https://github.com/skatrak created
https://github.com/llvm/llvm-project/pull/150924
This patch updates the allocation of some reduction and private variables
within target regions to use device shared memory rather than private memory.
This is a prerequisite to produce working Generic kernels containing parallel
regions.
In particular, the following situations result in the usage of device shared
memory (only when compiling for the target device if they are placed inside of
a target region representing a Generic kernel):
- Reduction variables on `teams` constructs.
- Private variables on `teams` and `distribute` constructs that are reduced or
used inside of a `parallel` region.
Currently, there is no support for delayed privatization on `teams` constructs,
so private variables on these constructs won't currently be affected. When
support is added, if it uses the existing `allocatePrivateVars` and
`cleanupPrivateVars` functions, usage of device shared memory will be
introduced automatically.
>From 0586e88f442e892ccdc1df03d86368773bc6e636 Mon Sep 17 00:00:00 2001
From: Sergio Afonso <safon...@amd.com>
Date: Fri, 27 Jun 2025 13:29:13 +0100
Subject: [PATCH] [MLIR][OpenMP] Support allocations of device shared memory
This patch updates the allocation of some reduction and private variables
within target regions to use device shared memory rather than private memory.
This is a prerequisite to produce working Generic kernels containing parallel
regions.
In particular, the following situations result in the usage of device shared
memory (only when compiling for the target device if they are placed inside of
a target region representing a Generic kernel):
- Reduction variables on `teams` constructs.
- Private variables on `teams` and `distribute` constructs that are reduced or
used inside of a `parallel` region.
Currently, there is no support for delayed privatization on `teams` constructs,
so private variables on these constructs won't currently be affected. When
support is added, if it uses the existing `allocatePrivateVars` and
`cleanupPrivateVars` functions, usage of device shared memory will be
introduced automatically.
---
.../OpenMP/OpenMPToLLVMIRTranslation.cpp | 227 +++++++++++++-----
.../omptarget-device-shared-memory.mlir | 86 +++++++
2 files changed, 253 insertions(+), 60 deletions(-)
create mode 100644 mlir/test/Target/LLVMIR/omptarget-device-shared-memory.mlir
diff --git
a/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
b/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
index 34358cdcece3c..c5a26cab553cf 100644
--- a/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp
@@ -1102,12 +1102,64 @@ struct DeferredStore {
};
} // namespace
+/// Check whether allocations for the given operation might potentially have to
+/// be done in device shared memory. That means we're compiling for a
offloading
+/// target, the operation is an `omp::TargetOp` or nested inside of one and
that
+/// target region represents a Generic (non-SPMD) kernel.
+///
+/// This represents a necessary but not sufficient set of conditions to use
+/// device shared memory in place of regular allocas. Depending on the
variable,
+/// its uses or the associated OpenMP construct might also need to be taken
into
+/// account.
+static bool
+mightAllocInDeviceSharedMemory(Operation &op,
+ const llvm::OpenMPIRBuilder &ompBuilder) {
+ if (!ompBuilder.Config.isTargetDevice())
+ return false;
+
+ auto targetOp = dyn_cast<omp::TargetOp>(op);
+ if (!targetOp)
+ targetOp = op.getParentOfType<omp::TargetOp>();
+
+ return targetOp &&
+ !bitEnumContainsAny(
+ targetOp.getKernelExecFlags(targetOp.getInnermostCapturedOmpOp()),
+ omp::TargetRegionFlags::spmd);
+}
+
+/// Check whether the entry block argument representing the private copy of a
+/// variable in an OpenMP construct must be allocated in device shared memory,
+/// based on what the uses of that copy are.
+///
+/// This must only be called if a previous call to
+/// \c mightAllocInDeviceSharedMemory has already returned \c true for the
+/// operation that owns the specified block argument.
+static bool mustAllocPrivateVarInDeviceSharedMemory(BlockArgument value) {
+ Operation *parentOp = value.getOwner()->getParentOp();
+ auto targetOp = dyn_cast<omp::TargetOp>(parentOp);
+ if (!targetOp)
+ targetOp = parentOp->getParentOfType<omp::TargetOp>();
+ assert(targetOp && "expected a parent omp.target operation");
+
+ for (auto *user : value.getUsers()) {
+ if (auto parallelOp = dyn_cast<omp::ParallelOp>(user)) {
+ if (llvm::is_contained(parallelOp.getReductionVars(), value))
+ return true;
+ } else if (auto parallelOp = user->getParentOfType<omp::ParallelOp>()) {
+ if (targetOp->isProperAncestor(parallelOp))
+ return true;
+ }
+ }
+
+ return false;
+}
+
/// Allocate space for privatized reduction variables.
