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 "HexagonMachineFunctionInfo.h"
17 #include "HexagonSubtarget.h"
18 #include "HexagonTargetMachine.h"
19 #include "HexagonTargetObjectFile.h"
20 #include "llvm/CodeGen/CallingConvLower.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/CodeGen/MachineFunction.h"
23 #include "llvm/CodeGen/MachineInstrBuilder.h"
24 #include "llvm/CodeGen/MachineJumpTableInfo.h"
25 #include "llvm/CodeGen/MachineRegisterInfo.h"
26 #include "llvm/CodeGen/SelectionDAGISel.h"
27 #include "llvm/CodeGen/ValueTypes.h"
28 #include "llvm/IR/CallingConv.h"
29 #include "llvm/IR/DerivedTypes.h"
30 #include "llvm/IR/Function.h"
31 #include "llvm/IR/GlobalAlias.h"
32 #include "llvm/IR/GlobalVariable.h"
33 #include "llvm/IR/InlineAsm.h"
34 #include "llvm/IR/Intrinsics.h"
35 #include "llvm/Support/CommandLine.h"
36 #include "llvm/Support/Debug.h"
37 #include "llvm/Support/ErrorHandling.h"
38 #include "llvm/Support/raw_ostream.h"
42 #define DEBUG_TYPE "hexagon-lowering"
45 EmitJumpTables("hexagon-emit-jump-tables", cl::init(true), cl::Hidden,
46 cl::desc("Control jump table emission on Hexagon target"));
49 class HexagonCCState : public CCState {
50 int NumNamedVarArgParams;
53 HexagonCCState(CallingConv::ID CC, bool isVarArg, MachineFunction &MF,
54 const TargetMachine &TM, SmallVectorImpl<CCValAssign> &locs,
55 LLVMContext &C, int NumNamedVarArgParams)
56 : CCState(CC, isVarArg, MF, TM, locs, C),
57 NumNamedVarArgParams(NumNamedVarArgParams) {}
59 int getNumNamedVarArgParams() const { return NumNamedVarArgParams; }
63 // Implement calling convention for Hexagon.
65 CC_Hexagon(unsigned ValNo, MVT ValVT,
66 MVT LocVT, CCValAssign::LocInfo LocInfo,
67 ISD::ArgFlagsTy ArgFlags, CCState &State);
70 CC_Hexagon32(unsigned ValNo, MVT ValVT,
71 MVT LocVT, CCValAssign::LocInfo LocInfo,
72 ISD::ArgFlagsTy ArgFlags, CCState &State);
75 CC_Hexagon64(unsigned ValNo, MVT ValVT,
76 MVT LocVT, CCValAssign::LocInfo LocInfo,
77 ISD::ArgFlagsTy ArgFlags, CCState &State);
80 RetCC_Hexagon(unsigned ValNo, MVT ValVT,
81 MVT LocVT, CCValAssign::LocInfo LocInfo,
82 ISD::ArgFlagsTy ArgFlags, CCState &State);
85 RetCC_Hexagon32(unsigned ValNo, MVT ValVT,
86 MVT LocVT, CCValAssign::LocInfo LocInfo,
87 ISD::ArgFlagsTy ArgFlags, CCState &State);
90 RetCC_Hexagon64(unsigned ValNo, MVT ValVT,
91 MVT LocVT, CCValAssign::LocInfo LocInfo,
92 ISD::ArgFlagsTy ArgFlags, CCState &State);
95 CC_Hexagon_VarArg (unsigned ValNo, MVT ValVT,
96 MVT LocVT, CCValAssign::LocInfo LocInfo,
97 ISD::ArgFlagsTy ArgFlags, CCState &State) {
98 HexagonCCState &HState = static_cast<HexagonCCState &>(State);
100 // NumNamedVarArgParams can not be zero for a VarArg function.
101 assert((HState.getNumNamedVarArgParams() > 0) &&
102 "NumNamedVarArgParams is not bigger than zero.");
104 if ((int)ValNo < HState.getNumNamedVarArgParams()) {
105 // Deal with named arguments.
106 return CC_Hexagon(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State);
109 // Deal with un-named arguments.
111 if (ArgFlags.isByVal()) {
112 // If pass-by-value, the size allocated on stack is decided
113 // by ArgFlags.getByValSize(), not by the size of LocVT.
114 assert ((ArgFlags.getByValSize() > 8) &&
115 "ByValSize must be bigger than 8 bytes");
116 ofst = State.AllocateStack(ArgFlags.getByValSize(), 4);
117 State.addLoc(CCValAssign::getMem(ValNo, ValVT, ofst, LocVT, LocInfo));
120 if (LocVT == MVT::i1 || LocVT == MVT::i8 || LocVT == MVT::i16) {
123 if (ArgFlags.isSExt())
124 LocInfo = CCValAssign::SExt;
125 else if (ArgFlags.isZExt())
126 LocInfo = CCValAssign::ZExt;
128 LocInfo = CCValAssign::AExt;
130 if (LocVT == MVT::i32 || LocVT == MVT::f32) {
131 ofst = State.AllocateStack(4, 4);
132 State.addLoc(CCValAssign::getMem(ValNo, ValVT, ofst, LocVT, LocInfo));
135 if (LocVT == MVT::i64 || LocVT == MVT::f64) {
136 ofst = State.AllocateStack(8, 8);
137 State.addLoc(CCValAssign::getMem(ValNo, ValVT, ofst, LocVT, LocInfo));
145 CC_Hexagon (unsigned ValNo, MVT ValVT,
146 MVT LocVT, CCValAssign::LocInfo LocInfo,
147 ISD::ArgFlagsTy ArgFlags, CCState &State) {
149 if (ArgFlags.isByVal()) {
151 assert ((ArgFlags.getByValSize() > 8) &&
152 "ByValSize must be bigger than 8 bytes");
153 unsigned Offset = State.AllocateStack(ArgFlags.getByValSize(), 4);
154 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
158 if (LocVT == MVT::i1 || LocVT == MVT::i8 || LocVT == MVT::i16) {
161 if (ArgFlags.isSExt())
162 LocInfo = CCValAssign::SExt;
163 else if (ArgFlags.isZExt())
164 LocInfo = CCValAssign::ZExt;
166 LocInfo = CCValAssign::AExt;
169 if (LocVT == MVT::i32 || LocVT == MVT::f32) {
170 if (!CC_Hexagon32(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))
174 if (LocVT == MVT::i64 || LocVT == MVT::f64) {
175 if (!CC_Hexagon64(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))
179 return true; // CC didn't match.
183 static bool CC_Hexagon32(unsigned ValNo, MVT ValVT,
184 MVT LocVT, CCValAssign::LocInfo LocInfo,
185 ISD::ArgFlagsTy ArgFlags, CCState &State) {
187 static const MCPhysReg RegList[] = {
188 Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3, Hexagon::R4,
191 if (unsigned Reg = State.AllocateReg(RegList, 6)) {
192 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
196 unsigned Offset = State.AllocateStack(4, 4);
197 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
201 static bool CC_Hexagon64(unsigned ValNo, MVT ValVT,
202 MVT LocVT, CCValAssign::LocInfo LocInfo,
203 ISD::ArgFlagsTy ArgFlags, CCState &State) {
205 if (unsigned Reg = State.AllocateReg(Hexagon::D0)) {
206 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
210 static const MCPhysReg RegList1[] = {
211 Hexagon::D1, Hexagon::D2
213 static const MCPhysReg RegList2[] = {
214 Hexagon::R1, Hexagon::R3
216 if (unsigned Reg = State.AllocateReg(RegList1, RegList2, 2)) {
217 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
221 unsigned Offset = State.AllocateStack(8, 8, Hexagon::D2);
222 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
226 static bool RetCC_Hexagon(unsigned ValNo, MVT ValVT,
227 MVT LocVT, CCValAssign::LocInfo LocInfo,
228 ISD::ArgFlagsTy ArgFlags, CCState &State) {
231 if (LocVT == MVT::i1 ||
236 if (ArgFlags.isSExt())
237 LocInfo = CCValAssign::SExt;
238 else if (ArgFlags.isZExt())
239 LocInfo = CCValAssign::ZExt;
241 LocInfo = CCValAssign::AExt;
244 if (LocVT == MVT::i32 || LocVT == MVT::f32) {
245 if (!RetCC_Hexagon32(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))
249 if (LocVT == MVT::i64 || LocVT == MVT::f64) {
250 if (!RetCC_Hexagon64(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))
254 return true; // CC didn't match.
