[Mlir-commits] [mlir] [llvm] [mlir][tensor] Fold linalg transpose with tensor pack (PR #74206)

[lorenzo chelini]

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@@ -81,10 +82,86 @@ struct FoldUnpackWithExtractSliceOp : public OpRewritePattern<ExtractSliceOp> {
     return success();
   }
 };
+
+/// Fold 'pack' -> 'transpose' into 'pack' since 'pack' already has transpose
+/// semantics.
+struct FoldProducerPackWithConsumerLinalgTransposeOp
+    : public OpRewritePattern<linalg::TransposeOp> {
+  using OpRewritePattern<linalg::TransposeOp>::OpRewritePattern;
+
+  LogicalResult matchAndRewrite(linalg::TransposeOp transposeOp,
+                                PatternRewriter &rewriter) const override {
+    auto transposeInputTensor = transposeOp.getOperand(0);
+    auto packOp = transposeInputTensor.getDefiningOp<PackOp>();
+
+    if (!packOp)
+      return failure();
+
+    auto packOuterDimsPerm = packOp.getOuterDimsPerm();
+    auto transposePerm = transposeOp.getPermutation();
+    llvm::SmallVector<int64_t> newPackOuterDimsPermVec;
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chelini wrote:

please drop `llvm::`.

https://github.com/llvm/llvm-project/pull/74206