/// `deferredStores` contains information to create store operations which
needs
/// to be inserted after all allocas
template <typename T>
static LogicalResult
-allocReductionVars(T loop, ArrayRef<BlockArgument> reductionArgs,
+allocReductionVars(T op, ArrayRef<BlockArgument> reductionArgs,
llvm::IRBuilderBase &builder,
LLVM::ModuleTranslation &moduleTranslation,
const llvm::OpenMPIRBuilder::InsertPointTy &allocaIP,
@@ -1119,10 +1171,14 @@ allocReductionVars(T loop, ArrayRef<BlockArgument>
reductionArgs,
llvm::IRBuilderBase::InsertPointGuard guard(builder);
builder.SetInsertPoint(allocaIP.getBlock()->getTerminator());
+ llvm::OpenMPIRBuilder *ompBuilder = moduleTranslation.getOpenMPBuilder();
+ bool useDeviceSharedMem =
+ isa<omp::TeamsOp>(op) && mightAllocInDeviceSharedMemory(*op,
*ompBuilder);
+
// delay creating stores until after all allocas
- deferredStores.reserve(loop.getNumReductionVars());
+ deferredStores.reserve(op.getNumReductionVars());
- for (std::size_t i = 0; i < loop.getNumReductionVars(); ++i) {
+ for (std::size_t i = 0; i < op.getNumReductionVars(); ++i) {
Region &allocRegion = reductionDecls[i].getAllocRegion();
if (isByRefs[i]) {
if (allocRegion.empty())
@@ -1131,7 +1187,7 @@ allocReductionVars(T loop, ArrayRef<BlockArgument>
reductionArgs,
SmallVector<llvm::Value *, 1> phis;
if (failed(inlineConvertOmpRegions(allocRegion, "omp.reduction.alloc",
builder, moduleTranslation, &phis)))
- return loop.emitError(
+ return op.emitError(
"failed to inline `alloc` region of `omp.declare_reduction`");
assert(phis.size() == 1 && "expected one allocation to be yielded");
@@ -1139,33 +1195,43 @@ allocReductionVars(T loop, ArrayRef<BlockArgument>
reductionArgs,
// Allocate reduction variable (which is a pointer to the real reduction
// variable allocated in the inlined region)
- llvm::Value *var = builder.CreateAlloca(
- moduleTranslation.convertType(reductionDecls[i].getType()));
-
llvm::Type *ptrTy = builder.getPtrTy();
- llvm::Value *castVar =
- builder.CreatePointerBitCastOrAddrSpaceCast(var, ptrTy);
+ llvm::Type *varTy =
+ moduleTranslation.convertType(reductionDecls[i].getType());
+ llvm::Value *var;
+ if (useDeviceSharedMem) {
+ var = ompBuilder->createOMPAllocShared(builder, varTy);
+ } else {
+ var = builder.CreateAlloca(varTy);
+ var = builder.CreatePointerBitCastOrAddrSpaceCast(var, ptrTy);
+ }
+
llvm::Value *castPhi =
builder.CreatePointerBitCastOrAddrSpaceCast(phis[0], ptrTy);
- deferredStores.emplace_back(castPhi, castVar);
+ deferredStores.emplace_back(castPhi, var);
- privateReductionVariables[i] = castVar;
+ privateReductionVariables[i] = var;
moduleTranslation.mapValue(reductionArgs[i], castPhi);
- reductionVariableMap.try_emplace(loop.getReductionVars()[i], castPhi);
+ reductionVariableMap.try_emplace(op.getReductionVars()[i], castPhi);
} else {
assert(allocRegion.empty() &&
"allocaction is implicit for by-val reduction");
- llvm::Value *var = builder.CreateAlloca(
- moduleTranslation.convertType(reductionDecls[i].getType()));
llvm::Type *ptrTy = builder.getPtrTy();
