[Mlir-commits] [mlir] c63125d - [mlir] Fix block merging (#97697)
llvmlistbot at llvm.org
llvmlistbot at llvm.org
Wed Jul 17 09:05:43 PDT 2024
Author: Giuseppe Rossini
Date: 2024-07-17T17:05:40+01:00
New Revision: c63125d4533a22a200c3b5b1efb8ac3ce4b1cb69
URL: https://github.com/llvm/llvm-project/commit/c63125d4533a22a200c3b5b1efb8ac3ce4b1cb69
DIFF: https://github.com/llvm/llvm-project/commit/c63125d4533a22a200c3b5b1efb8ac3ce4b1cb69.diff
LOG: [mlir] Fix block merging (#97697)
With this PR I am trying to address:
https://github.com/llvm/llvm-project/issues/63230.
What changed:
- While merging identical blocks, don't add a block argument if it is
"identical" to another block argument. I.e., if the two block arguments
refer to the same `Value`. The operations operands in the block will
point to the argument we already inserted. This needs to happen to all
the arguments we pass to the different successors of the parent block
- After merged the blocks, get rid of "unnecessary" arguments. I.e., if
all the predecessors pass the same block argument, there is no need to
pass it as an argument.
- This last simplification clashed with
`BufferDeallocationSimplification`. The reason, I think, is that the two
simplifications are clashing. I.e., `BufferDeallocationSimplification`
contains an analysis based on the block structure. If we simplify the
block structure (by merging and/or dropping block arguments) the
analysis is invalid . The solution I found is to do a more prudent
simplification when running that pass.
**Note**: this a rework of #96871 . I ran all the integration tests
(`-DMLIR_INCLUDE_INTEGRATION_TESTS=ON`) and they passed.
Added:
mlir/test/Transforms/test-canonicalize-merge-large-blocks.mlir
Modified:
mlir/lib/Dialect/Bufferization/Transforms/BufferDeallocationSimplification.cpp
mlir/lib/Transforms/Utils/RegionUtils.cpp
mlir/test/Dialect/Bufferization/Transforms/OwnershipBasedBufferDeallocation/dealloc-branchop-interface.mlir
mlir/test/Dialect/Linalg/detensorize_entry_block.mlir
mlir/test/Dialect/Linalg/detensorize_if.mlir
mlir/test/Dialect/Linalg/detensorize_while.mlir
mlir/test/Dialect/Linalg/detensorize_while_impure_cf.mlir
mlir/test/Dialect/Linalg/detensorize_while_pure_cf.mlir
mlir/test/Transforms/canonicalize-block-merge.mlir
mlir/test/Transforms/canonicalize-dce.mlir
mlir/test/Transforms/make-isolated-from-above.mlir
Removed:
################################################################################
diff --git a/mlir/lib/Dialect/Bufferization/Transforms/BufferDeallocationSimplification.cpp b/mlir/lib/Dialect/Bufferization/Transforms/BufferDeallocationSimplification.cpp
index 954485cfede3d..5227b22653eef 100644
--- a/mlir/lib/Dialect/Bufferization/Transforms/BufferDeallocationSimplification.cpp
+++ b/mlir/lib/Dialect/Bufferization/Transforms/BufferDeallocationSimplification.cpp
@@ -463,10 +463,15 @@ struct BufferDeallocationSimplificationPass
SplitDeallocWhenNotAliasingAnyOther,
RetainedMemrefAliasingAlwaysDeallocatedMemref>(&getContext(),
analysis);
+ // We don't want that the block structure changes invalidating the
+ // `BufferOriginAnalysis` so we apply the rewrites witha `Normal` level of
+ // region simplification
+ GreedyRewriteConfig config;
+ config.enableRegionSimplification = GreedySimplifyRegionLevel::Normal;
populateDeallocOpCanonicalizationPatterns(patterns, &getContext());
- if (failed(
- applyPatternsAndFoldGreedily(getOperation(), std::move(patterns))))
+ if (failed(applyPatternsAndFoldGreedily(getOperation(), std::move(patterns),
+ config)))
signalPassFailure();
}
};
diff --git a/mlir/lib/Transforms/Utils/RegionUtils.cpp b/mlir/lib/Transforms/Utils/RegionUtils.cpp
index 4c0f15bafbaba..946d65cef4186 100644
--- a/mlir/lib/Transforms/Utils/RegionUtils.cpp
+++ b/mlir/lib/Transforms/Utils/RegionUtils.cpp
@@ -9,6 +9,7 @@
#include "mlir/Transforms/RegionUtils.h"
#include "mlir/Analysis/TopologicalSortUtils.h"
#include "mlir/IR/Block.h"
+#include "mlir/IR/BuiltinOps.h"
#include "mlir/IR/IRMapping.h"
#include "mlir/IR/Operation.h"
#include "mlir/IR/PatternMatch.h"
@@ -16,11 +17,15 @@
#include "mlir/IR/Value.h"
#include "mlir/Interfaces/ControlFlowInterfaces.h"
#include "mlir/Interfaces/SideEffectInterfaces.h"
+#include "mlir/Support/LogicalResult.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/PostOrderIterator.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallSet.h"
#include <deque>
+#include <iterator>
using namespace mlir;
@@ -674,6 +679,91 @@ static bool ableToUpdatePredOperands(Block *block) {
return true;
}
+/// Prunes the redundant list of arguments. E.g., if we are passing an argument
+/// list like [x, y, z, x] this would return [x, y, z] and it would update the
+/// `block` (to whom the argument are passed to) accordingly.
+static SmallVector<SmallVector<Value, 8>, 2> pruneRedundantArguments(
+ const SmallVector<SmallVector<Value, 8>, 2> &newArguments,
+ RewriterBase &rewriter, Block *block) {
+
+ SmallVector<SmallVector<Value, 8>, 2> newArgumentsPruned(
+ newArguments.size(), SmallVector<Value, 8>());
+
+ if (newArguments.empty())
+ return newArguments;
+
+ // `newArguments` is a 2D array of size `numLists` x `numArgs`
+ unsigned numLists = newArguments.size();
+ unsigned numArgs = newArguments[0].size();
+
+ // Map that for each arg index contains the index that we can use in place of
+ // the original index. E.g., if we have newArgs = [x, y, z, x], we will have
+ // idxToReplacement[3] = 0
+ llvm::DenseMap<unsigned, unsigned> idxToReplacement;
+
+ // This is a useful data structure to track the first appearance of a Value
+ // on a given list of arguments
+ DenseMap<Value, unsigned> firstValueToIdx;
+ for (unsigned j = 0; j < numArgs; ++j) {
+ Value newArg = newArguments[0][j];
+ if (!firstValueToIdx.contains(newArg))
+ firstValueToIdx[newArg] = j;
+ }
+
+ // Go through the first list of arguments (list 0).
