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::CMov : return "MipsISD::CMov";
45 case MipsISD::SelectCC : return "MipsISD::SelectCC";
46 case MipsISD::FPSelectCC : return "MipsISD::FPSelectCC";
47 case MipsISD::FPBrcond : return "MipsISD::FPBrcond";
48 case MipsISD::FPCmp : return "MipsISD::FPCmp";
49 case MipsISD::FPRound : return "MipsISD::FPRound";
50 default : return NULL;
55 MipsTargetLowering(MipsTargetMachine &TM)
56 : TargetLowering(TM, new MipsTargetObjectFile()) {
57 Subtarget = &TM.getSubtarget<MipsSubtarget>();
59 // Mips does not have i1 type, so use i32 for
60 // setcc operations results (slt, sgt, ...).
61 setBooleanContents(ZeroOrOneBooleanContent);
63 // JumpTable targets must use GOT when using PIC_
64 setUsesGlobalOffsetTable(true);
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);
104 // We custom lower AND/OR to handle the case where the DAG contain 'ands/ors'
105 // with operands comming from setcc fp comparions. This is necessary since
106 // the result from these setcc are in a flag registers (FCR31).
107 setOperationAction(ISD::AND, MVT::i32, Custom);
108 setOperationAction(ISD::OR, MVT::i32, Custom);
110 // Operations not directly supported by Mips.
111 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
112 setOperationAction(ISD::BR_CC, MVT::Other, Expand);
113 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
114 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
115 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
116 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
117 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
118 setOperationAction(ISD::CTTZ, MVT::i32, Expand);
119 setOperationAction(ISD::ROTL, MVT::i32, Expand);
120 setOperationAction(ISD::ROTR, MVT::i32, Expand);
121 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
122 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
123 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
124 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
125 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
126 setOperationAction(ISD::FSIN, MVT::f32, Expand);
127 setOperationAction(ISD::FCOS, MVT::f32, Expand);
128 setOperationAction(ISD::FPOWI, MVT::f32, Expand);
129 setOperationAction(ISD::FPOW, MVT::f32, Expand);
130 setOperationAction(ISD::FLOG, MVT::f32, Expand);
131 setOperationAction(ISD::FLOG2, MVT::f32, Expand);
132 setOperationAction(ISD::FLOG10, MVT::f32, Expand);
133 setOperationAction(ISD::FEXP, MVT::f32, Expand);
135 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
137 // Use the default for now
138 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
139 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
140 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
142 if (Subtarget->isSingleFloat())
143 setOperationAction(ISD::SELECT_CC, MVT::f64, Expand);
145 if (!Subtarget->hasSEInReg()) {
146 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
147 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
150 if (!Subtarget->hasBitCount())
151 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
153 if (!Subtarget->hasSwap())
154 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
156 setStackPointerRegisterToSaveRestore(Mips::SP);
157 computeRegisterProperties();
160 MVT::SimpleValueType MipsTargetLowering::getSetCCResultType(EVT VT) const {
164 /// getFunctionAlignment - Return the Log2 alignment of this function.
165 unsigned MipsTargetLowering::getFunctionAlignment(const Function *) const {
169 SDValue MipsTargetLowering::
170 LowerOperation(SDValue Op, SelectionDAG &DAG)
172 switch (Op.getOpcode())
174 case ISD::AND: return LowerANDOR(Op, DAG);
175 case ISD::BRCOND: return LowerBRCOND(Op, DAG);
176 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
177 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
178 case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
179 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
180 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
181 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
182 case ISD::OR: return LowerANDOR(Op, DAG);
183 case ISD::SELECT: return LowerSELECT(Op, DAG);
184 case ISD::SETCC: return LowerSETCC(Op, DAG);
189 //===----------------------------------------------------------------------===//
190 // Lower helper functions
191 //===----------------------------------------------------------------------===//
193 // AddLiveIn - This helper function adds the specified physical register to the
194 // MachineFunction as a live in value. It also creates a corresponding
195 // virtual register for it.