- llvm::Value *castVar =
- builder.CreatePointerBitCastOrAddrSpaceCast(var, ptrTy);
+ llvm::Type *varTy =
+ moduleTranslation.convertType(reductionDecls[i].getType());
+ llvm::Value *var;
+ if (useDeviceSharedMem) {
+ var = ompBuilder->createOMPAllocShared(builder, varTy);
+ } else {
+ var = builder.CreateAlloca(varTy);
+ var = builder.CreatePointerBitCastOrAddrSpaceCast(var, ptrTy);
+ }
- moduleTranslation.mapValue(reductionArgs[i], castVar);
- privateReductionVariables[i] = castVar;
- reductionVariableMap.try_emplace(loop.getReductionVars()[i], castVar);
+ moduleTranslation.mapValue(reductionArgs[i], var);
+ privateReductionVariables[i] = var;
+ reductionVariableMap.try_emplace(op.getReductionVars()[i], var);
}
}
@@ -1227,6 +1293,10 @@ initReductionVars(OP op, ArrayRef<BlockArgument>
reductionArgs,
if (op.getNumReductionVars() == 0)
return success();
+ llvm::OpenMPIRBuilder *ompBuilder = moduleTranslation.getOpenMPBuilder();
+ bool useDeviceSharedMem =
+ isa<omp::TeamsOp>(op) && mightAllocInDeviceSharedMemory(*op,
*ompBuilder);
+
llvm::BasicBlock *initBlock = splitBB(builder, true, "omp.reduction.init");
auto allocaIP = llvm::IRBuilderBase::InsertPoint(
latestAllocaBlock, latestAllocaBlock->getTerminator()->getIterator());
@@ -1241,8 +1311,12 @@ initReductionVars(OP op, ArrayRef<BlockArgument>
reductionArgs,
// TODO: remove after all users of by-ref are updated to use the alloc
// region: Allocate reduction variable (which is a pointer to the real
// reduciton variable allocated in the inlined region)
- byRefVars[i] = builder.CreateAlloca(
- moduleTranslation.convertType(reductionDecls[i].getType()));
+ llvm::Type *varTy =
+ moduleTranslation.convertType(reductionDecls[i].getType());
+ if (useDeviceSharedMem)
+ byRefVars[i] = ompBuilder->createOMPAllocShared(builder, varTy);
+ else
+ byRefVars[i] = builder.CreateAlloca(varTy);
}
}
@@ -1438,10 +1512,20 @@ static LogicalResult createReductionsAndCleanup(
[](omp::DeclareReductionOp reductionDecl) {
return &reductionDecl.getCleanupRegion();
});
- return inlineOmpRegionCleanup(reductionRegions, privateReductionVariables,
- moduleTranslation, builder,
- "omp.reduction.cleanup");
- return success();
+ LogicalResult result = inlineOmpRegionCleanup(
+ reductionRegions, privateReductionVariables, moduleTranslation, builder,
+ "omp.reduction.cleanup");
+
+ bool useDeviceSharedMem =
+ isa<omp::TeamsOp>(op) && mightAllocInDeviceSharedMemory(*op,
*ompBuilder);
+ if (useDeviceSharedMem) {
+ for (auto [var, reductionDecl] :
+ llvm::zip_equal(privateReductionVariables, reductionDecls))
+ ompBuilder->createOMPFreeShared(
+ builder, var,
moduleTranslation.convertType(reductionDecl.getType()));
+ }
+
+ return result;
}
static ArrayRef<bool> getIsByRef(std::optional<ArrayRef<bool>> attr) {
@@ -1586,8 +1670,9 @@ initPrivateVars(llvm::IRBuilderBase &builder,
/// Allocate and initialize delayed private variables. Returns the basic block
/// which comes after all of these allocations. llvm::Value * for each of these
/// private variables are populated in llvmPrivateVars.
