namespace llvm {
class AllocaInst;
+class Constant;
class ConstantFP;
class FunctionLoweringInfo;
class Instruction;
+class LoadInst;
class MachineBasicBlock;
class MachineConstantPool;
class MachineFunction;
class MachineRegisterInfo;
class TargetData;
class TargetInstrInfo;
+class TargetLibraryInfo;
class TargetLowering;
class TargetMachine;
class TargetRegisterClass;
class TargetRegisterInfo;
-class LoadInst;
+class User;
+class Value;
/// FastISel - This is a fast-path instruction selection class that
/// generates poor code and doesn't support illegal types or non-trivial
const TargetInstrInfo &TII;
const TargetLowering &TLI;
const TargetRegisterInfo &TRI;
+ const TargetLibraryInfo *LibInfo;
+
+ /// The position of the last instruction for materializing constants
+ /// for use in the current block. It resets to EmitStartPt when it
+ /// makes sense (for example, it's usually profitable to avoid function
+ /// calls between the definition and the use)
MachineInstr *LastLocalValue;
+ /// The top most instruction in the current block that is allowed for
+ /// emitting local variables. LastLocalValue resets to EmitStartPt when
+ /// it makes sense (for example, on function calls)
+ MachineInstr *EmitStartPt;
+
public:
/// getLastLocalValue - Return the position of the last instruction
/// emitted for materializing constants for use in the current block.
/// setLastLocalValue - Update the position of the last instruction
/// emitted for materializing constants for use in the current block.
- void setLastLocalValue(MachineInstr *I) { LastLocalValue = I; }
+ void setLastLocalValue(MachineInstr *I) {
+ EmitStartPt = I;
+ LastLocalValue = I;
+ }
/// startNewBlock - Set the current block to which generated machine
/// instructions will be appended, and clear the local CSE map.
virtual ~FastISel();
protected:
- explicit FastISel(FunctionLoweringInfo &funcInfo);
+ explicit FastISel(FunctionLoweringInfo &funcInfo,
+ const TargetLibraryInfo *libInfo);
/// TargetSelectInstruction - This method is called by target-independent
/// code when the normal FastISel process fails to select an instruction.
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.
unsigned Op0, bool Op0IsKill,
unsigned Op1, bool Op1IsKill);
+ /// FastEmitInst_rrr - Emit a MachineInstr with three register operands
+ /// and a result register in the given register class.
+ ///
+ unsigned FastEmitInst_rrr(unsigned MachineInstOpcode,
+ const TargetRegisterClass *RC,
+ unsigned Op0, bool Op0IsKill,
+ unsigned Op1, bool Op1IsKill,
+ unsigned Op2, bool Op2IsKill);
+
/// FastEmitInst_ri - Emit a MachineInstr with a register operand,
/// an immediate, and a result register in the given register class.
///
unsigned Op1, bool Op1IsKill,
uint64_t Imm);
+ /// FastEmitInst_rrii - Emit a MachineInstr with two register operands,
+ /// two immediates operands, and a result register in the given register
+ /// class.
+ unsigned FastEmitInst_rrii(unsigned MachineInstOpcode,
+ const TargetRegisterClass *RC,
+ unsigned Op0, bool Op0IsKill,
+ unsigned Op1, bool Op1IsKill,
+ uint64_t Imm1, uint64_t Imm2);
+
/// FastEmitInst_i - Emit a MachineInstr with a single immediate
/// operand, and a result register in the given register class.
unsigned FastEmitInst_i(unsigned MachineInstrOpcode,
/// the CFG.
void FastEmitBranch(MachineBasicBlock *MBB, DebugLoc DL);
- unsigned UpdateValueMap(const Value* I, unsigned Reg);
+ void UpdateValueMap(const Value* I, unsigned Reg, unsigned NumRegs = 1);
unsigned createResultReg(const TargetRegisterClass *RC);
return 0;
}
+ virtual unsigned TargetMaterializeFloatZero(const ConstantFP* CF) {
+ return 0;
+ }
+
private:
bool SelectBinaryOp(const User *I, unsigned ISDOpcode);
bool SelectCast(const User *I, unsigned Opcode);
+ bool SelectExtractValue(const User *I);
+
+ bool SelectInsertValue(const User *I);
+
/// 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
/// be materialized with new instructions.
unsigned materializeRegForValue(const Value *V, MVT VT);
+ /// flushLocalValueMap - clears LocalValueMap and moves the area for the
+ /// new local variables to the beginning of the block. It helps to avoid
+ /// spilling cached variables across heavy instructions like calls.
+ void flushLocalValueMap();
+
/// hasTrivialKill - Test whether the given value has exactly one use.
bool hasTrivialKill(const Value *V) const;
+
+ /// removeDeadCode - Remove all dead instructions between the I and E.
+ void removeDeadCode(MachineBasicBlock::iterator I,
+ MachineBasicBlock::iterator E);
};
}
projects / oota-llvm.git / blobdiff