257 static bool RetCC_Hexagon32(unsigned ValNo, MVT ValVT,
258 MVT LocVT, CCValAssign::LocInfo LocInfo,
259 ISD::ArgFlagsTy ArgFlags, CCState &State) {
261 if (LocVT == MVT::i32 || LocVT == MVT::f32) {
262 if (unsigned Reg = State.AllocateReg(Hexagon::R0)) {
263 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
268 unsigned Offset = State.AllocateStack(4, 4);
269 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
273 static bool RetCC_Hexagon64(unsigned ValNo, MVT ValVT,
274 MVT LocVT, CCValAssign::LocInfo LocInfo,
275 ISD::ArgFlagsTy ArgFlags, CCState &State) {
276 if (LocVT == MVT::i64 || LocVT == MVT::f64) {
277 if (unsigned Reg = State.AllocateReg(Hexagon::D0)) {
278 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
283 unsigned Offset = State.AllocateStack(8, 8);
284 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
289 HexagonTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG)
294 /// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
295 /// by "Src" to address "Dst" of size "Size". Alignment information is
296 /// specified by the specific parameter attribute. The copy will be passed as
297 /// a byval function parameter. Sometimes what we are copying is the end of a
298 /// larger object, the part that does not fit in registers.
300 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
301 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
304 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32);
305 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
306 /*isVolatile=*/false, /*AlwaysInline=*/false,
307 MachinePointerInfo(), MachinePointerInfo());
311 // LowerReturn - Lower ISD::RET. If a struct is larger than 8 bytes and is
312 // passed by value, the function prototype is modified to return void and
313 // the value is stored in memory pointed by a pointer passed by caller.
315 HexagonTargetLowering::LowerReturn(SDValue Chain,
316 CallingConv::ID CallConv, bool isVarArg,
317 const SmallVectorImpl<ISD::OutputArg> &Outs,
318 const SmallVectorImpl<SDValue> &OutVals,
319 SDLoc dl, SelectionDAG &DAG) const {
321 // CCValAssign - represent the assignment of the return value to locations.
322 SmallVector<CCValAssign, 16> RVLocs;
324 // CCState - Info about the registers and stack slot.
325 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
326 getTargetMachine(), RVLocs, *DAG.getContext());
328 // Analyze return values of ISD::RET
329 CCInfo.AnalyzeReturn(Outs, RetCC_Hexagon);
332 SmallVector<SDValue, 4> RetOps(1, Chain);
334 // Copy the result values into the output registers.
335 for (unsigned i = 0; i != RVLocs.size(); ++i) {
336 CCValAssign &VA = RVLocs[i];
338 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), OutVals[i], Flag);
340 // Guarantee that all emitted copies are stuck together with flags.
341 Flag = Chain.getValue(1);
342 RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
345 RetOps[0] = Chain; // Update chain.
347 // Add the flag if we have it.
349 RetOps.push_back(Flag);
351 return DAG.getNode(HexagonISD::RET_FLAG, dl, MVT::Other,
352 &RetOps[0], RetOps.size());
358 /// LowerCallResult - Lower the result values of an ISD::CALL into the
359 /// appropriate copies out of appropriate physical registers. This assumes that
360 /// Chain/InFlag are the input chain/flag to use, and that TheCall is the call
361 /// being lowered. Returns a SDNode with the same number of values as the
364 HexagonTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
365 CallingConv::ID CallConv, bool isVarArg,
367 SmallVectorImpl<ISD::InputArg> &Ins,
368 SDLoc dl, SelectionDAG &DAG,
369 SmallVectorImpl<SDValue> &InVals,
370 const SmallVectorImpl<SDValue> &OutVals,
371 SDValue Callee) const {
373 // Assign locations to each value returned by this call.
374 SmallVector<CCValAssign, 16> RVLocs;
376 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
377 getTargetMachine(), RVLocs, *DAG.getContext());
379 CCInfo.AnalyzeCallResult(Ins, RetCC_Hexagon);
381 // Copy all of the result registers out of their specified physreg.
382 for (unsigned i = 0; i != RVLocs.size(); ++i) {
383 Chain = DAG.getCopyFromReg(Chain, dl,
384 RVLocs[i].getLocReg(),
385 RVLocs[i].getValVT(), InFlag).getValue(1);
386 InFlag = Chain.getValue(2);
387 InVals.push_back(Chain.getValue(0));
393 /// LowerCall - Functions arguments are copied from virtual regs to
394 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
396 HexagonTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
397 SmallVectorImpl<SDValue> &InVals) const {
398 SelectionDAG &DAG = CLI.DAG;
400 SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
401 SmallVectorImpl<SDValue> &OutVals = CLI.OutVals;
402 SmallVectorImpl<ISD::InputArg> &Ins = CLI.Ins;
403 SDValue Chain = CLI.Chain;
404 SDValue Callee = CLI.Callee;
405 bool &isTailCall = CLI.IsTailCall;
406 CallingConv::ID CallConv = CLI.CallConv;
407 bool isVarArg = CLI.IsVarArg;
409 bool IsStructRet = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
411 // Check for varargs.
412 int NumNamedVarArgParams = -1;
413 if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Callee))
415 const Function* CalleeFn = nullptr;
416 Callee = DAG.getTargetGlobalAddress(GA->getGlobal(), dl, MVT::i32);
417 if ((CalleeFn = dyn_cast<Function>(GA->getGlobal())))
419 // If a function has zero args and is a vararg function, that's
420 // disallowed so it must be an undeclared function. Do not assume
421 // varargs if the callee is undefined.
422 if (CalleeFn->isVarArg() &&
423 CalleeFn->getFunctionType()->getNumParams() != 0) {
424 NumNamedVarArgParams = CalleeFn->getFunctionType()->getNumParams();
429 // Analyze operands of the call, assigning locations to each operand.
430 SmallVector<CCValAssign, 16> ArgLocs;
431 HexagonCCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
432 getTargetMachine(), ArgLocs, *DAG.getContext(),
433 NumNamedVarArgParams);
435 if (NumNamedVarArgParams > 0)
436 CCInfo.AnalyzeCallOperands(Outs, CC_Hexagon_VarArg);
438 CCInfo.AnalyzeCallOperands(Outs, CC_Hexagon);
442 bool StructAttrFlag =
443 DAG.getMachineFunction().getFunction()->hasStructRetAttr();
444 isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,
445 isVarArg, IsStructRet,
447 Outs, OutVals, Ins, DAG);
448 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i){
449 CCValAssign &VA = ArgLocs[i];
456 DEBUG(dbgs () << "Eligible for Tail Call\n");
459 "Argument must be passed on stack. Not eligible for Tail Call\n");
462 // Get a count of how many bytes are to be pushed on the stack.
463 unsigned NumBytes = CCInfo.getNextStackOffset();
464 SmallVector<std::pair<unsigned, SDValue>, 16> RegsToPass;
465 SmallVector<SDValue, 8> MemOpChains;
468 DAG.getCopyFromReg(Chain, dl, TM.getRegisterInfo()->getStackRegister(),
471 // Walk the register/memloc assignments, inserting copies/loads.
472 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
473 CCValAssign &VA = ArgLocs[i];
474 SDValue Arg = OutVals[i];
475 ISD::ArgFlagsTy Flags = Outs[i].Flags;
477 // Promote the value if needed.
478 switch (VA.getLocInfo()) {
480 // Loc info must be one of Full, SExt, ZExt, or AExt.
