1 //===-- SPUISelLowering.h - Cell SPU DAG Lowering Interface -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that Cell SPU uses to lower LLVM code into
13 //===----------------------------------------------------------------------===//
15 #ifndef SPU_ISELLOWERING_H
16 #define SPU_ISELLOWERING_H
18 #include "llvm/Target/TargetLowering.h"
19 #include "llvm/CodeGen/SelectionDAG.h"
25 // Start the numbering where the builting ops and target ops leave off.
26 FIRST_NUMBER = ISD::BUILTIN_OP_END,
28 // Pseudo instructions:
29 RET_FLAG, ///< Return with flag, matched by bi instruction
31 Hi, ///< High address component (upper 16)
32 Lo, ///< Low address component (lower 16)
33 PCRelAddr, ///< Program counter relative address
34 AFormAddr, ///< A-form address (local store)
35 IndirectAddr, ///< D-Form "imm($r)" and X-form "$r($r)"
37 LDRESULT, ///< Load result (value, chain)
38 CALL, ///< CALL instruction
39 SHUFB, ///< Vector shuffle (permute)
40 SHUFFLE_MASK, ///< Shuffle mask
41 CNTB, ///< Count leading ones in bytes
42 PREFSLOT2VEC, ///< Promote scalar->vector
43 VEC2PREFSLOT, ///< Extract element 0
44 SHLQUAD_L_BITS, ///< Rotate quad left, by bits
45 SHLQUAD_L_BYTES, ///< Rotate quad left, by bytes
46 VEC_SHL, ///< Vector shift left
47 VEC_SRL, ///< Vector shift right (logical)
48 VEC_SRA, ///< Vector shift right (arithmetic)
49 VEC_ROTL, ///< Vector rotate left
50 VEC_ROTR, ///< Vector rotate right
51 ROTBYTES_LEFT, ///< Rotate bytes (loads -> ROTQBYI)
52 ROTBYTES_LEFT_BITS, ///< Rotate bytes left by bit shift count
53 SELECT_MASK, ///< Select Mask (FSM, FSMB, FSMH, FSMBI)
54 SELB, ///< Select bits -> (b & mask) | (a & ~mask)
55 // Markers: These aren't used to generate target-dependent nodes, but
56 // are used during instruction selection.
57 ADD64_MARKER, ///< i64 addition marker
58 SUB64_MARKER, ///< i64 subtraction marker
59 MUL64_MARKER, ///< i64 multiply marker
60 LAST_SPUISD ///< Last user-defined instruction
64 /// Predicates that are used for node matching:
66 SDValue get_vec_u18imm(SDNode *N, SelectionDAG &DAG,
68 SDValue get_vec_i16imm(SDNode *N, SelectionDAG &DAG,
70 SDValue get_vec_i10imm(SDNode *N, SelectionDAG &DAG,
72 SDValue get_vec_i8imm(SDNode *N, SelectionDAG &DAG,
74 SDValue get_ILHUvec_imm(SDNode *N, SelectionDAG &DAG,
76 SDValue get_v4i32_imm(SDNode *N, SelectionDAG &DAG);
77 SDValue get_v2i64_imm(SDNode *N, SelectionDAG &DAG);
79 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG,
80 const SPUTargetMachine &TM);
82 SDValue getBorrowGenerateShufMask(SelectionDAG &DAG);
83 SDValue getCarryGenerateShufMask(SelectionDAG &DAG);
86 class SPUTargetMachine; // forward dec'l.
88 class SPUTargetLowering :
91 int VarArgsFrameIndex; // FrameIndex for start of varargs area.
92 int ReturnAddrIndex; // FrameIndex for return slot.
93 SPUTargetMachine &SPUTM;
96 //! The venerable constructor
98 This is where the CellSPU backend sets operation handling (i.e., legal,
99 custom, expand or promote.)
101 SPUTargetLowering(SPUTargetMachine &TM);
103 //! Get the target machine
104 SPUTargetMachine &getSPUTargetMachine() {
108 /// getTargetNodeName() - This method returns the name of a target specific
110 virtual const char *getTargetNodeName(unsigned Opcode) const;
112 /// getSetCCResultType - Return the ValueType for ISD::SETCC
113 virtual MVT getSetCCResultType(MVT VT) const;
115 //! Custom lowering hooks
116 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
118 //! Custom lowering hook for nodes with illegal result types.
119 virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
122 virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
124 virtual void computeMaskedBitsForTargetNode(const SDValue Op,
128 const SelectionDAG &DAG,
129 unsigned Depth = 0) const;
131 virtual unsigned ComputeNumSignBitsForTargetNode(SDValue Op,
132 unsigned Depth = 0) const;
134 ConstraintType getConstraintType(const std::string &ConstraintLetter) const;
136 std::pair<unsigned, const TargetRegisterClass*>
137 getRegForInlineAsmConstraint(const std::string &Constraint,
140 void LowerAsmOperandForConstraint(SDValue Op, char ConstraintLetter,
142 std::vector<SDValue> &Ops,
143 SelectionDAG &DAG) const;
145 /// isLegalAddressImmediate - Return true if the integer value can be used
146 /// as the offset of the target addressing mode.
147 virtual bool isLegalAddressImmediate(int64_t V, const Type *Ty) const;
148 virtual bool isLegalAddressImmediate(GlobalValue *) const;
150 virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;