[Openmp-commits] [openmp] ae99966 - [OpenMP] Enable automatic unified shared memory on MI300A. (#77512)
via Openmp-commits
openmp-commits at lists.llvm.org
Mon Jan 22 08:30:26 PST 2024
Author: carlobertolli
Date: 2024-01-22T10:30:22-06:00
New Revision: ae99966a279601022d2b4d61dfbec349f7d65c12
URL: https://github.com/llvm/llvm-project/commit/ae99966a279601022d2b4d61dfbec349f7d65c12
DIFF: https://github.com/llvm/llvm-project/commit/ae99966a279601022d2b4d61dfbec349f7d65c12.diff
LOG: [OpenMP] Enable automatic unified shared memory on MI300A. (#77512)
This patch enables applications that did not request OpenMP
unified_shared_memory to run with the same zero-copy behavior, where
mapped memory does not result in extra memory allocations and memory
copies, but CPU-allocated memory is accessed from the device. The name
for this behavior is "automatic zero-copy" and it relies on detecting:
that the runtime is running on a MI300A, that the user did not select
unified_shared_memory in their program, and that XNACK (unified memory
support) is enabled in the current GPU configuration. If all these
conditions are met, then automatic zero-copy is triggered.
This patch also introduces an environment variable OMPX_APU_MAPS that,
if set, triggers automatic zero-copy also on non APU GPUs (e.g., on
discrete GPUs).
This patch is still missing support for global variables, which will be
provided in a subsequent patch.
Co-authored-by: Thorsten Blass <thorsten.blass at amd.com>
Added:
openmp/libomptarget/test/mapping/auto_zero_copy.cpp
Modified:
openmp/libomptarget/include/Shared/PluginAPI.h
openmp/libomptarget/include/Shared/PluginAPI.inc
openmp/libomptarget/include/Shared/Requirements.h
openmp/libomptarget/include/device.h
openmp/libomptarget/plugins-nextgen/amdgpu/dynamic_hsa/hsa_ext_amd.h
openmp/libomptarget/plugins-nextgen/amdgpu/src/rtl.cpp
openmp/libomptarget/plugins-nextgen/common/include/PluginInterface.h
openmp/libomptarget/plugins-nextgen/common/src/PluginInterface.cpp
openmp/libomptarget/src/OpenMP/Mapping.cpp
openmp/libomptarget/src/PluginManager.cpp
openmp/libomptarget/src/device.cpp
Removed:
################################################################################
diff --git a/openmp/libomptarget/include/Shared/PluginAPI.h b/openmp/libomptarget/include/Shared/PluginAPI.h
index c6aacf4ce2124bb..aece53d7ee1caab 100644
--- a/openmp/libomptarget/include/Shared/PluginAPI.h
+++ b/openmp/libomptarget/include/Shared/PluginAPI.h
@@ -219,6 +219,9 @@ int32_t __tgt_rtl_initialize_record_replay(int32_t DeviceId, int64_t MemorySize,
void *VAddr, bool isRecord,
bool SaveOutput,
uint64_t &ReqPtrArgOffset);
+
+// Returns true if the device \p DeviceId suggests to use auto zero-copy.
+int32_t __tgt_rtl_use_auto_zero_copy(int32_t DeviceId);
}
#endif // OMPTARGET_SHARED_PLUGIN_API_H
diff --git a/openmp/libomptarget/include/Shared/PluginAPI.inc b/openmp/libomptarget/include/Shared/PluginAPI.inc
index 25ebe7d437f9d11..b842c6eef1d4fc7 100644
--- a/openmp/libomptarget/include/Shared/PluginAPI.inc
+++ b/openmp/libomptarget/include/Shared/PluginAPI.inc
@@ -47,3 +47,4 @@ PLUGIN_API_HANDLE(data_notify_mapped, false);
PLUGIN_API_HANDLE(data_notify_unmapped, false);
PLUGIN_API_HANDLE(set_device_offset, false);
PLUGIN_API_HANDLE(initialize_record_replay, false);
+PLUGIN_API_HANDLE(use_auto_zero_copy, false);
diff --git a/openmp/libomptarget/include/Shared/Requirements.h b/openmp/libomptarget/include/Shared/Requirements.h
index 19d6b8ffca495f4..b16a1650f0c4036 100644
--- a/openmp/libomptarget/include/Shared/Requirements.h
+++ b/openmp/libomptarget/include/Shared/Requirements.h
@@ -33,7 +33,12 @@ enum OpenMPOffloadingRequiresDirFlags : int64_t {
/// unified_shared_memory clause.
