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;
39 class TargetSelectionDAGInfo;
40 class TargetTransformInfo;
42 template<> struct ilist_traits<SDNode> : public ilist_default_traits<SDNode> {
44 mutable ilist_half_node<SDNode> Sentinel;
46 SDNode *createSentinel() const {
47 return static_cast<SDNode*>(&Sentinel);
49 static void destroySentinel(SDNode *) {}
51 SDNode *provideInitialHead() const { return createSentinel(); }
52 SDNode *ensureHead(SDNode*) const { return createSentinel(); }
53 static void noteHead(SDNode*, SDNode*) {}
55 static void deleteNode(SDNode *) {
56 llvm_unreachable("ilist_traits<SDNode> shouldn't see a deleteNode call!");
59 static void createNode(const SDNode &);
62 /// SDDbgInfo - Keeps track of dbg_value information through SDISel. We do
63 /// not build SDNodes for these so as not to perturb the generated code;
64 /// instead the info is kept off to the side in this structure. Each SDNode may
65 /// have one or more associated dbg_value entries. This information is kept in
67 /// Byval parameters are handled separately because they don't use alloca's,
68 /// which busts the normal mechanism. There is good reason for handling all
69 /// parameters separately: they may not have code generated for them, they
70 /// should always go at the beginning of the function regardless of other code
71 /// motion, and debug info for them is potentially useful even if the parameter
72 /// is unused. Right now only byval parameters are handled separately.
74 SmallVector<SDDbgValue*, 32> DbgValues;
75 SmallVector<SDDbgValue*, 32> ByvalParmDbgValues;
76 DenseMap<const SDNode*, SmallVector<SDDbgValue*, 2> > DbgValMap;
78 void operator=(const SDDbgInfo&) LLVM_DELETED_FUNCTION;
79 SDDbgInfo(const SDDbgInfo&) LLVM_DELETED_FUNCTION;
83 void add(SDDbgValue *V, const SDNode *Node, bool isParameter) {
85 ByvalParmDbgValues.push_back(V);
86 } else DbgValues.push_back(V);
88 DbgValMap[Node].push_back(V);
94 ByvalParmDbgValues.clear();
98 return DbgValues.empty() && ByvalParmDbgValues.empty();
101 ArrayRef<SDDbgValue*> getSDDbgValues(const SDNode *Node) {
102 DenseMap<const SDNode*, SmallVector<SDDbgValue*, 2> >::iterator I =
103 DbgValMap.find(Node);
104 if (I != DbgValMap.end())
106 return ArrayRef<SDDbgValue*>();
109 typedef SmallVector<SDDbgValue*,32>::iterator DbgIterator;
110 DbgIterator DbgBegin() { return DbgValues.begin(); }
111 DbgIterator DbgEnd() { return DbgValues.end(); }
112 DbgIterator ByvalParmDbgBegin() { return ByvalParmDbgValues.begin(); }
113 DbgIterator ByvalParmDbgEnd() { return ByvalParmDbgValues.end(); }
117 void checkForCycles(const SDNode *N);
118 void checkForCycles(const SelectionDAG *DAG);
120 /// SelectionDAG class - This is used to represent a portion of an LLVM function
121 /// in a low-level Data Dependence DAG representation suitable for instruction
122 /// selection. This DAG is constructed as the first step of instruction
123 /// selection in order to allow implementation of machine specific optimizations
124 /// and code simplifications.
126 /// The representation used by the SelectionDAG is a target-independent
127 /// representation, which has some similarities to the GCC RTL representation,
128 /// but is significantly more simple, powerful, and is a graph form instead of a
132 const TargetMachine &TM;
133 const TargetLowering &TLI;
134 const TargetSelectionDAGInfo &TSI;
135 const TargetTransformInfo *TTI;
137 LLVMContext *Context;
138 CodeGenOpt::Level OptLevel;
140 /// EntryNode - The starting token.
143 /// Root - The root of the entire DAG.
146 /// AllNodes - A linked list of nodes in the current DAG.
147 ilist<SDNode> AllNodes;
149 /// NodeAllocatorType - The AllocatorType for allocating SDNodes. We use
150 /// pool allocation with recycling.
151 typedef RecyclingAllocator<BumpPtrAllocator, SDNode, sizeof(LargestSDNode),
152 AlignOf<MostAlignedSDNode>::Alignment>
155 /// NodeAllocator - Pool allocation for nodes.
156 NodeAllocatorType NodeAllocator;
158 /// CSEMap - This structure is used to memoize nodes, automatically performing
159 /// CSE with existing nodes when a duplicate is requested.
160 FoldingSet<SDNode> CSEMap;
162 /// OperandAllocator - Pool allocation for machine-opcode SDNode operands.
163 BumpPtrAllocator OperandAllocator;
165 /// Allocator - Pool allocation for misc. objects that are created once per
167 BumpPtrAllocator Allocator;
169 /// SDNodeOrdering - The ordering of the SDNodes. It roughly corresponds to
170 /// the ordering of the original LLVM instructions.
171 SDNodeOrdering *Ordering;
173 /// DbgInfo - Tracks dbg_value information through SDISel.
177 /// DAGUpdateListener - Clients of various APIs that cause global effects on
178 /// the DAG can optionally implement this interface. This allows the clients
179 /// to handle the various sorts of updates that happen.
181 /// A DAGUpdateListener automatically registers itself with DAG when it is
182 /// constructed, and removes itself when destroyed in RAII fashion.
183 struct DAGUpdateListener {
184 DAGUpdateListener *const Next;
187 explicit DAGUpdateListener(SelectionDAG &D)
188 : Next(D.UpdateListeners), DAG(D) {
189 DAG.UpdateListeners = this;
192 virtual ~DAGUpdateListener() {
193 assert(DAG.UpdateListeners == this &&
194 "DAGUpdateListeners must be destroyed in LIFO order");
195 DAG.UpdateListeners = Next;
198 /// NodeDeleted - The node N that was deleted and, if E is not null, an
199 /// equivalent node E that replaced it.
