1 //===-- HexagonISelLowering.cpp - Hexagon DAG Lowering Implementation -----===//
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 implements the interfaces that Hexagon uses to lower LLVM code
11 // into a selection DAG.
13 //===----------------------------------------------------------------------===//
15 #include "HexagonISelLowering.h"
16 #include "HexagonTargetMachine.h"
17 #include "HexagonMachineFunctionInfo.h"
18 #include "HexagonTargetObjectFile.h"
19 #include "HexagonSubtarget.h"
20 #include "llvm/DerivedTypes.h"
21 #include "llvm/Function.h"
22 #include "llvm/InlineAsm.h"
23 #include "llvm/GlobalVariable.h"
24 #include "llvm/GlobalAlias.h"
25 #include "llvm/Intrinsics.h"
26 #include "llvm/CallingConv.h"
27 #include "llvm/CodeGen/CallingConvLower.h"
28 #include "llvm/CodeGen/MachineFrameInfo.h"
29 #include "llvm/CodeGen/MachineFunction.h"
30 #include "llvm/CodeGen/MachineInstrBuilder.h"
31 #include "llvm/CodeGen/MachineJumpTableInfo.h"
32 #include "llvm/CodeGen/MachineRegisterInfo.h"
33 #include "llvm/CodeGen/SelectionDAGISel.h"
34 #include "llvm/CodeGen/ValueTypes.h"
35 #include "llvm/Support/Debug.h"
36 #include "llvm/Support/ErrorHandling.h"
37 #include "llvm/Support/CommandLine.h"
40 const unsigned Hexagon_MAX_RET_SIZE = 64;
43 EmitJumpTables("hexagon-emit-jump-tables", cl::init(true), cl::Hidden,
44 cl::desc("Control jump table emission on Hexagon target"));
46 int NumNamedVarArgParams = -1;
48 // Implement calling convention for Hexagon.
50 CC_Hexagon(unsigned ValNo, MVT ValVT,
51 MVT LocVT, CCValAssign::LocInfo LocInfo,
52 ISD::ArgFlagsTy ArgFlags, CCState &State);
55 CC_Hexagon32(unsigned ValNo, MVT ValVT,
56 MVT LocVT, CCValAssign::LocInfo LocInfo,
57 ISD::ArgFlagsTy ArgFlags, CCState &State);
60 CC_Hexagon64(unsigned ValNo, MVT ValVT,
61 MVT LocVT, CCValAssign::LocInfo LocInfo,
62 ISD::ArgFlagsTy ArgFlags, CCState &State);
65 RetCC_Hexagon(unsigned ValNo, MVT ValVT,
66 MVT LocVT, CCValAssign::LocInfo LocInfo,
67 ISD::ArgFlagsTy ArgFlags, CCState &State);
70 RetCC_Hexagon32(unsigned ValNo, MVT ValVT,
71 MVT LocVT, CCValAssign::LocInfo LocInfo,
72 ISD::ArgFlagsTy ArgFlags, CCState &State);
75 RetCC_Hexagon64(unsigned ValNo, MVT ValVT,
76 MVT LocVT, CCValAssign::LocInfo LocInfo,
77 ISD::ArgFlagsTy ArgFlags, CCState &State);
80 CC_Hexagon_VarArg (unsigned ValNo, MVT ValVT,
81 MVT LocVT, CCValAssign::LocInfo LocInfo,
82 ISD::ArgFlagsTy ArgFlags, CCState &State) {
84 // NumNamedVarArgParams can not be zero for a VarArg function.
85 assert ( (NumNamedVarArgParams > 0) &&
86 "NumNamedVarArgParams is not bigger than zero.");
88 if ( (int)ValNo < NumNamedVarArgParams ) {
89 // Deal with named arguments.
90 return CC_Hexagon(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State);
93 // Deal with un-named arguments.
95 if (ArgFlags.isByVal()) {
96 // If pass-by-value, the size allocated on stack is decided
97 // by ArgFlags.getByValSize(), not by the size of LocVT.
98 assert ((ArgFlags.getByValSize() > 8) &&
99 "ByValSize must be bigger than 8 bytes");
100 ofst = State.AllocateStack(ArgFlags.getByValSize(), 4);
101 State.addLoc(CCValAssign::getMem(ValNo, ValVT, ofst, LocVT, LocInfo));
104 if (LocVT == MVT::i32) {
105 ofst = State.AllocateStack(4, 4);
106 State.addLoc(CCValAssign::getMem(ValNo, ValVT, ofst, LocVT, LocInfo));
109 if (LocVT == MVT::i64) {
110 ofst = State.AllocateStack(8, 8);
111 State.addLoc(CCValAssign::getMem(ValNo, ValVT, ofst, LocVT, LocInfo));
119 CC_Hexagon (unsigned ValNo, MVT ValVT,
120 MVT LocVT, CCValAssign::LocInfo LocInfo,
121 ISD::ArgFlagsTy ArgFlags, CCState &State) {
123 if (ArgFlags.isByVal()) {
125 assert ((ArgFlags.getByValSize() > 8) &&
126 "ByValSize must be bigger than 8 bytes");
127 unsigned Offset = State.AllocateStack(ArgFlags.getByValSize(), 4);
128 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
132 if (LocVT == MVT::i1 || LocVT == MVT::i8 || LocVT == MVT::i16) {
135 if (ArgFlags.isSExt())
136 LocInfo = CCValAssign::SExt;
137 else if (ArgFlags.isZExt())
138 LocInfo = CCValAssign::ZExt;
140 LocInfo = CCValAssign::AExt;
143 if (LocVT == MVT::i32) {
144 if (!CC_Hexagon32(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))
148 if (LocVT == MVT::i64) {
149 if (!CC_Hexagon64(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))
153 return true; // CC didn't match.
157 static bool CC_Hexagon32(unsigned ValNo, MVT ValVT,
158 MVT LocVT, CCValAssign::LocInfo LocInfo,
159 ISD::ArgFlagsTy ArgFlags, CCState &State) {
161 static const uint16_t RegList[] = {
162 Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3, Hexagon::R4,
165 if (unsigned Reg = State.AllocateReg(RegList, 6)) {
166 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
170 unsigned Offset = State.AllocateStack(4, 4);
171 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
175 static bool CC_Hexagon64(unsigned ValNo, MVT ValVT,
176 MVT LocVT, CCValAssign::LocInfo LocInfo,
177 ISD::ArgFlagsTy ArgFlags, CCState &State) {
179 if (unsigned Reg = State.AllocateReg(Hexagon::D0)) {
180 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
184 static const uint16_t RegList1[] = {
185 Hexagon::D1, Hexagon::D2
187 static const uint16_t RegList2[] = {
188 Hexagon::R1, Hexagon::R3
190 if (unsigned Reg = State.AllocateReg(RegList1, RegList2, 2)) {
191 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
195 unsigned Offset = State.AllocateStack(8, 8, Hexagon::D2);
196 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
200 static bool RetCC_Hexagon(unsigned ValNo, MVT ValVT,
201 MVT LocVT, CCValAssign::LocInfo LocInfo,
202 ISD::ArgFlagsTy ArgFlags, CCState &State) {
205 if (LocVT == MVT::i1 ||
210 if (ArgFlags.isSExt())
211 LocInfo = CCValAssign::SExt;
212 else if (ArgFlags.isZExt())
213 LocInfo = CCValAssign::ZExt;
215 LocInfo = CCValAssign::AExt;
218 if (LocVT == MVT::i32) {
219 if (!RetCC_Hexagon32(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))
223 if (LocVT == MVT::i64) {
224 if (!RetCC_Hexagon64(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))
228 return true; // CC didn't match.
