this is probably as
fast as the method will get.

2018-01-03 09:45:48 -05:00

5.5 KiB

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