[mlir][linalg][bufferize] Generalize destination-passing style detection

[springerm]

Summary

If not allow-return-memref, raise an error if a new memory allocation is returned/yielded from a block. We do not check for new allocations directly, but for ops that yield/return values that are not equivalent to values that are defined outside of the current of the block.

Note: We still need to check that scf.for yield values and bbArgs are aliasing to ensure that getAliasingOpOperand/getAliasingOpResult is correct.

Depends On D117424

[springerm]

update

[nicolasvasilache]

This is also related to D115706 (cc @silvas).

mlir/lib/Dialect/Linalg/ComprehensiveBufferize/ComprehensiveBufferize.cpp

582

Add a TODO to reflect D115706 ?

587

This seems like it is uninitialized, which makes me think you are missing info given the signature:

static bool happensBefore(Operation *a, Operation *b, const DominanceInfo &domInfo);

OTOH digging deeper there is a mutable keyword there ..

611

Is this path tested ?
I don't see a new test that seems to cover this.
Maybe it is already tested previously?

This seems fishy given the DominanceInfo caching / mutable behavior, I'd double check to be sure.

[springerm]

update

[springerm]

address comments

[springerm]

mlir/lib/Dialect/Linalg/ComprehensiveBufferize/ComprehensiveBufferize.cpp

582

forgot what to do here...

587

initializing it with op now just to be sure

611

Added 2 new test cases. The ones that uses scf.execute_region.

[springerm]

rebase

[nicolasvasilache]

mlir/test/Dialect/Linalg/comprehensive-module-bufferize.mlir

1

Can we split tests that require the "allow-return-memref" flag from the rest (in a followup)?

4–6

same here

mlir/include/mlir/Dialect/Linalg/ComprehensiveBufferize/SCFInterfaceImpl.h

 namespace mlir {
 
 class DialectRegistry;
 
 namespace linalg {
 namespace comprehensive_bufferize {
 namespace scf_ext {
 
-/// Equivalence analysis for scf.for. Raise an error if iter_args are not
-/// equivalent to their corresponding loop yield values.
-struct AssertDestinationPassingStyle : public PostAnalysisStep {
+/// Assert that yielded values of an scf.for op are aliasing their corresponding
+/// bbArgs. This is required because the i-th OpResult of an scf.for op is
+/// currently assumed to alias with the i-th iter_arg (in the absence of
+/// conflicts).
+struct AssertScfForAliasingProperties : public PostAnalysisStep {
   LogicalResult run(Operation *op, BufferizationState &state,
                     BufferizationAliasInfo &aliasInfo,
                     SmallVector<Operation *> &newOps) override;
 };
 
 void registerBufferizableOpInterfaceExternalModels(DialectRegistry &registry);
 
 } // namespace scf_ext
 } // namespace comprehensive_bufferize
 } // namespace linalg
 } // namespace mlir
 
 #endif // MLIR_DIALECT_LINALG_COMPREHENSIVEBUFFERIZE_SCF_INTERFACE_IMPL_H

mlir/lib/Dialect/Linalg/ComprehensiveBufferize/ComprehensiveBufferize.cpp

 
 #include "mlir/Dialect/Bufferization/IR/Bufferization.h"
 #include "mlir/Dialect/Linalg/ComprehensiveBufferize/BufferizableOpInterface.h"
 #include "mlir/Dialect/MemRef/IR/MemRef.h"
 #include "mlir/IR/AsmState.h"
 #include "mlir/IR/Dominance.h"
 #include "mlir/IR/Operation.h"
 #include "mlir/IR/TypeUtilities.h"
+#include "mlir/Interfaces/ControlFlowInterfaces.h"
 #include "mlir/Transforms/GreedyPatternRewriteDriver.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/SetVector.h"
 
 using namespace mlir;
 using namespace linalg;
 using namespace tensor;
 using namespace comprehensive_bufferize;
annotateOpsWithBufferizationMarkers(Operation *op,
   op->walk([&](Operation *op) {
     if (auto bufferizableOp = state.getOptions().dynCastBufferizableOp(op))
       for (OpOperand &opOperand : op->getOpOperands())
         if (opOperand.get().getType().isa<TensorType>())
           setInPlaceOpOperand(opOperand, aliasInfo.isInPlace(opOperand));
   });
 }
 
