#include "llvm/Target/TargetLowering.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"
-#include "llvm/Target/TargetData.h"
+#include "llvm/DataLayout.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include <cctype>
using namespace llvm;
-/// We are in the process of implementing a new TypeLegalization action
-/// - the promotion of vector elements. This feature is disabled by default
-/// and only enabled using this flag.
-static cl::opt<bool>
-AllowPromoteIntElem("promote-elements", cl::Hidden, cl::init(true),
- cl::desc("Allow promotion of integer vector element types"));
-
/// InitLibcallNames - Set default libcall names.
///
static void InitLibcallNames(const char **Names) {
/// NOTE: The constructor takes ownership of TLOF.
TargetLowering::TargetLowering(const TargetMachine &tm,
const TargetLoweringObjectFile *tlof)
- : TM(tm), TD(TM.getTargetData()), TLOF(*tlof),
- mayPromoteElements(AllowPromoteIntElem) {
+ : TM(tm), TD(TM.getDataLayout()), TLOF(*tlof) {
// All operations default to being supported.
memset(OpActions, 0, sizeof(OpActions));
memset(LoadExtActions, 0, sizeof(LoadExtActions));
setOperationAction(ISD::TRAP, MVT::Other, Expand);
IsLittleEndian = TD->isLittleEndian();
- PointerTy = MVT::getIntegerVT(8*TD->getPointerSize());
+ PointerTy = MVT::getIntegerVT(8*TD->getPointerSize(0));
memset(RegClassForVT, 0,MVT::LAST_VALUETYPE*sizeof(TargetRegisterClass*));
memset(TargetDAGCombineArray, 0, array_lengthof(TargetDAGCombineArray));
maxStoresPerMemset = maxStoresPerMemcpy = maxStoresPerMemmove = 8;
IntDivIsCheap = false;
Pow2DivIsCheap = false;
JumpIsExpensive = false;
+ predictableSelectIsExpensive = false;
StackPointerRegisterToSaveRestore = 0;
ExceptionPointerRegister = 0;
ExceptionSelectorRegister = 0;
MinStackArgumentAlignment = 1;
ShouldFoldAtomicFences = false;
InsertFencesForAtomic = false;
+ SupportJumpTables = true;
+ MinimumJumpTableEntries = 4;
InitLibcallNames(LibcallRoutineNames);
InitCmpLibcallCCs(CmpLibcallCCs);
}
MVT TargetLowering::getShiftAmountTy(EVT LHSTy) const {
- return MVT::getIntegerVT(8*TD->getPointerSize());
+ return MVT::getIntegerVT(8*TD->getPointerSize(0));
}
/// canOpTrap - Returns true if the operation can trap for the value type.
return false;
}
-/// hasLegalSuperRegRegClasses - Return true if the specified register class
-/// has one or more super-reg register classes that are legal.
-bool
-TargetLowering::hasLegalSuperRegRegClasses(const TargetRegisterClass *RC) const{
- if (*RC->superregclasses_begin() == 0)
- return false;
- for (TargetRegisterInfo::regclass_iterator I = RC->superregclasses_begin(),
- E = RC->superregclasses_end(); I != E; ++I) {
- const TargetRegisterClass *RRC = *I;
- if (isLegalRC(RRC))
- return true;
- }
- return false;
-}
-
/// findRepresentativeClass - Return the largest legal super-reg register class
/// of the register class for the specified type and its associated "cost".
std::pair<const TargetRegisterClass*, uint8_t>
TargetLowering::findRepresentativeClass(EVT VT) const {
+ const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
const TargetRegisterClass *RC = RegClassForVT[VT.getSimpleVT().SimpleTy];
if (!RC)
return std::make_pair(RC, 0);
+
+ // Compute the set of all super-register classes.
+ BitVector SuperRegRC(TRI->getNumRegClasses());
+ for (SuperRegClassIterator RCI(RC, TRI); RCI.isValid(); ++RCI)
+ SuperRegRC.setBitsInMask(RCI.getMask());
+
+ // Find the first legal register class with the largest spill size.
const TargetRegisterClass *BestRC = RC;
- for (TargetRegisterInfo::regclass_iterator I = RC->superregclasses_begin(),
- E = RC->superregclasses_end(); I != E; ++I) {
- const TargetRegisterClass *RRC = *I;
- if (RRC->isASubClass() || !isLegalRC(RRC))
+ for (int i = SuperRegRC.find_first(); i >= 0; i = SuperRegRC.find_next(i)) {
+ const TargetRegisterClass *SuperRC = TRI->getRegClass(i);
+ // We want the largest possible spill size.
