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//===-- llvm/Target/TargetLowering.h - Target Lowering Info -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file describes how to lower LLVM code to machine code. This has two
/// main components:
///
/// 1. Which ValueTypes are natively supported by the target.
/// 2. Which operations are supported for supported ValueTypes.
/// 3. Cost thresholds for alternative implementations of certain operations.
///
/// In addition it has a few other components, like information about FP
/// immediates.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETLOWERING_H
#define LLVM_TARGET_TARGETLOWERING_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/DAGCombine.h"
#include "llvm/CodeGen/RuntimeLibcalls.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instructions.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Target/TargetCallingConv.h"
#include "llvm/Target/TargetMachine.h"
#include <climits>
#include <map>
#include <vector>
namespace llvm {
class CallInst;
class CCState;
class FastISel;
class FunctionLoweringInfo;
class ImmutableCallSite;
class IntrinsicInst;
class MachineBasicBlock;
class MachineFunction;
class MachineInstr;
class MachineJumpTableInfo;
class MachineLoop;
class Mangler;
class MCContext;
class MCExpr;
class MCSymbol;
template<typename T> class SmallVectorImpl;
class DataLayout;
class TargetRegisterClass;
class TargetLibraryInfo;
class TargetLoweringObjectFile;
class Value;
namespace Sched {
enum Preference {
None, // No preference
Source, // Follow source order.
RegPressure, // Scheduling for lowest register pressure.
Hybrid, // Scheduling for both latency and register pressure.
ILP, // Scheduling for ILP in low register pressure mode.
VLIW // Scheduling for VLIW targets.
};
}
/// This base class for TargetLowering contains the SelectionDAG-independent
/// parts that can be used from the rest of CodeGen.
class TargetLoweringBase {
TargetLoweringBase(const TargetLoweringBase&) = delete;
void operator=(const TargetLoweringBase&) = delete;
public:
/// This enum indicates whether operations are valid for a target, and if not,
/// what action should be used to make them valid.
enum LegalizeAction {
Legal, // The target natively supports this operation.
Promote, // This operation should be executed in a larger type.
Expand, // Try to expand this to other ops, otherwise use a libcall.
Custom // Use the LowerOperation hook to implement custom lowering.
};
/// This enum indicates whether a types are legal for a target, and if not,
/// what action should be used to make them valid.
enum LegalizeTypeAction {
TypeLegal, // The target natively supports this type.
TypePromoteInteger, // Replace this integer with a larger one.
TypeExpandInteger, // Split this integer into two of half the size.
TypeSoftenFloat, // Convert this float to a same size integer type.
TypeExpandFloat, // Split this float into two of half the size.
TypeScalarizeVector, // Replace this one-element vector with its element.
TypeSplitVector, // Split this vector into two of half the size.
TypeWidenVector, // This vector should be widened into a larger vector.
TypePromoteFloat // Replace this float with a larger one.
};
/// LegalizeKind holds the legalization kind that needs to happen to EVT
/// in order to type-legalize it.
typedef std::pair<LegalizeTypeAction, EVT> LegalizeKind;
/// Enum that describes how the target represents true/false values.
enum BooleanContent {
UndefinedBooleanContent, // Only bit 0 counts, the rest can hold garbage.
ZeroOrOneBooleanContent, // All bits zero except for bit 0.
ZeroOrNegativeOneBooleanContent // All bits equal to bit 0.
};
/// Enum that describes what type of support for selects the target has.
enum SelectSupportKind {
ScalarValSelect, // The target supports scalar selects (ex: cmov).
ScalarCondVectorVal, // The target supports selects with a scalar condition
// and vector values (ex: cmov).
VectorMaskSelect // The target supports vector selects with a vector
// mask (ex: x86 blends).
};
/// Enum that specifies what a AtomicRMWInst is expanded to, if at all. Exists
/// because different targets have different levels of support for these
/// atomic RMW instructions, and also have different options w.r.t. what they should
/// expand to.
enum class AtomicRMWExpansionKind {
None, // Don't expand the instruction.
LLSC, // Expand the instruction into loadlinked/storeconditional; used
// by ARM/AArch64. Implies `hasLoadLinkedStoreConditional`
// returns true.
CmpXChg, // Expand the instruction into cmpxchg; used by at least X86.
};
static ISD::NodeType getExtendForContent(BooleanContent Content) {
switch (Content) {
case UndefinedBooleanContent:
// Extend by adding rubbish bits.
return ISD::ANY_EXTEND;
case ZeroOrOneBooleanContent:
// Extend by adding zero bits.
return ISD::ZERO_EXTEND;
case ZeroOrNegativeOneBooleanContent:
// Extend by copying the sign bit.
return ISD::SIGN_EXTEND;
}
llvm_unreachable("Invalid content kind");
}
/// NOTE: The TargetMachine owns TLOF.
explicit TargetLoweringBase(const TargetMachine &TM);
virtual ~TargetLoweringBase() {}
protected:
/// \brief Initialize all of the actions to default values.
void initActions();
public:
const TargetMachine &getTargetMachine() const { return TM; }
const DataLayout *getDataLayout() const { return TM.getDataLayout(); }
bool isBigEndian() const { return !IsLittleEndian; }
bool isLittleEndian() const { return IsLittleEndian; }
/// Return the pointer type for the given address space, defaults to
/// the pointer type from the data layout.
/// FIXME: The default needs to be removed once all the code is updated.
virtual MVT getPointerTy(uint32_t /*AS*/ = 0) const;
unsigned getPointerSizeInBits(uint32_t AS = 0) const;
unsigned getPointerTypeSizeInBits(Type *Ty) const;
virtual MVT getScalarShiftAmountTy(EVT LHSTy) const;
EVT getShiftAmountTy(EVT LHSTy) const;
/// Returns the type to be used for the index operand of:
/// ISD::INSERT_VECTOR_ELT, ISD::EXTRACT_VECTOR_ELT,
/// ISD::INSERT_SUBVECTOR, and ISD::EXTRACT_SUBVECTOR
virtual MVT getVectorIdxTy() const {
return getPointerTy();
}
/// Return true if the select operation is expensive for this target.
bool isSelectExpensive() const { return SelectIsExpensive; }
virtual bool isSelectSupported(SelectSupportKind /*kind*/) const {
return true;
}
/// Return true if multiple condition registers are available.
bool hasMultipleConditionRegisters() const {
return HasMultipleConditionRegisters;
}
/// Return true if the target has BitExtract instructions.
bool hasExtractBitsInsn() const { return HasExtractBitsInsn; }
/// Return the preferred vector type legalization action.
virtual TargetLoweringBase::LegalizeTypeAction
getPreferredVectorAction(EVT VT) const {
// The default action for one element vectors is to scalarize
if (VT.getVectorNumElements() == 1)
return TypeScalarizeVector;
// The default action for other vectors is to promote
return TypePromoteInteger;
}
// There are two general methods for expanding a BUILD_VECTOR node:
// 1. Use SCALAR_TO_VECTOR on the defined scalar values and then shuffle
// them together.
// 2. Build the vector on the stack and then load it.
// If this function returns true, then method (1) will be used, subject to
// the constraint that all of the necessary shuffles are legal (as determined
// by isShuffleMaskLegal). If this function returns false, then method (2) is
// always used. The vector type, and the number of defined values, are
// provided.
virtual bool
shouldExpandBuildVectorWithShuffles(EVT /* VT */,
unsigned DefinedValues) const {
return DefinedValues < 3;
}
/// Return true if integer divide is usually cheaper than a sequence of
/// several shifts, adds, and multiplies for this target.
bool isIntDivCheap() const { return IntDivIsCheap; }
/// Return true if sqrt(x) is as cheap or cheaper than 1 / rsqrt(x)
bool isFsqrtCheap() const {
return FsqrtIsCheap;
}
/// Returns true if target has indicated at least one type should be bypassed.
bool isSlowDivBypassed() const { return !BypassSlowDivWidths.empty(); }
/// Returns map of slow types for division or remainder with corresponding
/// fast types
const DenseMap<unsigned int, unsigned int> &getBypassSlowDivWidths() const {
return BypassSlowDivWidths;
}
/// Return true if pow2 sdiv is cheaper than a chain of sra/srl/add/sra.
bool isPow2SDivCheap() const { return Pow2SDivIsCheap; }
/// Return true if Flow Control is an expensive operation that should be
/// avoided.
bool isJumpExpensive() const { return JumpIsExpensive; }
/// Return true if selects are only cheaper than branches if the branch is
/// unlikely to be predicted right.
bool isPredictableSelectExpensive() const {
return PredictableSelectIsExpensive;
}
/// isLoadBitCastBeneficial() - Return true if the following transform
/// is beneficial.
/// fold (conv (load x)) -> (load (conv*)x)
/// On architectures that don't natively support some vector loads efficiently,
/// casting the load to a smaller vector of larger types and loading
/// is more efficient, however, this can be undone by optimizations in
/// dag combiner.
virtual bool isLoadBitCastBeneficial(EVT /* Load */, EVT /* Bitcast */) const {
return true;
}
/// \brief Return true if it is cheap to speculate a call to intrinsic cttz.
virtual bool isCheapToSpeculateCttz() const {
return false;
}
/// \brief Return true if it is cheap to speculate a call to intrinsic ctlz.
virtual bool isCheapToSpeculateCtlz() const {
return false;
}
/// \brief Return if the target supports combining a
/// chain like:
/// \code
/// %andResult = and %val1, #imm-with-one-bit-set;
/// %icmpResult = icmp %andResult, 0
/// br i1 %icmpResult, label %dest1, label %dest2
/// \endcode
/// into a single machine instruction of a form like:
/// \code
/// brOnBitSet %register, #bitNumber, dest
/// \endcode
bool isMaskAndBranchFoldingLegal() const {
return MaskAndBranchFoldingIsLegal;
}
/// \brief Return true if the target wants to use the optimization that
/// turns ext(promotableInst1(...(promotableInstN(load)))) into
/// promotedInst1(...(promotedInstN(ext(load)))).
bool enableExtLdPromotion() const { return EnableExtLdPromotion; }
/// Return true if the target can combine store(extractelement VectorTy,
/// Idx).
/// \p Cost[out] gives the cost of that transformation when this is true.
virtual bool canCombineStoreAndExtract(Type *VectorTy, Value *Idx,
unsigned &Cost) const {
return false;
}
/// Return true if target supports floating point exceptions.
bool hasFloatingPointExceptions() const {
return HasFloatingPointExceptions;
}
/// Return true if target always beneficiates from combining into FMA for a
/// given value type. This must typically return false on targets where FMA
/// takes more cycles to execute than FADD.
virtual bool enableAggressiveFMAFusion(EVT VT) const {
return false;
}
/// Return the ValueType of the result of SETCC operations.
virtual EVT getSetCCResultType(LLVMContext &Context, EVT VT) const;
/// Return the ValueType for comparison libcalls. Comparions libcalls include
/// floating point comparion calls, and Ordered/Unordered check calls on
/// floating point numbers.
virtual
MVT::SimpleValueType getCmpLibcallReturnType() const;
/// For targets without i1 registers, this gives the nature of the high-bits
/// of boolean values held in types wider than i1.
///
/// "Boolean values" are special true/false values produced by nodes like
/// SETCC and consumed (as the condition) by nodes like SELECT and BRCOND.
/// Not to be confused with general values promoted from i1. Some cpus
/// distinguish between vectors of boolean and scalars; the isVec parameter
/// selects between the two kinds. For example on X86 a scalar boolean should
/// be zero extended from i1, while the elements of a vector of booleans
/// should be sign extended from i1.
///
/// Some cpus also treat floating point types the same way as they treat
/// vectors instead of the way they treat scalars.
BooleanContent getBooleanContents(bool isVec, bool isFloat) const {
if (isVec)
return BooleanVectorContents;
return isFloat ? BooleanFloatContents : BooleanContents;
}
BooleanContent getBooleanContents(EVT Type) const {
return getBooleanContents(Type.isVector(), Type.isFloatingPoint());
}
/// Return target scheduling preference.
Sched::Preference getSchedulingPreference() const {
return SchedPreferenceInfo;
}
/// Some scheduler, e.g. hybrid, can switch to different scheduling heuristics
/// for different nodes. This function returns the preference (or none) for
/// the given node.
virtual Sched::Preference getSchedulingPreference(SDNode *) const {
return Sched::None;
}
/// Return the register class that should be used for the specified value
/// type.
virtual const TargetRegisterClass *getRegClassFor(MVT VT) const {
const TargetRegisterClass *RC = RegClassForVT[VT.SimpleTy];
assert(RC && "This value type is not natively supported!");
return RC;
}
/// Return the 'representative' register class for the specified value
/// type.
