[Mlir-commits] [mlir] Fix block merging (PR #97697)

[Jakub Kuderski]

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@@ -674,6 +679,64 @@ static bool ableToUpdatePredOperands(Block *block) {
   return true;
 }
 
+/// Prunes the redundant list of arguments. E.g., if we are passing an argument
+/// list like [x, y, z, x] this would return [x, y, z] and it would update the
+/// `block` (to whom the argument are passed to) accordingly
+static void
+pruneRedundantArguments(SmallVector<SmallVector<Value, 8>, 2> &newArguments,
+                        RewriterBase &rewriter, Block *block) {
+  SmallVector<SmallVector<Value, 8>, 2> newArgumentsPruned(
+      newArguments.size(), SmallVector<Value, 8>());
+
+  if (!newArguments.empty()) {
+    llvm::DenseMap<unsigned, unsigned> toReplace;
+    // Go through the first list of arguments (list 0)
+    for (unsigned j = 0; j < newArguments[0].size(); j++) {
+      bool shouldReplaceJ = false;
+      unsigned replacement = 0;
+      // Look back to see if there are possible redundancies in
+      // list 0
+      for (unsigned k = 0; k < j; k++) {
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kuhar wrote:

Same here.

https://github.com/llvm/llvm-project/pull/97697