1 //===-- SystemZISelDAGToDAG.cpp - A dag to dag inst selector for SystemZ --===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines an instruction selector for the SystemZ target.
12 //===----------------------------------------------------------------------===//
14 #include "SystemZTargetMachine.h"
15 #include "llvm/Analysis/AliasAnalysis.h"
16 #include "llvm/CodeGen/SelectionDAGISel.h"
17 #include "llvm/Support/Debug.h"
18 #include "llvm/Support/KnownBits.h"
19 #include "llvm/Support/raw_ostream.h"
23 #define DEBUG_TYPE "systemz-isel"
26 // Used to build addressing modes.
27 struct SystemZAddressingMode {
28 // The shape of the address.
33 // base+displacement+index for load and store operands
36 // base+displacement+index for load address operands
39 // base+displacement+index+ADJDYNALLOC
44 // The type of displacement. The enum names here correspond directly
45 // to the definitions in SystemZOperand.td. We could split them into
46 // flags -- single/pair, 128-bit, etc. -- but it hardly seems worth it.
56 // The parts of the address. The address is equivalent to:
58 // Base + Disp + Index + (IncludesDynAlloc ? ADJDYNALLOC : 0)
62 bool IncludesDynAlloc;
64 SystemZAddressingMode(AddrForm form, DispRange dr)
65 : Form(form), DR(dr), Base(), Disp(0), Index(),
66 IncludesDynAlloc(false) {}
68 // True if the address can have an index register.
69 bool hasIndexField() { return Form != FormBD; }
71 // True if the address can (and must) include ADJDYNALLOC.
72 bool isDynAlloc() { return Form == FormBDXDynAlloc; }
75 errs() << "SystemZAddressingMode " << this << '\n';
79 Base.getNode()->dump();
83 if (hasIndexField()) {
86 Index.getNode()->dump();
91 errs() << " Disp " << Disp;
93 errs() << " + ADJDYNALLOC";
98 // Return a mask with Count low bits set.
99 static uint64_t allOnes(unsigned int Count) {
103 return (uint64_t(1) << Count) - 1;
106 // Represents operands 2 to 5 of the ROTATE AND ... SELECTED BITS operation
107 // given by Opcode. The operands are: Input (R2), Start (I3), End (I4) and
108 // Rotate (I5). The combined operand value is effectively:
110 // (or (rotl Input, Rotate), ~Mask)
114 // (and (rotl Input, Rotate), Mask)
116 // otherwise. The output value has BitSize bits, although Input may be
117 // narrower (in which case the upper bits are don't care), or wider (in which
118 // case the result will be truncated as part of the operation).
119 struct RxSBGOperands {
120 RxSBGOperands(unsigned Op, SDValue N)
121 : Opcode(Op), BitSize(N.getValueSizeInBits()),
122 Mask(allOnes(BitSize)), Input(N), Start(64 - BitSize), End(63),
134 class SystemZDAGToDAGISel : public SelectionDAGISel {
135 const SystemZSubtarget *Subtarget;
137 // Used by SystemZOperands.td to create integer constants.
138 inline SDValue getImm(const SDNode *Node, uint64_t Imm) const {
139 return CurDAG->getTargetConstant(Imm, SDLoc(Node), Node->getValueType(0));
142 const SystemZTargetMachine &getTargetMachine() const {
143 return static_cast<const SystemZTargetMachine &>(TM);
146 const SystemZInstrInfo *getInstrInfo() const {
147 return Subtarget->getInstrInfo();
150 // Try to fold more of the base or index of AM into AM, where IsBase
151 // selects between the base and index.
152 bool expandAddress(SystemZAddressingMode &AM, bool IsBase) const;
154 // Try to describe N in AM, returning true on success.
155 bool selectAddress(SDValue N, SystemZAddressingMode &AM) const;
157 // Extract individual target operands from matched address AM.
158 void getAddressOperands(const SystemZAddressingMode &AM, EVT VT,
159 SDValue &Base, SDValue &Disp) const;
160 void getAddressOperands(const SystemZAddressingMode &AM, EVT VT,
161 SDValue &Base, SDValue &Disp, SDValue &Index) const;
163 // Try to match Addr as a FormBD address with displacement type DR.
164 // Return true on success, storing the base and displacement in
165 // Base and Disp respectively.
166 bool selectBDAddr(SystemZAddressingMode::DispRange DR, SDValue Addr,
167 SDValue &Base, SDValue &Disp) const;
169 // Try to match Addr as a FormBDX address with displacement type DR.
170 // Return true on success and if the result had no index. Store the
171 // base and displacement in Base and Disp respectively.
172 bool selectMVIAddr(SystemZAddressingMode::DispRange DR, SDValue Addr,
173 SDValue &Base, SDValue &Disp) const;
175 // Try to match Addr as a FormBDX* address of form Form with
176 // displacement type DR. Return true on success, storing the base,
177 // displacement and index in Base, Disp and Index respectively.
178 bool selectBDXAddr(SystemZAddressingMode::AddrForm Form,
179 SystemZAddressingMode::DispRange DR, SDValue Addr,
180 SDValue &Base, SDValue &Disp, SDValue &Index) const;
182 // PC-relative address matching routines used by SystemZOperands.td.
183 bool selectPCRelAddress(SDValue Addr, SDValue &Target) const {
184 if (SystemZISD::isPCREL(Addr.getOpcode())) {
185 Target = Addr.getOperand(0);
191 // BD matching routines used by SystemZOperands.td.
192 bool selectBDAddr12Only(SDValue Addr, SDValue &Base, SDValue &Disp) const {
193 return selectBDAddr(SystemZAddressingMode::Disp12Only, Addr, Base, Disp);
195 bool selectBDAddr12Pair(SDValue Addr, SDValue &Base, SDValue &Disp) const {
196 return selectBDAddr(SystemZAddressingMode::Disp12Pair, Addr, Base, Disp);
198 bool selectBDAddr20Only(SDValue Addr, SDValue &Base, SDValue &Disp) const {
199 return selectBDAddr(SystemZAddressingMode::Disp20Only, Addr, Base, Disp);
201 bool selectBDAddr20Pair(SDValue Addr, SDValue &Base, SDValue &Disp) const {
202 return selectBDAddr(SystemZAddressingMode::Disp20Pair, Addr, Base, Disp);
205 // MVI matching routines used by SystemZOperands.td.
206 bool selectMVIAddr12Pair(SDValue Addr, SDValue &Base, SDValue &Disp) const {
207 return selectMVIAddr(SystemZAddressingMode::Disp12Pair, Addr, Base, Disp);
209 bool selectMVIAddr20Pair(SDValue Addr, SDValue &Base, SDValue &Disp) const {
210 return selectMVIAddr(SystemZAddressingMode::Disp20Pair, Addr, Base, Disp);
213 // BDX matching routines used by SystemZOperands.td.
