1 //===-- MipsISelLowering.cpp - Mips 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 defines the interfaces that Mips uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "mips-lower"
16 #include "MipsISelLowering.h"
17 #include "MipsMachineFunction.h"
18 #include "MipsTargetMachine.h"
19 #include "MipsTargetObjectFile.h"
20 #include "MipsSubtarget.h"
21 #include "llvm/DerivedTypes.h"
22 #include "llvm/Function.h"
23 #include "llvm/GlobalVariable.h"
24 #include "llvm/Intrinsics.h"
25 #include "llvm/CallingConv.h"
26 #include "llvm/CodeGen/CallingConvLower.h"
27 #include "llvm/CodeGen/MachineFrameInfo.h"
28 #include "llvm/CodeGen/MachineFunction.h"
29 #include "llvm/CodeGen/MachineInstrBuilder.h"
30 #include "llvm/CodeGen/MachineRegisterInfo.h"
31 #include "llvm/CodeGen/SelectionDAGISel.h"
32 #include "llvm/CodeGen/ValueTypes.h"
33 #include "llvm/Support/Debug.h"
34 #include "llvm/Support/ErrorHandling.h"
37 const char *MipsTargetLowering::getTargetNodeName(unsigned Opcode) const {
39 case MipsISD::JmpLink : return "MipsISD::JmpLink";
40 case MipsISD::Hi : return "MipsISD::Hi";
41 case MipsISD::Lo : return "MipsISD::Lo";
42 case MipsISD::GPRel : return "MipsISD::GPRel";
43 case MipsISD::Ret : return "MipsISD::Ret";
44 case MipsISD::SelectCC : return "MipsISD::SelectCC";
45 case MipsISD::FPSelectCC : return "MipsISD::FPSelectCC";
46 case MipsISD::FPBrcond : return "MipsISD::FPBrcond";
47 case MipsISD::FPCmp : return "MipsISD::FPCmp";
48 case MipsISD::FPRound : return "MipsISD::FPRound";
49 case MipsISD::MAdd : return "MipsISD::MAdd";
50 case MipsISD::MAddu : return "MipsISD::MAddu";
51 case MipsISD::MSub : return "MipsISD::MSub";
52 case MipsISD::MSubu : return "MipsISD::MSubu";
53 default : return NULL;
58 MipsTargetLowering(MipsTargetMachine &TM)
59 : TargetLowering(TM, new MipsTargetObjectFile()) {
60 Subtarget = &TM.getSubtarget<MipsSubtarget>();
62 // Mips does not have i1 type, so use i32 for
63 // setcc operations results (slt, sgt, ...).
64 setBooleanContents(ZeroOrOneBooleanContent);
66 // Set up the register classes
67 addRegisterClass(MVT::i32, Mips::CPURegsRegisterClass);
68 addRegisterClass(MVT::f32, Mips::FGR32RegisterClass);
70 // When dealing with single precision only, use libcalls
71 if (!Subtarget->isSingleFloat())
72 if (!Subtarget->isFP64bit())
73 addRegisterClass(MVT::f64, Mips::AFGR64RegisterClass);
75 // Load extented operations for i1 types must be promoted
76 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
77 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
78 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
80 // MIPS doesn't have extending float->double load/store
81 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
82 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
84 // Used by legalize types to correctly generate the setcc result.
85 // Without this, every float setcc comes with a AND/OR with the result,
86 // we don't want this, since the fpcmp result goes to a flag register,
87 // which is used implicitly by brcond and select operations.
88 AddPromotedToType(ISD::SETCC, MVT::i1, MVT::i32);
90 // Mips Custom Operations
91 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
92 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
93 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
94 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
95 setOperationAction(ISD::SELECT, MVT::f32, Custom);
96 setOperationAction(ISD::SELECT, MVT::f64, Custom);
97 setOperationAction(ISD::SELECT, MVT::i32, Custom);
98 setOperationAction(ISD::SETCC, MVT::f32, Custom);
99 setOperationAction(ISD::SETCC, MVT::f64, Custom);
100 setOperationAction(ISD::BRCOND, MVT::Other, Custom);
101 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Custom);
102 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
103 setOperationAction(ISD::VASTART, MVT::Other, Custom);
106 // We custom lower AND/OR to handle the case where the DAG contain 'ands/ors'
107 // with operands comming from setcc fp comparions. This is necessary since
108 // the result from these setcc are in a flag registers (FCR31).
109 setOperationAction(ISD::AND, MVT::i32, Custom);
110 setOperationAction(ISD::OR, MVT::i32, Custom);
112 // Operations not directly supported by Mips.
113 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
114 setOperationAction(ISD::BR_CC, MVT::Other, Expand);
115 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
116 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
117 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
118 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
119 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
120 setOperationAction(ISD::CTTZ, MVT::i32, Expand);
121 setOperationAction(ISD::ROTL, MVT::i32, Expand);
123 if (!Subtarget->isMips32r2())
124 setOperationAction(ISD::ROTR, MVT::i32, Expand);
126 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
127 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
128 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
129 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
130 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
131 setOperationAction(ISD::FSIN, MVT::f32, Expand);
132 setOperationAction(ISD::FSIN, MVT::f64, Expand);
133 setOperationAction(ISD::FCOS, MVT::f32, Expand);
134 setOperationAction(ISD::FCOS, MVT::f64, Expand);
135 setOperationAction(ISD::FPOWI, MVT::f32, Expand);
136 setOperationAction(ISD::FPOW, MVT::f32, Expand);
137 setOperationAction(ISD::FLOG, MVT::f32, Expand);
138 setOperationAction(ISD::FLOG2, MVT::f32, Expand);
139 setOperationAction(ISD::FLOG10, MVT::f32, Expand);
140 setOperationAction(ISD::FEXP, MVT::f32, Expand);
142 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
144 // Use the default for now
145 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
146 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
147 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
149 if (Subtarget->isSingleFloat())
150 setOperationAction(ISD::SELECT_CC, MVT::f64, Expand);
152 if (!Subtarget->hasSEInReg()) {
153 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
154 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
157 if (!Subtarget->hasBitCount())
158 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
160 if (!Subtarget->hasSwap())
161 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
163 setTargetDAGCombine(ISD::ADDE);
164 setTargetDAGCombine(ISD::SUBE);
166 setStackPointerRegisterToSaveRestore(Mips::SP);
167 computeRegisterProperties();
170 MVT::SimpleValueType MipsTargetLowering::getSetCCResultType(EVT VT) const {
174 /// getFunctionAlignment - Return the Log2 alignment of this function.
175 unsigned MipsTargetLowering::getFunctionAlignment(const Function *) const {
180 // Transforms a subgraph in CurDAG if the following pattern is found:
181 // (addc multLo, Lo0), (adde multHi, Hi0),
183 // multHi/Lo: product of multiplication
184 // Lo0: initial value of Lo register
185 // Hi0: initial value of Hi register
186 // Return true if mattern matching was successful.
187 static bool SelectMadd(SDNode* ADDENode, SelectionDAG* CurDAG) {
188 // ADDENode's second operand must be a flag output of an ADDC node in order
189 // for the matching to be successful.
190 SDNode* ADDCNode = ADDENode->getOperand(2).getNode();
192 if (ADDCNode->getOpcode() != ISD::ADDC)
195 SDValue MultHi = ADDENode->getOperand(0);
196 SDValue MultLo = ADDCNode->getOperand(0);
197 SDNode* MultNode = MultHi.getNode();
198 unsigned MultOpc = MultHi.getOpcode();
200 // MultHi and MultLo must be generated by the same node,
201 if (MultLo.getNode() != MultNode)
204 // and it must be a multiplication.
