further dup removal

Author: newling

mlir/lib/Dialect/Vector/IR/VectorOps.cpp

@@ -5769,10 +5769,7 @@ class ShapeCastCreateMaskFolderTrailingOneDim final
   }
 };
 
-/// Pattern to rewrite Y = ShapeCast(Broadcast(X)) as either
-///   i) Y = ShapeCast(X), or
-///  ii) Y = Broadcast(X)
-/// If both (i) and (ii) are possible, (i) is chosen.
+/// Pattern to rewrite Y = ShapeCast(Broadcast(X)) as Y = Broadcast(X)
 class ShapeCastBroadcastFolder final : public OpRewritePattern<ShapeCastOp> {
 public:
   using OpRewritePattern::OpRewritePattern;
@@ -5787,22 +5784,6 @@ class ShapeCastBroadcastFolder final : public OpRewritePattern<ShapeCastOp> {
     auto srcVectorType = dyn_cast<VectorType>(broadcastOp.getSourceType());
     bool srcIsScalar = !srcVectorType;
 
-    // Replace Y = ShapeCast(Broadcast(X)) with Y = ShapeCast(X).
-    // Example:
-    // %0 = vector.broadcast %in : vector<3x4xf32> to vector<1x3x4xf32>
-    // %1 = vector.shape_cast %0 : vector<1x3x4xf32> to vector<12xf32>
-    // to
-    // %1 = vector.shape_cast %in : vector<3x4xf32> to vector<12xf32>
-    if (srcVectorType) {
-      if (srcVectorType.getNumElements() ==
-          shapeCastOp.getResultVectorType().getNumElements()) {
-        rewriter.replaceOpWithNewOp<vector::ShapeCastOp>(
-            shapeCastOp, shapeCastOp.getResultVectorType(),
-            broadcastOp.getSource());
-        return success();
-      }
-    }
-
     // Replace Y = ShapeCast(Broadcast(X)) with Y = Broadcast(X)
     // Example
     // %0 = vector.broadcast %in : vector<3xf32> to vector<2x4x3xf32>