+ for (unsigned j = 0; j < numArgs; ++j) {
+ bool shouldReplaceJ = false;
+ unsigned replacement = 0;
+ // Look back to see if there are possible redundancies in list 0. Please
+ // note that we are using a map to annotate when an argument was seen first
+ // to avoid a O(N^2) algorithm. This has the drawback that if we have two
+ // lists like:
+ // list0: [%a, %a, %a]
+ // list1: [%c, %b, %b]
+ // We cannot simplify it, because firstVlaueToIdx[%a] = 0, but we cannot
+ // point list1[1](==%b) or list1[2](==%b) to list1[0](==%c). However, since
+ // the number of arguments can be potentially unbounded we cannot afford a
+ // O(N^2) algorithm (to search to all the possible pairs) and we need to
+ // accept the trade-off.
+ unsigned k = firstValueToIdx[newArguments[0][j]];
+ if (k != j) {
+ shouldReplaceJ = true;
+ replacement = k;
+ // If a possible redundancy is found, then scan the other lists: we
+ // can prune the arguments if and only if they are redundant in every
+ // list.
+ for (unsigned i = 1; i < numLists; ++i)
+ shouldReplaceJ =
+ shouldReplaceJ && (newArguments[i][k] == newArguments[i][j]);
+ }
+ // Save the replacement.
+ if (shouldReplaceJ)
+ idxToReplacement[j] = replacement;
+ }
+
+ // Populate the pruned argument list.
+ for (unsigned i = 0; i < numLists; ++i)
+ for (unsigned j = 0; j < numArgs; ++j)
+ if (!idxToReplacement.contains(j))
+ newArgumentsPruned[i].push_back(newArguments[i][j]);
+
+ // Replace the block's redundant arguments.
+ SmallVector<unsigned> toErase;
+ for (auto [idx, arg] : llvm::enumerate(block->getArguments())) {
+ if (idxToReplacement.contains(idx)) {
+ Value oldArg = block->getArgument(idx);
+ Value newArg = block->getArgument(idxToReplacement[idx]);
+ rewriter.replaceAllUsesWith(oldArg, newArg);
+ toErase.push_back(idx);
+ }
+ }
+
+ // Erase the block's redundant arguments.
+ for (unsigned idxToErase : llvm::reverse(toErase))
+ block->eraseArgument(idxToErase);
+ return newArgumentsPruned;
+}
+
LogicalResult BlockMergeCluster::merge(RewriterBase &rewriter) {
// Don't consider clusters that don't have blocks to merge.
if (blocksToMerge.empty())
@@ -722,6 +812,10 @@ LogicalResult BlockMergeCluster::merge(RewriterBase &rewriter) {
}
}
}
+
+ // Prune redundant arguments and update the leader block argument list
+ newArguments = pruneRedundantArguments(newArguments, rewriter, leaderBlock);
+
// Update the predecessors for each of the blocks.
auto updatePredecessors = [&](Block *block, unsigned clusterIndex) {
for (auto predIt = block->pred_begin(), predE = block->pred_end();
@@ -818,6 +912,108 @@ static LogicalResult mergeIdenticalBlocks(RewriterBase &rewriter,
return success(anyChanged);
}
+static LogicalResult dropRedundantArguments(RewriterBase &rewriter,
+ Block &block) {
+ SmallVector<size_t> argsToErase;
+
+ // Go through the arguments of the block.
+ for (auto [argIdx, blockOperand] : llvm::enumerate(block.getArguments())) {
+ bool sameArg = true;
+ Value commonValue;
+
+ // Go through the block predecessor and flag if they pass to the block
+ //
diff erent values for the same argument.
+ for (auto predIt = block.pred_begin(), predE = block.pred_end();
+ predIt != predE; ++predIt) {
+ auto branch = dyn_cast<BranchOpInterface>((*predIt)->getTerminator());
+ if (!branch) {
+ sameArg = false;
+ break;
+ }
+ unsigned succIndex = predIt.getSuccessorIndex();
+ SuccessorOperands succOperands = branch.getSuccessorOperands(succIndex);
+ auto branchOperands = succOperands.getForwardedOperands();
+ if (!commonValue) {
+ commonValue = branchOperands[argIdx];
+ } else {
+ if (branchOperands[argIdx] != commonValue) {
+ sameArg = false;
+ break;
+ }
+ }
+ }
+
+ // If they are passing the same value, drop the argument.
+ if (commonValue && sameArg) {
+ argsToErase.push_back(argIdx);
+
+ // Remove the argument from the block.
+ rewriter.replaceAllUsesWith(blockOperand, commonValue);
+ }
+ }
+
+ // Remove the arguments.
+ for (auto argIdx : llvm::reverse(argsToErase)) {
+ block.eraseArgument(argIdx);
+
+ // Remove the argument from the branch ops.
+ for (auto predIt = block.pred_begin(), predE = block.pred_end();
+ predIt != predE; ++predIt) {
+ auto branch = cast<BranchOpInterface>((*predIt)->getTerminator());
+ unsigned succIndex = predIt.getSuccessorIndex();
+ SuccessorOperands succOperands = branch.getSuccessorOperands(succIndex);
+ succOperands.erase(argIdx);
+ }
+ }
+ return success(!argsToErase.empty());
+}
+
+/// This optimization drops redundant argument to blocks. I.e., if a given
+/// argument to a block receives the same value from each of the block
+/// predecessors, we can remove the argument from the block and use directly the
+/// original value. This is a simple example:
+///
+/// %cond = llvm.call @rand() : () -> i1
+/// %val0 = llvm.mlir.constant(1 : i64) : i64
+/// %val1 = llvm.mlir.constant(2 : i64) : i64
+/// %val2 = llvm.mlir.constant(3 : i64) : i64
+/// llvm.cond_br %cond, ^bb1(%val0 : i64, %val1 : i64), ^bb2(%val0 : i64, %val2
+/// : i64)
+///
+/// ^bb1(%arg0 : i64, %arg1 : i64):
+/// llvm.call @foo(%arg0, %arg1)
+///
+/// The previous IR can be rewritten as:
+/// %cond = llvm.call @rand() : () -> i1
+/// %val0 = llvm.mlir.constant(1 : i64) : i64
+/// %val1 = llvm.mlir.constant(2 : i64) : i64
+/// %val2 = llvm.mlir.constant(3 : i64) : i64
+/// llvm.cond_br %cond, ^bb1(%val1 : i64), ^bb2(%val2 : i64)
+///
+/// ^bb1(%arg0 : i64):
+/// llvm.call @foo(%val0, %arg0)
+///
+static LogicalResult dropRedundantArguments(RewriterBase &rewriter,
+ MutableArrayRef<Region> regions) {
+ llvm::SmallSetVector<Region *, 1> worklist;
+ for (Region ®ion : regions)
+ worklist.insert(®ion);
+ bool anyChanged = false;
+ while (!worklist.empty()) {
+ Region *region = worklist.pop_back_val();
+
+ // Add any nested regions to the worklist.
