//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "function-lowering-info"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/DataLayout.h"
-#include "llvm/DebugInfo.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Function.h"
-#include "llvm/Instructions.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/LLVMContext.h"
-#include "llvm/Module.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DebugInfo.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
#include <algorithm>
using namespace llvm;
+#define DEBUG_TYPE "function-lowering-info"
+
/// isUsedOutsideOfDefiningBlock - Return true if this instruction is used by
/// PHI nodes or outside of the basic block that defines it, or used by a
/// switch or atomic instruction, which may expand to multiple basic blocks.
if (I->use_empty()) return false;
if (isa<PHINode>(I)) return true;
const BasicBlock *BB = I->getParent();
- for (Value::const_use_iterator UI = I->use_begin(), E = I->use_end();
- UI != E; ++UI) {
- const User *U = *UI;
+ for (const User *U : I->users())
if (cast<Instruction>(U)->getParent() != BB || isa<PHINode>(U))
return true;
- }
+
return false;
}
-FunctionLoweringInfo::FunctionLoweringInfo(const TargetLowering &tli)
- : TLI(tli) {
+static ISD::NodeType getPreferredExtendForValue(const Value *V) {
+ // For the users of the source value being used for compare instruction, if
+ // the number of signed predicate is greater than unsigned predicate, we
+ // prefer to use SIGN_EXTEND.
+ //
+ // With this optimization, we would be able to reduce some redundant sign or
+ // zero extension instruction, and eventually more machine CSE opportunities
+ // can be exposed.
+ ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
+ unsigned NumOfSigned = 0, NumOfUnsigned = 0;
+ for (const User *U : V->users()) {
+ if (const auto *CI = dyn_cast<CmpInst>(U)) {
+ NumOfSigned += CI->isSigned();
+ NumOfUnsigned += CI->isUnsigned();
+ }
+ }
+ if (NumOfSigned > NumOfUnsigned)
+ ExtendKind = ISD::SIGN_EXTEND;
+
+ return ExtendKind;
}
-void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf) {
+void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
+ SelectionDAG *DAG) {
Fn = &fn;
MF = &mf;
+ TLI = MF->getSubtarget().getTargetLowering();
RegInfo = &MF->getRegInfo();
// Check whether the function can return without sret-demotion.
SmallVector<ISD::OutputArg, 4> Outs;
- GetReturnInfo(Fn->getReturnType(),
- Fn->getAttributes().getRetAttributes(), Outs, TLI);
- CanLowerReturn = TLI.CanLowerReturn(Fn->getCallingConv(), *MF,
- Fn->isVarArg(),
- Outs, Fn->getContext());
+ GetReturnInfo(Fn->getReturnType(), Fn->getAttributes(), Outs, *TLI);
+ CanLowerReturn = TLI->CanLowerReturn(Fn->getCallingConv(), *MF,
+ Fn->isVarArg(), Outs, Fn->getContext());
// Initialize the mapping of values to registers. This is only set up for
// instruction values that are used outside of the block that defines
// them.
Function::const_iterator BB = Fn->begin(), EB = Fn->end();
- for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I != E; ++I)
- if (const AllocaInst *AI = dyn_cast<AllocaInst>(I))
- if (const ConstantInt *CUI = dyn_cast<ConstantInt>(AI->getArraySize())) {
- Type *Ty = AI->getAllocatedType();
- uint64_t TySize = TLI.getDataLayout()->getTypeAllocSize(Ty);
- unsigned Align =
- std::max((unsigned)TLI.getDataLayout()->getPrefTypeAlignment(Ty),
- AI->getAlignment());
-
- TySize *= CUI->getZExtValue(); // Get total allocated size.
- if (TySize == 0) TySize = 1; // Don't create zero-sized stack objects.
-
- // The object may need to be placed onto the stack near the stack
- // protector if one exists. Determine here if this object is a suitable
- // candidate. I.e., it would trigger the creation of a stack protector.