+/// Assert that IR is in destination-passing style. I.e., every value that is
+/// returned or yielded from a block is:
+/// * aliasing a bbArg of that block or a parent block, or
+/// * aliasing an OpResult of a op in a parent block.
+///
+/// Example:
+/// ```
+/// %0 = "some_op" : tensor<?xf32>
+/// %1 = scf.if %c -> (tensor<?xf32>) {
+///   scf.yield %0 : tensor<?xf32>
+/// } else {
+///   %t = linalg.init_tensor : tensor<?xf32>
+///   scf.yield %t : tensor<?xf32>
+/// }
+/// ```
+/// In the above example, the first scf.yield op satifies destination-passing
+/// style because the yielded value %0 is defined in the parent block. The
+/// second scf.yield op does not satisfy destination-passing style because the
+/// yielded value %t is defined in the same block as the scf.yield op.
+// TODO: The current implementation checks for equivalent values instead of
+// aliasing values, which is stricter than needed. We can currently not check
+// for aliasing values because the analysis is a maybe-alias analysis and we
+// need a must-alias analysis here.
+struct AssertDestinationPassingStyle : public PostAnalysisStep {
+  LogicalResult run(Operation *op, BufferizationState &state,
+                    BufferizationAliasInfo &aliasInfo,
+                    SmallVector<Operation *> &newOps) override {
+    LogicalResult status = success();
+    DominanceInfo domInfo;
+    op->walk([&](Operation *returnOp) {
+      if (!isRegionReturnLike(returnOp))
+        return WalkResult::advance();
+
+      for (OpOperand &returnValOperand : returnOp->getOpOperands()) {
+        Value returnVal = returnValOperand.get();
+        // Skip non-tensor values.
+        if (!returnVal.getType().isa<TensorType>())
+          continue;
+
+        bool foundEquivValue = false;
+        aliasInfo.applyOnEquivalenceClass(returnVal, [&](Value equivVal) {
+          if (auto bbArg = equivVal.dyn_cast<BlockArgument>()) {
+            Operation *definingOp = bbArg.getOwner()->getParentOp();
+            if (definingOp->isProperAncestor(returnOp))
+              foundEquivValue = true;
+            return;
+          }
+
+          Operation *definingOp = equivVal.getDefiningOp();
+          if (definingOp->getBlock()->findAncestorOpInBlock(
+                  *returnOp->getParentOp()))
+            // Skip ops that happen after `returnOp` and parent ops.
+            if (happensBefore(definingOp, returnOp, domInfo))
+              foundEquivValue = true;
+        });
+
+        if (!foundEquivValue)
+          status =
+              returnOp->emitError()
+              << "operand #" << returnValOperand.getOperandNumber()
+              << " of ReturnLike op does not satisfy destination passing style";
+      }
+
+      return WalkResult::advance();
+    });
+
+    return status;
+  }
+};
+
 LogicalResult mlir::linalg::comprehensive_bufferize::runComprehensiveBufferize(
     Operation *op, std::unique_ptr<BufferizationOptions> options) {
   BufferizationState state(op, *options);
   return runComprehensiveBufferize(op, *options, state);
 }
 
 /// Rewrite pattern that bufferizes bufferizable ops.
 struct BufferizationPattern
for (const std::unique_ptr<PostAnalysisStep> &step :
     if (failed(step->run(op, state, aliasInfo, newOps)))
       return failure();
     // Analyze ops that were created by the PostAnalysisStep.
     if (failed(inPlaceAnalysis(newOps, aliasInfo, state, domInfo)))
       return failure();
     equivalenceAnalysis(newOps, aliasInfo, state);
   }
 