OMP_REQ_UNIFIED_SHARED_MEMORY = 0x008,
/// dynamic_allocators clause.
- OMP_REQ_DYNAMIC_ALLOCATORS = 0x010
+ OMP_REQ_DYNAMIC_ALLOCATORS = 0x010,
+ /// Auto zero-copy extension:
+ /// when running on an APU, the GPU plugin may decide to
+ /// run in zero-copy even though the user did not program
+ /// their application with unified_shared_memory requirement.
+ OMPX_REQ_AUTO_ZERO_COPY = 0x020
};
class RequirementCollection {
@@ -65,6 +70,14 @@ class RequirementCollection {
return;
}
+ // Auto zero-copy is only valid when no other requirement has been set
+ // and it is computed at device initialization time, after the requirement
+ // flag has already been set to OMP_REQ_NONE.
+ if (SetFlags == OMP_REQ_NONE && NewFlags == OMPX_REQ_AUTO_ZERO_COPY) {
+ SetFlags = NewFlags;
+ return;
+ }
+
// If multiple compilation units are present enforce
// consistency across all of them for require clauses:
// - reverse_offload
diff --git a/openmp/libomptarget/include/device.h b/openmp/libomptarget/include/device.h
index e94f48891dab367..3023fba6cc64db5 100644
--- a/openmp/libomptarget/include/device.h
+++ b/openmp/libomptarget/include/device.h
@@ -164,6 +164,9 @@ struct DeviceTy {
/// Print all offload entries to stderr.
void dumpOffloadEntries();
+ /// Ask the device whether the runtime should use auto zero-copy.
+ bool useAutoZeroCopy();
+
private:
/// Deinitialize the device (and plugin).
void deinit();
diff --git a/openmp/libomptarget/plugins-nextgen/amdgpu/dynamic_hsa/hsa_ext_amd.h b/openmp/libomptarget/plugins-nextgen/amdgpu/dynamic_hsa/hsa_ext_amd.h
index 9c59d3bf824de3c..3117763e35896d3 100644
--- a/openmp/libomptarget/plugins-nextgen/amdgpu/dynamic_hsa/hsa_ext_amd.h
+++ b/openmp/libomptarget/plugins-nextgen/amdgpu/dynamic_hsa/hsa_ext_amd.h
@@ -63,6 +63,7 @@ typedef enum {
} hsa_amd_memory_pool_access_t;
typedef enum hsa_amd_agent_info_s {
+ HSA_AMD_AGENT_INFO_CHIP_ID = 0xA000,
HSA_AMD_AGENT_INFO_CACHELINE_SIZE = 0xA001,
HSA_AMD_AGENT_INFO_COMPUTE_UNIT_COUNT = 0xA002,
HSA_AMD_AGENT_INFO_MAX_CLOCK_FREQUENCY = 0xA003,
diff --git a/openmp/libomptarget/plugins-nextgen/amdgpu/src/rtl.cpp b/openmp/libomptarget/plugins-nextgen/amdgpu/src/rtl.cpp
index 1038a29a18cb84e..8066a231ef93f2c 100644
--- a/openmp/libomptarget/plugins-nextgen/amdgpu/src/rtl.cpp
+++ b/openmp/libomptarget/plugins-nextgen/amdgpu/src/rtl.cpp
@@ -184,6 +184,29 @@ Error asyncMemCopy(bool UseMultipleSdmaEngines, void *Dst, hsa_agent_t DstAgent,
#endif
}
+Expected<std::string> getTargetTripleAndFeatures(hsa_agent_t Agent) {
+ std::string Target;
+ auto Err = utils::iterateAgentISAs(Agent, [&](hsa_isa_t ISA) {
+ uint32_t Length;
+ hsa_status_t Status;
