mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-05 17:30:02 +00:00
(OP (trunc x), (trunc y)) -> (trunc (OP x, y)) Unfortunately this simple change causes dag combine to infinite looping. The problem is the shrink demanded ops optimization tend to canonicalize expressions in the opposite manner. That is badness. This patch disable those optimizations in dag combine but instead it is done as a late pass in sdisel. This also exposes some deficiencies in dag combine and x86 setcc / brcond lowering. Teach them to look pass ISD::TRUNCATE in various places. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92849 91177308-0d34-0410-b5e6-96231b3b80d8
151 lines
5.0 KiB
C++
151 lines
5.0 KiB
C++
//===-- llvm/CodeGen/SelectionDAGISel.h - Common Base Class------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file 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/BasicBlock.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Constant.h"
|
|
#include "llvm/CodeGen/SelectionDAG.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
|
|
namespace llvm {
|
|
class FastISel;
|
|
class SelectionDAGBuilder;
|
|
class SDValue;
|
|
class MachineRegisterInfo;
|
|
class MachineBasicBlock;
|
|
class MachineFunction;
|
|
class MachineInstr;
|
|
class MachineModuleInfo;
|
|
class DwarfWriter;
|
|
class TargetLowering;
|
|
class TargetInstrInfo;
|
|
class FunctionLoweringInfo;
|
|
class ScheduleHazardRecognizer;
|
|
class GCFunctionInfo;
|
|
class ScheduleDAGSDNodes;
|
|
|
|
/// SelectionDAGISel - This is the common base class used for SelectionDAG-based
|
|
/// pattern-matching instruction selectors.
|
|
class SelectionDAGISel : public MachineFunctionPass {
|
|
public:
|
|
const TargetMachine &TM;
|
|
TargetLowering &TLI;
|
|
FunctionLoweringInfo *FuncInfo;
|
|
MachineFunction *MF;
|
|
MachineRegisterInfo *RegInfo;
|
|
SelectionDAG *CurDAG;
|
|
SelectionDAGBuilder *SDB;
|
|
MachineBasicBlock *BB;
|
|
AliasAnalysis *AA;
|
|
GCFunctionInfo *GFI;
|
|
CodeGenOpt::Level OptLevel;
|
|
static char ID;
|
|
|
|
explicit SelectionDAGISel(TargetMachine &tm,
|
|
CodeGenOpt::Level OL = CodeGenOpt::Default);
|
|
virtual ~SelectionDAGISel();
|
|
|
|
TargetLowering &getTargetLowering() { return TLI; }
|
|
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
|
|
|
|
virtual bool runOnMachineFunction(MachineFunction &MF);
|
|
|
|
unsigned MakeReg(EVT VT);
|
|
|
|
virtual void EmitFunctionEntryCode(Function &Fn, MachineFunction &MF) {}
|
|
virtual void InstructionSelect() = 0;
|
|
|
|
void SelectRootInit() {
|
|
DAGSize = CurDAG->AssignTopologicalOrder();
|
|
}
|
|
|
|
/// 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 SDValue &Op,
|
|
char ConstraintCode,
|
|
std::vector<SDValue> &OutOps) {
|
|
return true;
|
|
}
|
|
|
|
/// IsLegalAndProfitableToFold - Returns true if the specific operand node N of
|
|
/// U can be folded during instruction selection that starts at Root and
|
|
/// folding N is profitable.
|
|
virtual
|
|
bool IsLegalAndProfitableToFold(SDNode *N, SDNode *U, SDNode *Root) const;
|
|
|
|
/// CreateTargetHazardRecognizer - Return a newly allocated hazard recognizer
|
|
/// to use for this target when scheduling the DAG.
|
|
virtual ScheduleHazardRecognizer *CreateTargetHazardRecognizer();
|
|
|
|
protected:
|
|
/// DAGSize - Size of DAG being instruction selected.
|
|
///
|
|
unsigned DAGSize;
|
|
|
|
/// SelectInlineAsmMemoryOperands - Calls to this are automatically generated
|
|
/// by tblgen. Others should not call it.
|
|
void SelectInlineAsmMemoryOperands(std::vector<SDValue> &Ops);
|
|
|
|
// Calls to these predicates are generated by tblgen.
|
|
bool CheckAndMask(SDValue LHS, ConstantSDNode *RHS,
|
|
int64_t DesiredMaskS) const;
|
|
bool CheckOrMask(SDValue LHS, ConstantSDNode *RHS,
|
|
int64_t DesiredMaskS) const;
|
|
|
|
// Calls to these functions are generated by tblgen.
|
|
SDNode *Select_INLINEASM(SDNode *N);
|
|
SDNode *Select_UNDEF(SDNode *N);
|
|
SDNode *Select_EH_LABEL(SDNode *N);
|
|
void CannotYetSelect(SDNode *N);
|
|
void CannotYetSelectIntrinsic(SDNode *N);
|
|
|
|
private:
|
|
void SelectAllBasicBlocks(Function &Fn, MachineFunction &MF,
|
|
MachineModuleInfo *MMI,
|
|
DwarfWriter *DW,
|
|
const TargetInstrInfo &TII);
|
|
void FinishBasicBlock();
|
|
|
|
void SelectBasicBlock(BasicBlock *LLVMBB,
|
|
BasicBlock::iterator Begin,
|
|
BasicBlock::iterator End,
|
|
bool &HadTailCall);
|
|
void CodeGenAndEmitDAG();
|
|
void LowerArguments(BasicBlock *BB);
|
|
|
|
void ShrinkDemandedOps();
|
|
void ComputeLiveOutVRegInfo();
|
|
|
|
void HandlePHINodesInSuccessorBlocks(BasicBlock *LLVMBB);
|
|
|
|
bool HandlePHINodesInSuccessorBlocksFast(BasicBlock *LLVMBB, FastISel *F);
|
|
|
|
/// Create the scheduler. If a specific scheduler was specified
|
|
/// via the SchedulerRegistry, use it, otherwise select the
|
|
/// one preferred by the target.
|
|
///
|
|
ScheduleDAGSDNodes *CreateScheduler();
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* LLVM_CODEGEN_SELECTIONDAG_ISEL_H */
|