481 llvm_unreachable("Unknown loc info!");
482 case CCValAssign::Full:
484 case CCValAssign::SExt:
485 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
487 case CCValAssign::ZExt:
488 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
490 case CCValAssign::AExt:
491 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
496 unsigned LocMemOffset = VA.getLocMemOffset();
497 SDValue PtrOff = DAG.getConstant(LocMemOffset, StackPtr.getValueType());
498 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff);
500 if (Flags.isByVal()) {
501 // The argument is a struct passed by value. According to LLVM, "Arg"
503 MemOpChains.push_back(CreateCopyOfByValArgument(Arg, PtrOff, Chain,
506 // The argument is not passed by value. "Arg" is a buildin type. It is
508 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
509 MachinePointerInfo(),false, false,
515 // Arguments that can be passed on register must be kept at RegsToPass
518 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
522 // Transform all store nodes into one single node because all store
523 // nodes are independent of each other.
524 if (!MemOpChains.empty()) {
525 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &MemOpChains[0],
530 Chain = DAG.getCALLSEQ_START(Chain, DAG.getConstant(NumBytes,
531 getPointerTy(), true),
534 // Build a sequence of copy-to-reg nodes chained together with token
535 // chain and flag operands which copy the outgoing args into registers.
536 // The InFlag in necessary since all emitted instructions must be
540 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
541 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
542 RegsToPass[i].second, InFlag);
543 InFlag = Chain.getValue(1);
547 // For tail calls lower the arguments to the 'real' stack slot.
549 // Force all the incoming stack arguments to be loaded from the stack
550 // before any new outgoing arguments are stored to the stack, because the
551 // outgoing stack slots may alias the incoming argument stack slots, and
552 // the alias isn't otherwise explicit. This is slightly more conservative
553 // than necessary, because it means that each store effectively depends
554 // on every argument instead of just those arguments it would clobber.
556 // Do not flag preceding copytoreg stuff together with the following stuff.
558 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
559 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
560 RegsToPass[i].second, InFlag);
561 InFlag = Chain.getValue(1);
566 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
567 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
568 // node so that legalize doesn't hack it.
569 if (flag_aligned_memcpy) {
570 const char *MemcpyName =
571 "__hexagon_memcpy_likely_aligned_min32bytes_mult8bytes";
573 DAG.getTargetExternalSymbol(MemcpyName, getPointerTy());
574 flag_aligned_memcpy = false;
575 } else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
576 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, getPointerTy());
577 } else if (ExternalSymbolSDNode *S =
578 dyn_cast<ExternalSymbolSDNode>(Callee)) {
579 Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy());
582 // Returns a chain & a flag for retval copy to use.
583 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
584 SmallVector<SDValue, 8> Ops;
585 Ops.push_back(Chain);
586 Ops.push_back(Callee);
588 // Add argument registers to the end of the list so that they are
589 // known live into the call.
590 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
591 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
592 RegsToPass[i].second.getValueType()));
595 if (InFlag.getNode()) {
596 Ops.push_back(InFlag);
600 return DAG.getNode(HexagonISD::TC_RETURN, dl, NodeTys, &Ops[0], Ops.size());
602 Chain = DAG.getNode(HexagonISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
603 InFlag = Chain.getValue(1);
605 // Create the CALLSEQ_END node.
606 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
607 DAG.getIntPtrConstant(0, true), InFlag, dl);
608 InFlag = Chain.getValue(1);
610 // Handle result values, copying them out of physregs into vregs that we
612 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl, DAG,
613 InVals, OutVals, Callee);
616 static bool getIndexedAddressParts(SDNode *Ptr, EVT VT,
617 bool isSEXTLoad, SDValue &Base,
618 SDValue &Offset, bool &isInc,
620 if (Ptr->getOpcode() != ISD::ADD)
623 if (VT == MVT::i64 || VT == MVT::i32 || VT == MVT::i16 || VT == MVT::i8) {
624 isInc = (Ptr->getOpcode() == ISD::ADD);
625 Base = Ptr->getOperand(0);
626 Offset = Ptr->getOperand(1);
627 // Ensure that Offset is a constant.
628 return (isa<ConstantSDNode>(Offset));
634 // TODO: Put this function along with the other isS* functions in
635 // HexagonISelDAGToDAG.cpp into a common file. Or better still, use the
636 // functions defined in HexagonOperands.td.
637 static bool Is_PostInc_S4_Offset(SDNode * S, int ShiftAmount) {
638 ConstantSDNode *N = cast<ConstantSDNode>(S);
640 // immS4 predicate - True if the immediate fits in a 4-bit sign extended.
642 int64_t v = (int64_t)N->getSExtValue();
644 if (ShiftAmount > 0) {
646 v = v >> ShiftAmount;
648 return (v <= 7) && (v >= -8) && (m == 0);
651 /// getPostIndexedAddressParts - returns true by value, base pointer and
652 /// offset pointer and addressing mode by reference if this node can be
653 /// combined with a load / store to form a post-indexed load / store.
654 bool HexagonTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
657 ISD::MemIndexedMode &AM,
658 SelectionDAG &DAG) const
662 bool isSEXTLoad = false;
664 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
665 VT = LD->getMemoryVT();
666 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
667 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
668 VT = ST->getMemoryVT();
669 if (ST->getValue().getValueType() == MVT::i64 && ST->isTruncatingStore()) {
677 bool isLegal = getIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
679 // ShiftAmount = number of left-shifted bits in the Hexagon instruction.
680 int ShiftAmount = VT.getSizeInBits() / 16;
681 if (isLegal && Is_PostInc_S4_Offset(Offset.getNode(), ShiftAmount)) {
682 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
689 SDValue HexagonTargetLowering::LowerINLINEASM(SDValue Op,
690 SelectionDAG &DAG) const {
691 SDNode *Node = Op.getNode();
692 MachineFunction &MF = DAG.getMachineFunction();
693 HexagonMachineFunctionInfo *FuncInfo =
694 MF.getInfo<HexagonMachineFunctionInfo>();
695 switch (Node->getOpcode()) {
696 case ISD::INLINEASM: {
697 unsigned NumOps = Node->getNumOperands();
698 if (Node->getOperand(NumOps-1).getValueType() == MVT::Glue)
699 --NumOps; // Ignore the flag operand.
701 for (unsigned i = InlineAsm::Op_FirstOperand; i != NumOps;) {
702 if (FuncInfo->hasClobberLR())
705 cast<ConstantSDNode>(Node->getOperand(i))->getZExtValue();
706 unsigned NumVals = InlineAsm::getNumOperandRegisters(Flags);
707 ++i; // Skip the ID value.
709 switch (InlineAsm::getKind(Flags)) {
710 default: llvm_unreachable("Bad flags!");
711 case InlineAsm::Kind_RegDef:
712 case InlineAsm::Kind_RegUse:
713 case InlineAsm::Kind_Imm:
714 case InlineAsm::Kind_Clobber:
715 case InlineAsm::Kind_Mem: {
716 for (; NumVals; --NumVals, ++i) {}
719 case InlineAsm::Kind_RegDefEarlyClobber: {
720 for (; NumVals; --NumVals, ++i) {
722 cast<RegisterSDNode>(Node->getOperand(i))->getReg();
725 if (Reg == TM.getRegisterInfo()->getRARegister()) {
726 FuncInfo->setHasClobberLR(true);
741 // Taken from the XCore backend.
743 SDValue HexagonTargetLowering::
744 LowerBR_JT(SDValue Op, SelectionDAG &DAG) const
746 SDValue Chain = Op.getOperand(0);
747 SDValue Table = Op.getOperand(1);
748 SDValue Index = Op.getOperand(2);
750 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
751 unsigned JTI = JT->getIndex();
752 MachineFunction &MF = DAG.getMachineFunction();
753 const MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
754 SDValue TargetJT = DAG.getTargetJumpTable(JT->getIndex(), MVT::i32);
756 // Mark all jump table targets as address taken.