197 AddLiveIn(MachineFunction &MF, unsigned PReg, TargetRegisterClass *RC)
199 assert(RC->contains(PReg) && "Not the correct regclass!");
200 unsigned VReg = MF.getRegInfo().createVirtualRegister(RC);
201 MF.getRegInfo().addLiveIn(PReg, VReg);
205 // Get fp branch code (not opcode) from condition code.
206 static Mips::FPBranchCode GetFPBranchCodeFromCond(Mips::CondCode CC) {
207 if (CC >= Mips::FCOND_F && CC <= Mips::FCOND_NGT)
208 return Mips::BRANCH_T;
210 if (CC >= Mips::FCOND_T && CC <= Mips::FCOND_GT)
211 return Mips::BRANCH_F;
213 return Mips::BRANCH_INVALID;
216 static unsigned FPBranchCodeToOpc(Mips::FPBranchCode BC) {
219 llvm_unreachable("Unknown branch code");
220 case Mips::BRANCH_T : return Mips::BC1T;
221 case Mips::BRANCH_F : return Mips::BC1F;
222 case Mips::BRANCH_TL : return Mips::BC1TL;
223 case Mips::BRANCH_FL : return Mips::BC1FL;
227 static Mips::CondCode FPCondCCodeToFCC(ISD::CondCode CC) {
229 default: llvm_unreachable("Unknown fp condition code!");
231 case ISD::SETOEQ: return Mips::FCOND_EQ;
232 case ISD::SETUNE: return Mips::FCOND_OGL;
234 case ISD::SETOLT: return Mips::FCOND_OLT;
236 case ISD::SETOGT: return Mips::FCOND_OGT;
238 case ISD::SETOLE: return Mips::FCOND_OLE;
240 case ISD::SETOGE: return Mips::FCOND_OGE;
241 case ISD::SETULT: return Mips::FCOND_ULT;
242 case ISD::SETULE: return Mips::FCOND_ULE;
243 case ISD::SETUGT: return Mips::FCOND_UGT;
244 case ISD::SETUGE: return Mips::FCOND_UGE;
245 case ISD::SETUO: return Mips::FCOND_UN;
246 case ISD::SETO: return Mips::FCOND_OR;
248 case ISD::SETONE: return Mips::FCOND_NEQ;
249 case ISD::SETUEQ: return Mips::FCOND_UEQ;
254 MipsTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
255 MachineBasicBlock *BB,
256 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
257 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
258 bool isFPCmp = false;
259 DebugLoc dl = MI->getDebugLoc();
261 switch (MI->getOpcode()) {
262 default: assert(false && "Unexpected instr type to insert");
263 case Mips::Select_FCC:
264 case Mips::Select_FCC_S32:
265 case Mips::Select_FCC_D32:
266 isFPCmp = true; // FALL THROUGH
267 case Mips::Select_CC:
268 case Mips::Select_CC_S32:
269 case Mips::Select_CC_D32: {
270 // To "insert" a SELECT_CC instruction, we actually have to insert the
271 // diamond control-flow pattern. The incoming instruction knows the
272 // destination vreg to set, the condition code register to branch on, the
273 // true/false values to select between, and a branch opcode to use.
274 const BasicBlock *LLVM_BB = BB->getBasicBlock();
275 MachineFunction::iterator It = BB;
282 // bNE r1, r0, copy1MBB
283 // fallthrough --> copy0MBB
284 MachineBasicBlock *thisMBB = BB;
285 MachineFunction *F = BB->getParent();
286 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
287 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
289 // Emit the right instruction according to the type of the operands compared
291 // Find the condiction code present in the setcc operation.
292 Mips::CondCode CC = (Mips::CondCode)MI->getOperand(4).getImm();
293 // Get the branch opcode from the branch code.
