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/DenseSet.h"
19 #include "llvm/ADT/StringMap.h"
20 #include "llvm/ADT/ilist.h"
21 #include "llvm/CodeGen/DAGCombine.h"
22 #include "llvm/CodeGen/SelectionDAGNodes.h"
23 #include "llvm/Support/RecyclingAllocator.h"
24 #include "llvm/Target/TargetMachine.h"
33 class MachineConstantPoolValue;
34 class MachineFunction;
38 class TargetSelectionDAGInfo;
40 class SDVTListNode : public FoldingSetNode {
41 friend struct FoldingSetTrait<SDVTListNode>;
42 /// FastID - A reference to an Interned FoldingSetNodeID for this node.
43 /// The Allocator in SelectionDAG holds the data.
44 /// SDVTList contains all types which are frequently accessed in SelectionDAG.
45 /// The size of this list is not expected big so it won't introduce memory penalty.
46 FoldingSetNodeIDRef FastID;
49 /// The hash value for SDVTList is fixed so cache it to avoid hash calculation
52 SDVTListNode(const FoldingSetNodeIDRef ID, const EVT *VT, unsigned int Num) :
53 FastID(ID), VTs(VT), NumVTs(Num) {
54 HashValue = ID.ComputeHash();
56 SDVTList getSDVTList() {
57 SDVTList result = {VTs, NumVTs};
62 // Specialize FoldingSetTrait for SDVTListNode
63 // To avoid computing temp FoldingSetNodeID and hash value.
64 template<> struct FoldingSetTrait<SDVTListNode> : DefaultFoldingSetTrait<SDVTListNode> {
65 static void Profile(const SDVTListNode &X, FoldingSetNodeID& ID) {
68 static bool Equals(const SDVTListNode &X, const FoldingSetNodeID &ID,
69 unsigned IDHash, FoldingSetNodeID &TempID) {
70 if (X.HashValue != IDHash)
72 return ID == X.FastID;
74 static unsigned ComputeHash(const SDVTListNode &X, FoldingSetNodeID &TempID) {
79 template<> struct ilist_traits<SDNode> : public ilist_default_traits<SDNode> {
81 mutable ilist_half_node<SDNode> Sentinel;
83 SDNode *createSentinel() const {
84 return static_cast<SDNode*>(&Sentinel);
86 static void destroySentinel(SDNode *) {}
88 SDNode *provideInitialHead() const { return createSentinel(); }
89 SDNode *ensureHead(SDNode*) const { return createSentinel(); }
90 static void noteHead(SDNode*, SDNode*) {}
92 static void deleteNode(SDNode *) {
93 llvm_unreachable("ilist_traits<SDNode> shouldn't see a deleteNode call!");
96 static void createNode(const SDNode &);
99 /// SDDbgInfo - Keeps track of dbg_value information through SDISel. We do
100 /// not build SDNodes for these so as not to perturb the generated code;
101 /// instead the info is kept off to the side in this structure. Each SDNode may
102 /// have one or more associated dbg_value entries. This information is kept in
104 /// Byval parameters are handled separately because they don't use alloca's,
105 /// which busts the normal mechanism. There is good reason for handling all
106 /// parameters separately: they may not have code generated for them, they
107 /// should always go at the beginning of the function regardless of other code
108 /// motion, and debug info for them is potentially useful even if the parameter
109 /// is unused. Right now only byval parameters are handled separately.
111 SmallVector<SDDbgValue*, 32> DbgValues;
112 SmallVector<SDDbgValue*, 32> ByvalParmDbgValues;
113 typedef DenseMap<const SDNode*, SmallVector<SDDbgValue*, 2> > DbgValMapType;
114 DbgValMapType DbgValMap;
116 void operator=(const SDDbgInfo&) LLVM_DELETED_FUNCTION;
117 SDDbgInfo(const SDDbgInfo&) LLVM_DELETED_FUNCTION;
121 void add(SDDbgValue *V, const SDNode *Node, bool isParameter) {
123 ByvalParmDbgValues.push_back(V);
124 } else DbgValues.push_back(V);
126 DbgValMap[Node].push_back(V);
132 ByvalParmDbgValues.clear();
136 return DbgValues.empty() && ByvalParmDbgValues.empty();
139 ArrayRef<SDDbgValue*> getSDDbgValues(const SDNode *Node) {
140 DbgValMapType::iterator I = DbgValMap.find(Node);
141 if (I != DbgValMap.end())
143 return ArrayRef<SDDbgValue*>();
146 typedef SmallVectorImpl<SDDbgValue*>::iterator DbgIterator;
147 DbgIterator DbgBegin() { return DbgValues.begin(); }
148 DbgIterator DbgEnd() { return DbgValues.end(); }
149 DbgIterator ByvalParmDbgBegin() { return ByvalParmDbgValues.begin(); }
150 DbgIterator ByvalParmDbgEnd() { return ByvalParmDbgValues.end(); }
154 void checkForCycles(const SDNode *N);
155 void checkForCycles(const SelectionDAG *DAG);
157 /// SelectionDAG class - This is used to represent a portion of an LLVM function
158 /// in a low-level Data Dependence DAG representation suitable for instruction
159 /// selection. This DAG is constructed as the first step of instruction
160 /// selection in order to allow implementation of machine specific optimizations
161 /// and code simplifications.
163 /// The representation used by the SelectionDAG is a target-independent
164 /// representation, which has some similarities to the GCC RTL representation,
165 /// but is significantly more simple, powerful, and is a graph form instead of a
169 const TargetMachine &TM;
170 const TargetSelectionDAGInfo &TSI;
171 const TargetLowering *TLI;
173 LLVMContext *Context;
174 CodeGenOpt::Level OptLevel;
176 /// EntryNode - The starting token.
179 /// Root - The root of the entire DAG.
182 /// AllNodes - A linked list of nodes in the current DAG.
183 ilist<SDNode> AllNodes;
185 /// NodeAllocatorType - The AllocatorType for allocating SDNodes. We use
186 /// pool allocation with recycling.
187 typedef RecyclingAllocator<BumpPtrAllocator, SDNode, sizeof(LargestSDNode),
188 AlignOf<MostAlignedSDNode>::Alignment>
191 /// NodeAllocator - Pool allocation for nodes.
192 NodeAllocatorType NodeAllocator;
194 /// CSEMap - This structure is used to memoize nodes, automatically performing
195 /// CSE with existing nodes when a duplicate is requested.
196 FoldingSet<SDNode> CSEMap;
198 /// OperandAllocator - Pool allocation for machine-opcode SDNode operands.
199 BumpPtrAllocator OperandAllocator;
201 /// Allocator - Pool allocation for misc. objects that are created once per
203 BumpPtrAllocator Allocator;
205 /// DbgInfo - Tracks dbg_value information through SDISel.