+ Status = hsa_isa_get_info_alt(ISA, HSA_ISA_INFO_NAME_LENGTH, &Length);
+ if (Status != HSA_STATUS_SUCCESS)
+ return Status;
+
+ llvm::SmallVector<char> ISAName(Length);
+ Status = hsa_isa_get_info_alt(ISA, HSA_ISA_INFO_NAME, ISAName.begin());
+ if (Status != HSA_STATUS_SUCCESS)
+ return Status;
+
+ llvm::StringRef TripleTarget(ISAName.begin(), Length);
+ if (TripleTarget.consume_front("amdgcn-amd-amdhsa"))
+ Target = TripleTarget.ltrim('-').rtrim('\0').str();
+ return HSA_STATUS_SUCCESS;
+ });
+ if (Err)
+ return Err;
+ return Target;
+}
} // namespace utils
/// Utility class representing generic resource references to AMDGPU resources.
@@ -1849,8 +1872,9 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
OMPX_StreamBusyWait("LIBOMPTARGET_AMDGPU_STREAM_BUSYWAIT", 2000000),
OMPX_UseMultipleSdmaEngines(
"LIBOMPTARGET_AMDGPU_USE_MULTIPLE_SDMA_ENGINES", false),
- AMDGPUStreamManager(*this, Agent), AMDGPUEventManager(*this),
- AMDGPUSignalManager(*this), Agent(Agent), HostDevice(HostDevice) {}
+ OMPX_ApuMaps("OMPX_APU_MAPS", false), AMDGPUStreamManager(*this, Agent),
+ AMDGPUEventManager(*this), AMDGPUSignalManager(*this), Agent(Agent),
+ HostDevice(HostDevice) {}
~AMDGPUDeviceTy() {}
@@ -1941,6 +1965,19 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
if (auto Err = AMDGPUSignalManager.init(OMPX_InitialNumSignals))
return Err;
+ // Detect if XNACK is enabled
+ auto TargeTripleAndFeaturesOrError =
+ utils::getTargetTripleAndFeatures(Agent);
+ if (!TargeTripleAndFeaturesOrError)
+ return TargeTripleAndFeaturesOrError.takeError();
+ if (static_cast<StringRef>(*TargeTripleAndFeaturesOrError)
+ .contains("xnack+"))
+ IsXnackEnabled = true;
+
+ // detect if device is an APU.
+ if (auto Err = checkIfAPU())
+ return Err;
+
return Plugin::success();
}
@@ -2650,6 +2687,21 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
return Plugin::success();
}
+ /// Returns true if auto zero-copy the best configuration for the current
+ /// arch.
+ /// On AMDGPUs, automatic zero-copy is turned on
+ /// when running on an APU with XNACK (unified memory) support
+ /// enabled. On discrete GPUs, automatic zero-copy is triggered
+ /// if the user sets the environment variable OMPX_APU_MAPS=1
+ /// and if XNACK is enabled. The rationale is that zero-copy
+ /// is the best configuration (performance, memory footprint) on APUs,
+ /// while it is often not the best on discrete GPUs.
+ /// XNACK can be enabled with a kernel boot parameter or with
+ /// the HSA_XNACK environment variable.
+ bool useAutoZeroCopyImpl() override {
+ return ((IsAPU || OMPX_ApuMaps) && IsXnackEnabled);
+ }
+
/// Getters and setters for stack and heap sizes.