294 unsigned Opc = FPBranchCodeToOpc(GetFPBranchCodeFromCond(CC));
295 BuildMI(BB, dl, TII->get(Opc)).addMBB(sinkMBB);
297 BuildMI(BB, dl, TII->get(Mips::BNE)).addReg(MI->getOperand(1).getReg())
298 .addReg(Mips::ZERO).addMBB(sinkMBB);
300 F->insert(It, copy0MBB);
301 F->insert(It, sinkMBB);
302 // Update machine-CFG edges by first adding all successors of the current
303 // block to the new block which will contain the Phi node for the select.
304 // Also inform sdisel of the edge changes.
305 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
306 e = BB->succ_end(); i != e; ++i) {
307 EM->insert(std::make_pair(*i, sinkMBB));
308 sinkMBB->addSuccessor(*i);
310 // Next, remove all successors of the current block, and add the true
311 // and fallthrough blocks as its successors.
312 while(!BB->succ_empty())
313 BB->removeSuccessor(BB->succ_begin());
314 BB->addSuccessor(copy0MBB);
315 BB->addSuccessor(sinkMBB);
319 // # fallthrough to sinkMBB
322 // Update machine-CFG edges
323 BB->addSuccessor(sinkMBB);
326 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
329 BuildMI(BB, dl, TII->get(Mips::PHI), MI->getOperand(0).getReg())
330 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
331 .addReg(MI->getOperand(3).getReg()).addMBB(thisMBB);
333 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
339 //===----------------------------------------------------------------------===//
340 // Misc Lower Operation implementation
341 //===----------------------------------------------------------------------===//
343 SDValue MipsTargetLowering::
344 LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG)
346 if (!Subtarget->isMips1())
349 MachineFunction &MF = DAG.getMachineFunction();
350 unsigned CCReg = AddLiveIn(MF, Mips::FCR31, Mips::CCRRegisterClass);
352 SDValue Chain = DAG.getEntryNode();
353 DebugLoc dl = Op.getDebugLoc();
354 SDValue Src = Op.getOperand(0);
356 // Set the condition register
357 SDValue CondReg = DAG.getCopyFromReg(Chain, dl, CCReg, MVT::i32);
358 CondReg = DAG.getCopyToReg(Chain, dl, Mips::AT, CondReg);
359 CondReg = DAG.getCopyFromReg(CondReg, dl, Mips::AT, MVT::i32);
361 SDValue Cst = DAG.getConstant(3, MVT::i32);
362 SDValue Or = DAG.getNode(ISD::OR, dl, MVT::i32, CondReg, Cst);
363 Cst = DAG.getConstant(2, MVT::i32);
364 SDValue Xor = DAG.getNode(ISD::XOR, dl, MVT::i32, Or, Cst);
366 SDValue InFlag(0, 0);
367 CondReg = DAG.getCopyToReg(Chain, dl, Mips::FCR31, Xor, InFlag);
369 // Emit the round instruction and bit convert to integer
370 SDValue Trunc = DAG.getNode(MipsISD::FPRound, dl, MVT::f32,
371 Src, CondReg.getValue(1));
372 SDValue BitCvt = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Trunc);
376 SDValue MipsTargetLowering::
377 LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG)
379 SDValue Chain = Op.getOperand(0);
380 SDValue Size = Op.getOperand(1);
381 DebugLoc dl = Op.getDebugLoc();
383 // Get a reference from Mips stack pointer
384 SDValue StackPointer = DAG.getCopyFromReg(Chain, dl, Mips::SP, MVT::i32);
386 // Subtract the dynamic size from the actual stack size to
387 // obtain the new stack size.
388 SDValue Sub = DAG.getNode(ISD::SUB, dl, MVT::i32, StackPointer, Size);
390 // The Sub result contains the new stack start address, so it
391 // must be placed in the stack pointer register.
