1 //===-- ARMISelLowering.h - ARM 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 ARM uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef ARMISELLOWERING_H
16 #define ARMISELLOWERING_H
18 #include "ARMSubtarget.h"
19 #include "llvm/Target/TargetLowering.h"
20 #include "llvm/CodeGen/SelectionDAG.h"
21 #include "llvm/CodeGen/CallingConvLower.h"
25 class ARMConstantPoolValue;
28 // ARM Specific DAG Nodes
30 // Start the numbering where the builtin ops and target ops leave off.
31 FIRST_NUMBER = ISD::BUILTIN_OP_END,
33 Wrapper, // Wrapper - A wrapper node for TargetConstantPool,
34 // TargetExternalSymbol, and TargetGlobalAddress.
35 WrapperJT, // WrapperJT - A wrapper node for TargetJumpTable
37 CALL, // Function call.
38 CALL_PRED, // Function call that's predicable.
39 CALL_NOLINK, // Function call with branch not branch-and-link.
40 tCALL, // Thumb function call.
41 BRCOND, // Conditional branch.
42 BR_JT, // Jumptable branch.
43 BR2_JT, // Jumptable branch (2 level - jumptable entry is a jump).
44 RET_FLAG, // Return with a flag operand.
46 PIC_ADD, // Add with a PC operand and a PIC label.
48 CMP, // ARM compare instructions.
49 CMPZ, // ARM compare that sets only Z flag.
50 CMPFP, // ARM VFP compare instruction, sets FPSCR.
51 CMPFPw0, // ARM VFP compare against zero instruction, sets FPSCR.
52 FMSTAT, // ARM fmstat instruction.
53 CMOV, // ARM conditional move instructions.
54 CNEG, // ARM conditional negate instructions.
56 FTOSI, // FP to sint within a FP register.
57 FTOUI, // FP to uint within a FP register.
58 SITOF, // sint to FP within a FP register.
59 UITOF, // uint to FP within a FP register.
61 SRL_FLAG, // V,Flag = srl_flag X -> srl X, 1 + save carry out.
62 SRA_FLAG, // V,Flag = sra_flag X -> sra X, 1 + save carry out.
63 RRX, // V = RRX X, Flag -> srl X, 1 + shift in carry flag.
65 FMRRD, // double to two gprs.
66 FMDRR, // Two gprs to double.
68 EH_SJLJ_SETJMP, // SjLj exception handling setjmp.
69 EH_SJLJ_LONGJMP, // SjLj exception handling longjmp.
73 DYN_ALLOC, // Dynamic allocation on the stack.
75 VCEQ, // Vector compare equal.
76 VCGE, // Vector compare greater than or equal.
77 VCGEU, // Vector compare unsigned greater than or equal.
78 VCGT, // Vector compare greater than.
79 VCGTU, // Vector compare unsigned greater than.
80 VTST, // Vector test bits.
82 // Vector shift by immediate:
84 VSHRs, // ...right (signed)
85 VSHRu, // ...right (unsigned)
86 VSHLLs, // ...left long (signed)
87 VSHLLu, // ...left long (unsigned)
88 VSHLLi, // ...left long (with maximum shift count)
89 VSHRN, // ...right narrow
91 // Vector rounding shift by immediate:
92 VRSHRs, // ...right (signed)
93 VRSHRu, // ...right (unsigned)
94 VRSHRN, // ...right narrow
96 // Vector saturating shift by immediate:
97 VQSHLs, // ...left (signed)
98 VQSHLu, // ...left (unsigned)
99 VQSHLsu, // ...left (signed to unsigned)
100 VQSHRNs, // ...right narrow (signed)
101 VQSHRNu, // ...right narrow (unsigned)
102 VQSHRNsu, // ...right narrow (signed to unsigned)
104 // Vector saturating rounding shift by immediate:
105 VQRSHRNs, // ...right narrow (signed)
106 VQRSHRNu, // ...right narrow (unsigned)
107 VQRSHRNsu, // ...right narrow (signed to unsigned)
109 // Vector shift and insert:
113 // Vector get lane (VMOV scalar to ARM core register)
114 // (These are used for 8- and 16-bit element types only.)
115 VGETLANEu, // zero-extend vector extract element
116 VGETLANEs, // sign-extend vector extract element
122 // Vector load/store with (de)interleaving
132 VREV64, // reverse elements within 64-bit doublewords
133 VREV32, // reverse elements within 32-bit words
134 VREV16 // reverse elements within 16-bit halfwords
138 /// Define some predicates that are used for node matching.
140 /// getVMOVImm - If this is a build_vector of constants which can be
141 /// formed by using a VMOV instruction of the specified element size,
142 /// return the constant being splatted. The ByteSize field indicates the
143 /// number of bytes of each element [1248].
144 SDValue getVMOVImm(SDNode *N, unsigned ByteSize, SelectionDAG &DAG);
147 //===--------------------------------------------------------------------===//
148 // ARMTargetLowering - ARM Implementation of the TargetLowering interface
150 class ARMTargetLowering : public TargetLowering {
151 int VarArgsFrameIndex; // FrameIndex for start of varargs area.
153 explicit ARMTargetLowering(TargetMachine &TM);
155 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
157 /// ReplaceNodeResults - Replace the results of node with an illegal result
158 /// type with new values built out of custom code.
160 virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
163 virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
165 virtual const char *getTargetNodeName(unsigned Opcode) const;
167 virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
168 MachineBasicBlock *MBB) const;
170 /// allowsUnalignedMemoryAccesses - Returns true if the target allows
171 /// unaligned memory accesses. of the specified type.
172 /// FIXME: Add getOptimalMemOpType to implement memcpy with NEON?