757 const std::vector<MachineJumpTableEntry> &JTE = MJTI->getJumpTables();
758 const std::vector<MachineBasicBlock*> &JTBBs = JTE[JTI].MBBs;
759 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) {
760 MachineBasicBlock *MBB = JTBBs[i];
761 MBB->setHasAddressTaken();
762 // This line is needed to set the hasAddressTaken flag on the BasicBlock
764 BlockAddress::get(const_cast<BasicBlock *>(MBB->getBasicBlock()));
767 SDValue JumpTableBase = DAG.getNode(HexagonISD::WrapperJT, dl,
768 getPointerTy(), TargetJT);
769 SDValue ShiftIndex = DAG.getNode(ISD::SHL, dl, MVT::i32, Index,
770 DAG.getConstant(2, MVT::i32));
771 SDValue JTAddress = DAG.getNode(ISD::ADD, dl, MVT::i32, JumpTableBase,
773 SDValue LoadTarget = DAG.getLoad(MVT::i32, dl, Chain, JTAddress,
774 MachinePointerInfo(), false, false, false,
776 return DAG.getNode(HexagonISD::BR_JT, dl, MVT::Other, Chain, LoadTarget);
781 HexagonTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
782 SelectionDAG &DAG) const {
783 SDValue Chain = Op.getOperand(0);
784 SDValue Size = Op.getOperand(1);
787 unsigned SPReg = getStackPointerRegisterToSaveRestore();
789 // Get a reference to the stack pointer.
790 SDValue StackPointer = DAG.getCopyFromReg(Chain, dl, SPReg, MVT::i32);
792 // Subtract the dynamic size from the actual stack size to
793 // obtain the new stack size.
794 SDValue Sub = DAG.getNode(ISD::SUB, dl, MVT::i32, StackPointer, Size);
797 // For Hexagon, the outgoing memory arguments area should be on top of the
798 // alloca area on the stack i.e., the outgoing memory arguments should be
799 // at a lower address than the alloca area. Move the alloca area down the
800 // stack by adding back the space reserved for outgoing arguments to SP
803 // We do not know what the size of the outgoing args is at this point.
804 // So, we add a pseudo instruction ADJDYNALLOC that will adjust the
805 // stack pointer. We patch this instruction with the correct, known
806 // offset in emitPrologue().
808 // Use a placeholder immediate (zero) for now. This will be patched up
809 // by emitPrologue().
810 SDValue ArgAdjust = DAG.getNode(HexagonISD::ADJDYNALLOC, dl,
813 DAG.getConstant(0, MVT::i32));
815 // The Sub result contains the new stack start address, so it
816 // must be placed in the stack pointer register.
817 SDValue CopyChain = DAG.getCopyToReg(Chain, dl,
818 TM.getRegisterInfo()->getStackRegister(),
821 SDValue Ops[2] = { ArgAdjust, CopyChain };
822 return DAG.getMergeValues(Ops, 2, dl);
826 HexagonTargetLowering::LowerFormalArguments(SDValue Chain,
827 CallingConv::ID CallConv,
830 SmallVectorImpl<ISD::InputArg> &Ins,
831 SDLoc dl, SelectionDAG &DAG,
832 SmallVectorImpl<SDValue> &InVals)
835 MachineFunction &MF = DAG.getMachineFunction();
836 MachineFrameInfo *MFI = MF.getFrameInfo();
837 MachineRegisterInfo &RegInfo = MF.getRegInfo();
838 HexagonMachineFunctionInfo *FuncInfo =
839 MF.getInfo<HexagonMachineFunctionInfo>();
842 // Assign locations to all of the incoming arguments.
843 SmallVector<CCValAssign, 16> ArgLocs;
844 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
845 getTargetMachine(), ArgLocs, *DAG.getContext());
847 CCInfo.AnalyzeFormalArguments(Ins, CC_Hexagon);
849 // For LLVM, in the case when returning a struct by value (>8byte),
850 // the first argument is a pointer that points to the location on caller's
851 // stack where the return value will be stored. For Hexagon, the location on
852 // caller's stack is passed only when the struct size is smaller than (and
853 // equal to) 8 bytes. If not, no address will be passed into callee and
854 // callee return the result direclty through R0/R1.
856 SmallVector<SDValue, 4> MemOps;
858 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
859 CCValAssign &VA = ArgLocs[i];
860 ISD::ArgFlagsTy Flags = Ins[i].Flags;
862 unsigned StackLocation;
865 if ( (VA.isRegLoc() && !Flags.isByVal())
866 || (VA.isRegLoc() && Flags.isByVal() && Flags.getByValSize() > 8)) {
867 // Arguments passed in registers
868 // 1. int, long long, ptr args that get allocated in register.
869 // 2. Large struct that gets an register to put its address in.
870 EVT RegVT = VA.getLocVT();
871 if (RegVT == MVT::i8 || RegVT == MVT::i16 ||
872 RegVT == MVT::i32 || RegVT == MVT::f32) {
874 RegInfo.createVirtualRegister(&Hexagon::IntRegsRegClass);
875 RegInfo.addLiveIn(VA.getLocReg(), VReg);
876 InVals.push_back(DAG.getCopyFromReg(Chain, dl, VReg, RegVT));
877 } else if (RegVT == MVT::i64) {
879 RegInfo.createVirtualRegister(&Hexagon::DoubleRegsRegClass);
880 RegInfo.addLiveIn(VA.getLocReg(), VReg);
881 InVals.push_back(DAG.getCopyFromReg(Chain, dl, VReg, RegVT));
885 } else if (VA.isRegLoc() && Flags.isByVal() && Flags.getByValSize() <= 8) {
886 assert (0 && "ByValSize must be bigger than 8 bytes");
889 assert(VA.isMemLoc());
891 if (Flags.isByVal()) {
892 // If it's a byval parameter, then we need to compute the
893 // "real" size, not the size of the pointer.
894 ObjSize = Flags.getByValSize();
896 ObjSize = VA.getLocVT().getStoreSizeInBits() >> 3;
899 StackLocation = HEXAGON_LRFP_SIZE + VA.getLocMemOffset();
900 // Create the frame index object for this incoming parameter...
901 FI = MFI->CreateFixedObject(ObjSize, StackLocation, true);
903 // Create the SelectionDAG nodes cordl, responding to a load
904 // from this parameter.
905 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
907 if (Flags.isByVal()) {
908 // If it's a pass-by-value aggregate, then do not dereference the stack
909 // location. Instead, we should generate a reference to the stack
911 InVals.push_back(FIN);
913 InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
914 MachinePointerInfo(), false, false,
921 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &MemOps[0],
925 // This will point to the next argument passed via stack.
926 int FrameIndex = MFI->CreateFixedObject(Hexagon_PointerSize,
928 CCInfo.getNextStackOffset(),
930 FuncInfo->setVarArgsFrameIndex(FrameIndex);
937 HexagonTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
938 // VASTART stores the address of the VarArgsFrameIndex slot into the
939 // memory location argument.
940 MachineFunction &MF = DAG.getMachineFunction();
941 HexagonMachineFunctionInfo *QFI = MF.getInfo<HexagonMachineFunctionInfo>();
942 SDValue Addr = DAG.getFrameIndex(QFI->getVarArgsFrameIndex(), MVT::i32);
943 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
944 return DAG.getStore(Op.getOperand(0), SDLoc(Op), Addr,
945 Op.getOperand(1), MachinePointerInfo(SV), false,
950 HexagonTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
951 SDValue LHS = Op.getOperand(0);
952 SDValue RHS = Op.getOperand(1);
953 SDValue CC = Op.getOperand(4);
954 SDValue TrueVal = Op.getOperand(2);
955 SDValue FalseVal = Op.getOperand(3);
957 SDNode* OpNode = Op.getNode();
958 EVT SVT = OpNode->getValueType(0);
960 SDValue Cond = DAG.getNode(ISD::SETCC, dl, MVT::i1, LHS, RHS, CC);
961 return DAG.getNode(ISD::SELECT, dl, SVT, Cond, TrueVal, FalseVal);
965 HexagonTargetLowering::LowerConstantPool(SDValue Op, SelectionDAG &DAG) const {
966 EVT ValTy = Op.getValueType();
968 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
970 if (CP->isMachineConstantPoolEntry())
971 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), ValTy,
974 Res = DAG.getTargetConstantPool(CP->getConstVal(), ValTy,
976 return DAG.getNode(HexagonISD::CONST32, dl, ValTy, Res);
980 HexagonTargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const {
981 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
982 MachineFunction &MF = DAG.getMachineFunction();
983 MachineFrameInfo *MFI = MF.getFrameInfo();
984 MFI->setReturnAddressIsTaken(true);
986 if (verifyReturnAddressArgumentIsConstant(Op, DAG))
989 EVT VT = Op.getValueType();
991 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
993 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
994 SDValue Offset = DAG.getConstant(4, MVT::i32);
995 return DAG.getLoad(VT, dl, DAG.getEntryNode(),
996 DAG.getNode(ISD::ADD, dl, VT, FrameAddr, Offset),
997 MachinePointerInfo(), false, false, false, 0);
1000 // Return LR, which contains the return address. Mark it an implicit live-in.
