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CGOpenMPRuntimeNVPTX.cpp
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CGOpenMPRuntimeNVPTX.cpp
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//===---- CGOpenMPRuntimeNVPTX.cpp - Interface to OpenMP NVPTX Runtimes ---===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This provides a class for OpenMP runtime code generation specialized to NVPTX
// targets.
//
//===----------------------------------------------------------------------===//
#include "CGOpenMPRuntimeNVPTX.h"
#include "CodeGenFunction.h"
#include "clang/AST/Attr.h"
#include "clang/AST/DeclOpenMP.h"
#include "clang/AST/StmtOpenMP.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Basic/Cuda.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/IR/IntrinsicsNVPTX.h"
using namespace clang;
using namespace CodeGen;
using namespace llvm::omp;
namespace {
enum OpenMPRTLFunctionNVPTX {
/// Call to void __kmpc_kernel_init(kmp_int32 thread_limit,
/// int16_t RequiresOMPRuntime);
OMPRTL_NVPTX__kmpc_kernel_init,
/// Call to void __kmpc_kernel_deinit(int16_t IsOMPRuntimeInitialized);
OMPRTL_NVPTX__kmpc_kernel_deinit,
/// Call to void __kmpc_spmd_kernel_init(kmp_int32 thread_limit,
/// int16_t RequiresOMPRuntime, int16_t RequiresDataSharing);
OMPRTL_NVPTX__kmpc_spmd_kernel_init,
/// Call to void __kmpc_spmd_kernel_deinit_v2(int16_t RequiresOMPRuntime);
OMPRTL_NVPTX__kmpc_spmd_kernel_deinit_v2,
/// Call to void __kmpc_kernel_prepare_parallel(void
/// *outlined_function, int16_t
/// IsOMPRuntimeInitialized);
OMPRTL_NVPTX__kmpc_kernel_prepare_parallel,
/// Call to bool __kmpc_kernel_parallel(void **outlined_function,
/// int16_t IsOMPRuntimeInitialized);
OMPRTL_NVPTX__kmpc_kernel_parallel,
/// Call to void __kmpc_kernel_end_parallel();
OMPRTL_NVPTX__kmpc_kernel_end_parallel,
/// Call to void __kmpc_serialized_parallel(ident_t *loc, kmp_int32
/// global_tid);
OMPRTL_NVPTX__kmpc_serialized_parallel,
/// Call to void __kmpc_end_serialized_parallel(ident_t *loc, kmp_int32
/// global_tid);
OMPRTL_NVPTX__kmpc_end_serialized_parallel,
/// Call to int32_t __kmpc_shuffle_int32(int32_t element,
/// int16_t lane_offset, int16_t warp_size);
OMPRTL_NVPTX__kmpc_shuffle_int32,
/// Call to int64_t __kmpc_shuffle_int64(int64_t element,
/// int16_t lane_offset, int16_t warp_size);
OMPRTL_NVPTX__kmpc_shuffle_int64,
/// Call to __kmpc_nvptx_parallel_reduce_nowait_v2(ident_t *loc, kmp_int32
/// global_tid, kmp_int32 num_vars, size_t reduce_size, void* reduce_data,
/// void (*kmp_ShuffleReductFctPtr)(void *rhsData, int16_t lane_id, int16_t
/// lane_offset, int16_t shortCircuit),
/// void (*kmp_InterWarpCopyFctPtr)(void* src, int32_t warp_num));
OMPRTL_NVPTX__kmpc_nvptx_parallel_reduce_nowait_v2,
/// Call to __kmpc_nvptx_teams_reduce_nowait_v2(ident_t *loc, kmp_int32
/// global_tid, void *global_buffer, int32_t num_of_records, void*
/// reduce_data,
/// void (*kmp_ShuffleReductFctPtr)(void *rhsData, int16_t lane_id, int16_t
/// lane_offset, int16_t shortCircuit),
/// void (*kmp_InterWarpCopyFctPtr)(void* src, int32_t warp_num), void
/// (*kmp_ListToGlobalCpyFctPtr)(void *buffer, int idx, void *reduce_data),
/// void (*kmp_GlobalToListCpyFctPtr)(void *buffer, int idx,
/// void *reduce_data), void (*kmp_GlobalToListCpyPtrsFctPtr)(void *buffer,
/// int idx, void *reduce_data), void (*kmp_GlobalToListRedFctPtr)(void
/// *buffer, int idx, void *reduce_data));
OMPRTL_NVPTX__kmpc_nvptx_teams_reduce_nowait_v2,
/// Call to __kmpc_nvptx_end_reduce_nowait(int32_t global_tid);
OMPRTL_NVPTX__kmpc_end_reduce_nowait,
/// Call to void __kmpc_data_sharing_init_stack();
OMPRTL_NVPTX__kmpc_data_sharing_init_stack,