205 if (MultOpc != ISD::SMUL_LOHI && MultOpc != ISD::UMUL_LOHI)
208 // MultLo amd MultHi must be the first and second output of MultNode
210 if (MultHi.getResNo() != 1 || MultLo.getResNo() != 0)
213 // Transform this to a MADD only if ADDENode and ADDCNode are the only users
214 // of the values of MultNode, in which case MultNode will be removed in later
216 // If there exist users other than ADDENode or ADDCNode, this function returns
217 // here, which will result in MultNode being mapped to a single MULT
218 // instruction node rather than a pair of MULT and MADD instructions being
220 if (!MultHi.hasOneUse() || !MultLo.hasOneUse())
223 SDValue Chain = CurDAG->getEntryNode();
224 DebugLoc dl = ADDENode->getDebugLoc();
226 // create MipsMAdd(u) node
227 MultOpc = MultOpc == ISD::UMUL_LOHI ? MipsISD::MAddu : MipsISD::MAdd;
229 SDValue MAdd = CurDAG->getNode(MultOpc, dl,
231 MultNode->getOperand(0),// Factor 0
232 MultNode->getOperand(1),// Factor 1
233 ADDCNode->getOperand(1),// Lo0
234 ADDENode->getOperand(1));// Hi0
236 // create CopyFromReg nodes
237 SDValue CopyFromLo = CurDAG->getCopyFromReg(Chain, dl, Mips::LO, MVT::i32,
239 SDValue CopyFromHi = CurDAG->getCopyFromReg(CopyFromLo.getValue(1), dl,
241 CopyFromLo.getValue(2));
243 // replace uses of adde and addc here
244 if (!SDValue(ADDCNode, 0).use_empty())
245 CurDAG->ReplaceAllUsesOfValueWith(SDValue(ADDCNode, 0), CopyFromLo);
247 if (!SDValue(ADDENode, 0).use_empty())
248 CurDAG->ReplaceAllUsesOfValueWith(SDValue(ADDENode, 0), CopyFromHi);
254 // Transforms a subgraph in CurDAG if the following pattern is found:
255 // (addc Lo0, multLo), (sube Hi0, multHi),
257 // multHi/Lo: product of multiplication
258 // Lo0: initial value of Lo register
259 // Hi0: initial value of Hi register
260 // Return true if mattern matching was successful.
261 static bool SelectMsub(SDNode* SUBENode, SelectionDAG* CurDAG) {
262 // SUBENode's second operand must be a flag output of an SUBC node in order
263 // for the matching to be successful.
264 SDNode* SUBCNode = SUBENode->getOperand(2).getNode();
266 if (SUBCNode->getOpcode() != ISD::SUBC)
269 SDValue MultHi = SUBENode->getOperand(1);
270 SDValue MultLo = SUBCNode->getOperand(1);
271 SDNode* MultNode = MultHi.getNode();
272 unsigned MultOpc = MultHi.getOpcode();
274 // MultHi and MultLo must be generated by the same node,
275 if (MultLo.getNode() != MultNode)
278 // and it must be a multiplication.
279 if (MultOpc != ISD::SMUL_LOHI && MultOpc != ISD::UMUL_LOHI)
282 // MultLo amd MultHi must be the first and second output of MultNode
284 if (MultHi.getResNo() != 1 || MultLo.getResNo() != 0)
287 // Transform this to a MSUB only if SUBENode and SUBCNode are the only users
288 // of the values of MultNode, in which case MultNode will be removed in later
290 // If there exist users other than SUBENode or SUBCNode, this function returns
291 // here, which will result in MultNode being mapped to a single MULT
292 // instruction node rather than a pair of MULT and MSUB instructions being
294 if (!MultHi.hasOneUse() || !MultLo.hasOneUse())
297 SDValue Chain = CurDAG->getEntryNode();
298 DebugLoc dl = SUBENode->getDebugLoc();
300 // create MipsSub(u) node
301 MultOpc = MultOpc == ISD::UMUL_LOHI ? MipsISD::MSubu : MipsISD::MSub;
303 SDValue MSub = CurDAG->getNode(MultOpc, dl,
305 MultNode->getOperand(0),// Factor 0
306 MultNode->getOperand(1),// Factor 1
307 SUBCNode->getOperand(0),// Lo0
308 SUBENode->getOperand(0));// Hi0
310 // create CopyFromReg nodes
311 SDValue CopyFromLo = CurDAG->getCopyFromReg(Chain, dl, Mips::LO, MVT::i32,
313 SDValue CopyFromHi = CurDAG->getCopyFromReg(CopyFromLo.getValue(1), dl,
315 CopyFromLo.getValue(2));
317 // replace uses of sube and subc here
318 if (!SDValue(SUBCNode, 0).use_empty())
319 CurDAG->ReplaceAllUsesOfValueWith(SDValue(SUBCNode, 0), CopyFromLo);
321 if (!SDValue(SUBENode, 0).use_empty())
322 CurDAG->ReplaceAllUsesOfValueWith(SDValue(SUBENode, 0), CopyFromHi);
327 static SDValue PerformADDECombine(SDNode *N, SelectionDAG& DAG,
328 TargetLowering::DAGCombinerInfo &DCI,
329 const MipsSubtarget* Subtarget) {
330 if (DCI.isBeforeLegalize())
333 if (Subtarget->isMips32() && SelectMadd(N, &DAG))
334 return SDValue(N, 0);
339 static SDValue PerformSUBECombine(SDNode *N, SelectionDAG& DAG,
340 TargetLowering::DAGCombinerInfo &DCI,
341 const MipsSubtarget* Subtarget) {
342 if (DCI.isBeforeLegalize())
345 if (Subtarget->isMips32() && SelectMsub(N, &DAG))
346 return SDValue(N, 0);
351 SDValue MipsTargetLowering::PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI)
353 SelectionDAG &DAG = DCI.DAG;
354 unsigned opc = N->getOpcode();
359 return PerformADDECombine(N, DAG, DCI, Subtarget);
361 return PerformSUBECombine(N, DAG, DCI, Subtarget);
367 SDValue MipsTargetLowering::
368 LowerOperation(SDValue Op, SelectionDAG &DAG) const
370 switch (Op.getOpcode())
372 case ISD::AND: return LowerANDOR(Op, DAG);
373 case ISD::BRCOND: return LowerBRCOND(Op, DAG);
374 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
375 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
376 case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
377 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
378 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
379 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
380 case ISD::OR: return LowerANDOR(Op, DAG);
381 case ISD::SELECT: return LowerSELECT(Op, DAG);
382 case ISD::SETCC: return LowerSETCC(Op, DAG);
383 case ISD::VASTART: return LowerVASTART(Op, DAG);
388 //===----------------------------------------------------------------------===//
389 // Lower helper functions
390 //===----------------------------------------------------------------------===//
392 // AddLiveIn - This helper function adds the specified physical register to the
393 // MachineFunction as a live in value. It also creates a corresponding
394 // virtual register for it.
396 AddLiveIn(MachineFunction &MF, unsigned PReg, TargetRegisterClass *RC)
398 assert(RC->contains(PReg) && "Not the correct regclass!");
399 unsigned VReg = MF.getRegInfo().createVirtualRegister(RC);
400 MF.getRegInfo().addLiveIn(PReg, VReg);
404 // Get fp branch code (not opcode) from condition code.