///
/// The 'representative' register class is the largest legal super-reg
/// register class for the register class of the value type. For example, on
/// i386 the rep register class for i8, i16, and i32 are GR32; while the rep
/// register class is GR64 on x86_64.
virtual const TargetRegisterClass *getRepRegClassFor(MVT VT) const {
const TargetRegisterClass *RC = RepRegClassForVT[VT.SimpleTy];
return RC;
}
/// Return the cost of the 'representative' register class for the specified
/// value type.
virtual uint8_t getRepRegClassCostFor(MVT VT) const {
return RepRegClassCostForVT[VT.SimpleTy];
}
/// Return true if the target has native support for the specified value type.
/// This means that it has a register that directly holds it without
/// promotions or expansions.
bool isTypeLegal(EVT VT) const {
assert(!VT.isSimple() ||
(unsigned)VT.getSimpleVT().SimpleTy < array_lengthof(RegClassForVT));
return VT.isSimple() && RegClassForVT[VT.getSimpleVT().SimpleTy] != nullptr;
}
class ValueTypeActionImpl {
/// ValueTypeActions - For each value type, keep a LegalizeTypeAction enum
/// that indicates how instruction selection should deal with the type.
uint8_t ValueTypeActions[MVT::LAST_VALUETYPE];
public:
ValueTypeActionImpl() {
std::fill(std::begin(ValueTypeActions), std::end(ValueTypeActions), 0);
}
LegalizeTypeAction getTypeAction(MVT VT) const {
return (LegalizeTypeAction)ValueTypeActions[VT.SimpleTy];
}
void setTypeAction(MVT VT, LegalizeTypeAction Action) {
unsigned I = VT.SimpleTy;
ValueTypeActions[I] = Action;
}
};
const ValueTypeActionImpl &getValueTypeActions() const {
return ValueTypeActions;
}
/// Return how we should legalize values of this type, either it is already
/// legal (return 'Legal') or we need to promote it to a larger type (return
/// 'Promote'), or we need to expand it into multiple registers of smaller
/// integer type (return 'Expand'). 'Custom' is not an option.
LegalizeTypeAction getTypeAction(LLVMContext &Context, EVT VT) const {
return getTypeConversion(Context, VT).first;
}
LegalizeTypeAction getTypeAction(MVT VT) const {
return ValueTypeActions.getTypeAction(VT);
}
/// For types supported by the target, this is an identity function. For
/// types that must be promoted to larger types, this returns the larger type
/// to promote to. For integer types that are larger than the largest integer
/// register, this contains one step in the expansion to get to the smaller
/// register. For illegal floating point types, this returns the integer type
/// to transform to.
EVT getTypeToTransformTo(LLVMContext &Context, EVT VT) const {
return getTypeConversion(Context, VT).second;
}
/// For types supported by the target, this is an identity function. For
/// types that must be expanded (i.e. integer types that are larger than the
/// largest integer register or illegal floating point types), this returns
/// the largest legal type it will be expanded to.
EVT getTypeToExpandTo(LLVMContext &Context, EVT VT) const {
assert(!VT.isVector());
while (true) {
switch (getTypeAction(Context, VT)) {
case TypeLegal:
return VT;
case TypeExpandInteger:
VT = getTypeToTransformTo(Context, VT);
break;
default:
llvm_unreachable("Type is not legal nor is it to be expanded!");
}
}
}
/// Vector types are broken down into some number of legal first class types.
/// For example, EVT::v8f32 maps to 2 EVT::v4f32 with Altivec or SSE1, or 8
/// promoted EVT::f64 values with the X86 FP stack. Similarly, EVT::v2i64
/// turns into 4 EVT::i32 values with both PPC and X86.
///
/// This method returns the number of registers needed, and the VT for each
/// register. It also returns the VT and quantity of the intermediate values
/// before they are promoted/expanded.
unsigned getVectorTypeBreakdown(LLVMContext &Context, EVT VT,
EVT &IntermediateVT,
unsigned &NumIntermediates,
MVT &RegisterVT) const;
struct IntrinsicInfo {
unsigned opc; // target opcode
EVT memVT; // memory VT
const Value* ptrVal; // value representing memory location
int offset; // offset off of ptrVal
unsigned size; // the size of the memory location
// (taken from memVT if zero)
unsigned align; // alignment
bool vol; // is volatile?
bool readMem; // reads memory?
bool writeMem; // writes memory?
IntrinsicInfo() : opc(0), ptrVal(nullptr), offset(0), size(0), align(1),
vol(false), readMem(false), writeMem(false) {}
};
/// Given an intrinsic, checks if on the target the intrinsic will need to map
/// to a MemIntrinsicNode (touches memory). If this is the case, it returns
/// true and store the intrinsic information into the IntrinsicInfo that was
/// passed to the function.
virtual bool getTgtMemIntrinsic(IntrinsicInfo &, const CallInst &,
unsigned /*Intrinsic*/) const {
return false;
}
/// Returns true if the target can instruction select the specified FP
/// immediate natively. If false, the legalizer will materialize the FP
/// immediate as a load from a constant pool.
virtual bool isFPImmLegal(const APFloat &/*Imm*/, EVT /*VT*/) const {
return false;
}
/// Targets can use this to indicate that they only support *some*
/// VECTOR_SHUFFLE operations, those with specific masks. By default, if a
/// target supports the VECTOR_SHUFFLE node, all mask values are assumed to be
/// legal.
virtual bool isShuffleMaskLegal(const SmallVectorImpl<int> &/*Mask*/,
EVT /*VT*/) const {
return true;
}
/// Returns true if the operation can trap for the value type.
///
/// VT must be a legal type. By default, we optimistically assume most
/// operations don't trap except for divide and remainder.
virtual bool canOpTrap(unsigned Op, EVT VT) const;
/// Similar to isShuffleMaskLegal. This is used by Targets can use this to
/// indicate if there is a suitable VECTOR_SHUFFLE that can be used to replace
/// a VAND with a constant pool entry.
virtual bool isVectorClearMaskLegal(const SmallVectorImpl<int> &/*Mask*/,
EVT /*VT*/) const {
return false;
}
/// Return how this operation should be treated: either it is legal, needs to
/// be promoted to a larger size, needs to be expanded to some other code
/// sequence, or the target has a custom expander for it.
LegalizeAction getOperationAction(unsigned Op, EVT VT) const {
if (VT.isExtended()) return Expand;
// If a target-specific SDNode requires legalization, require the target
// to provide custom legalization for it.
if (Op > array_lengthof(OpActions[0])) return Custom;
unsigned I = (unsigned) VT.getSimpleVT().SimpleTy;
return (LegalizeAction)OpActions[I][Op];
}
/// Return true if the specified operation is legal on this target or can be
/// made legal with custom lowering. This is used to help guide high-level
/// lowering decisions.
bool isOperationLegalOrCustom(unsigned Op, EVT VT) const {
return (VT == MVT::Other || isTypeLegal(VT)) &&
(getOperationAction(Op, VT) == Legal ||
getOperationAction(Op, VT) == Custom);
}
/// Return true if the specified operation is legal on this target or can be
/// made legal using promotion. This is used to help guide high-level lowering
/// decisions.
bool isOperationLegalOrPromote(unsigned Op, EVT VT) const {
return (VT == MVT::Other || isTypeLegal(VT)) &&
(getOperationAction(Op, VT) == Legal ||
getOperationAction(Op, VT) == Promote);
}
/// Return true if the specified operation is illegal on this target or
/// unlikely to be made legal with custom lowering. This is used to help guide
/// high-level lowering decisions.
bool isOperationExpand(unsigned Op, EVT VT) const {
return (!isTypeLegal(VT) || getOperationAction(Op, VT) == Expand);
}
/// Return true if the specified operation is legal on this target.
bool isOperationLegal(unsigned Op, EVT VT) const {
return (VT == MVT::Other || isTypeLegal(VT)) &&
getOperationAction(Op, VT) == Legal;
}
/// Return how this load with extension should be treated: either it is legal,
/// needs to be promoted to a larger size, needs to be expanded to some other
/// code sequence, or the target has a custom expander for it.
LegalizeAction getLoadExtAction(unsigned ExtType, EVT ValVT, EVT MemVT) const {
if (ValVT.isExtended() || MemVT.isExtended()) return Expand;
unsigned ValI = (unsigned) ValVT.getSimpleVT().SimpleTy;
unsigned MemI = (unsigned) MemVT.getSimpleVT().SimpleTy;
assert(ExtType < ISD::LAST_LOADEXT_TYPE && ValI < MVT::LAST_VALUETYPE &&
MemI < MVT::LAST_VALUETYPE && "Table isn't big enough!");
return (LegalizeAction)LoadExtActions[ValI][MemI][ExtType];
}
/// Return true if the specified load with extension is legal on this target.
bool isLoadExtLegal(unsigned ExtType, EVT ValVT, EVT MemVT) const {
return ValVT.isSimple() && MemVT.isSimple() &&
getLoadExtAction(ExtType, ValVT, MemVT) == Legal;
}
/// Return true if the specified load with extension is legal or custom
/// on this target.
bool isLoadExtLegalOrCustom(unsigned ExtType, EVT ValVT, EVT MemVT) const {
return ValVT.isSimple() && MemVT.isSimple() &&
(getLoadExtAction(ExtType, ValVT, MemVT) == Legal ||
getLoadExtAction(ExtType, ValVT, MemVT) == Custom);
}
/// Return how this store with truncation should be treated: either it is
/// legal, needs to be promoted to a larger size, needs to be expanded to some
/// other code sequence, or the target has a custom expander for it.
LegalizeAction getTruncStoreAction(EVT ValVT, EVT MemVT) const {
if (ValVT.isExtended() || MemVT.isExtended()) return Expand;
unsigned ValI = (unsigned) ValVT.getSimpleVT().SimpleTy;
unsigned MemI = (unsigned) MemVT.getSimpleVT().SimpleTy;
assert(ValI < MVT::LAST_VALUETYPE && MemI < MVT::LAST_VALUETYPE &&
"Table isn't big enough!");
return (LegalizeAction)TruncStoreActions[ValI][MemI];
}
/// Return true if the specified store with truncation is legal on this
/// target.
bool isTruncStoreLegal(EVT ValVT, EVT MemVT) const {
return isTypeLegal(ValVT) && MemVT.isSimple() &&
getTruncStoreAction(ValVT.getSimpleVT(), MemVT.getSimpleVT()) == Legal;
}
/// Return how the indexed load should be treated: either it is legal, needs
/// to be promoted to a larger size, needs to be expanded to some other code
/// sequence, or the target has a custom expander for it.
LegalizeAction
getIndexedLoadAction(unsigned IdxMode, MVT VT) const {
assert(IdxMode < ISD::LAST_INDEXED_MODE && VT.isValid() &&
"Table isn't big enough!");
unsigned Ty = (unsigned)VT.SimpleTy;
return (LegalizeAction)((IndexedModeActions[Ty][IdxMode] & 0xf0) >> 4);
}
/// Return true if the specified indexed load is legal on this target.
bool isIndexedLoadLegal(unsigned IdxMode, EVT VT) const {
return VT.isSimple() &&
(getIndexedLoadAction(IdxMode, VT.getSimpleVT()) == Legal ||
getIndexedLoadAction(IdxMode, VT.getSimpleVT()) == Custom);
}
/// Return how the indexed store should be treated: either it is legal, needs
/// to be promoted to a larger size, needs to be expanded to some other code
/// sequence, or the target has a custom expander for it.
LegalizeAction
getIndexedStoreAction(unsigned IdxMode, MVT VT) const {
assert(IdxMode < ISD::LAST_INDEXED_MODE && VT.isValid() &&
"Table isn't big enough!");
unsigned Ty = (unsigned)VT.SimpleTy;
return (LegalizeAction)(IndexedModeActions[Ty][IdxMode] & 0x0f);
}
/// Return true if the specified indexed load is legal on this target.
bool isIndexedStoreLegal(unsigned IdxMode, EVT VT) const {
return VT.isSimple() &&
(getIndexedStoreAction(IdxMode, VT.getSimpleVT()) == Legal ||
getIndexedStoreAction(IdxMode, VT.getSimpleVT()) == Custom);
}
/// Return how the condition code should be treated: either it is legal, needs
/// to be expanded to some other code sequence, or the target has a custom
/// expander for it.
LegalizeAction
getCondCodeAction(ISD::CondCode CC, MVT VT) const {
assert((unsigned)CC < array_lengthof(CondCodeActions) &&
((unsigned)VT.SimpleTy >> 4) < array_lengthof(CondCodeActions[0]) &&
"Table isn't big enough!");
// See setCondCodeAction for how this is encoded.
uint32_t Shift = 2 * (VT.SimpleTy & 0xF);
uint32_t Value = CondCodeActions[CC][VT.SimpleTy >> 4];
LegalizeAction Action = (LegalizeAction) ((Value >> Shift) & 0x3);
assert(Action != Promote && "Can't promote condition code!");
return Action;
}
/// Return true if the specified condition code is legal on this target.
bool isCondCodeLegal(ISD::CondCode CC, MVT VT) const {
return
getCondCodeAction(CC, VT) == Legal ||
getCondCodeAction(CC, VT) == Custom;
}
/// If the action for this operation is to promote, this method returns the
/// ValueType to promote to.