+ for (Block &block : *region) {
+ anyChanged = succeeded(dropRedundantArguments(rewriter, block));
+
+ for (Operation &op : block)
+ for (Region &nestedRegion : op.getRegions())
+ worklist.insert(&nestedRegion);
+ }
+ }
+ return success(anyChanged);
+}
+
//===----------------------------------------------------------------------===//
// Region Simplification
//===----------------------------------------------------------------------===//
@@ -832,8 +1028,12 @@ LogicalResult mlir::simplifyRegions(RewriterBase &rewriter,
bool eliminatedBlocks = succeeded(eraseUnreachableBlocks(rewriter, regions));
bool eliminatedOpsOrArgs = succeeded(runRegionDCE(rewriter, regions));
bool mergedIdenticalBlocks = false;
- if (mergeBlocks)
+ bool droppedRedundantArguments = false;
+ if (mergeBlocks) {
mergedIdenticalBlocks = succeeded(mergeIdenticalBlocks(rewriter, regions));
+ droppedRedundantArguments =
+ succeeded(dropRedundantArguments(rewriter, regions));
+ }
return success(eliminatedBlocks || eliminatedOpsOrArgs ||
- mergedIdenticalBlocks);
+ mergedIdenticalBlocks || droppedRedundantArguments);
}
diff --git a/mlir/test/Dialect/Bufferization/Transforms/OwnershipBasedBufferDeallocation/dealloc-branchop-interface.mlir b/mlir/test/Dialect/Bufferization/Transforms/OwnershipBasedBufferDeallocation/dealloc-branchop-interface.mlir
index 5e8104f83cc4d..8e14990502143 100644
--- a/mlir/test/Dialect/Bufferization/Transforms/OwnershipBasedBufferDeallocation/dealloc-branchop-interface.mlir
+++ b/mlir/test/Dialect/Bufferization/Transforms/OwnershipBasedBufferDeallocation/dealloc-branchop-interface.mlir
@@ -178,7 +178,7 @@ func.func @condBranchDynamicTypeNested(
// CHECK-NEXT: ^bb1
// CHECK-NOT: bufferization.dealloc
// CHECK-NOT: bufferization.clone
-// CHECK: cf.br ^bb5([[ARG1]], %false{{[0-9_]*}} :
+// CHECK: cf.br ^bb6([[ARG1]], %false{{[0-9_]*}} :
// CHECK: ^bb2([[IDX:%.*]]:{{.*}})
// CHECK: [[ALLOC1:%.*]] = memref.alloc([[IDX]])
// CHECK-NEXT: test.buffer_based
@@ -186,20 +186,24 @@ func.func @condBranchDynamicTypeNested(
// CHECK-NEXT: [[OWN:%.+]] = arith.select [[ARG0]], [[ARG0]], [[NOT_ARG0]]
// CHECK-NOT: bufferization.dealloc
// CHECK-NOT: bufferization.clone
-// CHECK: cf.cond_br{{.*}}, ^bb3, ^bb3
+// CHECK: cf.cond_br{{.*}}, ^bb3, ^bb4
// CHECK-NEXT: ^bb3:
// CHECK-NOT: bufferization.dealloc
// CHECK-NOT: bufferization.clone
-// CHECK: cf.br ^bb4([[ALLOC1]], [[OWN]]
-// CHECK-NEXT: ^bb4([[ALLOC2:%.*]]:{{.*}}, [[COND1:%.+]]:{{.*}})
+// CHECK: cf.br ^bb5([[ALLOC1]], [[OWN]]
+// CHECK-NEXT: ^bb4:
// CHECK-NOT: bufferization.dealloc
// CHECK-NOT: bufferization.clone
-// CHECK: cf.br ^bb5([[ALLOC2]], [[COND1]]
-// CHECK-NEXT: ^bb5([[ALLOC4:%.*]]:{{.*}}, [[COND2:%.+]]:{{.*}})
+// CHECK: cf.br ^bb5([[ALLOC1]], [[OWN]]
+// CHECK-NEXT: ^bb5([[ALLOC2:%.*]]:{{.*}}, [[COND1:%.+]]:{{.*}})
+// CHECK-NOT: bufferization.dealloc
+// CHECK-NOT: bufferization.clone
+// CHECK: cf.br ^bb6([[ALLOC2]], [[COND1]]
+// CHECK-NEXT: ^bb6([[ALLOC4:%.*]]:{{.*}}, [[COND2:%.+]]:{{.*}})
// CHECK-NEXT: [[BASE:%[a-zA-Z0-9_]+]]{{.*}} = memref.extract_strided_metadata [[ALLOC4]]
// CHECK-NEXT: [[OWN:%.+]]:2 = bufferization.dealloc ([[BASE]] :{{.*}}) if ([[COND2]]) retain ([[ALLOC4]], [[ARG2]] :
-// CHECK: cf.br ^bb6([[ALLOC4]], [[OWN]]#0
-// CHECK-NEXT: ^bb6([[ALLOC5:%.*]]:{{.*}}, [[COND3:%.+]]:{{.*}})
+// CHECK: cf.br ^bb7([[ALLOC4]], [[OWN]]#0
+// CHECK-NEXT: ^bb7([[ALLOC5:%.*]]:{{.*}}, [[COND3:%.+]]:{{.*}})
// CHECK: test.copy
