void CodeGenFunction::EmitOMPSimdFinal(const OMPLoopDirective &S) {
auto IC = S.counters().begin();
for (auto F : S.finals()) {
if (LocalDeclMap.lookup(cast<DeclRefExpr>((*IC))->getDecl())) {
EmitIgnoredExpr(F);
}
++IC;
}
}
void CodeGenFunction::EmitOMPWorksharingLoop(const OMPLoopDirective &S) {
// Emit the loop iteration variable.
auto IVExpr = cast<DeclRefExpr>(S.getIterationVariable());
auto IVDecl = cast<VarDecl>(IVExpr->getDecl());
EmitVarDecl(*IVDecl);
// Emit the iterations count variable.
// If it is not a variable, Sema decided to calculate iterations count on each
// iteration (e.g., it is foldable into a constant).
if (auto LIExpr = dyn_cast<DeclRefExpr>(S.getLastIteration())) {
EmitVarDecl(*cast<VarDecl>(LIExpr->getDecl()));
// Emit calculation of the iterations count.
EmitIgnoredExpr(S.getCalcLastIteration());
}
auto &RT = CGM.getOpenMPRuntime();
// Check pre-condition.
{
// Skip the entire loop if we don't meet the precondition.
RegionCounter Cnt = getPGORegionCounter(&S);
auto ThenBlock = createBasicBlock("omp.precond.then");
auto ContBlock = createBasicBlock("omp.precond.end");
EmitBranchOnBoolExpr(S.getPreCond(), ThenBlock, ContBlock, Cnt.getCount());
EmitBlock(ThenBlock);
Cnt.beginRegion(Builder);
// Emit 'then' code.
{
// Emit helper vars inits.
LValue LB =
EmitOMPHelperVar(*this, cast<DeclRefExpr>(S.getLowerBoundVariable()));
LValue UB =
EmitOMPHelperVar(*this, cast<DeclRefExpr>(S.getUpperBoundVariable()));
LValue ST =
EmitOMPHelperVar(*this, cast<DeclRefExpr>(S.getStrideVariable()));
LValue IL =
EmitOMPHelperVar(*this, cast<DeclRefExpr>(S.getIsLastIterVariable()));
OMPPrivateScope LoopScope(*this);
EmitPrivateLoopCounters(*this, LoopScope, S.counters());
// Detect the loop schedule kind and chunk.
auto ScheduleKind = OMPC_SCHEDULE_unknown;
llvm::Value *Chunk = nullptr;
if (auto C = cast_or_null<OMPScheduleClause>(
S.getSingleClause(OMPC_schedule))) {
ScheduleKind = C->getScheduleKind();
if (auto Ch = C->getChunkSize()) {
Chunk = EmitScalarExpr(Ch);
Chunk = EmitScalarConversion(Chunk, Ch->getType(),
S.getIterationVariable()->getType());
}
}
const unsigned IVSize = getContext().getTypeSize(IVExpr->getType());
const bool IVSigned = IVExpr->getType()->hasSignedIntegerRepresentation();
if (RT.isStaticNonchunked(ScheduleKind,
/* Chunked */ Chunk != nullptr)) {
// OpenMP [2.7.1, Loop Construct, Description, table 2-1]
// When no chunk_size is specified, the iteration space is divided into
// chunks that are approximately equal in size, and at most one chunk is
// distributed to each thread. Note that the size of the chunks is
// unspecified in this case.
RT.EmitOMPForInit(*this, S.getLocStart(), ScheduleKind, IVSize, IVSigned,
IL.getAddress(), LB.getAddress(), UB.getAddress(),
ST.getAddress());
// UB = min(UB, GlobalUB);
EmitIgnoredExpr(S.getEnsureUpperBound());
// IV = LB;
EmitIgnoredExpr(S.getInit());
// while (idx <= UB) { BODY; ++idx; }
EmitOMPInnerLoop(S, LoopScope);
// Tell the runtime we are done.
RT.EmitOMPForFinish(*this, S.getLocStart(), ScheduleKind);
} else {
// Emit the outer loop, which requests its work chunk [LB..UB] from
// runtime and runs the inner loop to process it.
EmitOMPForOuterLoop(ScheduleKind, S, LoopScope, LB.getAddress(),
UB.getAddress(), ST.getAddress(), IL.getAddress(),
Chunk);
}
}
// We're now done with the loop, so jump to the continuation block.
EmitBranch(ContBlock);
EmitBlock(ContBlock, true);
}
}