Error getDeviceStackSize(uint64_t &Value) override {
Value = StackSize;
@@ -2749,6 +2801,34 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
return Err;
}
+ /// Detect if current architecture is an APU.
+ Error checkIfAPU() {
+ // TODO: replace with ROCr API once it becomes available.
+ llvm::StringRef StrGfxName(ComputeUnitKind);
+ IsAPU = llvm::StringSwitch<bool>(StrGfxName)
+ .Case("gfx940", true)
+ .Default(false);
+ if (IsAPU)
+ return Plugin::success();
+
+ bool MayBeAPU = llvm::StringSwitch<bool>(StrGfxName)
+ .Case("gfx942", true)
+ .Default(false);
+ if (!MayBeAPU)
+ return Plugin::success();
+
+ // can be MI300A or MI300X
+ uint32_t ChipID = 0;
+ if (auto Err = getDeviceAttr(HSA_AMD_AGENT_INFO_CHIP_ID, ChipID))
+ return Err;
+
+ if (!(ChipID & 0x1)) {
+ IsAPU = true;
+ return Plugin::success();
+ }
+ return Plugin::success();
+ }
+
/// Envar for controlling the number of HSA queues per device. High number of
/// queues may degrade performance.
UInt32Envar OMPX_NumQueues;
@@ -2785,6 +2865,10 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
/// Use ROCm 5.7 interface for multiple SDMA engines
BoolEnvar OMPX_UseMultipleSdmaEngines;
+ /// Value of OMPX_APU_MAPS env var used to force
+ /// automatic zero-copy behavior on non-APU GPUs.
+ BoolEnvar OMPX_ApuMaps;
+
/// Stream manager for AMDGPU streams.
AMDGPUStreamManagerTy AMDGPUStreamManager;
@@ -2815,6 +2899,13 @@ struct AMDGPUDeviceTy : public GenericDeviceTy, AMDGenericDeviceTy {
/// The current size of the stack that will be used in cases where it could
/// not be statically determined.
uint64_t StackSize = 16 * 1024 /* 16 KB */;
+
+ /// Is the plugin associated with an APU?
+ bool IsAPU = false;
+
+ /// True is the system is configured with XNACK-Enabled.
+ /// False otherwise.
+ bool IsXnackEnabled = false;
};
Error AMDGPUDeviceImageTy::loadExecutable(const AMDGPUDeviceTy &Device) {
@@ -3059,30 +3150,13 @@ struct AMDGPUPluginTy final : public GenericPluginTy {
std::optional<StringRef> Processor = ElfOrErr->tryGetCPUName();
for (hsa_agent_t Agent : KernelAgents) {
- std::string Target;
- auto Err = utils::iterateAgentISAs(Agent, [&](hsa_isa_t ISA) {
- uint32_t Length;
- hsa_status_t Status;
- Status = hsa_isa_get_info_alt(ISA, HSA_ISA_INFO_NAME_LENGTH, &Length);
- if (Status != HSA_STATUS_SUCCESS)
- return Status;
-
- llvm::SmallVector<char> ISAName(Length);
- Status = hsa_isa_get_info_alt(ISA, HSA_ISA_INFO_NAME, ISAName.begin());
- if (Status != HSA_STATUS_SUCCESS)
- return Status;
-
- llvm::StringRef TripleTarget(ISAName.begin(), Length);
- if (TripleTarget.consume_front("amdgcn-amd-amdhsa"))
- Target = TripleTarget.ltrim('-').rtrim('\0').str();
- return HSA_STATUS_SUCCESS;
- });
- if (Err)
- return std::move(Err);
-
+ auto TargeTripleAndFeaturesOrError =
+ utils::getTargetTripleAndFeatures(Agent);
+ if (!TargeTripleAndFeaturesOrError)
+ return TargeTripleAndFeaturesOrError.takeError();
if (!utils::isImageCompatibleWithEnv(Processor ? *Processor : "",
ElfOrErr->getPlatformFlags(),
- Target))
+ *TargeTripleAndFeaturesOrError))
return false;
}
return true;
diff --git a/openmp/libomptarget/plugins-nextgen/common/include/PluginInterface.h b/openmp/libomptarget/plugins-nextgen/common/include/PluginInterface.h
index f7f723610dd0561..d55dfbdd9e4c1ed 100644
--- a/openmp/libomptarget/plugins-nextgen/common/include/PluginInterface.h
+++ b/openmp/libomptarget/plugins-nextgen/common/include/PluginInterface.h
@@ -883,6 +883,11 @@ struct GenericDeviceTy : public DeviceAllocatorTy {
virtual Error getDeviceStackSize(uint64_t &V) = 0;
+ /// Returns true if current plugin architecture is an APU
+ /// and unified_shared_memory was not requested by the program.