// CHECK: [[BASE:%[a-zA-Z0-9_]+]]{{.*}} = memref.extract_strided_metadata [[ALLOC5]]
// CHECK-NEXT: bufferization.dealloc ([[BASE]] : {{.*}}) if ([[COND3]])
diff --git a/mlir/test/Dialect/Linalg/detensorize_entry_block.mlir b/mlir/test/Dialect/Linalg/detensorize_entry_block.mlir
index d1a89226fdb58..50a2d6bf532aa 100644
--- a/mlir/test/Dialect/Linalg/detensorize_entry_block.mlir
+++ b/mlir/test/Dialect/Linalg/detensorize_entry_block.mlir
@@ -15,7 +15,7 @@ func.func @main(%arg0: tensor<f32>) -> tensor<f32> {
// CHECK-LABEL: @main
// CHECK-SAME: (%[[ARG0:.+]]: tensor<f32>) -> tensor<f32>
// CHECK: %[[EXTRACTED:.+]] = tensor.extract %[[ARG0]][] : tensor<f32>
-// CHECK: cf.br ^{{.*}}(%[[EXTRACTED]] : f32)
-// CHECK: ^{{.*}}(%[[ARG1:.+]]: f32):
-// CHECK: %[[ELEMENTS:.+]] = tensor.from_elements %[[ARG1]] : tensor<f32>
+// CHECK: cf.br ^{{.*}}
+// CHECK: ^{{.*}}:
+// CHECK: %[[ELEMENTS:.+]] = tensor.from_elements %[[EXTRACTED]] : tensor<f32>
// CHECK: return %[[ELEMENTS]] : tensor<f32>
diff --git a/mlir/test/Dialect/Linalg/detensorize_if.mlir b/mlir/test/Dialect/Linalg/detensorize_if.mlir
index 8d17763c04b6c..c728ad21d2209 100644
--- a/mlir/test/Dialect/Linalg/detensorize_if.mlir
+++ b/mlir/test/Dialect/Linalg/detensorize_if.mlir
@@ -42,18 +42,15 @@ func.func @main() -> (tensor<i32>) attributes {} {
}
// CHECK-LABEL: func @main()
-// CHECK-DAG: arith.constant 0
-// CHECK-DAG: arith.constant 10
-// CHECK: cf.br ^[[bb1:.*]](%{{.*}}: i32)
-// CHECK-NEXT: ^[[bb1]](%{{.*}}: i32):
-// CHECK-NEXT: arith.cmpi slt, %{{.*}}, %{{.*}}
-// CHECK-NEXT: cf.cond_br %{{.*}}, ^[[bb2:.*]](%{{.*}} : i32), ^bb3(%{{.*}} : i32)
-// CHECK-NEXT: ^[[bb2]](%{{.*}}: i32)
-// CHECK-NEXT: arith.addi %{{.*}}, %{{.*}}
-// CHECK-NEXT: cf.br ^[[bb3:.*]](%{{.*}} : i32)
-// CHECK-NEXT: ^[[bb3]](%{{.*}}: i32)
-// CHECK-NEXT: tensor.from_elements %{{.*}} : tensor<i32>
-// CHECK-NEXT: return %{{.*}}
+// CHECK-DAG: %[[cst:.*]] = arith.constant dense<0>
+// CHECK-DAG: arith.constant true
+// CHECK: cf.br
+// CHECK-NEXT: ^[[bb1:.*]]:
+// CHECK-NEXT: cf.cond_br %{{.*}}, ^[[bb2:.*]], ^bb3
+// CHECK-NEXT: ^[[bb2]]
+// CHECK-NEXT: cf.br ^[[bb3:.*]]
+// CHECK-NEXT: ^[[bb3]]
+// CHECK-NEXT: return %[[cst]]
// CHECK-NEXT: }
// -----
@@ -106,20 +103,17 @@ func.func @main() -> (tensor<i32>) attributes {} {
}
// CHECK-LABEL: func @main()
-// CHECK-DAG: arith.constant 0
-// CHECK-DAG: arith.constant 10
-// CHECK: cf.br ^[[bb1:.*]](%{{.*}}: i32)
-// CHECK-NEXT: ^[[bb1]](%{{.*}}: i32):
-// CHECK-NEXT: arith.cmpi slt, %{{.*}}, %{{.*}}
-// CHECK-NEXT: cf.cond_br %{{.*}}, ^[[bb2:.*]](%{{.*}} : i32), ^bb3(%{{.*}} : i32)
-// CHECK-NEXT: ^[[bb2]](%{{.*}}: i32)
-// CHECK-NEXT: arith.addi %{{.*}}, %{{.*}}
-// CHECK-NEXT: cf.br ^[[bb3:.*]](%{{.*}} : i32)
-// CHECK-NEXT: ^[[bb3]](%{{.*}}: i32)
-// CHECK-NEXT: cf.br ^[[bb4:.*]](%{{.*}} : i32)
-// CHECK-NEXT: ^[[bb4]](%{{.*}}: i32)
-// CHECK-NEXT: tensor.from_elements %{{.*}} : tensor<i32>
-// CHECK-NEXT: return %{{.*}}
+// CHECK-DAG: %[[cst:.*]] = arith.constant dense<0>
+// CHECK-DAG: arith.constant true
+// CHECK: cf.br ^[[bb1:.*]]
+// CHECK-NEXT: ^[[bb1:.*]]:
+// CHECK-NEXT: cf.cond_br %{{.*}}, ^[[bb2:.*]], ^bb3
+// CHECK-NEXT: ^[[bb2]]:
+// CHECK-NEXT: cf.br ^[[bb3:.*]]
+// CHECK-NEXT: ^[[bb3]]:
+// CHECK-NEXT: cf.br ^[[bb4:.*]]
+// CHECK-NEXT: ^[[bb4]]:
+// CHECK-NEXT: return %[[cst]]
// CHECK-NEXT: }
// -----
@@ -171,16 +165,13 @@ func.func @main() -> (tensor<i32>) attributes {} {
}
// CHECK-LABEL: func @main()
-// CHECK-DAG: arith.constant 0
-// CHECK-DAG: arith.constant 10
