1//===- MipsCallLowering.cpp -------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9/// \file
10/// This file implements the lowering of LLVM calls to machine code calls for
11/// GlobalISel.
12//
13//===----------------------------------------------------------------------===//
14
15#include "MipsCallLowering.h"
16#include "MipsCCState.h"
17#include "MipsMachineFunction.h"
18#include "MipsTargetMachine.h"
19#include "llvm/CodeGen/Analysis.h"
20#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
21#include "llvm/CodeGen/MachineFrameInfo.h"
22
23using namespace llvm;
24
25MipsCallLowering::MipsCallLowering(const MipsTargetLowering &TLI)
26 : CallLowering(&TLI) {}
27
28namespace {
29struct MipsOutgoingValueAssigner : public CallLowering::OutgoingValueAssigner {
30 /// This is the name of the function being called
31 /// FIXME: Relying on this is unsound
32 const char *Func = nullptr;
33
34 /// Is this a return value, or an outgoing call operand.
35 bool IsReturn;
36
37 MipsOutgoingValueAssigner(CCAssignFn *AssignFn_, const char *Func,
38 bool IsReturn)
39 : OutgoingValueAssigner(AssignFn_), Func(Func), IsReturn(IsReturn) {}
40
41 bool assignArg(unsigned ValNo, EVT OrigVT, MVT ValVT, MVT LocVT,
42 CCValAssign::LocInfo LocInfo,
43 const CallLowering::ArgInfo &Info, ISD::ArgFlagsTy Flags,
44 CCState &State_) override {
45 MipsCCState &State = static_cast<MipsCCState &>(State_);
46
47 if (IsReturn)
48 State.PreAnalyzeReturnValue(ArgVT: EVT::getEVT(Ty: Info.Ty));
49 else
50 State.PreAnalyzeCallOperand(ArgTy: Info.Ty, IsFixed: Info.IsFixed, Func);
51
52 return CallLowering::OutgoingValueAssigner::assignArg(
53 ValNo, OrigVT, ValVT, LocVT, LocInfo, Info, Flags, State);
54 }
55};
56
57struct MipsIncomingValueAssigner : public CallLowering::IncomingValueAssigner {
58 /// This is the name of the function being called
59 /// FIXME: Relying on this is unsound
60 const char *Func = nullptr;
61
62 /// Is this a call return value, or an incoming function argument.
63 bool IsReturn;
64
65 MipsIncomingValueAssigner(CCAssignFn *AssignFn_, const char *Func,
66 bool IsReturn)
67 : IncomingValueAssigner(AssignFn_), Func(Func), IsReturn(IsReturn) {}
68
69 bool assignArg(unsigned ValNo, EVT OrigVT, MVT ValVT, MVT LocVT,
70 CCValAssign::LocInfo LocInfo,
71 const CallLowering::ArgInfo &Info, ISD::ArgFlagsTy Flags,
72 CCState &State_) override {
73 MipsCCState &State = static_cast<MipsCCState &>(State_);
74
75 if (IsReturn)
76 State.PreAnalyzeCallResult(RetTy: Info.Ty, Func);
77 else
78 State.PreAnalyzeFormalArgument(ArgTy: Info.Ty, Flags);
79
80 return CallLowering::IncomingValueAssigner::assignArg(
81 ValNo, OrigVT, ValVT, LocVT, LocInfo, Info, Flags, State);
82 }
83};
84
85class MipsIncomingValueHandler : public CallLowering::IncomingValueHandler {
86 const MipsSubtarget &STI;
87
88public:
