Enable bundling of dynamic memory pools on a block basis. (#330)

* Reorganize main function.

* Follow review comments.

* Emit constants are globals in Krnl and LLVM dialects.

* Fix dynamic bundling.

* Format.

* Fix test.

src/Transform/BundleMemoryPools.cpp

@@ -26,23 +26,12 @@ using namespace mlir;
 namespace {
 
 //===----------------------------------------------------------------------===//
-// Insertion point for initialization instructions and the blocks used for
+// Data structures for managing memory pools.
-// inserting the initialization and main code. These blocks will disappear
-// when the first canonicalization is performed because the init block
-// unconditionally branches into the second block. These blocks exist only for
-// the purpose of this optimization.
-// The information is recorded on a per function basis.
 //===----------------------------------------------------------------------===//
 
-typedef struct ONNXOperandsInitState {
+// Data structure for managing dyanmic memory pool.
-  Block *initBlock;
+typedef std::map<Block *, AllocOp> BlockToDynamicPool;
-  Block *mainBlock;
+std::map<FuncOp, std::unique_ptr<BlockToDynamicPool>> dynamicPoolMap;
-  BranchOp branchInit;
-  AllocOp dynamicMemoryPool;
-} ONNXOperandsInitState;
-
-// Helper data structure for the bundling of dynamic AllocOps.
-std::map<FuncOp, std::unique_ptr<ONNXOperandsInitState>> initMap;
 
 // Handling of static memory pool on a block-basis in each function.
 typedef std::map<Block *, AllocOp> BlockToStaticPool;
@@ -63,65 +52,24 @@ FuncOp getContainingFunction(AllocOp op) {
   return cast<FuncOp>(parentFuncOp);
 }
 
-bool hasInitBlock(FuncOp function) {
+// Check if this value is an argument of one of the blocks nested
-  std::unique_ptr<ONNXOperandsInitState> &initState = initMap.at(function);
+// around it.
-  return initState->initBlock != nullptr;
+bool isBlockArgument(AllocOp allocOp, Value operand) {
-}
+  // Parent operation of the current block.
+  Operation *parentBlockOp;
+  Block *currentBlock = allocOp.getOperation()->getBlock();
 
-bool addInitBlock(PatternRewriter &rewriter, Location loc, AllocOp allocOp) {
+  do {
-  // If this is the first time we encounter an operation in this
+    // Check the arguments of the current block.
-  // function, we create an entry inside the initMap and split the
+    for (auto arg : currentBlock->getArguments())
-  // function body into an init block and a main block.
-  //
-  // function func_name() {
-  //    ... init block ...
-  //    br ^bb1
-  //  ^bb1:  // pred: ^bb0
-  //    ... main block ...
-  //    return
-  // }
-  //
-  // Note: the block ^bb0 being the first block has its label omitted.
-  //
-  FuncOp function = getContainingFunction(allocOp);
-  // If the function does not contain an init block, create one.
-  if (!hasInitBlock(function)) {
-    std::unique_ptr<ONNXOperandsInitState> &initState = initMap.at(function);
-    initState = std::make_unique<ONNXOperandsInitState>();
-
-    // All input arguments are considered as part of the initialization block
-    // so add them to the operandsInInitBlock set.
-    Block *functionBlock = &function.front();
-    PatternRewriter::InsertionGuard insertGuard(rewriter);
-    rewriter.setInsertionPointToStart(functionBlock);
-
-    initState->initBlock = rewriter.getInsertionBlock();
-    auto currentPoint = rewriter.getInsertionPoint();
-    initState->mainBlock =
-        rewriter.splitBlock(initState->initBlock, currentPoint);
-
-    rewriter.setInsertionPointToEnd(initState->initBlock);
-
-    // Insert a branch operation from initBlock to mainBlock. This
-    // ensures the final code contains legal blocks.
-    initState->branchInit =
-        rewriter.create<BranchOp>(loc, initState->mainBlock);
-
-    rewriter.setInsertionPointToStart(initState->mainBlock);
-
-    // Save a reference to the current dynamic memory pool value.
-    initState->dynamicMemoryPool = allocOp;
-
-    return true;
-  }
-
-  return false;
-}
-
-bool isBlockArgument(Block *block, Value operand) {
-  for (auto arg : block->getArguments())
       if (operand == arg)
         return true;
+
+    parentBlockOp = currentBlock->getParentOp();
+    currentBlock = parentBlockOp->getBlock();
+
+  } while (!llvm::dyn_cast_or_null<FuncOp>(parentBlockOp));
+
   return false;
 }
 