+ bool useAutoZeroCopy();
+ virtual bool useAutoZeroCopyImpl() { return false; }
+
private:
/// Register offload entry for global variable.
Error registerGlobalOffloadEntry(DeviceImageTy &DeviceImage,
diff --git a/openmp/libomptarget/plugins-nextgen/common/src/PluginInterface.cpp b/openmp/libomptarget/plugins-nextgen/common/src/PluginInterface.cpp
index 1bd70b85da3414e..6ae30e78ce8c2fd 100644
--- a/openmp/libomptarget/plugins-nextgen/common/src/PluginInterface.cpp
+++ b/openmp/libomptarget/plugins-nextgen/common/src/PluginInterface.cpp
@@ -1555,6 +1555,8 @@ Error GenericDeviceTy::syncEvent(void *EventPtr) {
return syncEventImpl(EventPtr);
}
+bool GenericDeviceTy::useAutoZeroCopy() { return useAutoZeroCopyImpl(); }
+
Error GenericPluginTy::init() {
auto NumDevicesOrErr = initImpl();
if (!NumDevicesOrErr)
@@ -2067,6 +2069,14 @@ int32_t __tgt_rtl_set_device_offset(int32_t DeviceIdOffset) {
return OFFLOAD_SUCCESS;
}
+int32_t __tgt_rtl_use_auto_zero_copy(int32_t DeviceId) {
+ // Automatic zero-copy only applies to programs that did
+ // not request unified_shared_memory and are deployed on an
+ // APU with XNACK enabled.
+ if (Plugin::get().getRequiresFlags() & OMP_REQ_UNIFIED_SHARED_MEMORY)
+ return false;
+ return Plugin::get().getDevice(DeviceId).useAutoZeroCopy();
+}
#ifdef __cplusplus
}
#endif
diff --git a/openmp/libomptarget/src/OpenMP/Mapping.cpp b/openmp/libomptarget/src/OpenMP/Mapping.cpp
index 833856f2abf290e..9c0b219b6f15f12 100644
--- a/openmp/libomptarget/src/OpenMP/Mapping.cpp
+++ b/openmp/libomptarget/src/OpenMP/Mapping.cpp
@@ -252,8 +252,10 @@ TargetPointerResultTy MappingInfoTy::getTargetPointer(
MESSAGE("device mapping required by 'present' map type modifier does not "
"exist for host address " DPxMOD " (%" PRId64 " bytes)",
DPxPTR(HstPtrBegin), Size);
- } else if (PM->getRequirements() & OMP_REQ_UNIFIED_SHARED_MEMORY &&
- !HasCloseModifier) {
+ } else if ((PM->getRequirements() & OMP_REQ_UNIFIED_SHARED_MEMORY &&
+ !HasCloseModifier) ||
+ (PM->getRequirements() & OMPX_REQ_AUTO_ZERO_COPY)) {
+
// If unified shared memory is active, implicitly mapped variables that are
// not privatized use host address. Any explicitly mapped variables also use
// host address where correctness is not impeded. In all other cases maps
@@ -261,6 +263,10 @@ TargetPointerResultTy MappingInfoTy::getTargetPointer(
// In addition to the mapping rules above, the close map modifier forces the
// mapping of the variable to the device.
