#include "llvm/ADT/SmallSet.h"
#endif
#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
namespace llvm {
class AllocaInst;
class ConstantFP;
+class FunctionLoweringInfo;
class Instruction;
class MachineBasicBlock;
class MachineConstantPool;
class TargetLowering;
class TargetMachine;
class TargetRegisterClass;
+class TargetRegisterInfo;
+class LoadInst;
/// 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;
+ FunctionLoweringInfo &FuncInfo;
MachineRegisterInfo &MRI;
MachineFrameInfo &MFI;
MachineConstantPool &MCP;
const TargetData &TD;
const TargetInstrInfo &TII;
const TargetLowering &TLI;
- bool IsBottomUp;
+ const TargetRegisterInfo &TRI;
+ MachineInstr *LastLocalValue;
public:
+ /// getLastLocalValue - Return the position of the last instruction
+ /// emitted for materializing constants for use in the current block.
+ MachineInstr *getLastLocalValue() { return LastLocalValue; }
+
+ /// setLastLocalValue - Update the position of the last instruction
+ /// emitted for materializing constants for use in the current block.
+ void setLastLocalValue(MachineInstr *I) { LastLocalValue = I; }
+
/// 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;
- }
+ void startNewBlock();
/// getCurDebugLoc() - Return current debug location information.
DebugLoc getCurDebugLoc() const { return DL; }
/// index value.
std::pair<unsigned, bool> getRegForGEPIndex(const Value *V);
+ /// TryToFoldLoad - The specified machine instr operand is a vreg, and that
+ /// vreg is being provided by the specified load instruction. If possible,
+ /// try to fold the load as an operand to the instruction, returning true if
+ /// possible.
+ virtual bool TryToFoldLoad(MachineInstr * /*MI*/, unsigned /*OpNo*/,
+ const LoadInst * /*LI*/) {
+ return false;
+ }
+
+ /// recomputeInsertPt - Reset InsertPt to prepare for inserting instructions
+ /// into the current block.
+ void recomputeInsertPt();
+
+ struct SavePoint {
+ MachineBasicBlock::iterator InsertPt;
+ DebugLoc DL;
+ };
+
+ /// enterLocalValueArea - Prepare InsertPt to begin inserting instructions
+ /// into the local value area and return the old insert position.
+ SavePoint enterLocalValueArea();
+
+ /// leaveLocalValueArea - Reset InsertPt to the given old insert position.
+ void leaveLocalValueArea(SavePoint Old);
+
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
- );
+ explicit FastISel(FunctionLoweringInfo &funcInfo);
/// TargetSelectInstruction - This method is called by target-independent
/// code when the normal FastISel process fails to select an instruction.
/// 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);
+ void FastEmitBranch(MachineBasicBlock *MBB, DebugLoc DL);
unsigned UpdateValueMap(const Value* I, unsigned Reg);