[PATCH] D91562: [LSR] Drop poison flags for post-inc IVs (PR46943)

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

The approach here doesn't look right to me. Poison flags have no relation to the position where a certain instruction is executed. What's relevant is where the instruction is used.

This transform adds a new poison-is-UB user to the post-inc IV. Whereever that code is, should be the place that drops poison flags. The code is pretty convoluted though, so I didn't immediately spot where that happens.


Repository:
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https://reviews.llvm.org/D91562