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Instead of awkwardly encoding calling-convention information with ISD::CALL, ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering provides three virtual functions for targets to override: LowerFormalArguments, LowerCall, and LowerRet, which replace the custom lowering done on the special nodes. They provide the same information, but in a more immediately usable format. This also reworks much of the target-independent tail call logic. The decision of whether or not to perform a tail call is now cleanly split between target-independent portions, and the target dependent portion in IsEligibleForTailCallOptimization. This also synchronizes all in-tree targets, to help enable future refactoring and feature work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
136 lines
4.8 KiB
C++
136 lines
4.8 KiB
C++
//===-- AlphaISelLowering.h - Alpha DAG Lowering Interface ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the interfaces that Alpha uses to lower LLVM code into a
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// selection DAG.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
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#define LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
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#include "llvm/ADT/VectorExtras.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "Alpha.h"
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namespace llvm {
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namespace AlphaISD {
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enum NodeType {
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// Start the numbering where the builting ops and target ops leave off.
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FIRST_NUMBER = ISD::BUILTIN_OP_END,
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//These corrospond to the identical Instruction
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CVTQT_, CVTQS_, CVTTQ_,
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/// GPRelHi/GPRelLo - These represent the high and low 16-bit
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/// parts of a global address respectively.
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GPRelHi, GPRelLo,
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/// RetLit - Literal Relocation of a Global
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RelLit,
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/// GlobalRetAddr - used to restore the return address
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GlobalRetAddr,
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/// CALL - Normal call.
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CALL,
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/// DIVCALL - used for special library calls for div and rem
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DivCall,
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/// return flag operand
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RET_FLAG,
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/// CHAIN = COND_BRANCH CHAIN, OPC, (G|F)PRC, DESTBB [, INFLAG] - This
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/// corresponds to the COND_BRANCH pseudo instruction.
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/// *PRC is the input register to compare to zero,
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/// OPC is the branch opcode to use (e.g. Alpha::BEQ),
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/// DESTBB is the destination block to branch to, and INFLAG is
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/// an optional input flag argument.
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COND_BRANCH_I, COND_BRANCH_F
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};
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}
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class AlphaTargetLowering : public TargetLowering {
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int VarArgsOffset; // What is the offset to the first vaarg
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int VarArgsBase; // What is the base FrameIndex
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bool useITOF;
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public:
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explicit AlphaTargetLowering(TargetMachine &TM);
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/// getSetCCResultType - Get the SETCC result ValueType
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virtual MVT getSetCCResultType(MVT VT) const;
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/// LowerOperation - Provide custom lowering hooks for some operations.
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///
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virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
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/// ReplaceNodeResults - Replace the results of node with an illegal result
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/// type with new values built out of custom code.
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///
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virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
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SelectionDAG &DAG);
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// Friendly names for dumps
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const char *getTargetNodeName(unsigned Opcode) const;
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SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
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unsigned CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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ConstraintType getConstraintType(const std::string &Constraint) const;
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std::vector<unsigned>
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getRegClassForInlineAsmConstraint(const std::string &Constraint,
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MVT VT) const;
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bool hasITOF() { return useITOF; }
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MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
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MachineBasicBlock *BB) const;
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virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
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/// getFunctionAlignment - Return the Log2 alignment of this function.
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virtual unsigned getFunctionAlignment(const Function *F) const;
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private:
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// Helpers for custom lowering.
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void LowerVAARG(SDNode *N, SDValue &Chain, SDValue &DataPtr,
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SelectionDAG &DAG);
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virtual SDValue
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LowerFormalArguments(SDValue Chain,
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unsigned CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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virtual SDValue
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LowerCall(SDValue Chain, SDValue Callee,
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unsigned CallConv, bool isVarArg, bool isTailCall,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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virtual SDValue
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LowerReturn(SDValue Chain,
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unsigned CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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DebugLoc dl, SelectionDAG &DAG);
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};
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}
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#endif // LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
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