mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 20:29:48 +00:00
5f43f92c69
to not alias each other, it can be translated as an llvm.memcpy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41489 91177308-0d34-0410-b5e6-96231b3b80d8
200 lines
7.4 KiB
C++
200 lines
7.4 KiB
C++
//===-- llvm/CodeGen/SelectionDAGISel.h - Common Base Class------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the SelectionDAGISel class, which is used as the common
|
|
// base class for SelectionDAG-based instruction selectors.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_SELECTIONDAG_ISEL_H
|
|
#define LLVM_CODEGEN_SELECTIONDAG_ISEL_H
|
|
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Constant.h"
|
|
#include "llvm/CodeGen/SelectionDAG.h"
|
|
#include "llvm/CodeGen/SelectionDAGNodes.h"
|
|
|
|
namespace llvm {
|
|
class SelectionDAGLowering;
|
|
class SDOperand;
|
|
class SSARegMap;
|
|
class MachineBasicBlock;
|
|
class MachineFunction;
|
|
class MachineInstr;
|
|
class TargetLowering;
|
|
class FunctionLoweringInfo;
|
|
class HazardRecognizer;
|
|
|
|
/// SelectionDAGISel - This is the common base class used for SelectionDAG-based
|
|
/// pattern-matching instruction selectors.
|
|
class SelectionDAGISel : public FunctionPass {
|
|
public:
|
|
TargetLowering &TLI;
|
|
SSARegMap *RegMap;
|
|
SelectionDAG *CurDAG;
|
|
MachineBasicBlock *BB;
|
|
AliasAnalysis *AA;
|
|
std::vector<SDNode*> TopOrder;
|
|
unsigned DAGSize;
|
|
static char ID;
|
|
|
|
explicit SelectionDAGISel(TargetLowering &tli) :
|
|
FunctionPass((intptr_t)&ID), TLI(tli), DAGSize(0) {}
|
|
|
|
TargetLowering &getTargetLowering() { return TLI; }
|
|
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
|
|
|
|
virtual bool runOnFunction(Function &Fn);
|
|
|
|
unsigned MakeReg(MVT::ValueType VT);
|
|
|
|
virtual void EmitFunctionEntryCode(Function &Fn, MachineFunction &MF) {}
|
|
virtual void InstructionSelectBasicBlock(SelectionDAG &SD) = 0;
|
|
virtual void SelectRootInit() {
|
|
DAGSize = CurDAG->AssignTopologicalOrder(TopOrder);
|
|
}
|
|
|
|
/// SelectInlineAsmMemoryOperand - Select the specified address as a target
|
|
/// addressing mode, according to the specified constraint code. If this does
|
|
/// not match or is not implemented, return true. The resultant operands
|
|
/// (which will appear in the machine instruction) should be added to the
|
|
/// OutOps vector.
|
|
virtual bool SelectInlineAsmMemoryOperand(const SDOperand &Op,
|
|
char ConstraintCode,
|
|
std::vector<SDOperand> &OutOps,
|
|
SelectionDAG &DAG) {
|
|
return true;
|
|
}
|
|
|
|
/// CanBeFoldedBy - Returns true if the specific operand node N of U can be
|
|
/// folded during instruction selection that starts at Root?
|
|
virtual bool CanBeFoldedBy(SDNode *N, SDNode *U, SDNode *Root) const {
|
|
return true;
|
|
}
|
|
|
|
/// CreateTargetHazardRecognizer - Return a newly allocated hazard recognizer
|
|
/// to use for this target when scheduling the DAG.
|
|
virtual HazardRecognizer *CreateTargetHazardRecognizer();
|
|
|
|
/// CaseBlock - This structure is used to communicate between SDLowering and
|
|
/// SDISel for the code generation of additional basic blocks needed by multi-
|
|
/// case switch statements.
|
|
struct CaseBlock {
|
|
CaseBlock(ISD::CondCode cc, Value *cmplhs, Value *cmprhs, Value *cmpmiddle,
|
|
MachineBasicBlock *truebb, MachineBasicBlock *falsebb,
|
|
MachineBasicBlock *me)
|
|
: CC(cc), CmpLHS(cmplhs), CmpMHS(cmpmiddle), CmpRHS(cmprhs),
|
|
TrueBB(truebb), FalseBB(falsebb), ThisBB(me) {}
|
|
// CC - the condition code to use for the case block's setcc node
|
|
ISD::CondCode CC;
|
|
// CmpLHS/CmpRHS/CmpMHS - The LHS/MHS/RHS of the comparison to emit.
|
|
// Emit by default LHS op RHS. MHS is used for range comparisons:
|
|
// If MHS is not null: (LHS <= MHS) and (MHS <= RHS).
|
|
Value *CmpLHS, *CmpMHS, *CmpRHS;
|
|
// TrueBB/FalseBB - the block to branch to if the setcc is true/false.