@@ -332,14 +280,17 @@ public:
 
     // Get function.
     FuncOp function = getContainingFunction(allocOp);
-    Block *firstBlock = &function.getBody().front();
 
-    // If this is the alloc representing the memory pool and the function
+    // Use function to retrieve the list of blocks for this function.
-    // already has an init block, pattern matching must fail to avoid
+    std::unique_ptr<BlockToDynamicPool> &blockToDynamicPool =
-    // processing the dynamic memory pool a second time.
+        dynamicPoolMap.at(function);
-    if (hasInitBlock(function)) {
+
-      std::unique_ptr<ONNXOperandsInitState> &initState = initMap.at(function);
+    // If this is not the first time we process an alloc in this block, avoid
-      if (allocOp == initState->dynamicMemoryPool)
+    // processing the current dynamic memory pool again.
+    if (blockToDynamicPool->count(parentBlock) > 0) {
+      std::unique_ptr<BlockToDynamicPool> &blockToDynamicPool =
+          dynamicPoolMap.at(function);
+      if (allocOp == blockToDynamicPool->at(parentBlock))
         return failure();
     }
 
@@ -365,11 +316,10 @@ public:
         dependentOps.insert(definingOperation);
 
         // Add operands to work queue.
-        // printf("Processing the args of the following op:\n");
         for (const auto &operand : definingOperation->getOperands()) {
           // Check operand is not a block argument. If it is skip it, we
           // consider block arguments to be leafs.
-          if (!isBlockArgument(firstBlock, operand)) {
+          if (!isBlockArgument(allocOp, operand)) {
             operandList.emplace_back(operand);
 
             // Check if the current operation is a dim or a load and the
@@ -416,15 +366,23 @@ public:
       if (dependentOps.count(&op) > 0)
         orderedDependentOps.emplace_back(&op);
 
-    // If no dynamic alloc is in the trace of the dependent operations,
+    // If this is the first valid alloc we can bundle in this block, then we
-    // emit the size calculation in the init block, if one exists already,
+    // need to move it to the top of the block as it will consitute an
-    // if not, create the init block.
+    // insertion point for all other bundle-able AllocOps in the block.
-    bool addedInitBlock = addInitBlock(rewriter, loc, allocOp);
+    bool isFirstBundledAllocOp = blockToDynamicPool->count(parentBlock) == 0;
+    if (isFirstBundledAllocOp) {
+      allocOp.getOperation()->moveBefore(&parentBlock->front());
 
-    // Move the ordered dependent size calculation to the init block.
+      // Create new entry in the block map.
-    std::unique_ptr<ONNXOperandsInitState> &initState = initMap.at(function);
+      blockToDynamicPool->insert(
+          std::pair<Block *, AllocOp>(parentBlock, allocOp));
+    }
+
+    // Move the computation instructions at the start of the block.
+    AllocOp oldDynamicMemoryPool = blockToDynamicPool->at(parentBlock);
+    std::reverse(orderedDependentOps.begin(), orderedDependentOps.end());
     for (auto &op : orderedDependentOps)
-      op->moveBefore(initState->branchInit);
+      op->moveBefore(&parentBlock->front());
 
     // Bundle MemRef type: <?xi8>
     SmallVector<int64_t, 1> memPoolShape;
@@ -438,16 +396,16 @@ public:
       return failure();
 