+  if (!options.allowReturnMemref) {
+    SmallVector<Operation *> newOps;
+    if (failed(
+            AssertDestinationPassingStyle().run(op, state, aliasInfo, newOps)))
+      return failure();
+  }
+
   // Annotate operations if we only want to report the analysis.
   if (options.testAnalysisOnly)
     annotateOpsWithBufferizationMarkers(op, aliasInfo, state);
 
   return success();
 }
 
 LogicalResult mlir::linalg::comprehensive_bufferize::runComprehensiveBufferize(

mlir/lib/Dialect/Linalg/ComprehensiveBufferize/SCFInterfaceImpl.cpp

LogicalResult bufferize(Operation *op, RewriterBase &rewriter,
 
     // Replace loop results.
     replaceOpWithBufferizedValues(rewriter, op, newForOp->getResults());
 
     return success();
   }
 };
 
-// TODO: Evolve toward matching ReturnLike ops. Check for aliasing values that
-// do not bufferize inplace. (Requires a few more changes for ConstantOp,
-// InitTensorOp, CallOp.)
-LogicalResult mlir::linalg::comprehensive_bufferize::scf_ext::
-    AssertDestinationPassingStyle::run(Operation *op, BufferizationState &state,
-                                       BufferizationAliasInfo &aliasInfo,
-                                       SmallVector<Operation *> &newOps) {
+LogicalResult
+mlir::linalg::comprehensive_bufferize::scf_ext::AssertScfForAliasingProperties::
+    run(Operation *op, BufferizationState &state,
+        BufferizationAliasInfo &aliasInfo, SmallVector<Operation *> &newOps) {
   LogicalResult status = success();
-  op->walk([&](scf::YieldOp yieldOp) {
-    if (auto forOp = dyn_cast<scf::ForOp>(yieldOp->getParentOp())) {
-      for (OpOperand &operand : yieldOp->getOpOperands()) {
-        auto tensorType = operand.get().getType().dyn_cast<TensorType>();
-        if (!tensorType)
-          continue;
+
+  op->walk([&](scf::ForOp forOp) {
+    auto yieldOp =
+        cast<scf::YieldOp>(forOp.getLoopBody().front().getTerminator());
 
-        OpOperand &forOperand = forOp.getOpOperandForResult(
-            forOp->getResult(operand.getOperandNumber()));
-        auto bbArg = forOp.getRegionIterArgForOpOperand(forOperand);
-        if (!aliasInfo.areEquivalentBufferizedValues(operand.get(), bbArg)) {
-          // TODO: this could get resolved with copies but it can also turn into
-          // swaps so we need to be careful about order of copies.
-          status =
-              yieldOp->emitError()
-              << "Yield operand #" << operand.getOperandNumber()
-              << " does not bufferize to an equivalent buffer to the matching"
-              << " enclosing scf::for operand";
-          return WalkResult::interrupt();
-        }
-      }
-    }
-
-    if (auto ifOp = dyn_cast<scf::IfOp>(yieldOp->getParentOp())) {
-      // IfOps are in destination passing style if all yielded tensors are
-      // a value or equivalent to a value that is defined outside of the IfOp.
-      for (OpOperand &operand : yieldOp->getOpOperands()) {
-        auto tensorType = operand.get().getType().dyn_cast<TensorType>();
-        if (!tensorType)
-          continue;
-
-        bool foundOutsideEquivalent = false;
-        aliasInfo.applyOnEquivalenceClass(operand.get(), [&](Value value) {
-          Operation *valueOp = value.getDefiningOp();
-          if (value.isa<BlockArgument>())
-            valueOp = value.cast<BlockArgument>().getOwner()->getParentOp();
-
-          bool inThenBlock = ifOp.thenBlock()->findAncestorOpInBlock(*valueOp);
-          bool inElseBlock = ifOp.elseBlock()->findAncestorOpInBlock(*valueOp);
-
-          if (!inThenBlock && !inElseBlock)
-            foundOutsideEquivalent = true;
-        });
-
-        if (!foundOutsideEquivalent) {
-          status = yieldOp->emitError()
-                   << "Yield operand #" << operand.getOperandNumber()
-                   << " does not bufferize to a buffer that is equivalent to a"
-                   << " buffer defined outside of the scf::if op";
-          return WalkResult::interrupt();
-        }
-      }
-    }
-
+      if (!aliasInfo.areAliasingBufferizedValues(operand.get(), bbArg)) {
+            << " does not bufferize to a buffer that is aliasing the matching"
     return WalkResult::advance();
   });
+
   return status;
 }
 