MVT getTypeToPromoteTo(unsigned Op, MVT VT) const {
assert(getOperationAction(Op, VT) == Promote &&
"This operation isn't promoted!");
// See if this has an explicit type specified.
std::map<std::pair<unsigned, MVT::SimpleValueType>,
MVT::SimpleValueType>::const_iterator PTTI =
PromoteToType.find(std::make_pair(Op, VT.SimpleTy));
if (PTTI != PromoteToType.end()) return PTTI->second;
assert((VT.isInteger() || VT.isFloatingPoint()) &&
"Cannot autopromote this type, add it with AddPromotedToType.");
MVT NVT = VT;
do {
NVT = (MVT::SimpleValueType)(NVT.SimpleTy+1);
assert(NVT.isInteger() == VT.isInteger() && NVT != MVT::isVoid &&
"Didn't find type to promote to!");
} while (!isTypeLegal(NVT) ||
getOperationAction(Op, NVT) == Promote);
return NVT;
}
/// Return the EVT corresponding to this LLVM type. This is fixed by the LLVM
/// operations except for the pointer size. If AllowUnknown is true, this
/// will return MVT::Other for types with no EVT counterpart (e.g. structs),
/// otherwise it will assert.
EVT getValueType(Type *Ty, bool AllowUnknown = false) const {
// Lower scalar pointers to native pointer types.
if (PointerType *PTy = dyn_cast<PointerType>(Ty))
return getPointerTy(PTy->getAddressSpace());
if (Ty->isVectorTy()) {
VectorType *VTy = cast<VectorType>(Ty);
Type *Elm = VTy->getElementType();
// Lower vectors of pointers to native pointer types.
if (PointerType *PT = dyn_cast<PointerType>(Elm)) {
EVT PointerTy(getPointerTy(PT->getAddressSpace()));
Elm = PointerTy.getTypeForEVT(Ty->getContext());
}
return EVT::getVectorVT(Ty->getContext(), EVT::getEVT(Elm, false),
VTy->getNumElements());
}
return EVT::getEVT(Ty, AllowUnknown);
}
/// Return the MVT corresponding to this LLVM type. See getValueType.
MVT getSimpleValueType(Type *Ty, bool AllowUnknown = false) const {
return getValueType(Ty, AllowUnknown).getSimpleVT();
}
/// Return the desired alignment for ByVal or InAlloca aggregate function
/// arguments in the caller parameter area. This is the actual alignment, not
/// its logarithm.
virtual unsigned getByValTypeAlignment(Type *Ty) const;
/// Return the type of registers that this ValueType will eventually require.
MVT getRegisterType(MVT VT) const {
assert((unsigned)VT.SimpleTy < array_lengthof(RegisterTypeForVT));
return RegisterTypeForVT[VT.SimpleTy];
}
/// Return the type of registers that this ValueType will eventually require.
MVT getRegisterType(LLVMContext &Context, EVT VT) const {
if (VT.isSimple()) {
assert((unsigned)VT.getSimpleVT().SimpleTy <
array_lengthof(RegisterTypeForVT));
return RegisterTypeForVT[VT.getSimpleVT().SimpleTy];
}
if (VT.isVector()) {
EVT VT1;
MVT RegisterVT;
unsigned NumIntermediates;
(void)getVectorTypeBreakdown(Context, VT, VT1,
NumIntermediates, RegisterVT);
return RegisterVT;
}
if (VT.isInteger()) {
return getRegisterType(Context, getTypeToTransformTo(Context, VT));
}
llvm_unreachable("Unsupported extended type!");
}
/// Return the number of registers that this ValueType will eventually
/// require.
///
/// This is one for any types promoted to live in larger registers, but may be
/// more than one for types (like i64) that are split into pieces. For types
/// like i140, which are first promoted then expanded, it is the number of
/// registers needed to hold all the bits of the original type. For an i140
/// on a 32 bit machine this means 5 registers.
unsigned getNumRegisters(LLVMContext &Context, EVT VT) const {
if (VT.isSimple()) {
assert((unsigned)VT.getSimpleVT().SimpleTy <
array_lengthof(NumRegistersForVT));
return NumRegistersForVT[VT.getSimpleVT().SimpleTy];
}
if (VT.isVector()) {
EVT VT1;
MVT VT2;
unsigned NumIntermediates;
return getVectorTypeBreakdown(Context, VT, VT1, NumIntermediates, VT2);
}
if (VT.isInteger()) {
unsigned BitWidth = VT.getSizeInBits();
unsigned RegWidth = getRegisterType(Context, VT).getSizeInBits();
return (BitWidth + RegWidth - 1) / RegWidth;
}
llvm_unreachable("Unsupported extended type!");
}
/// If true, then instruction selection should seek to shrink the FP constant
/// of the specified type to a smaller type in order to save space and / or
/// reduce runtime.
virtual bool ShouldShrinkFPConstant(EVT) const { return true; }
// Return true if it is profitable to reduce the given load node to a smaller
// type.
//
// e.g. (i16 (trunc (i32 (load x))) -> i16 load x should be performed
virtual bool shouldReduceLoadWidth(SDNode *Load,
ISD::LoadExtType ExtTy,
EVT NewVT) const {
return true;
}
/// When splitting a value of the specified type into parts, does the Lo
/// or Hi part come first? This usually follows the endianness, except
/// for ppcf128, where the Hi part always comes first.
bool hasBigEndianPartOrdering(EVT VT) const {
return isBigEndian() || VT == MVT::ppcf128;
}
/// If true, the target has custom DAG combine transformations that it can
/// perform for the specified node.
bool hasTargetDAGCombine(ISD::NodeType NT) const {
assert(unsigned(NT >> 3) < array_lengthof(TargetDAGCombineArray));
return TargetDAGCombineArray[NT >> 3] & (1 << (NT&7));
}
/// \brief Get maximum # of store operations permitted for llvm.memset
///
/// This function returns the maximum number of store operations permitted
/// to replace a call to llvm.memset. The value is set by the target at the
/// performance threshold for such a replacement. If OptSize is true,
/// return the limit for functions that have OptSize attribute.
unsigned getMaxStoresPerMemset(bool OptSize) const {
return OptSize ? MaxStoresPerMemsetOptSize : MaxStoresPerMemset;
}
/// \brief Get maximum # of store operations permitted for llvm.memcpy
///
/// This function returns the maximum number of store operations permitted
/// to replace a call to llvm.memcpy. The value is set by the target at the
/// performance threshold for such a replacement. If OptSize is true,
/// return the limit for functions that have OptSize attribute.
unsigned getMaxStoresPerMemcpy(bool OptSize) const {
return OptSize ? MaxStoresPerMemcpyOptSize : MaxStoresPerMemcpy;
}
/// \brief Get maximum # of store operations permitted for llvm.memmove
///
/// This function returns the maximum number of store operations permitted
/// to replace a call to llvm.memmove. The value is set by the target at the
/// performance threshold for such a replacement. If OptSize is true,
/// return the limit for functions that have OptSize attribute.
unsigned getMaxStoresPerMemmove(bool OptSize) const {
return OptSize ? MaxStoresPerMemmoveOptSize : MaxStoresPerMemmove;
}
/// \brief Determine if the target supports unaligned memory accesses.
///
/// This function returns true if the target allows unaligned memory accesses
/// of the specified type in the given address space. If true, it also returns
/// whether the unaligned memory access is "fast" in the last argument by
/// reference. This is used, for example, in situations where an array
/// copy/move/set is converted to a sequence of store operations. Its use
/// helps to ensure that such replacements don't generate code that causes an
/// alignment error (trap) on the target machine.
virtual bool allowsMisalignedMemoryAccesses(EVT,
unsigned AddrSpace = 0,
unsigned Align = 1,
bool * /*Fast*/ = nullptr) const {
return false;
}
/// Returns the target specific optimal type for load and store operations as
/// a result of memset, memcpy, and memmove lowering.
///
/// If DstAlign is zero that means it's safe to destination alignment can
/// satisfy any constraint. Similarly if SrcAlign is zero it means there isn't
/// a need to check it against alignment requirement, probably because the
/// source does not need to be loaded. If 'IsMemset' is true, that means it's
/// expanding a memset. If 'ZeroMemset' is true, that means it's a memset of
/// zero. 'MemcpyStrSrc' indicates whether the memcpy source is constant so it
/// does not need to be loaded. It returns EVT::Other if the type should be
/// determined using generic target-independent logic.
virtual EVT getOptimalMemOpType(uint64_t /*Size*/,
unsigned /*DstAlign*/, unsigned /*SrcAlign*/,
bool /*IsMemset*/,
bool /*ZeroMemset*/,
bool /*MemcpyStrSrc*/,
MachineFunction &/*MF*/) const {
return MVT::Other;
}
/// Returns true if it's safe to use load / store of the specified type to
/// expand memcpy / memset inline.
///
/// This is mostly true for all types except for some special cases. For
/// example, on X86 targets without SSE2 f64 load / store are done with fldl /
/// fstpl which also does type conversion. Note the specified type doesn't
/// have to be legal as the hook is used before type legalization.
virtual bool isSafeMemOpType(MVT /*VT*/) const { return true; }
/// Determine if we should use _setjmp or setjmp to implement llvm.setjmp.
bool usesUnderscoreSetJmp() const {
return UseUnderscoreSetJmp;
}
/// Determine if we should use _longjmp or longjmp to implement llvm.longjmp.
bool usesUnderscoreLongJmp() const {
return UseUnderscoreLongJmp;
}
/// Return integer threshold on number of blocks to use jump tables rather
/// than if sequence.
int getMinimumJumpTableEntries() const {
return MinimumJumpTableEntries;
}
/// If a physical register, this specifies the register that
/// llvm.savestack/llvm.restorestack should save and restore.
unsigned getStackPointerRegisterToSaveRestore() const {
return StackPointerRegisterToSaveRestore;
}
/// If a physical register, this returns the register that receives the
/// exception address on entry to a landing pad.
unsigned getExceptionPointerRegister() const {
return ExceptionPointerRegister;
}
/// If a physical register, this returns the register that receives the
/// exception typeid on entry to a landing pad.
unsigned getExceptionSelectorRegister() const {
return ExceptionSelectorRegister;
}
/// Returns the target's jmp_buf size in bytes (if never set, the default is
/// 200)
unsigned getJumpBufSize() const {
return JumpBufSize;
}
/// Returns the target's jmp_buf alignment in bytes (if never set, the default
/// is 0)
unsigned getJumpBufAlignment() const {
return JumpBufAlignment;
}
/// Return the minimum stack alignment of an argument.
unsigned getMinStackArgumentAlignment() const {
return MinStackArgumentAlignment;
}
/// Return the minimum function alignment.
unsigned getMinFunctionAlignment() const {
return MinFunctionAlignment;
}
/// Return the preferred function alignment.
unsigned getPrefFunctionAlignment() const {
return PrefFunctionAlignment;
}
/// Return the preferred loop alignment.
virtual unsigned getPrefLoopAlignment(MachineLoop *ML = nullptr) const {
return PrefLoopAlignment;
}
/// Return whether the DAG builder should automatically insert fences and
/// reduce ordering for atomics.
bool getInsertFencesForAtomic() const {
return InsertFencesForAtomic;
}
/// Return true if the target stores stack protector cookies at a fixed offset
/// in some non-standard address space, and populates the address space and
/// offset as appropriate.
virtual bool getStackCookieLocation(unsigned &/*AddressSpace*/,
unsigned &/*Offset*/) const {
return false;
}
/// Returns true if a cast between SrcAS and DestAS is a noop.
virtual bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const {
return false;
}
/// Return true if the pointer arguments to CI should be aligned by aligning
/// the object whose address is being passed. If so then MinSize is set to the
/// minimum size the object must be to be aligned and PrefAlign is set to the
/// preferred alignment.
virtual bool shouldAlignPointerArgs(CallInst * /*CI*/, unsigned & /*MinSize*/,
unsigned & /*PrefAlign*/) const {
return false;
}
//===--------------------------------------------------------------------===//
/// \name Helpers for TargetTransformInfo implementations
/// @{
/// Get the ISD node that corresponds to the Instruction class opcode.
int InstructionOpcodeToISD(unsigned Opcode) const;
/// Estimate the cost of type-legalization and the legalized type.
std::pair<unsigned, MVT> getTypeLegalizationCost(Type *Ty) const;
/// @}
//===--------------------------------------------------------------------===//
/// \name Helpers for atomic expansion.
/// @{
/// True if AtomicExpandPass should use emitLoadLinked/emitStoreConditional
/// and expand AtomicCmpXchgInst.
virtual bool hasLoadLinkedStoreConditional() const { return false; }
/// Perform a load-linked operation on Addr, returning a "Value *" with the
/// corresponding pointee type. This may entail some non-trivial operations to
/// truncate or reconstruct types that will be illegal in the backend. See
/// ARMISelLowering for an example implementation.
virtual Value *emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
AtomicOrdering Ord) const {
llvm_unreachable("Load linked unimplemented on this target");
}
/// Perform a store-conditional operation to Addr. Return the status of the
/// store. This should be 0 if the store succeeded, non-zero otherwise.
virtual Value *emitStoreConditional(IRBuilder<> &Builder, Value *Val,
Value *Addr, AtomicOrdering Ord) const {
llvm_unreachable("Store conditional unimplemented on this target");
}
/// Inserts in the IR a target-specific intrinsic specifying a fence.