405 static Mips::FPBranchCode GetFPBranchCodeFromCond(Mips::CondCode CC) {
406 if (CC >= Mips::FCOND_F && CC <= Mips::FCOND_NGT)
407 return Mips::BRANCH_T;
409 if (CC >= Mips::FCOND_T && CC <= Mips::FCOND_GT)
410 return Mips::BRANCH_F;
412 return Mips::BRANCH_INVALID;
415 static unsigned FPBranchCodeToOpc(Mips::FPBranchCode BC) {
418 llvm_unreachable("Unknown branch code");
419 case Mips::BRANCH_T : return Mips::BC1T;
420 case Mips::BRANCH_F : return Mips::BC1F;
421 case Mips::BRANCH_TL : return Mips::BC1TL;
422 case Mips::BRANCH_FL : return Mips::BC1FL;
426 static Mips::CondCode FPCondCCodeToFCC(ISD::CondCode CC) {
428 default: llvm_unreachable("Unknown fp condition code!");
430 case ISD::SETOEQ: return Mips::FCOND_EQ;
431 case ISD::SETUNE: return Mips::FCOND_OGL;
433 case ISD::SETOLT: return Mips::FCOND_OLT;
435 case ISD::SETOGT: return Mips::FCOND_OGT;
437 case ISD::SETOLE: return Mips::FCOND_OLE;
439 case ISD::SETOGE: return Mips::FCOND_OGE;
440 case ISD::SETULT: return Mips::FCOND_ULT;
441 case ISD::SETULE: return Mips::FCOND_ULE;
442 case ISD::SETUGT: return Mips::FCOND_UGT;
443 case ISD::SETUGE: return Mips::FCOND_UGE;
444 case ISD::SETUO: return Mips::FCOND_UN;
445 case ISD::SETO: return Mips::FCOND_OR;
447 case ISD::SETONE: return Mips::FCOND_NEQ;
448 case ISD::SETUEQ: return Mips::FCOND_UEQ;
453 MipsTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
454 MachineBasicBlock *BB) const {
455 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
456 bool isFPCmp = false;
457 DebugLoc dl = MI->getDebugLoc();
459 switch (MI->getOpcode()) {
460 default: assert(false && "Unexpected instr type to insert");
461 case Mips::Select_FCC:
462 case Mips::Select_FCC_S32:
463 case Mips::Select_FCC_D32:
464 isFPCmp = true; // FALL THROUGH
465 case Mips::Select_CC:
466 case Mips::Select_CC_S32:
467 case Mips::Select_CC_D32: {
468 // To "insert" a SELECT_CC instruction, we actually have to insert the
469 // diamond control-flow pattern. The incoming instruction knows the
470 // destination vreg to set, the condition code register to branch on, the
471 // true/false values to select between, and a branch opcode to use.
472 const BasicBlock *LLVM_BB = BB->getBasicBlock();
473 MachineFunction::iterator It = BB;
480 // bNE r1, r0, copy1MBB
481 // fallthrough --> copy0MBB
482 MachineBasicBlock *thisMBB = BB;
483 MachineFunction *F = BB->getParent();
484 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
485 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
486 F->insert(It, copy0MBB);
487 F->insert(It, sinkMBB);
489 // Transfer the remainder of BB and its successor edges to sinkMBB.
490 sinkMBB->splice(sinkMBB->begin(), BB,
491 llvm::next(MachineBasicBlock::iterator(MI)),
493 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
495 // Next, add the true and fallthrough blocks as its successors.
496 BB->addSuccessor(copy0MBB);
497 BB->addSuccessor(sinkMBB);
499 // Emit the right instruction according to the type of the operands compared
501 // Find the condiction code present in the setcc operation.
502 Mips::CondCode CC = (Mips::CondCode)MI->getOperand(4).getImm();
503 // Get the branch opcode from the branch code.
504 unsigned Opc = FPBranchCodeToOpc(GetFPBranchCodeFromCond(CC));
505 BuildMI(BB, dl, TII->get(Opc)).addMBB(sinkMBB);
507 BuildMI(BB, dl, TII->get(Mips::BNE)).addReg(MI->getOperand(1).getReg())
508 .addReg(Mips::ZERO).addMBB(sinkMBB);
512 // # fallthrough to sinkMBB
515 // Update machine-CFG edges
516 BB->addSuccessor(sinkMBB);
519 // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ]
522 BuildMI(*BB, BB->begin(), dl,
523 TII->get(Mips::PHI), MI->getOperand(0).getReg())
524 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB)
525 .addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB);
527 MI->eraseFromParent(); // The pseudo instruction is gone now.
533 //===----------------------------------------------------------------------===//
534 // Misc Lower Operation implementation
535 //===----------------------------------------------------------------------===//
537 SDValue MipsTargetLowering::
538 LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const
540 if (!Subtarget->isMips1())
543 MachineFunction &MF = DAG.getMachineFunction();
544 unsigned CCReg = AddLiveIn(MF, Mips::FCR31, Mips::CCRRegisterClass);
546 SDValue Chain = DAG.getEntryNode();
547 DebugLoc dl = Op.getDebugLoc();
548 SDValue Src = Op.getOperand(0);
550 // Set the condition register
551 SDValue CondReg = DAG.getCopyFromReg(Chain, dl, CCReg, MVT::i32);
552 CondReg = DAG.getCopyToReg(Chain, dl, Mips::AT, CondReg);
553 CondReg = DAG.getCopyFromReg(CondReg, dl, Mips::AT, MVT::i32);
555 SDValue Cst = DAG.getConstant(3, MVT::i32);
556 SDValue Or = DAG.getNode(ISD::OR, dl, MVT::i32, CondReg, Cst);
557 Cst = DAG.getConstant(2, MVT::i32);
558 SDValue Xor = DAG.getNode(ISD::XOR, dl, MVT::i32, Or, Cst);
560 SDValue InFlag(0, 0);
561 CondReg = DAG.getCopyToReg(Chain, dl, Mips::FCR31, Xor, InFlag);
563 // Emit the round instruction and bit convert to integer
564 SDValue Trunc = DAG.getNode(MipsISD::FPRound, dl, MVT::f32,
565 Src, CondReg.getValue(1));
566 SDValue BitCvt = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Trunc);
570 SDValue MipsTargetLowering::
571 LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const
573 SDValue Chain = Op.getOperand(0);
574 SDValue Size = Op.getOperand(1);
575 DebugLoc dl = Op.getDebugLoc();
577 // Get a reference from Mips stack pointer
578 SDValue StackPointer = DAG.getCopyFromReg(Chain, dl, Mips::SP, MVT::i32);
580 // Subtract the dynamic size from the actual stack size to
581 // obtain the new stack size.
582 SDValue Sub = DAG.getNode(ISD::SUB, dl, MVT::i32, StackPointer, Size);
584 // The Sub result contains the new stack start address, so it
585 // must be placed in the stack pointer register.