- bool MayNeedSP =
- (AI->isArrayAllocation() ||
- (TySize >= 8 && isa<ArrayType>(Ty) &&
- cast<ArrayType>(Ty)->getElementType()->isIntegerTy(8)));
- StaticAllocaMap[AI] =
- MF->getFrameInfo()->CreateStackObject(TySize, Align, false,
- MayNeedSP, AI);
- }
-
for (; BB != EB; ++BB)
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
I != E; ++I) {
+ if (const AllocaInst *AI = dyn_cast<AllocaInst>(I)) {
+ // Static allocas can be folded into the initial stack frame adjustment.
+ if (AI->isStaticAlloca()) {
+ const ConstantInt *CUI = cast<ConstantInt>(AI->getArraySize());
+ Type *Ty = AI->getAllocatedType();
+ uint64_t TySize = TLI->getDataLayout()->getTypeAllocSize(Ty);
+ unsigned Align =
+ std::max((unsigned)TLI->getDataLayout()->getPrefTypeAlignment(Ty),
+ AI->getAlignment());
+
+ TySize *= CUI->getZExtValue(); // Get total allocated size.
+ if (TySize == 0) TySize = 1; // Don't create zero-sized stack objects.
+
+ StaticAllocaMap[AI] =
+ MF->getFrameInfo()->CreateStackObject(TySize, Align, false, AI);
+
+ } else {
+ unsigned Align = std::max(
+ (unsigned)TLI->getDataLayout()->getPrefTypeAlignment(
+ AI->getAllocatedType()),
+ AI->getAlignment());
+ unsigned StackAlign =
+ MF->getSubtarget().getFrameLowering()->getStackAlignment();
+ if (Align <= StackAlign)
+ Align = 0;
+ // Inform the Frame Information that we have variable-sized objects.
+ MF->getFrameInfo()->CreateVariableSizedObject(Align ? Align : 1, AI);
+ }
+ }
+
+ // Look for inline asm that clobbers the SP register.
+ if (isa<CallInst>(I) || isa<InvokeInst>(I)) {
+ ImmutableCallSite CS(I);
+ if (isa<InlineAsm>(CS.getCalledValue())) {
+ unsigned SP = TLI->getStackPointerRegisterToSaveRestore();
+ const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
+ std::vector<TargetLowering::AsmOperandInfo> Ops =
+ TLI->ParseConstraints(TRI, CS);
+ for (size_t I = 0, E = Ops.size(); I != E; ++I) {
+ TargetLowering::AsmOperandInfo &Op = Ops[I];
+ if (Op.Type == InlineAsm::isClobber) {
+ // Clobbers don't have SDValue operands, hence SDValue().
+ TLI->ComputeConstraintToUse(Op, SDValue(), DAG);
+ std::pair<unsigned, const TargetRegisterClass *> PhysReg =
+ TLI->getRegForInlineAsmConstraint(TRI, Op.ConstraintCode,
+ Op.ConstraintVT);
+ if (PhysReg.first == SP)
+ MF->getFrameInfo()->setHasInlineAsmWithSPAdjust(true);
+ }
+ }
+ }
+ }
+
+ // Look for calls to the @llvm.va_start intrinsic. We can omit some
+ // prologue boilerplate for variadic functions that don't examine their
+ // arguments.
+ if (const auto *II = dyn_cast<IntrinsicInst>(I)) {
+ if (II->getIntrinsicID() == Intrinsic::vastart)
+ MF->getFrameInfo()->setHasVAStart(true);
+ }
+
+ // If we have a musttail call in a variadic funciton, we need to ensure we
+ // forward implicit register parameters.
+ if (const auto *CI = dyn_cast<CallInst>(I)) {
+ if (CI->isMustTailCall() && Fn->isVarArg())
+ MF->getFrameInfo()->setHasMustTailInVarArgFunc(true);
+ }
+
// Mark values used outside their block as exported, by allocating
// a virtual register for them.
if (isUsedOutsideOfDefiningBlock(I))
// in a predictable order.
if (const DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(I)) {
MachineModuleInfo &MMI = MF->getMMI();
+ DIVariable DIVar(DI->getVariable());
+ assert((!DIVar || DIVar.isVariable()) &&
+ "Variable in DbgDeclareInst should be either null or a DIVariable.");
if (MMI.hasDebugInfo() &&
- DIVariable(DI->getVariable()).Verify() &&
+ DIVar &&
!DI->getDebugLoc().isUnknown()) {
// Don't handle byval struct arguments or VLAs, for example.