/// It is called by AtomicExpandPass before expanding an
/// AtomicRMW/AtomicCmpXchg/AtomicStore/AtomicLoad.
/// RMW and CmpXchg set both IsStore and IsLoad to true.
/// This function should either return a nullptr, or a pointer to an IR-level
/// Instruction*. Even complex fence sequences can be represented by a
/// single Instruction* through an intrinsic to be lowered later.
/// Backends with !getInsertFencesForAtomic() should keep a no-op here.
/// Backends should override this method to produce target-specific intrinsic
/// for their fences.
/// FIXME: Please note that the default implementation here in terms of
/// IR-level fences exists for historical/compatibility reasons and is
/// *unsound* ! Fences cannot, in general, be used to restore sequential
/// consistency. For example, consider the following example:
/// atomic<int> x = y = 0;
/// int r1, r2, r3, r4;
/// Thread 0:
/// x.store(1);
/// Thread 1:
/// y.store(1);
/// Thread 2:
/// r1 = x.load();
/// r2 = y.load();
/// Thread 3:
/// r3 = y.load();
/// r4 = x.load();
/// r1 = r3 = 1 and r2 = r4 = 0 is impossible as long as the accesses are all
/// seq_cst. But if they are lowered to monotonic accesses, no amount of
/// IR-level fences can prevent it.
/// @{
virtual Instruction* emitLeadingFence(IRBuilder<> &Builder, AtomicOrdering Ord,
bool IsStore, bool IsLoad) const {
if (!getInsertFencesForAtomic())
return nullptr;
if (isAtLeastRelease(Ord) && IsStore)
return Builder.CreateFence(Ord);
else
return nullptr;
}
virtual Instruction* emitTrailingFence(IRBuilder<> &Builder, AtomicOrdering Ord,
bool IsStore, bool IsLoad) const {
if (!getInsertFencesForAtomic())
return nullptr;
if (isAtLeastAcquire(Ord))
return Builder.CreateFence(Ord);
else
return nullptr;
}
/// @}
/// Returns true if the given (atomic) store should be expanded by the
/// IR-level AtomicExpand pass into an "atomic xchg" which ignores its input.
virtual bool shouldExpandAtomicStoreInIR(StoreInst *SI) const {
return false;
}
/// Returns true if arguments should be sign-extended in lib calls.
virtual bool shouldSignExtendTypeInLibCall(EVT Type, bool IsSigned) const {
return IsSigned;
}
/// Returns true if the given (atomic) load should be expanded by the
/// IR-level AtomicExpand pass into a load-linked instruction
/// (through emitLoadLinked()).
virtual bool shouldExpandAtomicLoadInIR(LoadInst *LI) const { return false; }
/// Returns how the IR-level AtomicExpand pass should expand the given
/// AtomicRMW, if at all. Default is to never expand.
virtual AtomicRMWExpansionKind
shouldExpandAtomicRMWInIR(AtomicRMWInst *) const {
return AtomicRMWExpansionKind::None;
}
/// On some platforms, an AtomicRMW that never actually modifies the value
/// (such as fetch_add of 0) can be turned into a fence followed by an
/// atomic load. This may sound useless, but it makes it possible for the
/// processor to keep the cacheline shared, dramatically improving
/// performance. And such idempotent RMWs are useful for implementing some
/// kinds of locks, see for example (justification + benchmarks):
/// http://www.hpl.hp.com/techreports/2012/HPL-2012-68.pdf
/// This method tries doing that transformation, returning the atomic load if
/// it succeeds, and nullptr otherwise.
/// If shouldExpandAtomicLoadInIR returns true on that load, it will undergo
/// another round of expansion.
virtual LoadInst *lowerIdempotentRMWIntoFencedLoad(AtomicRMWInst *RMWI) const {
return nullptr;
}
/// Returns true if we should normalize
/// select(N0&N1, X, Y) => select(N0, select(N1, X, Y), Y) and
/// select(N0|N1, X, Y) => select(N0, select(N1, X, Y, Y)) if it is likely
/// that it saves us from materializing N0 and N1 in an integer register.
/// Targets that are able to perform and/or on flags should return false here.
virtual bool shouldNormalizeToSelectSequence(LLVMContext &Context,
EVT VT) const {
// If a target has multiple condition registers, then it likely has logical
// operations on those registers.
if (hasMultipleConditionRegisters())
return false;
// Only do the transform if the value won't be split into multiple
// registers.
LegalizeTypeAction Action = getTypeAction(Context, VT);
return Action != TypeExpandInteger && Action != TypeExpandFloat &&
Action != TypeSplitVector;
}
//===--------------------------------------------------------------------===//
// TargetLowering Configuration Methods - These methods should be invoked by
// the derived class constructor to configure this object for the target.
//
protected:
/// Specify how the target extends the result of integer and floating point
/// boolean values from i1 to a wider type. See getBooleanContents.
void setBooleanContents(BooleanContent Ty) {
BooleanContents = Ty;
BooleanFloatContents = Ty;
}
/// Specify how the target extends the result of integer and floating point
/// boolean values from i1 to a wider type. See getBooleanContents.
void setBooleanContents(BooleanContent IntTy, BooleanContent FloatTy) {
BooleanContents = IntTy;
BooleanFloatContents = FloatTy;
}
/// Specify how the target extends the result of a vector boolean value from a
/// vector of i1 to a wider type. See getBooleanContents.
void setBooleanVectorContents(BooleanContent Ty) {
BooleanVectorContents = Ty;
}
/// Specify the target scheduling preference.
void setSchedulingPreference(Sched::Preference Pref) {
SchedPreferenceInfo = Pref;
}
/// Indicate whether this target prefers to use _setjmp to implement
/// llvm.setjmp or the version without _. Defaults to false.
void setUseUnderscoreSetJmp(bool Val) {
UseUnderscoreSetJmp = Val;
}
/// Indicate whether this target prefers to use _longjmp to implement
/// llvm.longjmp or the version without _. Defaults to false.
void setUseUnderscoreLongJmp(bool Val) {
UseUnderscoreLongJmp = Val;
}
/// Indicate the number of blocks to generate jump tables rather than if
/// sequence.
void setMinimumJumpTableEntries(int Val) {
MinimumJumpTableEntries = Val;
}
/// If set to a physical register, this specifies the register that
/// llvm.savestack/llvm.restorestack should save and restore.
void setStackPointerRegisterToSaveRestore(unsigned R) {
StackPointerRegisterToSaveRestore = R;
}
/// If set to a physical register, this sets the register that receives the
/// exception address on entry to a landing pad.
void setExceptionPointerRegister(unsigned R) {
ExceptionPointerRegister = R;
}
/// If set to a physical register, this sets the register that receives the
/// exception typeid on entry to a landing pad.
void setExceptionSelectorRegister(unsigned R) {
ExceptionSelectorRegister = R;
}
/// Tells the code generator not to expand operations into sequences that use
/// the select operations if possible.
void setSelectIsExpensive(bool isExpensive = true) {
SelectIsExpensive = isExpensive;
}
/// Tells the code generator that the target has multiple (allocatable)
/// condition registers that can be used to store the results of comparisons
/// for use by selects and conditional branches. With multiple condition
/// registers, the code generator will not aggressively sink comparisons into
/// the blocks of their users.
void setHasMultipleConditionRegisters(bool hasManyRegs = true) {
HasMultipleConditionRegisters = hasManyRegs;
}
/// Tells the code generator that the target has BitExtract instructions.
/// The code generator will aggressively sink "shift"s into the blocks of
/// their users if the users will generate "and" instructions which can be
/// combined with "shift" to BitExtract instructions.
void setHasExtractBitsInsn(bool hasExtractInsn = true) {
HasExtractBitsInsn = hasExtractInsn;
}
/// Tells the code generator not to expand sequence of operations into a
/// separate sequences that increases the amount of flow control.
void setJumpIsExpensive(bool isExpensive = true) {
JumpIsExpensive = isExpensive;
}
/// Tells the code generator that integer divide is expensive, and if
/// possible, should be replaced by an alternate sequence of instructions not
/// containing an integer divide.
void setIntDivIsCheap(bool isCheap = true) { IntDivIsCheap = isCheap; }
/// Tells the code generator that fsqrt is cheap, and should not be replaced
/// with an alternative sequence of instructions.
void setFsqrtIsCheap(bool isCheap = true) { FsqrtIsCheap = isCheap; }
/// Tells the code generator that this target supports floating point
/// exceptions and cares about preserving floating point exception behavior.
void setHasFloatingPointExceptions(bool FPExceptions = true) {
HasFloatingPointExceptions = FPExceptions;
}
/// Tells the code generator which bitwidths to bypass.
void addBypassSlowDiv(unsigned int SlowBitWidth, unsigned int FastBitWidth) {
BypassSlowDivWidths[SlowBitWidth] = FastBitWidth;
}
/// Tells the code generator that it shouldn't generate sra/srl/add/sra for a
/// signed divide by power of two; let the target handle it.
void setPow2SDivIsCheap(bool isCheap = true) { Pow2SDivIsCheap = isCheap; }
/// Add the specified register class as an available regclass for the
/// specified value type. This indicates the selector can handle values of
/// that class natively.
void addRegisterClass(MVT VT, const TargetRegisterClass *RC) {
assert((unsigned)VT.SimpleTy < array_lengthof(RegClassForVT));
AvailableRegClasses.push_back(std::make_pair(VT, RC));
RegClassForVT[VT.SimpleTy] = RC;
}
/// Remove all register classes.
void clearRegisterClasses() {
memset(RegClassForVT, 0,MVT::LAST_VALUETYPE * sizeof(TargetRegisterClass*));
AvailableRegClasses.clear();
}
/// \brief Remove all operation actions.
void clearOperationActions() {
}
/// Return the largest legal super-reg register class of the register class
/// for the specified type and its associated "cost".
virtual std::pair<const TargetRegisterClass *, uint8_t>
findRepresentativeClass(const TargetRegisterInfo *TRI, MVT VT) const;
/// Once all of the register classes are added, this allows us to compute
/// derived properties we expose.
void computeRegisterProperties(const TargetRegisterInfo *TRI);
/// Indicate that the specified operation does not work with the specified
/// type and indicate what to do about it.
void setOperationAction(unsigned Op, MVT VT,
LegalizeAction Action) {
assert(Op < array_lengthof(OpActions[0]) && "Table isn't big enough!");
OpActions[(unsigned)VT.SimpleTy][Op] = (uint8_t)Action;
}
/// Indicate that the specified load with extension does not work with the
/// specified type and indicate what to do about it.
void setLoadExtAction(unsigned ExtType, MVT ValVT, MVT MemVT,
LegalizeAction Action) {
assert(ExtType < ISD::LAST_LOADEXT_TYPE && ValVT.isValid() &&
MemVT.isValid() && "Table isn't big enough!");
LoadExtActions[ValVT.SimpleTy][MemVT.SimpleTy][ExtType] = (uint8_t)Action;
}
/// Indicate that the specified truncating store does not work with the
/// specified type and indicate what to do about it.
void setTruncStoreAction(MVT ValVT, MVT MemVT,
LegalizeAction Action) {
assert(ValVT.isValid() && MemVT.isValid() && "Table isn't big enough!");
TruncStoreActions[ValVT.SimpleTy][MemVT.SimpleTy] = (uint8_t)Action;
}
/// Indicate that the specified indexed load does or does not work with the
/// specified type and indicate what to do abort it.
///
/// NOTE: All indexed mode loads are initialized to Expand in
/// TargetLowering.cpp
void setIndexedLoadAction(unsigned IdxMode, MVT VT,
LegalizeAction Action) {
assert(VT.isValid() && IdxMode < ISD::LAST_INDEXED_MODE &&
(unsigned)Action < 0xf && "Table isn't big enough!");
// Load action are kept in the upper half.
IndexedModeActions[(unsigned)VT.SimpleTy][IdxMode] &= ~0xf0;
IndexedModeActions[(unsigned)VT.SimpleTy][IdxMode] |= ((uint8_t)Action) <<4;
}
/// Indicate that the specified indexed store does or does not work with the
/// specified type and indicate what to do about it.
///
/// NOTE: All indexed mode stores are initialized to Expand in
/// TargetLowering.cpp
void setIndexedStoreAction(unsigned IdxMode, MVT VT,
LegalizeAction Action) {
assert(VT.isValid() && IdxMode < ISD::LAST_INDEXED_MODE &&
(unsigned)Action < 0xf && "Table isn't big enough!");
// Store action are kept in the lower half.
