1 //===-- llvm/CodeGen/SelectionDAG.h - InstSelection DAG ---------*- 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 declares the SelectionDAG class, and transitively defines the
11 // SDNode class and subclasses.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CODEGEN_SELECTIONDAG_H
16 #define LLVM_CODEGEN_SELECTIONDAG_H
18 #include "llvm/ADT/FoldingSet.h"
19 #include "llvm/ADT/ilist"
20 #include "llvm/CodeGen/SelectionDAGNodes.h"
32 class MachineModuleInfo;
33 class MachineFunction;
34 class MachineConstantPoolValue;
36 /// SelectionDAG class - This is used to represent a portion of an LLVM function
37 /// in a low-level Data Dependence DAG representation suitable for instruction
38 /// selection. This DAG is constructed as the first step of instruction
39 /// selection in order to allow implementation of machine specific optimizations
40 /// and code simplifications.
42 /// The representation used by the SelectionDAG is a target-independent
43 /// representation, which has some similarities to the GCC RTL representation,
44 /// but is significantly more simple, powerful, and is a graph form instead of a
50 MachineModuleInfo *MMI;
52 /// Root - The root of the entire DAG. EntryNode - The starting token.
53 SDOperand Root, EntryNode;
55 /// AllNodes - A linked list of nodes in the current DAG.
56 ilist<SDNode> AllNodes;
58 /// CSEMap - This structure is used to memoize nodes, automatically performing
59 /// CSE with existing nodes with a duplicate is requested.
60 FoldingSet<SDNode> CSEMap;
63 SelectionDAG(TargetLowering &tli, MachineFunction &mf, MachineModuleInfo *mmi)
64 : TLI(tli), MF(mf), MMI(mmi) {
65 EntryNode = Root = getNode(ISD::EntryToken, MVT::Other);
69 MachineFunction &getMachineFunction() const { return MF; }
70 const TargetMachine &getTarget() const;
71 TargetLowering &getTargetLoweringInfo() const { return TLI; }
72 MachineModuleInfo *getMachineModuleInfo() const { return MMI; }
74 /// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'.
79 std::map<const SDNode *, std::string> NodeGraphAttrs;
82 /// clearGraphAttrs - Clear all previously defined node graph attributes.
83 /// Intended to be used from a debugging tool (eg. gdb).
84 void clearGraphAttrs();
86 /// setGraphAttrs - Set graph attributes for a node. (eg. "color=red".)
88 void setGraphAttrs(const SDNode *N, const char *Attrs);
90 /// getGraphAttrs - Get graph attributes for a node. (eg. "color=red".)
91 /// Used from getNodeAttributes.
92 const std::string getGraphAttrs(const SDNode *N) const;
94 /// setGraphColor - Convenience for setting node color attribute.
96 void setGraphColor(const SDNode *N, const char *Color);
98 typedef ilist<SDNode>::const_iterator allnodes_const_iterator;
99 allnodes_const_iterator allnodes_begin() const { return AllNodes.begin(); }
100 allnodes_const_iterator allnodes_end() const { return AllNodes.end(); }
101 typedef ilist<SDNode>::iterator allnodes_iterator;
102 allnodes_iterator allnodes_begin() { return AllNodes.begin(); }
103 allnodes_iterator allnodes_end() { return AllNodes.end(); }
105 /// getRoot - Return the root tag of the SelectionDAG.
107 const SDOperand &getRoot() const { return Root; }
109 /// getEntryNode - Return the token chain corresponding to the entry of the
111 const SDOperand &getEntryNode() const { return EntryNode; }
113 /// setRoot - Set the current root tag of the SelectionDAG.
115 const SDOperand &setRoot(SDOperand N) { return Root = N; }
117 /// Combine - This iterates over the nodes in the SelectionDAG, folding
118 /// certain types of nodes together, or eliminating superfluous nodes. When
119 /// the AfterLegalize argument is set to 'true', Combine takes care not to
120 /// generate any nodes that will be illegal on the target.
121 void Combine(bool AfterLegalize, AliasAnalysis &AA);
123 /// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
124 /// only uses types natively supported by the target.