200 virtual void NodeDeleted(SDNode *N, SDNode *E);
202 /// NodeUpdated - The node N that was updated.
203 virtual void NodeUpdated(SDNode *N);
207 /// DAGUpdateListener is a friend so it can manipulate the listener stack.
208 friend struct DAGUpdateListener;
210 /// UpdateListeners - Linked list of registered DAGUpdateListener instances.
211 /// This stack is maintained by DAGUpdateListener RAII.
212 DAGUpdateListener *UpdateListeners;
214 /// setGraphColorHelper - Implementation of setSubgraphColor.
215 /// Return whether we had to truncate the search.
217 bool setSubgraphColorHelper(SDNode *N, const char *Color,
218 DenseSet<SDNode *> &visited,
219 int level, bool &printed);
221 void operator=(const SelectionDAG&) LLVM_DELETED_FUNCTION;
222 SelectionDAG(const SelectionDAG&) LLVM_DELETED_FUNCTION;
225 explicit SelectionDAG(const TargetMachine &TM, llvm::CodeGenOpt::Level);
228 /// init - Prepare this SelectionDAG to process code in the given
231 void init(MachineFunction &mf, const TargetTransformInfo *TTI);
233 /// clear - Clear state and free memory necessary to make this
234 /// SelectionDAG ready to process a new block.
238 MachineFunction &getMachineFunction() const { return *MF; }
239 const TargetMachine &getTarget() const { return TM; }
240 const TargetLowering &getTargetLoweringInfo() const { return TLI; }
241 const TargetSelectionDAGInfo &getSelectionDAGInfo() const { return TSI; }
242 const TargetTransformInfo *getTargetTransformInfo() const { return TTI; }
243 LLVMContext *getContext() const {return Context; }
245 /// viewGraph - Pop up a GraphViz/gv window with the DAG rendered using 'dot'.
247 void viewGraph(const std::string &Title);
251 std::map<const SDNode *, std::string> NodeGraphAttrs;
254 /// clearGraphAttrs - Clear all previously defined node graph attributes.
255 /// Intended to be used from a debugging tool (eg. gdb).
256 void clearGraphAttrs();
258 /// setGraphAttrs - Set graph attributes for a node. (eg. "color=red".)
260 void setGraphAttrs(const SDNode *N, const char *Attrs);
262 /// getGraphAttrs - Get graph attributes for a node. (eg. "color=red".)
263 /// Used from getNodeAttributes.
264 const std::string getGraphAttrs(const SDNode *N) const;
266 /// setGraphColor - Convenience for setting node color attribute.
268 void setGraphColor(const SDNode *N, const char *Color);
270 /// setGraphColor - Convenience for setting subgraph color attribute.
272 void setSubgraphColor(SDNode *N, const char *Color);
274 typedef ilist<SDNode>::const_iterator allnodes_const_iterator;
275 allnodes_const_iterator allnodes_begin() const { return AllNodes.begin(); }
276 allnodes_const_iterator allnodes_end() const { return AllNodes.end(); }
277 typedef ilist<SDNode>::iterator allnodes_iterator;
278 allnodes_iterator allnodes_begin() { return AllNodes.begin(); }
279 allnodes_iterator allnodes_end() { return AllNodes.end(); }
280 ilist<SDNode>::size_type allnodes_size() const {
281 return AllNodes.size();
284 /// getRoot - Return the root tag of the SelectionDAG.
286 const SDValue &getRoot() const { return Root; }
288 /// getEntryNode - Return the token chain corresponding to the entry of the
290 SDValue getEntryNode() const {
291 return SDValue(const_cast<SDNode *>(&EntryNode), 0);
294 /// setRoot - Set the current root tag of the SelectionDAG.
296 const SDValue &setRoot(SDValue N) {
297 assert((!N.getNode() || N.getValueType() == MVT::Other) &&
298 "DAG root value is not a chain!");
300 checkForCycles(N.getNode());
303 checkForCycles(this);
307 /// Combine - This iterates over the nodes in the SelectionDAG, folding
308 /// certain types of nodes together, or eliminating superfluous nodes. The
309 /// Level argument controls whether Combine is allowed to produce nodes and
310 /// types that are illegal on the target.
311 void Combine(CombineLevel Level, AliasAnalysis &AA,
312 CodeGenOpt::Level OptLevel);
314 /// LegalizeTypes - This transforms the SelectionDAG into a SelectionDAG that
315 /// only uses types natively supported by the target. Returns "true" if it
316 /// made any changes.
318 /// Note that this is an involved process that may invalidate pointers into
320 bool LegalizeTypes();
322 /// Legalize - This transforms the SelectionDAG into a SelectionDAG that is
323 /// compatible with the target instruction selector, as indicated by the
324 /// TargetLowering object.
326 /// Note that this is an involved process that may invalidate pointers into
330 /// LegalizeVectors - This transforms the SelectionDAG into a SelectionDAG
331 /// that only uses vector math operations supported by the target. This is
332 /// necessary as a separate step from Legalize because unrolling a vector
333 /// operation can introduce illegal types, which requires running
334 /// LegalizeTypes again.
336 /// This returns true if it made any changes; in that case, LegalizeTypes
337 /// is called again before Legalize.
339 /// Note that this is an involved process that may invalidate pointers into
341 bool LegalizeVectors();
343 /// RemoveDeadNodes - This method deletes all unreachable nodes in the
345 void RemoveDeadNodes();
347 /// DeleteNode - Remove the specified node from the system. This node must
348 /// have no referrers.
349 void DeleteNode(SDNode *N);
351 /// getVTList - Return an SDVTList that represents the list of values
353 SDVTList getVTList(EVT VT);
354 SDVTList getVTList(EVT VT1, EVT VT2);
355 SDVTList getVTList(EVT VT1, EVT VT2, EVT VT3);
356 SDVTList getVTList(EVT VT1, EVT VT2, EVT VT3, EVT VT4);
357 SDVTList getVTList(const EVT *VTs, unsigned NumVTs);
359 //===--------------------------------------------------------------------===//
360 // Node creation methods.