209 /// DAGUpdateListener - Clients of various APIs that cause global effects on
210 /// the DAG can optionally implement this interface. This allows the clients
211 /// to handle the various sorts of updates that happen.
213 /// A DAGUpdateListener automatically registers itself with DAG when it is
214 /// constructed, and removes itself when destroyed in RAII fashion.
215 struct DAGUpdateListener {
216 DAGUpdateListener *const Next;
219 explicit DAGUpdateListener(SelectionDAG &D)
220 : Next(D.UpdateListeners), DAG(D) {
221 DAG.UpdateListeners = this;
224 virtual ~DAGUpdateListener() {
225 assert(DAG.UpdateListeners == this &&
226 "DAGUpdateListeners must be destroyed in LIFO order");
227 DAG.UpdateListeners = Next;
230 /// NodeDeleted - The node N that was deleted and, if E is not null, an
231 /// equivalent node E that replaced it.
232 virtual void NodeDeleted(SDNode *N, SDNode *E);
234 /// NodeUpdated - The node N that was updated.
235 virtual void NodeUpdated(SDNode *N);
238 /// NewNodesMustHaveLegalTypes - When true, additional steps are taken to
239 /// ensure that getConstant() and similar functions return DAG nodes that
240 /// have legal types. This is important after type legalization since
241 /// any illegally typed nodes generated after this point will not experience
242 /// type legalization.
243 bool NewNodesMustHaveLegalTypes;
246 /// DAGUpdateListener is a friend so it can manipulate the listener stack.
247 friend struct DAGUpdateListener;
249 /// UpdateListeners - Linked list of registered DAGUpdateListener instances.
250 /// This stack is maintained by DAGUpdateListener RAII.
251 DAGUpdateListener *UpdateListeners;
253 /// setGraphColorHelper - Implementation of setSubgraphColor.
254 /// Return whether we had to truncate the search.
256 bool setSubgraphColorHelper(SDNode *N, const char *Color,
257 DenseSet<SDNode *> &visited,
258 int level, bool &printed);
260 void operator=(const SelectionDAG&) LLVM_DELETED_FUNCTION;
261 SelectionDAG(const SelectionDAG&) LLVM_DELETED_FUNCTION;
264 explicit SelectionDAG(const TargetMachine &TM, llvm::CodeGenOpt::Level);
267 /// init - Prepare this SelectionDAG to process code in the given
270 void init(MachineFunction &mf, const TargetLowering *TLI);
272 /// clear - Clear state and free memory necessary to make this
273 /// SelectionDAG ready to process a new block.
277 MachineFunction &getMachineFunction() const { return *MF; }
278 const TargetMachine &getTarget() const { return TM; }
279 const TargetLowering &getTargetLoweringInfo() const { return *TLI; }
280 const TargetSelectionDAGInfo &getSelectionDAGInfo() const { return TSI; }
281 LLVMContext *getContext() const {return Context; }
283 /// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'.
285 void viewGraph(const std::string &Title);
289 std::map<const SDNode *, std::string> NodeGraphAttrs;
292 /// clearGraphAttrs - Clear all previously defined node graph attributes.
293 /// Intended to be used from a debugging tool (eg. gdb).
294 void clearGraphAttrs();
296 /// setGraphAttrs - Set graph attributes for a node. (eg. "color=red".)
298 void setGraphAttrs(const SDNode *N, const char *Attrs);
300 /// getGraphAttrs - Get graph attributes for a node. (eg. "color=red".)
301 /// Used from getNodeAttributes.
302 const std::string getGraphAttrs(const SDNode *N) const;
304 /// setGraphColor - Convenience for setting node color attribute.
306 void setGraphColor(const SDNode *N, const char *Color);
308 /// setGraphColor - Convenience for setting subgraph color attribute.
310 void setSubgraphColor(SDNode *N, const char *Color);
312 typedef ilist<SDNode>::const_iterator allnodes_const_iterator;
313 allnodes_const_iterator allnodes_begin() const { return AllNodes.begin(); }
314 allnodes_const_iterator allnodes_end() const { return AllNodes.end(); }
315 typedef ilist<SDNode>::iterator allnodes_iterator;
316 allnodes_iterator allnodes_begin() { return AllNodes.begin(); }
317 allnodes_iterator allnodes_end() { return AllNodes.end(); }
318 ilist<SDNode>::size_type allnodes_size() const {
319 return AllNodes.size();
322 /// getRoot - Return the root tag of the SelectionDAG.
324 const SDValue &getRoot() const { return Root; }
326 /// getEntryNode - Return the token chain corresponding to the entry of the
328 SDValue getEntryNode() const {
329 return SDValue(const_cast<SDNode *>(&EntryNode), 0);
332 /// setRoot - Set the current root tag of the SelectionDAG.
334 const SDValue &setRoot(SDValue N) {
335 assert((!N.getNode() || N.getValueType() == MVT::Other) &&
336 "DAG root value is not a chain!");
338 checkForCycles(N.getNode());
341 checkForCycles(this);
345 /// Combine - This iterates over the nodes in the SelectionDAG, folding
346 /// certain types of nodes together, or eliminating superfluous nodes. The
347 /// Level argument controls whether Combine is allowed to produce nodes and
348 /// types that are illegal on the target.
349 void Combine(CombineLevel Level, AliasAnalysis &AA,
350 CodeGenOpt::Level OptLevel);
352 /// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
353 /// only uses types natively supported by the target. Returns "true" if it
354 /// made any changes.
356 /// Note that this is an involved process that may invalidate pointers into
358 bool LegalizeTypes();
360 /// Legalize - This transforms the SelectionDAG into a SelectionDAG that is
361 /// compatible with the target instruction selector, as indicated by the
362 /// TargetLowering object.
364 /// Note that this is an involved process that may invalidate pointers into
368 /// LegalizeVectors - This transforms the SelectionDAG into a SelectionDAG
369 /// that only uses vector math operations supported by the target. This is
370 /// necessary as a separate step from Legalize because unrolling a vector
371 /// operation can introduce illegal types, which requires running
372 /// LegalizeTypes again.
374 /// This returns true if it made any changes; in that case, LegalizeTypes
375 /// is called again before Legalize.
377 /// Note that this is an involved process that may invalidate pointers into
379 bool LegalizeVectors();
381 /// RemoveDeadNodes - This method deletes all unreachable nodes in the
383 void RemoveDeadNodes();
385 /// DeleteNode - Remove the specified node from the system. This node must
386 /// have no referrers.
