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//===-- MBlazeISelLowering.h - MBlaze 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 MBlaze uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef MBlazeISELLOWERING_H
#define MBlazeISELLOWERING_H
#include "llvm/Support/ErrorHandling.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetLowering.h"
#include "MBlaze.h"
#include "MBlazeSubtarget.h"
namespace llvm {
namespace MBlazeCC {
enum CC {
FIRST = 0,
EQ,
NE,
GT,
LT,
GE,
LE
};
inline static CC getOppositeCondition(CC cc) {
switch (cc) {
default: llvm_unreachable("Unknown condition code");
case EQ: return NE;
case NE: return EQ;
case GT: return LE;
case LT: return GE;
case GE: return LT;
case LE: return GE;
}
}
inline static const char *MBlazeCCToString(CC cc) {
switch (cc) {
default: llvm_unreachable("Unknown condition code");
case EQ: return "eq";
case NE: return "ne";
case GT: return "gt";
case LT: return "lt";
case GE: return "ge";
case LE: return "le";
}
}
}
namespace MBlazeISD {
enum NodeType {
// Start the numbering from where ISD NodeType finishes.
FIRST_NUMBER = ISD::BUILTIN_OP_END,
// Jump and link (call)
JmpLink,
// Handle gp_rel (small data/bss sections) relocation.
GPRel,
// Select CC Pseudo Instruction
Select_CC,
// Wrap up multiple types of instructions
Wrap,
// Integer Compare
ICmp,
// Return from subroutine
Ret,
// Return from interrupt
IRet
};
}
//===--------------------------------------------------------------------===//
// TargetLowering Implementation
//===--------------------------------------------------------------------===//
class MBlazeTargetLowering : public TargetLowering {
public:
explicit MBlazeTargetLowering(MBlazeTargetMachine &TM);
/// LowerOperation - Provide custom lowering hooks for some operations.
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
/// getTargetNodeName - This method returns the name of a target specific
// DAG node.
virtual const char *getTargetNodeName(unsigned Opcode) const;
/// getSetCCResultType - get the ISD::SETCC result ValueType
EVT getSetCCResultType(EVT VT) const;
private:
// Subtarget Info
const MBlazeSubtarget *Subtarget;
// Lower Operand helpers
SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
// Lower Operand specifics
SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
virtual SDValue
LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
virtual SDValue
LowerCall(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool &isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
virtual SDValue
LowerReturn(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
DebugLoc dl, SelectionDAG &DAG) const;
virtual MachineBasicBlock*
EmitCustomShift(MachineInstr *MI, MachineBasicBlock *MBB) const;
virtual MachineBasicBlock*
EmitCustomSelect(MachineInstr *MI, MachineBasicBlock *MBB) const;
virtual MachineBasicBlock*
EmitCustomAtomic(MachineInstr *MI, MachineBasicBlock *MBB) const;
virtual MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *MBB) const;
// Inline asm support
ConstraintType getConstraintType(const std::string &Constraint) 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.
ConstraintWeight getSingleConstraintMatchWeight(
AsmOperandInfo &info, const char *constraint) const;
std::pair<unsigned, const TargetRegisterClass*>
getRegForInlineAsmConstraint(const std::string &Constraint,
EVT VT) const;
virtual 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;
};
}
#endif // MBlazeISELLOWERING_H
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