362 SDValue getConstant(uint64_t Val, EVT VT, bool isTarget = false);
363 SDValue getConstant(const APInt &Val, EVT VT, bool isTarget = false);
364 SDValue getConstant(const ConstantInt &Val, EVT VT, bool isTarget = false);
365 SDValue getIntPtrConstant(uint64_t Val, bool isTarget = false);
366 SDValue getTargetConstant(uint64_t Val, EVT VT) {
367 return getConstant(Val, VT, true);
369 SDValue getTargetConstant(const APInt &Val, EVT VT) {
370 return getConstant(Val, VT, true);
372 SDValue getTargetConstant(const ConstantInt &Val, EVT VT) {
373 return getConstant(Val, VT, true);
375 // The forms below that take a double should only be used for simple
376 // constants that can be exactly represented in VT. No checks are made.
377 SDValue getConstantFP(double Val, EVT VT, bool isTarget = false);
378 SDValue getConstantFP(const APFloat& Val, EVT VT, bool isTarget = false);
379 SDValue getConstantFP(const ConstantFP &CF, EVT VT, bool isTarget = false);
380 SDValue getTargetConstantFP(double Val, EVT VT) {
381 return getConstantFP(Val, VT, true);
383 SDValue getTargetConstantFP(const APFloat& Val, EVT VT) {
384 return getConstantFP(Val, VT, true);
386 SDValue getTargetConstantFP(const ConstantFP &Val, EVT VT) {
387 return getConstantFP(Val, VT, true);
389 SDValue getGlobalAddress(const GlobalValue *GV, DebugLoc DL, EVT VT,
390 int64_t offset = 0, bool isTargetGA = false,
391 unsigned char TargetFlags = 0);
392 SDValue getTargetGlobalAddress(const GlobalValue *GV, DebugLoc DL, EVT VT,
394 unsigned char TargetFlags = 0) {
395 return getGlobalAddress(GV, DL, VT, offset, true, TargetFlags);
397 SDValue getFrameIndex(int FI, EVT VT, bool isTarget = false);
398 SDValue getTargetFrameIndex(int FI, EVT VT) {
399 return getFrameIndex(FI, VT, true);
401 SDValue getJumpTable(int JTI, EVT VT, bool isTarget = false,
402 unsigned char TargetFlags = 0);
403 SDValue getTargetJumpTable(int JTI, EVT VT, unsigned char TargetFlags = 0) {
404 return getJumpTable(JTI, VT, true, TargetFlags);
406 SDValue getConstantPool(const Constant *C, EVT VT,
407 unsigned Align = 0, int Offs = 0, bool isT=false,
408 unsigned char TargetFlags = 0);
409 SDValue getTargetConstantPool(const Constant *C, EVT VT,
410 unsigned Align = 0, int Offset = 0,
411 unsigned char TargetFlags = 0) {
412 return getConstantPool(C, VT, Align, Offset, true, TargetFlags);
414 SDValue getConstantPool(MachineConstantPoolValue *C, EVT VT,
415 unsigned Align = 0, int Offs = 0, bool isT=false,
416 unsigned char TargetFlags = 0);
417 SDValue getTargetConstantPool(MachineConstantPoolValue *C,
418 EVT VT, unsigned Align = 0,
419 int Offset = 0, unsigned char TargetFlags=0) {
420 return getConstantPool(C, VT, Align, Offset, true, TargetFlags);
422 SDValue getTargetIndex(int Index, EVT VT, int64_t Offset = 0,
423 unsigned char TargetFlags = 0);
424 // When generating a branch to a BB, we don't in general know enough
425 // to provide debug info for the BB at that time, so keep this one around.
426 SDValue getBasicBlock(MachineBasicBlock *MBB);
427 SDValue getBasicBlock(MachineBasicBlock *MBB, DebugLoc dl);
428 SDValue getExternalSymbol(const char *Sym, EVT VT);
429 SDValue getExternalSymbol(const char *Sym, DebugLoc dl, EVT VT);
430 SDValue getTargetExternalSymbol(const char *Sym, EVT VT,
431 unsigned char TargetFlags = 0);
432 SDValue getValueType(EVT);
433 SDValue getRegister(unsigned Reg, EVT VT);
434 SDValue getRegisterMask(const uint32_t *RegMask);
435 SDValue getEHLabel(DebugLoc dl, SDValue Root, MCSymbol *Label);
436 SDValue getBlockAddress(const BlockAddress *BA, EVT VT,
437 int64_t Offset = 0, bool isTarget = false,
438 unsigned char TargetFlags = 0);
439 SDValue getTargetBlockAddress(const BlockAddress *BA, EVT VT,
441 unsigned char TargetFlags = 0) {
442 return getBlockAddress(BA, VT, Offset, true, TargetFlags);
445 SDValue getCopyToReg(SDValue Chain, DebugLoc dl, unsigned Reg, SDValue N) {
446 return getNode(ISD::CopyToReg, dl, MVT::Other, Chain,
447 getRegister(Reg, N.getValueType()), N);
450 // This version of the getCopyToReg method takes an extra operand, which
451 // indicates that there is potentially an incoming glue value (if Glue is not
452 // null) and that there should be a glue result.