126 /// Note that this is an involved process that may invalidate pointers into
128 void LegalizeTypes();
130 /// Legalize - This transforms the SelectionDAG into a SelectionDAG that is
131 /// compatible with the target instruction selector, as indicated by the
132 /// TargetLowering object.
134 /// Note that this is an involved process that may invalidate pointers into
138 /// RemoveDeadNodes - This method deletes all unreachable nodes in the
140 void RemoveDeadNodes();
142 /// RemoveDeadNode - Remove the specified node from the system. If any of its
143 /// operands then becomes dead, remove them as well. The vector Deleted is
144 /// populated with nodes that are deleted.
145 void RemoveDeadNode(SDNode *N, std::vector<SDNode*> &Deleted);
147 /// DeleteNode - Remove the specified node from the system. This node must
148 /// have no referrers.
149 void DeleteNode(SDNode *N);
151 /// getVTList - Return an SDVTList that represents the list of values
153 SDVTList getVTList(MVT::ValueType VT);
154 SDVTList getVTList(MVT::ValueType VT1, MVT::ValueType VT2);
155 SDVTList getVTList(MVT::ValueType VT1, MVT::ValueType VT2,MVT::ValueType VT3);
156 SDVTList getVTList(const MVT::ValueType *VTs, unsigned NumVTs);
158 /// getNodeValueTypes - These are obsolete, use getVTList instead.
159 const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT) {
160 return getVTList(VT).VTs;
162 const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1,
163 MVT::ValueType VT2) {
164 return getVTList(VT1, VT2).VTs;
166 const MVT::ValueType *getNodeValueTypes(MVT::ValueType VT1,MVT::ValueType VT2,
167 MVT::ValueType VT3) {
168 return getVTList(VT1, VT2, VT3).VTs;
170 const MVT::ValueType *getNodeValueTypes(std::vector<MVT::ValueType> &VTList) {
171 return getVTList(&VTList[0], VTList.size()).VTs;
175 //===--------------------------------------------------------------------===//
176 // Node creation methods.
178 SDOperand getString(const std::string &Val);
179 SDOperand getConstant(uint64_t Val, MVT::ValueType VT, bool isTarget = false);
180 SDOperand getIntPtrConstant(uint64_t Val, bool isTarget = false);
181 SDOperand getTargetConstant(uint64_t Val, MVT::ValueType VT) {
182 return getConstant(Val, VT, true);
184 SDOperand getConstantFP(double Val, MVT::ValueType VT, bool isTarget = false);
185 SDOperand getConstantFP(const APFloat& Val, MVT::ValueType VT,
186 bool isTarget = false);
187 SDOperand getTargetConstantFP(double Val, MVT::ValueType VT) {
188 return getConstantFP(Val, VT, true);
190 SDOperand getTargetConstantFP(const APFloat& Val, MVT::ValueType VT) {
191 return getConstantFP(Val, VT, true);
193 SDOperand getGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
194 int offset = 0, bool isTargetGA = false);
195 SDOperand getTargetGlobalAddress(const GlobalValue *GV, MVT::ValueType VT,
197 return getGlobalAddress(GV, VT, offset, true);
199 SDOperand getFrameIndex(int FI, MVT::ValueType VT, bool isTarget = false);
200 SDOperand getTargetFrameIndex(int FI, MVT::ValueType VT) {
201 return getFrameIndex(FI, VT, true);
203 SDOperand getJumpTable(int JTI, MVT::ValueType VT, bool isTarget = false);
204 SDOperand getTargetJumpTable(int JTI, MVT::ValueType VT) {
205 return getJumpTable(JTI, VT, true);
207 SDOperand getConstantPool(Constant *C, MVT::ValueType VT,
208 unsigned Align = 0, int Offs = 0, bool isT=false);
209 SDOperand getTargetConstantPool(Constant *C, MVT::ValueType VT,
210 unsigned Align = 0, int Offset = 0) {
211 return getConstantPool(C, VT, Align, Offset, true);
213 SDOperand getConstantPool(MachineConstantPoolValue *C, MVT::ValueType VT,
214 unsigned Align = 0, int Offs = 0, bool isT=false);
215 SDOperand getTargetConstantPool(MachineConstantPoolValue *C,
216 MVT::ValueType VT, unsigned Align = 0,
218 return getConstantPool(C, VT, Align, Offset, true);
220 SDOperand getBasicBlock(MachineBasicBlock *MBB);
221 SDOperand getExternalSymbol(const char *Sym, MVT::ValueType VT);
222 SDOperand getTargetExternalSymbol(const char *Sym, MVT::ValueType VT);
223 SDOperand getValueType(MVT::ValueType);
224 SDOperand getRegister(unsigned Reg, MVT::ValueType VT);
226 SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N) {
227 return getNode(ISD::CopyToReg, MVT::Other, Chain,
228 getRegister(Reg, N.getValueType()), N);
231 // This version of the getCopyToReg method takes an extra operand, which
232 // indicates that there is potentially an incoming flag value (if Flag is not
233 // null) and that there should be a flag result.
