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//===-- FastISel.h - Definition of the FastISel class ---------------------===//
//
// 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 FastISel class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_FASTISEL_H
#define LLVM_CODEGEN_FASTISEL_H
#include "llvm/ADT/DenseMap.h"
#ifndef NDEBUG
#include "llvm/ADT/SmallSet.h"
#endif
#include "llvm/CodeGen/ValueTypes.h"
namespace llvm {
class AllocaInst;
class ConstantFP;
class Instruction;
class MachineBasicBlock;
class MachineConstantPool;
class MachineFunction;
class MachineInstr;
class MachineFrameInfo;
class MachineRegisterInfo;
class TargetData;
class TargetInstrInfo;
class TargetLowering;
class TargetMachine;
class TargetRegisterClass;
/// FastISel - This is a fast-path instruction selection class that
/// generates poor code and doesn't support illegal types or non-trivial
/// lowering, but runs quickly.
class FastISel {
protected:
MachineBasicBlock *MBB;
DenseMap<const Value *, unsigned> LocalValueMap;
DenseMap<const Value *, unsigned> &ValueMap;
DenseMap<const BasicBlock *, MachineBasicBlock *> &MBBMap;
DenseMap<const AllocaInst *, int> &StaticAllocaMap;
std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate;
#ifndef NDEBUG
SmallSet<const Instruction *, 8> &CatchInfoLost;
#endif
MachineFunction &MF;
MachineRegisterInfo &MRI;
MachineFrameInfo &MFI;
MachineConstantPool &MCP;
DebugLoc DL;
const TargetMachine &TM;
const TargetData &TD;
const TargetInstrInfo &TII;
const TargetLowering &TLI;
bool IsBottomUp;
public:
/// startNewBlock - Set the current block to which generated machine
/// instructions will be appended, and clear the local CSE map.
///
void startNewBlock(MachineBasicBlock *mbb) {
setCurrentBlock(mbb);
LocalValueMap.clear();
}
/// setCurrentBlock - Set the current block to which generated machine
/// instructions will be appended.
///
void setCurrentBlock(MachineBasicBlock *mbb) {
MBB = mbb;
}
/// getCurDebugLoc() - Return current debug location information.
DebugLoc getCurDebugLoc() const { return DL; }
/// SelectInstruction - Do "fast" instruction selection for the given
/// LLVM IR instruction, and append generated machine instructions to
/// the current block. Return true if selection was successful.
///
bool SelectInstruction(const Instruction *I);
/// SelectOperator - Do "fast" instruction selection for the given
/// LLVM IR operator (Instruction or ConstantExpr), and append
/// generated machine instructions to the current block. Return true
/// if selection was successful.
///
bool SelectOperator(const User *I, unsigned Opcode);
/// getRegForValue - Create a virtual register and arrange for it to
/// be assigned the value for the given LLVM value.
unsigned getRegForValue(const Value *V);
/// lookUpRegForValue - Look up the value to see if its value is already
/// cached in a register. It may be defined by instructions across blocks or
/// defined locally.
unsigned lookUpRegForValue(const Value *V);
/// getRegForGEPIndex - This is a wrapper around getRegForValue that also
/// takes care of truncating or sign-extending the given getelementptr
/// index value.
std::pair<unsigned, bool> getRegForGEPIndex(const Value *V);
virtual ~FastISel();
protected:
FastISel(MachineFunction &mf,
DenseMap<const Value *, unsigned> &vm,
DenseMap<const BasicBlock *, MachineBasicBlock *> &bm,
DenseMap<const AllocaInst *, int> &am,
std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate
#ifndef NDEBUG
, SmallSet<const Instruction *, 8> &cil
#endif
);
/// TargetSelectInstruction - This method is called by target-independent
/// code when the normal FastISel process fails to select an instruction.
/// This gives targets a chance to emit code for anything that doesn't
/// fit into FastISel's framework. It returns true if it was successful.
///
virtual bool
TargetSelectInstruction(const Instruction *I) = 0;
/// FastEmit_r - This method is called by target-independent code
/// to request that an instruction with the given type and opcode
/// be emitted.
virtual unsigned FastEmit_(MVT VT,
MVT RetVT,
unsigned Opcode);
/// FastEmit_r - This method is called by target-independent code
/// to request that an instruction with the given type, opcode, and
/// register operand be emitted.
///
virtual unsigned FastEmit_r(MVT VT,
MVT RetVT,
unsigned Opcode,
unsigned Op0, bool Op0IsKill);
/// FastEmit_rr - This method is called by target-independent code
/// to request that an instruction with the given type, opcode, and
/// register operands be emitted.
///
virtual unsigned FastEmit_rr(MVT VT,
MVT RetVT,
unsigned Opcode,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill);
/// FastEmit_ri - This method is called by target-independent code
/// to request that an instruction with the given type, opcode, and
/// register and immediate operands be emitted.
///
virtual unsigned FastEmit_ri(MVT VT,
MVT RetVT,
unsigned Opcode,
unsigned Op0, bool Op0IsKill,
uint64_t Imm);
/// FastEmit_rf - This method is called by target-independent code
/// to request that an instruction with the given type, opcode, and
/// register and floating-point immediate operands be emitted.
///
virtual unsigned FastEmit_rf(MVT VT,
MVT RetVT,
unsigned Opcode,
unsigned Op0, bool Op0IsKill,
const ConstantFP *FPImm);
/// FastEmit_rri - This method is called by target-independent code
/// to request that an instruction with the given type, opcode, and
/// register and immediate operands be emitted.