214 bool selectBDXAddr12Only(SDValue Addr, SDValue &Base, SDValue &Disp,
215 SDValue &Index) const {
216 return selectBDXAddr(SystemZAddressingMode::FormBDXNormal,
217 SystemZAddressingMode::Disp12Only,
218 Addr, Base, Disp, Index);
220 bool selectBDXAddr12Pair(SDValue Addr, SDValue &Base, SDValue &Disp,
221 SDValue &Index) const {
222 return selectBDXAddr(SystemZAddressingMode::FormBDXNormal,
223 SystemZAddressingMode::Disp12Pair,
224 Addr, Base, Disp, Index);
226 bool selectDynAlloc12Only(SDValue Addr, SDValue &Base, SDValue &Disp,
227 SDValue &Index) const {
228 return selectBDXAddr(SystemZAddressingMode::FormBDXDynAlloc,
229 SystemZAddressingMode::Disp12Only,
230 Addr, Base, Disp, Index);
232 bool selectBDXAddr20Only(SDValue Addr, SDValue &Base, SDValue &Disp,
233 SDValue &Index) const {
234 return selectBDXAddr(SystemZAddressingMode::FormBDXNormal,
235 SystemZAddressingMode::Disp20Only,
236 Addr, Base, Disp, Index);
238 bool selectBDXAddr20Only128(SDValue Addr, SDValue &Base, SDValue &Disp,
239 SDValue &Index) const {
240 return selectBDXAddr(SystemZAddressingMode::FormBDXNormal,
241 SystemZAddressingMode::Disp20Only128,
242 Addr, Base, Disp, Index);
244 bool selectBDXAddr20Pair(SDValue Addr, SDValue &Base, SDValue &Disp,
245 SDValue &Index) const {
246 return selectBDXAddr(SystemZAddressingMode::FormBDXNormal,
247 SystemZAddressingMode::Disp20Pair,
248 Addr, Base, Disp, Index);
250 bool selectLAAddr12Pair(SDValue Addr, SDValue &Base, SDValue &Disp,
251 SDValue &Index) const {
252 return selectBDXAddr(SystemZAddressingMode::FormBDXLA,
253 SystemZAddressingMode::Disp12Pair,
254 Addr, Base, Disp, Index);
256 bool selectLAAddr20Pair(SDValue Addr, SDValue &Base, SDValue &Disp,
257 SDValue &Index) const {
258 return selectBDXAddr(SystemZAddressingMode::FormBDXLA,
259 SystemZAddressingMode::Disp20Pair,
260 Addr, Base, Disp, Index);
263 // Try to match Addr as an address with a base, 12-bit displacement
264 // and index, where the index is element Elem of a vector.
265 // Return true on success, storing the base, displacement and vector
266 // in Base, Disp and Index respectively.
267 bool selectBDVAddr12Only(SDValue Addr, SDValue Elem, SDValue &Base,
268 SDValue &Disp, SDValue &Index) const;
270 // Check whether (or Op (and X InsertMask)) is effectively an insertion
271 // of X into bits InsertMask of some Y != Op. Return true if so and
273 bool detectOrAndInsertion(SDValue &Op, uint64_t InsertMask) const;
275 // Try to update RxSBG so that only the bits of RxSBG.Input in Mask are used.
276 // Return true on success.
277 bool refineRxSBGMask(RxSBGOperands &RxSBG, uint64_t Mask) const;
279 // Try to fold some of RxSBG.Input into other fields of RxSBG.
280 // Return true on success.
281 bool expandRxSBG(RxSBGOperands &RxSBG) const;
283 // Return an undefined value of type VT.
284 SDValue getUNDEF(const SDLoc &DL, EVT VT) const;
286 // Convert N to VT, if it isn't already.
287 SDValue convertTo(const SDLoc &DL, EVT VT, SDValue N) const;
289 // Try to implement AND or shift node N using RISBG with the zero flag set.
290 // Return the selected node on success, otherwise return null.
291 bool tryRISBGZero(SDNode *N);
293 // Try to use RISBG or Opcode to implement OR or XOR node N.
294 // Return the selected node on success, otherwise return null.
295 bool tryRxSBG(SDNode *N, unsigned Opcode);
297 // If Op0 is null, then Node is a constant that can be loaded using:
299 // (Opcode UpperVal LowerVal)
301 // If Op0 is nonnull, then Node can be implemented using:
303 // (Opcode (Opcode Op0 UpperVal) LowerVal)
304 void splitLargeImmediate(unsigned Opcode, SDNode *Node, SDValue Op0,
305 uint64_t UpperVal, uint64_t LowerVal);
307 // Try to use gather instruction Opcode to implement vector insertion N.
308 bool tryGather(SDNode *N, unsigned Opcode);
310 // Try to use scatter instruction Opcode to implement store Store.
311 bool tryScatter(StoreSDNode *Store, unsigned Opcode);
313 // Return true if Load and Store are loads and stores of the same size
314 // and are guaranteed not to overlap. Such operations can be implemented
315 // using block (SS-format) instructions.
317 // Partial overlap would lead to incorrect code, since the block operations
318 // are logically bytewise, even though they have a fast path for the
319 // non-overlapping case. We also need to avoid full overlap (i.e. two
320 // addresses that might be equal at run time) because although that case
321 // would be handled correctly, it might be implemented by millicode.
322 bool canUseBlockOperation(StoreSDNode *Store, LoadSDNode *Load) const;
324 // N is a (store (load Y), X) pattern. Return true if it can use an MVC
326 bool storeLoadCanUseMVC(SDNode *N) const;
328 // N is a (store (op (load A[0]), (load A[1])), X) pattern. Return true
329 // if A[1 - I] == X and if N can use a block operation like NC from A[I]
331 bool storeLoadCanUseBlockBinary(SDNode *N, unsigned I) const;
334 SystemZDAGToDAGISel(SystemZTargetMachine &TM, CodeGenOpt::Level OptLevel)
335 : SelectionDAGISel(TM, OptLevel) {}
337 bool runOnMachineFunction(MachineFunction &MF) override {
338 Subtarget = &MF.getSubtarget<SystemZSubtarget>();
339 return SelectionDAGISel::runOnMachineFunction(MF);
342 // Override MachineFunctionPass.
343 StringRef getPassName() const override {
344 return "SystemZ DAG->DAG Pattern Instruction Selection";
347 // Override SelectionDAGISel.
348 void Select(SDNode *Node) override;
349 bool SelectInlineAsmMemoryOperand(const SDValue &Op, unsigned ConstraintID,
350 std::vector<SDValue> &OutOps) override;
352 // Include the pieces autogenerated from the target description.