234 SDOperand getCopyToReg(SDOperand Chain, unsigned Reg, SDOperand N,
236 const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
237 SDOperand Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Flag };
238 return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.Val ? 4 : 3);
241 // Similar to last getCopyToReg() except parameter Reg is a SDOperand
242 SDOperand getCopyToReg(SDOperand Chain, SDOperand Reg, SDOperand N,
244 const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
245 SDOperand Ops[] = { Chain, Reg, N, Flag };
246 return getNode(ISD::CopyToReg, VTs, 2, Ops, Flag.Val ? 4 : 3);
249 SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT) {
250 const MVT::ValueType *VTs = getNodeValueTypes(VT, MVT::Other);
251 SDOperand Ops[] = { Chain, getRegister(Reg, VT) };
252 return getNode(ISD::CopyFromReg, VTs, 2, Ops, 2);
255 // This version of the getCopyFromReg method takes an extra operand, which
256 // indicates that there is potentially an incoming flag value (if Flag is not
257 // null) and that there should be a flag result.
258 SDOperand getCopyFromReg(SDOperand Chain, unsigned Reg, MVT::ValueType VT,
260 const MVT::ValueType *VTs = getNodeValueTypes(VT, MVT::Other, MVT::Flag);
261 SDOperand Ops[] = { Chain, getRegister(Reg, VT), Flag };
262 return getNode(ISD::CopyFromReg, VTs, 3, Ops, Flag.Val ? 3 : 2);
265 SDOperand getCondCode(ISD::CondCode Cond);
267 /// getZeroExtendInReg - Return the expression required to zero extend the Op
268 /// value assuming it was the smaller SrcTy value.
269 SDOperand getZeroExtendInReg(SDOperand Op, MVT::ValueType SrcTy);
271 /// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
272 /// a flag result (to ensure it's not CSE'd).
273 SDOperand getCALLSEQ_START(SDOperand Chain, SDOperand Op) {
274 const MVT::ValueType *VTs = getNodeValueTypes(MVT::Other, MVT::Flag);
275 SDOperand Ops[] = { Chain, Op };
276 return getNode(ISD::CALLSEQ_START, VTs, 2, Ops, 2);
279 /// getCALLSEQ_END - Return a new CALLSEQ_END node, which always must have a
280 /// flag result (to ensure it's not CSE'd).
281 SDOperand getCALLSEQ_END(SDOperand Chain, SDOperand Op1, SDOperand Op2,
283 SDVTList NodeTys = getVTList(MVT::Other, MVT::Flag);
284 SmallVector<SDOperand, 4> Ops;
285 Ops.push_back(Chain);
288 Ops.push_back(InFlag);
289 return getNode(ISD::CALLSEQ_END, NodeTys, &Ops[0],
290 Ops.size() - (InFlag.Val == 0 ? 1 : 0));
293 /// getNode - Gets or creates the specified node.