586 Chain = DAG.getCopyToReg(StackPointer.getValue(1), dl, Mips::SP, Sub);
588 // This node always has two return values: a new stack pointer
590 SDValue Ops[2] = { Sub, Chain };
591 return DAG.getMergeValues(Ops, 2, dl);
594 SDValue MipsTargetLowering::
595 LowerANDOR(SDValue Op, SelectionDAG &DAG) const
597 SDValue LHS = Op.getOperand(0);
598 SDValue RHS = Op.getOperand(1);
599 DebugLoc dl = Op.getDebugLoc();
601 if (LHS.getOpcode() != MipsISD::FPCmp || RHS.getOpcode() != MipsISD::FPCmp)
604 SDValue True = DAG.getConstant(1, MVT::i32);
605 SDValue False = DAG.getConstant(0, MVT::i32);
607 SDValue LSEL = DAG.getNode(MipsISD::FPSelectCC, dl, True.getValueType(),
608 LHS, True, False, LHS.getOperand(2));
609 SDValue RSEL = DAG.getNode(MipsISD::FPSelectCC, dl, True.getValueType(),
610 RHS, True, False, RHS.getOperand(2));
612 return DAG.getNode(Op.getOpcode(), dl, MVT::i32, LSEL, RSEL);
615 SDValue MipsTargetLowering::
616 LowerBRCOND(SDValue Op, SelectionDAG &DAG) const
618 // The first operand is the chain, the second is the condition, the third is
619 // the block to branch to if the condition is true.
620 SDValue Chain = Op.getOperand(0);
621 SDValue Dest = Op.getOperand(2);
622 DebugLoc dl = Op.getDebugLoc();
624 if (Op.getOperand(1).getOpcode() != MipsISD::FPCmp)
627 SDValue CondRes = Op.getOperand(1);
628 SDValue CCNode = CondRes.getOperand(2);
630 (Mips::CondCode)cast<ConstantSDNode>(CCNode)->getZExtValue();
631 SDValue BrCode = DAG.getConstant(GetFPBranchCodeFromCond(CC), MVT::i32);
633 return DAG.getNode(MipsISD::FPBrcond, dl, Op.getValueType(), Chain, BrCode,
637 SDValue MipsTargetLowering::
638 LowerSETCC(SDValue Op, SelectionDAG &DAG) const
640 // The operands to this are the left and right operands to compare (ops #0,
641 // and #1) and the condition code to compare them with (op #2) as a
643 SDValue LHS = Op.getOperand(0);
644 SDValue RHS = Op.getOperand(1);
645 DebugLoc dl = Op.getDebugLoc();
647 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
649 return DAG.getNode(MipsISD::FPCmp, dl, Op.getValueType(), LHS, RHS,
650 DAG.getConstant(FPCondCCodeToFCC(CC), MVT::i32));
653 SDValue MipsTargetLowering::
654 LowerSELECT(SDValue Op, SelectionDAG &DAG) const
656 SDValue Cond = Op.getOperand(0);
657 SDValue True = Op.getOperand(1);
658 SDValue False = Op.getOperand(2);
659 DebugLoc dl = Op.getDebugLoc();
661 // if the incomming condition comes from a integer compare, the select
662 // operation must be SelectCC or a conditional move if the subtarget
664 if (Cond.getOpcode() != MipsISD::FPCmp) {
665 if (Subtarget->hasCondMov() && !True.getValueType().isFloatingPoint())
667 return DAG.getNode(MipsISD::SelectCC, dl, True.getValueType(),
671 // if the incomming condition comes from fpcmp, the select
672 // operation must use FPSelectCC.
673 SDValue CCNode = Cond.getOperand(2);
674 return DAG.getNode(MipsISD::FPSelectCC, dl, True.getValueType(),
675 Cond, True, False, CCNode);
678 SDValue MipsTargetLowering::LowerGlobalAddress(SDValue Op,
679 SelectionDAG &DAG) const {
680 // FIXME there isn't actually debug info here
681 DebugLoc dl = Op.getDebugLoc();
682 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
684 if (getTargetMachine().getRelocationModel() != Reloc::PIC_) {
685 SDVTList VTs = DAG.getVTList(MVT::i32);
687 MipsTargetObjectFile &TLOF = (MipsTargetObjectFile&)getObjFileLowering();
689 // %gp_rel relocation
690 if (TLOF.IsGlobalInSmallSection(GV, getTargetMachine())) {
691 SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i32, 0,
693 SDValue GPRelNode = DAG.getNode(MipsISD::GPRel, dl, VTs, &GA, 1);
694 SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(MVT::i32);
695 return DAG.getNode(ISD::ADD, dl, MVT::i32, GOT, GPRelNode);
697 // %hi/%lo relocation
698 SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i32, 0,
699 MipsII::MO_ABS_HILO);
700 SDValue HiPart = DAG.getNode(MipsISD::Hi, dl, VTs, &GA, 1);
701 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, GA);
702 return DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
705 SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i32, 0,
707 SDValue ResNode = DAG.getLoad(MVT::i32, dl,
708 DAG.getEntryNode(), GA, MachinePointerInfo(),
710 // On functions and global targets not internal linked only
711 // a load from got/GP is necessary for PIC to work.
712 if (!GV->hasLocalLinkage() || isa<Function>(GV))
714 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, GA);
715 return DAG.getNode(ISD::ADD, dl, MVT::i32, ResNode, Lo);
718 llvm_unreachable("Dont know how to handle GlobalAddress");
722 SDValue MipsTargetLowering::
723 LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const
725 llvm_unreachable("TLS not implemented for MIPS.");
726 return SDValue(); // Not reached
729 SDValue MipsTargetLowering::
730 LowerJumpTable(SDValue Op, SelectionDAG &DAG) const
734 // FIXME there isn't actually debug info here
735 DebugLoc dl = Op.getDebugLoc();
736 bool IsPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
737 unsigned char OpFlag = IsPIC ? MipsII::MO_GOT : MipsII::MO_ABS_HILO;
739 EVT PtrVT = Op.getValueType();
740 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
742 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, OpFlag);
745 SDValue Ops[] = { JTI };
746 HiPart = DAG.getNode(MipsISD::Hi, dl, DAG.getVTList(MVT::i32), Ops, 1);
747 } else // Emit Load from Global Pointer
748 HiPart = DAG.getLoad(MVT::i32, dl, DAG.getEntryNode(), JTI,
749 MachinePointerInfo(),
752 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, JTI);
753 ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
758 SDValue MipsTargetLowering::
759 LowerConstantPool(SDValue Op, SelectionDAG &DAG) const
762 ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
763 const Constant *C = N->getConstVal();
764 // FIXME there isn't actually debug info here
765 DebugLoc dl = Op.getDebugLoc();
768 // FIXME: we should reference the constant pool using small data sections,
769 // but the asm printer currently doens't support this feature without
770 // hacking it. This feature should come soon so we can uncomment the
772 //if (IsInSmallSection(C->getType())) {
773 // SDValue GPRelNode = DAG.getNode(MipsISD::GPRel, MVT::i32, CP);
774 // SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(MVT::i32);
775 // ResNode = DAG.getNode(ISD::ADD, MVT::i32, GOT, GPRelNode);
777 if (getTargetMachine().getRelocationModel() != Reloc::PIC_) {
778 SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
779 N->getOffset(), MipsII::MO_ABS_HILO);
780 SDValue HiPart = DAG.getNode(MipsISD::Hi, dl, MVT::i32, CP);
781 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, CP);
782 ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
784 SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
785 N->getOffset(), MipsII::MO_GOT);
786 SDValue Load = DAG.getLoad(MVT::i32, dl, DAG.getEntryNode(),
787 CP, MachinePointerInfo::getConstantPool(),
789 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, CP);
790 ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, Load, Lo);
796 SDValue MipsTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
797 MachineFunction &MF = DAG.getMachineFunction();
798 MipsFunctionInfo *FuncInfo = MF.getInfo<MipsFunctionInfo>();
800 DebugLoc dl = Op.getDebugLoc();
801 SDValue FI = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(),
804 // vastart just stores the address of the VarArgsFrameIndex slot into the
805 // memory location argument.