89 MipsIncomingValueHandler(MachineIRBuilder &MIRBuilder,
90 MachineRegisterInfo &MRI)
91 : IncomingValueHandler(MIRBuilder, MRI),
92 STI(MIRBuilder.getMF().getSubtarget<MipsSubtarget>()) {}
93
94private:
95 void assignValueToReg(Register ValVReg, Register PhysReg,
96 const CCValAssign &VA) override;
97
98 Register getStackAddress(uint64_t Size, int64_t Offset,
99 MachinePointerInfo &MPO,
100 ISD::ArgFlagsTy Flags) override;
101 void assignValueToAddress(Register ValVReg, Register Addr, LLT MemTy,
102 const MachinePointerInfo &MPO,
103 const CCValAssign &VA) override;
104
105 unsigned assignCustomValue(CallLowering::ArgInfo &Arg,
106 ArrayRef<CCValAssign> VAs,
107 std::function<void()> *Thunk = nullptr) override;
108
109 virtual void markPhysRegUsed(unsigned PhysReg) {
110 MIRBuilder.getMRI()->addLiveIn(Reg: PhysReg);
111 MIRBuilder.getMBB().addLiveIn(PhysReg);
112 }
113};
114
115class CallReturnHandler : public MipsIncomingValueHandler {
116public:
117 CallReturnHandler(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI,
118 MachineInstrBuilder &MIB)
119 : MipsIncomingValueHandler(MIRBuilder, MRI), MIB(MIB) {}
120
121private:
122 void markPhysRegUsed(unsigned PhysReg) override {
123 MIB.addDef(RegNo: PhysReg, Flags: RegState::Implicit);
124 }
125
126 MachineInstrBuilder &MIB;
127};
128
129} // end anonymous namespace
130
131void MipsIncomingValueHandler::assignValueToReg(Register ValVReg,
132 Register PhysReg,
133 const CCValAssign &VA) {
134 markPhysRegUsed(PhysReg);
135 IncomingValueHandler::assignValueToReg(ValVReg, PhysReg, VA);
136}
137
138Register MipsIncomingValueHandler::getStackAddress(uint64_t Size,
139 int64_t Offset,
140 MachinePointerInfo &MPO,
141 ISD::ArgFlagsTy Flags) {
142
143 MachineFunction &MF = MIRBuilder.getMF();
144 MachineFrameInfo &MFI = MF.getFrameInfo();
145
146 // FIXME: This should only be immutable for non-byval memory arguments.
147 int FI = MFI.CreateFixedObject(Size, SPOffset: Offset, IsImmutable: true);
148 MPO = MachinePointerInfo::getFixedStack(MF&: MIRBuilder.getMF(), FI);
149
150 return MIRBuilder.buildFrameIndex(Res: LLT::pointer(AddressSpace: 0, SizeInBits: 32), Idx: FI).getReg(Idx: 0);
151}
152
153void MipsIncomingValueHandler::assignValueToAddress(
154 Register ValVReg, Register Addr, LLT MemTy, const MachinePointerInfo &MPO,
155 const CCValAssign &VA) {
156 MachineFunction &MF = MIRBuilder.getMF();
157 auto MMO = MF.getMachineMemOperand(PtrInfo: MPO, f: MachineMemOperand::MOLoad, MemTy,
158 base_alignment: inferAlignFromPtrInfo(MF, MPO));
159 MIRBuilder.buildLoad(Res: ValVReg, Addr, MMO&: *MMO);
160}
161
162/// Handle cases when f64 is split into 2 32-bit GPRs. This is a custom
163/// assignment because generic code assumes getNumRegistersForCallingConv is
164/// accurate. In this case it is not because the type/number are context
165/// dependent on other arguments.
