llvm-6502/lib/Target/ARM/ARMISelLowering.h
Evan Cheng 0c439eb2c8 Eliminate target hook IsEligibleForTailCallOptimization.
Target independent isel should always pass along the "tail call" property. Change
target hook LowerCall's parameter "isTailCall" into a refernce. If the target
decides it's impossible to honor the tail call request, it should set isTailCall
to false to make target independent isel happy.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94626 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-27 00:07:07 +00:00

349 lines
16 KiB
C++

//===-- ARMISelLowering.h - ARM DAG Lowering Interface ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that ARM uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef ARMISELLOWERING_H
#define ARMISELLOWERING_H
#include "ARMSubtarget.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include <vector>
namespace llvm {
class ARMConstantPoolValue;
namespace ARMISD {
// ARM Specific DAG Nodes
enum NodeType {
// Start the numbering where the builtin ops and target ops leave off.
FIRST_NUMBER = ISD::BUILTIN_OP_END,
Wrapper, // Wrapper - A wrapper node for TargetConstantPool,
// TargetExternalSymbol, and TargetGlobalAddress.
WrapperJT, // WrapperJT - A wrapper node for TargetJumpTable
CALL, // Function call.
CALL_PRED, // Function call that's predicable.
CALL_NOLINK, // Function call with branch not branch-and-link.
tCALL, // Thumb function call.
BRCOND, // Conditional branch.
BR_JT, // Jumptable branch.
BR2_JT, // Jumptable branch (2 level - jumptable entry is a jump).
RET_FLAG, // Return with a flag operand.
PIC_ADD, // Add with a PC operand and a PIC label.
CMP, // ARM compare instructions.
CMPZ, // ARM compare that sets only Z flag.
CMPFP, // ARM VFP compare instruction, sets FPSCR.
CMPFPw0, // ARM VFP compare against zero instruction, sets FPSCR.
FMSTAT, // ARM fmstat instruction.
CMOV, // ARM conditional move instructions.
CNEG, // ARM conditional negate instructions.
RBIT, // ARM bitreverse instruction
FTOSI, // FP to sint within a FP register.
FTOUI, // FP to uint within a FP register.
SITOF, // sint to FP within a FP register.
UITOF, // uint to FP within a FP register.
SRL_FLAG, // V,Flag = srl_flag X -> srl X, 1 + save carry out.
SRA_FLAG, // V,Flag = sra_flag X -> sra X, 1 + save carry out.
RRX, // V = RRX X, Flag -> srl X, 1 + shift in carry flag.
VMOVRRD, // double to two gprs.
VMOVDRR, // Two gprs to double.
EH_SJLJ_SETJMP, // SjLj exception handling setjmp.
EH_SJLJ_LONGJMP, // SjLj exception handling longjmp.
THREAD_POINTER,
DYN_ALLOC, // Dynamic allocation on the stack.
MEMBARRIER, // Memory barrier
SYNCBARRIER, // Memory sync barrier
VCEQ, // Vector compare equal.
VCGE, // Vector compare greater than or equal.
VCGEU, // Vector compare unsigned greater than or equal.
VCGT, // Vector compare greater than.
VCGTU, // Vector compare unsigned greater than.
VTST, // Vector test bits.
// Vector shift by immediate:
VSHL, // ...left
VSHRs, // ...right (signed)
VSHRu, // ...right (unsigned)
VSHLLs, // ...left long (signed)
VSHLLu, // ...left long (unsigned)
VSHLLi, // ...left long (with maximum shift count)
VSHRN, // ...right narrow
// Vector rounding shift by immediate:
VRSHRs, // ...right (signed)
VRSHRu, // ...right (unsigned)
VRSHRN, // ...right narrow
// Vector saturating shift by immediate:
VQSHLs, // ...left (signed)
VQSHLu, // ...left (unsigned)
VQSHLsu, // ...left (signed to unsigned)
VQSHRNs, // ...right narrow (signed)
VQSHRNu, // ...right narrow (unsigned)
VQSHRNsu, // ...right narrow (signed to unsigned)
// Vector saturating rounding shift by immediate:
VQRSHRNs, // ...right narrow (signed)
VQRSHRNu, // ...right narrow (unsigned)
VQRSHRNsu, // ...right narrow (signed to unsigned)
// Vector shift and insert:
VSLI, // ...left
VSRI, // ...right
// Vector get lane (VMOV scalar to ARM core register)
// (These are used for 8- and 16-bit element types only.)
VGETLANEu, // zero-extend vector extract element
VGETLANEs, // sign-extend vector extract element
// Vector duplicate:
VDUP,
VDUPLANE,
// Vector shuffles:
VEXT, // extract
VREV64, // reverse elements within 64-bit doublewords
VREV32, // reverse elements within 32-bit words
VREV16, // reverse elements within 16-bit halfwords
VZIP, // zip (interleave)
VUZP, // unzip (deinterleave)
VTRN // transpose
};
}
/// Define some predicates that are used for node matching.
namespace ARM {
/// getVMOVImm - If this is a build_vector of constants which can be
/// formed by using a VMOV instruction of the specified element size,
/// return the constant being splatted. The ByteSize field indicates the
/// number of bytes of each element [1248].
