Definition at line 105 of file BasicBlock.h. Definition at line 497 of file BasicBlock.cpp. Create a new basic block without inserting it into a function. Referenced by llvm::ARMTargetLowering::EmitInstrWithCustomInserter(). Definition at line 452 of file BasicBlock.h. This method computes the number of uses of this. In the example above, there are 4 basic blocks. If the block previously fell through to that block, it may now need a branch. References BB, I, llvm::unwrap(), and llvm::wrap(). Find and return the merged DebugLoc of the branch instructions of the block. Definition at line 282 of file BasicBlock.h. Returns a pointer to the first instruction in this block that is not a PHINode instruction. Referenced by llvm::MachineFunction::addLandingPad(), llvm::PeelingModuloScheduleExpander::CreateLCSSAExitingBlock(), llvm::AsmPrinter::emitBasicBlockStart(), llvm::SystemZ::emitBlockAfter(), llvm::SelectionDAGBuilder::EmitBranchForMergedCondition(), llvm::VETargetLowering::emitEHSjLjSetJmp(), llvm::PPCTargetLowering::emitEHSjLjSetJmp(), llvm::AArch64TargetLowering::EmitF128CSEL(), emitFROUND(), EmitLoweredCascadedSelect(), llvm::PPCTargetLowering::emitProbedAlloca(), emitXBegin(), llvm::FastISel::fastEmitBranch(), llvm::SelectionDAGBuilder::FindMergedConditions(), llvm::FastISel::finishCondBranch(), getBranchHint(), getFullName(), getName(), INITIALIZE_PASS(), llvm::PPCFrameLowering::inlineStackProbe(), llvm::SystemZXPLINKFrameLowering::inlineStackProbe(), insertDivByZeroTrap(), llvm::MipsAsmPrinter::isBlockOnlyReachableByFallthrough(), llvm::WebAssemblyException::print(), printName(), llvm::ARMBlockPlacement::revertWhileToDoLoop(), llvm::shouldOptForSize(), llvm::SelectionDAG::shouldOptForSize(), splitAt(), and splitMBB(). This should work most of the time when considering optimizing the rest of code in the block, except for certain cases where pseudo probes are designed to block the optimizations. Referenced by llvm::VETargetLowering::emitEHSjLjSetJmp(). If InsertBefore is provided, inserts before that basic block, otherwise inserts at the end. If UpdateLiveIns is true, this will ensure the live ins list is accurate, including for physreg uses/defs in the original block. Definition at line 209 of file BasicBlock.cpp. References llvm::User::getOperand(), llvm::ilist_node_with_parent< NodeTy, ParentTy, Options >::getPrevNode(), and llvm::ReturnInst::getReturnValue(). Remove successor from the successors list of this MachineBasicBlock. The BasicBlocks parameter is a pointer to a pre-allocated array of LLVMBasicBlockRef of at least LLVMCountBasicBlocks() in length. In non-asserts builds, it is defined as a no-op inline function in BasicBlock.h. If the Parent parameter is specified, the basic block is automatically inserted at either the end of the function (if InsertBefore is 0), or before the specified basic block. References BB, getParent(), llvm::unwrap(), and llvm::wrap(). Returns a pointer to the symbol table if one exists. Referenced by llvm::MachineInstr::removeFromBundle(). Definition at line 321 of file MachineBasicBlock.h. Referenced by addBoundsChecking(), assureFPCallStub(), buildUMulWithOverflowFunc(), llvm::CloneBasicBlock(), convertToGuardPredicates(), createAndInsertBasicBlocks(), llvm::OpenMPIRBuilder::createCopyinClauseBlocks(), llvm::MIRParserImpl::createDummyFunction(), createEmptyFunction(), createFPFnStub(), createFrameHelperMachineFunction(), llvm::OpenMPIRBuilder::createLoopSkeleton(), llvm::createMemCpyLoopKnownSize(), createMemMoveLoop(), createMemSetLoop(), llvm::OpenMPIRBuilder::createReductions(), createResumeEntryBlock(), llvm::createSanitizerCtor(), llvm::OpenMPIRBuilder::createSections(), llvm::Attributor::createShallowWrapper(), llvm::OpenMPIRBuilder::createTargetInit(), llvm::OpenMPIRBuilder::createTask(), createWrapper(), llvm::ehAwareSplitEdge(), llvm::orc::IRSpeculationLayer::emit(), llvm::OpenMPIRBuilder::emitCancelationCheckImpl(), llvm::CodeExtractor::extractCodeRegion(), findOrCreatePHIBlock(), llvm::SanitizerStatReport::finish(), getStrlenWithNull(), insertUniqueBackedgeBlock(), LLVMAppendBasicBlockInContext(), LLVMCreateBasicBlockInContext(), LLVMInsertBasicBlockInContext(), lowerFunnelShifts(), lowerIntrinsicToFunction(), llvm::orc::makeStub(), markAliveBlocks(), MergeCompatibleInvokesImpl(), llvm::EscapeEnumerator::Next(), performBlockTailMerging(), runImpl(), splitBasicBlock(), splitBasicBlockBefore(), llvm::splitBB(), llvm::SplitBlockAndInsertIfThenElse(), SplitBlockAndInsertIfThenImpl(), SplitBlockPredecessorsImpl(), llvm::SplitKnownCriticalEdge(), SplitLandingPadPredecessorsImpl(), splitRetconCoroutine(), llvm::JumpThreadingPass::threadEdge(), llvm::JumpThreadingPass::threadThroughTwoBasicBlocks(), and llvm::JumpThreadingPass::unfoldSelectInstr(). Definition at line 965 of file MachineBasicBlock.h. Referenced by llvm::FindAvailableLoadedValue(), findPotentialBlockers(), llvm::slpvectorizer::BoUpSLP::getSpillCost(), inlineRetainOrClaimRVCalls(), removeTriviallyEmptyRange(), and splitCallSite(). Definition at line 313 of file BasicBlock.h. References llvm::StringRef::equals(), llvm::Instruction::getMetadata(), llvm::MDString::getString(), and getTerminator(). Definition at line 309 of file BasicBlock.h. Definition at line 355 of file MachineBasicBlock.h. Definition at line 307 of file BasicBlock.cpp. Definition at line 35 of file BasicBlock.cpp. Definition at line 1427 of file MachineBasicBlock.cpp. Return true if there is exactly one use of this value. LLVM Basic Block Representation. Pseudo probes are like debug instructions which do not turn into real machine code. Definition at line 500 of file BasicBlock.h. Obtain the first basic block in a function. Definition at line 136 of file BasicBlock.cpp. References llvm::is_contained(), MBB, and predecessors(). Insert the given basic block after the insertion point of the given builder. Split the critical edge from this block to the given successor block, and return the newly created block, or null if splitting is not possible. References LLVMGetGlobalContext(), and LLVMInsertBasicBlockInContext(). There may be duplicates or overlapping registers in the list returned. A basic block is simply a container of instructions that execute sequentially. References BB, llvm::unwrap(), and llvm::wrap(). A basic block is simply a container of instructions that execute sequentially. Definition at line 940 of file MachineBasicBlock.h. A basic block is simply a 43 /// container of instructions that execute sequentially. Returns an iterator to the first instruction in this block that is not a PHINode, a debug intrinsic, a static alloca or any pseudo operation. Return the predecessor of this block if it has a unique predecessor block. Referenced by llvm::VETargetLowering::emitSjLjDispatchBlock(), and splitMBB(). This allows one to 'delete' a whole class at a time, even though there may be circular references first all references are dropped, and all use counts go to zero. Definition at line 325 of file MachineBasicBlock.h. Definition at line 163 of file BasicBlock.h. Definition at line 2736 of file Core.cpp. Definition at line 2701 of file Core.cpp. Replace successor OLD with NEW and update probability info. Definition at line 308 of file BasicBlock.h. Definition at line 163 of file BasicBlock.h. Return true if this basic block is an exception handling block. Update PHI nodes in this BasicBlock before removal of predecessor Pred. How do I print out an Instruction in LLVM? Definition at line 633 of file MachineBasicBlock.h. This represents a single basic block in LLVM. This method unlinks 'this' from the containing function and deletes it. Returns a pointer to the first instruction in this block that is not