-// CHECK: cf.br ^[[bb1:.*]](%{{.*}}: i32)
-// CHECK-NEXT: ^[[bb1]](%{{.*}}: i32):
-// CHECK-NEXT: arith.cmpi slt, %{{.*}}, %{{.*}}
-// CHECK-NEXT: cf.cond_br %{{.*}}, ^[[bb2:.*]](%{{.*}} : i32), ^bb2(%{{.*}} : i32)
-// CHECK-NEXT: ^[[bb2]](%{{.*}}: i32)
-// CHECK-NEXT: arith.addi %{{.*}}, %{{.*}}
-// CHECK-NEXT: cf.br ^[[bb3:.*]](%{{.*}} : i32)
-// CHECK-NEXT: ^[[bb3]](%{{.*}}: i32)
-// CHECK-NEXT: tensor.from_elements %{{.*}} : tensor<i32>
-// CHECK-NEXT: return %{{.*}}
+// CHECK-DAG: %[[cst:.*]] = arith.constant dense<10>
+// CHECK-DAG: arith.constant true
+// CHECK: cf.br ^[[bb1:.*]]
+// CHECK-NEXT: ^[[bb1]]:
+// CHECK-NEXT: cf.cond_br %{{.*}}, ^[[bb2:.*]], ^bb2
+// CHECK-NEXT: ^[[bb2]]
+// CHECK-NEXT: cf.br ^[[bb3:.*]]
+// CHECK-NEXT: ^[[bb3]]
+// CHECK-NEXT: return %[[cst]]
// CHECK-NEXT: }
diff --git a/mlir/test/Dialect/Linalg/detensorize_while.mlir b/mlir/test/Dialect/Linalg/detensorize_while.mlir
index aa30900f76a33..580a97d3a851b 100644
--- a/mlir/test/Dialect/Linalg/detensorize_while.mlir
+++ b/mlir/test/Dialect/Linalg/detensorize_while.mlir
@@ -46,11 +46,11 @@ func.func @main(%farg0: tensor<i32>, %farg1: tensor<i32>) -> tensor<i32> attribu
// DET-ALL: cf.br ^[[bb1:.*]](%{{.*}} : i32)
// DET-ALL: ^[[bb1]](%{{.*}}: i32)
// DET-ALL: arith.cmpi slt, {{.*}}
-// DET-ALL: cf.cond_br {{.*}}, ^[[bb2:.*]](%{{.*}} : i32), ^[[bb3:.*]](%{{.*}} : i32)
-// DET-ALL: ^[[bb2]](%{{.*}}: i32)
+// DET-ALL: cf.cond_br {{.*}}, ^[[bb2:.*]], ^[[bb3:.*]]
+// DET-ALL: ^[[bb2]]
// DET-ALL: arith.addi {{.*}}
// DET-ALL: cf.br ^[[bb1]](%{{.*}} : i32)
-// DET-ALL: ^[[bb3]](%{{.*}}: i32)
+// DET-ALL: ^[[bb3]]:
// DET-ALL: tensor.from_elements {{.*}}
// DET-ALL: return %{{.*}} : tensor<i32>
@@ -62,10 +62,10 @@ func.func @main(%farg0: tensor<i32>, %farg1: tensor<i32>) -> tensor<i32> attribu
// DET-CF: cf.br ^[[bb1:.*]](%{{.*}} : i32)
// DET-CF: ^[[bb1]](%{{.*}}: i32)
// DET-CF: arith.cmpi slt, {{.*}}
-// DET-CF: cf.cond_br {{.*}}, ^[[bb2:.*]](%{{.*}} : i32), ^[[bb3:.*]](%{{.*}} : i32)
-// DET-CF: ^[[bb2]](%{{.*}}: i32)
+// DET-CF: cf.cond_br {{.*}}, ^[[bb2:.*]], ^[[bb3:.*]]
+// DET-CF: ^[[bb2]]:
// DET-CF: arith.addi {{.*}}
// DET-CF: cf.br ^[[bb1]](%{{.*}} : i32)
-// DET-CF: ^[[bb3]](%{{.*}}: i32)
+// DET-CF: ^[[bb3]]:
// DET-CF: tensor.from_elements %{{.*}} : tensor<i32>
// DET-CF: return %{{.*}} : tensor<i32>
diff --git a/mlir/test/Dialect/Linalg/detensorize_while_impure_cf.mlir b/mlir/test/Dialect/Linalg/detensorize_while_impure_cf.mlir
index 955c7be5ef4c8..414d9b94cbf53 100644
--- a/mlir/test/Dialect/Linalg/detensorize_while_impure_cf.mlir
+++ b/mlir/test/Dialect/Linalg/detensorize_while_impure_cf.mlir
@@ -74,8 +74,8 @@ func.func @main(%farg0: tensor<10xi32>, %farg1: tensor<i32>) -> tensor<i32> attr
// DET-ALL: } -> tensor<i32>
// DET-ALL: tensor.extract %{{.*}}[] : tensor<i32>
// DET-ALL: cmpi slt, %{{.*}}, %{{.*}} : i32
-// DET-ALL: cf.cond_br %{{.*}}, ^[[bb2:.*]](%{{.*}} : i32), ^[[bb3:.*]](%{{.*}} : i32)
-// DET-ALL: ^[[bb2]](%{{.*}}: i32)
+// DET-ALL: cf.cond_br %{{.*}}, ^[[bb2:.*]], ^[[bb3:.*]]
+// DET-ALL: ^[[bb2]]:
// DET-ALL: tensor.from_elements %{{.*}} : tensor<i32>
// DET-ALL: tensor.empty() : tensor<10xi32>
// DET-ALL: linalg.generic {{{.*}}} ins(%{{.*}} : tensor<i32>) outs(%{{.*}} : tensor<10xi32>) {
@@ -83,7 +83,7 @@ func.func @main(%farg0: tensor<10xi32>, %farg1: tensor<i32>) -> tensor<i32> attr
// DET-ALL: linalg.yield %{{.*}} : i32
// DET-ALL: } -> tensor<10xi32>
// DET-ALL: cf.br ^[[bb1]](%{{.*}} : tensor<10xi32>)