     // Add the current alloc size to the current MemPool size.
-    Value dynamicMemoryPoolSize = initState->dynamicMemoryPool.getOperand(0);
+    Value dynamicMemoryPoolSize = oldDynamicMemoryPool.getOperand(0);
-    if (addedInitBlock) {
+    if (isFirstBundledAllocOp) {
       Value zero = emitConstantOp(rewriter, loc, rewriter.getIndexType(), 0);
-      zero.getDefiningOp()->moveBefore(initState->branchInit);
+      zero.getDefiningOp()->moveBefore(oldDynamicMemoryPool);
       dynamicMemoryPoolSize = zero;
     }
 
     AddIOp bundledAllocOperand = rewriter.create<AddIOp>(
         loc, dynamicMemoryPoolSize, allocOp.getOperand(0));
-    bundledAllocOperand.getOperation()->moveBefore(initState->branchInit);
+    bundledAllocOperand.getOperation()->moveBefore(oldDynamicMemoryPool);
 
     // The newly bundled MemRef expressed as a KrnlGetRefOp.
     // Current memory pool size is the offset for the newly bundled
@@ -455,26 +413,27 @@ public:
     Value integerDynamicMemoryPoolSize = rewriter.create<IndexCastOp>(
         loc, dynamicMemoryPoolSize, rewriter.getIntegerType(64));
     integerDynamicMemoryPoolSize.getDefiningOp()->moveBefore(
-        initState->branchInit);
+        oldDynamicMemoryPool);
 
     // We need to emit a new alloc which contains the additional MemRef.
     AllocOp bundledAlloc = rewriter.create<AllocOp>(
         loc, bundledMemPoolMemRefType, bundledAllocOperand.getResult());
-    bundledAlloc.getOperation()->moveBefore(&initState->mainBlock->front());
+    bundledAlloc.getOperation()->moveBefore(oldDynamicMemoryPool);
 
     KrnlGetRefOp bundledMemRef = rewriter.create<KrnlGetRefOp>(loc,
         currentAllocGetRef.getResult().getType(), bundledAlloc,
         integerDynamicMemoryPoolSize);
-    bundledMemRef.getOperation()->moveAfter(bundledAlloc);
 
     // Replace old memory pool with new one.
-    rewriter.replaceOp(initState->dynamicMemoryPool, bundledAlloc.getResult());
+    rewriter.replaceOp(oldDynamicMemoryPool, bundledAlloc.getResult());
 
     // Replace old getref with new getref from new memory pool.
     rewriter.replaceOp(currentAllocGetRef, bundledMemRef.getResult());
 
-    // Update MemPool size.
+    // Update MemPool data structure.
-    initState->dynamicMemoryPool = bundledAlloc;
+    blockToDynamicPool->erase(parentBlock);
+    blockToDynamicPool->insert(
+        std::pair<Block *, AllocOp>(parentBlock, bundledAlloc));
 
     return success();
   }
@@ -488,16 +447,14 @@ class KrnlBundleMemoryPoolsPass
 public:
   void runOnFunction() override {
     auto function = getFunction();
-    initMap.insert(std::pair<FuncOp, std::unique_ptr<ONNXOperandsInitState>>(
+
-        function, std::make_unique<ONNXOperandsInitState>()));
+    dynamicPoolMap.insert(
+        std::pair<FuncOp, std::unique_ptr<BlockToDynamicPool>>(
+            function, std::make_unique<BlockToDynamicPool>()));
 
     staticPoolMap.insert(std::pair<FuncOp, std::unique_ptr<BlockToStaticPool>>(
         function, std::make_unique<BlockToStaticPool>()));
 
-    // Initialize state for this function.
-    std::unique_ptr<ONNXOperandsInitState> &initState = initMap.at(function);
-    initState->initBlock = nullptr;
-
     ConversionTarget target(getContext());
     OwningRewritePatternList patterns;
     patterns.insert<KrnlBundleStaticMemoryPools, KrnlBundleDynamicMemoryPools>(
@@ -505,7 +462,7 @@ public:
 
     applyPatternsAndFoldGreedily(function, patterns);
 