387 void DeleteNode(SDNode *N);
389 /// getVTList - Return an SDVTList that represents the list of values
391 SDVTList getVTList(EVT VT);
392 SDVTList getVTList(EVT VT1, EVT VT2);
393 SDVTList getVTList(EVT VT1, EVT VT2, EVT VT3);
394 SDVTList getVTList(EVT VT1, EVT VT2, EVT VT3, EVT VT4);
395 SDVTList getVTList(ArrayRef<EVT> VTs);
397 //===--------------------------------------------------------------------===//
398 // Node creation methods.
400 SDValue getConstant(uint64_t Val, EVT VT, bool isTarget = false,
401 bool isOpaque = false);
402 SDValue getConstant(const APInt &Val, EVT VT, bool isTarget = false,
403 bool isOpaque = false);
404 SDValue getConstant(const ConstantInt &Val, EVT VT, bool isTarget = false,
405 bool isOpaque = false);
406 SDValue getIntPtrConstant(uint64_t Val, bool isTarget = false);
407 SDValue getTargetConstant(uint64_t Val, EVT VT, bool isOpaque = false) {
408 return getConstant(Val, VT, true, isOpaque);
410 SDValue getTargetConstant(const APInt &Val, EVT VT, bool isOpaque = false) {
411 return getConstant(Val, VT, true, isOpaque);
413 SDValue getTargetConstant(const ConstantInt &Val, EVT VT,
414 bool isOpaque = false) {
415 return getConstant(Val, VT, true, isOpaque);
417 // The forms below that take a double should only be used for simple
418 // constants that can be exactly represented in VT. No checks are made.
419 SDValue getConstantFP(double Val, EVT VT, bool isTarget = false);
420 SDValue getConstantFP(const APFloat& Val, EVT VT, bool isTarget = false);
421 SDValue getConstantFP(const ConstantFP &CF, EVT VT, bool isTarget = false);
422 SDValue getTargetConstantFP(double Val, EVT VT) {
423 return getConstantFP(Val, VT, true);
425 SDValue getTargetConstantFP(const APFloat& Val, EVT VT) {
426 return getConstantFP(Val, VT, true);
428 SDValue getTargetConstantFP(const ConstantFP &Val, EVT VT) {
429 return getConstantFP(Val, VT, true);
431 SDValue getGlobalAddress(const GlobalValue *GV, SDLoc DL, EVT VT,
432 int64_t offset = 0, bool isTargetGA = false,
433 unsigned char TargetFlags = 0);
434 SDValue getTargetGlobalAddress(const GlobalValue *GV, SDLoc DL, EVT VT,
436 unsigned char TargetFlags = 0) {
437 return getGlobalAddress(GV, DL, VT, offset, true, TargetFlags);
439 SDValue getFrameIndex(int FI, EVT VT, bool isTarget = false);
440 SDValue getTargetFrameIndex(int FI, EVT VT) {
441 return getFrameIndex(FI, VT, true);
443 SDValue getJumpTable(int JTI, EVT VT, bool isTarget = false,
444 unsigned char TargetFlags = 0);
445 SDValue getTargetJumpTable(int JTI, EVT VT, unsigned char TargetFlags = 0) {
446 return getJumpTable(JTI, VT, true, TargetFlags);
448 SDValue getConstantPool(const Constant *C, EVT VT,
449 unsigned Align = 0, int Offs = 0, bool isT=false,
450 unsigned char TargetFlags = 0);
451 SDValue getTargetConstantPool(const Constant *C, EVT VT,
452 unsigned Align = 0, int Offset = 0,
453 unsigned char TargetFlags = 0) {
454 return getConstantPool(C, VT, Align, Offset, true, TargetFlags);
456 SDValue getConstantPool(MachineConstantPoolValue *C, EVT VT,
457 unsigned Align = 0, int Offs = 0, bool isT=false,
458 unsigned char TargetFlags = 0);
459 SDValue getTargetConstantPool(MachineConstantPoolValue *C,
460 EVT VT, unsigned Align = 0,
461 int Offset = 0, unsigned char TargetFlags=0) {
462 return getConstantPool(C, VT, Align, Offset, true, TargetFlags);
464 SDValue getTargetIndex(int Index, EVT VT, int64_t Offset = 0,
465 unsigned char TargetFlags = 0);
466 // When generating a branch to a BB, we don't in general know enough
467 // to provide debug info for the BB at that time, so keep this one around.
468 SDValue getBasicBlock(MachineBasicBlock *MBB);
469 SDValue getBasicBlock(MachineBasicBlock *MBB, SDLoc dl);
470 SDValue getExternalSymbol(const char *Sym, EVT VT);
471 SDValue getExternalSymbol(const char *Sym, SDLoc dl, EVT VT);
472 SDValue getTargetExternalSymbol(const char *Sym, EVT VT,
473 unsigned char TargetFlags = 0);
474 SDValue getValueType(EVT);
475 SDValue getRegister(unsigned Reg, EVT VT);
476 SDValue getRegisterMask(const uint32_t *RegMask);
477 SDValue getEHLabel(SDLoc dl, SDValue Root, MCSymbol *Label);
478 SDValue getBlockAddress(const BlockAddress *BA, EVT VT,
479 int64_t Offset = 0, bool isTarget = false,
480 unsigned char TargetFlags = 0);
481 SDValue getTargetBlockAddress(const BlockAddress *BA, EVT VT,
483 unsigned char TargetFlags = 0) {
484 return getBlockAddress(BA, VT, Offset, true, TargetFlags);
487 SDValue getCopyToReg(SDValue Chain, SDLoc dl, unsigned Reg, SDValue N) {
488 return getNode(ISD::CopyToReg, dl, MVT::Other, Chain,
489 getRegister(Reg, N.getValueType()), N);
492 // This version of the getCopyToReg method takes an extra operand, which
493 // indicates that there is potentially an incoming glue value (if Glue is not
494 // null) and that there should be a glue result.
495 SDValue getCopyToReg(SDValue Chain, SDLoc dl, unsigned Reg, SDValue N,
497 SDVTList VTs = getVTList(MVT::Other, MVT::Glue);
498 SDValue Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Glue };
499 return getNode(ISD::CopyToReg, dl, VTs,
500 ArrayRef<SDValue>(Ops, Glue.getNode() ? 4 : 3));
503 // Similar to last getCopyToReg() except parameter Reg is a SDValue
504 SDValue getCopyToReg(SDValue Chain, SDLoc dl, SDValue Reg, SDValue N,
506 SDVTList VTs = getVTList(MVT::Other, MVT::Glue);
507 SDValue Ops[] = { Chain, Reg, N, Glue };
508 return getNode(ISD::CopyToReg, dl, VTs,
509 ArrayRef<SDValue>(Ops, Glue.getNode() ? 4 : 3));
512 SDValue getCopyFromReg(SDValue Chain, SDLoc dl, unsigned Reg, EVT VT) {
513 SDVTList VTs = getVTList(VT, MVT::Other);
514 SDValue Ops[] = { Chain, getRegister(Reg, VT) };
515 return getNode(ISD::CopyFromReg, dl, VTs, Ops);
518 // This version of the getCopyFromReg method takes an extra operand, which
519 // indicates that there is potentially an incoming glue value (if Glue is not
520 // null) and that there should be a glue result.