353 #include "SystemZGenDAGISel.inc"
355 } // end anonymous namespace
357 FunctionPass *llvm::createSystemZISelDag(SystemZTargetMachine &TM,
358 CodeGenOpt::Level OptLevel) {
359 return new SystemZDAGToDAGISel(TM, OptLevel);
362 // Return true if Val should be selected as a displacement for an address
363 // with range DR. Here we're interested in the range of both the instruction
364 // described by DR and of any pairing instruction.
365 static bool selectDisp(SystemZAddressingMode::DispRange DR, int64_t Val) {
367 case SystemZAddressingMode::Disp12Only:
368 return isUInt<12>(Val);
370 case SystemZAddressingMode::Disp12Pair:
371 case SystemZAddressingMode::Disp20Only:
372 case SystemZAddressingMode::Disp20Pair:
373 return isInt<20>(Val);
375 case SystemZAddressingMode::Disp20Only128:
376 return isInt<20>(Val) && isInt<20>(Val + 8);
378 llvm_unreachable("Unhandled displacement range");
381 // Change the base or index in AM to Value, where IsBase selects
382 // between the base and index.
383 static void changeComponent(SystemZAddressingMode &AM, bool IsBase,
391 // The base or index of AM is equivalent to Value + ADJDYNALLOC,
392 // where IsBase selects between the base and index. Try to fold the
393 // ADJDYNALLOC into AM.
394 static bool expandAdjDynAlloc(SystemZAddressingMode &AM, bool IsBase,
396 if (AM.isDynAlloc() && !AM.IncludesDynAlloc) {
397 changeComponent(AM, IsBase, Value);
398 AM.IncludesDynAlloc = true;
404 // The base of AM is equivalent to Base + Index. Try to use Index as
405 // the index register.
406 static bool expandIndex(SystemZAddressingMode &AM, SDValue Base,
408 if (AM.hasIndexField() && !AM.Index.getNode()) {
416 // The base or index of AM is equivalent to Op0 + Op1, where IsBase selects
417 // between the base and index. Try to fold Op1 into AM's displacement.
418 static bool expandDisp(SystemZAddressingMode &AM, bool IsBase,
419 SDValue Op0, uint64_t Op1) {
420 // First try adjusting the displacement.
421 int64_t TestDisp = AM.Disp + Op1;
422 if (selectDisp(AM.DR, TestDisp)) {
423 changeComponent(AM, IsBase, Op0);
428 // We could consider forcing the displacement into a register and
429 // using it as an index, but it would need to be carefully tuned.
433 bool SystemZDAGToDAGISel::expandAddress(SystemZAddressingMode &AM,
435 SDValue N = IsBase ? AM.Base : AM.Index;
436 unsigned Opcode = N.getOpcode();
437 if (Opcode == ISD::TRUNCATE) {
439 Opcode = N.getOpcode();
441 if (Opcode == ISD::ADD || CurDAG->isBaseWithConstantOffset(N)) {
442 SDValue Op0 = N.getOperand(0);
443 SDValue Op1 = N.getOperand(1);
445 unsigned Op0Code = Op0->getOpcode();
446 unsigned Op1Code = Op1->getOpcode();
448 if (Op0Code == SystemZISD::ADJDYNALLOC)
449 return expandAdjDynAlloc(AM, IsBase, Op1);
450 if (Op1Code == SystemZISD::ADJDYNALLOC)
451 return expandAdjDynAlloc(AM, IsBase, Op0);
453 if (Op0Code == ISD::Constant)
454 return expandDisp(AM, IsBase, Op1,
455 cast<ConstantSDNode>(Op0)->getSExtValue());
456 if (Op1Code == ISD::Constant)
457 return expandDisp(AM, IsBase, Op0,
458 cast<ConstantSDNode>(Op1)->getSExtValue());
460 if (IsBase && expandIndex(AM, Op0, Op1))
463 if (Opcode == SystemZISD::PCREL_OFFSET) {
464 SDValue Full = N.getOperand(0);
465 SDValue Base = N.getOperand(1);
466 SDValue Anchor = Base.getOperand(0);
467 uint64_t Offset = (cast<GlobalAddressSDNode>(Full)->getOffset() -
468 cast<GlobalAddressSDNode>(Anchor)->getOffset());
469 return expandDisp(AM, IsBase, Base, Offset);
474 // Return true if an instruction with displacement range DR should be
475 // used for displacement value Val. selectDisp(DR, Val) must already hold.
476 static bool isValidDisp(SystemZAddressingMode::DispRange DR, int64_t Val) {
477 assert(selectDisp(DR, Val) && "Invalid displacement");
479 case SystemZAddressingMode::Disp12Only:
480 case SystemZAddressingMode::Disp20Only:
481 case SystemZAddressingMode::Disp20Only128:
484 case SystemZAddressingMode::Disp12Pair:
485 // Use the other instruction if the displacement is too large.
486 return isUInt<12>(Val);
488 case SystemZAddressingMode::Disp20Pair:
489 // Use the other instruction if the displacement is small enough.
490 return !isUInt<12>(Val);
492 llvm_unreachable("Unhandled displacement range");
495 // Return true if Base + Disp + Index should be performed by LA(Y).
496 static bool shouldUseLA(SDNode *Base, int64_t Disp, SDNode *Index) {
497 // Don't use LA(Y) for constants.
501 // Always use LA(Y) for frame addresses, since we know that the destination
502 // register is almost always (perhaps always) going to be different from
503 // the frame register.
504 if (Base->getOpcode() == ISD::FrameIndex)
508 // Always use LA(Y) if there is a base, displacement and index.
512 // Always use LA if the displacement is small enough. It should always
513 // be no worse than AGHI (and better if it avoids a move).
514 if (isUInt<12>(Disp))
517 // For similar reasons, always use LAY if the constant is too big for AGHI.
518 // LAY should be no worse than AGFI.
519 if (!isInt<16>(Disp))
522 // Don't use LA for plain registers.
526 // Don't use LA for plain addition if the index operand is only used
527 // once. It should be a natural two-operand addition in that case.
528 if (Index->hasOneUse())
531 // Prefer addition if the second operation is sign-extended, in the
532 // hope of using AGF.
533 unsigned IndexOpcode = Index->getOpcode();
534 if (IndexOpcode == ISD::SIGN_EXTEND ||
535 IndexOpcode == ISD::SIGN_EXTEND_INREG)
539 // Don't use LA for two-operand addition if either operand is only
540 // used once. The addition instructions are better in that case.
541 if (Base->hasOneUse())
547 // Return true if Addr is suitable for AM, updating AM if so.