+template <typename T>
static llvm::Expected<llvm::BasicBlock *>
-allocatePrivateVars(llvm::IRBuilderBase &builder,
+allocatePrivateVars(T op, llvm::IRBuilderBase &builder,
LLVM::ModuleTranslation &moduleTranslation,
PrivateVarsInfo &privateVarsInfo,
const llvm::OpenMPIRBuilder::InsertPointTy &allocaIP,
@@ -1610,6 +1695,10 @@ allocatePrivateVars(llvm::IRBuilderBase &builder,
llvm::DataLayout dataLayout = builder.GetInsertBlock()->getDataLayout();
llvm::BasicBlock *afterAllocas = allocaTerminator->getSuccessor(0);
+ llvm::OpenMPIRBuilder *ompBuilder = moduleTranslation.getOpenMPBuilder();
+ bool mightUseDeviceSharedMem =
+ isa<omp::TeamsOp, omp::DistributeOp>(*op) &&
+ mightAllocInDeviceSharedMemory(*op, *ompBuilder);
unsigned int allocaAS =
moduleTranslation.getLLVMModule()->getDataLayout().getAllocaAddrSpace();
unsigned int defaultAS = moduleTranslation.getLLVMModule()
@@ -1622,11 +1711,17 @@ allocatePrivateVars(llvm::IRBuilderBase &builder,
llvm::Type *llvmAllocType =
moduleTranslation.convertType(privDecl.getType());
builder.SetInsertPoint(allocaIP.getBlock()->getTerminator());
- llvm::Value *llvmPrivateVar = builder.CreateAlloca(
- llvmAllocType, /*ArraySize=*/nullptr, "omp.private.alloc");
- if (allocaAS != defaultAS)
- llvmPrivateVar = builder.CreateAddrSpaceCast(llvmPrivateVar,
-
builder.getPtrTy(defaultAS));
+ llvm::Value *llvmPrivateVar = nullptr;
+ if (mightUseDeviceSharedMem &&
+ mustAllocPrivateVarInDeviceSharedMemory(blockArg)) {
+ llvmPrivateVar = ompBuilder->createOMPAllocShared(builder,
llvmAllocType);
+ } else {
+ llvmPrivateVar = builder.CreateAlloca(
+ llvmAllocType, /*ArraySize=*/nullptr, "omp.private.alloc");
+ if (allocaAS != defaultAS)
+ llvmPrivateVar = builder.CreateAddrSpaceCast(
+ llvmPrivateVar, builder.getPtrTy(defaultAS));
+ }
privateVarsInfo.llvmVars.push_back(llvmPrivateVar);
}
@@ -1698,24 +1793,41 @@ static LogicalResult copyFirstPrivateVars(
return success();
}
+template <typename T>
static LogicalResult
-cleanupPrivateVars(llvm::IRBuilderBase &builder,
+cleanupPrivateVars(T op, llvm::IRBuilderBase &builder,
LLVM::ModuleTranslation &moduleTranslation, Location loc,
- SmallVectorImpl<llvm::Value *> &llvmPrivateVars,
- SmallVectorImpl<omp::PrivateClauseOp> &privateDecls) {
+ PrivateVarsInfo &privateVarsInfo) {
// private variable deallocation
SmallVector<Region *> privateCleanupRegions;
- llvm::transform(privateDecls, std::back_inserter(privateCleanupRegions),
+ llvm::transform(privateVarsInfo.privatizers,
+ std::back_inserter(privateCleanupRegions),
[](omp::PrivateClauseOp privatizer) {
return &privatizer.getDeallocRegion();
});
- if (failed(inlineOmpRegionCleanup(
- privateCleanupRegions, llvmPrivateVars, moduleTranslation, builder,
- "omp.private.dealloc", /*shouldLoadCleanupRegionArg=*/false)))
+ if (failed(inlineOmpRegionCleanup(privateCleanupRegions,
+ privateVarsInfo.llvmVars,
moduleTranslation,
+ builder, "omp.private.dealloc",
+ /*shouldLoadCleanupRegionArg=*/false)))
return mlir::emitError(loc, "failed to inline `dealloc` region of an "
"`omp.private` op in");
+ llvm::OpenMPIRBuilder *ompBuilder = moduleTranslation.getOpenMPBuilder();
+ bool mightUseDeviceSharedMem =
+ isa<omp::TeamsOp, omp::DistributeOp>(*op) &&
+ mightAllocInDeviceSharedMemory(*op, *ompBuilder);
+ for (auto [privDecl, llvmPrivVar, blockArg] :
+ llvm::zip_equal(privateVarsInfo.privatizers, privateVarsInfo.llvmVars,
+ privateVarsInfo.blockArgs)) {
+ if (mightUseDeviceSharedMem &&
+ mustAllocPrivateVarInDeviceSharedMemory(blockArg)) {
+ ompBuilder->createOMPFreeShared(
+ builder, llvmPrivVar,
+ moduleTranslation.convertType(privDecl.getType()));
+ }
+ }
+
return success();
}
@@ -2382,9 +2494,8 @@ convertOmpTaskOp(omp::TaskOp taskOp, llvm::IRBuilderBase
&builder,
builder.SetInsertPoint(continuationBlockOrError.get()->getTerminator());
- if (failed(cleanupPrivateVars(builder, moduleTranslation, taskOp.getLoc(),
- privateVarsInfo.llvmVars,
- privateVarsInfo.privatizers)))
+ if (failed(cleanupPrivateVars(taskOp, builder, moduleTranslation,
+ taskOp.getLoc(), privateVarsInfo)))
return llvm::make_error<PreviouslyReportedError>();
// Free heap allocated task context structure at the end of the task.