806 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
807 return DAG.getStore(Op.getOperand(0), dl, FI, Op.getOperand(1),
808 MachinePointerInfo(SV),
812 //===----------------------------------------------------------------------===//
813 // Calling Convention Implementation
814 //===----------------------------------------------------------------------===//
816 #include "MipsGenCallingConv.inc"
818 //===----------------------------------------------------------------------===//
819 // TODO: Implement a generic logic using tblgen that can support this.
820 // Mips O32 ABI rules:
822 // i32 - Passed in A0, A1, A2, A3 and stack
823 // f32 - Only passed in f32 registers if no int reg has been used yet to hold
824 // an argument. Otherwise, passed in A1, A2, A3 and stack.
825 // f64 - Only passed in two aliased f32 registers if no int reg has been used
826 // yet to hold an argument. Otherwise, use A2, A3 and stack. If A1 is
827 // not used, it must be shadowed. If only A3 is avaiable, shadow it and
829 //===----------------------------------------------------------------------===//
831 static bool CC_MipsO32(unsigned ValNo, MVT ValVT,
832 MVT LocVT, CCValAssign::LocInfo LocInfo,
833 ISD::ArgFlagsTy ArgFlags, CCState &State) {
835 static const unsigned IntRegsSize=4, FloatRegsSize=2;
837 static const unsigned IntRegs[] = {
838 Mips::A0, Mips::A1, Mips::A2, Mips::A3
840 static const unsigned F32Regs[] = {
843 static const unsigned F64Regs[] = {
848 static bool IntRegUsed = false;
850 // This must be the first arg of the call if no regs have been allocated.
851 // Initialize IntRegUsed in that case.
852 if (IntRegs[State.getFirstUnallocated(IntRegs, IntRegsSize)] == Mips::A0 &&
853 F32Regs[State.getFirstUnallocated(F32Regs, FloatRegsSize)] == Mips::F12 &&
854 F64Regs[State.getFirstUnallocated(F64Regs, FloatRegsSize)] == Mips::D6)
857 // Promote i8 and i16
858 if (LocVT == MVT::i8 || LocVT == MVT::i16) {
860 if (ArgFlags.isSExt())
861 LocInfo = CCValAssign::SExt;
862 else if (ArgFlags.isZExt())
863 LocInfo = CCValAssign::ZExt;
865 LocInfo = CCValAssign::AExt;
868 if (ValVT == MVT::i32) {
869 Reg = State.AllocateReg(IntRegs, IntRegsSize);
871 } else if (ValVT == MVT::f32) {
872 // An int reg has to be marked allocated regardless of whether or not
873 // IntRegUsed is true.
874 Reg = State.AllocateReg(IntRegs, IntRegsSize);
877 if (Reg) // Int reg is available
880 unsigned FReg = State.AllocateReg(F32Regs, FloatRegsSize);
881 if (FReg) // F32 reg is available
883 else if (Reg) // No F32 regs are available, but an int reg is available.
886 } else if (ValVT == MVT::f64) {
887 // Int regs have to be marked allocated regardless of whether or not
888 // IntRegUsed is true.
889 Reg = State.AllocateReg(IntRegs, IntRegsSize);
891 Reg = State.AllocateReg(IntRegs, IntRegsSize);
892 else if (Reg == Mips::A3)
894 State.AllocateReg(IntRegs, IntRegsSize);
896 // At this point, Reg is A0, A2 or 0, and all the unavailable integer regs
897 // are marked as allocated.
899 if (Reg)// if int reg is available
902 unsigned FReg = State.AllocateReg(F64Regs, FloatRegsSize);
903 if (FReg) // F64 reg is available.
905 else if (Reg) // No F64 regs are available, but an int reg is available.
909 assert(false && "cannot handle this ValVT");
912 unsigned SizeInBytes = ValVT.getSizeInBits() >> 3;
913 unsigned Offset = State.AllocateStack(SizeInBytes, SizeInBytes);
914 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
916 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
918 return false; // CC must always match
921 static bool CC_MipsO32_VarArgs(unsigned ValNo, MVT ValVT,
922 MVT LocVT, CCValAssign::LocInfo LocInfo,
923 ISD::ArgFlagsTy ArgFlags, CCState &State) {
925 static const unsigned IntRegsSize=4;
927 static const unsigned IntRegs[] = {
928 Mips::A0, Mips::A1, Mips::A2, Mips::A3
931 // Promote i8 and i16
932 if (LocVT == MVT::i8 || LocVT == MVT::i16) {
934 if (ArgFlags.isSExt())
935 LocInfo = CCValAssign::SExt;
936 else if (ArgFlags.isZExt())
937 LocInfo = CCValAssign::ZExt;
939 LocInfo = CCValAssign::AExt;
942 if (ValVT == MVT::i32 || ValVT == MVT::f32) {
943 if (unsigned Reg = State.AllocateReg(IntRegs, IntRegsSize)) {
944 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, MVT::i32, LocInfo));
947 unsigned Off = State.AllocateStack(4, 4);
948 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Off, LocVT, LocInfo));
952 unsigned UnallocIntReg = State.getFirstUnallocated(IntRegs, IntRegsSize);
953 if (ValVT == MVT::f64) {
954 if (IntRegs[UnallocIntReg] == (unsigned (Mips::A1))) {
955 // A1 can't be used anymore, because 64 bit arguments
956 // must be aligned when copied back to the caller stack
957 State.AllocateReg(IntRegs, IntRegsSize);
961 if (IntRegs[UnallocIntReg] == (unsigned (Mips::A0)) ||
962 IntRegs[UnallocIntReg] == (unsigned (Mips::A2))) {
963 unsigned Reg = State.AllocateReg(IntRegs, IntRegsSize);
964 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, MVT::i32, LocInfo));
965 // Shadow the next register so it can be used
966 // later to get the other 32bit part.
967 State.AllocateReg(IntRegs, IntRegsSize);
971 // Register is shadowed to preserve alignment, and the
972 // argument goes to a stack location.
973 if (UnallocIntReg != IntRegsSize)
974 State.AllocateReg(IntRegs, IntRegsSize);
976 unsigned Off = State.AllocateStack(8, 8);
977 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Off, LocVT, LocInfo));
981 return true; // CC didn't match
984 //===----------------------------------------------------------------------===//
985 // Call Calling Convention Implementation
986 //===----------------------------------------------------------------------===//
988 /// LowerCall - functions arguments are copied from virtual regs to
989 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
990 /// TODO: isTailCall.
992 MipsTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
993 CallingConv::ID CallConv, bool isVarArg,
995 const SmallVectorImpl<ISD::OutputArg> &Outs,
996 const SmallVectorImpl<SDValue> &OutVals,
997 const SmallVectorImpl<ISD::InputArg> &Ins,
998 DebugLoc dl, SelectionDAG &DAG,
999 SmallVectorImpl<SDValue> &InVals) const {
1000 // MIPs target does not yet support tail call optimization.
1003 MachineFunction &MF = DAG.getMachineFunction();
1004 MachineFrameInfo *MFI = MF.getFrameInfo();
1005 bool IsPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
1007 // Analyze operands of the call, assigning locations to each operand.