 /// Bufferization of scf.yield. Bufferized as part of their enclosing ops, so
 /// this is for analysis only.
 struct YieldOpInterface
     : public BufferizableOpInterface::ExternalModel<YieldOpInterface,
                                                     scf::YieldOp> {

mlir/lib/Dialect/Linalg/Transforms/ComprehensiveBufferizePass.cpp

void LinalgComprehensiveModuleBufferize::runOnOperation() {
   options->analysisFuzzerSeed = analysisFuzzerSeed;
   options->testAnalysisOnly = testAnalysisOnly;
   options->printConflicts = printConflicts;
 
   // Enable InitTensorOp elimination.
   options->addPostAnalysisStep<
       linalg_ext::InsertSliceAnchoredInitTensorEliminationStep>();
   if (!allowReturnMemref)
-    options->addPostAnalysisStep<scf_ext::AssertDestinationPassingStyle>();
+    options->addPostAnalysisStep<scf_ext::AssertScfForAliasingProperties>();
 
   ModuleOp moduleOp = getOperation();
   applyEnablingTransformations(moduleOp);
 
   if (failed(runComprehensiveBufferize(moduleOp, std::move(options)))) {
     signalPassFailure();
     return;
   }

mlir/test/Dialect/Linalg/comprehensive-module-bufferize-invalid.mlir

 // -----
 
 func @scf_if_not_equivalent(
     %cond: i1, %t1: tensor<?xf32> {linalg.inplaceable = true},
     %idx: index) -> tensor<?xf32> {
   %r = scf.if %cond -> (tensor<?xf32>) {
     scf.yield %t1 : tensor<?xf32>
   } else {
-    // This buffer aliases, but is not equivalent.
+    // This buffer aliases, but it is not equivalent.
     %t2 = tensor.extract_slice %t1 [%idx] [%idx] [1] : tensor<?xf32> to tensor<?xf32>
-    // expected-error @+1 {{Yield operand #0 does not bufferize to a buffer that is equivalent to a buffer defined outside of the scf::if op}}
+    // expected-error @+1 {{operand #0 of ReturnLike op does not satisfy destination passing style}}
     scf.yield %t2 : tensor<?xf32>
   }
+  // expected-error @+1 {{operand #0 of ReturnLike op does not satisfy destination passing style}}
   return %r : tensor<?xf32>
 }
 
 // -----
 
+func @scf_if_not_aliasing(
+    %cond: i1, %t1: tensor<?xf32> {linalg.inplaceable = true},
+    %idx: index) -> f32 {
+  %r = scf.if %cond -> (tensor<?xf32>) {
+    scf.yield %t1 : tensor<?xf32>
+  } else {
+    // This buffer aliases.
+    %t2 = linalg.init_tensor [%idx] : tensor<?xf32>
+    // expected-error @+1 {{operand #0 of ReturnLike op does not satisfy destination passing style}}
+    scf.yield %t2 : tensor<?xf32>
+  }
+  %f = tensor.extract %r[%idx] : tensor<?xf32>
+  return %f : f32
+}
+
+// -----
+
 // expected-error @-3 {{expected callgraph to be free of circular dependencies}}
 
 func @foo() {
   call @bar() : () -> ()
   return
 }
 
 func @bar() {
%r0:2 = scf.for %i = %lb to %ub step %step iter_args(%tA = %A, %tB = %B)
       -> (tensor<?xf32>, tensor<?xf32>)
   {
     %ttA = tensor.insert_slice %C into %tA[0][4][1] : tensor<4xf32> into tensor<?xf32>
     %ttB = tensor.insert_slice %C into %tB[0][4][1] : tensor<4xf32> into tensor<?xf32>
 
     // Throw a wrench in the system by swapping yielded values: this result in a
     // ping-pong of values at each iteration on which we currently want to fail.
 