231 static bool RetCC_Hexagon32(unsigned ValNo, MVT ValVT,
232 MVT LocVT, CCValAssign::LocInfo LocInfo,
233 ISD::ArgFlagsTy ArgFlags, CCState &State) {
235 if (LocVT == MVT::i32) {
236 if (unsigned Reg = State.AllocateReg(Hexagon::R0)) {
237 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
242 unsigned Offset = State.AllocateStack(4, 4);
243 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
247 static bool RetCC_Hexagon64(unsigned ValNo, MVT ValVT,
248 MVT LocVT, CCValAssign::LocInfo LocInfo,
249 ISD::ArgFlagsTy ArgFlags, CCState &State) {
250 if (LocVT == MVT::i64) {
251 if (unsigned Reg = State.AllocateReg(Hexagon::D0)) {
252 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
257 unsigned Offset = State.AllocateStack(8, 8);
258 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
263 HexagonTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG)
268 /// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
269 /// by "Src" to address "Dst" of size "Size". Alignment information is
270 /// specified by the specific parameter attribute. The copy will be passed as
271 /// a byval function parameter. Sometimes what we are copying is the end of a
272 /// larger object, the part that does not fit in registers.
274 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
275 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
278 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32);
279 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
280 /*isVolatile=*/false, /*AlwaysInline=*/false,
281 MachinePointerInfo(), MachinePointerInfo());
285 // LowerReturn - Lower ISD::RET. If a struct is larger than 8 bytes and is
286 // passed by value, the function prototype is modified to return void and
287 // the value is stored in memory pointed by a pointer passed by caller.
289 HexagonTargetLowering::LowerReturn(SDValue Chain,
290 CallingConv::ID CallConv, bool isVarArg,
291 const SmallVectorImpl<ISD::OutputArg> &Outs,
292 const SmallVectorImpl<SDValue> &OutVals,
293 DebugLoc dl, SelectionDAG &DAG) const {
295 // CCValAssign - represent the assignment of the return value to locations.
296 SmallVector<CCValAssign, 16> RVLocs;
298 // CCState - Info about the registers and stack slot.
299 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
300 getTargetMachine(), RVLocs, *DAG.getContext());
302 // Analyze return values of ISD::RET
303 CCInfo.AnalyzeReturn(Outs, RetCC_Hexagon);
305 // If this is the first return lowered for this function, add the regs to the
306 // liveout set for the function.
307 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
308 for (unsigned i = 0; i != RVLocs.size(); ++i)
309 if (RVLocs[i].isRegLoc())
310 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
314 // Copy the result values into the output registers.
315 for (unsigned i = 0; i != RVLocs.size(); ++i) {
316 CCValAssign &VA = RVLocs[i];
318 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), OutVals[i], Flag);
320 // Guarantee that all emitted copies are stuck together with flags.
321 Flag = Chain.getValue(1);
325 return DAG.getNode(HexagonISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
327 return DAG.getNode(HexagonISD::RET_FLAG, dl, MVT::Other, Chain);
333 /// LowerCallResult - Lower the result values of an ISD::CALL into the
334 /// appropriate copies out of appropriate physical registers. This assumes that
335 /// Chain/InFlag are the input chain/flag to use, and that TheCall is the call
336 /// being lowered. Returns a SDNode with the same number of values as the
339 HexagonTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
340 CallingConv::ID CallConv, bool isVarArg,
342 SmallVectorImpl<ISD::InputArg> &Ins,
343 DebugLoc dl, SelectionDAG &DAG,
344 SmallVectorImpl<SDValue> &InVals,
345 const SmallVectorImpl<SDValue> &OutVals,
346 SDValue Callee) const {
348 // Assign locations to each value returned by this call.
349 SmallVector<CCValAssign, 16> RVLocs;
351 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
352 getTargetMachine(), RVLocs, *DAG.getContext());
354 CCInfo.AnalyzeCallResult(Ins, RetCC_Hexagon);
356 // Copy all of the result registers out of their specified physreg.
357 for (unsigned i = 0; i != RVLocs.size(); ++i) {
358 Chain = DAG.getCopyFromReg(Chain, dl,
359 RVLocs[i].getLocReg(),
360 RVLocs[i].getValVT(), InFlag).getValue(1);
361 InFlag = Chain.getValue(2);
362 InVals.push_back(Chain.getValue(0));
368 /// LowerCall - Functions arguments are copied from virtual regs to
369 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
371 HexagonTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
372 CallingConv::ID CallConv, bool isVarArg,
373 bool doesNotRet, bool &isTailCall,
374 const SmallVectorImpl<ISD::OutputArg> &Outs,
375 const SmallVectorImpl<SDValue> &OutVals,
376 const SmallVectorImpl<ISD::InputArg> &Ins,
377 DebugLoc dl, SelectionDAG &DAG,
378 SmallVectorImpl<SDValue> &InVals) const {
380 bool IsStructRet = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
382 // Analyze operands of the call, assigning locations to each operand.
383 SmallVector<CCValAssign, 16> ArgLocs;
384 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
385 getTargetMachine(), ArgLocs, *DAG.getContext());
387 // Check for varargs.
388 NumNamedVarArgParams = -1;
389 if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Callee))
391 const Function* CalleeFn = NULL;
392 Callee = DAG.getTargetGlobalAddress(GA->getGlobal(), dl, MVT::i32);
393 if ((CalleeFn = dyn_cast<Function>(GA->getGlobal())))
395 // If a function has zero args and is a vararg function, that's
396 // disallowed so it must be an undeclared function. Do not assume
397 // varargs if the callee is undefined.