453 SDValue getCopyToReg(SDValue Chain, DebugLoc dl, unsigned Reg, SDValue N,
455 SDVTList VTs = getVTList(MVT::Other, MVT::Glue);
456 SDValue Ops[] = { Chain, getRegister(Reg, N.getValueType()), N, Glue };
457 return getNode(ISD::CopyToReg, dl, VTs, Ops, Glue.getNode() ? 4 : 3);
460 // Similar to last getCopyToReg() except parameter Reg is a SDValue
461 SDValue getCopyToReg(SDValue Chain, DebugLoc dl, SDValue Reg, SDValue N,
463 SDVTList VTs = getVTList(MVT::Other, MVT::Glue);
464 SDValue Ops[] = { Chain, Reg, N, Glue };
465 return getNode(ISD::CopyToReg, dl, VTs, Ops, Glue.getNode() ? 4 : 3);
468 SDValue getCopyFromReg(SDValue Chain, DebugLoc dl, unsigned Reg, EVT VT) {
469 SDVTList VTs = getVTList(VT, MVT::Other);
470 SDValue Ops[] = { Chain, getRegister(Reg, VT) };
471 return getNode(ISD::CopyFromReg, dl, VTs, Ops, 2);
474 // This version of the getCopyFromReg method takes an extra operand, which
475 // indicates that there is potentially an incoming glue value (if Glue is not
476 // null) and that there should be a glue result.
477 SDValue getCopyFromReg(SDValue Chain, DebugLoc dl, unsigned Reg, EVT VT,
479 SDVTList VTs = getVTList(VT, MVT::Other, MVT::Glue);
480 SDValue Ops[] = { Chain, getRegister(Reg, VT), Glue };
481 return getNode(ISD::CopyFromReg, dl, VTs, Ops, Glue.getNode() ? 3 : 2);
484 SDValue getCondCode(ISD::CondCode Cond);
486 /// Returns the ConvertRndSat Note: Avoid using this node because it may
487 /// disappear in the future and most targets don't support it.
488 SDValue getConvertRndSat(EVT VT, DebugLoc dl, SDValue Val, SDValue DTy,
490 SDValue Rnd, SDValue Sat, ISD::CvtCode Code);
492 /// getVectorShuffle - Return an ISD::VECTOR_SHUFFLE node. The number of
493 /// elements in VT, which must be a vector type, must match the number of
494 /// mask elements NumElts. A integer mask element equal to -1 is treated as
496 SDValue getVectorShuffle(EVT VT, DebugLoc dl, SDValue N1, SDValue N2,
497 const int *MaskElts);
499 /// getAnyExtOrTrunc - Convert Op, which must be of integer type, to the
500 /// integer type VT, by either any-extending or truncating it.
501 SDValue getAnyExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT);
503 /// getSExtOrTrunc - Convert Op, which must be of integer type, to the
504 /// integer type VT, by either sign-extending or truncating it.
505 SDValue getSExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT);
507 /// getZExtOrTrunc - Convert Op, which must be of integer type, to the
508 /// integer type VT, by either zero-extending or truncating it.
509 SDValue getZExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT);
511 /// getZeroExtendInReg - Return the expression required to zero extend the Op
512 /// value assuming it was the smaller SrcTy value.
513 SDValue getZeroExtendInReg(SDValue Op, DebugLoc DL, EVT SrcTy);
515 /// getNOT - Create a bitwise NOT operation as (XOR Val, -1).
516 SDValue getNOT(DebugLoc DL, SDValue Val, EVT VT);
518 /// getCALLSEQ_START - Return a new CALLSEQ_START node, which always must have
519 /// a glue result (to ensure it's not CSE'd). CALLSEQ_START does not have a
521 SDValue getCALLSEQ_START(SDValue Chain, SDValue Op) {
522 SDVTList VTs = getVTList(MVT::Other, MVT::Glue);
523 SDValue Ops[] = { Chain, Op };
524 return getNode(ISD::CALLSEQ_START, DebugLoc(), VTs, Ops, 2);
527 /// getCALLSEQ_END - Return a new CALLSEQ_END node, which always must have a
528 /// glue result (to ensure it's not CSE'd). CALLSEQ_END does not have
529 /// a useful DebugLoc.
530 SDValue getCALLSEQ_END(SDValue Chain, SDValue Op1, SDValue Op2,
532 SDVTList NodeTys = getVTList(MVT::Other, MVT::Glue);
533 SmallVector<SDValue, 4> Ops;
534 Ops.push_back(Chain);
537 Ops.push_back(InGlue);
538 return getNode(ISD::CALLSEQ_END, DebugLoc(), NodeTys, &Ops[0],
539 (unsigned)Ops.size() - (InGlue.getNode() == 0 ? 1 : 0));
542 /// getUNDEF - Return an UNDEF node. UNDEF does not have a useful DebugLoc.
543 SDValue getUNDEF(EVT VT) {
544 return getNode(ISD::UNDEF, DebugLoc(), VT);
547 /// getGLOBAL_OFFSET_TABLE - Return a GLOBAL_OFFSET_TABLE node. This does
548 /// not have a useful DebugLoc.
549 SDValue getGLOBAL_OFFSET_TABLE(EVT VT) {
550 return getNode(ISD::GLOBAL_OFFSET_TABLE, DebugLoc(), VT);
553 /// getNode - Gets or creates the specified node.
