[Mlir-commits] [mlir] [mlir][vector] Add InsertInsertToInsert to insert op canonicalize patterns (PR #147045)

[Mehdi Amini]

================
@@ -3335,6 +3335,28 @@ class InsertSplatToSplat final : public OpRewritePattern<InsertOp> {
   }
 };
 
+/// Pattern to rewrite a InsertOp(InsertOp) to InsertOp.
+class InsertInsertToInsert final : public OpRewritePattern<InsertOp> {
+public:
+  using OpRewritePattern::OpRewritePattern;
+  LogicalResult matchAndRewrite(InsertOp op,
+                                PatternRewriter &rewriter) const override {
+    auto destInsert = op.getDest().getDefiningOp<InsertOp>();
+    if (!destInsert)
+      return failure();
+
+    if (!destInsert->hasOneUse())
+      return failure();
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joker-eph wrote:

I still don't understand, Can you provide an example where there are multiple uses and you don't want to fold?

https://github.com/llvm/llvm-project/pull/147045