548 bool SystemZDAGToDAGISel::selectAddress(SDValue Addr,
549 SystemZAddressingMode &AM) const {
550 // Start out assuming that the address will need to be loaded separately,
551 // then try to extend it as much as we can.
554 // First try treating the address as a constant.
555 if (Addr.getOpcode() == ISD::Constant &&
556 expandDisp(AM, true, SDValue(),
557 cast<ConstantSDNode>(Addr)->getSExtValue()))
559 // Also see if it's a bare ADJDYNALLOC.
560 else if (Addr.getOpcode() == SystemZISD::ADJDYNALLOC &&
561 expandAdjDynAlloc(AM, true, SDValue()))
564 // Otherwise try expanding each component.
565 while (expandAddress(AM, true) ||
566 (AM.Index.getNode() && expandAddress(AM, false)))
569 // Reject cases where it isn't profitable to use LA(Y).
570 if (AM.Form == SystemZAddressingMode::FormBDXLA &&
571 !shouldUseLA(AM.Base.getNode(), AM.Disp, AM.Index.getNode()))
574 // Reject cases where the other instruction in a pair should be used.
575 if (!isValidDisp(AM.DR, AM.Disp))
578 // Make sure that ADJDYNALLOC is included where necessary.
579 if (AM.isDynAlloc() && !AM.IncludesDynAlloc)
586 // Insert a node into the DAG at least before Pos. This will reposition
587 // the node as needed, and will assign it a node ID that is <= Pos's ID.
588 // Note that this does *not* preserve the uniqueness of node IDs!
589 // The selection DAG must no longer depend on their uniqueness when this
591 static void insertDAGNode(SelectionDAG *DAG, SDNode *Pos, SDValue N) {
592 if (N.getNode()->getNodeId() == -1 ||
593 N.getNode()->getNodeId() > Pos->getNodeId()) {
594 DAG->RepositionNode(Pos->getIterator(), N.getNode());
595 N.getNode()->setNodeId(Pos->getNodeId());
599 void SystemZDAGToDAGISel::getAddressOperands(const SystemZAddressingMode &AM,
600 EVT VT, SDValue &Base,
601 SDValue &Disp) const {
604 // Register 0 means "no base". This is mostly useful for shifts.
605 Base = CurDAG->getRegister(0, VT);
606 else if (Base.getOpcode() == ISD::FrameIndex) {
607 // Lower a FrameIndex to a TargetFrameIndex.
608 int64_t FrameIndex = cast<FrameIndexSDNode>(Base)->getIndex();
609 Base = CurDAG->getTargetFrameIndex(FrameIndex, VT);
610 } else if (Base.getValueType() != VT) {
611 // Truncate values from i64 to i32, for shifts.
612 assert(VT == MVT::i32 && Base.getValueType() == MVT::i64 &&
613 "Unexpected truncation");
615 SDValue Trunc = CurDAG->getNode(ISD::TRUNCATE, DL, VT, Base);
616 insertDAGNode(CurDAG, Base.getNode(), Trunc);
620 // Lower the displacement to a TargetConstant.
621 Disp = CurDAG->getTargetConstant(AM.Disp, SDLoc(Base), VT);
624 void SystemZDAGToDAGISel::getAddressOperands(const SystemZAddressingMode &AM,
625 EVT VT, SDValue &Base,
627 SDValue &Index) const {
628 getAddressOperands(AM, VT, Base, Disp);
631 if (!Index.getNode())
632 // Register 0 means "no index".
633 Index = CurDAG->getRegister(0, VT);
636 bool SystemZDAGToDAGISel::selectBDAddr(SystemZAddressingMode::DispRange DR,
637 SDValue Addr, SDValue &Base,
638 SDValue &Disp) const {
639 SystemZAddressingMode AM(SystemZAddressingMode::FormBD, DR);
640 if (!selectAddress(Addr, AM))
643 getAddressOperands(AM, Addr.getValueType(), Base, Disp);
647 bool SystemZDAGToDAGISel::selectMVIAddr(SystemZAddressingMode::DispRange DR,
648 SDValue Addr, SDValue &Base,
649 SDValue &Disp) const {
650 SystemZAddressingMode AM(SystemZAddressingMode::FormBDXNormal, DR);
651 if (!selectAddress(Addr, AM) || AM.Index.getNode())
654 getAddressOperands(AM, Addr.getValueType(), Base, Disp);
658 bool SystemZDAGToDAGISel::selectBDXAddr(SystemZAddressingMode::AddrForm Form,
659 SystemZAddressingMode::DispRange DR,
660 SDValue Addr, SDValue &Base,
661 SDValue &Disp, SDValue &Index) const {
662 SystemZAddressingMode AM(Form, DR);
663 if (!selectAddress(Addr, AM))
666 getAddressOperands(AM, Addr.getValueType(), Base, Disp, Index);
670 bool SystemZDAGToDAGISel::selectBDVAddr12Only(SDValue Addr, SDValue Elem,
673 SDValue &Index) const {
675 if (selectBDXAddr12Only(Addr, Regs[0], Disp, Regs[1]) &&
676 Regs[0].getNode() && Regs[1].getNode()) {
677 for (unsigned int I = 0; I < 2; ++I) {
680 // We can't tell here whether the index vector has the right type
681 // for the access; the caller needs to do that instead.
682 if (Index.getOpcode() == ISD::ZERO_EXTEND)
683 Index = Index.getOperand(0);
684 if (Index.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
685 Index.getOperand(1) == Elem) {
686 Index = Index.getOperand(0);
694 bool SystemZDAGToDAGISel::detectOrAndInsertion(SDValue &Op,
695 uint64_t InsertMask) const {
696 // We're only interested in cases where the insertion is into some operand
697 // of Op, rather than into Op itself. The only useful case is an AND.
698 if (Op.getOpcode() != ISD::AND)
701 // We need a constant mask.
702 auto *MaskNode = dyn_cast<ConstantSDNode>(Op.getOperand(1).getNode());
706 // It's not an insertion of Op.getOperand(0) if the two masks overlap.
707 uint64_t AndMask = MaskNode->getZExtValue();
708 if (InsertMask & AndMask)
711 // It's only an insertion if all bits are covered or are known to be zero.
712 // The inner check covers all cases but is more expensive.