1008 SmallVector<CCValAssign, 16> ArgLocs;
1009 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
1012 // To meet O32 ABI, Mips must always allocate 16 bytes on
1013 // the stack (even if less than 4 are used as arguments)
1014 if (Subtarget->isABI_O32()) {
1015 int VTsize = MVT(MVT::i32).getSizeInBits()/8;
1016 MFI->CreateFixedObject(VTsize, (VTsize*3), true);
1017 CCInfo.AnalyzeCallOperands(Outs,
1018 isVarArg ? CC_MipsO32_VarArgs : CC_MipsO32);
1020 CCInfo.AnalyzeCallOperands(Outs, CC_Mips);
1022 // Get a count of how many bytes are to be pushed on the stack.
1023 unsigned NumBytes = CCInfo.getNextStackOffset();
1024 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
1026 // With EABI is it possible to have 16 args on registers.
1027 SmallVector<std::pair<unsigned, SDValue>, 16> RegsToPass;
1028 SmallVector<SDValue, 8> MemOpChains;
1030 // First/LastArgStackLoc contains the first/last
1031 // "at stack" argument location.
1032 int LastArgStackLoc = 0;
1033 unsigned FirstStackArgLoc = (Subtarget->isABI_EABI() ? 0 : 16);
1035 // Walk the register/memloc assignments, inserting copies/loads.
1036 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1037 SDValue Arg = OutVals[i];
1038 CCValAssign &VA = ArgLocs[i];
1040 // Promote the value if needed.
1041 switch (VA.getLocInfo()) {
1042 default: llvm_unreachable("Unknown loc info!");
1043 case CCValAssign::Full:
1044 if (Subtarget->isABI_O32() && VA.isRegLoc()) {
1045 if (VA.getValVT() == MVT::f32 && VA.getLocVT() == MVT::i32)
1046 Arg = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Arg);
1047 if (VA.getValVT() == MVT::f64 && VA.getLocVT() == MVT::i32) {
1048 Arg = DAG.getNode(ISD::BITCAST, dl, MVT::i64, Arg);
1049 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
1050 DAG.getConstant(0, getPointerTy()));
1051 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
1052 DAG.getConstant(1, getPointerTy()));
1053 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Lo));
1054 RegsToPass.push_back(std::make_pair(VA.getLocReg()+1, Hi));
1059 case CCValAssign::SExt:
1060 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
1062 case CCValAssign::ZExt:
1063 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
1065 case CCValAssign::AExt:
1066 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
1070 // Arguments that can be passed on register must be kept at
1071 // RegsToPass vector
1072 if (VA.isRegLoc()) {
1073 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
1077 // Register can't get to this point...
1078 assert(VA.isMemLoc());
1080 // Create the frame index object for this incoming parameter
1081 // This guarantees that when allocating Local Area the firsts
1082 // 16 bytes which are alwayes reserved won't be overwritten
1083 // if O32 ABI is used. For EABI the first address is zero.
1084 LastArgStackLoc = (FirstStackArgLoc + VA.getLocMemOffset());
1085 int FI = MFI->CreateFixedObject(VA.getValVT().getSizeInBits()/8,
1086 LastArgStackLoc, true);
1088 SDValue PtrOff = DAG.getFrameIndex(FI,getPointerTy());
1090 // emit ISD::STORE whichs stores the
1091 // parameter value to a stack Location
1092 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
1093 MachinePointerInfo(),
1097 // Transform all store nodes into one single node because all store
1098 // nodes are independent of each other.
1099 if (!MemOpChains.empty())
1100 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1101 &MemOpChains[0], MemOpChains.size());
1103 // Build a sequence of copy-to-reg nodes chained together with token
1104 // chain and flag operands which copy the outgoing args into registers.
1105 // The InFlag in necessary since all emited instructions must be
1108 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
1109 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
1110 RegsToPass[i].second, InFlag);
1111 InFlag = Chain.getValue(1);
1114 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
1115 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
1116 // node so that legalize doesn't hack it.
1117 unsigned char OpFlag = IsPIC ? MipsII::MO_GOT_CALL : MipsII::MO_NO_FLAG;
1118 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
1119 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
1120 getPointerTy(), 0, OpFlag);
1121 else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
1122 Callee = DAG.getTargetExternalSymbol(S->getSymbol(),
1123 getPointerTy(), OpFlag);
1125 // MipsJmpLink = #chain, #target_address, #opt_in_flags...
1126 // = Chain, Callee, Reg#1, Reg#2, ...
1128 // Returns a chain & a flag for retval copy to use.
1129 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
1130 SmallVector<SDValue, 8> Ops;
1131 Ops.push_back(Chain);
1132 Ops.push_back(Callee);
1134 // Add argument registers to the end of the list so that they are
1135 // known live into the call.
1136 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
1137 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
1138 RegsToPass[i].second.getValueType()));
1140 if (InFlag.getNode())
1141 Ops.push_back(InFlag);
1143 Chain = DAG.getNode(MipsISD::JmpLink, dl, NodeTys, &Ops[0], Ops.size());
1144 InFlag = Chain.getValue(1);
1146 // Create a stack location to hold GP when PIC is used. This stack
1147 // location is used on function prologue to save GP and also after all
1148 // emited CALL's to restore GP.
1150 // Function can have an arbitrary number of calls, so
1151 // hold the LastArgStackLoc with the biggest offset.
1153 MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
1154 if (LastArgStackLoc >= MipsFI->getGPStackOffset()) {
1155 LastArgStackLoc = (!LastArgStackLoc) ? (16) : (LastArgStackLoc+4);
1156 // Create the frame index only once. SPOffset here can be anything
1157 // (this will be fixed on processFunctionBeforeFrameFinalized)
1158 if (MipsFI->getGPStackOffset() == -1) {
1159 FI = MFI->CreateFixedObject(4, 0, true);
1160 MipsFI->setGPFI(FI);
1162 MipsFI->setGPStackOffset(LastArgStackLoc);
1166 FI = MipsFI->getGPFI();
1167 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1168 SDValue GPLoad = DAG.getLoad(MVT::i32, dl, Chain, FIN,
1169 MachinePointerInfo::getFixedStack(FI),
1171 Chain = GPLoad.getValue(1);
1172 Chain = DAG.getCopyToReg(Chain, dl, DAG.getRegister(Mips::GP, MVT::i32),
1173 GPLoad, SDValue(0,0));
1174 InFlag = Chain.getValue(1);
1177 // Create the CALLSEQ_END node.
1178 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
1179 DAG.getIntPtrConstant(0, true), InFlag);
1180 InFlag = Chain.getValue(1);
1182 // Handle result values, copying them out of physregs into vregs that we
1184 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
1185 Ins, dl, DAG, InVals);
1188 /// LowerCallResult - Lower the result values of a call into the
1189 /// appropriate copies out of appropriate physical registers.
1191 MipsTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
1192 CallingConv::ID CallConv, bool isVarArg,
1193 const SmallVectorImpl<ISD::InputArg> &Ins,
1194 DebugLoc dl, SelectionDAG &DAG,
1195 SmallVectorImpl<SDValue> &InVals) const {
1197 // Assign locations to each value returned by this call.
1198 SmallVector<CCValAssign, 16> RVLocs;
1199 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
1200 RVLocs, *DAG.getContext());
1202 CCInfo.AnalyzeCallResult(Ins, RetCC_Mips);
1204 // Copy all of the result registers out of their specified physreg.