1001 unsigned Reg = MF.addLiveIn(TRI->getRARegister(), getRegClassFor(MVT::i32));
1002 return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT);
1006 HexagonTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
1007 const HexagonRegisterInfo *TRI = TM.getRegisterInfo();
1008 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
1009 MFI->setFrameAddressIsTaken(true);
1011 EVT VT = Op.getValueType();
1013 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1014 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl,
1015 TRI->getFrameRegister(), VT);
1017 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
1018 MachinePointerInfo(),
1019 false, false, false, 0);
1023 SDValue HexagonTargetLowering::LowerATOMIC_FENCE(SDValue Op,
1024 SelectionDAG& DAG) const {
1026 return DAG.getNode(HexagonISD::BARRIER, dl, MVT::Other, Op.getOperand(0));
1030 SDValue HexagonTargetLowering::LowerGLOBALADDRESS(SDValue Op,
1031 SelectionDAG &DAG) const {
1033 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1034 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
1036 Result = DAG.getTargetGlobalAddress(GV, dl, getPointerTy(), Offset);
1038 const HexagonTargetObjectFile &TLOF =
1039 static_cast<const HexagonTargetObjectFile &>(getObjFileLowering());
1040 if (TLOF.IsGlobalInSmallSection(GV, getTargetMachine())) {
1041 return DAG.getNode(HexagonISD::CONST32_GP, dl, getPointerTy(), Result);
1044 return DAG.getNode(HexagonISD::CONST32, dl, getPointerTy(), Result);
1048 HexagonTargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const {
1049 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
1050 SDValue BA_SD = DAG.getTargetBlockAddress(BA, MVT::i32);
1052 return DAG.getNode(HexagonISD::CONST32_GP, dl, getPointerTy(), BA_SD);
1055 //===----------------------------------------------------------------------===//
1056 // TargetLowering Implementation
1057 //===----------------------------------------------------------------------===//
1059 HexagonTargetLowering::HexagonTargetLowering(HexagonTargetMachine
1061 : TargetLowering(targetmachine, new HexagonTargetObjectFile()),
1064 const HexagonRegisterInfo* QRI = TM.getRegisterInfo();
1066 // Set up the register classes.
1067 addRegisterClass(MVT::i32, &Hexagon::IntRegsRegClass);
1068 addRegisterClass(MVT::i64, &Hexagon::DoubleRegsRegClass);
1070 if (QRI->Subtarget.hasV5TOps()) {
1071 addRegisterClass(MVT::f32, &Hexagon::IntRegsRegClass);
1072 addRegisterClass(MVT::f64, &Hexagon::DoubleRegsRegClass);
1075 addRegisterClass(MVT::i1, &Hexagon::PredRegsRegClass);
1077 computeRegisterProperties();
1080 setPrefLoopAlignment(4);
1082 // Limits for inline expansion of memcpy/memmove
1083 MaxStoresPerMemcpy = 6;
1084 MaxStoresPerMemmove = 6;
1087 // Library calls for unsupported operations
1090 setLibcallName(RTLIB::SINTTOFP_I128_F64, "__hexagon_floattidf");
1091 setLibcallName(RTLIB::SINTTOFP_I128_F32, "__hexagon_floattisf");
1093 setLibcallName(RTLIB::FPTOUINT_F32_I128, "__hexagon_fixunssfti");
1094 setLibcallName(RTLIB::FPTOUINT_F64_I128, "__hexagon_fixunsdfti");
1096 setLibcallName(RTLIB::FPTOSINT_F32_I128, "__hexagon_fixsfti");
1097 setLibcallName(RTLIB::FPTOSINT_F64_I128, "__hexagon_fixdfti");
1099 setLibcallName(RTLIB::SDIV_I32, "__hexagon_divsi3");
1100 setOperationAction(ISD::SDIV, MVT::i32, Expand);
1101 setLibcallName(RTLIB::SREM_I32, "__hexagon_umodsi3");
1102 setOperationAction(ISD::SREM, MVT::i32, Expand);
1104 setLibcallName(RTLIB::SDIV_I64, "__hexagon_divdi3");
1105 setOperationAction(ISD::SDIV, MVT::i64, Expand);
1106 setLibcallName(RTLIB::SREM_I64, "__hexagon_moddi3");
1107 setOperationAction(ISD::SREM, MVT::i64, Expand);
1109 setLibcallName(RTLIB::UDIV_I32, "__hexagon_udivsi3");
1110 setOperationAction(ISD::UDIV, MVT::i32, Expand);
1112 setLibcallName(RTLIB::UDIV_I64, "__hexagon_udivdi3");
1113 setOperationAction(ISD::UDIV, MVT::i64, Expand);
1115 setLibcallName(RTLIB::UREM_I32, "__hexagon_umodsi3");
1116 setOperationAction(ISD::UREM, MVT::i32, Expand);
1118 setLibcallName(RTLIB::UREM_I64, "__hexagon_umoddi3");
1119 setOperationAction(ISD::UREM, MVT::i64, Expand);
1121 setLibcallName(RTLIB::DIV_F32, "__hexagon_divsf3");
1122 setOperationAction(ISD::FDIV, MVT::f32, Expand);
1124 setLibcallName(RTLIB::DIV_F64, "__hexagon_divdf3");
1125 setOperationAction(ISD::FDIV, MVT::f64, Expand);
1127 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
1128 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
1129 setOperationAction(ISD::FSIN, MVT::f32, Expand);
1130 setOperationAction(ISD::FSIN, MVT::f64, Expand);
1132 if (QRI->Subtarget.hasV5TOps()) {
1133 // Hexagon V5 Support.
1134 setOperationAction(ISD::FADD, MVT::f32, Legal);
1135 setOperationAction(ISD::FADD, MVT::f64, Legal);
1136 setOperationAction(ISD::FP_EXTEND, MVT::f32, Legal);
1137 setCondCodeAction(ISD::SETOEQ, MVT::f32, Legal);
1138 setCondCodeAction(ISD::SETOEQ, MVT::f64, Legal);
1139 setCondCodeAction(ISD::SETUEQ, MVT::f32, Legal);
1140 setCondCodeAction(ISD::SETUEQ, MVT::f64, Legal);
1142 setCondCodeAction(ISD::SETOGE, MVT::f32, Legal);
1143 setCondCodeAction(ISD::SETOGE, MVT::f64, Legal);
1144 setCondCodeAction(ISD::SETUGE, MVT::f32, Legal);
1145 setCondCodeAction(ISD::SETUGE, MVT::f64, Legal);
1147 setCondCodeAction(ISD::SETOGT, MVT::f32, Legal);
1148 setCondCodeAction(ISD::SETOGT, MVT::f64, Legal);
1149 setCondCodeAction(ISD::SETUGT, MVT::f32, Legal);
1150 setCondCodeAction(ISD::SETUGT, MVT::f64, Legal);
1152 setCondCodeAction(ISD::SETOLE, MVT::f32, Legal);
1153 setCondCodeAction(ISD::SETOLE, MVT::f64, Legal);
1154 setCondCodeAction(ISD::SETOLT, MVT::f32, Legal);
1155 setCondCodeAction(ISD::SETOLT, MVT::f64, Legal);
1157 setOperationAction(ISD::ConstantFP, MVT::f32, Legal);
1158 setOperationAction(ISD::ConstantFP, MVT::f64, Legal);
1160 setOperationAction(ISD::FP_TO_UINT, MVT::i1, Promote);
1161 setOperationAction(ISD::FP_TO_SINT, MVT::i1, Promote);
1162 setOperationAction(ISD::UINT_TO_FP, MVT::i1, Promote);
1163 setOperationAction(ISD::SINT_TO_FP, MVT::i1, Promote);
1165 setOperationAction(ISD::FP_TO_UINT, MVT::i8, Promote);
1166 setOperationAction(ISD::FP_TO_SINT, MVT::i8, Promote);
1167 setOperationAction(ISD::UINT_TO_FP, MVT::i8, Promote);
1168 setOperationAction(ISD::SINT_TO_FP, MVT::i8, Promote);
1170 setOperationAction(ISD::FP_TO_UINT, MVT::i16, Promote);
1171 setOperationAction(ISD::FP_TO_SINT, MVT::i16, Promote);
1172 setOperationAction(ISD::UINT_TO_FP, MVT::i16, Promote);
1173 setOperationAction(ISD::SINT_TO_FP, MVT::i16, Promote);
1175 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Legal);
1176 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Legal);
1177 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Legal);
1178 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Legal);
1180 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Legal);
1181 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Legal);
1182 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Legal);
1183 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Legal);
1185 setOperationAction(ISD::FABS, MVT::f32, Legal);
1186 setOperationAction(ISD::FABS, MVT::f64, Expand);
1188 setOperationAction(ISD::FNEG, MVT::f32, Legal);
1189 setOperationAction(ISD::FNEG, MVT::f64, Expand);
1192 // Expand fp<->uint.