295 SDOperand getNode(unsigned Opcode, MVT::ValueType VT);
296 SDOperand getNode(unsigned Opcode, MVT::ValueType VT, SDOperand N);
297 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
298 SDOperand N1, SDOperand N2);
299 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
300 SDOperand N1, SDOperand N2, SDOperand N3);
301 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
302 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
303 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
304 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
306 SDOperand getNode(unsigned Opcode, MVT::ValueType VT,
307 const SDOperand *Ops, unsigned NumOps);
308 SDOperand getNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
309 const SDOperand *Ops, unsigned NumOps);
310 SDOperand getNode(unsigned Opcode, const MVT::ValueType *VTs, unsigned NumVTs,
311 const SDOperand *Ops, unsigned NumOps);
312 SDOperand getNode(unsigned Opcode, SDVTList VTs);
313 SDOperand getNode(unsigned Opcode, SDVTList VTs, SDOperand N);
314 SDOperand getNode(unsigned Opcode, SDVTList VTs,
315 SDOperand N1, SDOperand N2);
316 SDOperand getNode(unsigned Opcode, SDVTList VTs,
317 SDOperand N1, SDOperand N2, SDOperand N3);
318 SDOperand getNode(unsigned Opcode, SDVTList VTs,
319 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4);
320 SDOperand getNode(unsigned Opcode, SDVTList VTs,
321 SDOperand N1, SDOperand N2, SDOperand N3, SDOperand N4,
323 SDOperand getNode(unsigned Opcode, SDVTList VTs,
324 const SDOperand *Ops, unsigned NumOps);
326 SDOperand getMemcpy(SDOperand Chain, SDOperand Dest, SDOperand Src,
327 SDOperand Size, SDOperand Align,
328 SDOperand AlwaysInline);
330 SDOperand getMemmove(SDOperand Chain, SDOperand Dest, SDOperand Src,
331 SDOperand Size, SDOperand Align,
332 SDOperand AlwaysInline);
334 SDOperand getMemset(SDOperand Chain, SDOperand Dest, SDOperand Src,
335 SDOperand Size, SDOperand Align,
336 SDOperand AlwaysInline);
338 /// getSetCC - Helper function to make it easier to build SetCC's if you just
339 /// have an ISD::CondCode instead of an SDOperand.
341 SDOperand getSetCC(MVT::ValueType VT, SDOperand LHS, SDOperand RHS,
342 ISD::CondCode Cond) {
343 return getNode(ISD::SETCC, VT, LHS, RHS, getCondCode(Cond));
346 /// getSelectCC - Helper function to make it easier to build SelectCC's if you
347 /// just have an ISD::CondCode instead of an SDOperand.
349 SDOperand getSelectCC(SDOperand LHS, SDOperand RHS,
350 SDOperand True, SDOperand False, ISD::CondCode Cond) {
351 return getNode(ISD::SELECT_CC, True.getValueType(), LHS, RHS, True, False,
355 /// getVAArg - VAArg produces a result and token chain, and takes a pointer
356 /// and a source value as input.
357 SDOperand getVAArg(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
360 /// getLoad - Loads are not normal binary operators: their result type is not
361 /// determined by their operands, and they produce a value AND a token chain.
363 SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
364 const Value *SV, int SVOffset, bool isVolatile=false,
365 unsigned Alignment=0);
366 SDOperand getExtLoad(ISD::LoadExtType ExtType, MVT::ValueType VT,
367 SDOperand Chain, SDOperand Ptr, const Value *SV,
368 int SVOffset, MVT::ValueType EVT, bool isVolatile=false,
369 unsigned Alignment=0);
370 SDOperand getIndexedLoad(SDOperand OrigLoad, SDOperand Base,
371 SDOperand Offset, ISD::MemIndexedMode AM);
373 /// getStore - Helper function to build ISD::STORE nodes.
375 SDOperand getStore(SDOperand Chain, SDOperand Val, SDOperand Ptr,
376 const Value *SV, int SVOffset, bool isVolatile=false,
377 unsigned Alignment=0);
378 SDOperand getTruncStore(SDOperand Chain, SDOperand Val, SDOperand Ptr,
379 const Value *SV, int SVOffset, MVT::ValueType TVT,
380 bool isVolatile=false, unsigned Alignment=0);
381 SDOperand getIndexedStore(SDOperand OrigStoe, SDOperand Base,
382 SDOperand Offset, ISD::MemIndexedMode AM);
384 // getSrcValue - Construct a node to track a Value* through the backend.
