1 //===-- PPCISelLowering.h - PPC32 DAG Lowering Interface --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that PPC uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TARGET_POWERPC_PPC32ISELLOWERING_H
16 #define LLVM_TARGET_POWERPC_PPC32ISELLOWERING_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+PPC::INSTRUCTION_LIST_END,
28 /// FSEL - Traditional three-operand fsel node.
32 /// FCFID - The FCFID instruction, taking an f64 operand and producing
33 /// and f64 value containing the FP representation of the integer that
34 /// was temporarily in the f64 operand.
37 /// FCTI[D,W]Z - The FCTIDZ and FCTIWZ instructions, taking an f32 or f64
38 /// operand, producing an f64 value containing the integer representation
42 /// STFIWX - The STFIWX instruction. The first operand is an input token
43 /// chain, then an f64 value to store, then an address to store it to,
44 /// then a SRCVALUE for the address.
47 // VMADDFP, VNMSUBFP - The VMADDFP and VNMSUBFP instructions, taking
48 // three v4f32 operands and producing a v4f32 result.
51 /// VPERM - The PPC VPERM Instruction.
55 /// Hi/Lo - These represent the high and low 16-bit parts of a global
56 /// address respectively. These nodes have two operands, the first of
57 /// which must be a TargetGlobalAddress, and the second of which must be a
58 /// Constant. Selected naively, these turn into 'lis G+C' and 'li G+C',
59 /// though these are usually folded into other nodes.
62 /// GlobalBaseReg - On Darwin, this node represents the result of the mflr
63 /// at function entry, used for PIC code.
66 /// These nodes represent the 32-bit PPC shifts that operate on 6-bit
67 /// shift amounts. These nodes are generated by the multi-precision shift
71 /// EXTSW_32 - This is the EXTSW instruction for use with "32-bit"
75 /// STD_32 - This is the STD instruction for use with "32-bit" registers.
78 /// CALL - A function call.
81 /// Return with a flag operand, matched by 'blr'
84 /// R32 = MFCR(CRREG, INFLAG) - Represents the MFCR/MFOCRF instructions.
85 /// This copies the bits corresponding to the specified CRREG into the
86 /// resultant GPR. Bits corresponding to other CR regs are undefined.
89 /// RESVEC = VCMP(LHS, RHS, OPC) - Represents one of the altivec VCMP*
90 /// instructions. For lack of better number, we use the opcode number
91 /// encoding for the OPC field to identify the compare. For example, 838
95 /// RESVEC, OUTFLAG = VCMPo(LHS, RHS, OPC) - Represents one of the
96 /// altivec VCMP*o instructions. For lack of better number, we use the
97 /// opcode number encoding for the OPC field to identify the compare. For
98 /// example, 838 is VCMPGTSH.
103 /// Define some predicates that are used for node matching.
105 /// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
106 /// specifies a splat of a single element that is suitable for input to
107 /// VSPLTB/VSPLTH/VSPLTW.
108 bool isSplatShuffleMask(SDNode *N, unsigned EltSize);
110 /// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
111 /// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
112 unsigned getVSPLTImmediate(SDNode *N, unsigned EltSize);
114 /// isVecSplatImm - Return true if this is a build_vector of constants which
115 /// can be formed by using a vspltis[bhw] instruction. The ByteSize field
116 /// indicates the number of bytes of each element [124] -> [bhw].
117 bool isVecSplatImm(SDNode *N, unsigned ByteSize, char *Val = 0);
120 class PPCTargetLowering : public TargetLowering {
121 int VarArgsFrameIndex; // FrameIndex for start of varargs area.
122 int ReturnAddrIndex; // FrameIndex for return slot.
124 PPCTargetLowering(TargetMachine &TM);
126 /// getTargetNodeName() - This method returns the name of a target specific
128 virtual const char *getTargetNodeName(unsigned Opcode) const;
130 /// LowerOperation - Provide custom lowering hooks for some operations.
132 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
134 virtual SDOperand PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
136 virtual void computeMaskedBitsForTargetNode(const SDOperand Op,
140 unsigned Depth = 0) const;
141 /// LowerArguments - This hook must be implemented to indicate how we should
142 /// lower the arguments for the specified function, into the specified DAG.
143 virtual std::vector<SDOperand>
144 LowerArguments(Function &F, SelectionDAG &DAG);
146 /// LowerCallTo - This hook lowers an abstract call to a function into an
148 virtual std::pair<SDOperand, SDOperand>
149 LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg,
151 bool isTailCall, SDOperand Callee, ArgListTy &Args,
154 virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI,
155 MachineBasicBlock *MBB);
157 ConstraintType getConstraintType(char ConstraintLetter) const;
158 std::vector<unsigned>
159 getRegClassForInlineAsmConstraint(const std::string &Constraint,
160 MVT::ValueType VT) const;
161 bool isOperandValidForConstraint(SDOperand Op, char ConstraintLetter);
163 /// isLegalAddressImmediate - Return true if the integer value can be used
164 /// as the offset of the target addressing mode.
165 virtual bool isLegalAddressImmediate(int64_t V) const;
169 #endif // LLVM_TARGET_POWERPC_PPC32ISELLOWERING_H