1193 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Expand);
1194 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
1196 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
1197 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
1199 setLibcallName(RTLIB::SINTTOFP_I64_F32, "__hexagon_floatdisf");
1200 setLibcallName(RTLIB::UINTTOFP_I64_F32, "__hexagon_floatundisf");
1202 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__hexagon_floatunsisf");
1203 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__hexagon_floatsisf");
1205 setLibcallName(RTLIB::SINTTOFP_I64_F64, "__hexagon_floatdidf");
1206 setLibcallName(RTLIB::UINTTOFP_I64_F64, "__hexagon_floatundidf");
1208 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__hexagon_floatunsidf");
1209 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__hexagon_floatsidf");
1211 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__hexagon_fixunssfsi");
1212 setLibcallName(RTLIB::FPTOUINT_F32_I64, "__hexagon_fixunssfdi");
1214 setLibcallName(RTLIB::FPTOSINT_F64_I64, "__hexagon_fixdfdi");
1215 setLibcallName(RTLIB::FPTOSINT_F32_I64, "__hexagon_fixsfdi");
1217 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__hexagon_fixunsdfsi");
1218 setLibcallName(RTLIB::FPTOUINT_F64_I64, "__hexagon_fixunsdfdi");
1220 setLibcallName(RTLIB::ADD_F64, "__hexagon_adddf3");
1221 setOperationAction(ISD::FADD, MVT::f64, Expand);
1223 setLibcallName(RTLIB::ADD_F32, "__hexagon_addsf3");
1224 setOperationAction(ISD::FADD, MVT::f32, Expand);
1226 setLibcallName(RTLIB::FPEXT_F32_F64, "__hexagon_extendsfdf2");
1227 setOperationAction(ISD::FP_EXTEND, MVT::f32, Expand);
1229 setLibcallName(RTLIB::OEQ_F32, "__hexagon_eqsf2");
1230 setCondCodeAction(ISD::SETOEQ, MVT::f32, Expand);
1232 setLibcallName(RTLIB::OEQ_F64, "__hexagon_eqdf2");
1233 setCondCodeAction(ISD::SETOEQ, MVT::f64, Expand);
1235 setLibcallName(RTLIB::OGE_F32, "__hexagon_gesf2");
1236 setCondCodeAction(ISD::SETOGE, MVT::f32, Expand);
1238 setLibcallName(RTLIB::OGE_F64, "__hexagon_gedf2");
1239 setCondCodeAction(ISD::SETOGE, MVT::f64, Expand);
1241 setLibcallName(RTLIB::OGT_F32, "__hexagon_gtsf2");
1242 setCondCodeAction(ISD::SETOGT, MVT::f32, Expand);
1244 setLibcallName(RTLIB::OGT_F64, "__hexagon_gtdf2");
1245 setCondCodeAction(ISD::SETOGT, MVT::f64, Expand);
1247 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__hexagon_fixdfsi");
1248 setOperationAction(ISD::FP_TO_SINT, MVT::f64, Expand);
1250 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__hexagon_fixsfsi");
1251 setOperationAction(ISD::FP_TO_SINT, MVT::f32, Expand);
1253 setLibcallName(RTLIB::OLE_F64, "__hexagon_ledf2");
1254 setCondCodeAction(ISD::SETOLE, MVT::f64, Expand);
1256 setLibcallName(RTLIB::OLE_F32, "__hexagon_lesf2");
1257 setCondCodeAction(ISD::SETOLE, MVT::f32, Expand);
1259 setLibcallName(RTLIB::OLT_F64, "__hexagon_ltdf2");
1260 setCondCodeAction(ISD::SETOLT, MVT::f64, Expand);
1262 setLibcallName(RTLIB::OLT_F32, "__hexagon_ltsf2");
1263 setCondCodeAction(ISD::SETOLT, MVT::f32, Expand);
1265 setLibcallName(RTLIB::MUL_F64, "__hexagon_muldf3");
1266 setOperationAction(ISD::FMUL, MVT::f64, Expand);
1268 setLibcallName(RTLIB::MUL_F32, "__hexagon_mulsf3");
1269 setOperationAction(ISD::MUL, MVT::f32, Expand);
1271 setLibcallName(RTLIB::UNE_F64, "__hexagon_nedf2");
1272 setCondCodeAction(ISD::SETUNE, MVT::f64, Expand);
1274 setLibcallName(RTLIB::UNE_F32, "__hexagon_nesf2");
1276 setLibcallName(RTLIB::SUB_F64, "__hexagon_subdf3");
1277 setOperationAction(ISD::SUB, MVT::f64, Expand);
1279 setLibcallName(RTLIB::SUB_F32, "__hexagon_subsf3");
1280 setOperationAction(ISD::SUB, MVT::f32, Expand);
1282 setLibcallName(RTLIB::FPROUND_F64_F32, "__hexagon_truncdfsf2");
1283 setOperationAction(ISD::FP_ROUND, MVT::f64, Expand);
1285 setLibcallName(RTLIB::UO_F64, "__hexagon_unorddf2");
1286 setCondCodeAction(ISD::SETUO, MVT::f64, Expand);
1288 setLibcallName(RTLIB::O_F64, "__hexagon_unorddf2");
1289 setCondCodeAction(ISD::SETO, MVT::f64, Expand);
1291 setLibcallName(RTLIB::O_F32, "__hexagon_unordsf2");
1292 setCondCodeAction(ISD::SETO, MVT::f32, Expand);
1294 setLibcallName(RTLIB::UO_F32, "__hexagon_unordsf2");
1295 setCondCodeAction(ISD::SETUO, MVT::f32, Expand);
1297 setOperationAction(ISD::FABS, MVT::f32, Expand);
1298 setOperationAction(ISD::FABS, MVT::f64, Expand);
1299 setOperationAction(ISD::FNEG, MVT::f32, Expand);
1300 setOperationAction(ISD::FNEG, MVT::f64, Expand);
1303 setLibcallName(RTLIB::SREM_I32, "__hexagon_modsi3");
1304 setOperationAction(ISD::SREM, MVT::i32, Expand);
1306 setIndexedLoadAction(ISD::POST_INC, MVT::i8, Legal);
1307 setIndexedLoadAction(ISD::POST_INC, MVT::i16, Legal);
1308 setIndexedLoadAction(ISD::POST_INC, MVT::i32, Legal);
1309 setIndexedLoadAction(ISD::POST_INC, MVT::i64, Legal);
1311 setIndexedStoreAction(ISD::POST_INC, MVT::i8, Legal);
1312 setIndexedStoreAction(ISD::POST_INC, MVT::i16, Legal);
1313 setIndexedStoreAction(ISD::POST_INC, MVT::i32, Legal);
1314 setIndexedStoreAction(ISD::POST_INC, MVT::i64, Legal);
1316 setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
1318 // Turn FP extload into load/fextend.
