[PATCH] D83595: [Draft][MSAN] Optimize away poisoning allocas that are always written before load

[Evgenii Stepanov via Phabricator via llvm-commits]

eugenis added a comment.

In D83595#2188282 <https://reviews.llvm.org/D83595#2188282>, @guiand wrote:

> The code currently scans from the alloca, rather than from the lifetime_start. This might make only searching in single BB pretty limiting, since afaict an alloca can be detached from its lifetime region.

Oh right. That's actually pretty weak, it's very common for lifetime to start in a basic block other than entry.


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https://reviews.llvm.org/D83595