166unsigned
167MipsIncomingValueHandler::assignCustomValue(CallLowering::ArgInfo &Arg,
168 ArrayRef<CCValAssign> VAs,
169 std::function<void()> *Thunk) {
170 const CCValAssign &VALo = VAs[0];
171 const CCValAssign &VAHi = VAs[1];
172
173 assert(VALo.getLocVT() == MVT::i32 && VAHi.getLocVT() == MVT::i32 &&
174 VALo.getValVT() == MVT::f64 && VAHi.getValVT() == MVT::f64 &&
175 "unexpected custom value");
176
177 auto CopyLo = MIRBuilder.buildCopy(Res: LLT::scalar(SizeInBits: 32), Op: VALo.getLocReg());
178 auto CopyHi = MIRBuilder.buildCopy(Res: LLT::scalar(SizeInBits: 32), Op: VAHi.getLocReg());
179 if (!STI.isLittle())
180 std::swap(a&: CopyLo, b&: CopyHi);
181
182 Arg.OrigRegs.assign(in_start: Arg.Regs.begin(), in_end: Arg.Regs.end());
183 Arg.Regs = { CopyLo.getReg(Idx: 0), CopyHi.getReg(Idx: 0) };
184 MIRBuilder.buildMergeLikeInstr(Res: Arg.OrigRegs[0], Ops: {CopyLo, CopyHi});
185
186 markPhysRegUsed(PhysReg: VALo.getLocReg());
187 markPhysRegUsed(PhysReg: VAHi.getLocReg());
188 return 2;
189}
190
191namespace {
192class MipsOutgoingValueHandler : public CallLowering::OutgoingValueHandler {
193 const MipsSubtarget &STI;
194
195public:
196 MipsOutgoingValueHandler(MachineIRBuilder &MIRBuilder,
197 MachineRegisterInfo &MRI, MachineInstrBuilder &MIB)
198 : OutgoingValueHandler(MIRBuilder, MRI),
199 STI(MIRBuilder.getMF().getSubtarget<MipsSubtarget>()), MIB(MIB) {}
200
201private:
202 void assignValueToReg(Register ValVReg, Register PhysReg,
203 const CCValAssign &VA) override;
204
205 Register getStackAddress(uint64_t Size, int64_t Offset,
206 MachinePointerInfo &MPO,
207 ISD::ArgFlagsTy Flags) override;
208
209 void assignValueToAddress(Register ValVReg, Register Addr, LLT MemTy,
210 const MachinePointerInfo &MPO,
211 const CCValAssign &VA) override;
212 unsigned assignCustomValue(CallLowering::ArgInfo &Arg,
213 ArrayRef<CCValAssign> VAs,
214 std::function<void()> *Thunk) override;
215
216 MachineInstrBuilder &MIB;
217};
218} // end anonymous namespace
219
220void MipsOutgoingValueHandler::assignValueToReg(Register ValVReg,
221 Register PhysReg,
222 const CCValAssign &VA) {
223 Register ExtReg = extendRegister(ValReg: ValVReg, VA);
224 MIRBuilder.buildCopy(Res: PhysReg, Op: ExtReg);
225 MIB.addUse(RegNo: PhysReg, Flags: RegState::Implicit);
226}
227
228Register MipsOutgoingValueHandler::getStackAddress(uint64_t Size,
229 int64_t Offset,
230 MachinePointerInfo &MPO,
231 ISD::ArgFlagsTy Flags) {
232 MachineFunction &MF = MIRBuilder.getMF();
233 MPO = MachinePointerInfo::getStack(MF, Offset);
234
235 LLT p0 = LLT::pointer(AddressSpace: 0, SizeInBits: 32);
236 LLT s32 = LLT::scalar(SizeInBits: 32);
237 auto SPReg = MIRBuilder.buildCopy(Res: p0, Op: Register(Mips::SP));
238
239 auto OffsetReg = MIRBuilder.buildConstant(Res: s32, Val: Offset);
240 auto AddrReg = MIRBuilder.buildPtrAdd(Res: p0, Op0: SPReg, Op1: OffsetReg);
241 return AddrReg.getReg(Idx: 0);
242}
243
244void MipsOutgoingValueHandler::assignValueToAddress(
245 Register ValVReg, Register Addr, LLT MemTy, const MachinePointerInfo &MPO,
246 const CCValAssign &VA) {
247 MachineFunction &MF = MIRBuilder.getMF();
248 uint64_t LocMemOffset = VA.getLocMemOffset();
249
250 auto MMO = MF.getMachineMemOperand(
251 PtrInfo: MPO, f: MachineMemOperand::MOStore, MemTy,
252 base_alignment: commonAlignment(A: STI.getStackAlignment(), Offset: LocMemOffset));
253
254 Register ExtReg = extendRegister(ValReg: ValVReg, VA);
255 MIRBuilder.buildStore(Val: ExtReg, Addr, MMO&: *MMO);