1319 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
1320 // Hexagon has a i1 sign extending load.
1321 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Expand);
1322 // Turn FP truncstore into trunc + store.
1323 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
1325 // Custom legalize GlobalAddress nodes into CONST32.
1326 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
1327 setOperationAction(ISD::GlobalAddress, MVT::i8, Custom);
1328 setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
1330 setOperationAction(ISD::TRUNCATE, MVT::i64, Expand);
1332 // Hexagon doesn't have sext_inreg, replace them with shl/sra.
1333 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
1335 // Hexagon has no REM or DIVREM operations.
1336 setOperationAction(ISD::UREM, MVT::i32, Expand);
1337 setOperationAction(ISD::SREM, MVT::i32, Expand);
1338 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
1339 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
1340 setOperationAction(ISD::SREM, MVT::i64, Expand);
1341 setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
1342 setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
1344 setOperationAction(ISD::BSWAP, MVT::i64, Expand);
1346 // Lower SELECT_CC to SETCC and SELECT.
1347 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
1348 setOperationAction(ISD::SELECT_CC, MVT::i64, Custom);
1350 if (QRI->Subtarget.hasV5TOps()) {
1352 // We need to make the operation type of SELECT node to be Custom,
1353 // such that we don't go into the infinite loop of
1354 // select -> setcc -> select_cc -> select loop.
1355 setOperationAction(ISD::SELECT, MVT::f32, Custom);
1356 setOperationAction(ISD::SELECT, MVT::f64, Custom);
1358 setOperationAction(ISD::SELECT_CC, MVT::f32, Expand);
1359 setOperationAction(ISD::SELECT_CC, MVT::f64, Expand);
1360 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
1364 // Hexagon has no select or setcc: expand to SELECT_CC.
1365 setOperationAction(ISD::SELECT, MVT::f32, Expand);
1366 setOperationAction(ISD::SELECT, MVT::f64, Expand);
1368 // This is a workaround documented in DAGCombiner.cpp:2892 We don't
1369 // support SELECT_CC on every type.
1370 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
1374 if (EmitJumpTables) {
1375 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
1377 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
1379 // Increase jump tables cutover to 5, was 4.
1380 setMinimumJumpTableEntries(5);
1382 setOperationAction(ISD::BR_CC, MVT::f32, Expand);
1383 setOperationAction(ISD::BR_CC, MVT::f64, Expand);
1384 setOperationAction(ISD::BR_CC, MVT::i1, Expand);
1385 setOperationAction(ISD::BR_CC, MVT::i32, Expand);
1386 setOperationAction(ISD::BR_CC, MVT::i64, Expand);
1388 setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Custom);
1390 setOperationAction(ISD::FSIN , MVT::f64, Expand);
1391 setOperationAction(ISD::FCOS , MVT::f64, Expand);
1392 setOperationAction(ISD::FREM , MVT::f64, Expand);
1393 setOperationAction(ISD::FSIN , MVT::f32, Expand);
1394 setOperationAction(ISD::FCOS , MVT::f32, Expand);
1395 setOperationAction(ISD::FREM , MVT::f32, Expand);
1396 setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
1397 setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
1399 // In V4, we have double word add/sub with carry. The problem with
1400 // modelling this instruction is that it produces 2 results - Rdd and Px.
1401 // To model update of Px, we will have to use Defs[p0..p3] which will
1402 // cause any predicate live range to spill. So, we pretend we dont't
1403 // have these instructions.
1404 setOperationAction(ISD::ADDE, MVT::i8, Expand);
1405 setOperationAction(ISD::ADDE, MVT::i16, Expand);
1406 setOperationAction(ISD::ADDE, MVT::i32, Expand);
1407 setOperationAction(ISD::ADDE, MVT::i64, Expand);
1408 setOperationAction(ISD::SUBE, MVT::i8, Expand);
1409 setOperationAction(ISD::SUBE, MVT::i16, Expand);
1410 setOperationAction(ISD::SUBE, MVT::i32, Expand);
1411 setOperationAction(ISD::SUBE, MVT::i64, Expand);
1412 setOperationAction(ISD::ADDC, MVT::i8, Expand);
1413 setOperationAction(ISD::ADDC, MVT::i16, Expand);
1414 setOperationAction(ISD::ADDC, MVT::i32, Expand);
1415 setOperationAction(ISD::ADDC, MVT::i64, Expand);
1416 setOperationAction(ISD::SUBC, MVT::i8, Expand);
1417 setOperationAction(ISD::SUBC, MVT::i16, Expand);
1418 setOperationAction(ISD::SUBC, MVT::i32, Expand);
1419 setOperationAction(ISD::SUBC, MVT::i64, Expand);
1421 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
1422 setOperationAction(ISD::CTPOP, MVT::i64, Expand);
1423 setOperationAction(ISD::CTTZ , MVT::i32, Expand);
1424 setOperationAction(ISD::CTTZ , MVT::i64, Expand);
1425 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand);
1426 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i64, Expand);
1427 setOperationAction(ISD::CTLZ , MVT::i32, Expand);
1428 setOperationAction(ISD::CTLZ , MVT::i64, Expand);
1429 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand);
1430 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Expand);
1431 setOperationAction(ISD::ROTL , MVT::i32, Expand);
1432 setOperationAction(ISD::ROTR , MVT::i32, Expand);
1433 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
1434 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
1435 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
1436 setOperationAction(ISD::FPOW , MVT::f64, Expand);
1437 setOperationAction(ISD::FPOW , MVT::f32, Expand);
1439 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
1440 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
1441 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
1443 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
1444 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
1446 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
1447 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
1449 setOperationAction(ISD::EH_RETURN, MVT::Other, Custom);
1451 if (TM.getSubtargetImpl()->isSubtargetV2()) {
1452 setExceptionPointerRegister(Hexagon::R20);
1453 setExceptionSelectorRegister(Hexagon::R21);
1455 setExceptionPointerRegister(Hexagon::R0);
1456 setExceptionSelectorRegister(Hexagon::R1);
1459 // VASTART needs to be custom lowered to use the VarArgsFrameIndex.
1460 setOperationAction(ISD::VASTART , MVT::Other, Custom);
1462 // Use the default implementation.
1463 setOperationAction(ISD::VAARG , MVT::Other, Expand);
1464 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
1465 setOperationAction(ISD::VAEND , MVT::Other, Expand);
1466 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
1467 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
1470 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
1471 setOperationAction(ISD::INLINEASM , MVT::Other, Custom);
1473 setMinFunctionAlignment(2);
1475 // Needed for DYNAMIC_STACKALLOC expansion.
1476 unsigned StackRegister = TM.getRegisterInfo()->getStackRegister();
1477 setStackPointerRegisterToSaveRestore(StackRegister);
1478 setSchedulingPreference(Sched::VLIW);
1483 HexagonTargetLowering::getTargetNodeName(unsigned Opcode) const {
1485 default: return nullptr;
1486 case HexagonISD::CONST32: return "HexagonISD::CONST32";
1487 case HexagonISD::CONST32_GP: return "HexagonISD::CONST32_GP";
1488 case HexagonISD::CONST32_Int_Real: return "HexagonISD::CONST32_Int_Real";
1489 case HexagonISD::ADJDYNALLOC: return "HexagonISD::ADJDYNALLOC";
1490 case HexagonISD::CMPICC: return "HexagonISD::CMPICC";
1491 case HexagonISD::CMPFCC: return "HexagonISD::CMPFCC";
1492 case HexagonISD::BRICC: return "HexagonISD::BRICC";
1493 case HexagonISD::BRFCC: return "HexagonISD::BRFCC";
1494 case HexagonISD::SELECT_ICC: return "HexagonISD::SELECT_ICC";
1495 case HexagonISD::SELECT_FCC: return "HexagonISD::SELECT_FCC";
1496 case HexagonISD::Hi: return "HexagonISD::Hi";
1497 case HexagonISD::Lo: return "HexagonISD::Lo";
1498 case HexagonISD::FTOI: return "HexagonISD::FTOI";
1499 case HexagonISD::ITOF: return "HexagonISD::ITOF";
1500 case HexagonISD::CALL: return "HexagonISD::CALL";
1501 case HexagonISD::RET_FLAG: return "HexagonISD::RET_FLAG";
1502 case HexagonISD::BR_JT: return "HexagonISD::BR_JT";
1503 case HexagonISD::TC_RETURN: return "HexagonISD::TC_RETURN";
1504 case HexagonISD::EH_RETURN: return "HexagonISD::EH_RETURN";
1509 HexagonTargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const {
1510 EVT MTy1 = EVT::getEVT(Ty1);
1511 EVT MTy2 = EVT::getEVT(Ty2);
1512 if (!MTy1.isSimple() || !MTy2.isSimple()) {
1515 return ((MTy1.getSimpleVT() == MVT::i64) && (MTy2.getSimpleVT() == MVT::i32));
1518 bool HexagonTargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
1519 if (!VT1.isSimple() || !VT2.isSimple()) {
1522 return ((VT1.getSimpleVT() == MVT::i64) && (VT2.getSimpleVT() == MVT::i32));
1526 HexagonTargetLowering::allowTruncateForTailCall(Type *Ty1, Type *Ty2) const {
1527 // Assuming the caller does not have either a signext or zeroext modifier, and
1528 // only one value is accepted, any reasonable truncation is allowed.