/// Call to void __kmpc_data_sharing_init_stack_spmd();
OMPRTL_NVPTX__kmpc_data_sharing_init_stack_spmd,
/// Call to void* __kmpc_data_sharing_coalesced_push_stack(size_t size,
/// int16_t UseSharedMemory);
OMPRTL_NVPTX__kmpc_data_sharing_coalesced_push_stack,
/// Call to void __kmpc_data_sharing_pop_stack(void *a);
OMPRTL_NVPTX__kmpc_data_sharing_pop_stack,
/// Call to void __kmpc_begin_sharing_variables(void ***args,
/// size_t n_args);
OMPRTL_NVPTX__kmpc_begin_sharing_variables,
/// Call to void __kmpc_end_sharing_variables();
OMPRTL_NVPTX__kmpc_end_sharing_variables,
/// Call to void __kmpc_get_shared_variables(void ***GlobalArgs)
OMPRTL_NVPTX__kmpc_get_shared_variables,
/// Call to uint16_t __kmpc_parallel_level(ident_t *loc, kmp_int32
/// global_tid);
OMPRTL_NVPTX__kmpc_parallel_level,
/// Call to int8_t __kmpc_is_spmd_exec_mode();
OMPRTL_NVPTX__kmpc_is_spmd_exec_mode,
/// Call to void __kmpc_get_team_static_memory(int16_t isSPMDExecutionMode,
/// const void *buf, size_t size, int16_t is_shared, const void **res);
OMPRTL_NVPTX__kmpc_get_team_static_memory,
/// Call to void __kmpc_restore_team_static_memory(int16_t
/// isSPMDExecutionMode, int16_t is_shared);
OMPRTL_NVPTX__kmpc_restore_team_static_memory,
/// Call to void __kmpc_barrier(ident_t *loc, kmp_int32 global_tid);
OMPRTL__kmpc_barrier,
/// Call to void __kmpc_barrier_simple_spmd(ident_t *loc, kmp_int32
/// global_tid);
OMPRTL__kmpc_barrier_simple_spmd,
/// Call to int32_t __kmpc_warp_active_thread_mask(void);
OMPRTL_NVPTX__kmpc_warp_active_thread_mask,
/// Call to void __kmpc_syncwarp(int32_t Mask);
OMPRTL_NVPTX__kmpc_syncwarp,
};
/// Pre(post)-action for different OpenMP constructs specialized for NVPTX.
class NVPTXActionTy final : public PrePostActionTy {
llvm::FunctionCallee EnterCallee = nullptr;
ArrayRef<llvm::Value *> EnterArgs;
llvm::FunctionCallee ExitCallee = nullptr;
ArrayRef<llvm::Value *> ExitArgs;
bool Conditional = false;
llvm::BasicBlock *ContBlock = nullptr;
public:
NVPTXActionTy(llvm::FunctionCallee EnterCallee,
ArrayRef<llvm::Value *> EnterArgs,
llvm::FunctionCallee ExitCallee,
ArrayRef<llvm::Value *> ExitArgs, bool Conditional = false)
: EnterCallee(EnterCallee), EnterArgs(EnterArgs), ExitCallee(ExitCallee),
ExitArgs(ExitArgs), Conditional(Conditional) {}
void Enter(CodeGenFunction &CGF) override {
llvm::Value *EnterRes = CGF.EmitRuntimeCall(EnterCallee, EnterArgs);
if (Conditional) {
llvm::Value *CallBool = CGF.Builder.CreateIsNotNull(EnterRes);
auto *ThenBlock = CGF.createBasicBlock("omp_if.then");
ContBlock = CGF.createBasicBlock("omp_if.end");
// Generate the branch (If-stmt)
CGF.Builder.CreateCondBr(CallBool, ThenBlock, ContBlock);
CGF.EmitBlock(ThenBlock);
}
}
void Done(CodeGenFunction &CGF) {
// Emit the rest of blocks/branches
CGF.EmitBranch(ContBlock);
CGF.EmitBlock(ContBlock, true);
}
void Exit(CodeGenFunction &CGF) override {
CGF.EmitRuntimeCall(ExitCallee, ExitArgs);
}
};
/// A class to track the execution mode when codegening directives within
/// a target region. The appropriate mode (SPMD|NON-SPMD) is set on entry
/// to the target region and used by containing directives such as 'parallel'
/// to emit optimized code.
class ExecutionRuntimeModesRAII {
private:
CGOpenMPRuntimeNVPTX::ExecutionMode SavedExecMode =
CGOpenMPRuntimeNVPTX::EM_Unknown;
CGOpenMPRuntimeNVPTX::ExecutionMode &ExecMode;
bool SavedRuntimeMode = false;
bool *RuntimeMode = nullptr;
public:
/// Constructor for Non-SPMD mode.
ExecutionRuntimeModesRAII(CGOpenMPRuntimeNVPTX::ExecutionMode &ExecMode)
: ExecMode(ExecMode) {
SavedExecMode = ExecMode;
ExecMode = CGOpenMPRuntimeNVPTX::EM_NonSPMD;
}
/// Constructor for SPMD mode.
