[MemCpyOpt] Stop using callCapturesBefore() #110484
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After llvm#110280 we use EarliestEscapeInfo, so callCapturesBefore() is mostly redundant. It can provide better results in some cases because EEI does an approximation across all captures. I hope that it's good enough in practice, as this is the last remaining user of callCapturesBefore(), so we'll be able to remove this API entirely.
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Okay, it looks like the more precise analysis here does provide enough additional value to keep it... |
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…alysis (NFCI) Following up on llvm#110484, it should be possible to drop `callCaptureBefore`, whose last user is MemCpyOpt, while retaining its additional precision by encapsulating it into a dedicated CapturesBeforeAnalysis. This uses `PointerMayBeCapturedBefore` and is more precise than EarliestEscapeAnalysis, though more expensive. Also allow users to query them in chain when needed.
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After #110280 we use EarliestEscapeInfo, so callCapturesBefore() is mostly redundant. It can provide better results in some cases because EEI does an approximation across all captures. I hope that it's good enough in practice, as this is the last remaining user of callCapturesBefore(), so we'll be able to remove this API entirely.