173 virtual bool allowsUnalignedMemoryAccesses(EVT VT) const;
175 /// isLegalAddressingMode - Return true if the addressing mode represented
176 /// by AM is legal for this target, for a load/store of the specified type.
177 virtual bool isLegalAddressingMode(const AddrMode &AM, const Type *Ty)const;
178 bool isLegalT2ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
180 /// getPreIndexedAddressParts - returns true by value, base pointer and
181 /// offset pointer and addressing mode by reference if the node's address
182 /// can be legally represented as pre-indexed load / store address.
183 virtual bool getPreIndexedAddressParts(SDNode *N, SDValue &Base,
185 ISD::MemIndexedMode &AM,
186 SelectionDAG &DAG) const;
188 /// getPostIndexedAddressParts - returns true by value, base pointer and
189 /// offset pointer and addressing mode by reference if this node can be
190 /// combined with a load / store to form a post-indexed load / store.
191 virtual bool getPostIndexedAddressParts(SDNode *N, SDNode *Op,
192 SDValue &Base, SDValue &Offset,
193 ISD::MemIndexedMode &AM,
194 SelectionDAG &DAG) const;
196 virtual void computeMaskedBitsForTargetNode(const SDValue Op,
200 const SelectionDAG &DAG,
201 unsigned Depth) const;
204 ConstraintType getConstraintType(const std::string &Constraint) const;
205 std::pair<unsigned, const TargetRegisterClass*>
206 getRegForInlineAsmConstraint(const std::string &Constraint,
208 std::vector<unsigned>
209 getRegClassForInlineAsmConstraint(const std::string &Constraint,
212 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
213 /// vector. If it is invalid, don't add anything to Ops. If hasMemory is
214 /// true it means one of the asm constraint of the inline asm instruction
215 /// being processed is 'm'.
216 virtual void LowerAsmOperandForConstraint(SDValue Op,
217 char ConstraintLetter,
219 std::vector<SDValue> &Ops,
220 SelectionDAG &DAG) const;
222 virtual const ARMSubtarget* getSubtarget() {
226 /// getFunctionAlignment - Return the Log2 alignment of this function.
227 virtual unsigned getFunctionAlignment(const Function *F) const;
229 bool isShuffleMaskLegal(const SmallVectorImpl<int> &M, EVT VT) const;
231 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
232 /// make the right decision when generating code for different targets.
233 const ARMSubtarget *Subtarget;
235 /// ARMPCLabelIndex - Keep track of the number of ARM PC labels created.
237 unsigned ARMPCLabelIndex;
239 void addTypeForNEON(EVT VT, EVT PromotedLdStVT, EVT PromotedBitwiseVT);
240 void addDRTypeForNEON(EVT VT);
241 void addQRTypeForNEON(EVT VT);
243 typedef SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPassVector;
244 void PassF64ArgInRegs(DebugLoc dl, SelectionDAG &DAG,
245 SDValue Chain, SDValue &Arg,
246 RegsToPassVector &RegsToPass,
247 CCValAssign &VA, CCValAssign &NextVA,
249 SmallVector<SDValue, 8> &MemOpChains,
250 ISD::ArgFlagsTy Flags);
251 SDValue GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
252 SDValue &Root, SelectionDAG &DAG, DebugLoc dl);
254 CCAssignFn *CCAssignFnForNode(unsigned CC, bool Return, bool isVarArg) const;
255 SDValue LowerMemOpCallTo(SDValue Chain, SDValue StackPtr, SDValue Arg,
256 DebugLoc dl, SelectionDAG &DAG,
257 const CCValAssign &VA,
258 ISD::ArgFlagsTy Flags);
259 SDValue LowerINTRINSIC_W_CHAIN(SDValue Op, SelectionDAG &DAG);
260 SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG);
261 SDValue LowerGlobalAddressDarwin(SDValue Op, SelectionDAG &DAG);
262 SDValue LowerGlobalAddressELF(SDValue Op, SelectionDAG &DAG);
263 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG);
264 SDValue LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
266 SDValue LowerToTLSExecModels(GlobalAddressSDNode *GA,
268 SDValue LowerGLOBAL_OFFSET_TABLE(SDValue Op, SelectionDAG &DAG);
269 SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG);
270 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG);
271 SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG);
273 SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl,
275 SDValue Dst, SDValue Src,
276 SDValue Size, unsigned Align,
278 const Value *DstSV, uint64_t DstSVOff,
279 const Value *SrcSV, uint64_t SrcSVOff);
280 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
281 unsigned CallConv, bool isVarArg,
282 const SmallVectorImpl<ISD::InputArg> &Ins,
283 DebugLoc dl, SelectionDAG &DAG,
284 SmallVectorImpl<SDValue> &InVals);
287 LowerFormalArguments(SDValue Chain,
288 unsigned CallConv, bool isVarArg,
289 const SmallVectorImpl<ISD::InputArg> &Ins,
290 DebugLoc dl, SelectionDAG &DAG,
291 SmallVectorImpl<SDValue> &InVals);
294 LowerCall(SDValue Chain, SDValue Callee,
295 unsigned CallConv, bool isVarArg,
297 const SmallVectorImpl<ISD::OutputArg> &Outs,
298 const SmallVectorImpl<ISD::InputArg> &Ins,
299 DebugLoc dl, SelectionDAG &DAG,
300 SmallVectorImpl<SDValue> &InVals);
303 LowerReturn(SDValue Chain,
304 unsigned CallConv, bool isVarArg,
305 const SmallVectorImpl<ISD::OutputArg> &Outs,
306 DebugLoc dl, SelectionDAG &DAG);
310 #endif // ARMISELLOWERING_H