R8 Optimization: Enum Switch Maps

Note: This post is part of a series on D8 and R8, Android’s new dexer and optimizer, respectively. For an intro to D8 read “Android’s Java 8 support”. For an intro to R8 read “R8 Optimization: Staticization”. The previous post on R8 covered enum ordinals which then allowed branch elimination to apply to a switch statement. In that post, the full bytecode for switch on an enum was omitted because there’s actually more to the optimization. Let’s start with a simple enum and a switch over its con...

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