555 SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT);
556 SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT, SDValue N);
557 SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT, SDValue N1, SDValue N2);
558 SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
559 SDValue N1, SDValue N2, SDValue N3);
560 SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
561 SDValue N1, SDValue N2, SDValue N3, SDValue N4);
562 SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
563 SDValue N1, SDValue N2, SDValue N3, SDValue N4,
565 SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
566 const SDUse *Ops, unsigned NumOps);
567 SDValue getNode(unsigned Opcode, DebugLoc DL, EVT VT,
568 const SDValue *Ops, unsigned NumOps);
569 SDValue getNode(unsigned Opcode, DebugLoc DL,
570 ArrayRef<EVT> ResultTys,
571 const SDValue *Ops, unsigned NumOps);
572 SDValue getNode(unsigned Opcode, DebugLoc DL, const EVT *VTs, unsigned NumVTs,
573 const SDValue *Ops, unsigned NumOps);
574 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
575 const SDValue *Ops, unsigned NumOps);
576 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs);
577 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, SDValue N);
578 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
579 SDValue N1, SDValue N2);
580 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
581 SDValue N1, SDValue N2, SDValue N3);
582 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
583 SDValue N1, SDValue N2, SDValue N3, SDValue N4);
584 SDValue getNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
585 SDValue N1, SDValue N2, SDValue N3, SDValue N4,
588 /// getStackArgumentTokenFactor - Compute a TokenFactor to force all
589 /// the incoming stack arguments to be loaded from the stack. This is
590 /// used in tail call lowering to protect stack arguments from being
592 SDValue getStackArgumentTokenFactor(SDValue Chain);
594 SDValue getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src,
595 SDValue Size, unsigned Align, bool isVol, bool AlwaysInline,
596 MachinePointerInfo DstPtrInfo,
597 MachinePointerInfo SrcPtrInfo);
599 SDValue getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src,
600 SDValue Size, unsigned Align, bool isVol,
601 MachinePointerInfo DstPtrInfo,
602 MachinePointerInfo SrcPtrInfo);
604 SDValue getMemset(SDValue Chain, DebugLoc dl, SDValue Dst, SDValue Src,
605 SDValue Size, unsigned Align, bool isVol,
606 MachinePointerInfo DstPtrInfo);
608 /// getSetCC - Helper function to make it easier to build SetCC's if you just
609 /// have an ISD::CondCode instead of an SDValue.
611 SDValue getSetCC(DebugLoc DL, EVT VT, SDValue LHS, SDValue RHS,
612 ISD::CondCode Cond) {
613 assert(LHS.getValueType().isVector() == RHS.getValueType().isVector() &&
614 "Cannot compare scalars to vectors");
615 assert(LHS.getValueType().isVector() == VT.isVector() &&
616 "Cannot compare scalars to vectors");
617 return getNode(ISD::SETCC, DL, VT, LHS, RHS, getCondCode(Cond));
620 /// getSelectCC - Helper function to make it easier to build SelectCC's if you
621 /// just have an ISD::CondCode instead of an SDValue.
623 SDValue getSelectCC(DebugLoc DL, SDValue LHS, SDValue RHS,
624 SDValue True, SDValue False, ISD::CondCode Cond) {
625 return getNode(ISD::SELECT_CC, DL, True.getValueType(),
626 LHS, RHS, True, False, getCondCode(Cond));
629 /// getVAArg - VAArg produces a result and token chain, and takes a pointer
630 /// and a source value as input.
631 SDValue getVAArg(EVT VT, DebugLoc dl, SDValue Chain, SDValue Ptr,
632 SDValue SV, unsigned Align);
634 /// getAtomic - Gets a node for an atomic op, produces result and chain and
636 SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, SDValue Chain,
637 SDValue Ptr, SDValue Cmp, SDValue Swp,
638 MachinePointerInfo PtrInfo, unsigned Alignment,
639 AtomicOrdering Ordering,
640 SynchronizationScope SynchScope);
641 SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, SDValue Chain,
642 SDValue Ptr, SDValue Cmp, SDValue Swp,
643 MachineMemOperand *MMO,
644 AtomicOrdering Ordering,
645 SynchronizationScope SynchScope);
647 /// getAtomic - Gets a node for an atomic op, produces result (if relevant)
648 /// and chain and takes 2 operands.
649 SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, SDValue Chain,
650 SDValue Ptr, SDValue Val, const Value* PtrVal,
651 unsigned Alignment, AtomicOrdering Ordering,
652 SynchronizationScope SynchScope);
653 SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, SDValue Chain,
654 SDValue Ptr, SDValue Val, MachineMemOperand *MMO,
655 AtomicOrdering Ordering,
656 SynchronizationScope SynchScope);
658 /// getAtomic - Gets a node for an atomic op, produces result and chain and
660 SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, EVT VT,
661 SDValue Chain, SDValue Ptr, const Value* PtrVal,
663 AtomicOrdering Ordering,
664 SynchronizationScope SynchScope);
665 SDValue getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, EVT VT,
666 SDValue Chain, SDValue Ptr, MachineMemOperand *MMO,
667 AtomicOrdering Ordering,
668 SynchronizationScope SynchScope);
670 /// getMemIntrinsicNode - Creates a MemIntrinsicNode that may produce a
671 /// result and takes a list of operands. Opcode may be INTRINSIC_VOID,
672 /// INTRINSIC_W_CHAIN, or a target-specific opcode with a value not
673 /// less than FIRST_TARGET_MEMORY_OPCODE.
674 SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl,
675 const EVT *VTs, unsigned NumVTs,
676 const SDValue *Ops, unsigned NumOps,
677 EVT MemVT, MachinePointerInfo PtrInfo,
678 unsigned Align = 0, bool Vol = false,
679 bool ReadMem = true, bool WriteMem = true);
681 SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
682 const SDValue *Ops, unsigned NumOps,
683 EVT MemVT, MachinePointerInfo PtrInfo,
684 unsigned Align = 0, bool Vol = false,
685 bool ReadMem = true, bool WriteMem = true);
687 SDValue getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
688 const SDValue *Ops, unsigned NumOps,
689 EVT MemVT, MachineMemOperand *MMO);
691 /// getMergeValues - Create a MERGE_VALUES node from the given operands.
692 SDValue getMergeValues(const SDValue *Ops, unsigned NumOps, DebugLoc dl);
694 /// getLoad - Loads are not normal binary operators: their result type is not
695 /// determined by their operands, and they produce a value AND a token chain.
