Further steps to eliminate unnecessary MemCpys in LLVM

2023/07/04

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The article discusses the implementation of a new transformation in LLVM that aims to eliminate unnecessary MemCpys. The transformation unifies two allocates on the same basic block if certain conditions are met. These conditions include the source being fully copied to the destination by memcpy, memmove, or store&load, and both the source and destination being static allocas that are unescaped. Additionally, the destination should have no write operations except for full-sized lifetime intrinsic and copy itself. The article also mentions some improvements and fixes that are being worked on.

Developers interested in optimizing memory operations in LLVM can benefit from this new transformation. The article provides code snippets and highlights the conditions that need to be satisfied for the transformation to occur. It also mentions some potential issues and improvements that are being addressed. This information can help developers understand the current state of the transformation and contribute to its development.