713 uint64_t Used = allOnes(Op.getValueSizeInBits());
714 if (Used != (AndMask | InsertMask)) {
716 CurDAG->computeKnownBits(Op.getOperand(0), Known);
717 if (Used != (AndMask | InsertMask | Known.Zero.getZExtValue()))
721 Op = Op.getOperand(0);
725 bool SystemZDAGToDAGISel::refineRxSBGMask(RxSBGOperands &RxSBG,
726 uint64_t Mask) const {
727 const SystemZInstrInfo *TII = getInstrInfo();
728 if (RxSBG.Rotate != 0)
729 Mask = (Mask << RxSBG.Rotate) | (Mask >> (64 - RxSBG.Rotate));
731 if (TII->isRxSBGMask(Mask, RxSBG.BitSize, RxSBG.Start, RxSBG.End)) {
738 // Return true if any bits of (RxSBG.Input & Mask) are significant.
739 static bool maskMatters(RxSBGOperands &RxSBG, uint64_t Mask) {
740 // Rotate the mask in the same way as RxSBG.Input is rotated.
741 if (RxSBG.Rotate != 0)
742 Mask = ((Mask << RxSBG.Rotate) | (Mask >> (64 - RxSBG.Rotate)));
743 return (Mask & RxSBG.Mask) != 0;
746 bool SystemZDAGToDAGISel::expandRxSBG(RxSBGOperands &RxSBG) const {
747 SDValue N = RxSBG.Input;
748 unsigned Opcode = N.getOpcode();
750 case ISD::TRUNCATE: {
751 if (RxSBG.Opcode == SystemZ::RNSBG)
753 uint64_t BitSize = N.getValueSizeInBits();
754 uint64_t Mask = allOnes(BitSize);
755 if (!refineRxSBGMask(RxSBG, Mask))
757 RxSBG.Input = N.getOperand(0);
761 if (RxSBG.Opcode == SystemZ::RNSBG)
764 auto *MaskNode = dyn_cast<ConstantSDNode>(N.getOperand(1).getNode());
768 SDValue Input = N.getOperand(0);
769 uint64_t Mask = MaskNode->getZExtValue();
770 if (!refineRxSBGMask(RxSBG, Mask)) {
771 // If some bits of Input are already known zeros, those bits will have
772 // been removed from the mask. See if adding them back in makes the
775 CurDAG->computeKnownBits(Input, Known);
776 Mask |= Known.Zero.getZExtValue();
777 if (!refineRxSBGMask(RxSBG, Mask))
785 if (RxSBG.Opcode != SystemZ::RNSBG)
788 auto *MaskNode = dyn_cast<ConstantSDNode>(N.getOperand(1).getNode());
792 SDValue Input = N.getOperand(0);
793 uint64_t Mask = ~MaskNode->getZExtValue();
794 if (!refineRxSBGMask(RxSBG, Mask)) {
795 // If some bits of Input are already known ones, those bits will have
796 // been removed from the mask. See if adding them back in makes the
799 CurDAG->computeKnownBits(Input, Known);
800 Mask &= ~Known.One.getZExtValue();
801 if (!refineRxSBGMask(RxSBG, Mask))
809 // Any 64-bit rotate left can be merged into the RxSBG.
810 if (RxSBG.BitSize != 64 || N.getValueType() != MVT::i64)
812 auto *CountNode = dyn_cast<ConstantSDNode>(N.getOperand(1).getNode());
816 RxSBG.Rotate = (RxSBG.Rotate + CountNode->getZExtValue()) & 63;
817 RxSBG.Input = N.getOperand(0);
821 case ISD::ANY_EXTEND:
822 // Bits above the extended operand are don't-care.
823 RxSBG.Input = N.getOperand(0);
826 case ISD::ZERO_EXTEND:
827 if (RxSBG.Opcode != SystemZ::RNSBG) {
828 // Restrict the mask to the extended operand.
829 unsigned InnerBitSize = N.getOperand(0).getValueSizeInBits();
830 if (!refineRxSBGMask(RxSBG, allOnes(InnerBitSize)))
833 RxSBG.Input = N.getOperand(0);
838 case ISD::SIGN_EXTEND: {
839 // Check that the extension bits are don't-care (i.e. are masked out
840 // by the final mask).
841 unsigned InnerBitSize = N.getOperand(0).getValueSizeInBits();
842 if (maskMatters(RxSBG, allOnes(RxSBG.BitSize) - allOnes(InnerBitSize)))
845 RxSBG.Input = N.getOperand(0);
850 auto *CountNode = dyn_cast<ConstantSDNode>(N.getOperand(1).getNode());
854 uint64_t Count = CountNode->getZExtValue();
855 unsigned BitSize = N.getValueSizeInBits();
856 if (Count < 1 || Count >= BitSize)
859 if (RxSBG.Opcode == SystemZ::RNSBG) {
860 // Treat (shl X, count) as (rotl X, size-count) as long as the bottom
861 // count bits from RxSBG.Input are ignored.
862 if (maskMatters(RxSBG, allOnes(Count)))
865 // Treat (shl X, count) as (and (rotl X, count), ~0<<count).
866 if (!refineRxSBGMask(RxSBG, allOnes(BitSize - Count) << Count))
870 RxSBG.Rotate = (RxSBG.Rotate + Count) & 63;
871 RxSBG.Input = N.getOperand(0);
877 auto *CountNode = dyn_cast<ConstantSDNode>(N.getOperand(1).getNode());
881 uint64_t Count = CountNode->getZExtValue();
882 unsigned BitSize = N.getValueSizeInBits();
883 if (Count < 1 || Count >= BitSize)
886 if (RxSBG.Opcode == SystemZ::RNSBG || Opcode == ISD::SRA) {
887 // Treat (srl|sra X, count) as (rotl X, size-count) as long as the top
888 // count bits from RxSBG.Input are ignored.
889 if (maskMatters(RxSBG, allOnes(Count) << (BitSize - Count)))
892 // Treat (srl X, count), mask) as (and (rotl X, size-count), ~0>>count),
893 // which is similar to SLL above.
894 if (!refineRxSBGMask(RxSBG, allOnes(BitSize - Count)))
898 RxSBG.Rotate = (RxSBG.Rotate - Count) & 63;
899 RxSBG.Input = N.getOperand(0);
907 SDValue SystemZDAGToDAGISel::getUNDEF(const SDLoc &DL, EVT VT) const {
908 SDNode *N = CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF, DL, VT);
909 return SDValue(N, 0);
912 SDValue SystemZDAGToDAGISel::convertTo(const SDLoc &DL, EVT VT,
914 if (N.getValueType() == MVT::i32 && VT == MVT::i64)
915 return CurDAG->getTargetInsertSubreg(SystemZ::subreg_l32,
916 DL, VT, getUNDEF(DL, MVT::i64), N);
917 if (N.getValueType() == MVT::i64 && VT == MVT::i32)
918 return CurDAG->getTargetExtractSubreg(SystemZ::subreg_l32, DL, VT, N);
919 assert(N.getValueType() == VT && "Unexpected value types");
923 bool SystemZDAGToDAGISel::tryRISBGZero(SDNode *N) {
925 EVT VT = N->getValueType(0);
926 if (!VT.isInteger() || VT.getSizeInBits() > 64)
928 RxSBGOperands RISBG(SystemZ::RISBG, SDValue(N, 0));
930 while (expandRxSBG(RISBG))
931 // The widening or narrowing is expected to be free.