521 SDValue getCopyFromReg(SDValue Chain, SDLoc dl, unsigned Reg, EVT VT,
523 SDVTList VTs = getVTList(VT, MVT::Other, MVT::Glue);
524 SDValue Ops[] = { Chain, getRegister(Reg, VT), Glue };
525 return getNode(ISD::CopyFromReg, dl, VTs,
526 ArrayRef<SDValue>(Ops, Glue.getNode() ? 3 : 2));
529 SDValue getCondCode(ISD::CondCode Cond);
531 /// Returns the ConvertRndSat Note: Avoid using this node because it may
532 /// disappear in the future and most targets don't support it.
533 SDValue getConvertRndSat(EVT VT, SDLoc dl, SDValue Val, SDValue DTy,
535 SDValue Rnd, SDValue Sat, ISD::CvtCode Code);
537 /// getVectorShuffle - Return an ISD::VECTOR_SHUFFLE node. The number of
538 /// elements in VT, which must be a vector type, must match the number of
539 /// mask elements NumElts. A integer mask element equal to -1 is treated as
541 SDValue getVectorShuffle(EVT VT, SDLoc dl, SDValue N1, SDValue N2,
542 const int *MaskElts);
544 /// getAnyExtOrTrunc - Convert Op, which must be of integer type, to the
545 /// integer type VT, by either any-extending or truncating it.
546 SDValue getAnyExtOrTrunc(SDValue Op, SDLoc DL, EVT VT);
548 /// getSExtOrTrunc - Convert Op, which must be of integer type, to the
549 /// integer type VT, by either sign-extending or truncating it.
550 SDValue getSExtOrTrunc(SDValue Op, SDLoc DL, EVT VT);
552 /// getZExtOrTrunc - Convert Op, which must be of integer type, to the
553 /// integer type VT, by either zero-extending or truncating it.
554 SDValue getZExtOrTrunc(SDValue Op, SDLoc DL, EVT VT);
556 /// getZeroExtendInReg - Return the expression required to zero extend the Op
557 /// value assuming it was the smaller SrcTy value.
558 SDValue getZeroExtendInReg(SDValue Op, SDLoc DL, EVT SrcTy);
560 /// getNOT - Create a bitwise NOT operation as (XOR Val, -1).
561 SDValue getNOT(SDLoc DL, SDValue Val, EVT VT);
563 /// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
564 /// a glue result (to ensure it's not CSE'd). CALLSEQ_START does not have a
566 SDValue getCALLSEQ_START(SDValue Chain, SDValue Op, SDLoc DL) {
567 SDVTList VTs = getVTList(MVT::Other, MVT::Glue);
568 SDValue Ops[] = { Chain, Op };
569 return getNode(ISD::CALLSEQ_START, DL, VTs, Ops);
572 /// getCALLSEQ_END - Return a new CALLSEQ_END node, which always must have a
573 /// glue result (to ensure it's not CSE'd). CALLSEQ_END does not have
575 SDValue getCALLSEQ_END(SDValue Chain, SDValue Op1, SDValue Op2,
576 SDValue InGlue, SDLoc DL) {
577 SDVTList NodeTys = getVTList(MVT::Other, MVT::Glue);
578 SmallVector<SDValue, 4> Ops;
579 Ops.push_back(Chain);
582 if (InGlue.getNode())
583 Ops.push_back(InGlue);
584 return getNode(ISD::CALLSEQ_END, DL, NodeTys, Ops);
587 /// getUNDEF - Return an UNDEF node. UNDEF does not have a useful SDLoc.
588 SDValue getUNDEF(EVT VT) {
589 return getNode(ISD::UNDEF, SDLoc(), VT);
592 /// getGLOBAL_OFFSET_TABLE - Return a GLOBAL_OFFSET_TABLE node. This does
593 /// not have a useful SDLoc.
594 SDValue getGLOBAL_OFFSET_TABLE(EVT VT) {
595 return getNode(ISD::GLOBAL_OFFSET_TABLE, SDLoc(), VT);
598 /// getNode - Gets or creates the specified node.
600 SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT);
601 SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N);
602 SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1, SDValue N2);
603 SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT,
604 SDValue N1, SDValue N2, SDValue N3);
605 SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT,
606 SDValue N1, SDValue N2, SDValue N3, SDValue N4);
607 SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT,
608 SDValue N1, SDValue N2, SDValue N3, SDValue N4,
610 SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, ArrayRef<SDUse> Ops);
611 SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT,
612 ArrayRef<SDValue> Ops);
613 SDValue getNode(unsigned Opcode, SDLoc DL,
614 ArrayRef<EVT> ResultTys,
615 ArrayRef<SDValue> Ops);
616 SDValue getNode(unsigned Opcode, SDLoc DL, SDVTList VTs,
617 ArrayRef<SDValue> Ops);
618 SDValue getNode(unsigned Opcode, SDLoc DL, SDVTList VTs);
619 SDValue getNode(unsigned Opcode, SDLoc DL, SDVTList VTs, SDValue N);
620 SDValue getNode(unsigned Opcode, SDLoc DL, SDVTList VTs,
621 SDValue N1, SDValue N2);
622 SDValue getNode(unsigned Opcode, SDLoc DL, SDVTList VTs,
623 SDValue N1, SDValue N2, SDValue N3);
624 SDValue getNode(unsigned Opcode, SDLoc DL, SDVTList VTs,
625 SDValue N1, SDValue N2, SDValue N3, SDValue N4);
626 SDValue getNode(unsigned Opcode, SDLoc DL, SDVTList VTs,
627 SDValue N1, SDValue N2, SDValue N3, SDValue N4,
630 /// getStackArgumentTokenFactor - Compute a TokenFactor to force all
631 /// the incoming stack arguments to be loaded from the stack. This is
632 /// used in tail call lowering to protect stack arguments from being
634 SDValue getStackArgumentTokenFactor(SDValue Chain);
636 SDValue getMemcpy(SDValue Chain, SDLoc dl, SDValue Dst, SDValue Src,
637 SDValue Size, unsigned Align, bool isVol, bool AlwaysInline,
638 MachinePointerInfo DstPtrInfo,
639 MachinePointerInfo SrcPtrInfo);
641 SDValue getMemmove(SDValue Chain, SDLoc dl, SDValue Dst, SDValue Src,
642 SDValue Size, unsigned Align, bool isVol,
643 MachinePointerInfo DstPtrInfo,
644 MachinePointerInfo SrcPtrInfo);
646 SDValue getMemset(SDValue Chain, SDLoc dl, SDValue Dst, SDValue Src,
647 SDValue Size, unsigned Align, bool isVol,
648 MachinePointerInfo DstPtrInfo);
650 /// getSetCC - Helper function to make it easier to build SetCC's if you just
651 /// have an ISD::CondCode instead of an SDValue.
