[Mlir-commits] [llvm] [mlir] Number MLIR blocks; require GraphHasNodeNumbers in llvm::LoopInfoBase (PR #207617)

[Alexis Engelke]

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@@ -422,6 +435,10 @@ class alignas(8) Block : public IRObjectWithUseList<BlockOperand>,
   /// the operations within this block have a valid ordering.
   llvm::PointerIntPair<Region *, /*IntBits=*/1, bool> parentValidOpOrderPair;
 
+  /// Unique number of this block within its parent region, assigned when the
+  /// block is added to a region. See getNumber().
+  unsigned blockNumber = 0;
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aengelke wrote:

Initialize with -1u to signal "invalid number". Is there no way blocks can be removed without being erased from a region?

https://github.com/llvm/llvm-project/pull/207617