256}
257
258unsigned
259MipsOutgoingValueHandler::assignCustomValue(CallLowering::ArgInfo &Arg,
260 ArrayRef<CCValAssign> VAs,
261 std::function<void()> *Thunk) {
262 const CCValAssign &VALo = VAs[0];
263 const CCValAssign &VAHi = VAs[1];
264
265 assert(VALo.getLocVT() == MVT::i32 && VAHi.getLocVT() == MVT::i32 &&
266 VALo.getValVT() == MVT::f64 && VAHi.getValVT() == MVT::f64 &&
267 "unexpected custom value");
268
269 auto Unmerge =
270 MIRBuilder.buildUnmerge(Res: {LLT::scalar(SizeInBits: 32), LLT::scalar(SizeInBits: 32)}, Op: Arg.Regs[0]);
271 Register Lo = Unmerge.getReg(Idx: 0);
272 Register Hi = Unmerge.getReg(Idx: 1);
273
274 Arg.OrigRegs.assign(in_start: Arg.Regs.begin(), in_end: Arg.Regs.end());
275 Arg.Regs = { Lo, Hi };
276 if (!STI.isLittle())
277 std::swap(a&: Lo, b&: Hi);
278
279 // If we can return a thunk, just include the register copies. The unmerge can
280 // be emitted earlier.
281 if (Thunk) {
282 *Thunk = [=]() {
283 MIRBuilder.buildCopy(Res: VALo.getLocReg(), Op: Lo);
284 MIRBuilder.buildCopy(Res: VAHi.getLocReg(), Op: Hi);
285 };
286 return 2;
287 }
288 MIRBuilder.buildCopy(Res: VALo.getLocReg(), Op: Lo);
289 MIRBuilder.buildCopy(Res: VAHi.getLocReg(), Op: Hi);
290 return 2;
291}
292
293static bool isSupportedArgumentType(Type *T) {
294 if (T->isIntegerTy())
295 return true;
296 if (T->isPointerTy())
297 return true;
298 if (T->isFloatingPointTy())
299 return true;
300 return false;
301}
302
303static bool isSupportedReturnType(Type *T) {
304 if (T->isIntegerTy())
305 return true;
306 if (T->isPointerTy())
307 return true;
308 if (T->isFloatingPointTy())
309 return true;
310 if (T->isAggregateType())
311 return true;
312 return false;
313}
314
315bool MipsCallLowering::lowerReturn(MachineIRBuilder &MIRBuilder,
316 const Value *Val, ArrayRef<Register> VRegs,
317 FunctionLoweringInfo &FLI) const {
318
319 MachineInstrBuilder Ret = MIRBuilder.buildInstrNoInsert(Opcode: Mips::RetRA);
320
321 if (Val != nullptr && !isSupportedReturnType(T: Val->getType()))
322 return false;
323
324 if (!VRegs.empty()) {
325 MachineFunction &MF = MIRBuilder.getMF();
326 const Function &F = MF.getFunction();
327 const DataLayout &DL = MF.getDataLayout();
328 const MipsTargetLowering &TLI = *getTLI<MipsTargetLowering>();
329
330 SmallVector<ArgInfo, 8> RetInfos;
331
332 ArgInfo ArgRetInfo(VRegs, *Val, 0);
333 setArgFlags(Arg&: ArgRetInfo, OpIdx: AttributeList::ReturnIndex, DL, FuncInfo: F);
334 splitToValueTypes(OrigArgInfo: ArgRetInfo, SplitArgs&: RetInfos, DL, CallConv: F.getCallingConv());
335
336 SmallVector<CCValAssign, 16> ArgLocs;
337
338 MipsCCState CCInfo(F.getCallingConv(), F.isVarArg(), MF, ArgLocs,
339 F.getContext());
340
341 MipsOutgoingValueHandler RetHandler(MIRBuilder, MF.getRegInfo(), Ret);
342 std::string FuncName = F.getName().str();
343 MipsOutgoingValueAssigner Assigner(TLI.CCAssignFnForReturn(),
344 FuncName.c_str(), /*IsReturn*/ true);
345
346 if (!determineAssignments(Assigner, Args&: RetInfos, CCInfo))
347 return false;
348
349 if (!handleAssignments(Handler&: RetHandler, Args&: RetInfos, CCState&: CCInfo, ArgLocs, MIRBuilder))
350 return false;
351 }
352
353 MIRBuilder.insertInstr(MIB: Ret);
354 return true;
355}
356
357bool MipsCallLowering::lowerFormalArguments(MachineIRBuilder &MIRBuilder,
358 const Function &F,
359 ArrayRef<ArrayRef<Register>> VRegs,
360 FunctionLoweringInfo &FLI) const {
361
362 // Quick exit if there aren't any args.