///
virtual unsigned FastEmit_rri(MVT VT,
MVT RetVT,
unsigned Opcode,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill,
uint64_t Imm);
/// FastEmit_ri_ - This method is a wrapper of FastEmit_ri. It first tries
/// to emit an instruction with an immediate operand using FastEmit_ri.
/// If that fails, it materializes the immediate into a register and try
/// FastEmit_rr instead.
unsigned FastEmit_ri_(MVT VT,
unsigned Opcode,
unsigned Op0, bool Op0IsKill,
uint64_t Imm, MVT ImmType);
/// FastEmit_rf_ - This method is a wrapper of FastEmit_rf. It first tries
/// to emit an instruction with an immediate operand using FastEmit_rf.
/// If that fails, it materializes the immediate into a register and try
/// FastEmit_rr instead.
unsigned FastEmit_rf_(MVT VT,
unsigned Opcode,
unsigned Op0, bool Op0IsKill,
const ConstantFP *FPImm, MVT ImmType);
/// FastEmit_i - This method is called by target-independent code
/// to request that an instruction with the given type, opcode, and
/// immediate operand be emitted.
virtual unsigned FastEmit_i(MVT VT,
MVT RetVT,
unsigned Opcode,
uint64_t Imm);
/// FastEmit_f - This method is called by target-independent code
/// to request that an instruction with the given type, opcode, and
/// floating-point immediate operand be emitted.
virtual unsigned FastEmit_f(MVT VT,
MVT RetVT,
unsigned Opcode,
const ConstantFP *FPImm);
/// FastEmitInst_ - Emit a MachineInstr with no operands and a
/// result register in the given register class.
///
unsigned FastEmitInst_(unsigned MachineInstOpcode,
const TargetRegisterClass *RC);
/// FastEmitInst_r - Emit a MachineInstr with one register operand
/// and a result register in the given register class.
///
unsigned FastEmitInst_r(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill);
/// FastEmitInst_rr - Emit a MachineInstr with two register operands
/// and a result register in the given register class.
///
unsigned FastEmitInst_rr(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill);
/// FastEmitInst_ri - Emit a MachineInstr with two register operands
/// and a result register in the given register class.
///
unsigned FastEmitInst_ri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
uint64_t Imm);
/// FastEmitInst_rf - Emit a MachineInstr with two register operands
/// and a result register in the given register class.
///
unsigned FastEmitInst_rf(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
const ConstantFP *FPImm);
/// FastEmitInst_rri - Emit a MachineInstr with two register operands,
/// an immediate, and a result register in the given register class.
///
unsigned FastEmitInst_rri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill,
uint64_t Imm);
/// FastEmitInst_i - Emit a MachineInstr with a single immediate
/// operand, and a result register in the given register class.
unsigned FastEmitInst_i(unsigned MachineInstrOpcode,
const TargetRegisterClass *RC,
uint64_t Imm);
/// FastEmitInst_extractsubreg - Emit a MachineInstr for an extract_subreg
/// from a specified index of a superregister to a specified type.
unsigned FastEmitInst_extractsubreg(MVT RetVT,
unsigned Op0, bool Op0IsKill,
uint32_t Idx);
/// FastEmitZExtFromI1 - Emit MachineInstrs to compute the value of Op
/// with all but the least significant bit set to zero.
unsigned FastEmitZExtFromI1(MVT VT,
unsigned Op0, bool Op0IsKill);
/// FastEmitBranch - Emit an unconditional branch to the given block,
/// unless it is the immediate (fall-through) successor, and update
/// the CFG.
void FastEmitBranch(MachineBasicBlock *MBB);
unsigned UpdateValueMap(const Value* I, unsigned Reg);
unsigned createResultReg(const TargetRegisterClass *RC);
/// TargetMaterializeConstant - Emit a constant in a register using
/// target-specific logic, such as constant pool loads.
virtual unsigned TargetMaterializeConstant(const Constant* C) {
return 0;
}
/// TargetMaterializeAlloca - Emit an alloca address in a register using
/// target-specific logic.
virtual unsigned TargetMaterializeAlloca(const AllocaInst* C) {
return 0;
}
private:
bool SelectBinaryOp(const User *I, unsigned ISDOpcode);
bool SelectFNeg(const User *I);
bool SelectGetElementPtr(const User *I);
bool SelectCall(const User *I);
bool SelectBitCast(const User *I);
bool SelectCast(const User *I, unsigned Opcode);
/// HandlePHINodesInSuccessorBlocks - Handle PHI nodes in successor blocks.
/// Emit code to ensure constants are copied into registers when needed.
/// Remember the virtual registers that need to be added to the Machine PHI
/// nodes as input. We cannot just directly add them, because expansion
/// might result in multiple MBB's for one BB. As such, the start of the
/// BB might correspond to a different MBB than the end.
bool HandlePHINodesInSuccessorBlocks(const BasicBlock *LLVMBB);
/// materializeRegForValue - Helper for getRegForVale. This function is
/// called when the value isn't already available in a register and must
/// be materialized with new instructions.
unsigned materializeRegForValue(const Value *V, MVT VT);
/// hasTrivialKill - Test whether the given value has exactly one use.
bool hasTrivialKill(const Value *V) const;
};
}
#endif
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