653 SDValue getSetCC(SDLoc DL, EVT VT, SDValue LHS, SDValue RHS,
654 ISD::CondCode Cond) {
655 assert(LHS.getValueType().isVector() == RHS.getValueType().isVector() &&
656 "Cannot compare scalars to vectors");
657 assert(LHS.getValueType().isVector() == VT.isVector() &&
658 "Cannot compare scalars to vectors");
659 assert(Cond != ISD::SETCC_INVALID &&
660 "Cannot create a setCC of an invalid node.");
661 return getNode(ISD::SETCC, DL, VT, LHS, RHS, getCondCode(Cond));
664 // getSelect - Helper function to make it easier to build Select's if you just
665 // have operands and don't want to check for vector.
666 SDValue getSelect(SDLoc DL, EVT VT, SDValue Cond,
667 SDValue LHS, SDValue RHS) {
668 assert(LHS.getValueType() == RHS.getValueType() &&
669 "Cannot use select on differing types");
670 assert(VT.isVector() == LHS.getValueType().isVector() &&
671 "Cannot mix vectors and scalars");
672 return getNode(Cond.getValueType().isVector() ? ISD::VSELECT : ISD::SELECT, DL, VT,
676 /// getSelectCC - Helper function to make it easier to build SelectCC's if you
677 /// just have an ISD::CondCode instead of an SDValue.
679 SDValue getSelectCC(SDLoc DL, SDValue LHS, SDValue RHS,
680 SDValue True, SDValue False, ISD::CondCode Cond) {
681 return getNode(ISD::SELECT_CC, DL, True.getValueType(),
682 LHS, RHS, True, False, getCondCode(Cond));
685 /// getVAArg - VAArg produces a result and token chain, and takes a pointer
686 /// and a source value as input.
687 SDValue getVAArg(EVT VT, SDLoc dl, SDValue Chain, SDValue Ptr,
688 SDValue SV, unsigned Align);
690 /// getAtomic - Gets a node for an atomic op, produces result and chain and
692 SDValue getAtomic(unsigned Opcode, SDLoc dl, EVT MemVT, SDValue Chain,
693 SDValue Ptr, SDValue Cmp, SDValue Swp,
694 MachinePointerInfo PtrInfo, unsigned Alignment,
695 AtomicOrdering SuccessOrdering,
696 AtomicOrdering FailureOrdering,
697 SynchronizationScope SynchScope);
698 SDValue getAtomic(unsigned Opcode, SDLoc dl, EVT MemVT, SDValue Chain,
699 SDValue Ptr, SDValue Cmp, SDValue Swp,
700 MachineMemOperand *MMO,
701 AtomicOrdering SuccessOrdering,
702 AtomicOrdering FailureOrdering,
703 SynchronizationScope SynchScope);
705 /// getAtomic - Gets a node for an atomic op, produces result (if relevant)
706 /// and chain and takes 2 operands.
707 SDValue getAtomic(unsigned Opcode, SDLoc dl, EVT MemVT, SDValue Chain,
708 SDValue Ptr, SDValue Val, const Value *PtrVal,
709 unsigned Alignment, AtomicOrdering Ordering,
710 SynchronizationScope SynchScope);
711 SDValue getAtomic(unsigned Opcode, SDLoc dl, EVT MemVT, SDValue Chain,
712 SDValue Ptr, SDValue Val, MachineMemOperand *MMO,
713 AtomicOrdering Ordering,
714 SynchronizationScope SynchScope);
716 /// getAtomic - Gets a node for an atomic op, produces result and chain and
718 SDValue getAtomic(unsigned Opcode, SDLoc dl, EVT MemVT, EVT VT,
719 SDValue Chain, SDValue Ptr, MachineMemOperand *MMO,
720 AtomicOrdering Ordering,
721 SynchronizationScope SynchScope);
723 /// getAtomic - Gets a node for an atomic op, produces result and chain and
724 /// takes N operands.
725 SDValue getAtomic(unsigned Opcode, SDLoc dl, EVT MemVT, SDVTList VTList,
726 const SDValue *Ops, unsigned NumOps, MachineMemOperand *MMO,
727 AtomicOrdering SuccessOrdering,
728 AtomicOrdering FailureOrdering,
729 SynchronizationScope SynchScope);
730 SDValue getAtomic(unsigned Opcode, SDLoc dl, EVT MemVT, SDVTList VTList,
731 const SDValue *Ops, unsigned NumOps, MachineMemOperand *MMO,
732 AtomicOrdering Ordering, SynchronizationScope SynchScope);
734 /// getMemIntrinsicNode - Creates a MemIntrinsicNode that may produce a
735 /// result and takes a list of operands. Opcode may be INTRINSIC_VOID,
736 /// INTRINSIC_W_CHAIN, or a target-specific opcode with a value not
737 /// less than FIRST_TARGET_MEMORY_OPCODE.
738 SDValue getMemIntrinsicNode(unsigned Opcode, SDLoc dl, SDVTList VTList,
739 ArrayRef<SDValue> Ops,
740 EVT MemVT, MachinePointerInfo PtrInfo,
741 unsigned Align = 0, bool Vol = false,
742 bool ReadMem = true, bool WriteMem = true);
744 SDValue getMemIntrinsicNode(unsigned Opcode, SDLoc dl, SDVTList VTList,
745 ArrayRef<SDValue> Ops,
746 EVT MemVT, MachineMemOperand *MMO);
748 /// getMergeValues - Create a MERGE_VALUES node from the given operands.
749 SDValue getMergeValues(ArrayRef<SDValue> Ops, SDLoc dl);
751 /// getLoad - Loads are not normal binary operators: their result type is not
752 /// determined by their operands, and they produce a value AND a token chain.