ExecutionRuntimeModesRAII(CGOpenMPRuntimeNVPTX::ExecutionMode &ExecMode,
bool &RuntimeMode, bool FullRuntimeMode)
: ExecMode(ExecMode), RuntimeMode(&RuntimeMode) {
SavedExecMode = ExecMode;
SavedRuntimeMode = RuntimeMode;
ExecMode = CGOpenMPRuntimeNVPTX::EM_SPMD;
RuntimeMode = FullRuntimeMode;
}
~ExecutionRuntimeModesRAII() {
ExecMode = SavedExecMode;
if (RuntimeMode)
*RuntimeMode = SavedRuntimeMode;
}
};
/// GPU Configuration: This information can be derived from cuda registers,
/// however, providing compile time constants helps generate more efficient
/// code. For all practical purposes this is fine because the configuration
/// is the same for all known NVPTX architectures.
enum MachineConfiguration : unsigned {
WarpSize = 32,
/// Number of bits required to represent a lane identifier, which is
/// computed as log_2(WarpSize).
LaneIDBits = 5,
LaneIDMask = WarpSize - 1,
/// Global memory alignment for performance.
GlobalMemoryAlignment = 128,
/// Maximal size of the shared memory buffer.
SharedMemorySize = 128,
};
static const ValueDecl *getPrivateItem(const Expr *RefExpr) {
RefExpr = RefExpr->IgnoreParens();
if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(RefExpr)) {
const Expr *Base = ASE->getBase()->IgnoreParenImpCasts();
while (const auto *TempASE = dyn_cast<ArraySubscriptExpr>(Base))
Base = TempASE->getBase()->IgnoreParenImpCasts();
RefExpr = Base;
} else if (auto *OASE = dyn_cast<OMPArraySectionExpr>(RefExpr)) {
const Expr *Base = OASE->getBase()->IgnoreParenImpCasts();
while (const auto *TempOASE = dyn_cast<OMPArraySectionExpr>(Base))
Base = TempOASE->getBase()->IgnoreParenImpCasts();
while (const auto *TempASE = dyn_cast<ArraySubscriptExpr>(Base))
Base = TempASE->getBase()->IgnoreParenImpCasts();
RefExpr = Base;
}
RefExpr = RefExpr->IgnoreParenImpCasts();
if (const auto *DE = dyn_cast<DeclRefExpr>(RefExpr))
return cast<ValueDecl>(DE->getDecl()->getCanonicalDecl());
const auto *ME = cast<MemberExpr>(RefExpr);
return cast<ValueDecl>(ME->getMemberDecl()->getCanonicalDecl());
}
static RecordDecl *buildRecordForGlobalizedVars(
ASTContext &C, ArrayRef<const ValueDecl *> EscapedDecls,
ArrayRef<const ValueDecl *> EscapedDeclsForTeams,
llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *>
&MappedDeclsFields, int BufSize) {
using VarsDataTy = std::pair<CharUnits /*Align*/, const ValueDecl *>;
if (EscapedDecls.empty() && EscapedDeclsForTeams.empty())
return nullptr;
SmallVector<VarsDataTy, 4> GlobalizedVars;
for (const ValueDecl *D : EscapedDecls)
GlobalizedVars.emplace_back(
CharUnits::fromQuantity(std::max(
C.getDeclAlign(D).getQuantity(),
static_cast<CharUnits::QuantityType>(GlobalMemoryAlignment))),
D);
for (const ValueDecl *D : EscapedDeclsForTeams)
GlobalizedVars.emplace_back(C.getDeclAlign(D), D);
llvm::stable_sort(GlobalizedVars, [](VarsDataTy L, VarsDataTy R) {
return L.first > R.first;
});
// Build struct _globalized_locals_ty {
// /* globalized vars */[WarSize] align (max(decl_align,
// GlobalMemoryAlignment))
// /* globalized vars */ for EscapedDeclsForTeams
// };
RecordDecl *GlobalizedRD = C.buildImplicitRecord("_globalized_locals_ty");
GlobalizedRD->startDefinition();
llvm::SmallPtrSet<const ValueDecl *, 16> SingleEscaped(
EscapedDeclsForTeams.begin(), EscapedDeclsForTeams.end());
for (const auto &Pair : GlobalizedVars) {
const ValueDecl *VD = Pair.second;
QualType Type = VD->getType();
if (Type->isLValueReferenceType())
Type = C.getPointerType(Type.getNonReferenceType());
else
Type = Type.getNonReferenceType();
SourceLocation Loc = VD->getLocation();
FieldDecl *Field;
if (SingleEscaped.count(VD)) {
Field = FieldDecl::Create(
C, GlobalizedRD, Loc, Loc, VD->getIdentifier(), Type,
C.getTrivialTypeSourceInfo(Type, SourceLocation()),
/*BW=*/nullptr, /*Mutable=*/false,
/*InitStyle=*/ICIS_NoInit);
Field->setAccess(AS_public);
if (VD->hasAttrs()) {
for (specific_attr_iterator<AlignedAttr> I(VD->getAttrs().begin()),
E(VD->getAttrs().end());
I != E; ++I)
Field->addAttr(*I);
}
} else {
llvm::APInt ArraySize(32, BufSize);
Type = C.getConstantArrayType(Type, ArraySize, nullptr, ArrayType::Normal,
0);
Field = FieldDecl::Create(
C, GlobalizedRD, Loc, Loc, VD->getIdentifier(), Type,
C.getTrivialTypeSourceInfo(Type, SourceLocation()),
/*BW=*/nullptr, /*Mutable=*/false,
/*InitStyle=*/ICIS_NoInit);
Field->setAccess(AS_public);
llvm::APInt Align(32, std::max(C.getDeclAlign(VD).getQuantity(),
static_cast<CharUnits::QuantityType>(
GlobalMemoryAlignment)));
Field->addAttr(AlignedAttr::CreateImplicit(
C, /*IsAlignmentExpr=*/true,
IntegerLiteral::Create(C, Align,
C.getIntTypeForBitwidth(32, /*Signed=*/0),
SourceLocation()),
{}, AttributeCommonInfo::AS_GNU, AlignedAttr::GNU_aligned));
}
GlobalizedRD->addDecl(Field);
MappedDeclsFields.try_emplace(VD, Field);
}
GlobalizedRD->completeDefinition();
return GlobalizedRD;
}
/// Get the list of variables that can escape their declaration context.
