llvm-project/llvm/lib/Target/X86/X86ISelLowering.h

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5.5 KiB
C++

//===-- X86ISelLowering.h - X86 DAG Lowering Interface ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that X86 uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef X86ISELLOWERING_H
#define X86ISELLOWERING_H
#include "llvm/Target/TargetLowering.h"
#include "llvm/CodeGen/SelectionDAG.h"
namespace llvm {
// X86 Specific DAG Nodes
namespace X86ISD {
enum NodeType {
// Start the numbering where the builtin ops leave off.
FIRST_NUMBER = ISD::BUILTIN_OP_END,
/// FILD64m - This instruction implements SINT_TO_FP with a
/// 64-bit source in memory and a FP reg result. This corresponds to
/// the X86::FILD64m instruction. It has two inputs (token chain and
/// address) and two outputs (FP value and token chain).
FILD64m,
/// FP_TO_INT*_IN_MEM - This instruction implements FP_TO_SINT with the
/// integer destination in memory and a FP reg source. This corresponds
/// to the X86::FIST*m instructions and the rounding mode change stuff. It
/// has two inputs (token chain and address) and two outputs (FP value and
/// token chain).
FP_TO_INT16_IN_MEM,
FP_TO_INT32_IN_MEM,
FP_TO_INT64_IN_MEM,
/// CALL/TAILCALL - These operations represent an abstract X86 call
/// instruction, which includes a bunch of information. In particular the
/// operands of these node are:
///
/// #0 - The incoming token chain
/// #1 - The callee
/// #2 - The number of arg bytes the caller pushes on the stack.
/// #3 - The number of arg bytes the callee pops off the stack.
/// #4 - The value to pass in AL/AX/EAX (optional)
/// #5 - The value to pass in DL/DX/EDX (optional)
///
/// The result values of these nodes are:
///
/// #0 - The outgoing token chain
/// #1 - The first register result value (optional)
/// #2 - The second register result value (optional)
///
/// The CALL vs TAILCALL distinction boils down to whether the callee is
/// known not to modify the caller's stack frame, as is standard with
/// LLVM.
CALL,
TAILCALL,
/// RDTSC_DAG - This operation implements the lowering for
/// readcyclecounter
RDTSC_DAG,
};
}
//===----------------------------------------------------------------------===//
// X86TargetLowering - X86 Implementation of the TargetLowering interface
class X86TargetLowering : public TargetLowering {
int VarArgsFrameIndex; // FrameIndex for start of varargs area.
int ReturnAddrIndex; // FrameIndex for return slot.
int BytesToPopOnReturn; // Number of arg bytes ret should pop.
int BytesCallerReserves; // Number of arg bytes caller makes.
public:
X86TargetLowering(TargetMachine &TM);
// Return the number of bytes that a function should pop when it returns (in
// addition to the space used by the return address).
//
unsigned getBytesToPopOnReturn() const { return BytesToPopOnReturn; }
// Return the number of bytes that the caller reserves for arguments passed
// to this function.
unsigned getBytesCallerReserves() const { return BytesCallerReserves; }
/// LowerOperation - Provide custom lowering hooks for some operations.
///
virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
/// LowerArguments - This hook must be implemented to indicate how we should
/// lower the arguments for the specified function, into the specified DAG.
virtual std::vector<SDOperand>
LowerArguments(Function &F, SelectionDAG &DAG);
/// LowerCallTo - This hook lowers an abstract call to a function into an
/// actual call.
virtual std::pair<SDOperand, SDOperand>
LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg, unsigned CC,
bool isTailCall, SDOperand Callee, ArgListTy &Args,
SelectionDAG &DAG);
virtual SDOperand LowerVAStart(SDOperand Chain, SDOperand VAListP,
Value *VAListV, SelectionDAG &DAG);
virtual std::pair<SDOperand,SDOperand>
LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
const Type *ArgTy, SelectionDAG &DAG);
virtual std::pair<SDOperand, SDOperand>
LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
SelectionDAG &DAG);
SDOperand getReturnAddressFrameIndex(SelectionDAG &DAG);
private:
// C Calling Convention implementation.
std::vector<SDOperand> LowerCCCArguments(Function &F, SelectionDAG &DAG);
std::pair<SDOperand, SDOperand>
LowerCCCCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg,
bool isTailCall,
SDOperand Callee, ArgListTy &Args, SelectionDAG &DAG);
// Fast Calling Convention implementation.
std::vector<SDOperand> LowerFastCCArguments(Function &F, SelectionDAG &DAG);
std::pair<SDOperand, SDOperand>
LowerFastCCCallTo(SDOperand Chain, const Type *RetTy, bool isTailCall,
SDOperand Callee, ArgListTy &Args, SelectionDAG &DAG);
};
}
#endif // X86ISELLOWERING_H