Congzhe fbe6d79465 [LoopFusion] Fix out-of-date LoopInfo being used during fusion (#189452) ...

This is fix for
[187902](https://github.com/llvm/llvm-project/issues/187902), where
`LoopInfo` is not in a valid state at the beginning of `ScalarEvolution::createSCEVIter`.

The reason for the bug is that, `mergeLatch()` is called at a place
where control flow and dominator trees have been updated but `LoopInfo`
has not completed the update yet. `mergeLatch()` calls into
`ScalarEvolution` that uses `LoopInfo`, where out-of-date `LoopInfo` would
result in crash or unpredictable results.

This patch moves `mergeLatch()` to the place where `LoopInfo` has
completed its update and hence is in a valid state.

2026-04-06 16:35:28 -04:00

9.6 KiB

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