// Non-byval arguments are handled here (they refer to the stack
StaticAllocaMap.find(AI);
if (SI != StaticAllocaMap.end()) { // Check for VLAs.
int FI = SI->second;
- MMI.setVariableDbgInfo(DI->getVariable(),
+ MMI.setVariableDbgInfo(DI->getVariable(), DI->getExpression(),
FI, DI->getDebugLoc());
}
}
}
}
}
+
+ // Decide the preferred extend type for a value.
+ PreferredExtendType[I] = getPreferredExtendForValue(I);
}
// Create an initial MachineBasicBlock for each LLVM BasicBlock in F. This
assert(PHIReg && "PHI node does not have an assigned virtual register!");
SmallVector<EVT, 4> ValueVTs;
- ComputeValueVTs(TLI, PN->getType(), ValueVTs);
+ ComputeValueVTs(*TLI, PN->getType(), ValueVTs);
for (unsigned vti = 0, vte = ValueVTs.size(); vti != vte; ++vti) {
EVT VT = ValueVTs[vti];
- unsigned NumRegisters = TLI.getNumRegisters(Fn->getContext(), VT);
- const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
+ unsigned NumRegisters = TLI->getNumRegisters(Fn->getContext(), VT);
+ const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
for (unsigned i = 0; i != NumRegisters; ++i)
BuildMI(MBB, DL, TII->get(TargetOpcode::PHI), PHIReg + i);
PHIReg += NumRegisters;
ArgDbgValues.clear();
ByValArgFrameIndexMap.clear();
RegFixups.clear();
+ StatepointStackSlots.clear();
+ PreferredExtendType.clear();
}
/// CreateReg - Allocate a single virtual register for the given type.
unsigned FunctionLoweringInfo::CreateReg(MVT VT) {
- return RegInfo->createVirtualRegister(TLI.getRegClassFor(VT));
+ return RegInfo->createVirtualRegister(
+ MF->getSubtarget().getTargetLowering()->getRegClassFor(VT));
}
/// CreateRegs - Allocate the appropriate number of virtual registers of
/// will assign registers for each member or element.
///
unsigned FunctionLoweringInfo::CreateRegs(Type *Ty) {
+ const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
+
SmallVector<EVT, 4> ValueVTs;
- ComputeValueVTs(TLI, Ty, ValueVTs);
+ ComputeValueVTs(*TLI, Ty, ValueVTs);
unsigned FirstReg = 0;
for (unsigned Value = 0, e = ValueVTs.size(); Value != e; ++Value) {
EVT ValueVT = ValueVTs[Value];
- MVT RegisterVT = TLI.getRegisterType(Ty->getContext(), ValueVT);
+ MVT RegisterVT = TLI->getRegisterType(Ty->getContext(), ValueVT);
- unsigned NumRegs = TLI.getNumRegisters(Ty->getContext(), ValueVT);
+ unsigned NumRegs = TLI->getNumRegisters(Ty->getContext(), ValueVT);
for (unsigned i = 0; i != NumRegs; ++i) {
unsigned R = CreateReg(RegisterVT);
if (!FirstReg) FirstReg = R;
const FunctionLoweringInfo::LiveOutInfo *
FunctionLoweringInfo::GetLiveOutRegInfo(unsigned Reg, unsigned BitWidth) {
if (!LiveOutRegInfo.inBounds(Reg))
- return NULL;
+ return nullptr;
LiveOutInfo *LOI = &LiveOutRegInfo[Reg];
if (!LOI->IsValid)
- return NULL;
+ return nullptr;
if (BitWidth > LOI->KnownZero.getBitWidth()) {
LOI->NumSignBits = 1;
return;
SmallVector<EVT, 1> ValueVTs;
- ComputeValueVTs(TLI, Ty, ValueVTs);
+ ComputeValueVTs(*TLI, Ty, ValueVTs);
assert(ValueVTs.size() == 1 &&
"PHIs with non-vector integer types should have a single VT.");
EVT IntVT = ValueVTs[0];
- if (TLI.getNumRegisters(PN->getContext(), IntVT) != 1)
+ if (TLI->getNumRegisters(PN->getContext(), IntVT) != 1)
return;
- IntVT = TLI.getTypeToTransformTo(PN->getContext(), IntVT);
+ IntVT = TLI->getTypeToTransformTo(PN->getContext(), IntVT);
unsigned BitWidth = IntVT.getSizeInBits();
unsigned DestReg = ValueMap[PN];
}
}
-/// AddCatchInfo - Extract the personality and type infos from an eh.selector
-/// call, and add them to the specified machine basic block.