932 // Counting widening or narrowing as a saved operation will result in
933 // preferring an R*SBG over a simple shift/logical instruction.
934 if (RISBG.Input.getOpcode() != ISD::ANY_EXTEND &&
935 RISBG.Input.getOpcode() != ISD::TRUNCATE)
940 // Prefer to use normal shift instructions over RISBG, since they can handle
941 // all cases and are sometimes shorter.
942 if (Count == 1 && N->getOpcode() != ISD::AND)
945 // Prefer register extensions like LLC over RISBG. Also prefer to start
946 // out with normal ANDs if one instruction would be enough. We can convert
947 // these ANDs into an RISBG later if a three-address instruction is useful.
948 if (RISBG.Rotate == 0) {
949 bool PreferAnd = false;
950 // Prefer AND for any 32-bit and-immediate operation.
953 // As well as for any 64-bit operation that can be implemented via LLC(R),
954 // LLH(R), LLGT(R), or one of the and-immediate instructions.
955 else if (RISBG.Mask == 0xff ||
956 RISBG.Mask == 0xffff ||
957 RISBG.Mask == 0x7fffffff ||
958 SystemZ::isImmLF(~RISBG.Mask) ||
959 SystemZ::isImmHF(~RISBG.Mask))
961 // And likewise for the LLZRGF instruction, which doesn't have a register
962 // to register version.
963 else if (auto *Load = dyn_cast<LoadSDNode>(RISBG.Input)) {
964 if (Load->getMemoryVT() == MVT::i32 &&
965 (Load->getExtensionType() == ISD::EXTLOAD ||
966 Load->getExtensionType() == ISD::ZEXTLOAD) &&
967 RISBG.Mask == 0xffffff00 &&
968 Subtarget->hasLoadAndZeroRightmostByte())
972 // Replace the current node with an AND. Note that the current node
973 // might already be that same AND, in which case it is already CSE'd
974 // with it, and we must not call ReplaceNode.
975 SDValue In = convertTo(DL, VT, RISBG.Input);
976 SDValue Mask = CurDAG->getConstant(RISBG.Mask, DL, VT);
977 SDValue New = CurDAG->getNode(ISD::AND, DL, VT, In, Mask);
978 if (N != New.getNode()) {
979 insertDAGNode(CurDAG, N, Mask);
980 insertDAGNode(CurDAG, N, New);
981 ReplaceNode(N, New.getNode());
984 // Now, select the machine opcode to implement this operation.
990 unsigned Opcode = SystemZ::RISBG;
991 // Prefer RISBGN if available, since it does not clobber CC.
992 if (Subtarget->hasMiscellaneousExtensions())
993 Opcode = SystemZ::RISBGN;
994 EVT OpcodeVT = MVT::i64;
995 if (VT == MVT::i32 && Subtarget->hasHighWord()) {
996 Opcode = SystemZ::RISBMux;
1002 getUNDEF(DL, OpcodeVT),
1003 convertTo(DL, OpcodeVT, RISBG.Input),
1004 CurDAG->getTargetConstant(RISBG.Start, DL, MVT::i32),
1005 CurDAG->getTargetConstant(RISBG.End | 128, DL, MVT::i32),
1006 CurDAG->getTargetConstant(RISBG.Rotate, DL, MVT::i32)
1008 SDValue New = convertTo(
1009 DL, VT, SDValue(CurDAG->getMachineNode(Opcode, DL, OpcodeVT, Ops), 0));
1010 ReplaceUses(N, New.getNode());
1011 CurDAG->RemoveDeadNode(N);
1015 bool SystemZDAGToDAGISel::tryRxSBG(SDNode *N, unsigned Opcode) {
1017 EVT VT = N->getValueType(0);
1018 if (!VT.isInteger() || VT.getSizeInBits() > 64)
1020 // Try treating each operand of N as the second operand of the RxSBG
1021 // and see which goes deepest.
1022 RxSBGOperands RxSBG[] = {
1023 RxSBGOperands(Opcode, N->getOperand(0)),
1024 RxSBGOperands(Opcode, N->getOperand(1))
1026 unsigned Count[] = { 0, 0 };
1027 for (unsigned I = 0; I < 2; ++I)
1028 while (expandRxSBG(RxSBG[I]))
1029 // The widening or narrowing is expected to be free.
1030 // Counting widening or narrowing as a saved operation will result in
1031 // preferring an R*SBG over a simple shift/logical instruction.
1032 if (RxSBG[I].Input.getOpcode() != ISD::ANY_EXTEND &&
1033 RxSBG[I].Input.getOpcode() != ISD::TRUNCATE)
1036 // Do nothing if neither operand is suitable.
1037 if (Count[0] == 0 && Count[1] == 0)
1040 // Pick the deepest second operand.
1041 unsigned I = Count[0] > Count[1] ? 0 : 1;
1042 SDValue Op0 = N->getOperand(I ^ 1);
1044 // Prefer IC for character insertions from memory.
1045 if (Opcode == SystemZ::ROSBG && (RxSBG[I].Mask & 0xff) == 0)
1046 if (auto *Load = dyn_cast<LoadSDNode>(Op0.getNode()))
1047 if (Load->getMemoryVT() == MVT::i8)
1050 // See whether we can avoid an AND in the first operand by converting
1052 if (Opcode == SystemZ::ROSBG && detectOrAndInsertion(Op0, RxSBG[I].Mask)) {
1053 Opcode = SystemZ::RISBG;
1054 // Prefer RISBGN if available, since it does not clobber CC.