class CheckVarsEscapingDeclContext final
: public ConstStmtVisitor<CheckVarsEscapingDeclContext> {
CodeGenFunction &CGF;
llvm::SetVector<const ValueDecl *> EscapedDecls;
llvm::SetVector<const ValueDecl *> EscapedVariableLengthDecls;
llvm::SmallPtrSet<const Decl *, 4> EscapedParameters;
RecordDecl *GlobalizedRD = nullptr;
llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> MappedDeclsFields;
bool AllEscaped = false;
bool IsForCombinedParallelRegion = false;
void markAsEscaped(const ValueDecl *VD) {
// Do not globalize declare target variables.
if (!isa<VarDecl>(VD) ||
OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD))
return;
VD = cast<ValueDecl>(VD->getCanonicalDecl());
// Use user-specified allocation.
if (VD->hasAttrs() && VD->hasAttr<OMPAllocateDeclAttr>())
return;
// Variables captured by value must be globalized.
if (auto *CSI = CGF.CapturedStmtInfo) {
if (const FieldDecl *FD = CSI->lookup(cast<VarDecl>(VD))) {
// Check if need to capture the variable that was already captured by
// value in the outer region.
if (!IsForCombinedParallelRegion) {
if (!FD->hasAttrs())
return;
const auto *Attr = FD->getAttr<OMPCaptureKindAttr>();
if (!Attr)
return;
if (((Attr->getCaptureKind() != OMPC_map) &&
!isOpenMPPrivate(Attr->getCaptureKind())) ||
((Attr->getCaptureKind() == OMPC_map) &&
!FD->getType()->isAnyPointerType()))
return;
}
if (!FD->getType()->isReferenceType()) {
assert(!VD->getType()->isVariablyModifiedType() &&
"Parameter captured by value with variably modified type");
EscapedParameters.insert(VD);
} else if (!IsForCombinedParallelRegion) {
return;
}
}
}
if ((!CGF.CapturedStmtInfo ||
(IsForCombinedParallelRegion && CGF.CapturedStmtInfo)) &&
VD->getType()->isReferenceType())
// Do not globalize variables with reference type.
return;
if (VD->getType()->isVariablyModifiedType())
EscapedVariableLengthDecls.insert(VD);
else
EscapedDecls.insert(VD);
}
void VisitValueDecl(const ValueDecl *VD) {
if (VD->getType()->isLValueReferenceType())
markAsEscaped(VD);
if (const auto *VarD = dyn_cast<VarDecl>(VD)) {
if (!isa<ParmVarDecl>(VarD) && VarD->hasInit()) {
const bool SavedAllEscaped = AllEscaped;
AllEscaped = VD->getType()->isLValueReferenceType();
Visit(VarD->getInit());
AllEscaped = SavedAllEscaped;
}
}
}
void VisitOpenMPCapturedStmt(const CapturedStmt *S,
ArrayRef<OMPClause *> Clauses,
bool IsCombinedParallelRegion) {
if (!S)
return;
for (const CapturedStmt::Capture &C : S->captures()) {
if (C.capturesVariable() && !C.capturesVariableByCopy()) {
const ValueDecl *VD = C.getCapturedVar();
bool SavedIsForCombinedParallelRegion = IsForCombinedParallelRegion;
if (IsCombinedParallelRegion) {
// Check if the variable is privatized in the combined construct and
// those private copies must be shared in the inner parallel
// directive.