a, Returns an iterator to the first instruction in this block that is not a, Unlink this basic block from its current function and insert it into the function that, Unlink this basic block from its current function and insert it right after, Print the basic block to an output stream with an optional, Update all phi nodes in this basic block to refer to basic block, Update all phi nodes in this basic block's successors to refer to basic block, Support for debugging, callable in GDB: V->. References assert(), llvm::Function::getBasicBlockList(), and llvm::ilist_node_impl< OptionsT >::getIterator(). replaceUsesOutsideBlock - Go through the uses list for this definition and make each use point to "V" instead of "this" when the use is outside the block. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Renumber instructions and mark the ordering as valid. Definition at line 559 of file MachineBasicBlock.h. References end(), getFirstNonPHI(), and llvm::ilist_node_impl< OptionsT >::getIterator(). Referenced by analyzeAndPruneOutputBlocks(), llvm::CloneAndPruneIntoFromInst(), createSwitchStatement(), llvm::InlineFunction(), llvm::MergeBasicBlockIntoOnlyPred(), and GeneratedRTChecks::~GeneratedRTChecks(). Definition at line 881 of file MachineBasicBlock.cpp. Definition at line 870 of file MachineBasicBlock.h. Returns an alignment of the pointer value. Note that all instructions BEFORE the specified iterator stay as part of the original basic block, an unconditional branch is added to the original BB, and the rest of the instructions in the BB are moved to the new BB, including the old terminator. A well formed basic block is formed of a list of . Basic blocks are themselves values. Funclets use this to prevent register allocation across funclet transitions. Returns a pointer to the first instruction in this block that is not a PHINode instruction. Referenced by areInnerLoopLatchPHIsSupported(), areOuterLoopExitPHIsSupported(), llvm::MustBeExecutedContextExplorer::findBackwardJoinPoint(), findLocationForEntrySafepoint(), llvm::Loop::getLoopGuardBranch(), getUniquePredecessor(), IsAcceptableTarget(), makeStatepointExplicitImpl(), llvm::MergeBlockSuccessorsIntoGivenBlocks(), optimizeDivRem(), reuseTableCompare(), llvm::InstCombinerImpl::run(), TryToSinkInstruction(), and llvm::UnrollLoop(). If InsertBefore is provided, inserts before that basic block, otherwise inserts at the end. When adding instruction to the beginning of the basic block, they should be added before the returned value, not before the first instruction, which might be PHI. Basic blocks belong to functions. Accumulate the constant offset this value has compared to a base pointer. Note that this may be NULL if this instance does not correspond directly to an LLVM basic block. Return the underlying instruction list container. References addSuccessor(), addSuccessorWithoutProb(), normalizeSuccProbs(), removeSuccessor(), replacePhiUsesWith(), succ_begin(), and succ_empty(). Indicates if this is the entry block of an EH funclet. The BasicBlock class allows malformed basic blocks to occur because it may be useful in the intermediate stage of constructing or modifying a program. Definition at line 576 of file MachineBasicBlock.h. command. Split the containing block at the specified instruction - everything before SplitBefore stays in the old basic block, and the rest of the instructions in the BB are moved to a new block. References liveout_begin(), liveout_end(), and llvm::make_range(). This function invalidates the specified iterator. Has exact same behavior as findPrevDebugLoc (it also searches from the last to the first MI of this MBB) except that this takes reverse iterator. Definition at line 295 of file MachineBasicBlock.h. Referenced by llvm::ConstantFoldTerminator(), getFirstNonPHIOrDbg(), initializeUniqueCases(), llvm::SimpleLoopSafetyInfo::isGuaranteedToExecute(), isPredicatedOnPHI(), llvm::moveInstructionsToTheBeginning(), and