392 Chain = DAG.getCopyToReg(StackPointer.getValue(1), dl, Mips::SP, Sub);
394 // This node always has two return values: a new stack pointer
396 SDValue Ops[2] = { Sub, Chain };
397 return DAG.getMergeValues(Ops, 2, dl);
400 SDValue MipsTargetLowering::
401 LowerANDOR(SDValue Op, SelectionDAG &DAG)
403 SDValue LHS = Op.getOperand(0);
404 SDValue RHS = Op.getOperand(1);
405 DebugLoc dl = Op.getDebugLoc();
407 if (LHS.getOpcode() != MipsISD::FPCmp || RHS.getOpcode() != MipsISD::FPCmp)
410 SDValue True = DAG.getConstant(1, MVT::i32);
411 SDValue False = DAG.getConstant(0, MVT::i32);
413 SDValue LSEL = DAG.getNode(MipsISD::FPSelectCC, dl, True.getValueType(),
414 LHS, True, False, LHS.getOperand(2));
415 SDValue RSEL = DAG.getNode(MipsISD::FPSelectCC, dl, True.getValueType(),
416 RHS, True, False, RHS.getOperand(2));
418 return DAG.getNode(Op.getOpcode(), dl, MVT::i32, LSEL, RSEL);
421 SDValue MipsTargetLowering::
422 LowerBRCOND(SDValue Op, SelectionDAG &DAG)
424 // The first operand is the chain, the second is the condition, the third is
425 // the block to branch to if the condition is true.
426 SDValue Chain = Op.getOperand(0);
427 SDValue Dest = Op.getOperand(2);
428 DebugLoc dl = Op.getDebugLoc();
430 if (Op.getOperand(1).getOpcode() != MipsISD::FPCmp)
433 SDValue CondRes = Op.getOperand(1);
434 SDValue CCNode = CondRes.getOperand(2);
436 (Mips::CondCode)cast<ConstantSDNode>(CCNode)->getZExtValue();
437 SDValue BrCode = DAG.getConstant(GetFPBranchCodeFromCond(CC), MVT::i32);
439 return DAG.getNode(MipsISD::FPBrcond, dl, Op.getValueType(), Chain, BrCode,
443 SDValue MipsTargetLowering::
444 LowerSETCC(SDValue Op, SelectionDAG &DAG)
446 // The operands to this are the left and right operands to compare (ops #0,
447 // and #1) and the condition code to compare them with (op #2) as a
449 SDValue LHS = Op.getOperand(0);
450 SDValue RHS = Op.getOperand(1);
451 DebugLoc dl = Op.getDebugLoc();
453 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
455 return DAG.getNode(MipsISD::FPCmp, dl, Op.getValueType(), LHS, RHS,
456 DAG.getConstant(FPCondCCodeToFCC(CC), MVT::i32));
459 SDValue MipsTargetLowering::
460 LowerSELECT(SDValue Op, SelectionDAG &DAG)
462 SDValue Cond = Op.getOperand(0);
463 SDValue True = Op.getOperand(1);
464 SDValue False = Op.getOperand(2);
465 DebugLoc dl = Op.getDebugLoc();
467 // if the incomming condition comes from a integer compare, the select
468 // operation must be SelectCC or a conditional move if the subtarget
470 if (Cond.getOpcode() != MipsISD::FPCmp) {
471 if (Subtarget->hasCondMov() && !True.getValueType().isFloatingPoint())
473 return DAG.getNode(MipsISD::SelectCC, dl, True.getValueType(),
477 // if the incomming condition comes from fpcmp, the select
478 // operation must use FPSelectCC.