-    initMap.erase(function);
+    dynamicPoolMap.erase(function);
     staticPoolMap.erase(function);
   }
 };

test/mlir/krnl/krnl_bundle_memory_pool.mlir

@@ -1,4 +1,4 @@
-// RUN: onnx-mlir-opt --bundle-memory-pools --canonicalize %s -split-input-file | FileCheck %s
+// RUN: onnx-mlir-opt --bundle-memory-pools --canonicalize %s | FileCheck %s
 
 func @test_pool_bundling(%arg0: memref<10x10xf32>, %arg1: memref<10x20xf32>) -> memref<10x20xf32> {
   %c0_i64 = constant 0 : i64
@@ -88,17 +88,17 @@ func @test_dynamic_pool_bundling(%arg0: memref<?x?xf32>) -> memref<?x10xf32> {
   // CHECK: [[C10:%.+]] = constant 10 : index
   // CHECK: [[C0_I64:%.+]] = constant 0 : i64
   // CHECK: [[DIM:%.+]] = dim %arg0, [[C0]] : memref<?x?xf32>
+  // CHECK: [[MUL2:%.+]] = muli [[DIM]], [[C4]] : index
+  // CHECK: [[OFFSET2:%.+]] = muli [[MUL2]], [[C10]] : index
   // CHECK: [[SGT:%.+]] = cmpi "sgt", [[DIM]], [[DIM]] : index
   // CHECK: [[SELECT:%.+]] = select [[SGT]], [[DIM]], [[DIM]] : index
   // CHECK: [[MUL1:%.+]] = muli [[SELECT]], [[C4]] : index
   // CHECK: [[OFFSET1:%.+]] = muli [[MUL1]], [[C10]] : index
-  // CHECK: [[MUL2:%.+]] = muli [[DIM]], [[C4]] : index
-  // CHECK: [[OFFSET2:%.+]] = muli [[MUL2]], [[C10]] : index
   // CHECK: [[MEMPOOL_SIZE:%.+]] = addi [[OFFSET1]], [[OFFSET2]] : index
   // CHECK: [[OFFSET1_I64:%.+]] = index_cast [[OFFSET1]] : index to i64
   // CHECK: [[DYN_MEMPOOL:%.+]] = alloc([[MEMPOOL_SIZE]]) : memref<?xi8>
-  // CHECK: [[DATA1:%.+]] = "krnl.getref"([[DYN_MEMPOOL]], [[OFFSET1_I64]]) : (memref<?xi8>, i64) -> memref<?x10xf32>
   // CHECK: [[DATA2:%.+]] = "krnl.getref"([[DYN_MEMPOOL]], [[C0_I64]]) : (memref<?xi8>, i64) -> memref<?x10xf32>
+  // CHECK: [[DATA1:%.+]] = "krnl.getref"([[DYN_MEMPOOL]], [[OFFSET1_I64]]) : (memref<?xi8>, i64) -> memref<?x10xf32>
   // CHECK: [[RES:%.+]] = alloc([[DIM]]) : memref<?x10xf32>
   // CHECK: affine.store [[CST]], [[DATA1]][0, 0] : memref<?x10xf32>
   // CHECK: affine.store [[CST]], [[DATA2]][0, 0] : memref<?x10xf32>
@@ -149,36 +149,36 @@ func @test_dynamic_and_static_pool_bundling(%arg0: memref<?x?xf32>, %arg1: memre
   return %15 : memref<?x10xf32>
 