IsForCombinedParallelRegion = false;
for (const OMPClause *C : Clauses) {
if (!isOpenMPPrivate(C->getClauseKind()) ||
C->getClauseKind() == OMPC_reduction ||
C->getClauseKind() == OMPC_linear ||
C->getClauseKind() == OMPC_private)
continue;
ArrayRef<const Expr *> Vars;
if (const auto *PC = dyn_cast<OMPFirstprivateClause>(C))
Vars = PC->getVarRefs();
else if (const auto *PC = dyn_cast<OMPLastprivateClause>(C))
Vars = PC->getVarRefs();
else
llvm_unreachable("Unexpected clause.");
for (const auto *E : Vars) {
const Decl *D =
cast<DeclRefExpr>(E)->getDecl()->getCanonicalDecl();
if (D == VD->getCanonicalDecl()) {
IsForCombinedParallelRegion = true;
break;
}
}
if (IsForCombinedParallelRegion)
break;
}
}
markAsEscaped(VD);
if (isa<OMPCapturedExprDecl>(VD))
VisitValueDecl(VD);
IsForCombinedParallelRegion = SavedIsForCombinedParallelRegion;
}
}
}
void buildRecordForGlobalizedVars(bool IsInTTDRegion) {
assert(!GlobalizedRD &&
"Record for globalized variables is built already.");
ArrayRef<const ValueDecl *> EscapedDeclsForParallel, EscapedDeclsForTeams;
if (IsInTTDRegion)
EscapedDeclsForTeams = EscapedDecls.getArrayRef();
else
EscapedDeclsForParallel = EscapedDecls.getArrayRef();
GlobalizedRD = ::buildRecordForGlobalizedVars(
CGF.getContext(), EscapedDeclsForParallel, EscapedDeclsForTeams,
MappedDeclsFields, WarpSize);
}
public:
CheckVarsEscapingDeclContext(CodeGenFunction &CGF,
ArrayRef<const ValueDecl *> TeamsReductions)
: CGF(CGF), EscapedDecls(TeamsReductions.begin(), TeamsReductions.end()) {
}
virtual ~CheckVarsEscapingDeclContext() = default;
void VisitDeclStmt(const DeclStmt *S) {
if (!S)
return;
for (const Decl *D : S->decls())
if (const auto *VD = dyn_cast_or_null<ValueDecl>(D))
VisitValueDecl(VD);
}
void VisitOMPExecutableDirective(const OMPExecutableDirective *D) {
if (!D)
return;
if (!D->hasAssociatedStmt())
return;
if (const auto *S =
dyn_cast_or_null<CapturedStmt>(D->getAssociatedStmt())) {
// Do not analyze directives that do not actually require capturing,
// like `omp for` or `omp simd` directives.
llvm::SmallVector<OpenMPDirectiveKind, 4> CaptureRegions;
getOpenMPCaptureRegions(CaptureRegions, D->getDirectiveKind());
if (CaptureRegions.size() == 1 && CaptureRegions.back() == OMPD_unknown) {
VisitStmt(S->getCapturedStmt());
return;
}
VisitOpenMPCapturedStmt(
S, D->clauses(),
CaptureRegions.back() == OMPD_parallel &&
isOpenMPDistributeDirective(D->getDirectiveKind()));
}
}
void VisitCapturedStmt(const CapturedStmt *S) {
if (!S)
return;
for (const CapturedStmt::Capture &C : S->captures()) {
if (C.capturesVariable() && !C.capturesVariableByCopy()) {
const ValueDecl *VD = C.getCapturedVar();
markAsEscaped(VD);
if (isa<OMPCapturedExprDecl>(VD))
VisitValueDecl(VD);
}
}
}
void VisitLambdaExpr(const LambdaExpr *E) {
if (!E)
return;
for (const LambdaCapture &C : E->captures()) {
if (C.capturesVariable()) {
if (C.getCaptureKind() == LCK_ByRef) {
const ValueDecl *VD = C.getCapturedVar();
markAsEscaped(VD);
if (E->isInitCapture(&C) || isa<OMPCapturedExprDecl>(VD))
VisitValueDecl(VD);
}
}
}
}
void VisitBlockExpr(const BlockExpr *E) {
if (!E)
return;
for (const BlockDecl::Capture &C : E->getBlockDecl()->captures()) {
if (C.isByRef()) {
const VarDecl *VD = C.getVariable();
markAsEscaped(VD);
if (isa<OMPCapturedExprDecl>(VD) || VD->isInitCapture())
VisitValueDecl(VD);
}
}
}
void VisitCallExpr(const CallExpr *E) {
if (!E)
return;
for (const Expr *Arg : E->arguments()) {
if (!Arg)
continue;
if (Arg->isLValue()) {
const bool SavedAllEscaped = AllEscaped;
AllEscaped = true;
Visit(Arg);
AllEscaped = SavedAllEscaped;
} else {
Visit(Arg);
}
}
Visit(E->getCallee());
}
void VisitDeclRefExpr(const DeclRefExpr *E) {
if (!E)
return;
const ValueDecl *VD = E->getDecl();
if (AllEscaped)
markAsEscaped(VD);
if (isa<OMPCapturedExprDecl>(VD))
VisitValueDecl(VD);
else if (const auto *VarD = dyn_cast<VarDecl>(VD))
if (VarD->isInitCapture())
VisitValueDecl(VD);
}
void VisitUnaryOperator(const UnaryOperator *E) {
if (!E)
return;
if (E->getOpcode() == UO_AddrOf) {
const bool SavedAllEscaped = AllEscaped;
AllEscaped = true;
Visit(E->getSubExpr());
AllEscaped = SavedAllEscaped;
} else {
Visit(E->getSubExpr());
}
}
void VisitImplicitCastExpr(const ImplicitCastExpr *E) {
if (!E)
return;
if (E->getCastKind() == CK_ArrayToPointerDecay) {
const bool SavedAllEscaped = AllEscaped;
AllEscaped = true;
Visit(E->getSubExpr());
AllEscaped = SavedAllEscaped;
} else {
Visit(E->getSubExpr());
}
}
void VisitExpr(const Expr *E) {
if (!E)
return;
bool SavedAllEscaped = AllEscaped;
if (!E->isLValue())
AllEscaped = false;
for (const Stmt *Child : E->children())
if (Child)
Visit(Child);
AllEscaped = SavedAllEscaped;
}
void VisitStmt(const Stmt *S) {
if (!S)
return;
for (const Stmt *Child : S->children())
if (Child)
Visit(Child);
}
/// Returns the record that handles all the escaped local variables and used
/// instead of their original storage.