llvm::InstCombinerImpl::visitAllocaInst(). More. Definition at line 88 of file BasicBlock.h. References assert(), llvm::Instruction::comesBefore(), I, and isInstrOrderValid(). References F, llvm::MachineFunction::getFunction(), getParent(), llvm::ModuleSlotTracker::incorporateFunction(), and M. Referenced by dump(), llvm::operator<<(), llvm::MachineInstr::print(), and llvm::PeelingModuloScheduleExpander::validateAgainstModuloScheduleExpander(). Definition at line 385 of file BasicBlock.h. Returns true if it is legal to hoist instructions into this block. 1 Answer Sorted by: 2 You can use an IRBuilder like this: llvm::IRBuilder builder (basicBlock); builder.createAdd (. Copy a successor (and any probability info) from original block to this block's. Terminator instructions may not occur in the middle of basic blocks, and must terminate the blocks. References end(), getFirstNonPHI(), and llvm::ilist_node_impl< OptionsT >::getIterator(). Returns a pointer to the first instruction in this block that is not a PHINode, a debug intrinsic, or a lifetime intrinsic, or any pseudo operation if SkipPseudoOp is true. Strip off pointer casts and inbounds GEPs. If KeepOneInputPHIs is true then don't remove PHIs that are left with zero or one incoming values, and don't simplify PHIs with all incoming values the same. Definition at line 505 of file BasicBlock.cpp. Basic blocks are Values because they are referenced by instructions such as branches and switch tables. Take an instruction from MBB 'Other' at the position From, and insert it into this MBB right before 'Where'. References E, llvm::pred_begin(), and llvm::pred_end(). References assert(), begin(), empty(), front(), llvm::Value::hasNUsesOrMore(), llvm::is_contained(), llvm::make_early_inc_range(), phis(), and llvm::predecessors(). Definition at line 330 of file MachineBasicBlock.cpp. This method can only be used on blocks that have a parent function. References BB, llvm::BasicBlock::Create(), llvm::unwrap(), and llvm::wrap(). This method computes the number of uses of this. Return true if this block has N predecessors or more. Referenced by llvm::ARMBlockPlacement::fixBackwardsWLS(), llvm::ScheduleDAGSDNodes::getDAGName(), and verifyCTRBranch(). Instruction * getInsertionPointAfterDef Get the first insertion point at which the result of this instruction is defined. References begin(), end(), and instructionsWithoutDebug(). Referenced by getLandingPadInst(), makeStatepointExplicitImpl(), and SplitLandingPadPredecessorsImpl(). Insert MI into the instruction list before I, possibly inside a bundle. Every instruction has to be part of a basic block by definition. Returns true if this is the entry block of an EH scope, i.e., the block that used to have a catchpad or cleanuppad instruction in the LLVM IR. This method unlinks 'this' from the containing function, and deletes it. Definition at line 369 of file MachineBasicBlock.h. Definition at line 619 of file MachineBasicBlock.h. References llvm::BranchProbability::normalizeProbabilities(). Definition at line 230 of file BasicBlock.cpp. If NormalizeSuccProbs is true, then normalize successors' probabilities after the successor is removed. Definition at line 621 of file MachineBasicBlock.h. Definition at line 524 of file BasicBlock.cpp. Definition at line 1001 of file MachineBasicBlock.h. Inserting a new llvm instruction to a non empty basic block Add PhysReg as live in to this block, and ensure that there is a copy of PhysReg to a virtual register of class RC. Definition at line 810 of file MachineBasicBlock.h. References getFirstNonPHIOrDbgOrAlloca(). Definition at line 364 of file BasicBlock.h. Return true if there is a value handle associated with this value. Register liveness not decidable from local