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3 Commits

Author SHA1 Message Date
David Zarzycki
54ea315586 [Basic] NFC: Stop using transparent unions 2017-12-16 10:43:49 -05:00
David Zarzycki
68a846e761 [AST] NFC: Do not hard code bit size of 'Kind' field 
Also, give each class hierarchy at least 8 bits for the 'Kind' field.
In practice, no class hierarchy has more than 256 nodes, so this
optimizees code generation to make isa/dyn_cast faster.
 2017-12-15 14:45:38 -05:00
David Zarzycki
97541e0d1e [Basic] NFC: Standardize and simplify inline bitfields 
Inline bitfields are a common design pattern in LLVM and derived
projects, but the associated boilerplate can be demotivating and
brittle. This new header makes it easier to define and use inline
bitfields in Swift.

This also reorders some fields for better code generation.
 2017-12-15 14:14:59 -05:00