697 SDValue getLoad(EVT VT, DebugLoc dl, SDValue Chain, SDValue Ptr,
698 MachinePointerInfo PtrInfo, bool isVolatile,
699 bool isNonTemporal, bool isInvariant, unsigned Alignment,
700 const MDNode *TBAAInfo = 0, const MDNode *Ranges = 0);
701 SDValue getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, EVT VT,
702 SDValue Chain, SDValue Ptr, MachinePointerInfo PtrInfo,
703 EVT MemVT, bool isVolatile,
704 bool isNonTemporal, unsigned Alignment,
705 const MDNode *TBAAInfo = 0);
706 SDValue getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base,
707 SDValue Offset, ISD::MemIndexedMode AM);
708 SDValue getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
710 SDValue Chain, SDValue Ptr, SDValue Offset,
711 MachinePointerInfo PtrInfo, EVT MemVT,
712 bool isVolatile, bool isNonTemporal, bool isInvariant,
713 unsigned Alignment, const MDNode *TBAAInfo = 0,
714 const MDNode *Ranges = 0);
715 SDValue getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
717 SDValue Chain, SDValue Ptr, SDValue Offset,
718 EVT MemVT, MachineMemOperand *MMO);
720 /// getStore - Helper function to build ISD::STORE nodes.
722 SDValue getStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
723 MachinePointerInfo PtrInfo, bool isVolatile,
724 bool isNonTemporal, unsigned Alignment,
725 const MDNode *TBAAInfo = 0);
726 SDValue getStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
727 MachineMemOperand *MMO);
728 SDValue getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
729 MachinePointerInfo PtrInfo, EVT TVT,
730 bool isNonTemporal, bool isVolatile,
732 const MDNode *TBAAInfo = 0);
733 SDValue getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, SDValue Ptr,
734 EVT TVT, MachineMemOperand *MMO);
735 SDValue getIndexedStore(SDValue OrigStoe, DebugLoc dl, SDValue Base,
736 SDValue Offset, ISD::MemIndexedMode AM);
738 /// getSrcValue - Construct a node to track a Value* through the backend.
739 SDValue getSrcValue(const Value *v);
741 /// getMDNode - Return an MDNodeSDNode which holds an MDNode.
742 SDValue getMDNode(const MDNode *MD);
744 /// getShiftAmountOperand - Return the specified value casted to
745 /// the target's desired shift amount type.
746 SDValue getShiftAmountOperand(EVT LHSTy, SDValue Op);
748 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
749 /// specified operands. If the resultant node already exists in the DAG,
750 /// this does not modify the specified node, instead it returns the node that
751 /// already exists. If the resultant node does not exist in the DAG, the
752 /// input node is returned. As a degenerate case, if you specify the same
753 /// input operands as the node already has, the input node is returned.
754 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op);
755 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2);
756 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
758 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
759 SDValue Op3, SDValue Op4);
760 SDNode *UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
761 SDValue Op3, SDValue Op4, SDValue Op5);
762 SDNode *UpdateNodeOperands(SDNode *N,
763 const SDValue *Ops, unsigned NumOps);
765 /// SelectNodeTo - These are used for target selectors to *mutate* the
766 /// specified node to have the specified return type, Target opcode, and
767 /// operands. Note that target opcodes are stored as
768 /// ~TargetOpcode in the node opcode field. The resultant node is returned.
769 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT);
770 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT, SDValue Op1);
771 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT,
772 SDValue Op1, SDValue Op2);
773 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT,
774 SDValue Op1, SDValue Op2, SDValue Op3);
775 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT,
776 const SDValue *Ops, unsigned NumOps);
777 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1, EVT VT2);
778 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
779 EVT VT2, const SDValue *Ops, unsigned NumOps);
780 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
781 EVT VT2, EVT VT3, const SDValue *Ops, unsigned NumOps);
782 SDNode *SelectNodeTo(SDNode *N, unsigned MachineOpc, EVT VT1,
783 EVT VT2, EVT VT3, EVT VT4, const SDValue *Ops,
785 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
786 EVT VT2, SDValue Op1);
787 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
788 EVT VT2, SDValue Op1, SDValue Op2);
789 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
790 EVT VT2, SDValue Op1, SDValue Op2, SDValue Op3);
791 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, EVT VT1,
792 EVT VT2, EVT VT3, SDValue Op1, SDValue Op2, SDValue Op3);
793 SDNode *SelectNodeTo(SDNode *N, unsigned TargetOpc, SDVTList VTs,
794 const SDValue *Ops, unsigned NumOps);
796 /// MorphNodeTo - This *mutates* the specified node to have the specified
797 /// return type, opcode, and operands.
798 SDNode *MorphNodeTo(SDNode *N, unsigned Opc, SDVTList VTs,
799 const SDValue *Ops, unsigned NumOps);
801 /// getMachineNode - These are used for target selectors to create a new node
802 /// with specified return type(s), MachineInstr opcode, and operands.
804 /// Note that getMachineNode returns the resultant node. If there is already
805 /// a node of the specified opcode and operands, it returns that node instead
806 /// of the current one.
807 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT);
808 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
810 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
811 SDValue Op1, SDValue Op2);
812 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
813 SDValue Op1, SDValue Op2, SDValue Op3);
814 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
815 ArrayRef<SDValue> Ops);
816 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2);
817 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
819 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
820 SDValue Op1, SDValue Op2);
821 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
822 SDValue Op1, SDValue Op2, SDValue Op3);
823 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
824 ArrayRef<SDValue> Ops);
825 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
826 EVT VT3, SDValue Op1, SDValue Op2);
827 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
828 EVT VT3, SDValue Op1, SDValue Op2,
830 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
831 EVT VT3, ArrayRef<SDValue> Ops);
832 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2,
833 EVT VT3, EVT VT4, ArrayRef<SDValue> Ops);
834 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl,
835 ArrayRef<EVT> ResultTys,
836 ArrayRef<SDValue> Ops);
837 MachineSDNode *getMachineNode(unsigned Opcode, DebugLoc dl, SDVTList VTs,
838 ArrayRef<SDValue> Ops);
840 /// getTargetExtractSubreg - A convenience function for creating
841 /// TargetInstrInfo::EXTRACT_SUBREG nodes.
842 SDValue getTargetExtractSubreg(int SRIdx, DebugLoc DL, EVT VT,
845 /// getTargetInsertSubreg - A convenience function for creating
846 /// TargetInstrInfo::INSERT_SUBREG nodes.