754 SDValue getLoad(EVT VT, SDLoc dl, SDValue Chain, SDValue Ptr,
755 MachinePointerInfo PtrInfo, bool isVolatile,
756 bool isNonTemporal, bool isInvariant, unsigned Alignment,
757 const MDNode *TBAAInfo = nullptr,
758 const MDNode *Ranges = nullptr);
759 SDValue getLoad(EVT VT, SDLoc dl, SDValue Chain, SDValue Ptr,
760 MachineMemOperand *MMO);
761 SDValue getExtLoad(ISD::LoadExtType ExtType, SDLoc dl, EVT VT,
762 SDValue Chain, SDValue Ptr, MachinePointerInfo PtrInfo,
763 EVT MemVT, bool isVolatile,
764 bool isNonTemporal, unsigned Alignment,
765 const MDNode *TBAAInfo = nullptr);
766 SDValue getExtLoad(ISD::LoadExtType ExtType, SDLoc dl, EVT VT,
767 SDValue Chain, SDValue Ptr, EVT MemVT,
768 MachineMemOperand *MMO);
769 SDValue getIndexedLoad(SDValue OrigLoad, SDLoc dl, SDValue Base,
770 SDValue Offset, ISD::MemIndexedMode AM);
771 SDValue getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
773 SDValue Chain, SDValue Ptr, SDValue Offset,
774 MachinePointerInfo PtrInfo, EVT MemVT,
775 bool isVolatile, bool isNonTemporal, bool isInvariant,
776 unsigned Alignment, const MDNode *TBAAInfo = nullptr,
777 const MDNode *Ranges = nullptr);
778 SDValue getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
780 SDValue Chain, SDValue Ptr, SDValue Offset,
781 EVT MemVT, MachineMemOperand *MMO);
783 /// getStore - Helper function to build ISD::STORE nodes.
785 SDValue getStore(SDValue Chain, SDLoc dl, SDValue Val, SDValue Ptr,
786 MachinePointerInfo PtrInfo, bool isVolatile,
787 bool isNonTemporal, unsigned Alignment,
788 const MDNode *TBAAInfo = nullptr);
789 SDValue getStore(SDValue Chain, SDLoc dl, SDValue Val, SDValue Ptr,
790 MachineMemOperand *MMO);
791 SDValue getTruncStore(SDValue Chain, SDLoc dl, SDValue Val, SDValue Ptr,
792 MachinePointerInfo PtrInfo, EVT TVT,
793 bool isNonTemporal, bool isVolatile,
795 const MDNode *TBAAInfo = nullptr);
796 SDValue getTruncStore(SDValue Chain, SDLoc dl, SDValue Val, SDValue Ptr,
797 EVT TVT, MachineMemOperand *MMO);
798 SDValue getIndexedStore(SDValue OrigStoe, SDLoc dl, SDValue Base,
799 SDValue Offset, ISD::MemIndexedMode AM);
801 /// getSrcValue - Construct a node to track a Value* through the backend.
802 SDValue getSrcValue(const Value *v);
804 /// getMDNode - Return an MDNodeSDNode which holds an MDNode.
805 SDValue getMDNode(const MDNode *MD);
807 /// getAddrSpaceCast - Return an AddrSpaceCastSDNode.
808 SDValue getAddrSpaceCast(SDLoc dl, EVT VT, SDValue Ptr,
809 unsigned SrcAS, unsigned DestAS);
811 /// getShiftAmountOperand - Return the specified value casted to
812 /// the target's desired shift amount type.
813 SDValue getShiftAmountOperand(EVT LHSTy, SDValue Op);
815 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
816 /// specified operands. If the resultant node already exists in the DAG,
817 /// this does not modify the specified node, instead it returns the node that
818 /// already exists. If the resultant node does not exist in the DAG, the
819 /// input node is returned. As a degenerate case, if you specify the same
820 /// input operands as the node already has, the input node is returned.
821 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op);
822 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2);
823 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
825 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
826 SDValue Op3, SDValue Op4);
827 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
828 SDValue Op3, SDValue Op4, SDValue Op5);
829 SDNode *UpdateNodeOperands(SDNode *N,
830 const SDValue *Ops, unsigned NumOps);
832 /// SelectNodeTo - These are used for target selectors to *mutate* the
833 /// specified node to have the specified return type, Target opcode, and
834 /// operands. Note that target opcodes are stored as
835 /// ~TargetOpcode in the node opcode field. The resultant node is returned.
836 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT);
837 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT, SDValue Op1);
838 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT,
839 SDValue Op1, SDValue Op2);
840 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT,
841 SDValue Op1, SDValue Op2, SDValue Op3);
842 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT,
843 ArrayRef<SDValue> Ops);
844 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1, EVT VT2);
845 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
846 EVT VT2, ArrayRef<SDValue> Ops);
847 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
848 EVT VT2, EVT VT3, ArrayRef<SDValue> Ops);
849 SDNode *SelectNodeTo(SDNode *N, unsigned MachineOpc, EVT VT1,
850 EVT VT2, EVT VT3, EVT VT4, ArrayRef<SDValue> Ops);
851 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
852 EVT VT2, SDValue Op1);
853 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
854 EVT VT2, SDValue Op1, SDValue Op2);
855 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
856 EVT VT2, SDValue Op1, SDValue Op2, SDValue Op3);
857 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
858 EVT VT2, EVT VT3, SDValue Op1, SDValue Op2, SDValue Op3);
859 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, SDVTList VTs,
860 ArrayRef<SDValue> Ops);
862 /// MorphNodeTo - This *mutates* the specified node to have the specified
863 /// return type, opcode, and operands.
864 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, SDVTList VTs,
865 ArrayRef<SDValue> Ops);
867 /// getMachineNode - These are used for target selectors to create a new node
868 /// with specified return type(s), MachineInstr opcode, and operands.
870 /// Note that getMachineNode returns the resultant node. If there is already
871 /// a node of the specified opcode and operands, it returns that node instead
872 /// of the current one.
873 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT);
874 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT,
876 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT,
877 SDValue Op1, SDValue Op2);
878 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT,
879 SDValue Op1, SDValue Op2, SDValue Op3);
880 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT,
881 ArrayRef<SDValue> Ops);
882 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT1, EVT VT2);
883 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT1, EVT VT2,
885 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT1, EVT VT2,
886 SDValue Op1, SDValue Op2);
887 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT1, EVT VT2,
888 SDValue Op1, SDValue Op2, SDValue Op3);
889 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT1, EVT VT2,
890 ArrayRef<SDValue> Ops);
891 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT1, EVT VT2,
892 EVT VT3, SDValue Op1, SDValue Op2);
893 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT1, EVT VT2,
894 EVT VT3, SDValue Op1, SDValue Op2,
896 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT1, EVT VT2,
897 EVT VT3, ArrayRef<SDValue> Ops);
898 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, EVT VT1, EVT VT2,
899 EVT VT3, EVT VT4, ArrayRef<SDValue> Ops);
900 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl,
901 ArrayRef<EVT> ResultTys,
902 ArrayRef<SDValue> Ops);
903 MachineSDNode *getMachineNode(unsigned Opcode, SDLoc dl, SDVTList VTs,
904 ArrayRef<SDValue> Ops);
906 /// getTargetExtractSubreg - A convenience function for creating
907 /// TargetInstrInfo::EXTRACT_SUBREG nodes.