   // CHECK-LABEL: test_dynamic_and_static_pool_bundling
-  // CHECK: [[C1200_I64:%.+]] = constant 1200 : i64
   // CHECK: [[CST:%.+]] = constant 0.000000e+00 : f32
   // CHECK: [[C0:%.+]] = constant 0 : index
   // CHECK: [[C4:%.+]] = constant 4 : index
   // CHECK: [[C10:%.+]] = constant 10 : index
-  // CHECK: [[C400_I64:%.+]] = constant 400 : i64
+  // CHECK: [[C2000_I64:%.+]] = constant 2000 : i64
+  // CHECK: [[C1600_I64:%.+]] = constant 1600 : i64
   // CHECK: [[C0_I64:%.+]] = constant 0 : i64
   // CHECK: [[DIM:%.+]] = dim %arg0, [[C0]] : memref<?x?xf32>
+  // CHECK: [[MUL2:%.+]] = muli [[DIM]], [[C4]] : index
+  // CHECK: [[OFFSET2:%.+]] = muli [[MUL2]], [[C10]] : index
   // CHECK: [[SGT:%.+]] = cmpi "sgt", [[DIM]], [[DIM]] : index
   // CHECK: [[SELECT:%.+]] = select [[SGT]], [[DIM]], [[DIM]] : index
   // CHECK: [[MUL1:%.+]] = muli [[SELECT]], [[C4]] : index
   // CHECK: [[OFFSET1:%.+]] = muli [[MUL1]], [[C10]] : index
-  // CHECK: [[MUL2:%.+]] = muli [[DIM]], [[C4]] : index
-  // CHECK: [[OFFSET2:%.+]] = muli [[MUL2]], [[C10]] : index
   // CHECK: [[MEMPOOL_SIZE:%.+]] = addi [[OFFSET1]], [[OFFSET2]] : index
   // CHECK: [[OFFSET1_I64:%.+]] = index_cast [[OFFSET1]] : index to i64
   // CHECK: [[DYN_MEMPOOL:%.+]] = alloc([[MEMPOOL_SIZE]]) : memref<?xi8>
-  // CHECK: [[DATA1:%.+]] = "krnl.getref"([[DYN_MEMPOOL]], [[OFFSET1_I64]]) : (memref<?xi8>, i64) -> memref<?x10xf32>
   // CHECK: [[DATA2:%.+]] = "krnl.getref"([[DYN_MEMPOOL]], [[C0_I64]]) : (memref<?xi8>, i64) -> memref<?x10xf32>
+  // CHECK: [[DATA1:%.+]] = "krnl.getref"([[DYN_MEMPOOL]], [[OFFSET1_I64]]) : (memref<?xi8>, i64) -> memref<?x10xf32>
   // CHECK: [[STATIC_MEMPOOL:%.+]] = alloc() : memref<2800xi8>
-  // CHECK: [[DATA3:%.+]] = "krnl.getref"([[STATIC_MEMPOOL]], [[C1200_I64]]) : (memref<2800xi8>, i64) -> memref<10x40xf32>
+  // CHECK: [[DATA3:%.+]] = "krnl.getref"([[STATIC_MEMPOOL]], [[C2000_I64]]) : (memref<2800xi8>, i64) -> memref<10x20xf32>
-  // CHECK: [[DATA4:%.+]] = "krnl.getref"([[STATIC_MEMPOOL]], [[C400_I64]]) : (memref<2800xi8>, i64) -> memref<10x20xf32>
+  // CHECK: [[DATA4:%.+]] = "krnl.getref"([[STATIC_MEMPOOL]], [[C1600_I64]]) : (memref<2800xi8>, i64) -> memref<10x10xf32>
-  // CHECK: [[DATA5:%.+]] = "krnl.getref"([[STATIC_MEMPOOL]], [[C0_I64]]) : (memref<2800xi8>, i64) -> memref<10x10xf32>
   // CHECK: [[RES:%.+]] = alloc([[DIM]]) : memref<?x10xf32>
+  // CHECK: [[DATA5:%.+]] = "krnl.getref"([[STATIC_MEMPOOL]], [[C0_I64]]) : (memref<2800xi8>, i64) -> memref<10x40xf32>
   // CHECK: affine.store [[CST]], [[DATA1]][0, 0] : memref<?x10xf32>
   // CHECK: affine.store [[CST]], [[DATA2]][0, 0] : memref<?x10xf32>
   // CHECK: affine.store [[CST]], [[RES]][0, 0] : memref<?x10xf32>