479 SDValue CCNode = Cond.getOperand(2);
480 return DAG.getNode(MipsISD::FPSelectCC, dl, True.getValueType(),
481 Cond, True, False, CCNode);
484 SDValue MipsTargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) {
485 // FIXME there isn't actually debug info here
486 DebugLoc dl = Op.getDebugLoc();
487 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
489 if (getTargetMachine().getRelocationModel() != Reloc::PIC_) {
490 SDVTList VTs = DAG.getVTList(MVT::i32);
492 MipsTargetObjectFile &TLOF = (MipsTargetObjectFile&)getObjFileLowering();
494 // %gp_rel relocation
495 if (TLOF.IsGlobalInSmallSection(GV, getTargetMachine())) {
496 SDValue GA = DAG.getTargetGlobalAddress(GV, MVT::i32, 0,
498 SDValue GPRelNode = DAG.getNode(MipsISD::GPRel, dl, VTs, &GA, 1);
499 SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(MVT::i32);
500 return DAG.getNode(ISD::ADD, dl, MVT::i32, GOT, GPRelNode);
502 // %hi/%lo relocation
503 SDValue GA = DAG.getTargetGlobalAddress(GV, MVT::i32, 0,
504 MipsII::MO_ABS_HILO);
505 SDValue HiPart = DAG.getNode(MipsISD::Hi, dl, VTs, &GA, 1);
506 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, GA);
507 return DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
510 SDValue GA = DAG.getTargetGlobalAddress(GV, MVT::i32, 0,
512 SDValue ResNode = DAG.getLoad(MVT::i32, dl,
513 DAG.getEntryNode(), GA, NULL, 0);
514 // On functions and global targets not internal linked only
515 // a load from got/GP is necessary for PIC to work.
516 if (!GV->hasLocalLinkage() || isa<Function>(GV))
518 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, GA);
519 return DAG.getNode(ISD::ADD, dl, MVT::i32, ResNode, Lo);
522 llvm_unreachable("Dont know how to handle GlobalAddress");
526 SDValue MipsTargetLowering::
527 LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG)
529 llvm_unreachable("TLS not implemented for MIPS.");
530 return SDValue(); // Not reached
533 SDValue MipsTargetLowering::
534 LowerJumpTable(SDValue Op, SelectionDAG &DAG)
538 // FIXME there isn't actually debug info here
539 DebugLoc dl = Op.getDebugLoc();
540 bool IsPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
541 unsigned char OpFlag = IsPIC ? MipsII::MO_GOT : MipsII::MO_ABS_HILO;
543 EVT PtrVT = Op.getValueType();
544 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
546 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, OpFlag);
549 SDValue Ops[] = { JTI };
550 HiPart = DAG.getNode(MipsISD::Hi, dl, DAG.getVTList(MVT::i32), Ops, 1);
551 } else // Emit Load from Global Pointer
552 HiPart = DAG.getLoad(MVT::i32, dl, DAG.getEntryNode(), JTI, NULL, 0);
554 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, JTI);
555 ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
560 SDValue MipsTargetLowering::
561 LowerConstantPool(SDValue Op, SelectionDAG &DAG)
564 ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
565 Constant *C = N->getConstVal();
566 // FIXME there isn't actually debug info here
567 DebugLoc dl = Op.getDebugLoc();
570 // FIXME: we should reference the constant pool using small data sections,
571 // but the asm printer currently doens't support this feature without
572 // hacking it. This feature should come soon so we can uncomment the
574 //if (IsInSmallSection(C->getType())) {
575 // SDValue GPRelNode = DAG.getNode(MipsISD::GPRel, MVT::i32, CP);
576 // SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(MVT::i32);
577 // ResNode = DAG.getNode(ISD::ADD, MVT::i32, GOT, GPRelNode);
579 if (getTargetMachine().getRelocationModel() != Reloc::PIC_) {
580 SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
581 N->getOffset(), MipsII::MO_ABS_HILO);
582 SDValue HiPart = DAG.getNode(MipsISD::Hi, dl, MVT::i32, CP);
583 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, CP);
584 ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
586 SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
587 N->getOffset(), MipsII::MO_GOT);
588 SDValue Load = DAG.getLoad(MVT::i32, dl, DAG.getEntryNode(),
590 SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, CP);
591 ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, Load, Lo);
597 //===----------------------------------------------------------------------===//
598 // Calling Convention Implementation
599 //===----------------------------------------------------------------------===//
601 #include "MipsGenCallingConv.inc"
603 //===----------------------------------------------------------------------===//
604 // TODO: Implement a generic logic using tblgen that can support this.