+ if (SuperRC->getSize() <= BestRC->getSize())
continue;
- if (!hasLegalSuperRegRegClasses(RRC))
- return std::make_pair(RRC, 1);
- BestRC = RRC;
+ if (!isLegalRC(SuperRC))
+ continue;
+ BestRC = SuperRC;
}
return std::make_pair(BestRC, 1);
}
-
/// computeRegisterProperties - Once all of the register classes are added,
/// this allows us to compute derived properties we expose.
void TargetLowering::computeRegisterProperties() {
LegalIntReg = IntReg;
} else {
RegisterTypeForVT[IntReg] = TransformToType[IntReg] =
- (MVT::SimpleValueType)LegalIntReg;
+ (const MVT::SimpleValueType)LegalIntReg;
ValueTypeActions.setTypeAction(IVT, TypePromoteInteger);
}
}
unsigned NElts = VT.getVectorNumElements();
if (NElts != 1) {
bool IsLegalWiderType = false;
- // If we allow the promotion of vector elements using a flag,
- // then return TypePromoteInteger on vector elements.
// First try to promote the elements of integer vectors. If no legal
// promotion was found, fallback to the widen-vector method.
- if (mayPromoteElements)
for (unsigned nVT = i+1; nVT <= MVT::LAST_VECTOR_VALUETYPE; ++nVT) {
EVT SVT = (MVT::SimpleValueType)nVT;
// Promote vectors of integers to vectors with the same number
return NULL;
}
-
EVT TargetLowering::getSetCCResultType(EVT VT) const {
assert(!VT.isVector() && "No default SetCC type for vectors!");
- return PointerTy.SimpleTy;
+ return getPointerTy(0).SimpleTy;
}
MVT::SimpleValueType TargetLowering::getCmpLibcallReturnType() const {
/// TODO: Move this out of TargetLowering.cpp.
void llvm::GetReturnInfo(Type* ReturnType, Attributes attr,
SmallVectorImpl<ISD::OutputArg> &Outs,
- const TargetLowering &TLI,
- SmallVectorImpl<uint64_t> *Offsets) {
+ const TargetLowering &TLI) {
SmallVector<EVT, 4> ValueVTs;
ComputeValueVTs(TLI, ReturnType, ValueVTs);
unsigned NumValues = ValueVTs.size();
if (NumValues == 0) return;
- unsigned Offset = 0;
for (unsigned j = 0, f = NumValues; j != f; ++j) {
EVT VT = ValueVTs[j];
ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
- if (attr & Attribute::SExt)
+ if (attr.hasAttribute(Attributes::SExt))
ExtendKind = ISD::SIGN_EXTEND;
- else if (attr & Attribute::ZExt)
+ else if (attr.hasAttribute(Attributes::ZExt))
ExtendKind = ISD::ZERO_EXTEND;
// FIXME: C calling convention requires the return type to be promoted to
unsigned NumParts = TLI.getNumRegisters(ReturnType->getContext(), VT);
EVT PartVT = TLI.getRegisterType(ReturnType->getContext(), VT);
- unsigned PartSize = TLI.getTargetData()->getTypeAllocSize(
- PartVT.getTypeForEVT(ReturnType->getContext()));
// 'inreg' on function refers to return value
ISD::ArgFlagsTy Flags = ISD::ArgFlagsTy();
- if (attr & Attribute::InReg)
+ if (attr.hasAttribute(Attributes::InReg))
Flags.setInReg();
// Propagate extension type if any
- if (attr & Attribute::SExt)
+ if (attr.hasAttribute(Attributes::SExt))
Flags.setSExt();
- else if (attr & Attribute::ZExt)
+ else if (attr.hasAttribute(Attributes::ZExt))
Flags.setZExt();
- for (unsigned i = 0; i < NumParts; ++i) {
+ for (unsigned i = 0; i < NumParts; ++i)
Outs.push_back(ISD::OutputArg(Flags, PartVT, /*isFixed=*/true));
- if (Offsets) {
- Offsets->push_back(Offset);
- Offset += PartSize;
- }
- }
}
}
if ((JTEncoding == MachineJumpTableInfo::EK_GPRel64BlockAddress) ||
(JTEncoding == MachineJumpTableInfo::EK_GPRel32BlockAddress))
- return DAG.getGLOBAL_OFFSET_TABLE(getPointerTy());
+ return DAG.getGLOBAL_OFFSET_TABLE(getPointerTy(0));
return Table;
}
}
}
- // Make sure we're not loosing bits from the constant.