398 if (CalleeFn->isVarArg() &&
399 CalleeFn->getFunctionType()->getNumParams() != 0) {
400 NumNamedVarArgParams = CalleeFn->getFunctionType()->getNumParams();
405 if (NumNamedVarArgParams > 0)
406 CCInfo.AnalyzeCallOperands(Outs, CC_Hexagon_VarArg);
408 CCInfo.AnalyzeCallOperands(Outs, CC_Hexagon);
412 bool StructAttrFlag =
413 DAG.getMachineFunction().getFunction()->hasStructRetAttr();
414 isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,
415 isVarArg, IsStructRet,
417 Outs, OutVals, Ins, DAG);
418 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i){
419 CCValAssign &VA = ArgLocs[i];
426 DEBUG(dbgs () << "Eligible for Tail Call\n");
429 "Argument must be passed on stack. Not eligible for Tail Call\n");
432 // Get a count of how many bytes are to be pushed on the stack.
433 unsigned NumBytes = CCInfo.getNextStackOffset();
434 SmallVector<std::pair<unsigned, SDValue>, 16> RegsToPass;
435 SmallVector<SDValue, 8> MemOpChains;
438 DAG.getCopyFromReg(Chain, dl, TM.getRegisterInfo()->getStackRegister(),
441 // Walk the register/memloc assignments, inserting copies/loads.
442 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
443 CCValAssign &VA = ArgLocs[i];
444 SDValue Arg = OutVals[i];
445 ISD::ArgFlagsTy Flags = Outs[i].Flags;
447 // Promote the value if needed.
448 switch (VA.getLocInfo()) {
450 // Loc info must be one of Full, SExt, ZExt, or AExt.
451 llvm_unreachable("Unknown loc info!");
452 case CCValAssign::Full:
454 case CCValAssign::SExt:
455 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
457 case CCValAssign::ZExt:
458 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
460 case CCValAssign::AExt:
461 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
466 unsigned LocMemOffset = VA.getLocMemOffset();
467 SDValue PtrOff = DAG.getConstant(LocMemOffset, StackPtr.getValueType());
468 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff);
470 if (Flags.isByVal()) {
471 // The argument is a struct passed by value. According to LLVM, "Arg"
473 MemOpChains.push_back(CreateCopyOfByValArgument(Arg, PtrOff, Chain,
476 // The argument is not passed by value. "Arg" is a buildin type. It is
478 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
479 MachinePointerInfo(),false, false,
485 // Arguments that can be passed on register must be kept at RegsToPass
488 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
492 // Transform all store nodes into one single node because all store
493 // nodes are independent of each other.
494 if (!MemOpChains.empty()) {
495 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &MemOpChains[0],
500 Chain = DAG.getCALLSEQ_START(Chain, DAG.getConstant(NumBytes,
501 getPointerTy(), true));
503 // Build a sequence of copy-to-reg nodes chained together with token
504 // chain and flag operands which copy the outgoing args into registers.
505 // The InFlag in necessary since all emited instructions must be
509 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
510 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
511 RegsToPass[i].second, InFlag);
512 InFlag = Chain.getValue(1);
516 // For tail calls lower the arguments to the 'real' stack slot.
518 // Force all the incoming stack arguments to be loaded from the stack
519 // before any new outgoing arguments are stored to the stack, because the
520 // outgoing stack slots may alias the incoming argument stack slots, and
521 // the alias isn't otherwise explicit. This is slightly more conservative
522 // than necessary, because it means that each store effectively depends
523 // on every argument instead of just those arguments it would clobber.
525 // Do not flag preceeding copytoreg stuff together with the following stuff.
527 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
528 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
529 RegsToPass[i].second, InFlag);
530 InFlag = Chain.getValue(1);
535 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
536 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
537 // node so that legalize doesn't hack it.
538 if (flag_aligned_memcpy) {
539 const char *MemcpyName =
540 "__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes";
542 DAG.getTargetExternalSymbol(MemcpyName, getPointerTy());
543 flag_aligned_memcpy = false;
544 } else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
545 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, getPointerTy());
546 } else if (ExternalSymbolSDNode *S =
547 dyn_cast<ExternalSymbolSDNode>(Callee)) {
548 Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy());
551 // Returns a chain & a flag for retval copy to use.
552 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
553 SmallVector<SDValue, 8> Ops;
554 Ops.push_back(Chain);
555 Ops.push_back(Callee);
557 // Add argument registers to the end of the list so that they are
558 // known live into the call.
559 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
560 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
561 RegsToPass[i].second.getValueType()));
564 if (InFlag.getNode()) {
565 Ops.push_back(InFlag);
569 return DAG.getNode(HexagonISD::TC_RETURN, dl, NodeTys, &Ops[0], Ops.size());
571 Chain = DAG.getNode(HexagonISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
572 InFlag = Chain.getValue(1);
574 // Create the CALLSEQ_END node.
575 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
576 DAG.getIntPtrConstant(0, true), InFlag);
577 InFlag = Chain.getValue(1);
579 // Handle result values, copying them out of physregs into vregs that we
581 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl, DAG,
582 InVals, OutVals, Callee);
585 static bool getIndexedAddressParts(SDNode *Ptr, EVT VT,
586 bool isSEXTLoad, SDValue &Base,
587 SDValue &Offset, bool &isInc,
589 if (Ptr->getOpcode() != ISD::ADD)
592 if (VT == MVT::i64 || VT == MVT::i32 || VT == MVT::i16 || VT == MVT::i8) {
593 isInc = (Ptr->getOpcode() == ISD::ADD);
594 Base = Ptr->getOperand(0);
595 Offset = Ptr->getOperand(1);
596 // Ensure that Offset is a constant.
597 return (isa<ConstantSDNode>(Offset));
603 // TODO: Put this function along with the other isS* functions in
604 // HexagonISelDAGToDAG.cpp into a common file. Or better still, use the
605 // functions defined in HexagonImmediates.td.
606 static bool Is_PostInc_S4_Offset(SDNode * S, int ShiftAmount) {
607 ConstantSDNode *N = cast<ConstantSDNode>(S);
609 // immS4 predicate - True if the immediate fits in a 4-bit sign extended.
611 int64_t v = (int64_t)N->getSExtValue();
613 if (ShiftAmount > 0) {
615 v = v >> ShiftAmount;
617 return (v <= 7) && (v >= -8) && (m == 0);
620 /// getPostIndexedAddressParts - returns true by value, base pointer and
621 /// offset pointer and addressing mode by reference if this node can be
622 /// combined with a load / store to form a post-indexed load / store.
623 bool HexagonTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
626 ISD::MemIndexedMode &AM,
627 SelectionDAG &DAG) const
631 bool isSEXTLoad = false;
633 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
634 VT = LD->getMemoryVT();
635 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
636 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
637 VT = ST->getMemoryVT();
638 if (ST->getValue().getValueType() == MVT::i64 && ST->isTruncatingStore()) {
646 bool isLegal = getIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
648 // ShiftAmount = number of left-shifted bits in the Hexagon instruction.