const RecordDecl *getGlobalizedRecord(bool IsInTTDRegion) {
if (!GlobalizedRD)
buildRecordForGlobalizedVars(IsInTTDRegion);
return GlobalizedRD;
}
/// Returns the field in the globalized record for the escaped variable.
const FieldDecl *getFieldForGlobalizedVar(const ValueDecl *VD) const {
assert(GlobalizedRD &&
"Record for globalized variables must be generated already.");
auto I = MappedDeclsFields.find(VD);
if (I == MappedDeclsFields.end())
return nullptr;
return I->getSecond();
}
/// Returns the list of the escaped local variables/parameters.
ArrayRef<const ValueDecl *> getEscapedDecls() const {
return EscapedDecls.getArrayRef();
}
/// Checks if the escaped local variable is actually a parameter passed by
/// value.
const llvm::SmallPtrSetImpl<const Decl *> &getEscapedParameters() const {
return EscapedParameters;
}
/// Returns the list of the escaped variables with the variably modified
/// types.
ArrayRef<const ValueDecl *> getEscapedVariableLengthDecls() const {
return EscapedVariableLengthDecls.getArrayRef();
}
};
} // anonymous namespace
/// Get the GPU warp size.
static llvm::Value *getNVPTXWarpSize(CodeGenFunction &CGF) {
return CGF.EmitRuntimeCall(
llvm::Intrinsic::getDeclaration(
&CGF.CGM.getModule(), llvm::Intrinsic::nvvm_read_ptx_sreg_warpsize),
"nvptx_warp_size");
}
/// Get the id of the current thread on the GPU.
static llvm::Value *getNVPTXThreadID(CodeGenFunction &CGF) {
return CGF.EmitRuntimeCall(
llvm::Intrinsic::getDeclaration(
&CGF.CGM.getModule(), llvm::Intrinsic::nvvm_read_ptx_sreg_tid_x),
"nvptx_tid");
}
/// Get the id of the warp in the block.
/// We assume that the warp size is 32, which is always the case
/// on the NVPTX device, to generate more efficient code.
static llvm::Value *getNVPTXWarpID(CodeGenFunction &CGF) {
CGBuilderTy &Bld = CGF.Builder;
return Bld.CreateAShr(getNVPTXThreadID(CGF), LaneIDBits, "nvptx_warp_id");
}
/// Get the id of the current lane in the Warp.
/// We assume that the warp size is 32, which is always the case
/// on the NVPTX device, to generate more efficient code.
static llvm::Value *getNVPTXLaneID(CodeGenFunction &CGF) {
CGBuilderTy &Bld = CGF.Builder;
return Bld.CreateAnd(getNVPTXThreadID(CGF), Bld.getInt32(LaneIDMask),
"nvptx_lane_id");
}
/// Get the maximum number of threads in a block of the GPU.
static llvm::Value *getNVPTXNumThreads(CodeGenFunction &CGF) {
return CGF.EmitRuntimeCall(
llvm::Intrinsic::getDeclaration(
&CGF.CGM.getModule(), llvm::Intrinsic::nvvm_read_ptx_sreg_ntid_x),
"nvptx_num_threads");
}
/// Get the value of the thread_limit clause in the teams directive.
/// For the 'generic' execution mode, the runtime encodes thread_limit in
/// the launch parameters, always starting thread_limit+warpSize threads per
/// CTA. The threads in the last warp are reserved for master execution.
/// For the 'spmd' execution mode, all threads in a CTA are part of the team.
static llvm::Value *getThreadLimit(CodeGenFunction &CGF,
bool IsInSPMDExecutionMode = false) {
CGBuilderTy &Bld = CGF.Builder;
return IsInSPMDExecutionMode
? getNVPTXNumThreads(CGF)
: Bld.CreateNUWSub(getNVPTXNumThreads(CGF), getNVPTXWarpSize(CGF),
"thread_limit");
}
/// Get the thread id of the OMP master thread.
/// The master thread id is the first thread (lane) of the last warp in the
/// GPU block. Warp size is assumed to be some power of 2.
/// Thread id is 0 indexed.
/// E.g: If NumThreads is 33, master id is 32.
/// If NumThreads is 64, master id is 32.
/// If NumThreads is 1024, master id is 992.
static llvm::Value *getMasterThreadID(CodeGenFunction &CGF) {
CGBuilderTy &Bld = CGF.Builder;
llvm::Value *NumThreads = getNVPTXNumThreads(CGF);
// We assume that the warp size is a power of 2.
llvm::Value *Mask = Bld.CreateNUWSub(getNVPTXWarpSize(CGF), Bld.getInt32(1));
return Bld.CreateAnd(Bld.CreateNUWSub(NumThreads, Bld.getInt32(1)),
Bld.CreateNot(Mask), "master_tid");
}
CGOpenMPRuntimeNVPTX::WorkerFunctionState::WorkerFunctionState(
CodeGenModule &CGM, SourceLocation Loc)
: WorkerFn(nullptr), CGFI(CGM.getTypes().arrangeNullaryFunction()),
Loc(Loc) {
createWorkerFunction(CGM);
}
void CGOpenMPRuntimeNVPTX::WorkerFunctionState::createWorkerFunction(
CodeGenModule &CGM) {
// Create an worker function with no arguments.