@@ -2501,7 +2612,7 @@ convertOmpWsloop(Operation &opInst, llvm::IRBuilderBase
&builder,
wsloopOp.getNumReductionVars());
llvm::Expected<llvm::BasicBlock *> afterAllocas = allocatePrivateVars(
- builder, moduleTranslation, privateVarsInfo, allocaIP);
+ wsloopOp, builder, moduleTranslation, privateVarsInfo, allocaIP);
if (handleError(afterAllocas, opInst).failed())
return failure();
@@ -2627,9 +2738,8 @@ convertOmpWsloop(Operation &opInst, llvm::IRBuilderBase
&builder,
/*isTeamsReduction=*/false)))
return failure();
- return cleanupPrivateVars(builder, moduleTranslation, wsloopOp.getLoc(),
- privateVarsInfo.llvmVars,
- privateVarsInfo.privatizers);
+ return cleanupPrivateVars(wsloopOp, builder, moduleTranslation,
+ wsloopOp.getLoc(), privateVarsInfo);
}
/// Converts the OpenMP parallel operation to LLVM IR.
@@ -2656,7 +2766,7 @@ convertOmpParallel(omp::ParallelOp opInst,
llvm::IRBuilderBase &builder,
auto bodyGenCB = [&](InsertPointTy allocaIP,
InsertPointTy codeGenIP) -> llvm::Error {
llvm::Expected<llvm::BasicBlock *> afterAllocas = allocatePrivateVars(
- builder, moduleTranslation, privateVarsInfo, allocaIP);
+ opInst, builder, moduleTranslation, privateVarsInfo, allocaIP);
if (handleError(afterAllocas, *opInst).failed())
return llvm::make_error<PreviouslyReportedError>();
@@ -2770,9 +2880,8 @@ convertOmpParallel(omp::ParallelOp opInst,
llvm::IRBuilderBase &builder,
return llvm::createStringError(
"failed to inline `cleanup` region of `omp.declare_reduction`");
- if (failed(cleanupPrivateVars(builder, moduleTranslation, opInst.getLoc(),
- privateVarsInfo.llvmVars,
- privateVarsInfo.privatizers)))
+ if (failed(cleanupPrivateVars(opInst, builder, moduleTranslation,
+ opInst.getLoc(), privateVarsInfo)))
return llvm::make_error<PreviouslyReportedError>();
builder.restoreIP(oldIP);
@@ -2844,7 +2953,7 @@ convertOmpSimd(Operation &opInst, llvm::IRBuilderBase
&builder,
findAllocaInsertPoint(builder, moduleTranslation);
llvm::Expected<llvm::BasicBlock *> afterAllocas = allocatePrivateVars(
- builder, moduleTranslation, privateVarsInfo, allocaIP);
+ simdOp, builder, moduleTranslation, privateVarsInfo, allocaIP);
if (handleError(afterAllocas, opInst).failed())
return failure();
@@ -2958,9 +3067,8 @@ convertOmpSimd(Operation &opInst, llvm::IRBuilderBase
&builder,
"omp.reduction.cleanup")))
return failure();
- return cleanupPrivateVars(builder, moduleTranslation, simdOp.getLoc(),
- privateVarsInfo.llvmVars,
- privateVarsInfo.privatizers);
+ return cleanupPrivateVars(simdOp, builder, moduleTranslation,
simdOp.getLoc(),
+ privateVarsInfo);
}
/// Converts an OpenMP loop nest into LLVM IR using OpenMPIRBuilder.