649 int ShiftAmount = VT.getSizeInBits() / 16;
650 if (isLegal && Is_PostInc_S4_Offset(Offset.getNode(), ShiftAmount)) {
651 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
658 SDValue HexagonTargetLowering::LowerINLINEASM(SDValue Op,
659 SelectionDAG &DAG) const {
660 SDNode *Node = Op.getNode();
661 MachineFunction &MF = DAG.getMachineFunction();
662 HexagonMachineFunctionInfo *FuncInfo =
663 MF.getInfo<HexagonMachineFunctionInfo>();
664 switch (Node->getOpcode()) {
665 case ISD::INLINEASM: {
666 unsigned NumOps = Node->getNumOperands();
667 if (Node->getOperand(NumOps-1).getValueType() == MVT::Glue)
668 --NumOps; // Ignore the flag operand.
670 for (unsigned i = InlineAsm::Op_FirstOperand; i != NumOps;) {
671 if (FuncInfo->hasClobberLR())
674 cast<ConstantSDNode>(Node->getOperand(i))->getZExtValue();
675 unsigned NumVals = InlineAsm::getNumOperandRegisters(Flags);
676 ++i; // Skip the ID value.
678 switch (InlineAsm::getKind(Flags)) {
679 default: llvm_unreachable("Bad flags!");
680 case InlineAsm::Kind_RegDef:
681 case InlineAsm::Kind_RegUse:
682 case InlineAsm::Kind_Imm:
683 case InlineAsm::Kind_Clobber:
684 case InlineAsm::Kind_Mem: {
685 for (; NumVals; --NumVals, ++i) {}
688 case InlineAsm::Kind_RegDefEarlyClobber: {
689 for (; NumVals; --NumVals, ++i) {
691 cast<RegisterSDNode>(Node->getOperand(i))->getReg();
694 if (Reg == TM.getRegisterInfo()->getRARegister()) {
695 FuncInfo->setHasClobberLR(true);
710 // Taken from the XCore backend.
712 SDValue HexagonTargetLowering::
713 LowerBR_JT(SDValue Op, SelectionDAG &DAG) const
715 SDValue Chain = Op.getOperand(0);
716 SDValue Table = Op.getOperand(1);
717 SDValue Index = Op.getOperand(2);
718 DebugLoc dl = Op.getDebugLoc();
719 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
720 unsigned JTI = JT->getIndex();
721 MachineFunction &MF = DAG.getMachineFunction();
722 const MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
723 SDValue TargetJT = DAG.getTargetJumpTable(JT->getIndex(), MVT::i32);
725 // Mark all jump table targets as address taken.
726 const std::vector<MachineJumpTableEntry> &JTE = MJTI->getJumpTables();
727 const std::vector<MachineBasicBlock*> &JTBBs = JTE[JTI].MBBs;
728 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
729 MachineBasicBlock *MBB = JTBBs[i];
730 MBB->setHasAddressTaken();
731 // This line is needed to set the hasAddressTaken flag on the BasicBlock
733 BlockAddress::get(const_cast<BasicBlock *>(MBB->getBasicBlock()));
736 SDValue JumpTableBase = DAG.getNode(HexagonISD::WrapperJT, dl,
737 getPointerTy(), TargetJT);
738 SDValue ShiftIndex = DAG.getNode(ISD::SHL, dl, MVT::i32, Index,
739 DAG.getConstant(2, MVT::i32));
740 SDValue JTAddress = DAG.getNode(ISD::ADD, dl, MVT::i32, JumpTableBase,
742 SDValue LoadTarget = DAG.getLoad(MVT::i32, dl, Chain, JTAddress,
743 MachinePointerInfo(), false, false, false,
745 return DAG.getNode(HexagonISD::BR_JT, dl, MVT::Other, Chain, LoadTarget);
750 HexagonTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
751 SelectionDAG &DAG) const {
752 SDValue Chain = Op.getOperand(0);
753 SDValue Size = Op.getOperand(1);
754 DebugLoc dl = Op.getDebugLoc();
756 unsigned SPReg = getStackPointerRegisterToSaveRestore();
758 // Get a reference to the stack pointer.
759 SDValue StackPointer = DAG.getCopyFromReg(Chain, dl, SPReg, MVT::i32);
761 // Subtract the dynamic size from the actual stack size to
762 // obtain the new stack size.
763 SDValue Sub = DAG.getNode(ISD::SUB, dl, MVT::i32, StackPointer, Size);
766 // For Hexagon, the outgoing memory arguments area should be on top of the
767 // alloca area on the stack i.e., the outgoing memory arguments should be
768 // at a lower address than the alloca area. Move the alloca area down the
769 // stack by adding back the space reserved for outgoing arguments to SP
772 // We do not know what the size of the outgoing args is at this point.
773 // So, we add a pseudo instruction ADJDYNALLOC that will adjust the
774 // stack pointer. We patch this instruction with the correct, known
775 // offset in emitPrologue().
777 // Use a placeholder immediate (zero) for now. This will be patched up
778 // by emitPrologue().
779 SDValue ArgAdjust = DAG.getNode(HexagonISD::ADJDYNALLOC, dl,
782 DAG.getConstant(0, MVT::i32));
784 // The Sub result contains the new stack start address, so it
785 // must be placed in the stack pointer register.
786 SDValue CopyChain = DAG.getCopyToReg(Chain, dl,
787 TM.getRegisterInfo()->getStackRegister(),
790 SDValue Ops[2] = { ArgAdjust, CopyChain };
791 return DAG.getMergeValues(Ops, 2, dl);
795 HexagonTargetLowering::LowerFormalArguments(SDValue Chain,
796 CallingConv::ID CallConv,
799 SmallVectorImpl<ISD::InputArg> &Ins,
800 DebugLoc dl, SelectionDAG &DAG,
801 SmallVectorImpl<SDValue> &InVals)
804 MachineFunction &MF = DAG.getMachineFunction();
805 MachineFrameInfo *MFI = MF.getFrameInfo();
806 MachineRegisterInfo &RegInfo = MF.getRegInfo();
807 HexagonMachineFunctionInfo *FuncInfo =
808 MF.getInfo<HexagonMachineFunctionInfo>();
811 // Assign locations to all of the incoming arguments.
812 SmallVector<CCValAssign, 16> ArgLocs;
813 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
814 getTargetMachine(), ArgLocs, *DAG.getContext());
816 CCInfo.AnalyzeFormalArguments(Ins, CC_Hexagon);
818 // For LLVM, in the case when returning a struct by value (>8byte),
819 // the first argument is a pointer that points to the location on caller's
820 // stack where the return value will be stored. For Hexagon, the location on
821 // caller's stack is passed only when the struct size is smaller than (and
822 // equal to) 8 bytes. If not, no address will be passed into callee and
823 // callee return the result direclty through R0/R1.