-// DET-ALL: ^[[bb3]](%{{.*}}: i32)
+// DET-ALL: ^[[bb3]]
// DET-ALL: tensor.from_elements %{{.*}} : tensor<i32>
// DET-ALL: return %{{.*}} : tensor<i32>
// DET-ALL: }
@@ -95,10 +95,10 @@ func.func @main(%farg0: tensor<10xi32>, %farg1: tensor<i32>) -> tensor<i32> attr
// DET-CF: %{{.*}} = linalg.generic {{{.*}}} ins(%{{.*}} : tensor<10xi32>) outs(%{{.*}} : tensor<i32>) {
// DET-CF: tensor.extract %{{.*}}[] : tensor<i32>
// DET-CF: cmpi slt, %{{.*}}, %{{.*}} : i32
-// DET-CF: cf.cond_br %{{.*}}, ^bb2(%{{.*}} : tensor<i32>), ^bb3(%{{.*}} : tensor<i32>)
-// DET-CF: ^bb2(%{{.*}}: tensor<i32>)
+// DET-CF: cf.cond_br %{{.*}}, ^bb2, ^bb3
+// DET-CF: ^bb2:
// DET-CF: %{{.*}} = linalg.generic {{{.*}}} ins(%{{.*}} : tensor<i32>) outs(%{{.*}} : tensor<10xi32>) {
// DET-CF: cf.br ^bb1(%{{.*}} : tensor<10xi32>)
-// DET-CF: ^bb3(%{{.*}}: tensor<i32>)
+// DET-CF: ^bb3:
// DET-CF: return %{{.*}} : tensor<i32>
// DET-CF: }
diff --git a/mlir/test/Dialect/Linalg/detensorize_while_pure_cf.mlir b/mlir/test/Dialect/Linalg/detensorize_while_pure_cf.mlir
index 6d8d5fe71fca5..913e78272db79 100644
--- a/mlir/test/Dialect/Linalg/detensorize_while_pure_cf.mlir
+++ b/mlir/test/Dialect/Linalg/detensorize_while_pure_cf.mlir
@@ -49,8 +49,8 @@ func.func @main() -> () attributes {} {
// CHECK-NEXT: cf.br ^[[bb1:.*]](%{{.*}} : i32)
// CHECK-NEXT: ^[[bb1]](%{{.*}}: i32)
// CHECK-NEXT: %{{.*}} = arith.cmpi slt, %{{.*}}, %{{.*}}
-// CHECK-NEXT: cf.cond_br %{{.*}}, ^[[bb2:.*]](%{{.*}} : i32), ^[[bb3:.*]]
-// CHECK-NEXT: ^[[bb2]](%{{.*}}: i32)
+// CHECK-NEXT: cf.cond_br %{{.*}}, ^[[bb2:.*]], ^[[bb3:.*]]
+// CHECK-NEXT: ^[[bb2]]
// CHECK-NEXT: %{{.*}} = arith.addi %{{.*}}, %{{.*}}
// CHECK-NEXT: cf.br ^[[bb1]](%{{.*}} : i32)
// CHECK-NEXT: ^[[bb3]]:
diff --git a/mlir/test/Transforms/canonicalize-block-merge.mlir b/mlir/test/Transforms/canonicalize-block-merge.mlir
index 3b8b1fce0575a..92cfde817cf7f 100644
--- a/mlir/test/Transforms/canonicalize-block-merge.mlir
+++ b/mlir/test/Transforms/canonicalize-block-merge.mlir
@@ -87,7 +87,7 @@ func.func @mismatch_operands_matching_arguments(%cond : i1, %arg0 : i32, %arg1 :
// CHECK-LABEL: func @mismatch_argument_uses(
func.func @mismatch_argument_uses(%cond : i1, %arg0 : i32, %arg1 : i32) -> (i32, i32) {
- // CHECK: cf.cond_br %{{.*}}, ^bb1(%{{.*}}), ^bb2
+ // CHECK: return {{.*}}, {{.*}}
cf.cond_br %cond, ^bb1(%arg1 : i32), ^bb2(%arg0 : i32)
@@ -101,7 +101,7 @@ func.func @mismatch_argument_uses(%cond : i1, %arg0 : i32, %arg1 : i32) -> (i32,
// CHECK-LABEL: func @mismatch_argument_types(
func.func @mismatch_argument_types(%cond : i1, %arg0 : i32, %arg1 : i16) {
- // CHECK: cf.cond_br %{{.*}}, ^bb1(%{{.*}}), ^bb2
+ // CHECK: cf.cond_br %{{.*}}, ^bb1, ^bb2
cf.cond_br %cond, ^bb1(%arg0 : i32), ^bb2(%arg1 : i16)
@@ -115,7 +115,7 @@ func.func @mismatch_argument_types(%cond : i1, %arg0 : i32, %arg1 : i16) {
// CHECK-LABEL: func @mismatch_argument_count(
func.func @mismatch_argument_count(%cond : i1, %arg0 : i32) {
- // CHECK: cf.cond_br %{{.*}}, ^bb1(%{{.*}}), ^bb2
+ // CHECK: cf.cond_br %{{.*}}, ^bb1, ^bb2
cf.cond_br %cond, ^bb1(%arg0 : i32), ^bb2
diff --git a/mlir/test/Transforms/canonicalize-dce.mlir b/mlir/test/Transforms/canonicalize-dce.mlir
index ac034d567a26a..84631947970de 100644
--- a/mlir/test/Transforms/canonicalize-dce.mlir
+++ b/mlir/test/Transforms/canonicalize-dce.mlir
@@ -137,10 +137,10 @@ func.func @f(%arg0: f32) {
// Test case: Test the mechanics of deleting multiple block arguments.
