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//==-- SystemZISelLowering.h - SystemZ 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 SystemZ uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_SystemZ_ISELLOWERING_H
#define LLVM_TARGET_SystemZ_ISELLOWERING_H
#include "SystemZ.h"
#include "SystemZRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetLowering.h"
namespace llvm {
namespace SystemZISD {
enum {
FIRST_NUMBER = ISD::BUILTIN_OP_END,
/// Return with a flag operand. Operand 0 is the chain operand.
RET_FLAG,
/// CALL/TAILCALL - These operations represent an abstract call
/// instruction, which includes a bunch of information.
CALL,
/// PCRelativeWrapper - PC relative address
PCRelativeWrapper,
/// CMP, UCMP - Compare instruction
CMP,
UCMP,
/// BRCOND - Conditional branch. Operand 0 is chain operand, operand 1 is
/// the block to branch if condition is true, operand 2 is condition code
/// and operand 3 is the flag operand produced by a CMP instruction.
BRCOND,
/// SELECT - Operands 0 and 1 are selection variables, operand 2 is
/// condition code and operand 3 is the flag operand.
SELECT
};
}
class SystemZSubtarget;
class SystemZTargetMachine;
class SystemZTargetLowering : public TargetLowering {
public:
explicit SystemZTargetLowering(SystemZTargetMachine &TM);
/// LowerOperation - Provide custom lowering hooks for some operations.
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
/// getTargetNodeName - This method returns the name of a target specific
/// DAG node.
virtual const char *getTargetNodeName(unsigned Opcode) const;
/// getFunctionAlignment - Return the Log2 alignment of this function.
virtual unsigned getFunctionAlignment(const Function *F) const {
return 1;
}
SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
SDValue LowerCALL(SDValue Op, SelectionDAG &DAG);
SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG);
SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG);
SDValue LowerCCCArguments(SDValue Op, SelectionDAG &DAG);
SDValue LowerCCCCallTo(SDValue Op, SelectionDAG &DAG, unsigned CC);
SDNode* LowerCallResult(SDValue Chain, SDValue InFlag,
CallSDNode *TheCall,
unsigned CallingConv, SelectionDAG &DAG);
SDValue EmitCmp(SDValue LHS, SDValue RHS,
ISD::CondCode CC, SDValue &SystemZCC,
SelectionDAG &DAG);
MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) const;
private:
const SystemZSubtarget &Subtarget;
const SystemZTargetMachine &TM;
const SystemZRegisterInfo *RegInfo;
};
} // namespace llvm
#endif // LLVM_TARGET_SystemZ_ISELLOWERING_H
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