IndexedModeActions[(unsigned)VT.SimpleTy][IdxMode] &= ~0x0f;
IndexedModeActions[(unsigned)VT.SimpleTy][IdxMode] |= ((uint8_t)Action);
}
/// Indicate that the specified condition code is or isn't supported on the
/// target and indicate what to do about it.
void setCondCodeAction(ISD::CondCode CC, MVT VT,
LegalizeAction Action) {
assert(VT.isValid() && (unsigned)CC < array_lengthof(CondCodeActions) &&
"Table isn't big enough!");
/// The lower 5 bits of the SimpleTy index into Nth 2bit set from the 32-bit
/// value and the upper 27 bits index into the second dimension of the array
/// to select what 32-bit value to use.
uint32_t Shift = 2 * (VT.SimpleTy & 0xF);
CondCodeActions[CC][VT.SimpleTy >> 4] &= ~((uint32_t)0x3 << Shift);
CondCodeActions[CC][VT.SimpleTy >> 4] |= (uint32_t)Action << Shift;
}
/// If Opc/OrigVT is specified as being promoted, the promotion code defaults
/// to trying a larger integer/fp until it can find one that works. If that
/// default is insufficient, this method can be used by the target to override
/// the default.
void AddPromotedToType(unsigned Opc, MVT OrigVT, MVT DestVT) {
PromoteToType[std::make_pair(Opc, OrigVT.SimpleTy)] = DestVT.SimpleTy;
}
/// Targets should invoke this method for each target independent node that
/// they want to provide a custom DAG combiner for by implementing the
/// PerformDAGCombine virtual method.
void setTargetDAGCombine(ISD::NodeType NT) {
assert(unsigned(NT >> 3) < array_lengthof(TargetDAGCombineArray));
TargetDAGCombineArray[NT >> 3] |= 1 << (NT&7);
}
/// Set the target's required jmp_buf buffer size (in bytes); default is 200
void setJumpBufSize(unsigned Size) {
JumpBufSize = Size;
}
/// Set the target's required jmp_buf buffer alignment (in bytes); default is
/// 0
void setJumpBufAlignment(unsigned Align) {
JumpBufAlignment = Align;
}
/// Set the target's minimum function alignment (in log2(bytes))
void setMinFunctionAlignment(unsigned Align) {
MinFunctionAlignment = Align;
}
/// Set the target's preferred function alignment. This should be set if
/// there is a performance benefit to higher-than-minimum alignment (in
/// log2(bytes))
void setPrefFunctionAlignment(unsigned Align) {
PrefFunctionAlignment = Align;
}
/// Set the target's preferred loop alignment. Default alignment is zero, it
/// means the target does not care about loop alignment. The alignment is
/// specified in log2(bytes). The target may also override
/// getPrefLoopAlignment to provide per-loop values.
void setPrefLoopAlignment(unsigned Align) {
PrefLoopAlignment = Align;
}
/// Set the minimum stack alignment of an argument (in log2(bytes)).
void setMinStackArgumentAlignment(unsigned Align) {
MinStackArgumentAlignment = Align;
}
/// Set if the DAG builder should automatically insert fences and reduce the
/// order of atomic memory operations to Monotonic.
void setInsertFencesForAtomic(bool fence) {
InsertFencesForAtomic = fence;
}
public:
//===--------------------------------------------------------------------===//
// Addressing mode description hooks (used by LSR etc).
//
/// CodeGenPrepare sinks address calculations into the same BB as Load/Store
/// instructions reading the address. This allows as much computation as
/// possible to be done in the address mode for that operand. This hook lets
/// targets also pass back when this should be done on intrinsics which
/// load/store.
virtual bool GetAddrModeArguments(IntrinsicInst * /*I*/,
SmallVectorImpl<Value*> &/*Ops*/,
Type *&/*AccessTy*/) const {
return false;
}
/// This represents an addressing mode of:
/// BaseGV + BaseOffs + BaseReg + Scale*ScaleReg
/// If BaseGV is null, there is no BaseGV.
/// If BaseOffs is zero, there is no base offset.
/// If HasBaseReg is false, there is no base register.
/// If Scale is zero, there is no ScaleReg. Scale of 1 indicates a reg with
/// no scale.
struct AddrMode {
GlobalValue *BaseGV;
int64_t BaseOffs;
bool HasBaseReg;
int64_t Scale;
AddrMode() : BaseGV(nullptr), BaseOffs(0), HasBaseReg(false), Scale(0) {}
};
/// Return true if the addressing mode represented by AM is legal for this
/// target, for a load/store of the specified type.
///
/// The type may be VoidTy, in which case only return true if the addressing
/// mode is legal for a load/store of any legal type. TODO: Handle
/// pre/postinc as well.
virtual bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const;
/// \brief Return the cost of the scaling factor used in the addressing mode
/// represented by AM for this target, for a load/store of the specified type.
///
/// If the AM is supported, the return value must be >= 0.
/// If the AM is not supported, it returns a negative value.
/// TODO: Handle pre/postinc as well.
virtual int getScalingFactorCost(const AddrMode &AM, Type *Ty) const {
// Default: assume that any scaling factor used in a legal AM is free.
if (isLegalAddressingMode(AM, Ty)) return 0;
return -1;
}
/// Return true if the specified immediate is legal icmp immediate, that is
/// the target has icmp instructions which can compare a register against the
/// immediate without having to materialize the immediate into a register.
virtual bool isLegalICmpImmediate(int64_t) const {
return true;
}
/// Return true if the specified immediate is legal add immediate, that is the
/// target has add instructions which can add a register with the immediate
/// without having to materialize the immediate into a register.
virtual bool isLegalAddImmediate(int64_t) const {
return true;
}
/// Return true if it's significantly cheaper to shift a vector by a uniform
/// scalar than by an amount which will vary across each lane. On x86, for
/// example, there is a "psllw" instruction for the former case, but no simple
/// instruction for a general "a << b" operation on vectors.
virtual bool isVectorShiftByScalarCheap(Type *Ty) const {
return false;
}
/// Return true if it's free to truncate a value of type Ty1 to type
/// Ty2. e.g. On x86 it's free to truncate a i32 value in register EAX to i16
/// by referencing its sub-register AX.
virtual bool isTruncateFree(Type * /*Ty1*/, Type * /*Ty2*/) const {
return false;
}
/// Return true if a truncation from Ty1 to Ty2 is permitted when deciding
/// whether a call is in tail position. Typically this means that both results
/// would be assigned to the same register or stack slot, but it could mean
/// the target performs adequate checks of its own before proceeding with the
/// tail call.
virtual bool allowTruncateForTailCall(Type * /*Ty1*/, Type * /*Ty2*/) const {
return false;
}
virtual bool isTruncateFree(EVT /*VT1*/, EVT /*VT2*/) const {
return false;
}
virtual bool isProfitableToHoist(Instruction *I) const { return true; }
/// Return true if the extension represented by \p I is free.
/// Unlikely the is[Z|FP]ExtFree family which is based on types,
/// this method can use the context provided by \p I to decide
/// whether or not \p I is free.
/// This method extends the behavior of the is[Z|FP]ExtFree family.
/// In other words, if is[Z|FP]Free returns true, then this method
/// returns true as well. The converse is not true.
/// The target can perform the adequate checks by overriding isExtFreeImpl.
/// \pre \p I must be a sign, zero, or fp extension.
bool isExtFree(const Instruction *I) const {
switch (I->getOpcode()) {
case Instruction::FPExt:
if (isFPExtFree(EVT::getEVT(I->getType())))
return true;
break;
case Instruction::ZExt:
if (isZExtFree(I->getOperand(0)->getType(), I->getType()))
return true;
break;
case Instruction::SExt:
break;
default:
llvm_unreachable("Instruction is not an extension");
}
return isExtFreeImpl(I);
}
/// Return true if any actual instruction that defines a value of type Ty1
/// implicitly zero-extends the value to Ty2 in the result register.
///
/// This does not necessarily include registers defined in unknown ways, such
/// as incoming arguments, or copies from unknown virtual registers. Also, if
/// isTruncateFree(Ty2, Ty1) is true, this does not necessarily apply to
/// truncate instructions. e.g. on x86-64, all instructions that define 32-bit
/// values implicit zero-extend the result out to 64 bits.
virtual bool isZExtFree(Type * /*Ty1*/, Type * /*Ty2*/) const {
return false;
}
virtual bool isZExtFree(EVT /*VT1*/, EVT /*VT2*/) const {
return false;
}
/// Return true if the target supplies and combines to a paired load
/// two loaded values of type LoadedType next to each other in memory.
/// RequiredAlignment gives the minimal alignment constraints that must be met
/// to be able to select this paired load.
///
/// This information is *not* used to generate actual paired loads, but it is
/// used to generate a sequence of loads that is easier to combine into a
/// paired load.
/// For instance, something like this:
/// a = load i64* addr
/// b = trunc i64 a to i32
/// c = lshr i64 a, 32
/// d = trunc i64 c to i32
/// will be optimized into:
/// b = load i32* addr1
/// d = load i32* addr2
/// Where addr1 = addr2 +/- sizeof(i32).
///
/// In other words, unless the target performs a post-isel load combining,
/// this information should not be provided because it will generate more
/// loads.
virtual bool hasPairedLoad(Type * /*LoadedType*/,
unsigned & /*RequiredAligment*/) const {
return false;
}
virtual bool hasPairedLoad(EVT /*LoadedType*/,
unsigned & /*RequiredAligment*/) const {
return false;
}
/// Return true if zero-extending the specific node Val to type VT2 is free
/// (either because it's implicitly zero-extended such as ARM ldrb / ldrh or
/// because it's folded such as X86 zero-extending loads).
virtual bool isZExtFree(SDValue Val, EVT VT2) const {
return isZExtFree(Val.getValueType(), VT2);
}
/// Return true if an fpext operation is free (for instance, because
/// single-precision floating-point numbers are implicitly extended to
/// double-precision).
virtual bool isFPExtFree(EVT VT) const {
assert(VT.isFloatingPoint());
return false;
}
/// Return true if folding a vector load into ExtVal (a sign, zero, or any
/// extend node) is profitable.
virtual bool isVectorLoadExtDesirable(SDValue ExtVal) const { return false; }
/// Return true if an fneg operation is free to the point where it is never
/// worthwhile to replace it with a bitwise operation.
virtual bool isFNegFree(EVT VT) const {
assert(VT.isFloatingPoint());
return false;
}
/// Return true if an fabs operation is free to the point where it is never
/// worthwhile to replace it with a bitwise operation.
virtual bool isFAbsFree(EVT VT) const {
assert(VT.isFloatingPoint());
return false;
}
/// Return true if an FMA operation is faster than a pair of fmul and fadd
/// instructions. fmuladd intrinsics will be expanded to FMAs when this method
/// returns true, otherwise fmuladd is expanded to fmul + fadd.
///
/// NOTE: This may be called before legalization on types for which FMAs are
/// not legal, but should return true if those types will eventually legalize
/// to types that support FMAs. After legalization, it will only be called on
/// types that support FMAs (via Legal or Custom actions)
virtual bool isFMAFasterThanFMulAndFAdd(EVT) const {
return false;
}
/// Return true if it's profitable to narrow operations of type VT1 to
/// VT2. e.g. on x86, it's profitable to narrow from i32 to i8 but not from
/// i32 to i16.
virtual bool isNarrowingProfitable(EVT /*VT1*/, EVT /*VT2*/) const {
return false;
}
/// \brief Return true if it is beneficial to convert a load of a constant to
/// just the constant itself.
/// On some targets it might be more efficient to use a combination of
/// arithmetic instructions to materialize the constant instead of loading it
/// from a constant pool.
virtual bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
Type *Ty) const {
return false;
}
/// Return true if EXTRACT_SUBVECTOR is cheap for this result type
/// with this index. This is needed because EXTRACT_SUBVECTOR usually
/// has custom lowering that depends on the index of the first element,
/// and only the target knows which lowering is cheap.
virtual bool isExtractSubvectorCheap(EVT ResVT, unsigned Index) const {
return false;
}
//===--------------------------------------------------------------------===//
// Runtime Library hooks
//
/// Rename the default libcall routine name for the specified libcall.
void setLibcallName(RTLIB::Libcall Call, const char *Name) {
LibcallRoutineNames[Call] = Name;
}
/// Get the libcall routine name for the specified libcall.
const char *getLibcallName(RTLIB::Libcall Call) const {
return LibcallRoutineNames[Call];
}
/// Override the default CondCode to be used to test the result of the
/// comparison libcall against zero.
void setCmpLibcallCC(RTLIB::Libcall Call, ISD::CondCode CC) {
CmpLibcallCCs[Call] = CC;
}
/// Get the CondCode that's to be used to test the result of the comparison
/// libcall against zero.
ISD::CondCode getCmpLibcallCC(RTLIB::Libcall Call) const {
return CmpLibcallCCs[Call];
}
/// Set the CallingConv that should be used for the specified libcall.
void setLibcallCallingConv(RTLIB::Libcall Call, CallingConv::ID CC) {
LibcallCallingConvs[Call] = CC;
}
/// Get the CallingConv that should be used for the specified libcall.