SDValue getVMOVImm(SDNode *N, unsigned ByteSize, SelectionDAG &DAG);
/// getVFPf32Imm / getVFPf64Imm - If the given fp immediate can be
/// materialized with a VMOV.f32 / VMOV.f64 (i.e. fconsts / fconstd)
/// instruction, returns its 8-bit integer representation. Otherwise,
/// returns -1.
int getVFPf32Imm(const APFloat &FPImm);
int getVFPf64Imm(const APFloat &FPImm);
}
//===--------------------------------------------------------------------===//
// ARMTargetLowering - ARM Implementation of the TargetLowering interface
class ARMTargetLowering : public TargetLowering {
int VarArgsFrameIndex; // FrameIndex for start of varargs area.
public:
explicit ARMTargetLowering(TargetMachine &TM);
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
/// ReplaceNodeResults - Replace the results of node with an illegal result
/// type with new values built out of custom code.
///
virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG);
virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
virtual const char *getTargetNodeName(unsigned Opcode) const;
virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *MBB,
DenseMap<MachineBasicBlock*, MachineBasicBlock*>*) const;
/// allowsUnalignedMemoryAccesses - Returns true if the target allows
/// unaligned memory accesses. of the specified type.
/// FIXME: Add getOptimalMemOpType to implement memcpy with NEON?
virtual bool allowsUnalignedMemoryAccesses(EVT VT) const;
/// isLegalAddressingMode - Return true if the addressing mode represented
/// by AM is legal for this target, for a load/store of the specified type.
virtual bool isLegalAddressingMode(const AddrMode &AM, const Type *Ty)const;
bool isLegalT2ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
/// isLegalICmpImmediate - 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 Imm) const;
/// getPreIndexedAddressParts - 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;
/// getPostIndexedAddressParts - 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;
virtual void computeMaskedBitsForTargetNode(const SDValue Op,
const APInt &Mask,
APInt &KnownZero,
APInt &KnownOne,
const SelectionDAG &DAG,
unsigned Depth) const;
ConstraintType getConstraintType(const std::string &Constraint) const;
std::pair<unsigned, const TargetRegisterClass*>
getRegForInlineAsmConstraint(const std::string &Constraint,
EVT VT) const;
std::vector<unsigned>
getRegClassForInlineAsmConstraint(const std::string &Constraint,
EVT VT) const;
/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
/// vector. If it is invalid, don't add anything to Ops. If hasMemory is
/// true it means one of the asm constraint of the inline asm instruction
/// being processed is 'm'.
virtual void LowerAsmOperandForConstraint(SDValue Op,
char ConstraintLetter,
bool hasMemory,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) const;
virtual const ARMSubtarget* getSubtarget() {
return Subtarget;
}
/// getFunctionAlignment - Return the Log2 alignment of this function.
virtual unsigned getFunctionAlignment(const Function *F) const;
bool isShuffleMaskLegal(const SmallVectorImpl<int> &M, EVT VT) const;
bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
/// isFPImmLegal - 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;
private:
/// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
/// make the right decision when generating code for different targets.
const ARMSubtarget *Subtarget;
/// ARMPCLabelIndex - Keep track of the number of ARM PC labels created.
///
unsigned ARMPCLabelIndex;
void addTypeForNEON(EVT VT, EVT PromotedLdStVT, EVT PromotedBitwiseVT);
void addDRTypeForNEON(EVT VT);
void addQRTypeForNEON(EVT VT);
typedef SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPassVector;
void PassF64ArgInRegs(DebugLoc dl, SelectionDAG &DAG,
SDValue Chain, SDValue &Arg,
RegsToPassVector &RegsToPass,
CCValAssign &VA, CCValAssign &NextVA,
SDValue &StackPtr,
SmallVector<SDValue, 8> &MemOpChains,
ISD::ArgFlagsTy Flags);
SDValue GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
SDValue &Root, SelectionDAG &DAG, DebugLoc dl);
CCAssignFn *CCAssignFnForNode(CallingConv::ID CC, bool Return, bool isVarArg) const;
SDValue LowerMemOpCallTo(SDValue Chain, SDValue StackPtr, SDValue Arg,
DebugLoc dl, SelectionDAG &DAG,
const CCValAssign &VA,
ISD::ArgFlagsTy Flags);
SDValue LowerINTRINSIC_W_CHAIN(SDValue Op, SelectionDAG &DAG);
SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG);
SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG);
SDValue LowerGlobalAddressDarwin(SDValue Op, SelectionDAG &DAG);
SDValue LowerGlobalAddressELF(SDValue Op, SelectionDAG &DAG);
SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG);
SDValue LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
SelectionDAG &DAG);
SDValue LowerToTLSExecModels(GlobalAddressSDNode *GA,
SelectionDAG &DAG);
SDValue LowerGLOBAL_OFFSET_TABLE(SDValue Op, SelectionDAG &DAG);
SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG);
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG);
SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG);
SDValue LowerShiftRightParts(SDValue Op, SelectionDAG &DAG);
SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG);
SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl,
SDValue Chain,
SDValue Dst, SDValue Src,
SDValue Size, unsigned Align,
bool AlwaysInline,
const Value *DstSV, uint64_t DstSVOff,
const Value *SrcSV, uint64_t SrcSVOff);
SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals);
virtual SDValue
LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals);
virtual SDValue
LowerCall(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool &isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals);
virtual SDValue
LowerReturn(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
DebugLoc dl, SelectionDAG &DAG);
SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
SDValue &ARMCC, SelectionDAG &DAG, DebugLoc dl);
MachineBasicBlock *EmitAtomicCmpSwap(MachineInstr *MI,
MachineBasicBlock *BB,
unsigned Size) const;
MachineBasicBlock *EmitAtomicBinary(MachineInstr *MI,
MachineBasicBlock *BB,
unsigned Size,
unsigned BinOpcode) const;
};
}
#endif // ARMISELLOWERING_H