1205 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1206 Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(),
1207 RVLocs[i].getValVT(), InFlag).getValue(1);
1208 InFlag = Chain.getValue(2);
1209 InVals.push_back(Chain.getValue(0));
1215 //===----------------------------------------------------------------------===//
1216 // Formal Arguments Calling Convention Implementation
1217 //===----------------------------------------------------------------------===//
1219 /// LowerFormalArguments - transform physical registers into virtual registers
1220 /// and generate load operations for arguments places on the stack.
1222 MipsTargetLowering::LowerFormalArguments(SDValue Chain,
1223 CallingConv::ID CallConv, bool isVarArg,
1224 const SmallVectorImpl<ISD::InputArg>
1226 DebugLoc dl, SelectionDAG &DAG,
1227 SmallVectorImpl<SDValue> &InVals)
1230 MachineFunction &MF = DAG.getMachineFunction();
1231 MachineFrameInfo *MFI = MF.getFrameInfo();
1232 MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
1234 unsigned StackReg = MF.getTarget().getRegisterInfo()->getFrameRegister(MF);
1235 MipsFI->setVarArgsFrameIndex(0);
1237 // Used with vargs to acumulate store chains.
1238 std::vector<SDValue> OutChains;
1240 // Keep track of the last register used for arguments
1241 unsigned ArgRegEnd = 0;
1243 // Assign locations to all of the incoming arguments.
1244 SmallVector<CCValAssign, 16> ArgLocs;
1245 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
1246 ArgLocs, *DAG.getContext());
1248 if (Subtarget->isABI_O32())
1249 CCInfo.AnalyzeFormalArguments(Ins,
1250 isVarArg ? CC_MipsO32_VarArgs : CC_MipsO32);
1252 CCInfo.AnalyzeFormalArguments(Ins, CC_Mips);
1256 unsigned FirstStackArgLoc = (Subtarget->isABI_EABI() ? 0 : 16);
1258 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1259 CCValAssign &VA = ArgLocs[i];
1261 // Arguments stored on registers
1262 if (VA.isRegLoc()) {
1263 EVT RegVT = VA.getLocVT();
1264 ArgRegEnd = VA.getLocReg();
1265 TargetRegisterClass *RC = 0;
1267 if (RegVT == MVT::i32)
1268 RC = Mips::CPURegsRegisterClass;
1269 else if (RegVT == MVT::f32)
1270 RC = Mips::FGR32RegisterClass;
1271 else if (RegVT == MVT::f64) {
1272 if (!Subtarget->isSingleFloat())
1273 RC = Mips::AFGR64RegisterClass;
1275 llvm_unreachable("RegVT not supported by FormalArguments Lowering");
1277 // Transform the arguments stored on
1278 // physical registers into virtual ones
1279 unsigned Reg = AddLiveIn(DAG.getMachineFunction(), ArgRegEnd, RC);
1280 SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
1282 // If this is an 8 or 16-bit value, it has been passed promoted
1283 // to 32 bits. Insert an assert[sz]ext to capture this, then
1284 // truncate to the right size.
1285 if (VA.getLocInfo() != CCValAssign::Full) {
1286 unsigned Opcode = 0;
1287 if (VA.getLocInfo() == CCValAssign::SExt)
1288 Opcode = ISD::AssertSext;
1289 else if (VA.getLocInfo() == CCValAssign::ZExt)
1290 Opcode = ISD::AssertZext;
1292 ArgValue = DAG.getNode(Opcode, dl, RegVT, ArgValue,
1293 DAG.getValueType(VA.getValVT()));
1294 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
1297 // Handle O32 ABI cases: i32->f32 and (i32,i32)->f64
1298 if (Subtarget->isABI_O32()) {
1299 if (RegVT == MVT::i32 && VA.getValVT() == MVT::f32)
1300 ArgValue = DAG.getNode(ISD::BITCAST, dl, MVT::f32, ArgValue);
1301 if (RegVT == MVT::i32 && VA.getValVT() == MVT::f64) {
1302 unsigned Reg2 = AddLiveIn(DAG.getMachineFunction(),
1303 VA.getLocReg()+1, RC);
1304 SDValue ArgValue2 = DAG.getCopyFromReg(Chain, dl, Reg2, RegVT);
1305 SDValue Pair = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, ArgValue2, ArgValue);
1306 ArgValue = DAG.getNode(ISD::BITCAST, dl, MVT::f64, Pair);
1310 InVals.push_back(ArgValue);
1311 } else { // VA.isRegLoc()
1314 assert(VA.isMemLoc());
1316 // The last argument is not a register anymore
1319 // The stack pointer offset is relative to the caller stack frame.
1320 // Since the real stack size is unknown here, a negative SPOffset
1321 // is used so there's a way to adjust these offsets when the stack
1322 // size get known (on EliminateFrameIndex). A dummy SPOffset is
1323 // used instead of a direct negative address (which is recorded to
1324 // be used on emitPrologue) to avoid mis-calc of the first stack
1325 // offset on PEI::calculateFrameObjectOffsets.
1326 // Arguments are always 32-bit.
1327 unsigned ArgSize = VA.getLocVT().getSizeInBits()/8;
1328 int FI = MFI->CreateFixedObject(ArgSize, 0, true);
1329 MipsFI->recordLoadArgsFI(FI, -(ArgSize+
1330 (FirstStackArgLoc + VA.getLocMemOffset())));
1332 // Create load nodes to retrieve arguments from the stack
1333 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1334 InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
1335 MachinePointerInfo::getFixedStack(FI),
1340 // The mips ABIs for returning structs by value requires that we copy
1341 // the sret argument into $v0 for the return. Save the argument into
1342 // a virtual register so that we can access it from the return points.
1343 if (DAG.getMachineFunction().getFunction()->hasStructRetAttr()) {
1344 unsigned Reg = MipsFI->getSRetReturnReg();
1346 Reg = MF.getRegInfo().createVirtualRegister(getRegClassFor(MVT::i32));
1347 MipsFI->setSRetReturnReg(Reg);
1349 SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), dl, Reg, InVals[0]);
1350 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain);
1353 // To meet ABI, when VARARGS are passed on registers, the registers
1354 // must have their values written to the caller stack frame. If the last
1355 // argument was placed in the stack, there's no need to save any register.
1356 if ((isVarArg) && (Subtarget->isABI_O32() && ArgRegEnd)) {
1357 if (StackPtr.getNode() == 0)
1358 StackPtr = DAG.getRegister(StackReg, getPointerTy());
1360 // The last register argument that must be saved is Mips::A3
1361 TargetRegisterClass *RC = Mips::CPURegsRegisterClass;
1362 unsigned StackLoc = ArgLocs.size()-1;
1364 for (++ArgRegEnd; ArgRegEnd <= Mips::A3; ++ArgRegEnd, ++StackLoc) {
1365 unsigned Reg = AddLiveIn(DAG.getMachineFunction(), ArgRegEnd, RC);
1366 SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, MVT::i32);
1368 int FI = MFI->CreateFixedObject(4, 0, true);
1369 MipsFI->recordStoreVarArgsFI(FI, -(4+(StackLoc*4)));
1370 SDValue PtrOff = DAG.getFrameIndex(FI, getPointerTy());
1371 OutChains.push_back(DAG.getStore(Chain, dl, ArgValue, PtrOff,
1372 MachinePointerInfo(),
1375 // Record the frame index of the first variable argument
1376 // which is a value necessary to VASTART.