363 if (F.arg_empty())
364 return true;
365
366 for (auto &Arg : F.args()) {
367 if (!isSupportedArgumentType(T: Arg.getType()))
368 return false;
369 }
370
371 MachineFunction &MF = MIRBuilder.getMF();
372 const DataLayout &DL = MF.getDataLayout();
373 const MipsTargetLowering &TLI = *getTLI<MipsTargetLowering>();
374
375 SmallVector<ArgInfo, 8> ArgInfos;
376 unsigned i = 0;
377 for (auto &Arg : F.args()) {
378 ArgInfo AInfo(VRegs[i], Arg, i);
379 setArgFlags(Arg&: AInfo, OpIdx: i + AttributeList::FirstArgIndex, DL, FuncInfo: F);
380
381 splitToValueTypes(OrigArgInfo: AInfo, SplitArgs&: ArgInfos, DL, CallConv: F.getCallingConv());
382 ++i;
383 }
384
385 SmallVector<CCValAssign, 16> ArgLocs;
386 MipsCCState CCInfo(F.getCallingConv(), F.isVarArg(), MF, ArgLocs,
387 F.getContext());
388
389 const MipsTargetMachine &TM =
390 static_cast<const MipsTargetMachine &>(MF.getTarget());
391 const MipsABIInfo &ABI = TM.getABI();
392 CCInfo.AllocateStack(Size: ABI.GetCalleeAllocdArgSizeInBytes(CC: F.getCallingConv()),
393 Alignment: Align(1));
394
395 const std::string FuncName = F.getName().str();
396 MipsIncomingValueAssigner Assigner(TLI.CCAssignFnForCall(), FuncName.c_str(),
397 /*IsReturn*/ false);
398 if (!determineAssignments(Assigner, Args&: ArgInfos, CCInfo))
399 return false;
400
401 MipsIncomingValueHandler Handler(MIRBuilder, MF.getRegInfo());
402 if (!handleAssignments(Handler, Args&: ArgInfos, CCState&: CCInfo, ArgLocs, MIRBuilder))
403 return false;
404
405 if (F.isVarArg()) {
406 ArrayRef<MCPhysReg> ArgRegs =
407 ABI.getVarArgRegs(isGP64bit: MF.getSubtarget<MipsSubtarget>().isGP64bit());
408 unsigned Idx = CCInfo.getFirstUnallocated(Regs: ArgRegs);
409
410 int VaArgOffset;
411 unsigned RegSize = 4;
412 if (ArgRegs.size() == Idx)
413 VaArgOffset = alignTo(Value: CCInfo.getStackSize(), Align: RegSize);
414 else {
415 VaArgOffset =
416 (int)ABI.GetCalleeAllocdArgSizeInBytes(CC: CCInfo.getCallingConv()) -
417 (int)(RegSize * (ArgRegs.size() - Idx));
418 }
419
420 MachineFrameInfo &MFI = MF.getFrameInfo();
421 int FI = MFI.CreateFixedObject(Size: RegSize, SPOffset: VaArgOffset, IsImmutable: true);
422 MF.getInfo<MipsFunctionInfo>()->setVarArgsFrameIndex(FI);
423
424 for (unsigned I = Idx; I < ArgRegs.size(); ++I, VaArgOffset += RegSize) {
425 MIRBuilder.getMBB().addLiveIn(PhysReg: ArgRegs[I]);
426 LLT RegTy = LLT::scalar(SizeInBits: RegSize * 8);
427 MachineInstrBuilder Copy =
428 MIRBuilder.buildCopy(Res: RegTy, Op: Register(ArgRegs[I]));
429 FI = MFI.CreateFixedObject(Size: RegSize, SPOffset: VaArgOffset, IsImmutable: true);
430 MachinePointerInfo MPO = MachinePointerInfo::getFixedStack(MF, FI);
431
432 const LLT PtrTy = LLT::pointer(AddressSpace: MPO.getAddrSpace(), SizeInBits: 32);
433 auto FrameIndex = MIRBuilder.buildFrameIndex(Res: PtrTy, Idx: FI);
