Peephole optimizations involve scanning through a sequence of instructions, recognizing a specific short sequence of instructions and replacing it with a better short sequence or with a better individual instruction. It's largely used to clean up artifacts from earlier code-generation passes (e.g. such as the same constant being loaded into a register more than once). Peephole optimizations are extremely local, usually affecting just the stream of instructions and nothing else.

While Dalvik does recognize the pattern of a specific short sequence of instructions that carry out an array initialization, it extracts the data from those instructions and puts it in an initialized data segment. This is transformative and not really a peephole optimization.

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