@@ -4776,8 +4884,8 @@ convertOmpDistribute(Operation &opInst,
llvm::IRBuilderBase &builder,
builder.restoreIP(codeGenIP);
PrivateVarsInfo privVarsInfo(distributeOp);
- llvm::Expected<llvm::BasicBlock *> afterAllocas =
- allocatePrivateVars(builder, moduleTranslation, privVarsInfo,
allocaIP);
+ llvm::Expected<llvm::BasicBlock *> afterAllocas = allocatePrivateVars(
+ distributeOp, builder, moduleTranslation, privVarsInfo, allocaIP);
if (handleError(afterAllocas, opInst).failed())
return llvm::make_error<PreviouslyReportedError>();
@@ -4830,9 +4938,8 @@ convertOmpDistribute(Operation &opInst,
llvm::IRBuilderBase &builder,
return wsloopIP.takeError();
}
- if (failed(cleanupPrivateVars(builder, moduleTranslation,
- distributeOp.getLoc(), privVarsInfo.llvmVars,
- privVarsInfo.privatizers)))
+ if (failed(cleanupPrivateVars(distributeOp, builder, moduleTranslation,
+ distributeOp.getLoc(), privVarsInfo)))
return llvm::make_error<PreviouslyReportedError>();
return llvm::Error::success();
@@ -5555,8 +5662,8 @@ convertOmpTarget(Operation &opInst, llvm::IRBuilderBase
&builder,
PrivateVarsInfo privateVarsInfo(targetOp);
llvm::Expected<llvm::BasicBlock *> afterAllocas =
- allocatePrivateVars(builder, moduleTranslation, privateVarsInfo,
- allocaIP, &mappedPrivateVars);
+ allocatePrivateVars(targetOp, builder, moduleTranslation,
+ privateVarsInfo, allocaIP, &mappedPrivateVars);
if (failed(handleError(afterAllocas, *targetOp)))
return llvm::make_error<PreviouslyReportedError>();
diff --git a/mlir/test/Target/LLVMIR/omptarget-device-shared-memory.mlir
b/mlir/test/Target/LLVMIR/omptarget-device-shared-memory.mlir
new file mode 100644
index 0000000000000..0e08b771633c6
--- /dev/null
+++ b/mlir/test/Target/LLVMIR/omptarget-device-shared-memory.mlir
@@ -0,0 +1,86 @@
+// RUN: mlir-translate -mlir-to-llvmir %s | FileCheck %s
+
+// This test checks that, when compiling for an offloading target, device
shared
+// memory will be used in place of allocas for certain private variables.
+
+module attributes {dlti.dl_spec =
#dlti.dl_spec<#dlti.dl_entry<"dlti.alloca_memory_space", 5 : ui32>>,
llvm.data_layout =
"e-p:64:64-p1:64:64-p2:32:32-p3:32:32-p4:64:64-p5:32:32-p6:32:32-p7:160:256:256:32-p8:128:128:128:48-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64-S32-A5-G1-ni:7:8",
llvm.target_triple = "amdgcn-amd-amdhsa", omp.is_gpu = true,
omp.is_target_device = true} {
+ omp.private {type = private} @privatizer : i32
+ omp.declare_reduction @reduction : i32 init {
+ ^bb0(%arg0: i32):
+ %0 = llvm.mlir.constant(0 : i32) : i32
+ omp.yield(%0 : i32)
+ } combiner {
+ ^bb0(%arg0: i32, %arg1: i32):
+ %0 = llvm.add %arg0, %arg1 : i32
+ omp.yield(%0 : i32)
+ }
+ llvm.func @main() {
+ %c0 = llvm.mlir.constant(1 : i64) : i64
+ %1 = llvm.alloca %c0 x i32 {bindc_name = "x"} : (i64) -> !llvm.ptr<5>
+ %2 = llvm.addrspacecast %1 : !llvm.ptr<5> to !llvm.ptr
+ %3 = llvm.alloca %c0 x i32 {bindc_name = "y"} : (i64) -> !llvm.ptr<5>