1055 if (Subtarget->hasMiscellaneousExtensions())
1056 Opcode = SystemZ::RISBGN;
1060 convertTo(DL, MVT::i64, Op0),
1061 convertTo(DL, MVT::i64, RxSBG[I].Input),
1062 CurDAG->getTargetConstant(RxSBG[I].Start, DL, MVT::i32),
1063 CurDAG->getTargetConstant(RxSBG[I].End, DL, MVT::i32),
1064 CurDAG->getTargetConstant(RxSBG[I].Rotate, DL, MVT::i32)
1066 SDValue New = convertTo(
1067 DL, VT, SDValue(CurDAG->getMachineNode(Opcode, DL, MVT::i64, Ops), 0));
1068 ReplaceNode(N, New.getNode());
1072 void SystemZDAGToDAGISel::splitLargeImmediate(unsigned Opcode, SDNode *Node,
1073 SDValue Op0, uint64_t UpperVal,
1074 uint64_t LowerVal) {
1075 EVT VT = Node->getValueType(0);
1077 SDValue Upper = CurDAG->getConstant(UpperVal, DL, VT);
1079 Upper = CurDAG->getNode(Opcode, DL, VT, Op0, Upper);
1082 // When we haven't passed in Op0, Upper will be a constant. In order to
1083 // prevent folding back to the large immediate in `Or = getNode(...)` we run
1084 // SelectCode first and end up with an opaque machine node. This means that
1085 // we need to use a handle to keep track of Upper in case it gets CSE'd by
1088 // Note that in the case where Op0 is passed in we could just call
1089 // SelectCode(Upper) later, along with the SelectCode(Or), and avoid needing
1090 // the handle at all, but it's fine to do it here.
1092 // TODO: This is a pretty hacky way to do this. Can we do something that
1093 // doesn't require a two paragraph explanation?
1094 HandleSDNode Handle(Upper);
1095 SelectCode(Upper.getNode());
1096 Upper = Handle.getValue();
1099 SDValue Lower = CurDAG->getConstant(LowerVal, DL, VT);
1100 SDValue Or = CurDAG->getNode(Opcode, DL, VT, Upper, Lower);
1102 ReplaceUses(Node, Or.getNode());
1103 CurDAG->RemoveDeadNode(Node);
1105 SelectCode(Or.getNode());
1108 bool SystemZDAGToDAGISel::tryGather(SDNode *N, unsigned Opcode) {
1109 SDValue ElemV = N->getOperand(2);
1110 auto *ElemN = dyn_cast<ConstantSDNode>(ElemV);
1114 unsigned Elem = ElemN->getZExtValue();
1115 EVT VT = N->getValueType(0);
1116 if (Elem >= VT.getVectorNumElements())
1119 auto *Load = dyn_cast<LoadSDNode>(N->getOperand(1));
1120 if (!Load || !Load->hasOneUse())
1122 if (Load->getMemoryVT().getSizeInBits() !=
1123 Load->getValueType(0).getSizeInBits())
1126 SDValue Base, Disp, Index;
1127 if (!selectBDVAddr12Only(Load->getBasePtr(), ElemV, Base, Disp, Index) ||
1128 Index.getValueType() != VT.changeVectorElementTypeToInteger())
1133 N->getOperand(0), Base, Disp, Index,
1134 CurDAG->getTargetConstant(Elem, DL, MVT::i32), Load->getChain()
1136 SDNode *Res = CurDAG->getMachineNode(Opcode, DL, VT, MVT::Other, Ops);
1137 ReplaceUses(SDValue(Load, 1), SDValue(Res, 1));
1138 ReplaceNode(N, Res);
1142 bool SystemZDAGToDAGISel::tryScatter(StoreSDNode *Store, unsigned Opcode) {
1143 SDValue Value = Store->getValue();
1144 if (Value.getOpcode() != ISD::EXTRACT_VECTOR_ELT)
1146 if (Store->getMemoryVT().getSizeInBits() != Value.getValueSizeInBits())
1149 SDValue ElemV = Value.getOperand(1);
1150 auto *ElemN = dyn_cast<ConstantSDNode>(ElemV);
1154 SDValue Vec = Value.getOperand(0);
1155 EVT VT = Vec.getValueType();
1156 unsigned Elem = ElemN->getZExtValue();
1157 if (Elem >= VT.getVectorNumElements())
1160 SDValue Base, Disp, Index;
1161 if (!selectBDVAddr12Only(Store->getBasePtr(), ElemV, Base, Disp, Index) ||
1162 Index.getValueType() != VT.changeVectorElementTypeToInteger())
1167 Vec, Base, Disp, Index, CurDAG->getTargetConstant(Elem, DL, MVT::i32),
1170 ReplaceNode(Store, CurDAG->getMachineNode(Opcode, DL, MVT::Other, Ops));
1174 bool SystemZDAGToDAGISel::canUseBlockOperation(StoreSDNode *Store,
1175 LoadSDNode *Load) const {
1176 // Check that the two memory operands have the same size.
1177 if (Load->getMemoryVT() != Store->getMemoryVT())
1180 // Volatility stops an access from being decomposed.
1181 if (Load->isVolatile() || Store->isVolatile())
1184 // There's no chance of overlap if the load is invariant.
1185 if (Load->isInvariant() && Load->isDereferenceable())
1188 // Otherwise we need to check whether there's an alias.
1189 const Value *V1 = Load->getMemOperand()->getValue();
1190 const Value *V2 = Store->getMemOperand()->getValue();
1195 uint64_t Size = Load->getMemoryVT().getStoreSize();
1196 int64_t End1 = Load->getSrcValueOffset() + Size;
1197 int64_t End2 = Store->getSrcValueOffset() + Size;
1198 if (V1 == V2 && End1 == End2)
1201 return !AA->alias(MemoryLocation(V1, End1, Load->getAAInfo()),
1202 MemoryLocation(V2, End2, Store->getAAInfo()));
1205 bool SystemZDAGToDAGISel::storeLoadCanUseMVC(SDNode *N) const {
1206 auto *Store = cast<StoreSDNode>(N);
1207 auto *Load = cast<LoadSDNode>(Store->getValue());
1209 // Prefer not to use MVC if either address can use ... RELATIVE LONG
1211 uint64_t Size = Load->getMemoryVT().getStoreSize();
1212 if (Size > 1 && Size <= 8) {
1213 // Prefer LHRL, LRL and LGRL.
1214 if (SystemZISD::isPCREL(Load->getBasePtr().getOpcode()))
1216 // Prefer STHRL, STRL and STGRL.
1217 if (SystemZISD::isPCREL(Store->getBasePtr().getOpcode()))
1221 return canUseBlockOperation(Store, Load);
1224 bool SystemZDAGToDAGISel::storeLoadCanUseBlockBinary(SDNode *N,
1226 auto *StoreA = cast<StoreSDNode>(N);
1227 auto *LoadA = cast<LoadSDNode>(StoreA->getValue().getOperand(1 - I));
1228 auto *LoadB = cast<LoadSDNode>(StoreA->getValue().getOperand(I));
1229 return !LoadA->isVolatile() && canUseBlockOperation(StoreA, LoadB);
1232 void SystemZDAGToDAGISel::Select(SDNode *Node) {
1233 // Dump information about the Node being selected
1234 DEBUG(errs() << "Selecting: "; Node->dump(CurDAG); errs() << "\n");
1236 // If we have a custom node, we already have selected!