WorkerFn = llvm::Function::Create(
CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage,
/*placeholder=*/"_worker", &CGM.getModule());
CGM.SetInternalFunctionAttributes(GlobalDecl(), WorkerFn, CGFI);
WorkerFn->setDoesNotRecurse();
}
CGOpenMPRuntimeNVPTX::ExecutionMode
CGOpenMPRuntimeNVPTX::getExecutionMode() const {
return CurrentExecutionMode;
}
static CGOpenMPRuntimeNVPTX::DataSharingMode
getDataSharingMode(CodeGenModule &CGM) {
return CGM.getLangOpts().OpenMPCUDAMode ? CGOpenMPRuntimeNVPTX::CUDA
: CGOpenMPRuntimeNVPTX::Generic;
}
/// Check for inner (nested) SPMD construct, if any
static bool hasNestedSPMDDirective(ASTContext &Ctx,
const OMPExecutableDirective &D) {
const auto *CS = D.getInnermostCapturedStmt();
const auto *Body =
CS->getCapturedStmt()->IgnoreContainers(/*IgnoreCaptured=*/true);
const Stmt *ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body);
if (const auto *NestedDir =
dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) {
OpenMPDirectiveKind DKind = NestedDir->getDirectiveKind();
switch (D.getDirectiveKind()) {
case OMPD_target:
if (isOpenMPParallelDirective(DKind))
return true;
if (DKind == OMPD_teams) {
Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers(
/*IgnoreCaptured=*/true);
if (!Body)
return false;
ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body);
if (const auto *NND =
dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) {
DKind = NND->getDirectiveKind();
if (isOpenMPParallelDirective(DKind))
return true;
}
}
return false;
case OMPD_target_teams:
return isOpenMPParallelDirective(DKind);
case OMPD_target_simd:
case OMPD_target_parallel:
case OMPD_target_parallel_for:
case OMPD_target_parallel_for_simd:
case OMPD_target_teams_distribute:
case OMPD_target_teams_distribute_simd:
case OMPD_target_teams_distribute_parallel_for:
case OMPD_target_teams_distribute_parallel_for_simd:
case OMPD_parallel:
case OMPD_for:
case OMPD_parallel_for:
case OMPD_parallel_master:
case OMPD_parallel_sections:
case OMPD_for_simd:
case OMPD_parallel_for_simd:
case OMPD_cancel:
case OMPD_cancellation_point:
case OMPD_ordered:
case OMPD_threadprivate:
case OMPD_allocate:
case OMPD_task:
case OMPD_simd:
case OMPD_sections:
case OMPD_section:
case OMPD_single:
case OMPD_master:
case OMPD_critical:
case OMPD_taskyield:
case OMPD_barrier:
case OMPD_taskwait:
case OMPD_taskgroup:
case OMPD_atomic:
case OMPD_flush:
case OMPD_depobj:
case OMPD_scan:
case OMPD_teams:
case OMPD_target_data:
case OMPD_target_exit_data:
case OMPD_target_enter_data:
case OMPD_distribute:
case OMPD_distribute_simd:
case OMPD_distribute_parallel_for:
case OMPD_distribute_parallel_for_simd:
case OMPD_teams_distribute:
case OMPD_teams_distribute_simd:
case OMPD_teams_distribute_parallel_for:
case OMPD_teams_distribute_parallel_for_simd:
case OMPD_target_update:
case OMPD_declare_simd:
case OMPD_declare_variant:
case OMPD_begin_declare_variant:
case OMPD_end_declare_variant:
case OMPD_declare_target:
case OMPD_end_declare_target:
case OMPD_declare_reduction:
case OMPD_declare_mapper:
case OMPD_taskloop:
case OMPD_taskloop_simd:
case OMPD_master_taskloop:
case OMPD_master_taskloop_simd:
case OMPD_parallel_master_taskloop:
case OMPD_parallel_master_taskloop_simd:
case OMPD_requires:
case OMPD_unknown:
llvm_unreachable("Unexpected directive.");
}
}
return false;
}
static bool supportsSPMDExecutionMode(ASTContext &Ctx,
const OMPExecutableDirective &D) {
OpenMPDirectiveKind DirectiveKind = D.getDirectiveKind();
switch (DirectiveKind) {
case OMPD_target:
case OMPD_target_teams:
return hasNestedSPMDDirective(Ctx, D);
case OMPD_target_parallel:
case OMPD_target_parallel_for:
case OMPD_target_parallel_for_simd:
case OMPD_target_teams_distribute_parallel_for:
case OMPD_target_teams_distribute_parallel_for_simd:
case OMPD_target_simd:
case OMPD_target_teams_distribute_simd:
return true;
case OMPD_target_teams_distribute:
return false;
case OMPD_parallel:
case OMPD_for:
case OMPD_parallel_for:
case OMPD_parallel_master:
case OMPD_parallel_sections:
case OMPD_for_simd:
case OMPD_parallel_for_simd:
case OMPD_cancel:
case OMPD_cancellation_point:
case OMPD_ordered:
case OMPD_threadprivate:
case OMPD_allocate:
case OMPD_task:
case OMPD_simd:
case OMPD_sections:
case OMPD_section:
case OMPD_single:
case OMPD_master:
case OMPD_critical:
case OMPD_taskyield:
case OMPD_barrier:
case OMPD_taskwait:
case OMPD_taskgroup:
case OMPD_atomic:
case OMPD_flush:
case OMPD_depobj:
case OMPD_scan:
case OMPD_teams:
case OMPD_target_data:
case OMPD_target_exit_data:
case OMPD_target_enter_data:
case OMPD_distribute:
case OMPD_distribute_simd:
case OMPD_distribute_parallel_for:
case OMPD_distribute_parallel_for_simd:
case OMPD_teams_distribute:
case OMPD_teams_distribute_simd:
case OMPD_teams_distribute_parallel_for:
case OMPD_teams_distribute_parallel_for_simd:
case OMPD_target_update:
case OMPD_declare_simd:
case OMPD_declare_variant:
case OMPD_begin_declare_variant:
case OMPD_end_declare_variant:
case OMPD_declare_target:
case OMPD_end_declare_target:
case OMPD_declare_reduction:
case OMPD_declare_mapper:
case OMPD_taskloop:
case OMPD_taskloop_simd:
case OMPD_master_taskloop:
case OMPD_master_taskloop_simd:
case OMPD_parallel_master_taskloop:
case OMPD_parallel_master_taskloop_simd:
case OMPD_requires:
case OMPD_unknown:
break;
}
llvm_unreachable(
"Unknown programming model for OpenMP directive on NVPTX target.");
}
/// Check if the directive is loops based and has schedule clause at all or has
/// static scheduling.
static bool hasStaticScheduling(const OMPExecutableDirective &D) {
assert(isOpenMPWorksharingDirective(D.getDirectiveKind()) &&
isOpenMPLoopDirective(D.getDirectiveKind()) &&
"Expected loop-based directive.");
return !D.hasClausesOfKind<OMPOrderedClause>() &&
(!D.hasClausesOfKind<OMPScheduleClause>() ||
llvm::any_of(D.getClausesOfKind<OMPScheduleClause>(),
[](const OMPScheduleClause *C) {
return C->getScheduleKind() == OMPC_SCHEDULE_static;
}));
}
/// Check for inner (nested) lightweight runtime construct, if any
static bool hasNestedLightweightDirective(ASTContext &Ctx,
const OMPExecutableDirective &D) {
assert(supportsSPMDExecutionMode(Ctx, D) && "Expected SPMD mode directive.");
const auto *CS = D.getInnermostCapturedStmt();
const auto *Body =
CS->getCapturedStmt()->IgnoreContainers(/*IgnoreCaptured=*/true);
const Stmt *ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body);
if (const auto *NestedDir =
dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) {
OpenMPDirectiveKind DKind = NestedDir->getDirectiveKind();
switch (D.getDirectiveKind()) {
case OMPD_target:
if (isOpenMPParallelDirective(DKind) &&
isOpenMPWorksharingDirective(DKind) && isOpenMPLoopDirective(DKind) &&
hasStaticScheduling(*NestedDir))
return true;
if (DKind == OMPD_teams_distribute_simd || DKind == OMPD_simd)
return true;
if (DKind == OMPD_parallel) {
Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers(
/*IgnoreCaptured=*/true);
if (!Body)
return false;
ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body);
if (const auto *NND =
dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) {
DKind = NND->getDirectiveKind();
if (isOpenMPWorksharingDirective(DKind) &&
isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND))
return true;
}
} else if (DKind == OMPD_teams) {
Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers(
/*IgnoreCaptured=*/true);
if (!Body)
return false;
ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body);
if (const auto *NND =
dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) {
DKind = NND->getDirectiveKind();
if (isOpenMPParallelDirective(DKind) &&
isOpenMPWorksharingDirective(DKind) &&
isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND))
return true;
if (DKind == OMPD_parallel) {
Body = NND->getInnermostCapturedStmt()->IgnoreContainers(
/*IgnoreCaptured=*/true);
if (!Body)
return false;
ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body);
if (const auto *NND =
dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) {
DKind = NND->getDirectiveKind();
if (isOpenMPWorksharingDirective(DKind) &&
isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND))
return true;
}
}
}
}
return false;
case OMPD_target_teams:
if (isOpenMPParallelDirective(DKind) &&
isOpenMPWorksharingDirective(DKind) && isOpenMPLoopDirective(DKind) &&
hasStaticScheduling(*NestedDir))
return true;
if (DKind == OMPD_distribute_simd || DKind == OMPD_simd)
return true;
if (DKind == OMPD_parallel) {
Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers(
/*IgnoreCaptured=*/true);
if (!Body)
return false;
ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body);
if (const auto *NND =
dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) {
DKind = NND->getDirectiveKind();
if (isOpenMPWorksharingDirective(DKind) &&
isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND))
return true;