neighborhood. Referenced by llvm::FindAvailableLoadedValue(), findPotentialBlockers(), llvm::slpvectorizer::BoUpSLP::getSpillCost(), inlineRetainOrClaimRVCalls(), removeTriviallyEmptyRange(), and splitCallSite(). Return the first instruction in MBB after I that is not a PHI or a label. Referenced by canSplitCallSite(), llvm::JumpThreadingPass::maybethreadThroughTwoBasicBlocks(), llvm::JumpThreadingPass::simplifyPartiallyRedundantLoad(), llvm::SplitEdge(), and llvm::SplitKnownCriticalEdge(). Return a formatted string to identify this block and its parent function. Return the size of the basic block ignoring debug instructions. Returns an iterator to the first non-debug instruction in the basic block, or end(). Referenced by llvm::CanonicalLoopInfo::assertOK(), llvm::CanonicalLoopInfo::getAfter(), getSingleSuccessor(), insertSpills(), llvm::isProfitableToTransform(), mergeBlocksIntoPredecessors(), mergeConditionalStores(), optimizeDivRem(), sinkLifetimeStartMarkers(), and llvm::UnrollRuntimeLoopRemainder(). References begin(), end(), and instructionsWithoutDebug(). Return the predecessor of this block if it has a single predecessor block. This should return null if it can reach the block after it, but it uses an explicit branch to do so (e.g., a table jump). /// container of instructions that execute sequentially. Definition at line 311 of file BasicBlock.cpp. This method is analogous to getSinglePredecessor above. Note that all instructions BEFORE the specified iterator stay as part of the original basic block, an unconditional branch is added to the original BB, and the rest of the instructions in the BB are moved to the new BB, including the old terminator. Return the enclosing method, or null if none. Definition at line 320 of file BasicBlock.h. The default value of SkipPseudoOp is set to true to maximize code quality in general, with an explict false value passed in in a few places like branch folding and if-conversion to favor profile quality. Return the fallthrough block if the block can implicitly transfer control to the block after it by falling off the end of it. Definition at line 540 of file BasicBlock.cpp. Definition at line 262 of file MachineBasicBlock.h. Referenced by llvm::Instruction::comesBefore(). Without, where %esp offset is used when frame pointer is omitted. Split the basic block into two basic blocks at the specified instruction. Return true if there is exactly one unique user of this value that cannot be dropped (that user can have multiple uses of this value). Definition at line 1604 of file MachineBasicBlock.cpp. References assert(), llvm::Instruction::comesBefore(), I, and isInstrOrderValid(). Definition at line 902 of file MachineBasicBlock.h. This deletes the basic block from its containing function but keep the basic block alive. Definition at line 287 of file MachineBasicBlock.h. July 11, 2018 | 7 Minute Read. Definition at line 371 of file BasicBlock.cpp. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Referenced by llvm::MipsInstrInfo::analyzeBranch(), llvm::M68kInstrInfo::AnalyzeBranchImpl(), dominatesAllUsesOf(), FindLastAluClause(), llvm::findPHICopyInsertPoint(), llvm::ARMBaseInstrInfo::isMBBSafeToOutlineFrom(), llvm::ARMBaseInstrInfo::isProfitableToIfCvt(), mergeOperations(), llvm::X86InstrInfo::optimizeCompareInstr(), llvm::MipsInstrInfo::removeBranch(), splitAt(), and verifySameBranchInstructions(). Block hashing seems useful. The {ir-name} is only printed when the PrintNameIr flag is passed (which is the default). All values hold a context through their type. Definition at line 493 of file BasicBlock.cpp. If the Parent parameter is specified, the basic block is automatically inserted at either the end of the function (if InsertBefore is 0), or before the specified basic block. Definition at line 119 of file BasicBlock.h. Split the basic block into two basic