1529 if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
1532 // FIXME: in principle up to 64-bit could be made safe, but it would be very
1533 // fragile at the moment: any support for multiple value returns would be
1534 // liable to disallow tail calls involving i64 -> iN truncation in many cases.
1535 return Ty1->getPrimitiveSizeInBits() <= 32;
1539 HexagonTargetLowering::LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const {
1540 SDValue Chain = Op.getOperand(0);
1541 SDValue Offset = Op.getOperand(1);
1542 SDValue Handler = Op.getOperand(2);
1545 // Mark function as containing a call to EH_RETURN.
1546 HexagonMachineFunctionInfo *FuncInfo =
1547 DAG.getMachineFunction().getInfo<HexagonMachineFunctionInfo>();
1548 FuncInfo->setHasEHReturn();
1550 unsigned OffsetReg = Hexagon::R28;
1552 SDValue StoreAddr = DAG.getNode(ISD::ADD, dl, getPointerTy(),
1553 DAG.getRegister(Hexagon::R30, getPointerTy()),
1554 DAG.getIntPtrConstant(4));
1555 Chain = DAG.getStore(Chain, dl, Handler, StoreAddr, MachinePointerInfo(),
1557 Chain = DAG.getCopyToReg(Chain, dl, OffsetReg, Offset);
1559 // Not needed we already use it as explict input to EH_RETURN.
1560 // MF.getRegInfo().addLiveOut(OffsetReg);
1562 return DAG.getNode(HexagonISD::EH_RETURN, dl, MVT::Other, Chain);
1566 HexagonTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
1567 switch (Op.getOpcode()) {
1568 default: llvm_unreachable("Should not custom lower this!");
1569 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
1570 case ISD::EH_RETURN: return LowerEH_RETURN(Op, DAG);
1571 // Frame & Return address. Currently unimplemented.
1572 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
1573 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
1574 case ISD::GlobalTLSAddress:
1575 llvm_unreachable("TLS not implemented for Hexagon.");
1576 case ISD::ATOMIC_FENCE: return LowerATOMIC_FENCE(Op, DAG);
1577 case ISD::GlobalAddress: return LowerGLOBALADDRESS(Op, DAG);
1578 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
1579 case ISD::VASTART: return LowerVASTART(Op, DAG);
1580 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
1582 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
1583 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
1584 case ISD::SELECT: return Op;
1585 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
1586 case ISD::INLINEASM: return LowerINLINEASM(Op, DAG);
1593 //===----------------------------------------------------------------------===//
1594 // Hexagon Scheduler Hooks
1595 //===----------------------------------------------------------------------===//
1597 HexagonTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1598 MachineBasicBlock *BB)
1600 switch (MI->getOpcode()) {
1601 case Hexagon::ADJDYNALLOC: {
1602 MachineFunction *MF = BB->getParent();
1603 HexagonMachineFunctionInfo *FuncInfo =
1604 MF->getInfo<HexagonMachineFunctionInfo>();
1605 FuncInfo->addAllocaAdjustInst(MI);
1608 default: llvm_unreachable("Unexpected instr type to insert");
1612 //===----------------------------------------------------------------------===//
1613 // Inline Assembly Support
1614 //===----------------------------------------------------------------------===//
1616 std::pair<unsigned, const TargetRegisterClass*>
1617 HexagonTargetLowering::getRegForInlineAsmConstraint(const
1618 std::string &Constraint,
1620 if (Constraint.size() == 1) {
1621 switch (Constraint[0]) {
1623 switch (VT.SimpleTy) {
1625 llvm_unreachable("getRegForInlineAsmConstraint Unhandled data type");
1630 return std::make_pair(0U, &Hexagon::IntRegsRegClass);
1633 return std::make_pair(0U, &Hexagon::DoubleRegsRegClass);
1636 llvm_unreachable("Unknown asm register class");
1640 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
1643 /// isFPImmLegal - Returns true if the target can instruction select the
1644 /// specified FP immediate natively. If false, the legalizer will
1645 /// materialize the FP immediate as a load from a constant pool.
1646 bool HexagonTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
1647 const HexagonRegisterInfo* QRI = TM.getRegisterInfo();
1648 return QRI->Subtarget.hasV5TOps();
1651 /// isLegalAddressingMode - Return true if the addressing mode represented by
1652 /// AM is legal for this target, for a load/store of the specified type.
1653 bool HexagonTargetLowering::isLegalAddressingMode(const AddrMode &AM,
1655 // Allows a signed-extended 11-bit immediate field.
1656 if (AM.BaseOffs <= -(1LL << 13) || AM.BaseOffs >= (1LL << 13)-1) {
1660 // No global is ever allowed as a base.
1665 int Scale = AM.Scale;
1666 if (Scale < 0) Scale = -Scale;
1668 case 0: // No scale reg, "r+i", "r", or just "i".
1670 default: // No scaled addressing mode.
1676 /// isLegalICmpImmediate - Return true if the specified immediate is legal
1677 /// icmp immediate, that is the target has icmp instructions which can compare
1678 /// a register against the immediate without having to materialize the
1679 /// immediate into a register.
1680 bool HexagonTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
1681 return Imm >= -512 && Imm <= 511;
1684 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
1685 /// for tail call optimization. Targets which want to do tail call
1686 /// optimization should implement this function.
1687 bool HexagonTargetLowering::IsEligibleForTailCallOptimization(
1689 CallingConv::ID CalleeCC,
1691 bool isCalleeStructRet,
1692 bool isCallerStructRet,
1693 const SmallVectorImpl<ISD::OutputArg> &Outs,
1694 const SmallVectorImpl<SDValue> &OutVals,
1695 const SmallVectorImpl<ISD::InputArg> &Ins,
1696 SelectionDAG& DAG) const {
1697 const Function *CallerF = DAG.getMachineFunction().getFunction();
1698 CallingConv::ID CallerCC = CallerF->getCallingConv();
1699 bool CCMatch = CallerCC == CalleeCC;
1701 // ***************************************************************************
1702 // Look for obvious safe cases to perform tail call optimization that do not
1703 // require ABI changes.
1704 // ***************************************************************************
1706 // If this is a tail call via a function pointer, then don't do it!
1707 if (!(dyn_cast<GlobalAddressSDNode>(Callee))
1708 && !(dyn_cast<ExternalSymbolSDNode>(Callee))) {
1712 // Do not optimize if the calling conventions do not match.
1716 // Do not tail call optimize vararg calls.
1720 // Also avoid tail call optimization if either caller or callee uses struct
1721 // return semantics.
1722 if (isCalleeStructRet || isCallerStructRet)
1725 // In addition to the cases above, we also disable Tail Call Optimization if
1726 // the calling convention code that at least one outgoing argument needs to
1727 // go on the stack. We cannot check that here because at this point that
1728 // information is not available.