1237 if (Node->isMachineOpcode()) {
1238 DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n");
1239 Node->setNodeId(-1);
1243 unsigned Opcode = Node->getOpcode();
1246 if (Node->getOperand(1).getOpcode() != ISD::Constant)
1247 if (tryRxSBG(Node, SystemZ::ROSBG))
1252 if (Node->getOperand(1).getOpcode() != ISD::Constant)
1253 if (tryRxSBG(Node, SystemZ::RXSBG))
1257 // If this is a 64-bit operation in which both 32-bit halves are nonzero,
1258 // split the operation into two.
1259 if (Node->getValueType(0) == MVT::i64)
1260 if (auto *Op1 = dyn_cast<ConstantSDNode>(Node->getOperand(1))) {
1261 uint64_t Val = Op1->getZExtValue();
1262 if (!SystemZ::isImmLF(Val) && !SystemZ::isImmHF(Val)) {
1263 splitLargeImmediate(Opcode, Node, Node->getOperand(0),
1264 Val - uint32_t(Val), uint32_t(Val));
1271 if (Node->getOperand(1).getOpcode() != ISD::Constant)
1272 if (tryRxSBG(Node, SystemZ::RNSBG))
1278 case ISD::ZERO_EXTEND:
1279 if (tryRISBGZero(Node))
1284 // If this is a 64-bit constant that is out of the range of LLILF,
1285 // LLIHF and LGFI, split it into two 32-bit pieces.
1286 if (Node->getValueType(0) == MVT::i64) {
1287 uint64_t Val = cast<ConstantSDNode>(Node)->getZExtValue();
1288 if (!SystemZ::isImmLF(Val) && !SystemZ::isImmHF(Val) && !isInt<32>(Val)) {
1289 splitLargeImmediate(ISD::OR, Node, SDValue(), Val - uint32_t(Val),
1296 case SystemZISD::SELECT_CCMASK: {
1297 SDValue Op0 = Node->getOperand(0);
1298 SDValue Op1 = Node->getOperand(1);
1299 // Prefer to put any load first, so that it can be matched as a
1300 // conditional load. Likewise for constants in range for LOCHI.
1301 if ((Op1.getOpcode() == ISD::LOAD && Op0.getOpcode() != ISD::LOAD) ||
1302 (Subtarget->hasLoadStoreOnCond2() &&
1303 Node->getValueType(0).isInteger() &&
1304 Op1.getOpcode() == ISD::Constant &&
1305 isInt<16>(cast<ConstantSDNode>(Op1)->getSExtValue()) &&
1306 !(Op0.getOpcode() == ISD::Constant &&
1307 isInt<16>(cast<ConstantSDNode>(Op0)->getSExtValue())))) {
1308 SDValue CCValid = Node->getOperand(2);
1309 SDValue CCMask = Node->getOperand(3);
1310 uint64_t ConstCCValid =
1311 cast<ConstantSDNode>(CCValid.getNode())->getZExtValue();
1312 uint64_t ConstCCMask =
1313 cast<ConstantSDNode>(CCMask.getNode())->getZExtValue();
1314 // Invert the condition.
1315 CCMask = CurDAG->getConstant(ConstCCValid ^ ConstCCMask, SDLoc(Node),
1316 CCMask.getValueType());
1317 SDValue Op4 = Node->getOperand(4);
1318 Node = CurDAG->UpdateNodeOperands(Node, Op1, Op0, CCValid, CCMask, Op4);
1323 case ISD::INSERT_VECTOR_ELT: {
1324 EVT VT = Node->getValueType(0);
1325 unsigned ElemBitSize = VT.getScalarSizeInBits();
1326 if (ElemBitSize == 32) {
1327 if (tryGather(Node, SystemZ::VGEF))
1329 } else if (ElemBitSize == 64) {
1330 if (tryGather(Node, SystemZ::VGEG))
1337 auto *Store = cast<StoreSDNode>(Node);
1338 unsigned ElemBitSize = Store->getValue().getValueSizeInBits();
1339 if (ElemBitSize == 32) {
1340 if (tryScatter(Store, SystemZ::VSCEF))
1342 } else if (ElemBitSize == 64) {
1343 if (tryScatter(Store, SystemZ::VSCEG))
1353 bool SystemZDAGToDAGISel::
1354 SelectInlineAsmMemoryOperand(const SDValue &Op,
1355 unsigned ConstraintID,
1356 std::vector<SDValue> &OutOps) {
1357 SystemZAddressingMode::AddrForm Form;
1358 SystemZAddressingMode::DispRange DispRange;
1359 SDValue Base, Disp, Index;
1361 switch(ConstraintID) {
1363 llvm_unreachable("Unexpected asm memory constraint");
1364 case InlineAsm::Constraint_i:
1365 case InlineAsm::Constraint_Q:
1366 // Accept an address with a short displacement, but no index.
1367 Form = SystemZAddressingMode::FormBD;
1368 DispRange = SystemZAddressingMode::Disp12Only;
1370 case InlineAsm::Constraint_R:
1371 // Accept an address with a short displacement and an index.
1372 Form = SystemZAddressingMode::FormBDXNormal;
1373 DispRange = SystemZAddressingMode::Disp12Only;
1375 case InlineAsm::Constraint_S:
1376 // Accept an address with a long displacement, but no index.
1377 Form = SystemZAddressingMode::FormBD;
1378 DispRange = SystemZAddressingMode::Disp20Only;
1380 case InlineAsm::Constraint_T:
1381 case InlineAsm::Constraint_m:
1382 // Accept an address with a long displacement and an index.
1383 // m works the same as T, as this is the most general case.
1384 Form = SystemZAddressingMode::FormBDXNormal;
1385 DispRange = SystemZAddressingMode::Disp20Only;
1389 if (selectBDXAddr(Form, DispRange, Op, Base, Disp, Index)) {
1390 const TargetRegisterClass *TRC =
1391 Subtarget->getRegisterInfo()->getPointerRegClass(*MF);
1393 SDValue RC = CurDAG->getTargetConstant(TRC->getID(), DL, MVT::i32);
1395 // Make sure that the base address doesn't go into %r0.
1396 // If it's a TargetFrameIndex or a fixed register, we shouldn't do anything.
1397 if (Base.getOpcode() != ISD::TargetFrameIndex &&
1398 Base.getOpcode() != ISD::Register) {
1400 SDValue(CurDAG->getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
1401 DL, Base.getValueType(),
1405 // Make sure that the index register isn't assigned to %r0 either.
1406 if (Index.getOpcode() != ISD::Register) {
1408 SDValue(CurDAG->getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
1409 DL, Index.getValueType(),
1413 OutOps.push_back(Base);
1414 OutOps.push_back(Disp);
1415 OutOps.push_back(Index);