385 SDOperand getSrcValue(const Value *v);
387 // getMemOperand - Construct a node to track a memory reference
388 // through the backend.
389 SDOperand getMemOperand(const MemOperand &MO);
391 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
392 /// specified operands. If the resultant node already exists in the DAG,
393 /// this does not modify the specified node, instead it returns the node that
394 /// already exists. If the resultant node does not exist in the DAG, the
395 /// input node is returned. As a degenerate case, if you specify the same
396 /// input operands as the node already has, the input node is returned.
397 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op);
398 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2);
399 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
401 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
402 SDOperand Op3, SDOperand Op4);
403 SDOperand UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
404 SDOperand Op3, SDOperand Op4, SDOperand Op5);
405 SDOperand UpdateNodeOperands(SDOperand N, SDOperand *Ops, unsigned NumOps);
407 /// SelectNodeTo - These are used for target selectors to *mutate* the
408 /// specified node to have the specified return type, Target opcode, and
409 /// operands. Note that target opcodes are stored as
410 /// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field. The 0th value
411 /// of the resultant node is returned.
412 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT);
413 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
415 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
416 SDOperand Op1, SDOperand Op2);
417 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
418 SDOperand Op1, SDOperand Op2, SDOperand Op3);
419 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT,
420 const SDOperand *Ops, unsigned NumOps);
421 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
422 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
423 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, MVT::ValueType VT1,
424 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
428 /// getTargetNode - These are used for target selectors to create a new node
429 /// with specified return type(s), target opcode, and operands.
431 /// Note that getTargetNode returns the resultant node. If there is already a
432 /// node of the specified opcode and operands, it returns that node instead of
434 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT);
435 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
437 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
438 SDOperand Op1, SDOperand Op2);
439 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
440 SDOperand Op1, SDOperand Op2, SDOperand Op3);
441 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT,
442 const SDOperand *Ops, unsigned NumOps);
443 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
445 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
446 MVT::ValueType VT2, SDOperand Op1);
447 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
448 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2);
449 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
450 MVT::ValueType VT2, SDOperand Op1, SDOperand Op2,
452 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
454 const SDOperand *Ops, unsigned NumOps);
455 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
456 MVT::ValueType VT2, MVT::ValueType VT3,
457 SDOperand Op1, SDOperand Op2);
458 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
459 MVT::ValueType VT2, MVT::ValueType VT3,
460 SDOperand Op1, SDOperand Op2, SDOperand Op3);
461 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
462 MVT::ValueType VT2, MVT::ValueType VT3,
463 const SDOperand *Ops, unsigned NumOps);
464 SDNode *getTargetNode(unsigned Opcode, MVT::ValueType VT1,
465 MVT::ValueType VT2, MVT::ValueType VT3,
467 const SDOperand *Ops, unsigned NumOps);
468 SDNode *getTargetNode(unsigned Opcode, std::vector<MVT::ValueType> &ResultTys,
469 const SDOperand *Ops, unsigned NumOps);
471 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
472 /// This can cause recursive merging of nodes in the DAG. Use the first
473 /// version if 'From' is known to have a single result, use the second
474 /// if you have two nodes with identical results, use the third otherwise.
476 /// These methods all take an optional vector, which (if not null) is
477 /// populated with any nodes that are deleted from the SelectionDAG, due to
478 /// new equivalences that are discovered.
480 void ReplaceAllUsesWith(SDOperand From, SDOperand Op,
481 std::vector<SDNode*> *Deleted = 0);
482 void ReplaceAllUsesWith(SDNode *From, SDNode *To,
483 std::vector<SDNode*> *Deleted = 0);
484 void ReplaceAllUsesWith(SDNode *From, const SDOperand *To,
485 std::vector<SDNode*> *Deleted = 0);
487 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
488 /// uses of other values produced by From.Val alone. The Deleted vector is
489 /// handled the same was as for ReplaceAllUsesWith, but it is required for
491 void ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
492 std::vector<SDNode*> *Deleted = 0);
494 /// AssignNodeIds - Assign a unique node id for each node in the DAG based on
495 /// their allnodes order. It returns the maximum id.