// CHECK: func @f(%arg0: tensor<1xf32>, %arg1: tensor<2xf32>, %arg2: tensor<3xf32>, %arg3: tensor<4xf32>, %arg4: tensor<5xf32>)
-// CHECK-NEXT: "test.br"(%arg1, %arg3)[^bb1] : (tensor<2xf32>, tensor<4xf32>)
-// CHECK-NEXT: ^bb1([[VAL0:%.+]]: tensor<2xf32>, [[VAL1:%.+]]: tensor<4xf32>):
-// CHECK-NEXT: "foo.print"([[VAL0]])
-// CHECK-NEXT: "foo.print"([[VAL1]])
+// CHECK-NEXT: "test.br"()[^bb1]
+// CHECK-NEXT: ^bb1:
+// CHECK-NEXT: "foo.print"(%arg1)
+// CHECK-NEXT: "foo.print"(%arg3)
// CHECK-NEXT: return
diff --git a/mlir/test/Transforms/make-isolated-from-above.mlir b/mlir/test/Transforms/make-isolated-from-above.mlir
index 58f6cfbc5dd65..a9d4325944fd9 100644
--- a/mlir/test/Transforms/make-isolated-from-above.mlir
+++ b/mlir/test/Transforms/make-isolated-from-above.mlir
@@ -78,9 +78,9 @@ func.func @make_isolated_from_above_multiple_blocks(%arg0 : index, %arg1 : index
// CHECK-DAG: %[[D1:.+]] = tensor.dim %[[EMPTY]], %[[C1]]
// CHECK: test.isolated_one_region_op %[[ARG2]], %[[C0]], %[[C1]], %[[D0]], %[[D1]]
// CHECK-NEXT: ^bb0(%[[B0:[a-zA-Z0-9]+]]: index, %[[B1:[a-zA-Z0-9]+]]: index, %[[B2:[a-zA-Z0-9]+]]: index, %[[B3:[a-zA-Z0-9]+]]: index, %[[B4:[a-zA-Z0-9]+]]: index)
-// CHECK-NEXT: cf.br ^bb1(%[[B0]] : index)
-// CHECK: ^bb1(%[[B5:.+]]: index)
-// CHECK: "foo.yield"(%[[B1]], %[[B2]], %[[B3]], %[[B4]], %[[B5]])
+// CHECK-NEXT: cf.br ^bb1
+// CHECK: ^bb1:
+// CHECK: "foo.yield"(%[[B1]], %[[B2]], %[[B3]], %[[B4]], %[[B0]])
// CLONE1-LABEL: func @make_isolated_from_above_multiple_blocks(
// CLONE1-SAME: %[[ARG0:[a-zA-Z0-9]+]]: index
@@ -95,9 +95,9 @@ func.func @make_isolated_from_above_multiple_blocks(%arg0 : index, %arg1 : index
// CLONE1-NEXT: ^bb0(%[[B0:[a-zA-Z0-9]+]]: index, %[[B1:[a-zA-Z0-9]+]]: index, %[[B2:[a-zA-Z0-9]+]]: index)
// CLONE1-DAG: %[[C0_0:.+]] = arith.constant 0 : index
// CLONE1-DAG: %[[C1_0:.+]] = arith.constant 1 : index
-// CLONE1-NEXT: cf.br ^bb1(%[[B0]] : index)
-// CLONE1: ^bb1(%[[B3:.+]]: index)
-// CLONE1: "foo.yield"(%[[C0_0]], %[[C1_0]], %[[B1]], %[[B2]], %[[B3]])
+// CLONE1-NEXT: cf.br ^bb1
+// CLONE1: ^bb1:
+// CLONE1: "foo.yield"(%[[C0_0]], %[[C1_0]], %[[B1]], %[[B2]], %[[B0]])
// CLONE2-LABEL: func @make_isolated_from_above_multiple_blocks(
// CLONE2-SAME: %[[ARG0:[a-zA-Z0-9]+]]: index
@@ -110,6 +110,6 @@ func.func @make_isolated_from_above_multiple_blocks(%arg0 : index, %arg1 : index
// CLONE2-DAG: %[[EMPTY:.+]] = tensor.empty(%[[B1]], %[[B2]])
// CLONE2-DAG: %[[D0:.+]] = tensor.dim %[[EMPTY]], %[[C0]]
// CLONE2-DAG: %[[D1:.+]] = tensor.dim %[[EMPTY]], %[[C1]]
-// CLONE2-NEXT: cf.br ^bb1(%[[B0]] : index)
-// CLONE2: ^bb1(%[[B3:.+]]: index)
-// CLONE2: "foo.yield"(%[[C0]], %[[C1]], %[[D0]], %[[D1]], %[[B3]])
+// CLONE2-NEXT: cf.br ^bb1
+// CLONE2: ^bb1:
+// CLONE2: "foo.yield"(%[[C0]], %[[C1]], %[[D0]], %[[D1]], %[[B0]])
diff --git a/mlir/test/Transforms/test-canonicalize-merge-large-blocks.mlir b/mlir/test/Transforms/test-canonicalize-merge-large-blocks.mlir
new file mode 100644
index 0000000000000..e821dcd0c2064
--- /dev/null
+++ b/mlir/test/Transforms/test-canonicalize-merge-large-blocks.mlir
@@ -0,0 +1,162 @@
+ // RUN: mlir-opt -pass-pipeline='builtin.module(llvm.func(canonicalize{region-simplify=aggressive}))' %s | FileCheck %s
+
+llvm.func @foo(%arg0: i64)
+
+llvm.func @rand() -> i1
+
+// CHECK-LABEL: func @large_merge_block(
+llvm.func @large_merge_block(%arg0: i64) {
+ // CHECK: %[[C0:.*]] = llvm.mlir.constant(0 : i64) : i64
+ // CHECK: %[[C1:.*]] = llvm.mlir.constant(1 : i64) : i64
+ // CHECK: %[[C2:.*]] = llvm.mlir.constant(2 : i64) : i64
+ // CHECK: %[[C3:.*]] = llvm.mlir.constant(3 : i64) : i64
+ // CHECK: %[[C4:.*]] = llvm.mlir.constant(4 : i64) : i64
+
+ // CHECK: llvm.cond_br %5, ^bb1(%[[C1]], %[[C3]], %[[C4]], %[[C2]] : i64, i64, i64, i64), ^bb1(%[[C4]], %[[C2]], %[[C1]], %[[C3]] : i64, i64, i64, i64)
+ // CHECK: ^bb{{.*}}(%[[arg0:.*]]: i64, %[[arg1:.*]]: i64, %[[arg2:.*]]: i64, %[[arg3:.*]]: i64):
+ // CHECK: llvm.cond_br %{{.*}}, ^bb2(%[[arg0]] : i64), ^bb2(%[[arg3]] : i64)
+ // CHECK: ^bb{{.*}}(%11: i64):
+ // CHECK: llvm.br ^bb{{.*}}
+ // CHECK: ^bb{{.*}}:
+ // CHECK: llvm.call
+ // CHECK: llvm.cond_br {{.*}}, ^bb{{.*}}(%[[arg1]] : i64), ^bb{{.*}}(%[[arg2]] : i64)
+ // CHECK: ^bb{{.*}}:
+ // CHECK: llvm.call
+ // CHECK llvm.br ^bb{{.*}}