605 // Mips O32 ABI rules:
607 // i32 - Passed in A0, A1, A2, A3 and stack
608 // f32 - Only passed in f32 registers if no int reg has been used yet to hold
609 // an argument. Otherwise, passed in A1, A2, A3 and stack.
610 // f64 - Only passed in two aliased f32 registers if no int reg has been used
611 // yet to hold an argument. Otherwise, use A2, A3 and stack. If A1 is
612 // not used, it must be shadowed. If only A3 is avaiable, shadow it and
614 //===----------------------------------------------------------------------===//
616 static bool CC_MipsO32(unsigned ValNo, EVT ValVT,
617 EVT LocVT, CCValAssign::LocInfo LocInfo,
618 ISD::ArgFlagsTy ArgFlags, CCState &State) {
620 static const unsigned IntRegsSize=4, FloatRegsSize=2;
622 static const unsigned IntRegs[] = {
623 Mips::A0, Mips::A1, Mips::A2, Mips::A3
625 static const unsigned F32Regs[] = {
628 static const unsigned F64Regs[] = {
633 unsigned UnallocIntReg = State.getFirstUnallocated(IntRegs, IntRegsSize);
634 bool IntRegUsed = (IntRegs[UnallocIntReg] != (unsigned (Mips::A0)));
636 // Promote i8 and i16
637 if (LocVT == MVT::i8 || LocVT == MVT::i16) {
639 if (ArgFlags.isSExt())
640 LocInfo = CCValAssign::SExt;
641 else if (ArgFlags.isZExt())
642 LocInfo = CCValAssign::ZExt;
644 LocInfo = CCValAssign::AExt;
647 if (ValVT == MVT::i32 || (ValVT == MVT::f32 && IntRegUsed)) {
648 Reg = State.AllocateReg(IntRegs, IntRegsSize);
653 if (ValVT.isFloatingPoint() && !IntRegUsed) {
654 if (ValVT == MVT::f32)
655 Reg = State.AllocateReg(F32Regs, FloatRegsSize);
657 Reg = State.AllocateReg(F64Regs, FloatRegsSize);
660 if (ValVT == MVT::f64 && IntRegUsed) {
661 if (UnallocIntReg != IntRegsSize) {
662 // If we hit register A3 as the first not allocated, we must
663 // mark it as allocated (shadow) and use the stack instead.
664 if (IntRegs[UnallocIntReg] != (unsigned (Mips::A3)))
666 for (;UnallocIntReg < IntRegsSize; ++UnallocIntReg)
667 State.AllocateReg(UnallocIntReg);
673 unsigned SizeInBytes = ValVT.getSizeInBits() >> 3;
674 unsigned Offset = State.AllocateStack(SizeInBytes, SizeInBytes);
675 State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
677 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
679 return false; // CC must always match
682 //===----------------------------------------------------------------------===//
683 // Call Calling Convention Implementation
684 //===----------------------------------------------------------------------===//
686 /// LowerCall - functions arguments are copied from virtual regs to
687 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
688 /// TODO: isVarArg, isTailCall.
690 MipsTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
691 CallingConv::ID CallConv, bool isVarArg,
693 const SmallVectorImpl<ISD::OutputArg> &Outs,
694 const SmallVectorImpl<ISD::InputArg> &Ins,
695 DebugLoc dl, SelectionDAG &DAG,
696 SmallVectorImpl<SDValue> &InVals) {
698 MachineFunction &MF = DAG.getMachineFunction();
699 MachineFrameInfo *MFI = MF.getFrameInfo();
700 bool IsPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
702 // Analyze operands of the call, assigning locations to each operand.
703 SmallVector<CCValAssign, 16> ArgLocs;
704 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
707 // To meet O32 ABI, Mips must always allocate 16 bytes on
708 // the stack (even if less than 4 are used as arguments)
709 if (Subtarget->isABI_O32()) {
710 int VTsize = EVT(MVT::i32).getSizeInBits()/8;
711 MFI->CreateFixedObject(VTsize, (VTsize*3), true, false);
712 CCInfo.AnalyzeCallOperands(Outs, CC_MipsO32);
714 CCInfo.AnalyzeCallOperands(Outs, CC_Mips);
716 // Get a count of how many bytes are to be pushed on the stack.