847 SDValue getTargetInsertSubreg(int SRIdx, DebugLoc DL, EVT VT,
848 SDValue Operand, SDValue Subreg);
850 /// getNodeIfExists - Get the specified node if it's already available, or
851 /// else return NULL.
852 SDNode *getNodeIfExists(unsigned Opcode, SDVTList VTs,
853 const SDValue *Ops, unsigned NumOps);
855 /// getDbgValue - Creates a SDDbgValue node.
857 SDDbgValue *getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R, uint64_t Off,
858 DebugLoc DL, unsigned O);
859 SDDbgValue *getDbgValue(MDNode *MDPtr, const Value *C, uint64_t Off,
860 DebugLoc DL, unsigned O);
861 SDDbgValue *getDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off,
862 DebugLoc DL, unsigned O);
864 /// RemoveDeadNode - Remove the specified node from the system. If any of its
865 /// operands then becomes dead, remove them as well. Inform UpdateListener
866 /// for each node deleted.
867 void RemoveDeadNode(SDNode *N);
869 /// RemoveDeadNodes - This method deletes the unreachable nodes in the
870 /// given list, and any nodes that become unreachable as a result.
871 void RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes);
873 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
874 /// This can cause recursive merging of nodes in the DAG. Use the first
875 /// version if 'From' is known to have a single result, use the second
876 /// if you have two nodes with identical results (or if 'To' has a superset
877 /// of the results of 'From'), use the third otherwise.
879 /// These methods all take an optional UpdateListener, which (if not null) is
880 /// informed about nodes that are deleted and modified due to recursive
881 /// changes in the dag.
883 /// These functions only replace all existing uses. It's possible that as
884 /// these replacements are being performed, CSE may cause the From node
885 /// to be given new uses. These new uses of From are left in place, and
886 /// not automatically transferred to To.
888 void ReplaceAllUsesWith(SDValue From, SDValue Op);
889 void ReplaceAllUsesWith(SDNode *From, SDNode *To);
890 void ReplaceAllUsesWith(SDNode *From, const SDValue *To);
892 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
893 /// uses of other values produced by From.Val alone.
894 void ReplaceAllUsesOfValueWith(SDValue From, SDValue To);
896 /// ReplaceAllUsesOfValuesWith - Like ReplaceAllUsesOfValueWith, but
897 /// for multiple values at once. This correctly handles the case where
898 /// there is an overlap between the From values and the To values.
899 void ReplaceAllUsesOfValuesWith(const SDValue *From, const SDValue *To,
902 /// AssignTopologicalOrder - Topological-sort the AllNodes list and a
903 /// assign a unique node id for each node in the DAG based on their
904 /// topological order. Returns the number of nodes.
905 unsigned AssignTopologicalOrder();
907 /// RepositionNode - Move node N in the AllNodes list to be immediately
908 /// before the given iterator Position. This may be used to update the
909 /// topological ordering when the list of nodes is modified.
910 void RepositionNode(allnodes_iterator Position, SDNode *N) {
911 AllNodes.insert(Position, AllNodes.remove(N));
914 /// isCommutativeBinOp - Returns true if the opcode is a commutative binary
916 static bool isCommutativeBinOp(unsigned Opcode) {
917 // FIXME: This should get its info from the td file, so that we can include
934 case ISD::ADDE: return true;
935 default: return false;
939 /// Returns an APFloat semantics tag appropriate for the given type. If VT is
940 /// a vector type, the element semantics are returned.
941 static const fltSemantics &EVTToAPFloatSemantics(EVT VT) {
942 switch (VT.getScalarType().getSimpleVT().SimpleTy) {
943 default: llvm_unreachable("Unknown FP format");
944 case MVT::f16: return APFloat::IEEEhalf;
945 case MVT::f32: return APFloat::IEEEsingle;
946 case MVT::f64: return APFloat::IEEEdouble;
947 case MVT::f80: return APFloat::x87DoubleExtended;
948 case MVT::f128: return APFloat::IEEEquad;
949 case MVT::ppcf128: return APFloat::PPCDoubleDouble;
953 /// AssignOrdering - Assign an order to the SDNode.
954 void AssignOrdering(const SDNode *SD, unsigned Order);
956 /// GetOrdering - Get the order for the SDNode.
957 unsigned GetOrdering(const SDNode *SD) const;
959 /// AddDbgValue - Add a dbg_value SDNode. If SD is non-null that means the
960 /// value is produced by SD.
961 void AddDbgValue(SDDbgValue *DB, SDNode *SD, bool isParameter);
963 /// GetDbgValues - Get the debug values which reference the given SDNode.
964 ArrayRef<SDDbgValue*> GetDbgValues(const SDNode* SD) {
965 return DbgInfo->getSDDbgValues(SD);
968 /// TransferDbgValues - Transfer SDDbgValues.
969 void TransferDbgValues(SDValue From, SDValue To);
971 /// hasDebugValues - Return true if there are any SDDbgValue nodes associated
972 /// with this SelectionDAG.
973 bool hasDebugValues() const { return !DbgInfo->empty(); }
975 SDDbgInfo::DbgIterator DbgBegin() { return DbgInfo->DbgBegin(); }
976 SDDbgInfo::DbgIterator DbgEnd() { return DbgInfo->DbgEnd(); }
977 SDDbgInfo::DbgIterator ByvalParmDbgBegin() {
978 return DbgInfo->ByvalParmDbgBegin();
980 SDDbgInfo::DbgIterator ByvalParmDbgEnd() {
981 return DbgInfo->ByvalParmDbgEnd();
986 /// CreateStackTemporary - Create a stack temporary, suitable for holding the
987 /// specified value type. If minAlign is specified, the slot size will have
988 /// at least that alignment.
989 SDValue CreateStackTemporary(EVT VT, unsigned minAlign = 1);
991 /// CreateStackTemporary - Create a stack temporary suitable for holding
992 /// either of the specified value types.
