/// \brief Emits code for OpenMP parallel directive in the parallel region.
static void EmitOMPParallelCall(CodeGenFunction &CGF,
const OMPParallelDirective &S,
llvm::Value *OutlinedFn,
llvm::Value *CapturedStruct) {
if (auto C = S.getSingleClause(/*K*/ OMPC_num_threads)) {
CodeGenFunction::RunCleanupsScope NumThreadsScope(CGF);
auto NumThreadsClause = cast<OMPNumThreadsClause>(C);
auto NumThreads = CGF.EmitScalarExpr(NumThreadsClause->getNumThreads(),
/*IgnoreResultAssign*/ true);
CGF.CGM.getOpenMPRuntime().EmitOMPNumThreadsClause(
CGF, NumThreads, NumThreadsClause->getLocStart());
}
CGF.CGM.getOpenMPRuntime().EmitOMPParallelCall(CGF, S.getLocStart(),
OutlinedFn, CapturedStruct);
}
void CodeGenFunction::EmitOMPParallelDirective(const OMPParallelDirective &S) {
auto CS = cast<CapturedStmt>(S.getAssociatedStmt());
auto CapturedStruct = GenerateCapturedStmtArgument(*CS);
auto OutlinedFn = CGM.getOpenMPRuntime().EmitOpenMPOutlinedFunction(
S, *CS->getCapturedDecl()->param_begin());
if (auto C = S.getSingleClause(/*K*/ OMPC_if)) {
auto Cond = cast<OMPIfClause>(C)->getCondition();
EmitOMPIfClause(*this, Cond, [&](bool ThenBlock) {
if (ThenBlock)
EmitOMPParallelCall(*this, S, OutlinedFn, CapturedStruct);
else
CGM.getOpenMPRuntime().EmitOMPSerialCall(*this, S.getLocStart(),
OutlinedFn, CapturedStruct);
});
} else
EmitOMPParallelCall(*this, S, OutlinedFn, CapturedStruct);
}