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//===-- SPUISelLowering.h - Cell SPU 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 Cell SPU uses to lower LLVM code into
// a selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef SPU_ISELLOWERING_H
#define SPU_ISELLOWERING_H
#include "llvm/Target/TargetLowering.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "SPU.h"
namespace llvm {
namespace SPUISD {
enum NodeType {
// Start the numbering where the builting ops and target ops leave off.
FIRST_NUMBER = ISD::BUILTIN_OP_END,
// Pseudo instructions:
RET_FLAG, ///< Return with flag, matched by bi instruction
Hi, ///< High address component (upper 16)
Lo, ///< Low address component (lower 16)
PCRelAddr, ///< Program counter relative address
AFormAddr, ///< A-form address (local store)
IndirectAddr, ///< D-Form "imm($r)" and X-form "$r($r)"
LDRESULT, ///< Load result (value, chain)
CALL, ///< CALL instruction
SHUFB, ///< Vector shuffle (permute)
SHUFFLE_MASK, ///< Shuffle mask
CNTB, ///< Count leading ones in bytes
PREFSLOT2VEC, ///< Promote scalar->vector
VEC2PREFSLOT, ///< Extract element 0
SHL_BITS, ///< Shift quad left, by bits
SHL_BYTES, ///< Shift quad left, by bytes
SRL_BYTES, ///< Shift quad right, by bytes. Insert zeros.
VEC_ROTL, ///< Vector rotate left
VEC_ROTR, ///< Vector rotate right
ROTBYTES_LEFT, ///< Rotate bytes (loads -> ROTQBYI)
ROTBYTES_LEFT_BITS, ///< Rotate bytes left by bit shift count
SELECT_MASK, ///< Select Mask (FSM, FSMB, FSMH, FSMBI)
SELB, ///< Select bits -> (b & mask) | (a & ~mask)
// Markers: These aren't used to generate target-dependent nodes, but
// are used during instruction selection.
ADD64_MARKER, ///< i64 addition marker
SUB64_MARKER, ///< i64 subtraction marker
MUL64_MARKER, ///< i64 multiply marker
LAST_SPUISD ///< Last user-defined instruction
};
}
//! Utility functions specific to CellSPU:
namespace SPU {
SDValue get_vec_u18imm(SDNode *N, SelectionDAG &DAG,
EVT ValueType);
SDValue get_vec_i16imm(SDNode *N, SelectionDAG &DAG,
EVT ValueType);
SDValue get_vec_i10imm(SDNode *N, SelectionDAG &DAG,
EVT ValueType);
SDValue get_vec_i8imm(SDNode *N, SelectionDAG &DAG,
EVT ValueType);
SDValue get_ILHUvec_imm(SDNode *N, SelectionDAG &DAG,
EVT ValueType);
SDValue get_v4i32_imm(SDNode *N, SelectionDAG &DAG);
SDValue get_v2i64_imm(SDNode *N, SelectionDAG &DAG);
SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG,
const SPUTargetMachine &TM);
//! Simplify a EVT::v2i64 constant splat to CellSPU-ready form
SDValue LowerV2I64Splat(EVT OpVT, SelectionDAG &DAG, uint64_t splat,
DebugLoc dl);
}
class SPUTargetMachine; // forward dec'l.
class SPUTargetLowering :
public TargetLowering
{
int VarArgsFrameIndex; // FrameIndex for start of varargs area.
SPUTargetMachine &SPUTM;
public:
//! The venerable constructor
/*!
This is where the CellSPU backend sets operation handling (i.e., legal,
custom, expand or promote.)
*/
SPUTargetLowering(SPUTargetMachine &TM);
//! Get the target machine
SPUTargetMachine &getSPUTargetMachine() {
return SPUTM;
}
/// getTargetNodeName() - This method returns the name of a target specific
/// DAG node.
virtual const char *getTargetNodeName(unsigned Opcode) const;
/// getSetCCResultType - Return the ValueType for ISD::SETCC
virtual EVT getSetCCResultType(EVT VT) const;
virtual MVT getShiftAmountTy(EVT LHSTy) const { return MVT::i32; }
//! Custom lowering hooks
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
//! Custom lowering hook for nodes with illegal result types.
virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG) const;
virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
virtual void computeMaskedBitsForTargetNode(const SDValue Op,
const APInt &Mask,
APInt &KnownZero,
APInt &KnownOne,
const SelectionDAG &DAG,
unsigned Depth = 0) const;
virtual unsigned ComputeNumSignBitsForTargetNode(SDValue Op,
unsigned Depth = 0) const;
ConstraintType getConstraintType(const std::string &ConstraintLetter) const;
/// Examine constraint string and operand type and determine a weight value.
/// The operand object must already have been set up with the operand type.
ConstraintWeight getSingleConstraintMatchWeight(
AsmOperandInfo &info, const char *constraint) const;
std::pair<unsigned, const TargetRegisterClass*>
getRegForInlineAsmConstraint(const std::string &Constraint,
EVT VT) const;
void LowerAsmOperandForConstraint(SDValue Op, std::string &Constraint,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) const;
/// isLegalAddressImmediate - Return true if the integer value can be used
/// as the offset of the target addressing mode.
virtual bool isLegalAddressImmediate(int64_t V, Type *Ty) const;
virtual bool isLegalAddressImmediate(GlobalValue *) const;
virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
virtual SDValue
LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
virtual SDValue
LowerCall(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool &isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const;
virtual SDValue
LowerReturn(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
DebugLoc dl, SelectionDAG &DAG) const;
virtual bool isLegalICmpImmediate(int64_t Imm) const;
virtual bool isLegalAddressingMode(const AddrMode &AM,
Type *Ty) const;
};
}
#endif
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