[Mlir-commits] [mlir] [MLIR] Add logging to eraseUnreachableBlocks (NFC) (PR #153968)

[Jacques Pienaar]

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@@ -182,19 +185,34 @@ SmallVector<Value> mlir::makeRegionIsolatedFromAbove(
 // TODO: We could likely merge this with the DCE algorithm below.
 LogicalResult mlir::eraseUnreachableBlocks(RewriterBase &rewriter,
                                            MutableArrayRef<Region> regions) {
+  LDBG() << "Starting eraseUnreachableBlocks with " << regions.size()
+         << " regions";
+
   // Set of blocks found to be reachable within a given region.
   llvm::df_iterator_default_set<Block *, 16> reachable;
   // If any blocks were found to be dead.
-  bool erasedDeadBlocks = false;
+  int erasedDeadBlocks = 0;
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jpienaar wrote:

If this weren't a util, a statistic would have been useful for additional reporting.

https://github.com/llvm/llvm-project/pull/153968