CallingConv::ID getLibcallCallingConv(RTLIB::Libcall Call) const {
return LibcallCallingConvs[Call];
}
private:
const TargetMachine &TM;
/// True if this is a little endian target.
bool IsLittleEndian;
/// Tells the code generator not to expand operations into sequences that use
/// the select operations if possible.
bool SelectIsExpensive;
/// Tells the code generator that the target has multiple (allocatable)
/// condition registers that can be used to store the results of comparisons
/// for use by selects and conditional branches. With multiple condition
/// registers, the code generator will not aggressively sink comparisons into
/// the blocks of their users.
bool HasMultipleConditionRegisters;
/// Tells the code generator that the target has BitExtract instructions.
/// The code generator will aggressively sink "shift"s into the blocks of
/// their users if the users will generate "and" instructions which can be
/// combined with "shift" to BitExtract instructions.
bool HasExtractBitsInsn;
/// Tells the code generator not to expand integer divides by constants into a
/// sequence of muls, adds, and shifts. This is a hack until a real cost
/// model is in place. If we ever optimize for size, this will be set to true
/// unconditionally.
bool IntDivIsCheap;
// Don't expand fsqrt with an approximation based on the inverse sqrt.
bool FsqrtIsCheap;
/// Tells the code generator to bypass slow divide or remainder
/// instructions. For example, BypassSlowDivWidths[32,8] tells the code
/// generator to bypass 32-bit integer div/rem with an 8-bit unsigned integer
/// div/rem when the operands are positive and less than 256.
DenseMap <unsigned int, unsigned int> BypassSlowDivWidths;
/// Tells the code generator that it shouldn't generate sra/srl/add/sra for a
/// signed divide by power of two; let the target handle it.
bool Pow2SDivIsCheap;
/// Tells the code generator that it shouldn't generate extra flow control
/// instructions and should attempt to combine flow control instructions via
/// predication.
bool JumpIsExpensive;
/// Whether the target supports or cares about preserving floating point
/// exception behavior.
bool HasFloatingPointExceptions;
/// This target prefers to use _setjmp to implement llvm.setjmp.
///
/// Defaults to false.
bool UseUnderscoreSetJmp;
/// This target prefers to use _longjmp to implement llvm.longjmp.
///
/// Defaults to false.
bool UseUnderscoreLongJmp;
/// Number of blocks threshold to use jump tables.
int MinimumJumpTableEntries;
/// Information about the contents of the high-bits in boolean values held in
/// a type wider than i1. See getBooleanContents.
BooleanContent BooleanContents;
/// Information about the contents of the high-bits in boolean values held in
/// a type wider than i1. See getBooleanContents.
BooleanContent BooleanFloatContents;
/// Information about the contents of the high-bits in boolean vector values
/// when the element type is wider than i1. See getBooleanContents.
BooleanContent BooleanVectorContents;
/// The target scheduling preference: shortest possible total cycles or lowest
/// register usage.
Sched::Preference SchedPreferenceInfo;
/// The size, in bytes, of the target's jmp_buf buffers
unsigned JumpBufSize;
/// The alignment, in bytes, of the target's jmp_buf buffers
unsigned JumpBufAlignment;
/// The minimum alignment that any argument on the stack needs to have.
unsigned MinStackArgumentAlignment;
/// The minimum function alignment (used when optimizing for size, and to
/// prevent explicitly provided alignment from leading to incorrect code).
unsigned MinFunctionAlignment;
/// The preferred function alignment (used when alignment unspecified and
/// optimizing for speed).
unsigned PrefFunctionAlignment;
/// The preferred loop alignment.
unsigned PrefLoopAlignment;
/// Whether the DAG builder should automatically insert fences and reduce
/// ordering for atomics. (This will be set for for most architectures with
/// weak memory ordering.)
bool InsertFencesForAtomic;
/// If set to a physical register, this specifies the register that
/// llvm.savestack/llvm.restorestack should save and restore.
unsigned StackPointerRegisterToSaveRestore;
/// If set to a physical register, this specifies the register that receives
/// the exception address on entry to a landing pad.
unsigned ExceptionPointerRegister;
/// If set to a physical register, this specifies the register that receives
/// the exception typeid on entry to a landing pad.
unsigned ExceptionSelectorRegister;
/// This indicates the default register class to use for each ValueType the
/// target supports natively.
const TargetRegisterClass *RegClassForVT[MVT::LAST_VALUETYPE];
unsigned char NumRegistersForVT[MVT::LAST_VALUETYPE];
MVT RegisterTypeForVT[MVT::LAST_VALUETYPE];
/// This indicates the "representative" register class to use for each
/// ValueType the target supports natively. This information is used by the
/// scheduler to track register pressure. By default, the representative
/// register class is the largest legal super-reg register class of the
/// register class of the specified type. e.g. On x86, i8, i16, and i32's
/// representative class would be GR32.
const TargetRegisterClass *RepRegClassForVT[MVT::LAST_VALUETYPE];
/// This indicates the "cost" of the "representative" register class for each
/// ValueType. The cost is used by the scheduler to approximate register
/// pressure.
uint8_t RepRegClassCostForVT[MVT::LAST_VALUETYPE];
/// For any value types we are promoting or expanding, this contains the value
/// type that we are changing to. For Expanded types, this contains one step
/// of the expand (e.g. i64 -> i32), even if there are multiple steps required
/// (e.g. i64 -> i16). For types natively supported by the system, this holds
/// the same type (e.g. i32 -> i32).
MVT TransformToType[MVT::LAST_VALUETYPE];
/// For each operation and each value type, keep a LegalizeAction that
/// indicates how instruction selection should deal with the operation. Most
/// operations are Legal (aka, supported natively by the target), but
/// operations that are not should be described. Note that operations on
/// non-legal value types are not described here.
uint8_t OpActions[MVT::LAST_VALUETYPE][ISD::BUILTIN_OP_END];
/// For each load extension type and each value type, keep a LegalizeAction
/// that indicates how instruction selection should deal with a load of a
/// specific value type and extension type.
uint8_t LoadExtActions[MVT::LAST_VALUETYPE][MVT::LAST_VALUETYPE]
[ISD::LAST_LOADEXT_TYPE];
/// For each value type pair keep a LegalizeAction that indicates whether a
/// truncating store of a specific value type and truncating type is legal.
uint8_t TruncStoreActions[MVT::LAST_VALUETYPE][MVT::LAST_VALUETYPE];
/// For each indexed mode and each value type, keep a pair of LegalizeAction
/// that indicates how instruction selection should deal with the load /
/// store.
///
/// The first dimension is the value_type for the reference. The second
/// dimension represents the various modes for load store.
uint8_t IndexedModeActions[MVT::LAST_VALUETYPE][ISD::LAST_INDEXED_MODE];
/// For each condition code (ISD::CondCode) keep a LegalizeAction that
/// indicates how instruction selection should deal with the condition code.
///
/// Because each CC action takes up 2 bits, we need to have the array size be
/// large enough to fit all of the value types. This can be done by rounding
/// up the MVT::LAST_VALUETYPE value to the next multiple of 16.
uint32_t CondCodeActions[ISD::SETCC_INVALID][(MVT::LAST_VALUETYPE + 15) / 16];
ValueTypeActionImpl ValueTypeActions;
private:
LegalizeKind getTypeConversion(LLVMContext &Context, EVT VT) const;
private:
std::vector<std::pair<MVT, const TargetRegisterClass*> > AvailableRegClasses;
/// Targets can specify ISD nodes that they would like PerformDAGCombine
/// callbacks for by calling setTargetDAGCombine(), which sets a bit in this
/// array.
unsigned char
TargetDAGCombineArray[(ISD::BUILTIN_OP_END+CHAR_BIT-1)/CHAR_BIT];
/// For operations that must be promoted to a specific type, this holds the
/// destination type. This map should be sparse, so don't hold it as an
/// array.
///
/// Targets add entries to this map with AddPromotedToType(..), clients access
/// this with getTypeToPromoteTo(..).
std::map<std::pair<unsigned, MVT::SimpleValueType>, MVT::SimpleValueType>
PromoteToType;
/// Stores the name each libcall.
const char *LibcallRoutineNames[RTLIB::UNKNOWN_LIBCALL];
/// The ISD::CondCode that should be used to test the result of each of the
/// comparison libcall against zero.
ISD::CondCode CmpLibcallCCs[RTLIB::UNKNOWN_LIBCALL];
/// Stores the CallingConv that should be used for each libcall.
CallingConv::ID LibcallCallingConvs[RTLIB::UNKNOWN_LIBCALL];
protected:
/// Return true if the extension represented by \p I is free.
/// \pre \p I is a sign, zero, or fp extension and
/// is[Z|FP]ExtFree of the related types is not true.
virtual bool isExtFreeImpl(const Instruction *I) const { return false; }
/// \brief Specify maximum number of store instructions per memset call.
///
/// When lowering \@llvm.memset this field specifies the maximum number of
/// store operations that may be substituted for the call to memset. Targets
/// must set this value based on the cost threshold for that target. Targets
/// should assume that the memset will be done using as many of the largest
/// store operations first, followed by smaller ones, if necessary, per
/// alignment restrictions. For example, storing 9 bytes on a 32-bit machine
/// with 16-bit alignment would result in four 2-byte stores and one 1-byte
/// store. This only applies to setting a constant array of a constant size.
unsigned MaxStoresPerMemset;
/// Maximum number of stores operations that may be substituted for the call
/// to memset, used for functions with OptSize attribute.
unsigned MaxStoresPerMemsetOptSize;
/// \brief Specify maximum bytes of store instructions per memcpy call.
///
/// When lowering \@llvm.memcpy this field specifies the maximum number of
/// store operations that may be substituted for a call to memcpy. Targets
/// must set this value based on the cost threshold for that target. Targets
/// should assume that the memcpy will be done using as many of the largest
/// store operations first, followed by smaller ones, if necessary, per
/// alignment restrictions. For example, storing 7 bytes on a 32-bit machine
/// with 32-bit alignment would result in one 4-byte store, a one 2-byte store
/// and one 1-byte store. This only applies to copying a constant array of
/// constant size.
unsigned MaxStoresPerMemcpy;
/// Maximum number of store operations that may be substituted for a call to
/// memcpy, used for functions with OptSize attribute.
unsigned MaxStoresPerMemcpyOptSize;
/// \brief Specify maximum bytes of store instructions per memmove call.
///
/// When lowering \@llvm.memmove this field specifies the maximum number of
/// store instructions that may be substituted for a call to memmove. Targets
/// must set this value based on the cost threshold for that target. Targets
/// should assume that the memmove will be done using as many of the largest
/// store operations first, followed by smaller ones, if necessary, per
/// alignment restrictions. For example, moving 9 bytes on a 32-bit machine
/// with 8-bit alignment would result in nine 1-byte stores. This only
/// applies to copying a constant array of constant size.
unsigned MaxStoresPerMemmove;
/// Maximum number of store instructions that may be substituted for a call to
/// memmove, used for functions with OpSize attribute.
unsigned MaxStoresPerMemmoveOptSize;
/// Tells the code generator that select is more expensive than a branch if
/// the branch is usually predicted right.
bool PredictableSelectIsExpensive;
/// MaskAndBranchFoldingIsLegal - Indicates if the target supports folding
/// a mask of a single bit, a compare, and a branch into a single instruction.
bool MaskAndBranchFoldingIsLegal;
/// \see enableExtLdPromotion.
bool EnableExtLdPromotion;
protected:
/// Return true if the value types that can be represented by the specified
/// register class are all legal.
bool isLegalRC(const TargetRegisterClass *RC) const;
/// Replace/modify any TargetFrameIndex operands with a targte-dependent
/// sequence of memory operands that is recognized by PrologEpilogInserter.
MachineBasicBlock *emitPatchPoint(MachineInstr *MI, MachineBasicBlock *MBB) const;
};
/// This class defines information used to lower LLVM code to legal SelectionDAG
/// operators that the target instruction selector can accept natively.