+ // Make sure we're not losing bits from the constant.
if (MinBits < C1.getBitWidth() && MinBits > C1.getActiveBits()) {
EVT MinVT = EVT::getIntegerVT(*DAG.getContext(), MinBits);
if (isTypeDesirableForOp(ISD::SETCC, MinVT)) {
N0.getOpcode() == ISD::AND)
if (ConstantSDNode *AndRHS =
dyn_cast<ConstantSDNode>(N0.getOperand(1))) {
- EVT ShiftTy = DCI.isBeforeLegalize() ?
+ EVT ShiftTy = DCI.isBeforeLegalizeOps() ?
getPointerTy() : getShiftAmountTy(N0.getValueType());
if (Cond == ISD::SETNE && C1 == 0) {// (X & 8) != 0 --> (X & 8) >> 3
// Perform the xform if the AND RHS is a single bit.
}
}
}
+
+ if (C1.getMinSignedBits() <= 64 &&
+ !isLegalICmpImmediate(C1.getSExtValue())) {
+ // (X & -256) == 256 -> (X >> 8) == 1
+ if ((Cond == ISD::SETEQ || Cond == ISD::SETNE) &&
+ N0.getOpcode() == ISD::AND && N0.hasOneUse()) {
+ if (ConstantSDNode *AndRHS =
+ dyn_cast<ConstantSDNode>(N0.getOperand(1))) {
+ const APInt &AndRHSC = AndRHS->getAPIntValue();
+ if ((-AndRHSC).isPowerOf2() && (AndRHSC & C1) == C1) {
+ unsigned ShiftBits = AndRHSC.countTrailingZeros();
+ EVT ShiftTy = DCI.isBeforeLegalizeOps() ?
+ getPointerTy() : getShiftAmountTy(N0.getValueType());
+ EVT CmpTy = N0.getValueType();
+ SDValue Shift = DAG.getNode(ISD::SRL, dl, CmpTy, N0.getOperand(0),
+ DAG.getConstant(ShiftBits, ShiftTy));
+ SDValue CmpRHS = DAG.getConstant(C1.lshr(ShiftBits), CmpTy);
+ return DAG.getSetCC(dl, VT, Shift, CmpRHS, Cond);
+ }
+ }
+ } else if (Cond == ISD::SETULT || Cond == ISD::SETUGE ||
+ Cond == ISD::SETULE || Cond == ISD::SETUGT) {
+ bool AdjOne = (Cond == ISD::SETULE || Cond == ISD::SETUGT);
+ // X < 0x100000000 -> (X >> 32) < 1
+ // X >= 0x100000000 -> (X >> 32) >= 1
+ // X <= 0x0ffffffff -> (X >> 32) < 1
+ // X > 0x0ffffffff -> (X >> 32) >= 1
+ unsigned ShiftBits;
+ APInt NewC = C1;
+ ISD::CondCode NewCond = Cond;
+ if (AdjOne) {
+ ShiftBits = C1.countTrailingOnes();
+ NewC = NewC + 1;
+ NewCond = (Cond == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
+ } else {
+ ShiftBits = C1.countTrailingZeros();
+ }
+ NewC = NewC.lshr(ShiftBits);
+ if (ShiftBits && isLegalICmpImmediate(NewC.getSExtValue())) {
+ EVT ShiftTy = DCI.isBeforeLegalizeOps() ?