+ %4 = llvm.addrspacecast %3 : !llvm.ptr<5> to !llvm.ptr
+ %5 = llvm.alloca %c0 x i32 {bindc_name = "z"} : (i64) -> !llvm.ptr<5>
+ %6 = llvm.addrspacecast %5 : !llvm.ptr<5> to !llvm.ptr
+ %7 = omp.map.info var_ptr(%2 : !llvm.ptr, i32) map_clauses(tofrom)
capture(ByRef) -> !llvm.ptr {name = "x"}
+ %8 = omp.map.info var_ptr(%4 : !llvm.ptr, i32) map_clauses(tofrom)
capture(ByRef) -> !llvm.ptr {name = "y"}
+ %9 = omp.map.info var_ptr(%6 : !llvm.ptr, i32) map_clauses(tofrom)
capture(ByRef) -> !llvm.ptr {name = "z"}
+ omp.target map_entries(%7 -> %arg0, %8 -> %arg1, %9 -> %arg2 : !llvm.ptr,
!llvm.ptr, !llvm.ptr) {
+ %11 = llvm.mlir.constant(10000 : i32) : i32
+ %12 = llvm.mlir.constant(1 : i32) : i32
+ omp.teams reduction(@reduction %arg0 -> %arg3 : !llvm.ptr) {
+ omp.distribute private(@privatizer %arg1 -> %arg4, @privatizer %arg2
-> %arg5 : !llvm.ptr, !llvm.ptr) {
+ omp.loop_nest (%arg6) : i32 = (%12) to (%11) inclusive step (%12) {
+ llvm.store %arg6, %arg4 : i32, !llvm.ptr
+ %13 = llvm.load %arg3 : !llvm.ptr -> i32
+ %14 = llvm.add %13, %12 : i32
+ llvm.store %14, %arg3 : i32, !llvm.ptr
+ omp.parallel reduction(@reduction %arg5 -> %arg7 : !llvm.ptr) {
+ %15 = llvm.load %arg4 : !llvm.ptr -> i32
+ %16 = llvm.load %arg7 : !llvm.ptr -> i32
+ %17 = llvm.add %15, %16 : i32
+ llvm.store %17, %arg7 : i32, !llvm.ptr
+ omp.terminator
+ }
+ omp.yield
+ }
+ }
+ omp.terminator
+ }
+ omp.terminator
+ }
+ llvm.return
+ }
+}
+
+// CHECK: call i32 @__kmpc_target_init
+// CHECK: call void @[[OUTLINED_TARGET:__omp_offloading_[A-Za-z0-9_.]*]]
+
+
+// CHECK: define internal void @[[OUTLINED_TARGET]]
+// CHECK: %[[X_PRIV:.*]] = call align 8 ptr @__kmpc_alloc_shared(i64 4)
+// CHECK: %[[GEP_X:.*]] = getelementptr { {{.*}} }, ptr addrspace(5) %structArg
+// CHECK-NEXT: store ptr %[[X_PRIV]], ptr addrspace(5) %[[GEP_X]]
+// CHECK-NEXT: call void
@[[OUTLINED_TEAMS:__omp_offloading_[A-Za-z0-9_.]*]](ptr %structArg.ascast)
+
+// CHECK: [[REDUCE_FINALIZE_BB:reduce\.finalize.*]]:
+// CHECK-NEXT: %{{.*}} = call i32 @__kmpc_global_thread_num
+// CHECK-NEXT: call void @__kmpc_barrier
+// CHECK-NEXT: call void @__kmpc_free_shared(ptr %[[X_PRIV]], i64 4)
+
+
+// CHECK: define internal void @[[OUTLINED_TEAMS]]
+// CHECK: %[[Y_PRIV:.*]] = call align 8 ptr @__kmpc_alloc_shared(i64 4)
+// CHECK: %[[Z_PRIV:.*]] = call align 8 ptr @__kmpc_alloc_shared(i64 4)
+
+// %[[GEP_Y:.*]] = getelementptr { {{.*}} }, ptr addrspace(5) %structArg
+// store ptr %[[Y_PRIV]], ptr addrspace(5) %[[GEP_Y]], align 8
+// %[[GEP_Z:.*]] = getelementptr { {{.*}} }, ptr addrspace(5) %structArg
+// store ptr %[[Z_PRIV]], ptr addrspace(5) %[[GEP_Z]], align 8
+
+// CHECK: call void @__kmpc_free_shared(ptr %[[Y_PRIV]], i64 4)
+// CHECK-NEXT: call void @__kmpc_free_shared(ptr %[[Z_PRIV]], i64 4)
+// CHECK-NEXT: br label %[[EXIT_BB:.*]]
+
+// CHECK: [[EXIT_BB]]:
+// CHECK-NEXT: ret void
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