434 MachineMemOperand *MMO = MF.getMachineMemOperand(
435 PtrInfo: MPO, f: MachineMemOperand::MOStore, MemTy: RegTy, base_alignment: Align(RegSize));
436 MIRBuilder.buildStore(Val: Copy, Addr: FrameIndex, MMO&: *MMO);
437 }
438 }
439
440 return true;
441}
442
443bool MipsCallLowering::lowerCall(MachineIRBuilder &MIRBuilder,
444 CallLoweringInfo &Info) const {
445
446 if (Info.CallConv != CallingConv::C)
447 return false;
448
449 for (auto &Arg : Info.OrigArgs) {
450 if (!isSupportedArgumentType(T: Arg.Ty))
451 return false;
452 if (Arg.Flags[0].isByVal())
453 return false;
454 if (Arg.Flags[0].isSRet() && !Arg.Ty->isPointerTy())
455 return false;
456 }
457
458 if (!Info.OrigRet.Ty->isVoidTy() && !isSupportedReturnType(T: Info.OrigRet.Ty))
459 return false;
460
461 MachineFunction &MF = MIRBuilder.getMF();
462 const Function &F = MF.getFunction();
463 const DataLayout &DL = MF.getDataLayout();
464 const MipsTargetLowering &TLI = *getTLI<MipsTargetLowering>();
465 const MipsTargetMachine &TM =
466 static_cast<const MipsTargetMachine &>(MF.getTarget());
467 const MipsABIInfo &ABI = TM.getABI();
468
469 MachineInstrBuilder CallSeqStart =
470 MIRBuilder.buildInstr(Opcode: Mips::ADJCALLSTACKDOWN);
471
472 const bool IsCalleeGlobalPIC =
473 Info.Callee.isGlobal() && TM.isPositionIndependent();
474
475 MachineInstrBuilder MIB = MIRBuilder.buildInstrNoInsert(
476 Opcode: Info.Callee.isReg() || IsCalleeGlobalPIC ? Mips::JALRPseudo : Mips::JAL);
477 MIB.addDef(RegNo: Mips::SP, Flags: RegState::Implicit);
478 if (IsCalleeGlobalPIC) {
479 Register CalleeReg =
480 MF.getRegInfo().createGenericVirtualRegister(Ty: LLT::pointer(AddressSpace: 0, SizeInBits: 32));
481 MachineInstr *CalleeGlobalValue =
482 MIRBuilder.buildGlobalValue(Res: CalleeReg, GV: Info.Callee.getGlobal());
483 if (!Info.Callee.getGlobal()->hasLocalLinkage())
484 CalleeGlobalValue->getOperand(i: 1).setTargetFlags(MipsII::MO_GOT_CALL);
485 MIB.addUse(RegNo: CalleeReg);
486 } else
487 MIB.add(MO: Info.Callee);
488 const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
489 MIB.addRegMask(Mask: TRI->getCallPreservedMask(MF, Info.CallConv));
490
491 TargetLowering::ArgListTy FuncOrigArgs;
492 FuncOrigArgs.reserve(n: Info.OrigArgs.size());
493
494 SmallVector<ArgInfo, 8> ArgInfos;
495 for (auto &Arg : Info.OrigArgs)
496 splitToValueTypes(OrigArgInfo: Arg, SplitArgs&: ArgInfos, DL, CallConv: Info.CallConv);
497
498 SmallVector<CCValAssign, 8> ArgLocs;
499 bool IsCalleeVarArg = false;
500 if (Info.Callee.isGlobal()) {
501 const Function *CF = static_cast<const Function *>(Info.Callee.getGlobal());
502 IsCalleeVarArg = CF->isVarArg();
503 }
504
505 // FIXME: Should use MipsCCState::getSpecialCallingConvForCallee, but it
506 // depends on looking directly at the call target.