-    // expected-error @+1 {{Yield operand #0 does not bufferize to an equivalent buffer}}
+    // expected-error @+1 {{Yield operand #0 does not bufferize to a buffer that is aliasing}}
     scf.yield %ttB, %ttA : tensor<?xf32>, tensor<?xf32>
   }
 
   return %r0#0, %r0#1: tensor<?xf32>, tensor<?xf32>
 }
 
 // -----
 
 func private @fun_with_side_effects(%A: tensor<?xf32> {linalg.inplaceable = true})
 
 func @foo(%A: tensor<?xf32> {linalg.inplaceable = true}) -> (tensor<?xf32>) {
   call @fun_with_side_effects(%A) : (tensor<?xf32>) -> ()
   return %A: tensor<?xf32>
 }
 
 func @scf_yield_needs_copy(%A : tensor<?xf32> {linalg.inplaceable = true}, %iters : index) {
   %c0 = arith.constant 0 : index
   %c1 = arith.constant 1 : index
   %res = scf.for %arg0 = %c0 to %iters step %c1 iter_args(%bbarg = %A) -> (tensor<?xf32>) {
     %r = call @foo(%A) : (tensor<?xf32>) -> (tensor<?xf32>)
-    // expected-error @+1 {{Yield operand #0 does not bufferize to an equivalent buffer}}
+    // expected-error @+1 {{Yield operand #0 does not bufferize to a buffer that is aliasing}}
     scf.yield %r : tensor<?xf32>
   }
   call @fun_with_side_effects(%res) : (tensor<?xf32>) -> ()
   return
 }
 
 // -----
 
-// expected-error @+1 {{memref return type is unsupported}}
 func @extract_slice_fun(%A : tensor<?xf32> {linalg.inplaceable = true})
   ->  tensor<4xf32>
 {
   // This bufferizes to a pattern that the cross-function boundary pass needs to
   // convert into a new memref argument at all call site; this may be either:
   //   - an externally created aliasing subview (if we want to allow aliasing
   //     function arguments).
   //   - a new alloc + copy (more expensive but does not create new function
   //     argument aliasing).
   %r0 = tensor.extract_slice %A[0][4][1] : tensor<?xf32> to tensor<4xf32>
 
+  // expected-error @+1 {{operand #0 of ReturnLike op does not satisfy destination passing style}}
   return %r0: tensor<4xf32>
 }
 
 // -----
 
-// expected-error @+1 {{memref return type is unsupported}}
 func @scf_yield(%b : i1, %A : tensor<4xf32>, %B : tensor<4xf32>) -> tensor<4xf32>
 {
   %r = scf.if %b -> (tensor<4xf32>) {
     scf.yield %A : tensor<4xf32>
   } else {
     scf.yield %B : tensor<4xf32>
   }
+  // expected-error @+1 {{operand #0 of ReturnLike op does not satisfy destination passing style}}
   return %r: tensor<4xf32>
 }
 
 // -----
 
 func @unknown_op(%A : tensor<4xf32>) -> tensor<4xf32>
 {
-  // expected-error @+1 {{op was not bufferized}}
+  // expected-error: @+1 {{op was not bufferized}}
   %r = "marklar"(%A) : (tensor<4xf32>) -> (tensor<4xf32>)
+  // expected-error @+1 {{operand #0 of ReturnLike op does not satisfy destination passing style}}
   return %r: tensor<4xf32>
 }
 