825 SmallVector<SDValue, 4> MemOps;
827 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
828 CCValAssign &VA = ArgLocs[i];
829 ISD::ArgFlagsTy Flags = Ins[i].Flags;
831 unsigned StackLocation;
834 if ( (VA.isRegLoc() && !Flags.isByVal())
835 || (VA.isRegLoc() && Flags.isByVal() && Flags.getByValSize() > 8)) {
836 // Arguments passed in registers
837 // 1. int, long long, ptr args that get allocated in register.
838 // 2. Large struct that gets an register to put its address in.
839 EVT RegVT = VA.getLocVT();
840 if (RegVT == MVT::i8 || RegVT == MVT::i16 || RegVT == MVT::i32) {
842 RegInfo.createVirtualRegister(&Hexagon::IntRegsRegClass);
843 RegInfo.addLiveIn(VA.getLocReg(), VReg);
844 InVals.push_back(DAG.getCopyFromReg(Chain, dl, VReg, RegVT));
845 } else if (RegVT == MVT::i64) {
847 RegInfo.createVirtualRegister(&Hexagon::DoubleRegsRegClass);
848 RegInfo.addLiveIn(VA.getLocReg(), VReg);
849 InVals.push_back(DAG.getCopyFromReg(Chain, dl, VReg, RegVT));
853 } else if (VA.isRegLoc() && Flags.isByVal() && Flags.getByValSize() <= 8) {
854 assert (0 && "ByValSize must be bigger than 8 bytes");
857 assert(VA.isMemLoc());
859 if (Flags.isByVal()) {
860 // If it's a byval parameter, then we need to compute the
861 // "real" size, not the size of the pointer.
862 ObjSize = Flags.getByValSize();
864 ObjSize = VA.getLocVT().getStoreSizeInBits() >> 3;
867 StackLocation = HEXAGON_LRFP_SIZE + VA.getLocMemOffset();
868 // Create the frame index object for this incoming parameter...
869 FI = MFI->CreateFixedObject(ObjSize, StackLocation, true);
871 // Create the SelectionDAG nodes cordl, responding to a load
872 // from this parameter.
873 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
875 if (Flags.isByVal()) {
876 // If it's a pass-by-value aggregate, then do not dereference the stack
877 // location. Instead, we should generate a reference to the stack
879 InVals.push_back(FIN);
881 InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
882 MachinePointerInfo(), false, false,
889 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &MemOps[0],
893 // This will point to the next argument passed via stack.
894 int FrameIndex = MFI->CreateFixedObject(Hexagon_PointerSize,
896 CCInfo.getNextStackOffset(),
898 FuncInfo->setVarArgsFrameIndex(FrameIndex);
905 HexagonTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
906 // VASTART stores the address of the VarArgsFrameIndex slot into the
907 // memory location argument.
908 MachineFunction &MF = DAG.getMachineFunction();
909 HexagonMachineFunctionInfo *QFI = MF.getInfo<HexagonMachineFunctionInfo>();
910 SDValue Addr = DAG.getFrameIndex(QFI->getVarArgsFrameIndex(), MVT::i32);
911 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
912 return DAG.getStore(Op.getOperand(0), Op.getDebugLoc(), Addr,
913 Op.getOperand(1), MachinePointerInfo(SV), false,
918 HexagonTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
919 SDNode* OpNode = Op.getNode();
921 SDValue Cond = DAG.getNode(ISD::SETCC, Op.getDebugLoc(), MVT::i1,
922 Op.getOperand(2), Op.getOperand(3),
924 return DAG.getNode(ISD::SELECT, Op.getDebugLoc(), OpNode->getValueType(0),
925 Cond, Op.getOperand(0),
930 HexagonTargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const {
931 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
932 MachineFunction &MF = DAG.getMachineFunction();
933 MachineFrameInfo *MFI = MF.getFrameInfo();
934 MFI->setReturnAddressIsTaken(true);
936 EVT VT = Op.getValueType();
937 DebugLoc dl = Op.getDebugLoc();
938 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
940 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
941 SDValue Offset = DAG.getConstant(4, MVT::i32);
942 return DAG.getLoad(VT, dl, DAG.getEntryNode(),
943 DAG.getNode(ISD::ADD, dl, VT, FrameAddr, Offset),
944 MachinePointerInfo(), false, false, false, 0);
947 // Return LR, which contains the return address. Mark it an implicit live-in.
948 unsigned Reg = MF.addLiveIn(TRI->getRARegister(), getRegClassFor(MVT::i32));
949 return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT);
953 HexagonTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
954 const HexagonRegisterInfo *TRI = TM.getRegisterInfo();
955 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
956 MFI->setFrameAddressIsTaken(true);
958 EVT VT = Op.getValueType();
959 DebugLoc dl = Op.getDebugLoc();
960 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
961 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl,
962 TRI->getFrameRegister(), VT);
964 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
965 MachinePointerInfo(),
966 false, false, false, 0);
971 SDValue HexagonTargetLowering::LowerMEMBARRIER(SDValue Op,
972 SelectionDAG& DAG) const {
973 DebugLoc dl = Op.getDebugLoc();
974 return DAG.getNode(HexagonISD::BARRIER, dl, MVT::Other, Op.getOperand(0));
978 SDValue HexagonTargetLowering::LowerATOMIC_FENCE(SDValue Op,
979 SelectionDAG& DAG) const {
980 DebugLoc dl = Op.getDebugLoc();
981 return DAG.getNode(HexagonISD::BARRIER, dl, MVT::Other, Op.getOperand(0));
985 SDValue HexagonTargetLowering::LowerGLOBALADDRESS(SDValue Op,
986 SelectionDAG &DAG) const {
988 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
989 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
990 DebugLoc dl = Op.getDebugLoc();
991 Result = DAG.getTargetGlobalAddress(GV, dl, getPointerTy(), Offset);
993 HexagonTargetObjectFile &TLOF =
994 (HexagonTargetObjectFile&)getObjFileLowering();
995 if (TLOF.IsGlobalInSmallSection(GV, getTargetMachine())) {
996 return DAG.getNode(HexagonISD::CONST32_GP, dl, getPointerTy(), Result);
999 return DAG.getNode(HexagonISD::CONST32, dl, getPointerTy(), Result);
1002 //===----------------------------------------------------------------------===//
1003 // TargetLowering Implementation
1004 //===----------------------------------------------------------------------===//
1006 HexagonTargetLowering::HexagonTargetLowering(HexagonTargetMachine
1008 : TargetLowering(targetmachine, new HexagonTargetObjectFile()),
1011 // Set up the register classes.
