[Mlir-commits] [mlir] [MLIR] Add shape propagation through tensor.pad (PR #136681)

[llvmlistbot at llvm.org]

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@@ -1100,6 +1100,198 @@ class FoldPadWithProducerReshapeOpByExpansion
   ControlFusionFn controlFoldingReshapes;
 };
 
+/// Pattern to fold a tensor.expand_shape op with its producer tensor.pad op
+/// by bubbling the expand_shape before the pad.
+struct FoldReshapeWithProducerPadOpByExpansion
+    : public OpRewritePattern<tensor::ExpandShapeOp> {
+
+  FoldReshapeWithProducerPadOpByExpansion(MLIRContext *context,
+                                          ControlFusionFn foldReshapes,
+                                          PatternBenefit benefit = 1)
+      : OpRewritePattern<tensor::ExpandShapeOp>(context, benefit),
+        controlFoldingReshapes(std::move(foldReshapes)) {}
+
+  LogicalResult matchAndRewrite(tensor::ExpandShapeOp expandOp,
+                                PatternRewriter &rewriter) const override {
+    tensor::PadOp padOp = expandOp.getSrc().getDefiningOp<tensor::PadOp>();
+    if (!padOp)
+      return failure();
+
+    if (!padOp->hasOneUse())
+      return failure();
+
+    if (!controlFoldingReshapes(&expandOp.getSrcMutable())) {
+      return rewriter.notifyMatchFailure(expandOp,
+                                         "fusion blocked by control function");
+    }
+
+    Value constantPaddingValue = padOp.getConstantPaddingValue();
+    if (!constantPaddingValue) {
+      return rewriter.notifyMatchFailure(
+          expandOp, "cannot fold with non-constant padding value");
+    }
+
+    SmallVector<ReassociationIndices> reassociations =
+        expandOp.getReassociationIndices();
+    SmallVector<OpFoldResult> low = padOp.getMixedLowPad();
+    SmallVector<OpFoldResult> high = padOp.getMixedHighPad();
+
+    for (auto [reInd, l, h] : llvm::zip_equal(reassociations, low, high)) {
+      if (reInd.size() > 1 &&
+          (!isConstantIntValue(l, 0) || !isConstantIntValue(h, 0)))
+        return rewriter.notifyMatchFailure(
+            expandOp, "fusion blocked by non-zero padding");
+    }
+
+    SmallVector<OpFoldResult> newLow, newHigh;
+    for (auto [idx, reInd] : llvm::enumerate(reassociations)) {
+      newLow.append(reInd.size(), low[idx]);
+      newHigh.append(reInd.size(), high[idx]);
+    }
----------------
Max191 wrote:

nit: combine these 2 loops.

https://github.com/llvm/llvm-project/pull/136681