 // -----
 
-// expected-error @+1 {{memref return type is unsupported}}
 func @mini_test_case1() -> tensor<10x20xf32> {
   %f0 = arith.constant 0.0 : f32
   %t = linalg.init_tensor [10, 20] : tensor<10x20xf32>
   %r = linalg.fill(%f0, %t) : f32, tensor<10x20xf32> -> tensor<10x20xf32>
+  // expected-error @+1 {{operand #0 of ReturnLike op does not satisfy destination passing style}}
   return %r : tensor<10x20xf32>
 }
 
 // -----
 
 func @main() -> tensor<4xi32> {
-  // expected-error @+1 {{scf.execute_region with tensor result not supported}}
   %r = scf.execute_region -> tensor<4xi32> {
     %A = arith.constant dense<[1, 2, 3, 4]> : tensor<4xi32>
     scf.yield %A: tensor<4xi32>
   }
+  // Note: If allow-return-memref, this test case would still fail with:
+  // "scf.execute_region with tensor result not supported"
+  // expected-error @+1 {{operand #0 of ReturnLike op does not satisfy destination passing style}}
   return %r: tensor<4xi32>
 }
 
 // -----
 
 func @to_memref_op_is_writing(
     %t1: tensor<?xf32> {linalg.inplaceable = true}, %idx1: index,
     %idx2: index, %idx3: index, %v1: vector<5xf32>) -> (vector<5xf32>, vector<5xf32>) {
func @call_to_unknown_tensor_returning_func(%t : tensor<?xf32>) {
   call @foo(%t) : (tensor<?xf32>) -> (f32, tensor<?xf32>, f32)
   return
 }
 
 // -----
 
 func @foo(%t : tensor<5xf32>) -> (tensor<5xf32>) {
   %0 = linalg.init_tensor [5] : tensor<5xf32>
+  // expected-error @+1 {{operand #0 of ReturnLike op does not satisfy destination passing style}}
   return %0 : tensor<5xf32>
 }
 
+// Note: This function is not analyzed because there was an error in the
+// previous one.
 func @call_to_func_returning_non_equiv_tensor(%t : tensor<5xf32>) {
-  // expected-error @+2 {{call to FuncOp that returns non-equivalent tensors not supported}}
-  // expected-error @+1 {{op was not bufferized}}
   call @foo(%t) : (tensor<5xf32>) -> (tensor<5xf32>)
   return
 }

mlir/test/Dialect/Linalg/comprehensive-module-bufferize-partial.mlir

 // RUN: mlir-opt %s -allow-unregistered-dialect -linalg-comprehensive-module-bufferize="allow-return-memref allow-unknown-ops" -split-input-file | FileCheck %s
 
 // Run fuzzer with different seeds.
-// RUN: mlir-opt %s -allow-unregistered-dialect -linalg-comprehensive-module-bufferize="test-analysis-only analysis-fuzzer-seed=23" -split-input-file -o /dev/null
-// RUN: mlir-opt %s -allow-unregistered-dialect -linalg-comprehensive-module-bufferize="test-analysis-only analysis-fuzzer-seed=59" -split-input-file -o /dev/null
-// RUN: mlir-opt %s -allow-unregistered-dialect -linalg-comprehensive-module-bufferize="test-analysis-only analysis-fuzzer-seed=91" -split-input-file -o /dev/null
+// RUN: mlir-opt %s -allow-unregistered-dialect -linalg-comprehensive-module-bufferize="allow-return-memref test-analysis-only analysis-fuzzer-seed=23" -split-input-file -o /dev/null
+// RUN: mlir-opt %s -allow-unregistered-dialect -linalg-comprehensive-module-bufferize="allow-return-memref test-analysis-only analysis-fuzzer-seed=59" -split-input-file -o /dev/null
+// RUN: mlir-opt %s -allow-unregistered-dialect -linalg-comprehensive-module-bufferize="allow-return-memref test-analysis-only analysis-fuzzer-seed=91" -split-input-file -o /dev/null
 
 // RUN: mlir-opt %s -allow-unregistered-dialect -test-comprehensive-function-bufferize="dialect-filter=tensor allow-unknown-ops allow-return-memref" -canonicalize -split-input-file | FileCheck %s --check-prefix=CHECK-TENSOR
 // RUN: mlir-opt %s -allow-unregistered-dialect -test-comprehensive-function-bufferize="dialect-filter=scf allow-unknown-ops allow-return-memref" -canonicalize -split-input-file | FileCheck %s --check-prefix=CHECK-SCF
 