-  // CHECK: affine.store [[CST]], [[DATA5]][0, 0] : memref<10x10xf32>
+  // CHECK: affine.store [[CST]], [[DATA4]][0, 0] : memref<10x10xf32>
-  // CHECK: affine.store [[CST]], [[DATA4]][0, 0] : memref<10x20xf32>
+  // CHECK: affine.store [[CST]], [[DATA3]][0, 0] : memref<10x20xf32>
-  // CHECK: affine.store [[CST]], [[DATA3]][0, 0] : memref<10x40xf32>
+  // CHECK: affine.store [[CST]], [[DATA5]][0, 0] : memref<10x40xf32>
   // CHECK: dealloc [[DYN_MEMPOOL]] : memref<?xi8>
   // CHECK: dealloc [[STATIC_MEMPOOL]] : memref<2800xi8>
   // CHECK: return [[RES]] : memref<?x10xf32>
@@ -365,3 +365,97 @@ func @static_mem_pool_rnn_sub_and_main_block(%arg0: memref<1x3x2xf32>, %arg1: me
   // CHECK: dealloc [[STATIC_MEM_POOL_MAIN]] : memref<12xi8>
   // CHECK: return [[RES]] : memref<1x3x4xf32>
 }
+
+/// Test dynamic pooling in sub-block.
+func @test_dynamic_pool_rnn(%arg0: memref<1x3x2xf32>, %arg1: memref<1x4x2xf32>, %arg2: memref<1x?x?xf32>) -> memref<1x3x?xf32> attributes {input_names = ["X", "W", "R"], output_names = ["Y"]} {
+  %cst = constant 0.000000e+00 : f32
+  %c0_i64 = constant 0 : i64
+  %c_ind = constant 1 : index
+  %dim0 = dim %arg1, %c_ind : memref<1x4x2xf32>
+  %0 = alloc(%dim0) : memref<1x3x?xf32>
+  %1:3 = krnl.define_loops 3
+  krnl.iterate(%1#0, %1#1, %1#2) with (%1#0 -> %arg3 = 0 to 1, %1#1 -> %arg4 = 0 to 3, %1#2 -> %arg5 = 0 to 4) {
+    affine.store %cst, %0[symbol(%arg3), symbol(%arg4), symbol(%arg5)] : memref<1x3x?xf32>
+  }
+  %2 = krnl.define_loops 1
+  krnl.iterate(%2) with (%2 -> %arg3 = 0 to 1) {
+    %3:2 = krnl.define_loops 2
+    krnl.iterate(%3#0, %3#1) with (%3#0 -> %arg4 = 0 to 3, %3#1 -> %arg5 = 0 to 4) {
+      %dim1 = dim %arg2, %c_ind : memref<1x?x?xf32>
+      %4 = alloc(%dim1) : memref<?xi8>
+      %5 = "krnl.getref"(%4, %c0_i64) : (memref<?xi8>, i64) -> memref<f32>
+      %6 = affine.load %0[0, symbol(%arg4), symbol(%arg5)] : memref<1x3x?xf32>
+      %7 = alloc(%dim1) : memref<?xi8>
+      %8 = "krnl.getref"(%7, %c0_i64) : (memref<?xi8>, i64) -> memref<f32>
+      affine.store %cst, %8[] : memref<f32>
+      %c_ind_2 = constant 2 : index
+      %dim2 = dim %arg2, %c_ind_2 : memref<1x?x?xf32>
+      %9 = alloc(%dim2) : memref<?xi8>
+      %10 = "krnl.getref"(%9, %c0_i64) : (memref<?xi8>, i64) -> memref<f32>
+      affine.store %cst, %10[] : memref<f32>
+      %11 = krnl.define_loops 1
+      krnl.iterate(%11) with (%11 -> %arg6 = 0 to 2) {
+        %25 = affine.load %arg0[symbol(%arg3), symbol(%arg4), symbol(%arg6)] : memref<1x3x2xf32>
+        %26 = affine.load %arg1[0, symbol(%arg5), symbol(%arg6)] : memref<1x4x2xf32>
+        %27 = mulf %25, %26 : f32
+        %28 = affine.load %8[] : memref<f32>
+        %29 = addf %28, %27 : f32