blocks at the specified instruction and insert the new basic blocks as the predecessor of the current block. Connect and share knowledge within a single location that is structured and easy to search. Referenced by llvm::LiveVariables::addNewBlock(), assignSections(), llvm::SwitchCG::SwitchLowering::buildBitTests(), llvm::LiveIntervals::checkRegMaskInterference(), llvm::ARMBasicBlockUtils::computeBlockSize(), llvm::AMDGPUAsmPrinter::emitBasicBlockStart(), llvm::AsmPrinter::emitBasicBlockStart(), llvm::AsmPrinter::emitJumpTableInfo(), llvm::SwitchCG::SwitchLowering::findBitTestClusters(), for(), llvm::WebAssembly::SortRegionInfo::getBottom(), llvm::MachineTraceMetrics::Ensemble::getDepthResources(), getEHCatchretSymbol(), llvm::getEHScopeMembership(), getEndSymbol(), getFullName(), llvm::MachineTraceMetrics::Ensemble::getHeightResources(), getMCSymbolForMBB(), llvm::ARMBasicBlockUtils::getOffsetOf(), llvm::MachineTraceMetrics::Trace::getResourceLength(), llvm::MachineTraceMetrics::getResources(), getSymbol(), llvm::MachineTraceMetrics::Ensemble::getTrace(), llvm::LiveVariables::HandleVirtRegUse(), llvm::po_iterator_storage< LoopBounds, true >::insertEdge(), llvm::SlotIndexes::insertMBBInMaps(), llvm::MachineTraceMetrics::Ensemble::invalidate(), llvm::MachineTraceMetrics::invalidate(), llvm::ARMBasicBlockUtils::isBBInRange(), llvm::LiveRangeCalc::isJointlyDominated(), llvm::LiveVariables::VarInfo::isLiveIn(), TransferTracker::loadVarInloc(), llvm::LiveVariables::MarkVirtRegAliveInBlock(), maybeUpdateTerminator(), llvm::WebAssemblyException::print(), llvm::MIPrinter::print(), llvm::CSKYConstantPoolMBB::print(), printName(), llvm::WebAssemblyExceptionInfo::recalculate(), llvm::LiveVariables::recomputeForSingleDefVirtReg(), llvm::MachineFunction::RenumberBlocks(), llvm::CFIFixup::runOnMachineFunction(), llvm::SlotIndexes::runOnMachineFunction(), llvm::MIRProfileLoader::setBranchProbs(), llvm::sortBasicBlocksAndUpdateBranches(), sortBlocks(), llvm::MachineTraceMetrics::Ensemble::updateDepth(), llvm::MachineTraceMetrics::Ensemble::verify(), VerifyPHIs(), llvm::yaml::WebAssemblyFunctionInfo::WebAssemblyFunctionInfo(), and llvm::WriteGraph(). The first test now explicitly checks both to clear any ambiguity here. Test whether this block is used as something other than the target of a terminator, exception-handling target, jump table, or IR blockaddress. Return true if this value is a swifterror value. Return true if the specified register is in the live in set. PHI nodes must be the first thing in a basic block, all grouped together. Definition at line 485 of file BasicBlock.h. Referenced by llvm::FunctionComparator::cmpBasicBlocks(), llvm::OpenMPIRBuilder::createParallel(), llvm::OpenMPIRBuilder::createReductions(), createSwitchStatement(), detectPopcountIdiom(), detectShiftUntilZeroIdiom(), findDependencies(), getFirstInsertionPt(), getFirstNonPHIOrDbgOrAlloca(), llvm::Instruction::getInsertionPointAfterDef(), llvm::CanonicalLoopInfo::getPreheaderIP(), llvm::insertDebugValuesForPHIs(), InsertSafepointPoll(), instrumentOneFunc(), llvm::RecurrenceDescriptor::isFixedOrderRecurrence(), llvm::isInTailCallPosition(), isSafeAndProfitableToSinkLoad(), LLVMGetNextInstruction(), llvm::MergeBlockIntoPredecessor(), mergeConditionalStoreToAddress(), moveBBContents(), OptimizeExtractBits(), reconnectPhis(), RewriteUsesOfClonedInstructions(), llvm::IRBuilderBase::SetInsertPoint(), llvm::JumpThreadingPass::simplifyPartiallyRedundantLoad(), SinkCast(), sinkCmpExpression(), SinkShiftAndTruncate(), sizeWithoutDebug(), llvm::spliceBB(), llvm::VPBasicBlock::splitAt(), splitBasicBlock(), SplitBlockImpl(), llvm::JumpThreadingPass::threadThroughTwoBasicBlocks(), llvm::JumpThreadingPass::unfoldSelectInstr(), unswitchTrivialBranch(), and llvm::InstCombinerImpl::visitPHINode().
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