1 //===- LowerGuardIntrinsic.cpp - Lower the guard intrinsic ---------------===//
8 //===----------------------------------------------------------------------===//
10 // This pass lowers the llvm.experimental.guard intrinsic to a conditional call
14 //===----------------------------------------------------------------------===//
26 #include "llvm/Pass.h"
32     "guards-predicate-pass-branch-weight", cl::Hidden, cl::init(1 << 20),
48                                          CallInst *CI) {  in MakeGuardControlFlowExplicit()  argument
49   OperandBundleDef DeoptOB(*CI->getOperandBundle(LLVMContext::OB_deopt));  in MakeGuardControlFlowExplicit()
50   SmallVector<Value *, 4> Args(std::next(CI->arg_begin()), CI->arg_end());  in MakeGuardControlFlowExplicit()
52   auto *CheckBB = CI->getParent();  in MakeGuardControlFlowExplicit()
54       SplitBlockAndInsertIfThen(CI->getArgOperand(0), CI, true);  in MakeGuardControlFlowExplicit()
56   auto *CheckBI = cast<BranchInst>(CheckBB->getTerminator());  in MakeGuardControlFlowExplicit()
60   CheckBI->swapSuccessors();  in MakeGuardControlFlowExplicit()
62   CheckBI->getSuccessor(0)->setName("guarded");  in MakeGuardControlFlowExplicit()
63   CheckBI->getSuccessor(1)->setName("deopt");  in MakeGuardControlFlowExplicit()
65   if (auto *MD = CI->getMetadata(LLVMContext::MD_make_implicit))  in MakeGuardControlFlowExplicit()
66     CheckBI->setMetadata(LLVMContext::MD_make_implicit, MD);  in MakeGuardControlFlowExplicit()
68   MDBuilder MDB(CI->getContext());  in MakeGuardControlFlowExplicit()
69   CheckBI->setMetadata(LLVMContext::MD_prof,  in MakeGuardControlFlowExplicit()
75   if (DeoptIntrinsic->getReturnType()->isVoidTy()) {  in MakeGuardControlFlowExplicit()
78     DeoptCall->setName("deoptcall");  in MakeGuardControlFlowExplicit()
82   DeoptCall->setCallingConv(CI->getCallingConv());  in MakeGuardControlFlowExplicit()
83   DeoptBlockTerm->eraseFromParent();  in MakeGuardControlFlowExplicit()
89   auto *GuardDecl = F.getParent()->getFunction(  in runOnFunction()
91   if (!GuardDecl || GuardDecl->use_empty())  in runOnFunction()
96     if (auto *CI = dyn_cast<CallInst>(&I))  in runOnFunction()  local
97       if (auto *F = CI->getCalledFunction())  in runOnFunction()
98         if (F->getIntrinsicID() == Intrinsic::experimental_guard)  in runOnFunction()
99           ToLower.push_back(CI);  in runOnFunction()
106   DeoptIntrinsic->setCallingConv(GuardDecl->getCallingConv());  in runOnFunction()
108   for (auto *CI : ToLower) {  in runOnFunction()  local
109     MakeGuardControlFlowExplicit(DeoptIntrinsic, CI);  in runOnFunction()
110     CI->eraseFromParent();  in runOnFunction()
117 INITIALIZE_PASS(LowerGuardIntrinsic, "lower-guard-intrinsic",
121 Pass *llvm::createLowerGuardIntrinsicPass() {  in createLowerGuardIntrinsicPass()