908 SDValue getTargetExtractSubreg(int SRIdx, SDLoc DL, EVT VT,
911 /// getTargetInsertSubreg - A convenience function for creating
912 /// TargetInstrInfo::INSERT_SUBREG nodes.
913 SDValue getTargetInsertSubreg(int SRIdx, SDLoc DL, EVT VT,
914 SDValue Operand, SDValue Subreg);
916 /// getNodeIfExists - Get the specified node if it's already available, or
917 /// else return NULL.
918 SDNode *getNodeIfExists(unsigned Opcode, SDVTList VTs, ArrayRef<SDValue> Ops);
920 /// getDbgValue - Creates a SDDbgValue node.
922 SDDbgValue *getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R,
923 bool IsIndirect, uint64_t Off,
924 DebugLoc DL, unsigned O);
926 SDDbgValue *getConstantDbgValue(MDNode *MDPtr, const Value *C, uint64_t Off,
927 DebugLoc DL, unsigned O);
929 SDDbgValue *getFrameIndexDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off,
930 DebugLoc DL, unsigned O);
932 /// RemoveDeadNode - Remove the specified node from the system. If any of its
933 /// operands then becomes dead, remove them as well. Inform UpdateListener
934 /// for each node deleted.
935 void RemoveDeadNode(SDNode *N);
937 /// RemoveDeadNodes - This method deletes the unreachable nodes in the
938 /// given list, and any nodes that become unreachable as a result.
939 void RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes);
941 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
942 /// This can cause recursive merging of nodes in the DAG. Use the first
943 /// version if 'From' is known to have a single result, use the second
944 /// if you have two nodes with identical results (or if 'To' has a superset
945 /// of the results of 'From'), use the third otherwise.
947 /// These methods all take an optional UpdateListener, which (if not null) is
948 /// informed about nodes that are deleted and modified due to recursive
949 /// changes in the dag.
951 /// These functions only replace all existing uses. It's possible that as
952 /// these replacements are being performed, CSE may cause the From node
953 /// to be given new uses. These new uses of From are left in place, and
954 /// not automatically transferred to To.
956 void ReplaceAllUsesWith(SDValue From, SDValue Op);
957 void ReplaceAllUsesWith(SDNode *From, SDNode *To);
958 void ReplaceAllUsesWith(SDNode *From, const SDValue *To);
960 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
961 /// uses of other values produced by From.Val alone.
962 void ReplaceAllUsesOfValueWith(SDValue From, SDValue To);
964 /// ReplaceAllUsesOfValuesWith - Like ReplaceAllUsesOfValueWith, but
965 /// for multiple values at once. This correctly handles the case where
966 /// there is an overlap between the From values and the To values.
967 void ReplaceAllUsesOfValuesWith(const SDValue *From, const SDValue *To,
970 /// AssignTopologicalOrder - Topological-sort the AllNodes list and a
971 /// assign a unique node id for each node in the DAG based on their
972 /// topological order. Returns the number of nodes.
973 unsigned AssignTopologicalOrder();
975 /// RepositionNode - Move node N in the AllNodes list to be immediately
976 /// before the given iterator Position. This may be used to update the
977 /// topological ordering when the list of nodes is modified.
978 void RepositionNode(allnodes_iterator Position, SDNode *N) {
979 AllNodes.insert(Position, AllNodes.remove(N));
982 /// isCommutativeBinOp - Returns true if the opcode is a commutative binary
984 static bool isCommutativeBinOp(unsigned Opcode) {
985 // FIXME: This should get its info from the td file, so that we can include
1002 case ISD::ADDE: return true;
1003 default: return false;
1007 /// Returns an APFloat semantics tag appropriate for the given type. If VT is
1008 /// a vector type, the element semantics are returned.
1009 static const fltSemantics &EVTToAPFloatSemantics(EVT VT) {
1010 switch (VT.getScalarType().getSimpleVT().SimpleTy) {
1011 default: llvm_unreachable("Unknown FP format");
1012 case MVT::f16: return APFloat::IEEEhalf;
1013 case MVT::f32: return APFloat::IEEEsingle;
1014 case MVT::f64: return APFloat::IEEEdouble;
1015 case MVT::f80: return APFloat::x87DoubleExtended;
1016 case MVT::f128: return APFloat::IEEEquad;
1017 case MVT::ppcf128: return APFloat::PPCDoubleDouble;
1021 /// AddDbgValue - Add a dbg_value SDNode. If SD is non-null that means the
1022 /// value is produced by SD.
1023 void AddDbgValue(SDDbgValue *DB, SDNode *SD, bool isParameter);
1025 /// GetDbgValues - Get the debug values which reference the given SDNode.
1026 ArrayRef<SDDbgValue*> GetDbgValues(const SDNode* SD) {
1027 return DbgInfo->getSDDbgValues(SD);
1030 /// TransferDbgValues - Transfer SDDbgValues.
1031 void TransferDbgValues(SDValue From, SDValue To);
1033 /// hasDebugValues - Return true if there are any SDDbgValue nodes associated
1034 /// with this SelectionDAG.
1035 bool hasDebugValues() const { return !DbgInfo->empty(); }
1037 SDDbgInfo::DbgIterator DbgBegin() { return DbgInfo->DbgBegin(); }
1038 SDDbgInfo::DbgIterator DbgEnd() { return DbgInfo->DbgEnd(); }
1039 SDDbgInfo::DbgIterator ByvalParmDbgBegin() {
1040 return DbgInfo->ByvalParmDbgBegin();
1042 SDDbgInfo::DbgIterator ByvalParmDbgEnd() {
1043 return DbgInfo->ByvalParmDbgEnd();
1048 /// CreateStackTemporary - Create a stack temporary, suitable for holding the
1049 /// specified value type. If minAlign is specified, the slot size will have
1050 /// at least that alignment.
1051 SDValue CreateStackTemporary(EVT VT, unsigned minAlign = 1);
1053 /// CreateStackTemporary - Create a stack temporary suitable for holding
1054 /// either of the specified value types.
1055 SDValue CreateStackTemporary(EVT VT1, EVT VT2);
1057 /// FoldConstantArithmetic -
1058 SDValue FoldConstantArithmetic(unsigned Opcode, EVT VT,
1059 SDNode *Cst1, SDNode *Cst2);
1061 /// FoldSetCC - Constant fold a setcc to true or false.
1062 SDValue FoldSetCC(EVT VT, SDValue N1,
1063 SDValue N2, ISD::CondCode Cond, SDLoc dl);
1065 /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
1066 /// use this predicate to simplify operations downstream.