-void llvm::AddCatchInfo(const CallInst &I, MachineModuleInfo *MMI,
- MachineBasicBlock *MBB) {
- // Inform the MachineModuleInfo of the personality for this landing pad.
- const ConstantExpr *CE = cast<ConstantExpr>(I.getArgOperand(1));
- assert(CE->getOpcode() == Instruction::BitCast &&
- isa<Function>(CE->getOperand(0)) &&
- "Personality should be a function");
- MMI->addPersonality(MBB, cast<Function>(CE->getOperand(0)));
-
- // Gather all the type infos for this landing pad and pass them along to
- // MachineModuleInfo.
- std::vector<const GlobalVariable *> TyInfo;
- unsigned N = I.getNumArgOperands();
-
- for (unsigned i = N - 1; i > 1; --i) {
- if (const ConstantInt *CI = dyn_cast<ConstantInt>(I.getArgOperand(i))) {
- unsigned FilterLength = CI->getZExtValue();
- unsigned FirstCatch = i + FilterLength + !FilterLength;
- assert(FirstCatch <= N && "Invalid filter length");
-
- if (FirstCatch < N) {
- TyInfo.reserve(N - FirstCatch);
- for (unsigned j = FirstCatch; j < N; ++j)
- TyInfo.push_back(ExtractTypeInfo(I.getArgOperand(j)));
- MMI->addCatchTypeInfo(MBB, TyInfo);
- TyInfo.clear();
- }
-
- if (!FilterLength) {
- // Cleanup.
- MMI->addCleanup(MBB);
- } else {
- // Filter.
- TyInfo.reserve(FilterLength - 1);
- for (unsigned j = i + 1; j < FirstCatch; ++j)
- TyInfo.push_back(ExtractTypeInfo(I.getArgOperand(j)));
- MMI->addFilterTypeInfo(MBB, TyInfo);
- TyInfo.clear();
- }
-
- N = i;
- }
- }
-
- if (N > 2) {
- TyInfo.reserve(N - 2);
- for (unsigned j = 2; j < N; ++j)
- TyInfo.push_back(ExtractTypeInfo(I.getArgOperand(j)));
- MMI->addCatchTypeInfo(MBB, TyInfo);
- }
-}
-
/// AddLandingPadInfo - Extract the exception handling information from the
/// landingpad instruction and add them to the specified machine module info.
void llvm::AddLandingPadInfo(const LandingPadInst &I, MachineModuleInfo &MMI,
Value *Val = I.getClause(i - 1);
if (I.isCatch(i - 1)) {
MMI.addCatchTypeInfo(MBB,
- dyn_cast<GlobalVariable>(Val->stripPointerCasts()));
+ dyn_cast<GlobalValue>(Val->stripPointerCasts()));
} else {
// Add filters in a list.
Constant *CVal = cast<Constant>(Val);
- SmallVector<const GlobalVariable*, 4> FilterList;
+ SmallVector<const GlobalValue*, 4> FilterList;
for (User::op_iterator
II = CVal->op_begin(), IE = CVal->op_end(); II != IE; ++II)
- FilterList.push_back(cast<GlobalVariable>((*II)->stripPointerCasts()));
+ FilterList.push_back(cast<GlobalValue>((*II)->stripPointerCasts()));
MMI.addFilterTypeInfo(MBB, FilterList);
}
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