llvm-6502/lib/Target/Mips/MipsISelLowering.h
Bruno Cardoso Lopes 225ca9cdd7 Several changes to Mips backend, experimental fp support being the most
important.
- Cleanup in the Subtarget info with addition of new features, not all support
  yet, but they allow the future inclusion of features easier. Among new features,
  we have : Arch family info (mips1, mips2, ...), ABI info (o32, eabi), 64-bit
  integer
  and float registers, allegrex vector FPU (VFPU), single float only support.
- TargetMachine now detects allegrex core.
- Added allegrex (Mips32r2) sext_inreg instructions.
- *Added Float Point Instructions*, handling single float only, and
  aliased accesses for 32-bit FPUs.
- Some cleanup in FP instruction formats and FP register classes.
- Calling conventions improved to support mips 32-bit EABI.
- Added Asm Printer support for fp cond codes.
- Added support for sret copy to a return register.
- EABI support added into LowerCALL and FORMAL_ARGS.
- MipsFunctionInfo now keeps a virtual register per function to track the
  sret on function entry until function ret.
- MipsInstrInfo FP support into methods (isMoveInstr, isLoadFromStackSlot, ...),
  FP cond codes mapping and initial FP Branch Analysis.
- Two new Mips SDNode to handle fp branch and compare instructions : FPBrcond,
  FPCmp
- MipsTargetLowering : handling different FP classes, Allegrex support, sret
  return copy, no homing location within EABI, non 32-bit stack objects
  arguments, and asm constraint for float.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53146 91177308-0d34-0410-b5e6-96231b3b80d8
2008-07-05 19:05:21 +00:00

114 lines
3.6 KiB
C++

//===-- MipsISelLowering.h - Mips 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 Mips uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef MipsISELLOWERING_H
#define MipsISELLOWERING_H
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetLowering.h"
#include "Mips.h"
#include "MipsSubtarget.h"
namespace llvm {
namespace MipsISD {
enum NodeType {
// Start the numbering from where ISD NodeType finishes.
FIRST_NUMBER = ISD::BUILTIN_OP_END+Mips::INSTRUCTION_LIST_END,
// Jump and link (call)
JmpLink,
// Get the Higher 16 bits from a 32-bit immediate
// No relation with Mips Hi register
Hi,
// Get the Lower 16 bits from a 32-bit immediate
// No relation with Mips Lo register
Lo,
// Select CC Pseudo Instruction
SelectCC,
// Float Point Branch Conditional
FPBrcond,
// Float Point Compare
FPCmp,
// Return
Ret
};
}
//===--------------------------------------------------------------------===//
// TargetLowering Implementation
//===--------------------------------------------------------------------===//
class MipsTargetLowering : public TargetLowering
{
// FrameIndex for return slot.
int ReturnAddrIndex;
// const MipsSubtarget &MipsSubTarget;
public:
explicit MipsTargetLowering(MipsTargetMachine &TM);
/// LowerOperation - Provide custom lowering hooks for some operations.
virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
/// getTargetNodeName - This method returns the name of a target specific
// DAG node.
virtual const char *getTargetNodeName(unsigned Opcode) const;
/// getSetCCResultType - get the ISD::SETCC result ValueType
MVT getSetCCResultType(const SDOperand &) const;
private:
// Subtarget Info
const MipsSubtarget *Subtarget;
// Lower Operand helpers
SDOperand LowerCCCArguments(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerCCCCallTo(SDOperand Op, SelectionDAG &DAG, unsigned CC);
SDNode *LowerCallResult(SDOperand Chain, SDOperand InFlag, SDNode*TheCall,
unsigned CallingConv, SelectionDAG &DAG);
SDOperand getReturnAddressFrameIndex(SelectionDAG &DAG);
// Lower Operand specifics
SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerGlobalAddress(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerGlobalTLSAddress(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerJumpTable(SDOperand Op, SelectionDAG &DAG);
SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG);
virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *MBB);
// Inline asm support
ConstraintType getConstraintType(const std::string &Constraint) const;
std::pair<unsigned, const TargetRegisterClass*>
getRegForInlineAsmConstraint(const std::string &Constraint,
MVT VT) const;
std::vector<unsigned>
getRegClassForInlineAsmConstraint(const std::string &Constraint,
MVT VT) const;
};
}
#endif // MipsISELLOWERING_H