///
/// This class also defines callbacks that targets must implement to lower
/// target-specific constructs to SelectionDAG operators.
class TargetLowering : public TargetLoweringBase {
TargetLowering(const TargetLowering&) = delete;
void operator=(const TargetLowering&) = delete;
public:
/// NOTE: The TargetMachine owns TLOF.
explicit TargetLowering(const TargetMachine &TM);
/// Returns true by value, base pointer and offset pointer and addressing mode
/// by reference if the node's address can be legally represented as
/// pre-indexed load / store address.
virtual bool getPreIndexedAddressParts(SDNode * /*N*/, SDValue &/*Base*/,
SDValue &/*Offset*/,
ISD::MemIndexedMode &/*AM*/,
SelectionDAG &/*DAG*/) const {
return false;
}
/// Returns true by value, base pointer and offset pointer and addressing mode
/// by reference if this node can be combined with a load / store to form a
/// post-indexed load / store.
virtual bool getPostIndexedAddressParts(SDNode * /*N*/, SDNode * /*Op*/,
SDValue &/*Base*/,
SDValue &/*Offset*/,
ISD::MemIndexedMode &/*AM*/,
SelectionDAG &/*DAG*/) const {
return false;
}
/// Return the entry encoding for a jump table in the current function. The
/// returned value is a member of the MachineJumpTableInfo::JTEntryKind enum.
virtual unsigned getJumpTableEncoding() const;
virtual const MCExpr *
LowerCustomJumpTableEntry(const MachineJumpTableInfo * /*MJTI*/,
const MachineBasicBlock * /*MBB*/, unsigned /*uid*/,
MCContext &/*Ctx*/) const {
llvm_unreachable("Need to implement this hook if target has custom JTIs");
}
/// Returns relocation base for the given PIC jumptable.
virtual SDValue getPICJumpTableRelocBase(SDValue Table,
SelectionDAG &DAG) const;
/// This returns the relocation base for the given PIC jumptable, the same as
/// getPICJumpTableRelocBase, but as an MCExpr.
virtual const MCExpr *
getPICJumpTableRelocBaseExpr(const MachineFunction *MF,
unsigned JTI, MCContext &Ctx) const;
/// Return true if folding a constant offset with the given GlobalAddress is
/// legal. It is frequently not legal in PIC relocation models.
virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
bool isInTailCallPosition(SelectionDAG &DAG, SDNode *Node,
SDValue &Chain) const;
void softenSetCCOperands(SelectionDAG &DAG, EVT VT,
SDValue &NewLHS, SDValue &NewRHS,
ISD::CondCode &CCCode, SDLoc DL) const;
/// Returns a pair of (return value, chain).
/// It is an error to pass RTLIB::UNKNOWN_LIBCALL as \p LC.
std::pair<SDValue, SDValue> makeLibCall(SelectionDAG &DAG, RTLIB::Libcall LC,
EVT RetVT, const SDValue *Ops,
unsigned NumOps, bool isSigned,
SDLoc dl, bool doesNotReturn = false,
bool isReturnValueUsed = true) const;
//===--------------------------------------------------------------------===//
// TargetLowering Optimization Methods
//
/// A convenience struct that encapsulates a DAG, and two SDValues for
/// returning information from TargetLowering to its clients that want to
/// combine.
struct TargetLoweringOpt {
SelectionDAG &DAG;
bool LegalTys;
bool LegalOps;
SDValue Old;
SDValue New;
explicit TargetLoweringOpt(SelectionDAG &InDAG,
bool LT, bool LO) :
DAG(InDAG), LegalTys(LT), LegalOps(LO) {}
bool LegalTypes() const { return LegalTys; }
bool LegalOperations() const { return LegalOps; }
bool CombineTo(SDValue O, SDValue N) {
Old = O;
New = N;
return true;
}
/// Check to see if the specified operand of the specified instruction is a
/// constant integer. If so, check to see if there are any bits set in the
/// constant that are not demanded. If so, shrink the constant and return
/// true.
bool ShrinkDemandedConstant(SDValue Op, const APInt &Demanded);
/// Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free. This
/// uses isZExtFree and ZERO_EXTEND for the widening cast, but it could be
/// generalized for targets with other types of implicit widening casts.
bool ShrinkDemandedOp(SDValue Op, unsigned BitWidth, const APInt &Demanded,
SDLoc dl);
};
/// Look at Op. At this point, we know that only the DemandedMask bits of the
/// result of Op are ever used downstream. If we can use this information to
/// simplify Op, create a new simplified DAG node and return true, returning
/// the original and new nodes in Old and New. Otherwise, analyze the
/// expression and return a mask of KnownOne and KnownZero bits for the
/// expression (used to simplify the caller). The KnownZero/One bits may only
/// be accurate for those bits in the DemandedMask.
bool SimplifyDemandedBits(SDValue Op, const APInt &DemandedMask,
APInt &KnownZero, APInt &KnownOne,
TargetLoweringOpt &TLO, unsigned Depth = 0) const;
/// Determine which of the bits specified in Mask are known to be either zero
/// or one and return them in the KnownZero/KnownOne bitsets.
virtual void computeKnownBitsForTargetNode(const SDValue Op,
APInt &KnownZero,
APInt &KnownOne,
const SelectionDAG &DAG,
unsigned Depth = 0) const;
/// This method can be implemented by targets that want to expose additional
/// information about sign bits to the DAG Combiner.
virtual unsigned ComputeNumSignBitsForTargetNode(SDValue Op,
const SelectionDAG &DAG,
unsigned Depth = 0) const;
struct DAGCombinerInfo {
void *DC; // The DAG Combiner object.
CombineLevel Level;
bool CalledByLegalizer;
public:
SelectionDAG &DAG;
DAGCombinerInfo(SelectionDAG &dag, CombineLevel level, bool cl, void *dc)
: DC(dc), Level(level), CalledByLegalizer(cl), DAG(dag) {}
bool isBeforeLegalize() const { return Level == BeforeLegalizeTypes; }
bool isBeforeLegalizeOps() const { return Level < AfterLegalizeVectorOps; }
bool isAfterLegalizeVectorOps() const {
return Level == AfterLegalizeDAG;
}
CombineLevel getDAGCombineLevel() { return Level; }
bool isCalledByLegalizer() const { return CalledByLegalizer; }
void AddToWorklist(SDNode *N);
void RemoveFromWorklist(SDNode *N);
SDValue CombineTo(SDNode *N, ArrayRef<SDValue> To, bool AddTo = true);
SDValue CombineTo(SDNode *N, SDValue Res, bool AddTo = true);
SDValue CombineTo(SDNode *N, SDValue Res0, SDValue Res1, bool AddTo = true);
void CommitTargetLoweringOpt(const TargetLoweringOpt &TLO);
};
/// Return if the N is a constant or constant vector equal to the true value
/// from getBooleanContents().
bool isConstTrueVal(const SDNode *N) const;
/// Return if the N is a constant or constant vector equal to the false value
/// from getBooleanContents().
bool isConstFalseVal(const SDNode *N) const;
/// Try to simplify a setcc built with the specified operands and cc. If it is
/// unable to simplify it, return a null SDValue.
SDValue SimplifySetCC(EVT VT, SDValue N0, SDValue N1,
ISD::CondCode Cond, bool foldBooleans,
DAGCombinerInfo &DCI, SDLoc dl) const;
/// Returns true (and the GlobalValue and the offset) if the node is a
/// GlobalAddress + offset.
virtual bool
isGAPlusOffset(SDNode *N, const GlobalValue* &GA, int64_t &Offset) const;
/// This method will be invoked for all target nodes and for any
/// target-independent nodes that the target has registered with invoke it
/// for.
///
/// The semantics are as follows:
/// Return Value:
/// SDValue.Val == 0 - No change was made
/// SDValue.Val == N - N was replaced, is dead, and is already handled.
/// otherwise - N should be replaced by the returned Operand.
///
/// In addition, methods provided by DAGCombinerInfo may be used to perform
/// more complex transformations.
///
virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
/// Return true if it is profitable to move a following shift through this
// node, adjusting any immediate operands as necessary to preserve semantics.
// This transformation may not be desirable if it disrupts a particularly
// auspicious target-specific tree (e.g. bitfield extraction in AArch64).
// By default, it returns true.
virtual bool isDesirableToCommuteWithShift(const SDNode *N /*Op*/) const {
return true;
}
/// Return true if the target has native support for the specified value type
/// and it is 'desirable' to use the type for the given node type. e.g. On x86
/// i16 is legal, but undesirable since i16 instruction encodings are longer
/// and some i16 instructions are slow.
virtual bool isTypeDesirableForOp(unsigned /*Opc*/, EVT VT) const {
// By default, assume all legal types are desirable.
return isTypeLegal(VT);
}
/// Return true if it is profitable for dag combiner to transform a floating
/// point op of specified opcode to a equivalent op of an integer
/// type. e.g. f32 load -> i32 load can be profitable on ARM.
virtual bool isDesirableToTransformToIntegerOp(unsigned /*Opc*/,
EVT /*VT*/) const {
return false;
}
/// This method query the target whether it is beneficial for dag combiner to
/// promote the specified node. If true, it should return the desired
/// promotion type by reference.
virtual bool IsDesirableToPromoteOp(SDValue /*Op*/, EVT &/*PVT*/) const {
return false;
}
//===--------------------------------------------------------------------===//
// Lowering methods - These methods must be implemented by targets so that
// the SelectionDAGBuilder code knows how to lower these.
//
/// This hook must be implemented to lower the incoming (formal) arguments,
/// described by the Ins array, into the specified DAG. The implementation
/// should fill in the InVals array with legal-type argument values, and
/// return the resulting token chain value.
///
virtual SDValue
LowerFormalArguments(SDValue /*Chain*/, CallingConv::ID /*CallConv*/,
bool /*isVarArg*/,
const SmallVectorImpl<ISD::InputArg> &/*Ins*/,
SDLoc /*dl*/, SelectionDAG &/*DAG*/,
SmallVectorImpl<SDValue> &/*InVals*/) const {
llvm_unreachable("Not Implemented");
}
struct ArgListEntry {
SDValue Node;
Type* Ty;
bool isSExt : 1;
bool isZExt : 1;
bool isInReg : 1;
bool isSRet : 1;
bool isNest : 1;
bool isByVal : 1;
bool isInAlloca : 1;
bool isReturned : 1;
uint16_t Alignment;
ArgListEntry() : isSExt(false), isZExt(false), isInReg(false),
isSRet(false), isNest(false), isByVal(false), isInAlloca(false),
isReturned(false), Alignment(0) { }
void setAttributes(ImmutableCallSite *CS, unsigned AttrIdx);
};
typedef std::vector<ArgListEntry> ArgListTy;
/// This structure contains all information that is necessary for lowering
/// calls. It is passed to TLI::LowerCallTo when the SelectionDAG builder
/// needs to lower a call, and targets will see this struct in their LowerCall
/// implementation.
struct CallLoweringInfo {
SDValue Chain;
Type *RetTy;
bool RetSExt : 1;
bool RetZExt : 1;
bool IsVarArg : 1;
bool IsInReg : 1;
bool DoesNotReturn : 1;
bool IsReturnValueUsed : 1;
// IsTailCall should be modified by implementations of
// TargetLowering::LowerCall that perform tail call conversions.
bool IsTailCall;
unsigned NumFixedArgs;
CallingConv::ID CallConv;
SDValue Callee;
ArgListTy Args;
SelectionDAG &DAG;
SDLoc DL;
ImmutableCallSite *CS;
bool IsPatchPoint;
SmallVector<ISD::OutputArg, 32> Outs;
SmallVector<SDValue, 32> OutVals;
SmallVector<ISD::InputArg, 32> Ins;
CallLoweringInfo(SelectionDAG &DAG)
: RetTy(nullptr), RetSExt(false), RetZExt(false), IsVarArg(false),
IsInReg(false), DoesNotReturn(false), IsReturnValueUsed(true),
IsTailCall(false), NumFixedArgs(-1), CallConv(CallingConv::C),
DAG(DAG), CS(nullptr), IsPatchPoint(false) {}
CallLoweringInfo &setDebugLoc(SDLoc dl) {
DL = dl;
return *this;
}
CallLoweringInfo &setChain(SDValue InChain) {
Chain = InChain;
return *this;
}
CallLoweringInfo &setCallee(CallingConv::ID CC, Type *ResultType,
SDValue Target, ArgListTy &&ArgsList,
unsigned FixedArgs = -1) {
RetTy = ResultType;
Callee = Target;
CallConv = CC;
NumFixedArgs =
(FixedArgs == static_cast<unsigned>(-1) ? Args.size() : FixedArgs);
Args = std::move(ArgsList);
return *this;
}
CallLoweringInfo &setCallee(Type *ResultType, FunctionType *FTy,
SDValue Target, ArgListTy &&ArgsList,
ImmutableCallSite &Call) {
RetTy = ResultType;
IsInReg = Call.paramHasAttr(0, Attribute::InReg);
DoesNotReturn = Call.doesNotReturn();
IsVarArg = FTy->isVarArg();
IsReturnValueUsed = !Call.getInstruction()->use_empty();
RetSExt = Call.paramHasAttr(0, Attribute::SExt);
RetZExt = Call.paramHasAttr(0, Attribute::ZExt);
Callee = Target;
CallConv = Call.getCallingConv();
NumFixedArgs = FTy->getNumParams();
Args = std::move(ArgsList);
CS = &Call;
return *this;
}
CallLoweringInfo &setInRegister(bool Value = true) {
IsInReg = Value;
return *this;
}
CallLoweringInfo &setNoReturn(bool Value = true) {
DoesNotReturn = Value;
return *this;
}
CallLoweringInfo &setVarArg(bool Value = true) {
IsVarArg = Value;
return *this;
}
CallLoweringInfo &setTailCall(bool Value = true) {
IsTailCall = Value;
return *this;
}
CallLoweringInfo &setDiscardResult(bool Value = true) {
IsReturnValueUsed = !Value;
return *this;
}
CallLoweringInfo &setSExtResult(bool Value = true) {
RetSExt = Value;
return *this;
}
CallLoweringInfo &setZExtResult(bool Value = true) {
RetZExt = Value;
return *this;
}
CallLoweringInfo &setIsPatchPoint(bool Value = true) {
IsPatchPoint = Value;
return *this;
}
ArgListTy &getArgs() {
return Args;
}
};
/// This function lowers an abstract call to a function into an actual call.