+ getPointerTy() : getShiftAmountTy(N0.getValueType());
+ EVT CmpTy = N0.getValueType();
+ SDValue Shift = DAG.getNode(ISD::SRL, dl, CmpTy, N0,
+ DAG.getConstant(ShiftBits, ShiftTy));
+ SDValue CmpRHS = DAG.getConstant(NewC, CmpTy);
+ return DAG.getSetCC(dl, VT, Shift, CmpRHS, NewCond);
+ }
+ }
+ }
}
if (isa<ConstantFPSDNode>(N0.getNode())) {
}
if (N0 == N1) {
+ // The sext(setcc()) => setcc() optimization relies on the appropriate
+ // constant being emitted.
+ uint64_t EqVal = 0;
+ switch (getBooleanContents(N0.getValueType().isVector())) {
+ case UndefinedBooleanContent:
+ case ZeroOrOneBooleanContent:
+ EqVal = ISD::isTrueWhenEqual(Cond);
+ break;
+ case ZeroOrNegativeOneBooleanContent:
+ EqVal = ISD::isTrueWhenEqual(Cond) ? -1 : 0;
+ break;
+ }
+
// We can always fold X == X for integer setcc's.
if (N0.getValueType().isInteger()) {
- switch (getBooleanContents(N0.getValueType().isVector())) {
- case UndefinedBooleanContent:
- case ZeroOrOneBooleanContent:
- return DAG.getConstant(ISD::isTrueWhenEqual(Cond), VT);
- case ZeroOrNegativeOneBooleanContent:
- return DAG.getConstant(ISD::isTrueWhenEqual(Cond) ? -1 : 0, VT);
- }
+ return DAG.getConstant(EqVal, VT);
}
unsigned UOF = ISD::getUnorderedFlavor(Cond);
if (UOF == 2) // FP operators that are undefined on NaNs.
- return DAG.getConstant(ISD::isTrueWhenEqual(Cond), VT);
+ return DAG.getConstant(EqVal, VT);
if (UOF == unsigned(ISD::isTrueWhenEqual(Cond)))
- return DAG.getConstant(UOF, VT);
+ return DAG.getConstant(EqVal, VT);
// Otherwise, we can't fold it. However, we can simplify it to SETUO/SETO
// if it is not already.
ISD::CondCode NewCond = UOF == 0 ? ISD::SETO : ISD::SETUO;
- if (NewCond != Cond)
+ if (NewCond != Cond && (DCI.isBeforeLegalizeOps() ||
+ getCondCodeAction(NewCond, N0.getValueType()) == Legal))
return DAG.getSetCC(dl, VT, N0, N1, NewCond);
}
EVT::getEVT(IntegerType::get(OpTy->getContext(), BitSize), true);
break;
}
- } else if (dyn_cast<PointerType>(OpTy)) {
- OpInfo.ConstraintVT = MVT::getIntegerVT(8*TD->getPointerSize());
+ } else if (PointerType *PT = dyn_cast<PointerType>(OpTy)) {
+ OpInfo.ConstraintVT = MVT::getIntegerVT(
+ 8*TD->getPointerSize(PT->getAddressSpace()));
} else {
OpInfo.ConstraintVT = EVT::getEVT(OpTy, true);
}
AsmOperandInfo &Input = ConstraintOperands[OpInfo.MatchingInput];
if (OpInfo.ConstraintVT != Input.ConstraintVT) {
- std::pair<unsigned, const TargetRegisterClass*> MatchRC =
- getRegForInlineAsmConstraint(OpInfo.ConstraintCode, OpInfo.ConstraintVT);
- std::pair<unsigned, const TargetRegisterClass*> InputRC =
- getRegForInlineAsmConstraint(Input.ConstraintCode, Input.ConstraintVT);
+ std::pair<unsigned, const TargetRegisterClass*> MatchRC =
+ getRegForInlineAsmConstraint(OpInfo.ConstraintCode,
+ OpInfo.ConstraintVT);
+ std::pair<unsigned, const TargetRegisterClass*> InputRC =
+ getRegForInlineAsmConstraint(Input.ConstraintCode,
+ Input.ConstraintVT);
if ((OpInfo.ConstraintVT.isInteger() !=
Input.ConstraintVT.isInteger()) ||
(MatchRC.second != InputRC.second)) {
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