1012 addRegisterClass(MVT::i32, &Hexagon::IntRegsRegClass);
1013 addRegisterClass(MVT::i64, &Hexagon::DoubleRegsRegClass);
1015 addRegisterClass(MVT::i1, &Hexagon::PredRegsRegClass);
1017 computeRegisterProperties();
1020 setPrefLoopAlignment(4);
1022 // Limits for inline expansion of memcpy/memmove
1023 maxStoresPerMemcpy = 6;
1024 maxStoresPerMemmove = 6;
1027 // Library calls for unsupported operations
1029 setLibcallName(RTLIB::OGT_F64, "__hexagon_gtdf2");
1031 setLibcallName(RTLIB::SINTTOFP_I64_F64, "__hexagon_floatdidf");
1032 setLibcallName(RTLIB::SINTTOFP_I128_F64, "__hexagon_floattidf");
1033 setLibcallName(RTLIB::SINTTOFP_I128_F32, "__hexagon_floattisf");
1034 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__hexagon_floatunsisf");
1035 setLibcallName(RTLIB::UINTTOFP_I64_F32, "__hexagon_floatundisf");
1036 setLibcallName(RTLIB::SINTTOFP_I64_F32, "__hexagon_floatdisf");
1037 setLibcallName(RTLIB::UINTTOFP_I64_F64, "__hexagon_floatundidf");
1039 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__hexagon_fixunssfsi");
1040 setLibcallName(RTLIB::FPTOUINT_F32_I64, "__hexagon_fixunssfdi");
1041 setLibcallName(RTLIB::FPTOUINT_F32_I128, "__hexagon_fixunssfti");
1043 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__hexagon_fixunsdfsi");
1044 setLibcallName(RTLIB::FPTOUINT_F64_I64, "__hexagon_fixunsdfdi");
1045 setLibcallName(RTLIB::FPTOUINT_F64_I128, "__hexagon_fixunsdfti");
1047 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__hexagon_floatunsidf");
1048 setLibcallName(RTLIB::FPTOSINT_F32_I64, "__hexagon_fixsfdi");
1049 setLibcallName(RTLIB::FPTOSINT_F32_I128, "__hexagon_fixsfti");
1050 setLibcallName(RTLIB::FPTOSINT_F64_I64, "__hexagon_fixdfdi");
1051 setLibcallName(RTLIB::FPTOSINT_F64_I128, "__hexagon_fixdfti");
1053 setLibcallName(RTLIB::OGT_F64, "__hexagon_gtdf2");
1055 setLibcallName(RTLIB::SDIV_I32, "__hexagon_divsi3");
1056 setOperationAction(ISD::SDIV, MVT::i32, Expand);
1057 setLibcallName(RTLIB::SREM_I32, "__hexagon_umodsi3");
1058 setOperationAction(ISD::SREM, MVT::i32, Expand);
1060 setLibcallName(RTLIB::SDIV_I64, "__hexagon_divdi3");
1061 setOperationAction(ISD::SDIV, MVT::i64, Expand);
1062 setLibcallName(RTLIB::SREM_I64, "__hexagon_moddi3");
1063 setOperationAction(ISD::SREM, MVT::i64, Expand);
1065 setLibcallName(RTLIB::UDIV_I32, "__hexagon_udivsi3");
1066 setOperationAction(ISD::UDIV, MVT::i32, Expand);
1068 setLibcallName(RTLIB::UDIV_I64, "__hexagon_udivdi3");
1069 setOperationAction(ISD::UDIV, MVT::i64, Expand);
1071 setLibcallName(RTLIB::UREM_I32, "__hexagon_umodsi3");
1072 setOperationAction(ISD::UREM, MVT::i32, Expand);
1074 setLibcallName(RTLIB::UREM_I64, "__hexagon_umoddi3");
1075 setOperationAction(ISD::UREM, MVT::i64, Expand);
1077 setLibcallName(RTLIB::DIV_F32, "__hexagon_divsf3");
1078 setOperationAction(ISD::FDIV, MVT::f32, Expand);
1080 setLibcallName(RTLIB::DIV_F64, "__hexagon_divdf3");
1081 setOperationAction(ISD::FDIV, MVT::f64, Expand);
1083 setLibcallName(RTLIB::FPEXT_F32_F64, "__hexagon_extendsfdf2");
1084 setOperationAction(ISD::FP_EXTEND, MVT::f32, Expand);
1086 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__hexagon_floatsisf");
1087 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
1089 setLibcallName(RTLIB::ADD_F64, "__hexagon_adddf3");
1090 setOperationAction(ISD::FADD, MVT::f64, Expand);
1092 setLibcallName(RTLIB::ADD_F32, "__hexagon_addsf3");
1093 setOperationAction(ISD::FADD, MVT::f32, Expand);
1095 setLibcallName(RTLIB::ADD_F32, "__hexagon_addsf3");
1096 setOperationAction(ISD::FADD, MVT::f32, Expand);
1098 setLibcallName(RTLIB::OEQ_F32, "__hexagon_eqsf2");
1099 setCondCodeAction(ISD::SETOEQ, MVT::f32, Expand);
1101 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__hexagon_fixdfsi");
1102 setOperationAction(ISD::FP_TO_SINT, MVT::f64, Expand);
1104 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__hexagon_fixsfsi");
1105 setOperationAction(ISD::FP_TO_SINT, MVT::f32, Expand);
1107 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__hexagon_floatsidf");
1108 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
1110 setLibcallName(RTLIB::OGE_F64, "__hexagon_gedf2");
1111 setCondCodeAction(ISD::SETOGE, MVT::f64, Expand);
1113 setLibcallName(RTLIB::OGE_F32, "__hexagon_gesf2");
1114 setCondCodeAction(ISD::SETOGE, MVT::f32, Expand);
1116 setLibcallName(RTLIB::OGT_F32, "__hexagon_gtsf2");
1117 setCondCodeAction(ISD::SETOGT, MVT::f32, Expand);
1119 setLibcallName(RTLIB::OLE_F64, "__hexagon_ledf2");
1120 setCondCodeAction(ISD::SETOLE, MVT::f64, Expand);
1122 setLibcallName(RTLIB::OLE_F32, "__hexagon_lesf2");
1123 setCondCodeAction(ISD::SETOLE, MVT::f32, Expand);
1125 setLibcallName(RTLIB::OLT_F64, "__hexagon_ltdf2");
1126 setCondCodeAction(ISD::SETOLT, MVT::f64, Expand);
1128 setLibcallName(RTLIB::OLT_F32, "__hexagon_ltsf2");
1129 setCondCodeAction(ISD::SETOLT, MVT::f32, Expand);
1131 setLibcallName(RTLIB::SREM_I32, "__hexagon_modsi3");
1132 setOperationAction(ISD::SREM, MVT::i32, Expand);
1134 setLibcallName(RTLIB::MUL_F64, "__hexagon_muldf3");
1135 setOperationAction(ISD::FMUL, MVT::f64, Expand);
1137 setLibcallName(RTLIB::MUL_F32, "__hexagon_mulsf3");
1138 setOperationAction(ISD::MUL, MVT::f32, Expand);
1140 setLibcallName(RTLIB::UNE_F64, "__hexagon_nedf2");
1141 setCondCodeAction(ISD::SETUNE, MVT::f64, Expand);
1143 setLibcallName(RTLIB::UNE_F32, "__hexagon_nesf2");
1146 setLibcallName(RTLIB::SUB_F64, "__hexagon_subdf3");
1147 setOperationAction(ISD::SUB, MVT::f64, Expand);
1149 setLibcallName(RTLIB::SUB_F32, "__hexagon_subsf3");
1150 setOperationAction(ISD::SUB, MVT::f32, Expand);
1152 setLibcallName(RTLIB::FPROUND_F64_F32, "__hexagon_truncdfsf2");
1153 setOperationAction(ISD::FP_ROUND, MVT::f64, Expand);
1155 setLibcallName(RTLIB::UO_F64, "__hexagon_unorddf2");
1156 setCondCodeAction(ISD::SETUO, MVT::f64, Expand);
1158 setLibcallName(RTLIB::O_F64, "__hexagon_unorddf2");