+        affine.store %29, %8[] : memref<f32>
+        %30 = affine.load %arg2[0, symbol(%arg5), symbol(%arg6)] : memref<1x?x?xf32>
+        %31 = mulf %6, %30 : f32
+        %32 = affine.load %10[] : memref<f32>
+        %33 = addf %32, %31 : f32
+        affine.store %33, %10[] : memref<f32>
+      }
+      %12 = affine.load %8[] : memref<f32>
+      %13 = affine.load %10[] : memref<f32>
+      %14 = addf %12, %13 : f32
+      %15 = alloc(%dim2) : memref<?xi8>
+      %16 = "krnl.getref"(%15, %c0_i64) : (memref<?xi8>, i64) -> memref<f32>
+      affine.store %14, %16[] : memref<f32>
+      %17 = affine.load %16[] : memref<f32>
+      %18 = subf %cst, %17 : f32
+      %19 = exp %17 : f32
+      %20 = exp %18 : f32
+      %21 = subf %19, %20 : f32
+      %22 = addf %19, %20 : f32
+      %23 = divf %21, %22 : f32
+      affine.store %23, %5[] : memref<f32>
+      %24 = affine.load %5[] : memref<f32>
+      affine.store %24, %0[0, symbol(%arg4), symbol(%arg5)] : memref<1x3x?xf32>
+      dealloc %15 : memref<?xi8>
+      dealloc %9 : memref<?xi8>
+      dealloc %7 : memref<?xi8>
+      dealloc %4 : memref<?xi8>
+    }
+  }
+  return %0 : memref<1x3x?xf32>
+
+  // CHECK-LABEL: test_dynamic_pool_rnn
+  // CHECK: [[C1:%.+]] = constant 1 : index
+  // CHECK: [[C2:%.+]] = constant 2 : index
+  // CHECK: [[C0:%.+]] = constant 0 : i64
+  // CHECK: krnl.define_loops 1
+  // CHECK: krnl.iterate
+  // CHECK: krnl.define_loops 2
+  // CHECK: krnl.iterate
+  // CHECK: [[DIM1:%.+]] = dim %arg2, [[C1]] : memref<1x?x?xf32>
+  // CHECK: [[DIM2:%.+]] = dim %arg2, [[C2]] : memref<1x?x?xf32>
+  // CHECK: [[ADD1:%.+]] = addi [[DIM2]], [[DIM2]] : index
+  // CHECK: [[OFFSET1:%.+]] = index_cast [[DIM2]] : index to i64
+  // CHECK: [[ADD2:%.+]] = addi [[ADD1]], [[DIM1]] : index
+  // CHECK: [[OFFSET2:%.+]] = index_cast [[ADD1]] : index to i64
+  // CHECK: [[ADD3:%.+]] = addi [[ADD2]], [[DIM1]] : index
+  // CHECK: [[OFFSET3:%.+]] = index_cast [[ADD2]] : index to i64
+  // CHECK: [[DYNAMIC_MEMORY_POOL:%.+]] = alloc([[ADD3]]) : memref<?xi8>
+  // CHECK: [[DATA1:%.+]] = "krnl.getref"([[DYNAMIC_MEMORY_POOL]], [[C0]]) : (memref<?xi8>, i64) -> memref<f32>
+  // CHECK: [[DATA2:%.+]] = "krnl.getref"([[DYNAMIC_MEMORY_POOL]], [[OFFSET3]]) : (memref<?xi8>, i64) -> memref<f32>
+  // CHECK: affine.load
+  // CHECK: [[DATA3:%.+]] = "krnl.getref"([[DYNAMIC_MEMORY_POOL]], [[OFFSET2]]) : (memref<?xi8>, i64) -> memref<f32>
+  // CHECK: affine.store
+  // CHECK: [[DATA4:%.+]] = "krnl.getref"([[DYNAMIC_MEMORY_POOL]], [[OFFSET1]]) : (memref<?xi8>, i64) -> memref<f32>
+  // CHECK: affine.store
+  // CHECK: krnl.define_loops
+  // CHECK: krnl.iterate
+  // CHECK: dealloc [[DYNAMIC_MEMORY_POOL]] : memref<?xi8>
+}