if (Size) {
+ INFO(OMP_INFOTYPE_MAPPING_CHANGED, Device.DeviceID,
+ "Return HstPtrBegin " DPxMOD " Size=%" PRId64 " for unified shared "
+ "memory\n",
+ DPxPTR((uintptr_t)HstPtrBegin), Size);
DP("Return HstPtrBegin " DPxMOD " Size=%" PRId64 " for unified shared "
"memory\n",
DPxPTR((uintptr_t)HstPtrBegin), Size);
@@ -415,7 +421,8 @@ TargetPointerResultTy MappingInfoTy::getTgtPtrBegin(
LR.TPR.getEntry()->dynRefCountToStr().c_str(), DynRefCountAction,
LR.TPR.getEntry()->holdRefCountToStr().c_str(), HoldRefCountAction);
LR.TPR.TargetPointer = (void *)TP;
- } else if (PM->getRequirements() & OMP_REQ_UNIFIED_SHARED_MEMORY) {
+ } else if (PM->getRequirements() & OMP_REQ_UNIFIED_SHARED_MEMORY ||
+ PM->getRequirements() & OMPX_REQ_AUTO_ZERO_COPY) {
// If the value isn't found in the mapping and unified shared memory
// is on then it means we have stumbled upon a value which we need to
// use directly from the host.
diff --git a/openmp/libomptarget/src/PluginManager.cpp b/openmp/libomptarget/src/PluginManager.cpp
index 83bf65f0f0de56a..50059ba23b1a77f 100644
--- a/openmp/libomptarget/src/PluginManager.cpp
+++ b/openmp/libomptarget/src/PluginManager.cpp
@@ -144,6 +144,9 @@ void PluginAdaptorTy::initDevices(PluginManager &PM) {
int32_t NumPD = getNumberOfPluginDevices();
ExclusiveDevicesAccessor->reserve(DeviceOffset + NumPD);
+ // Auto zero-copy is a per-device property. We need to ensure
+ // that all devices are suggesting to use it.
+ bool UseAutoZeroCopy = !(NumPD == 0);
for (int32_t PDevI = 0, UserDevId = DeviceOffset; PDevI < NumPD; PDevI++) {
auto Device = std::make_unique<DeviceTy>(this, UserDevId, PDevI);
if (auto Err = Device->init()) {
@@ -151,12 +154,20 @@ void PluginAdaptorTy::initDevices(PluginManager &PM) {
toString(std::move(Err)).c_str());
continue;
}
+ UseAutoZeroCopy = UseAutoZeroCopy && Device->useAutoZeroCopy();
ExclusiveDevicesAccessor->push_back(std::move(Device));
++NumberOfUserDevices;
++UserDevId;
}
+ // Auto Zero-Copy can only be currently triggered when the system is an
+ // homogeneous APU architecture without attached discrete GPUs.
+ // If all devices suggest to use it, change requirment flags to trigger
+ // zero-copy behavior when mapping memory.
