xazax.hun added inline comments.
================
Comment at: clang/lib/Analysis/LiveVariables.cpp:522
- // FIXME: we should enqueue using post order.
- for (const CFGBlock *B : cfg->nodes()) {
+ for (const CFGBlock *B : *AC.getAnalysis<PostOrderCFGView>()) {
worklist.enqueueBlock(B);
----------------
With `BackwardDataflowWorklist`, each `enqueueBlock` will insert the block
into a `llvm::PriorityQueue`. So regardless of the insertion order, `dequeue`
will return the nodes in the reverse post order.
Inserting elements in the right order into the heap might be beneficial is we
need to to less work to "heapify". But on the other hand, we did more work to
insert them in the right order, in the first place. All in all, I am not sure
whether the comment is still valid and whether this patch would provide any
benefit over the original code.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D87519/new/
https://reviews.llvm.org/D87519
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