[SLP]Do not reuse transformed nodes in gathers emitted before their user
Gathers of the users with all scalars used outside the block are emitted
before the user, while the transformed nodes are emitted with the user.
Reusing such a transformed node postponed the gather and moved only the
last instruction of the transformed node buildvector, breaking dominance.
Fixes #226674
Reviewers:
Pull Request: https://github.com/llvm/llvm-project/pull/226687
resterm: Update to 1.9.1
This patch fixes two bugs from 1.9.0.
The Profile tab is now visible while a profile runs,
and vars.get no longer returns template text when a
@const has the same name.
[mlir] Avoid rewriting unreachable blocks in the greedy driver
A rewrite can disconnect a block after the iteration's initial CFG sweep.
Track reachability through rewriter notifications and skip worklist
operations in unreachable blocks until the next iteration removes them.
Cache reachability per region and compare final successors after each
rewrite. Preserve the cache for successor-equivalent changes, added edges,
and block merges that keep surviving blocks reachable. Recompute for other
CFG changes, including entry changes and cross-region block moves.
Keep cache updates separate from reachability queries, returning failure
when a full traversal is required. Collect each successor set once for
validation and retain compact vector snapshots in the cache. Check
containing blocks when querying operations in nested regions, caching the
ancestor result until listener notifications invalidate it.
Cover inserted and redirected blocks, blocks connected before rewrite
completion, nested regions, block moves and merges, and explicit op lists.
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