/// This returns a pair of operands. The first element is the return value
/// for the function (if RetTy is not VoidTy). The second element is the
/// outgoing token chain. It calls LowerCall to do the actual lowering.
std::pair<SDValue, SDValue> LowerCallTo(CallLoweringInfo &CLI) const;
/// This hook must be implemented to lower calls into the the specified
/// DAG. The outgoing arguments to the call are described by the Outs array,
/// and the values to be returned by the call are described by the Ins
/// array. The implementation should fill in the InVals array with legal-type
/// return values from the call, and return the resulting token chain value.
virtual SDValue
LowerCall(CallLoweringInfo &/*CLI*/,
SmallVectorImpl<SDValue> &/*InVals*/) const {
llvm_unreachable("Not Implemented");
}
/// Target-specific cleanup for formal ByVal parameters.
virtual void HandleByVal(CCState *, unsigned &, unsigned) const {}
/// This hook should be implemented to check whether the return values
/// described by the Outs array can fit into the return registers. If false
/// is returned, an sret-demotion is performed.
virtual bool CanLowerReturn(CallingConv::ID /*CallConv*/,
MachineFunction &/*MF*/, bool /*isVarArg*/,
const SmallVectorImpl<ISD::OutputArg> &/*Outs*/,
LLVMContext &/*Context*/) const
{
// Return true by default to get preexisting behavior.
return true;
}
/// This hook must be implemented to lower outgoing return values, described
/// by the Outs array, into the specified DAG. The implementation should
/// return the resulting token chain value.
virtual SDValue
LowerReturn(SDValue /*Chain*/, CallingConv::ID /*CallConv*/,
bool /*isVarArg*/,
const SmallVectorImpl<ISD::OutputArg> &/*Outs*/,
const SmallVectorImpl<SDValue> &/*OutVals*/,
SDLoc /*dl*/, SelectionDAG &/*DAG*/) const {
llvm_unreachable("Not Implemented");
}
/// Return true if result of the specified node is used by a return node
/// only. It also compute and return the input chain for the tail call.
///
/// This is used to determine whether it is possible to codegen a libcall as
/// tail call at legalization time.
virtual bool isUsedByReturnOnly(SDNode *, SDValue &/*Chain*/) const {
return false;
}
/// Return true if the target may be able emit the call instruction as a tail
/// call. This is used by optimization passes to determine if it's profitable
/// to duplicate return instructions to enable tailcall optimization.
virtual bool mayBeEmittedAsTailCall(CallInst *) const {
return false;
}
/// Return the builtin name for the __builtin___clear_cache intrinsic
/// Default is to invoke the clear cache library call
virtual const char * getClearCacheBuiltinName() const {
return "__clear_cache";
}
/// Return the register ID of the name passed in. Used by named register
/// global variables extension. There is no target-independent behaviour
/// so the default action is to bail.
virtual unsigned getRegisterByName(const char* RegName, EVT VT) const {
report_fatal_error("Named registers not implemented for this target");
}
/// Return the type that should be used to zero or sign extend a
/// zeroext/signext integer argument or return value. FIXME: Most C calling
/// convention requires the return type to be promoted, but this is not true
/// all the time, e.g. i1 on x86-64. It is also not necessary for non-C
/// calling conventions. The frontend should handle this and include all of
/// the necessary information.
virtual EVT getTypeForExtArgOrReturn(LLVMContext &Context, EVT VT,
ISD::NodeType /*ExtendKind*/) const {
EVT MinVT = getRegisterType(Context, MVT::i32);
return VT.bitsLT(MinVT) ? MinVT : VT;
}
/// For some targets, an LLVM struct type must be broken down into multiple
/// simple types, but the calling convention specifies that the entire struct
/// must be passed in a block of consecutive registers.
virtual bool
functionArgumentNeedsConsecutiveRegisters(Type *Ty, CallingConv::ID CallConv,
bool isVarArg) const {
return false;
}
/// Returns a 0 terminated array of registers that can be safely used as
/// scratch registers.
virtual const MCPhysReg *getScratchRegisters(CallingConv::ID CC) const {
return nullptr;
}
/// This callback is used to prepare for a volatile or atomic load.
/// It takes a chain node as input and returns the chain for the load itself.
///
/// Having a callback like this is necessary for targets like SystemZ,
/// which allows a CPU to reuse the result of a previous load indefinitely,
/// even if a cache-coherent store is performed by another CPU. The default
/// implementation does nothing.
virtual SDValue prepareVolatileOrAtomicLoad(SDValue Chain, SDLoc DL,
SelectionDAG &DAG) const {
return Chain;
}
/// This callback is invoked by the type legalizer to legalize nodes with an
/// illegal operand type but legal result types. It replaces the
/// LowerOperation callback in the type Legalizer. The reason we can not do
/// away with LowerOperation entirely is that LegalizeDAG isn't yet ready to
/// use this callback.
///
/// TODO: Consider merging with ReplaceNodeResults.
///
/// The target places new result values for the node in Results (their number
/// and types must exactly match those of the original return values of
/// the node), or leaves Results empty, which indicates that the node is not
/// to be custom lowered after all.
/// The default implementation calls LowerOperation.
virtual void LowerOperationWrapper(SDNode *N,
SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) const;
/// This callback is invoked for operations that are unsupported by the
/// target, which are registered to use 'custom' lowering, and whose defined
/// values are all legal. If the target has no operations that require custom
/// lowering, it need not implement this. The default implementation of this
/// aborts.
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
/// This callback is invoked when a node result type is illegal for the
/// target, and the operation was registered to use 'custom' lowering for that
/// result type. The target places new result values for the node in Results
/// (their number and types must exactly match those of the original return
/// values of the node), or leaves Results empty, which indicates that the
/// node is not to be custom lowered after all.
///
/// If the target has no operations that require custom lowering, it need not
/// implement this. The default implementation aborts.
virtual void ReplaceNodeResults(SDNode * /*N*/,
SmallVectorImpl<SDValue> &/*Results*/,
SelectionDAG &/*DAG*/) const {
llvm_unreachable("ReplaceNodeResults not implemented for this target!");
}
/// This method returns the name of a target specific DAG node.
virtual const char *getTargetNodeName(unsigned Opcode) const;
/// This method returns a target specific FastISel object, or null if the
/// target does not support "fast" ISel.
virtual FastISel *createFastISel(FunctionLoweringInfo &,
const TargetLibraryInfo *) const {
return nullptr;
}
bool verifyReturnAddressArgumentIsConstant(SDValue Op,
SelectionDAG &DAG) const;
//===--------------------------------------------------------------------===//
// Inline Asm Support hooks
//
/// This hook allows the target to expand an inline asm call to be explicit
/// llvm code if it wants to. This is useful for turning simple inline asms
/// into LLVM intrinsics, which gives the compiler more information about the
/// behavior of the code.
virtual bool ExpandInlineAsm(CallInst *) const {
return false;
}
enum ConstraintType {
C_Register, // Constraint represents specific register(s).
C_RegisterClass, // Constraint represents any of register(s) in class.
C_Memory, // Memory constraint.
C_Other, // Something else.
C_Unknown // Unsupported constraint.
};
enum ConstraintWeight {
// Generic weights.
CW_Invalid = -1, // No match.
CW_Okay = 0, // Acceptable.
CW_Good = 1, // Good weight.
CW_Better = 2, // Better weight.
CW_Best = 3, // Best weight.
// Well-known weights.
CW_SpecificReg = CW_Okay, // Specific register operands.
CW_Register = CW_Good, // Register operands.
CW_Memory = CW_Better, // Memory operands.
CW_Constant = CW_Best, // Constant operand.
CW_Default = CW_Okay // Default or don't know type.
};
/// This contains information for each constraint that we are lowering.
struct AsmOperandInfo : public InlineAsm::ConstraintInfo {
/// This contains the actual string for the code, like "m". TargetLowering
/// picks the 'best' code from ConstraintInfo::Codes that most closely
/// matches the operand.
std::string ConstraintCode;
/// Information about the constraint code, e.g. Register, RegisterClass,
/// Memory, Other, Unknown.
TargetLowering::ConstraintType ConstraintType;
/// If this is the result output operand or a clobber, this is null,
/// otherwise it is the incoming operand to the CallInst. This gets
/// modified as the asm is processed.
Value *CallOperandVal;
/// The ValueType for the operand value.
MVT ConstraintVT;
/// Return true of this is an input operand that is a matching constraint
/// like "4".
bool isMatchingInputConstraint() const;
/// If this is an input matching constraint, this method returns the output
/// operand it matches.
unsigned getMatchedOperand() const;
/// Copy constructor for copying from a ConstraintInfo.
AsmOperandInfo(InlineAsm::ConstraintInfo Info)
: InlineAsm::ConstraintInfo(std::move(Info)),
ConstraintType(TargetLowering::C_Unknown), CallOperandVal(nullptr),
ConstraintVT(MVT::Other) {}
};
typedef std::vector<AsmOperandInfo> AsmOperandInfoVector;
/// Split up the constraint string from the inline assembly value into the
/// specific constraints and their prefixes, and also tie in the associated
/// operand values. If this returns an empty vector, and if the constraint
/// string itself isn't empty, there was an error parsing.
virtual AsmOperandInfoVector ParseConstraints(const TargetRegisterInfo *TRI,
ImmutableCallSite CS) const;
/// Examine constraint type and operand type and determine a weight value.
/// The operand object must already have been set up with the operand type.
virtual ConstraintWeight getMultipleConstraintMatchWeight(
AsmOperandInfo &info, int maIndex) const;
/// Examine constraint string and operand type and determine a weight value.
/// The operand object must already have been set up with the operand type.
virtual ConstraintWeight getSingleConstraintMatchWeight(
AsmOperandInfo &info, const char *constraint) const;
/// Determines the constraint code and constraint type to use for the specific
/// AsmOperandInfo, setting OpInfo.ConstraintCode and OpInfo.ConstraintType.
/// If the actual operand being passed in is available, it can be passed in as
/// Op, otherwise an empty SDValue can be passed.
virtual void ComputeConstraintToUse(AsmOperandInfo &OpInfo,
SDValue Op,
SelectionDAG *DAG = nullptr) const;
/// Given a constraint, return the type of constraint it is for this target.
virtual ConstraintType getConstraintType(const std::string &Constraint) const;
/// Given a physical register constraint (e.g. {edx}), return the register
/// number and the register class for the register.
///
/// Given a register class constraint, like 'r', if this corresponds directly
/// to an LLVM register class, return a register of 0 and the register class
/// pointer.
///
/// This should only be used for C_Register constraints. On error, this
/// returns a register number of 0 and a null register class pointer.
virtual std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
const std::string &Constraint, MVT VT) const;
virtual unsigned
getInlineAsmMemConstraint(const std::string &ConstraintCode) const {
if (ConstraintCode == "i")
return InlineAsm::Constraint_i;
else if (ConstraintCode == "m")
return InlineAsm::Constraint_m;
return InlineAsm::Constraint_Unknown;
}
/// Try to replace an X constraint, which matches anything, with another that
/// has more specific requirements based on the type of the corresponding
/// operand. This returns null if there is no replacement to make.
virtual const char *LowerXConstraint(EVT ConstraintVT) const;
/// Lower the specified operand into the Ops vector. If it is invalid, don't
/// add anything to Ops.
virtual void LowerAsmOperandForConstraint(SDValue Op, std::string &Constraint,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) const;
//===--------------------------------------------------------------------===//
// Div utility functions
//
SDValue BuildExactSDIV(SDValue Op1, SDValue Op2, SDLoc dl,
SelectionDAG &DAG) const;
SDValue BuildSDIV(SDNode *N, const APInt &Divisor, SelectionDAG &DAG,
bool IsAfterLegalization,
std::vector<SDNode *> *Created) const;
SDValue BuildUDIV(SDNode *N, const APInt &Divisor, SelectionDAG &DAG,
bool IsAfterLegalization,
std::vector<SDNode *> *Created) const;
virtual SDValue BuildSDIVPow2(SDNode *N, const APInt &Divisor,
SelectionDAG &DAG,
std::vector<SDNode *> *Created) const {
return SDValue();
}
/// Indicate whether this target prefers to combine the given number of FDIVs
/// with the same divisor.
virtual bool combineRepeatedFPDivisors(unsigned NumUsers) const {
return false;
}
/// Hooks for building estimates in place of slower divisions and square
/// roots.
/// Return a reciprocal square root estimate value for the input operand.
/// The RefinementSteps output is the number of Newton-Raphson refinement