1067 bool SignBitIsZero(SDValue Op, unsigned Depth = 0) const;
1069 /// MaskedValueIsZero - Return true if 'Op & Mask' is known to be zero. We
1070 /// use this predicate to simplify operations downstream. Op and Mask are
1071 /// known to be the same type.
1072 bool MaskedValueIsZero(SDValue Op, const APInt &Mask, unsigned Depth = 0)
1075 /// ComputeMaskedBits - Determine which of the bits specified in Mask are
1076 /// known to be either zero or one and return them in the KnownZero/KnownOne
1077 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit
1078 /// processing. Targets can implement the computeMaskedBitsForTargetNode
1079 /// method in the TargetLowering class to allow target nodes to be understood.
1080 void ComputeMaskedBits(SDValue Op, APInt &KnownZero, APInt &KnownOne,
1081 unsigned Depth = 0) const;
1083 /// ComputeNumSignBits - Return the number of times the sign bit of the
1084 /// register is replicated into the other bits. We know that at least 1 bit
1085 /// is always equal to the sign bit (itself), but other cases can give us
1086 /// information. For example, immediately after an "SRA X, 2", we know that
1087 /// the top 3 bits are all equal to each other, so we return 3. Targets can
1088 /// implement the ComputeNumSignBitsForTarget method in the TargetLowering
1089 /// class to allow target nodes to be understood.
1090 unsigned ComputeNumSignBits(SDValue Op, unsigned Depth = 0) const;
1092 /// isBaseWithConstantOffset - Return true if the specified operand is an
1093 /// ISD::ADD with a ConstantSDNode on the right-hand side, or if it is an
1094 /// ISD::OR with a ConstantSDNode that is guaranteed to have the same
1095 /// semantics as an ADD. This handles the equivalence:
1096 /// X|Cst == X+Cst iff X&Cst = 0.
1097 bool isBaseWithConstantOffset(SDValue Op) const;
1099 /// isKnownNeverNan - Test whether the given SDValue is known to never be NaN.
1100 bool isKnownNeverNaN(SDValue Op) const;
1102 /// isKnownNeverZero - Test whether the given SDValue is known to never be
1103 /// positive or negative Zero.
1104 bool isKnownNeverZero(SDValue Op) const;
1106 /// isEqualTo - Test whether two SDValues are known to compare equal. This
1107 /// is true if they are the same value, or if one is negative zero and the
1108 /// other positive zero.
1109 bool isEqualTo(SDValue A, SDValue B) const;
1111 /// UnrollVectorOp - Utility function used by legalize and lowering to
1112 /// "unroll" a vector operation by splitting out the scalars and operating
1113 /// on each element individually. If the ResNE is 0, fully unroll the vector
1114 /// op. If ResNE is less than the width of the vector op, unroll up to ResNE.
1115 /// If the ResNE is greater than the width of the vector op, unroll the
1116 /// vector op and fill the end of the resulting vector with UNDEFS.
1117 SDValue UnrollVectorOp(SDNode *N, unsigned ResNE = 0);
1119 /// isConsecutiveLoad - Return true if LD is loading 'Bytes' bytes from a
1120 /// location that is 'Dist' units away from the location that the 'Base' load
1121 /// is loading from.
1122 bool isConsecutiveLoad(LoadSDNode *LD, LoadSDNode *Base,
1123 unsigned Bytes, int Dist) const;
1125 /// InferPtrAlignment - Infer alignment of a load / store address. Return 0 if
1126 /// it cannot be inferred.
1127 unsigned InferPtrAlignment(SDValue Ptr) const;
1129 /// GetSplitDestVTs - Compute the VTs needed for the low/hi parts of a type
1130 /// which is split (or expanded) into two not necessarily identical pieces.
1131 std::pair<EVT, EVT> GetSplitDestVTs(const EVT &VT) const;
1133 /// SplitVector - Split the vector with EXTRACT_SUBVECTOR using the provides
1134 /// VTs and return the low/high part.
1135 std::pair<SDValue, SDValue> SplitVector(const SDValue &N, const SDLoc &DL,
1136 const EVT &LoVT, const EVT &HiVT);
1138 /// SplitVector - Split the vector with EXTRACT_SUBVECTOR and return the
1140 std::pair<SDValue, SDValue> SplitVector(const SDValue &N, const SDLoc &DL) {
1142 std::tie(LoVT, HiVT) = GetSplitDestVTs(N.getValueType());
1143 return SplitVector(N, DL, LoVT, HiVT);
1146 /// SplitVectorOperand - Split the node's operand with EXTRACT_SUBVECTOR and
1147 /// return the low/high part.
1148 std::pair<SDValue, SDValue> SplitVectorOperand(const SDNode *N, unsigned OpNo)
1150 return SplitVector(N->getOperand(OpNo), SDLoc(N));
1153 /// ExtractVectorElements - Append the extracted elements from Start to Count
1154 /// out of the vector Op in Args. If Count is 0, all of the elements will be
1156 void ExtractVectorElements(SDValue Op, SmallVectorImpl<SDValue> &Args,
1157 unsigned Start = 0, unsigned Count = 0);
1159 unsigned getEVTAlignment(EVT MemoryVT) const;
1162 bool RemoveNodeFromCSEMaps(SDNode *N);
1163 void AddModifiedNodeToCSEMaps(SDNode *N);
1164 SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op, void *&InsertPos);
1165 SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op1, SDValue Op2,
1167 SDNode *FindModifiedNodeSlot(SDNode *N, const SDValue *Ops, unsigned NumOps,
1169 SDNode *UpdadeSDLocOnMergedSDNode(SDNode *N, SDLoc loc);
1171 void DeleteNodeNotInCSEMaps(SDNode *N);
1172 void DeallocateNode(SDNode *N);
1174 void allnodes_clear();
1176 /// VTList - List of non-single value types.
1177 FoldingSet<SDVTListNode> VTListMap;
1179 /// CondCodeNodes - Maps to auto-CSE operations.
1180 std::vector<CondCodeSDNode*> CondCodeNodes;
1182 std::vector<SDNode*> ValueTypeNodes;
1183 std::map<EVT, SDNode*, EVT::compareRawBits> ExtendedValueTypeNodes;
1184 StringMap<SDNode*> ExternalSymbols;
1186 std::map<std::pair<std::string, unsigned char>,SDNode*> TargetExternalSymbols;
1189 template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
1190 typedef SelectionDAG::allnodes_iterator nodes_iterator;
1191 static nodes_iterator nodes_begin(SelectionDAG *G) {
1192 return G->allnodes_begin();
1194 static nodes_iterator nodes_end(SelectionDAG *G) {
1195 return G->allnodes_end();
1199 } // end namespace llvm