1159 setCondCodeAction(ISD::SETO, MVT::f64, Expand);
1161 setLibcallName(RTLIB::OEQ_F64, "__hexagon_eqdf2");
1162 setCondCodeAction(ISD::SETOEQ, MVT::f64, Expand);
1164 setLibcallName(RTLIB::O_F32, "__hexagon_unordsf2");
1165 setCondCodeAction(ISD::SETO, MVT::f32, Expand);
1167 setLibcallName(RTLIB::UO_F32, "__hexagon_unordsf2");
1168 setCondCodeAction(ISD::SETUO, MVT::f32, Expand);
1170 setIndexedLoadAction(ISD::POST_INC, MVT::i8, Legal);
1171 setIndexedLoadAction(ISD::POST_INC, MVT::i16, Legal);
1172 setIndexedLoadAction(ISD::POST_INC, MVT::i32, Legal);
1173 setIndexedLoadAction(ISD::POST_INC, MVT::i64, Legal);
1175 setIndexedStoreAction(ISD::POST_INC, MVT::i8, Legal);
1176 setIndexedStoreAction(ISD::POST_INC, MVT::i16, Legal);
1177 setIndexedStoreAction(ISD::POST_INC, MVT::i32, Legal);
1178 setIndexedStoreAction(ISD::POST_INC, MVT::i64, Legal);
1180 setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
1182 // Turn FP extload into load/fextend.
1183 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
1184 // Hexagon has a i1 sign extending load.
1185 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Expand);
1186 // Turn FP truncstore into trunc + store.
1187 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
1189 // Custom legalize GlobalAddress nodes into CONST32.
1190 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
1191 setOperationAction(ISD::GlobalAddress, MVT::i8, Custom);
1193 setOperationAction(ISD::TRUNCATE, MVT::i64, Expand);
1195 // Hexagon doesn't have sext_inreg, replace them with shl/sra.
1196 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
1198 // Hexagon has no REM or DIVREM operations.
1199 setOperationAction(ISD::UREM, MVT::i32, Expand);
1200 setOperationAction(ISD::SREM, MVT::i32, Expand);
1201 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
1202 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
1203 setOperationAction(ISD::SREM, MVT::i64, Expand);
1204 setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
1205 setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
1207 setOperationAction(ISD::BSWAP, MVT::i64, Expand);
1209 // Expand fp<->uint.
1210 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
1211 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
1213 // Hexagon has no select or setcc: expand to SELECT_CC.
1214 setOperationAction(ISD::SELECT, MVT::f32, Expand);
1215 setOperationAction(ISD::SELECT, MVT::f64, Expand);
1217 // Lower SELECT_CC to SETCC and SELECT.
1218 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
1219 setOperationAction(ISD::SELECT_CC, MVT::i64, Custom);
1220 // This is a workaround documented in DAGCombiner.cpp:2892 We don't
1221 // support SELECT_CC on every type.
1222 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
1224 setOperationAction(ISD::BR_CC, MVT::Other, Expand);
1225 setOperationAction(ISD::BRIND, MVT::Other, Expand);
1226 if (EmitJumpTables) {
1227 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
1229 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
1232 setOperationAction(ISD::BR_CC, MVT::i32, Expand);
1234 setOperationAction(ISD::MEMBARRIER, MVT::Other, Custom);
1235 setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Custom);
1237 setOperationAction(ISD::FSIN , MVT::f64, Expand);
1238 setOperationAction(ISD::FCOS , MVT::f64, Expand);
1239 setOperationAction(ISD::FREM , MVT::f64, Expand);
1240 setOperationAction(ISD::FSIN , MVT::f32, Expand);
1241 setOperationAction(ISD::FCOS , MVT::f32, Expand);
1242 setOperationAction(ISD::FREM , MVT::f32, Expand);
1243 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
1244 setOperationAction(ISD::CTTZ , MVT::i32, Expand);
1245 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand);
1246 setOperationAction(ISD::CTLZ , MVT::i32, Expand);
1247 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand);
1248 setOperationAction(ISD::ROTL , MVT::i32, Expand);
1249 setOperationAction(ISD::ROTR , MVT::i32, Expand);
1250 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
1251 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
1252 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
1253 setOperationAction(ISD::FPOW , MVT::f64, Expand);
1254 setOperationAction(ISD::FPOW , MVT::f32, Expand);
1256 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
1257 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
1258 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
1260 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
1261 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
1263 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
1264 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
1266 setOperationAction(ISD::EXCEPTIONADDR, MVT::i64, Expand);
1267 setOperationAction(ISD::EHSELECTION, MVT::i64, Expand);
1268 setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
1269 setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
1271 setOperationAction(ISD::EH_RETURN, MVT::Other, Expand);
1273 if (TM.getSubtargetImpl()->isSubtargetV2()) {
1274 setExceptionPointerRegister(Hexagon::R20);
1275 setExceptionSelectorRegister(Hexagon::R21);
1277 setExceptionPointerRegister(Hexagon::R0);
1278 setExceptionSelectorRegister(Hexagon::R1);
1281 // VASTART needs to be custom lowered to use the VarArgsFrameIndex.
1282 setOperationAction(ISD::VASTART , MVT::Other, Custom);
1284 // Use the default implementation.
1285 setOperationAction(ISD::VAARG , MVT::Other, Expand);
1286 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
1287 setOperationAction(ISD::VAEND , MVT::Other, Expand);
1288 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
1289 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
1292 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
1293 setOperationAction(ISD::INLINEASM , MVT::Other, Custom);
1295 setMinFunctionAlignment(2);
1297 // Needed for DYNAMIC_STACKALLOC expansion.