993 SDValue CreateStackTemporary(EVT VT1, EVT VT2);
995 /// FoldConstantArithmetic -
996 SDValue FoldConstantArithmetic(unsigned Opcode, EVT VT,
997 SDNode *Cst1, SDNode *Cst2);
999 /// FoldSetCC - Constant fold a setcc to true or false.
1000 SDValue FoldSetCC(EVT VT, SDValue N1,
1001 SDValue N2, ISD::CondCode Cond, DebugLoc dl);
1003 /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
1004 /// use this predicate to simplify operations downstream.
1005 bool SignBitIsZero(SDValue Op, unsigned Depth = 0) const;
1007 /// MaskedValueIsZero - Return true if 'Op & Mask' is known to be zero. We
1008 /// use this predicate to simplify operations downstream. Op and Mask are
1009 /// known to be the same type.
1010 bool MaskedValueIsZero(SDValue Op, const APInt &Mask, unsigned Depth = 0)
1013 /// ComputeMaskedBits - Determine which of the bits specified in Mask are
1014 /// known to be either zero or one and return them in the KnownZero/KnownOne
1015 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit
1016 /// processing. Targets can implement the computeMaskedBitsForTargetNode
1017 /// method in the TargetLowering class to allow target nodes to be understood.
1018 void ComputeMaskedBits(SDValue Op, APInt &KnownZero, APInt &KnownOne,
1019 unsigned Depth = 0) const;
1021 /// ComputeNumSignBits - Return the number of times the sign bit of the
1022 /// register is replicated into the other bits. We know that at least 1 bit
1023 /// is always equal to the sign bit (itself), but other cases can give us
1024 /// information. For example, immediately after an "SRA X, 2", we know that
1025 /// the top 3 bits are all equal to each other, so we return 3. Targets can
1026 /// implement the ComputeNumSignBitsForTarget method in the TargetLowering
1027 /// class to allow target nodes to be understood.
1028 unsigned ComputeNumSignBits(SDValue Op, unsigned Depth = 0) const;
1030 /// isBaseWithConstantOffset - Return true if the specified operand is an
1031 /// ISD::ADD with a ConstantSDNode on the right-hand side, or if it is an
1032 /// ISD::OR with a ConstantSDNode that is guaranteed to have the same
1033 /// semantics as an ADD. This handles the equivalence:
1034 /// X|Cst == X+Cst iff X&Cst = 0.
1035 bool isBaseWithConstantOffset(SDValue Op) const;
1037 /// isKnownNeverNan - Test whether the given SDValue is known to never be NaN.
1038 bool isKnownNeverNaN(SDValue Op) const;
1040 /// isKnownNeverZero - Test whether the given SDValue is known to never be
1041 /// positive or negative Zero.
1042 bool isKnownNeverZero(SDValue Op) const;
1044 /// isEqualTo - Test whether two SDValues are known to compare equal. This
1045 /// is true if they are the same value, or if one is negative zero and the
1046 /// other positive zero.
1047 bool isEqualTo(SDValue A, SDValue B) const;
1049 /// UnrollVectorOp - Utility function used by legalize and lowering to
1050 /// "unroll" a vector operation by splitting out the scalars and operating
1051 /// on each element individually. If the ResNE is 0, fully unroll the vector
1052 /// op. If ResNE is less than the width of the vector op, unroll up to ResNE.
1053 /// If the ResNE is greater than the width of the vector op, unroll the
1054 /// vector op and fill the end of the resulting vector with UNDEFS.
1055 SDValue UnrollVectorOp(SDNode *N, unsigned ResNE = 0);
1057 /// isConsecutiveLoad - Return true if LD is loading 'Bytes' bytes from a
1058 /// location that is 'Dist' units away from the location that the 'Base' load
1059 /// is loading from.
1060 bool isConsecutiveLoad(LoadSDNode *LD, LoadSDNode *Base,
1061 unsigned Bytes, int Dist) const;
1063 /// InferPtrAlignment - Infer alignment of a load / store address. Return 0 if
1064 /// it cannot be inferred.
1065 unsigned InferPtrAlignment(SDValue Ptr) const;
1068 bool RemoveNodeFromCSEMaps(SDNode *N);
1069 void AddModifiedNodeToCSEMaps(SDNode *N);
1070 SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op, void *&InsertPos);
1071 SDNode *FindModifiedNodeSlot(SDNode *N, SDValue Op1, SDValue Op2,
1073 SDNode *FindModifiedNodeSlot(SDNode *N, const SDValue *Ops, unsigned NumOps,
1075 SDNode *UpdadeDebugLocOnMergedSDNode(SDNode *N, DebugLoc loc);
1077 void DeleteNodeNotInCSEMaps(SDNode *N);
1078 void DeallocateNode(SDNode *N);
1080 unsigned getEVTAlignment(EVT MemoryVT) const;
1082 void allnodes_clear();
1084 /// VTList - List of non-single value types.
1085 std::vector<SDVTList> VTList;
1087 /// CondCodeNodes - Maps to auto-CSE operations.
1088 std::vector<CondCodeSDNode*> CondCodeNodes;
1090 std::vector<SDNode*> ValueTypeNodes;
1091 std::map<EVT, SDNode*, EVT::compareRawBits> ExtendedValueTypeNodes;
1092 StringMap<SDNode*> ExternalSymbols;
1094 std::map<std::pair<std::string, unsigned char>,SDNode*> TargetExternalSymbols;
1097 template <> struct GraphTraits<SelectionDAG*> : public GraphTraits<SDNode*> {
1098 typedef SelectionDAG::allnodes_iterator nodes_iterator;
1099 static nodes_iterator nodes_begin(SelectionDAG *G) {
1100 return G->allnodes_begin();
1102 static nodes_iterator nodes_end(SelectionDAG *G) {
1103 return G->allnodes_end();
1107 } // end namespace llvm