496 unsigned AssignNodeIds();
498 /// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
499 /// based on their topological order. It returns the maximum id and a vector
500 /// of the SDNodes* in assigned order by reference.
501 unsigned AssignTopologicalOrder(std::vector<SDNode*> &TopOrder);
503 /// isCommutativeBinOp - Returns true if the opcode is a commutative binary
505 static bool isCommutativeBinOp(unsigned Opcode) {
506 // FIXME: This should get its info from the td file, so that we can include
521 case ISD::ADDE: return true;
522 default: return false;
528 /// CreateStackTemporary - Create a stack temporary, suitable for holding the
529 /// specified value type.
530 SDOperand CreateStackTemporary(MVT::ValueType VT);
532 /// FoldSetCC - Constant fold a setcc to true or false.
533 SDOperand FoldSetCC(MVT::ValueType VT, SDOperand N1,
534 SDOperand N2, ISD::CondCode Cond);
536 /// MaskedValueIsZero - Return true if 'Op & Mask' is known to be zero. We
537 /// use this predicate to simplify operations downstream. Op and Mask are
538 /// known to be the same type.
539 bool MaskedValueIsZero(SDOperand Op, uint64_t Mask, unsigned Depth = 0)
542 /// ComputeMaskedBits - Determine which of the bits specified in Mask are
543 /// known to be either zero or one and return them in the KnownZero/KnownOne
544 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit
545 /// processing. Targets can implement the computeMaskedBitsForTargetNode
546 /// method in the TargetLowering class to allow target nodes to be understood.
547 void ComputeMaskedBits(SDOperand Op, uint64_t Mask, uint64_t &KnownZero,
548 uint64_t &KnownOne, unsigned Depth = 0) const;
550 /// ComputeNumSignBits - Return the number of times the sign bit of the
551 /// register is replicated into the other bits. We know that at least 1 bit
552 /// is always equal to the sign bit (itself), but other cases can give us
553 /// information. For example, immediately after an "SRA X, 2", we know that
554 /// the top 3 bits are all equal to each other, so we return 3. Targets can
555 /// implement the ComputeNumSignBitsForTarget method in the TargetLowering
556 /// class to allow target nodes to be understood.
557 unsigned ComputeNumSignBits(SDOperand Op, unsigned Depth = 0) const;
560 void RemoveNodeFromCSEMaps(SDNode *N);
561 SDNode *AddNonLeafNodeToCSEMaps(SDNode *N);
562 SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op, void *&InsertPos);
563 SDNode *FindModifiedNodeSlot(SDNode *N, SDOperand Op1, SDOperand Op2,
565 SDNode *FindModifiedNodeSlot(SDNode *N, const SDOperand *Ops, unsigned NumOps,
568 void DeleteNodeNotInCSEMaps(SDNode *N);
570 // List of non-single value types.
571 std::list<std::vector<MVT::ValueType> > VTList;
573 // Maps to auto-CSE operations.
574 std::vector<CondCodeSDNode*> CondCodeNodes;
576 std::vector<SDNode*> ValueTypeNodes;
577 std::map<MVT::ValueType, SDNode*> ExtendedValueTypeNodes;
578 std::map<std::string, SDNode*> ExternalSymbols;
579 std::map<std::string, SDNode*> TargetExternalSymbols;
580 std::map<std::string, StringSDNode*> StringNodes;
583 template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
584 typedef SelectionDAG::allnodes_iterator nodes_iterator;
585 static nodes_iterator nodes_begin(SelectionDAG *G) {
586 return G->allnodes_begin();
588 static nodes_iterator nodes_end(SelectionDAG *G) {
589 return G->allnodes_end();
593 } // end namespace llvm