1298 unsigned StackRegister = TM.getRegisterInfo()->getStackRegister();
1299 setStackPointerRegisterToSaveRestore(StackRegister);
1300 setSchedulingPreference(Sched::VLIW);
1305 HexagonTargetLowering::getTargetNodeName(unsigned Opcode) const {
1308 case HexagonISD::CONST32: return "HexagonISD::CONST32";
1309 case HexagonISD::ADJDYNALLOC: return "HexagonISD::ADJDYNALLOC";
1310 case HexagonISD::CMPICC: return "HexagonISD::CMPICC";
1311 case HexagonISD::CMPFCC: return "HexagonISD::CMPFCC";
1312 case HexagonISD::BRICC: return "HexagonISD::BRICC";
1313 case HexagonISD::BRFCC: return "HexagonISD::BRFCC";
1314 case HexagonISD::SELECT_ICC: return "HexagonISD::SELECT_ICC";
1315 case HexagonISD::SELECT_FCC: return "HexagonISD::SELECT_FCC";
1316 case HexagonISD::Hi: return "HexagonISD::Hi";
1317 case HexagonISD::Lo: return "HexagonISD::Lo";
1318 case HexagonISD::FTOI: return "HexagonISD::FTOI";
1319 case HexagonISD::ITOF: return "HexagonISD::ITOF";
1320 case HexagonISD::CALL: return "HexagonISD::CALL";
1321 case HexagonISD::RET_FLAG: return "HexagonISD::RET_FLAG";
1322 case HexagonISD::BR_JT: return "HexagonISD::BR_JT";
1323 case HexagonISD::TC_RETURN: return "HexagonISD::TC_RETURN";
1328 HexagonTargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const {
1329 EVT MTy1 = EVT::getEVT(Ty1);
1330 EVT MTy2 = EVT::getEVT(Ty2);
1331 if (!MTy1.isSimple() || !MTy2.isSimple()) {
1334 return ((MTy1.getSimpleVT() == MVT::i64) && (MTy2.getSimpleVT() == MVT::i32));
1337 bool HexagonTargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
1338 if (!VT1.isSimple() || !VT2.isSimple()) {
1341 return ((VT1.getSimpleVT() == MVT::i64) && (VT2.getSimpleVT() == MVT::i32));
1345 HexagonTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
1346 switch (Op.getOpcode()) {
1347 default: llvm_unreachable("Should not custom lower this!");
1348 // Frame & Return address. Currently unimplemented.
1349 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
1350 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
1351 case ISD::GlobalTLSAddress:
1352 llvm_unreachable("TLS not implemented for Hexagon.");
1353 case ISD::MEMBARRIER: return LowerMEMBARRIER(Op, DAG);
1354 case ISD::ATOMIC_FENCE: return LowerATOMIC_FENCE(Op, DAG);
1355 case ISD::GlobalAddress: return LowerGLOBALADDRESS(Op, DAG);
1356 case ISD::VASTART: return LowerVASTART(Op, DAG);
1357 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
1359 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
1360 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
1361 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
1362 case ISD::INLINEASM: return LowerINLINEASM(Op, DAG);
1369 //===----------------------------------------------------------------------===//
1370 // Hexagon Scheduler Hooks
1371 //===----------------------------------------------------------------------===//
1373 HexagonTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1374 MachineBasicBlock *BB)
1376 switch (MI->getOpcode()) {
1377 case Hexagon::ADJDYNALLOC: {
1378 MachineFunction *MF = BB->getParent();
1379 HexagonMachineFunctionInfo *FuncInfo =
1380 MF->getInfo<HexagonMachineFunctionInfo>();
1381 FuncInfo->addAllocaAdjustInst(MI);
1384 default: llvm_unreachable("Unexpected instr type to insert");
1388 //===----------------------------------------------------------------------===//
1389 // Inline Assembly Support
1390 //===----------------------------------------------------------------------===//
1392 std::pair<unsigned, const TargetRegisterClass*>
1393 HexagonTargetLowering::getRegForInlineAsmConstraint(const
1394 std::string &Constraint,
1396 if (Constraint.size() == 1) {
1397 switch (Constraint[0]) {
1399 switch (VT.getSimpleVT().SimpleTy) {
1401 llvm_unreachable("getRegForInlineAsmConstraint Unhandled data type");
1405 return std::make_pair(0U, &Hexagon::IntRegsRegClass);
1407 return std::make_pair(0U, &Hexagon::DoubleRegsRegClass);
1410 llvm_unreachable("Unknown asm register class");
1414 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
1417 /// isLegalAddressingMode - Return true if the addressing mode represented by
1418 /// AM is legal for this target, for a load/store of the specified type.
1419 bool HexagonTargetLowering::isLegalAddressingMode(const AddrMode &AM,
1421 // Allows a signed-extended 11-bit immediate field.
1422 if (AM.BaseOffs <= -(1LL << 13) || AM.BaseOffs >= (1LL << 13)-1) {
1426 // No global is ever allowed as a base.
1431 int Scale = AM.Scale;
1432 if (Scale < 0) Scale = -Scale;
1434 case 0: // No scale reg, "r+i", "r", or just "i".
1436 default: // No scaled addressing mode.
1442 /// isLegalICmpImmediate - Return true if the specified immediate is legal
1443 /// icmp immediate, that is the target has icmp instructions which can compare
1444 /// a register against the immediate without having to materialize the
1445 /// immediate into a register.
1446 bool HexagonTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
1447 return Imm >= -512 && Imm <= 511;
1450 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
1451 /// for tail call optimization. Targets which want to do tail call
1452 /// optimization should implement this function.
1453 bool HexagonTargetLowering::IsEligibleForTailCallOptimization(
1455 CallingConv::ID CalleeCC,
1457 bool isCalleeStructRet,
1458 bool isCallerStructRet,
1459 const SmallVectorImpl<ISD::OutputArg> &Outs,
1460 const SmallVectorImpl<SDValue> &OutVals,
1461 const SmallVectorImpl<ISD::InputArg> &Ins,
1462 SelectionDAG& DAG) const {
1463 const Function *CallerF = DAG.getMachineFunction().getFunction();
1464 CallingConv::ID CallerCC = CallerF->getCallingConv();
1465 bool CCMatch = CallerCC == CalleeCC;
1467 // ***************************************************************************
1468 // Look for obvious safe cases to perform tail call optimization that do not
1469 // require ABI changes.
1470 // ***************************************************************************
1472 // If this is a tail call via a function pointer, then don't do it!
1473 if (!(dyn_cast<GlobalAddressSDNode>(Callee))
1474 && !(dyn_cast<ExternalSymbolSDNode>(Callee))) {
1478 // Do not optimize if the calling conventions do not match.
1482 // Do not tail call optimize vararg calls.
1486 // Also avoid tail call optimization if either caller or callee uses struct
1487 // return semantics.
1488 if (isCalleeStructRet || isCallerStructRet)
1491 // In addition to the cases above, we also disable Tail Call Optimization if
1492 // the calling convention code that at least one outgoing argument needs to
1493 // go on the stack. We cannot check that here because at this point that
1494 // information is not available.