|
|
MachineBasicBlock *TrueBB, *FalseBB;
|
|
// ThisBB - the block into which to emit the code for the setcc and branches
|
|
MachineBasicBlock *ThisBB;
|
|
};
|
|
struct JumpTable {
|
|
JumpTable(unsigned R, unsigned J, MachineBasicBlock *M,
|
|
MachineBasicBlock *D): Reg(R), JTI(J), MBB(M), Default(D) {}
|
|
|
|
/// Reg - the virtual register containing the index of the jump table entry
|
|
//. to jump to.
|
|
unsigned Reg;
|
|
/// JTI - the JumpTableIndex for this jump table in the function.
|
|
unsigned JTI;
|
|
/// MBB - the MBB into which to emit the code for the indirect jump.
|
|
MachineBasicBlock *MBB;
|
|
/// Default - the MBB of the default bb, which is a successor of the range
|
|
/// check MBB. This is when updating PHI nodes in successors.
|
|
MachineBasicBlock *Default;
|
|
};
|
|
struct JumpTableHeader {
|
|
JumpTableHeader(uint64_t F, uint64_t L, Value* SV, MachineBasicBlock* H,
|
|
bool E = false):
|
|
First(F), Last(L), SValue(SV), HeaderBB(H), Emitted(E) {}
|
|
uint64_t First;
|
|
uint64_t Last;
|
|
Value *SValue;
|
|
MachineBasicBlock *HeaderBB;
|
|
bool Emitted;
|
|
};
|
|
typedef std::pair<JumpTableHeader, JumpTable> JumpTableBlock;
|
|
|
|
struct BitTestCase {
|
|
BitTestCase(uint64_t M, MachineBasicBlock* T, MachineBasicBlock* Tr):
|
|
Mask(M), ThisBB(T), TargetBB(Tr) { }
|
|
uint64_t Mask;
|
|
MachineBasicBlock* ThisBB;
|
|
MachineBasicBlock* TargetBB;
|
|
};
|
|
|
|
typedef SmallVector<BitTestCase, 3> BitTestInfo;
|
|
|
|
struct BitTestBlock {
|
|
BitTestBlock(uint64_t F, uint64_t R, Value* SV,
|
|
unsigned Rg, bool E,
|
|
MachineBasicBlock* P, MachineBasicBlock* D,
|
|
const BitTestInfo& C):
|
|
First(F), Range(R), SValue(SV), Reg(Rg), Emitted(E),
|
|
Parent(P), Default(D), Cases(C) { }
|
|
uint64_t First;
|
|
uint64_t Range;
|
|
Value *SValue;
|
|
unsigned Reg;
|
|
bool Emitted;
|
|
MachineBasicBlock *Parent;
|
|
MachineBasicBlock *Default;
|
|
BitTestInfo Cases;
|
|
};
|
|
protected:
|
|
/// Pick a safe ordering and emit instructions for each target node in the
|
|
/// graph.
|
|
void ScheduleAndEmitDAG(SelectionDAG &DAG);
|
|
|
|
/// SelectInlineAsmMemoryOperands - Calls to this are automatically generated
|
|
/// by tblgen. Others should not call it.
|
|
void SelectInlineAsmMemoryOperands(std::vector<SDOperand> &Ops,
|
|
SelectionDAG &DAG);
|
|
|
|
// Calls to these predicates are generated by tblgen.
|
|
bool CheckAndMask(SDOperand LHS, ConstantSDNode *RHS,
|
|
int64_t DesiredMaskS) const;
|
|
bool CheckOrMask(SDOperand LHS, ConstantSDNode *RHS,
|
|
int64_t DesiredMaskS) const;
|
|
|
|
private:
|
|
void SelectBasicBlock(BasicBlock *BB, MachineFunction &MF,
|
|
FunctionLoweringInfo &FuncInfo);
|
|
|
|
void BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB,
|
|
std::vector<std::pair<MachineInstr*, unsigned> > &PHINodesToUpdate,
|
|
FunctionLoweringInfo &FuncInfo);
|
|
void CodeGenAndEmitDAG(SelectionDAG &DAG);
|
|
void LowerArguments(BasicBlock *BB, SelectionDAGLowering &SDL,
|
|
std::vector<SDOperand> &UnorderedChains);
|
|
|
|
/// SwitchCases - Vector of CaseBlock structures used to communicate
|
|
/// SwitchInst code generation information.
|
|
std::vector<CaseBlock> SwitchCases;
|
|
|
|
/// JTCases - Vector of JumpTable structures which holds necessary information
|
|
/// for emitting a jump tables during SwitchInst code generation.
|
|
std::vector<JumpTableBlock> JTCases;
|
|
|
|
std::vector<BitTestBlock> BitTestCases;
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* LLVM_CODEGEN_SELECTIONDAG_ISEL_H */
|