 // CHECK-LABEL: func @use_of_unknown_op_1(
 //  CHECK-SAME:     %[[m1:.*]]: memref<?xf32
 func @use_of_unknown_op_1(%t1: tensor<?xf32> {linalg.inplaceable = true})
     -> vector<5xf32> {

mlir/test/Dialect/Linalg/comprehensive-module-bufferize.mlir

 // RUN: mlir-opt %s -linalg-comprehensive-module-bufferize=allow-return-memref -split-input-file | FileCheck %s
 
 // Run fuzzer with different seeds.
-// RUN: mlir-opt %s -linalg-comprehensive-module-bufferize="test-analysis-only analysis-fuzzer-seed=23" -split-input-file -o /dev/null
-// RUN: mlir-opt %s -linalg-comprehensive-module-bufferize="test-analysis-only analysis-fuzzer-seed=59" -split-input-file -o /dev/null
-// RUN: mlir-opt %s -linalg-comprehensive-module-bufferize="test-analysis-only analysis-fuzzer-seed=91" -split-input-file -o /dev/null
+// RUN: mlir-opt %s -linalg-comprehensive-module-bufferize="allow-return-memref test-analysis-only analysis-fuzzer-seed=23" -split-input-file -o /dev/null
+// RUN: mlir-opt %s -linalg-comprehensive-module-bufferize="allow-return-memref test-analysis-only analysis-fuzzer-seed=59" -split-input-file -o /dev/null
+// RUN: mlir-opt %s -linalg-comprehensive-module-bufferize="allow-return-memref test-analysis-only analysis-fuzzer-seed=91" -split-input-file -o /dev/null
 
 // CHECK-LABEL: func @transfer_read(%{{.*}}: memref<?xf32, #map>) -> vector<4xf32> {
 func @transfer_read(
     %A : tensor<?xf32> {linalg.inplaceable = false})
   -> (vector<4xf32>)
 {
   %c0 = arith.constant 0 : index
   %f0 = arith.constant 0.0 : f32

mlir/test/lib/Dialect/Linalg/TestComprehensiveBufferize.cpp

 
 void TestComprehensiveFunctionBufferize::runOnFunction() {
   auto options = std::make_unique<BufferizationOptions>();
 
   // Enable InitTensorOp elimination.
   options->addPostAnalysisStep<
       linalg_ext::InsertSliceAnchoredInitTensorEliminationStep>();
   if (!allowReturnMemref)
-    options->addPostAnalysisStep<scf_ext::AssertDestinationPassingStyle>();
+    options->addPostAnalysisStep<scf_ext::AssertScfForAliasingProperties>();
 
   options->allowReturnMemref = allowReturnMemref;
   options->allowUnknownOps = allowUnknownOps;
   options->testAnalysisOnly = testAnalysisOnly;
   options->analysisFuzzerSeed = analysisFuzzerSeed;
 
   if (dialectFilter.hasValue()) {
     options->dialectFilter.emplace();

utils/bazel/llvm-project-overlay/mlir/BUILD.bazel

hdrs = [
         "include/mlir/Dialect/Linalg/ComprehensiveBufferize/BufferizationInterfaceImpl.h",
         "include/mlir/Dialect/Linalg/ComprehensiveBufferize/ComprehensiveBufferize.h",
         "include/mlir/Dialect/Linalg/ComprehensiveBufferize/ModuleBufferization.h",
     ],
     includes = ["include"],
     deps = [
         ":BufferizableOpInterface",
         ":BufferizationDialect",
+        ":ControlFlowInterfaces",
         ":DialectUtils",
         ":IR",
         ":InferTypeOpInterface",
         ":MemRefDialect",
         ":Pass",
         ":StandardOps",
         ":Support",
         ":Transforms",