+ if (UseAutoZeroCopy)
+ PM.addRequirements(OMPX_REQ_AUTO_ZERO_COPY);
+
DP("Plugin adaptor " DPxMOD " has index %d, exposes %d out of %d devices!\n",
DPxPTR(LibraryHandler.get()), DeviceOffset, NumberOfUserDevices,
NumberOfPluginDevices);
diff --git a/openmp/libomptarget/src/device.cpp b/openmp/libomptarget/src/device.cpp
index 654efd524024a43..404d7b6174e4aab 100644
--- a/openmp/libomptarget/src/device.cpp
+++ b/openmp/libomptarget/src/device.cpp
@@ -339,3 +339,9 @@ void DeviceTy::dumpOffloadEntries() {
fprintf(stderr, " %11s: %s\n", Kind, It.second.getNameAsCStr());
}
}
+
+bool DeviceTy::useAutoZeroCopy() {
+ if (RTL->use_auto_zero_copy)
+ return RTL->use_auto_zero_copy(RTLDeviceID);
+ return false;
+}
diff --git a/openmp/libomptarget/test/mapping/auto_zero_copy.cpp b/openmp/libomptarget/test/mapping/auto_zero_copy.cpp
new file mode 100644
index 000000000000000..6f9d8c2b128c944
--- /dev/null
+++ b/openmp/libomptarget/test/mapping/auto_zero_copy.cpp
@@ -0,0 +1,57 @@
+// clang-format off
+// RUN: %libomptarget-compilexx-generic
+// RUN: env OMPX_APU_MAPS=1 HSA_XNACK=1 LIBOMPTARGET_INFO=30 %libomptarget-run-generic 2>&1 \
+// RUN: | %fcheck-generic -check-prefix=INFO_ZERO -check-prefix=CHECK
+
+// RUN: %libomptarget-compilexx-generic
+// RUN: env HSA_XNACK=0 LIBOMPTARGET_INFO=30 %libomptarget-run-generic 2>&1 \
+// RUN: | %fcheck-generic -check-prefix=INFO_COPY -check-prefix=CHECK
+
+// UNSUPPORTED: aarch64-unknown-linux-gnu
+// UNSUPPORTED: aarch64-unknown-linux-gnu-LTO
+// UNSUPPORTED: nvptx64-nvidia-cuda
+// UNSUPPORTED: nvptx64-nvidia-cuda-LTO
+// UNSUPPORTED: x86_64-pc-linux-gnu
+// UNSUPPORTED: x86_64-pc-linux-gnu-LTO
+
+// REQUIRES: unified_shared_memory
+
+// clang-format on
+
+#include <cstdio>
+
+int main() {
+ int n = 1024;
+
+ // test various mapping types
+ int *a = new int[n];
+ int k = 3;
+ int b[n];
+
+ for (int i = 0; i < n; i++)
+ b[i] = i;
+
+ // clang-format off
+ // INFO_ZERO: Return HstPtrBegin 0x{{.*}} Size=4096 for unified shared memory
+ // INFO_ZERO: Return HstPtrBegin 0x{{.*}} Size=4096 for unified shared memory
+
+ // INFO_COPY: Creating new map entry with HstPtrBase=0x{{.*}}, HstPtrBegin=0x{{.*}}, TgtAllocBegin=0x{{.*}}, TgtPtrBegin=0x{{.*}}, Size=4096,
+ // INFO_COPY: Creating new map entry with HstPtrBase=0x{{.*}}, HstPtrBegin=0x{{.*}}, TgtAllocBegin=0x{{.*}}, TgtPtrBegin=0x{{.*}}, Size=4096,
+ // INFO_COPY: Mapping exists with HstPtrBegin=0x{{.*}}, TgtPtrBegin=0x{{.*}}, Size=4096, DynRefCount=1 (update suppressed)
+ // INFO_COPY: Mapping exists with HstPtrBegin=0x{{.*}}, TgtPtrBegin=0x{{.*}}, Size=4096, DynRefCount=1 (update suppressed)
+// clang-format on
+#pragma omp target teams distribute parallel for map(tofrom : a[ : n]) \
+ map(to : b[ : n])
+ for (int i = 0; i < n; i++)
+ a[i] = i + b[i] + k;
+
+ int err = 0;
+ for (int i = 0; i < n; i++)
+ if (a[i] != i + b[i] + k)
+ err++;
+
+ // CHECK: PASS
+ if (err == 0)
+ printf("PASS\n");
+ return err;
+}
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