1377 if (!MipsFI->getVarArgsFrameIndex())
1378 MipsFI->setVarArgsFrameIndex(FI);
1382 // All stores are grouped in one node to allow the matching between
1383 // the size of Ins and InVals. This only happens when on varg functions
1384 if (!OutChains.empty()) {
1385 OutChains.push_back(Chain);
1386 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1387 &OutChains[0], OutChains.size());
1393 //===----------------------------------------------------------------------===//
1394 // Return Value Calling Convention Implementation
1395 //===----------------------------------------------------------------------===//
1398 MipsTargetLowering::LowerReturn(SDValue Chain,
1399 CallingConv::ID CallConv, bool isVarArg,
1400 const SmallVectorImpl<ISD::OutputArg> &Outs,
1401 const SmallVectorImpl<SDValue> &OutVals,
1402 DebugLoc dl, SelectionDAG &DAG) const {
1404 // CCValAssign - represent the assignment of
1405 // the return value to a location
1406 SmallVector<CCValAssign, 16> RVLocs;
1408 // CCState - Info about the registers and stack slot.
1409 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
1410 RVLocs, *DAG.getContext());
1412 // Analize return values.
1413 CCInfo.AnalyzeReturn(Outs, RetCC_Mips);
1415 // If this is the first return lowered for this function, add
1416 // the regs to the liveout set for the function.
1417 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
1418 for (unsigned i = 0; i != RVLocs.size(); ++i)
1419 if (RVLocs[i].isRegLoc())
1420 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
1425 // Copy the result values into the output registers.
1426 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1427 CCValAssign &VA = RVLocs[i];
1428 assert(VA.isRegLoc() && "Can only return in registers!");
1430 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1433 // guarantee that all emitted copies are
1434 // stuck together, avoiding something bad
1435 Flag = Chain.getValue(1);
1438 // The mips ABIs for returning structs by value requires that we copy
1439 // the sret argument into $v0 for the return. We saved the argument into
1440 // a virtual register in the entry block, so now we copy the value out
1442 if (DAG.getMachineFunction().getFunction()->hasStructRetAttr()) {
1443 MachineFunction &MF = DAG.getMachineFunction();
1444 MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
1445 unsigned Reg = MipsFI->getSRetReturnReg();
1448 llvm_unreachable("sret virtual register not created in the entry block");
1449 SDValue Val = DAG.getCopyFromReg(Chain, dl, Reg, getPointerTy());
1451 Chain = DAG.getCopyToReg(Chain, dl, Mips::V0, Val, Flag);
1452 Flag = Chain.getValue(1);
1455 // Return on Mips is always a "jr $ra"
1457 return DAG.getNode(MipsISD::Ret, dl, MVT::Other,
1458 Chain, DAG.getRegister(Mips::RA, MVT::i32), Flag);
1460 return DAG.getNode(MipsISD::Ret, dl, MVT::Other,
1461 Chain, DAG.getRegister(Mips::RA, MVT::i32));
1464 //===----------------------------------------------------------------------===//
1465 // Mips Inline Assembly Support
1466 //===----------------------------------------------------------------------===//
1468 /// getConstraintType - Given a constraint letter, return the type of
1469 /// constraint it is for this target.
1470 MipsTargetLowering::ConstraintType MipsTargetLowering::
1471 getConstraintType(const std::string &Constraint) const
1473 // Mips specific constrainy
1474 // GCC config/mips/constraints.md
1476 // 'd' : An address register. Equivalent to r
1477 // unless generating MIPS16 code.
1478 // 'y' : Equivalent to r; retained for
1479 // backwards compatibility.
1480 // 'f' : Floating Point registers.
1481 if (Constraint.size() == 1) {
1482 switch (Constraint[0]) {
1487 return C_RegisterClass;
1491 return TargetLowering::getConstraintType(Constraint);
1494 /// Examine constraint type and operand type and determine a weight value.
1495 /// This object must already have been set up with the operand type
1496 /// and the current alternative constraint selected.
1497 TargetLowering::ConstraintWeight
1498 MipsTargetLowering::getSingleConstraintMatchWeight(
1499 AsmOperandInfo &info, const char *constraint) const {
1500 ConstraintWeight weight = CW_Invalid;
1501 Value *CallOperandVal = info.CallOperandVal;
1502 // If we don't have a value, we can't do a match,
1503 // but allow it at the lowest weight.
1504 if (CallOperandVal == NULL)
1506 const Type *type = CallOperandVal->getType();
1507 // Look at the constraint type.
1508 switch (*constraint) {
1510 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
1514 if (type->isIntegerTy())
1515 weight = CW_Register;
1518 if (type->isFloatTy())
1519 weight = CW_Register;
1525 /// getRegClassForInlineAsmConstraint - Given a constraint letter (e.g. "r"),
1526 /// return a list of registers that can be used to satisfy the constraint.
1527 /// This should only be used for C_RegisterClass constraints.
1528 std::pair<unsigned, const TargetRegisterClass*> MipsTargetLowering::
1529 getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const
1531 if (Constraint.size() == 1) {
1532 switch (Constraint[0]) {
1534 return std::make_pair(0U, Mips::CPURegsRegisterClass);
1537 return std::make_pair(0U, Mips::FGR32RegisterClass);
1539 if ((!Subtarget->isSingleFloat()) && (!Subtarget->isFP64bit()))
1540 return std::make_pair(0U, Mips::AFGR64RegisterClass);
1543 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
1546 /// Given a register class constraint, like 'r', if this corresponds directly
1547 /// to an LLVM register class, return a register of 0 and the register class
1549 std::vector<unsigned> MipsTargetLowering::
1550 getRegClassForInlineAsmConstraint(const std::string &Constraint,
1553 if (Constraint.size() != 1)
1554 return std::vector<unsigned>();
1556 switch (Constraint[0]) {
1559 // GCC Mips Constraint Letters
1562 return make_vector<unsigned>(Mips::T0, Mips::T1, Mips::T2, Mips::T3,
1563 Mips::T4, Mips::T5, Mips::T6, Mips::T7, Mips::S0, Mips::S1,
1564 Mips::S2, Mips::S3, Mips::S4, Mips::S5, Mips::S6, Mips::S7,
1568 if (VT == MVT::f32) {
1569 if (Subtarget->isSingleFloat())
1570 return make_vector<unsigned>(Mips::F2, Mips::F3, Mips::F4, Mips::F5,
1571 Mips::F6, Mips::F7, Mips::F8, Mips::F9, Mips::F10, Mips::F11,
1572 Mips::F20, Mips::F21, Mips::F22, Mips::F23, Mips::F24,
1573 Mips::F25, Mips::F26, Mips::F27, Mips::F28, Mips::F29,
1574 Mips::F30, Mips::F31, 0);
1576 return make_vector<unsigned>(Mips::F2, Mips::F4, Mips::F6, Mips::F8,
1577 Mips::F10, Mips::F20, Mips::F22, Mips::F24, Mips::F26,
1578 Mips::F28, Mips::F30, 0);
1582 if ((!Subtarget->isSingleFloat()) && (!Subtarget->isFP64bit()))
1583 return make_vector<unsigned>(Mips::D1, Mips::D2, Mips::D3, Mips::D4,
1584 Mips::D5, Mips::D10, Mips::D11, Mips::D12, Mips::D13,
1585 Mips::D14, Mips::D15, 0);
1587 return std::vector<unsigned>();
1591 MipsTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
1592 // The Mips target isn't yet aware of offsets.
1596 bool MipsTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
1597 if (VT != MVT::f32 && VT != MVT::f64)
1599 if (Imm.isNegZero())
1601 return Imm.isZero();