507 MipsCCState CCInfo(Info.CallConv, IsCalleeVarArg, MF, ArgLocs,
508 F.getContext());
509
510 CCInfo.AllocateStack(Size: ABI.GetCalleeAllocdArgSizeInBytes(CC: Info.CallConv),
511 Alignment: Align(1));
512
513 const char *Call =
514 Info.Callee.isSymbol() ? Info.Callee.getSymbolName() : nullptr;
515
516 MipsOutgoingValueAssigner Assigner(TLI.CCAssignFnForCall(), Call,
517 /*IsReturn*/ false);
518 if (!determineAssignments(Assigner, Args&: ArgInfos, CCInfo))
519 return false;
520
521 MipsOutgoingValueHandler ArgHandler(MIRBuilder, MF.getRegInfo(), MIB);
522 if (!handleAssignments(Handler&: ArgHandler, Args&: ArgInfos, CCState&: CCInfo, ArgLocs, MIRBuilder))
523 return false;
524
525 unsigned StackSize = CCInfo.getStackSize();
526 unsigned StackAlignment = F.getParent()->getOverrideStackAlignment();
527 if (!StackAlignment) {
528 const TargetFrameLowering *TFL = MF.getSubtarget().getFrameLowering();
529 StackAlignment = TFL->getStackAlignment();
530 }
531 StackSize = alignTo(Value: StackSize, Align: StackAlignment);
532 CallSeqStart.addImm(Val: StackSize).addImm(Val: 0);
533
534 if (IsCalleeGlobalPIC) {
535 MIRBuilder.buildCopy(
536 Res: Register(Mips::GP),
537 Op: MF.getInfo<MipsFunctionInfo>()->getGlobalBaseRegForGlobalISel(MF));
538 MIB.addDef(RegNo: Mips::GP, Flags: RegState::Implicit);
539 }
540 MIRBuilder.insertInstr(MIB);
541 if (MIB->getOpcode() == Mips::JALRPseudo) {
542 const MipsSubtarget &STI = MIRBuilder.getMF().getSubtarget<MipsSubtarget>();
543 MIB.constrainAllUses(TII: MIRBuilder.getTII(), TRI: *STI.getRegisterInfo(),
544 RBI: *STI.getRegBankInfo());
545 }
546
547 if (!Info.OrigRet.Ty->isVoidTy()) {
548 ArgInfos.clear();
549
550 CallLowering::splitToValueTypes(OrigArgInfo: Info.OrigRet, SplitArgs&: ArgInfos, DL,
551 CallConv: F.getCallingConv());
552
553 const std::string FuncName = F.getName().str();
554 SmallVector<CCValAssign, 8> ArgLocs;
555 MipsIncomingValueAssigner Assigner(TLI.CCAssignFnForReturn(),
556 FuncName.c_str(),
557 /*IsReturn*/ true);
558 CallReturnHandler RetHandler(MIRBuilder, MF.getRegInfo(), MIB);
559
560 MipsCCState CCInfo(F.getCallingConv(), F.isVarArg(), MF, ArgLocs,
561 F.getContext());
562
563 if (!determineAssignments(Assigner, Args&: ArgInfos, CCInfo))
564 return false;
565
566 if (!handleAssignments(Handler&: RetHandler, Args&: ArgInfos, CCState&: CCInfo, ArgLocs, MIRBuilder))
567 return false;
568 }
569
570 MIRBuilder.buildInstr(Opcode: Mips::ADJCALLSTACKUP).addImm(Val: StackSize).addImm(Val: 0);
571
572 return true;
573}
574