+
+ %0 = llvm.mlir.constant(0 : i64) : i64
+ %1 = llvm.mlir.constant(1 : i64) : i64
+ %2 = llvm.mlir.constant(2 : i64) : i64
+ %3 = llvm.mlir.constant(3 : i64) : i64
+ %4 = llvm.mlir.constant(4 : i64) : i64
+ %10 = llvm.icmp "eq" %arg0, %0 : i64
+ llvm.cond_br %10, ^bb1, ^bb14
+^bb1: // pred: ^bb0
+ %11 = llvm.call @rand() : () -> i1
+ llvm.cond_br %11, ^bb2, ^bb3
+^bb2: // pred: ^bb1
+ llvm.call @foo(%1) : (i64) -> ()
+ llvm.br ^bb4
+^bb3: // pred: ^bb1
+ llvm.call @foo(%2) : (i64) -> ()
+ llvm.br ^bb4
+^bb4: // 2 preds: ^bb2, ^bb3
+ %14 = llvm.call @rand() : () -> i1
+ llvm.cond_br %14, ^bb5, ^bb6
+^bb5: // pred: ^bb4
+ llvm.call @foo(%3) : (i64) -> ()
+ llvm.br ^bb13
+^bb6: // pred: ^bb4
+ llvm.call @foo(%4) : (i64) -> ()
+ llvm.br ^bb13
+^bb13: // 2 preds: ^bb11, ^bb12
+ llvm.br ^bb27
+^bb14: // pred: ^bb0
+ %23 = llvm.call @rand() : () -> i1
+ llvm.cond_br %23, ^bb15, ^bb16
+^bb15: // pred: ^bb14
+ llvm.call @foo(%4) : (i64) -> ()
+ llvm.br ^bb17
+^bb16: // pred: ^bb14
+ llvm.call @foo(%3) : (i64) -> ()
+ llvm.br ^bb17
+^bb17: // 2 preds: ^bb15, ^bb16
+ %26 = llvm.call @rand() : () -> i1
+ llvm.cond_br %26, ^bb18, ^bb19
+^bb18: // pred: ^bb17
+ llvm.call @foo(%2) : (i64) -> ()
+ llvm.br ^bb26
+^bb19: // pred: ^bb17
+ llvm.call @foo(%1) : (i64) -> ()
+ llvm.br ^bb26
+^bb26: // 2 preds: ^bb24, ^bb25
+ llvm.br ^bb27
+^bb27: // 2 preds: ^bb13, ^bb26
+ llvm.return
+}
+
+llvm.func @redundant_args0(%cond : i1) {
+ %0 = llvm.mlir.constant(0 : i64) : i64
+ %2 = llvm.mlir.constant(1 : i64) : i64
+ %3 = llvm.mlir.constant(2 : i64) : i64
+ // CHECK %[[C0:.*]] = llvm.mlir.constant(0 : i64) : i64
+ // CHECK %[[C1:.*]] = llvm.mlir.constant(1 : i64) : i64
+ // CHECK %[[C2:.*]] = llvm.mlir.constant(2 : i64) : i64
+
+ llvm.cond_br %cond, ^bb1, ^bb2
+
+ // CHECK: llvm.cond_br %{{.*}}, ^bb{{.*}}(%[[C0]], %[[C0]] : i64, i64), ^bb{{.*}}(%[[C1]], %[[C2]] : i64, i64)
+ // CHECK: ^bb{{.*}}(%{{.*}}: i64, %{{.*}}: i64)
+^bb1:
+ llvm.call @foo(%0) : (i64) -> ()
+ llvm.call @foo(%0) : (i64) -> ()
+ llvm.br ^bb3
+^bb2:
+ llvm.call @foo(%2) : (i64) -> ()
+ llvm.call @foo(%3) : (i64) -> ()
+ llvm.br ^bb3
+^bb3:
+ llvm.return
+}
+
+llvm.func @redundant_args1(%cond : i1) {
+ %0 = llvm.mlir.constant(0 : i64) : i64
+ %2 = llvm.mlir.constant(1 : i64) : i64
+ %3 = llvm.mlir.constant(2 : i64) : i64
+ // CHECK %[[C0:.*]] = llvm.mlir.constant(0 : i64) : i64
+ // CHECK %[[C1:.*]] = llvm.mlir.constant(1 : i64) : i64
+ // CHECK %[[C2:.*]] = llvm.mlir.constant(2 : i64) : i64
+
+ llvm.cond_br %cond, ^bb1, ^bb2
+
+ // CHECK: llvm.cond_br %{{.*}}, ^bb{{.*}}(%[[C1]], %[[C2]] : i64, i64), ^bb{{.*}}(%[[C0]], %[[C0]] : i64, i64)
+ // CHECK: ^bb{{.*}}(%{{.*}}: i64, %{{.*}}: i64)
+^bb1:
+ llvm.call @foo(%2) : (i64) -> ()
+ llvm.call @foo(%3) : (i64) -> ()
+ llvm.br ^bb3
+^bb2:
+ llvm.call @foo(%0) : (i64) -> ()
+ llvm.call @foo(%0) : (i64) -> ()
+ llvm.br ^bb3
+^bb3:
+ llvm.return
+}
+
+llvm.func @redundant_args_complex(%cond : i1) {
+ %0 = llvm.mlir.constant(0 : i64) : i64
+ %1 = llvm.mlir.constant(1 : i64) : i64
+ %2 = llvm.mlir.constant(2 : i64) : i64
+ %3 = llvm.mlir.constant(3 : i64) : i64
+ // CHECK: %[[C0:.*]] = llvm.mlir.constant(0 : i64) : i64
+ // CHECK: %[[C1:.*]] = llvm.mlir.constant(1 : i64) : i64
+ // CHECK: %[[C2:.*]] = llvm.mlir.constant(2 : i64) : i64
+ // CHECK: %[[C3:.*]] = llvm.mlir.constant(3 : i64) : i64
+
+ llvm.cond_br %cond, ^bb1, ^bb2
+
+ // CHECK: llvm.cond_br %{{.*}}, ^bb{{.*}}(%[[C2]], %[[C1]], %[[C3]] : i64, i64, i64), ^bb{{.*}}(%[[C0]], %[[C3]], %[[C2]] : i64, i64, i64)
+ // CHECK: ^bb{{.*}}(%[[arg0:.*]]: i64, %[[arg1:.*]]: i64, %[[arg2:.*]]: i64):
+ // CHECK: llvm.call @foo(%[[arg0]])
+ // CHECK: llvm.call @foo(%[[arg0]])
+ // CHECK: llvm.call @foo(%[[arg1]])
+ // CHECK: llvm.call @foo(%[[C2]])
+ // CHECK: llvm.call @foo(%[[arg2]])
+
+^bb1:
+ llvm.call @foo(%2) : (i64) -> ()
+ llvm.call @foo(%2) : (i64) -> ()
+ llvm.call @foo(%1) : (i64) -> ()
+ llvm.call @foo(%2) : (i64) -> ()
+ llvm.call @foo(%3) : (i64) -> ()
+ llvm.br ^bb3
+^bb2:
+ llvm.call @foo(%0) : (i64) -> ()
+ llvm.call @foo(%0) : (i64) -> ()
+ llvm.call @foo(%3) : (i64) -> ()
+ llvm.call @foo(%2) : (i64) -> ()
+ llvm.call @foo(%2) : (i64) -> ()
+ llvm.br ^bb3
+^bb3:
+ llvm.return
+}
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