717 unsigned NumBytes = CCInfo.getNextStackOffset();
718 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
720 // With EABI is it possible to have 16 args on registers.
721 SmallVector<std::pair<unsigned, SDValue>, 16> RegsToPass;
722 SmallVector<SDValue, 8> MemOpChains;
724 // First/LastArgStackLoc contains the first/last
725 // "at stack" argument location.
726 int LastArgStackLoc = 0;
727 unsigned FirstStackArgLoc = (Subtarget->isABI_EABI() ? 0 : 16);
729 // Walk the register/memloc assignments, inserting copies/loads.
730 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
731 SDValue Arg = Outs[i].Val;
732 CCValAssign &VA = ArgLocs[i];
734 // Promote the value if needed.
735 switch (VA.getLocInfo()) {
736 default: llvm_unreachable("Unknown loc info!");
737 case CCValAssign::Full:
738 if (Subtarget->isABI_O32() && VA.isRegLoc()) {
739 if (VA.getValVT() == MVT::f32 && VA.getLocVT() == MVT::i32)
740 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Arg);
741 if (VA.getValVT() == MVT::f64 && VA.getLocVT() == MVT::i32) {
742 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i64, Arg);
743 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
744 DAG.getConstant(0, getPointerTy()));
745 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
746 DAG.getConstant(1, getPointerTy()));
747 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Lo));
748 RegsToPass.push_back(std::make_pair(VA.getLocReg()+1, Hi));
753 case CCValAssign::SExt:
754 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
756 case CCValAssign::ZExt:
757 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
759 case CCValAssign::AExt:
760 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
764 // Arguments that can be passed on register must be kept at
767 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
771 // Register can't get to this point...
772 assert(VA.isMemLoc());
774 // Create the frame index object for this incoming parameter
775 // This guarantees that when allocating Local Area the firsts
776 // 16 bytes which are alwayes reserved won't be overwritten
777 // if O32 ABI is used. For EABI the first address is zero.
778 LastArgStackLoc = (FirstStackArgLoc + VA.getLocMemOffset());
779 int FI = MFI->CreateFixedObject(VA.getValVT().getSizeInBits()/8,
780 LastArgStackLoc, true, false);
782 SDValue PtrOff = DAG.getFrameIndex(FI,getPointerTy());
784 // emit ISD::STORE whichs stores the
785 // parameter value to a stack Location
786 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, NULL, 0));
789 // Transform all store nodes into one single node because all store
790 // nodes are independent of each other.
791 if (!MemOpChains.empty())
792 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
793 &MemOpChains[0], MemOpChains.size());
795 // Build a sequence of copy-to-reg nodes chained together with token
796 // chain and flag operands which copy the outgoing args into registers.
797 // The InFlag in necessary since all emited instructions must be
800 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
801 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
802 RegsToPass[i].second, InFlag);
803 InFlag = Chain.getValue(1);
806 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
807 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
808 // node so that legalize doesn't hack it.
809 unsigned char OpFlag = IsPIC ? MipsII::MO_GOT_CALL : MipsII::MO_NO_FLAG;
810 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
811 Callee = DAG.getTargetGlobalAddress(G->getGlobal(),
812 getPointerTy(), 0, OpFlag);
813 else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
814 Callee = DAG.getTargetExternalSymbol(S->getSymbol(),
815 getPointerTy(), OpFlag);
817 // MipsJmpLink = #chain, #target_address, #opt_in_flags...
818 // = Chain, Callee, Reg#1, Reg#2, ...
820 // Returns a chain & a flag for retval copy to use.
821 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
822 SmallVector<SDValue, 8> Ops;
823 Ops.push_back(Chain);
824 Ops.push_back(Callee);
826 // Add argument registers to the end of the list so that they are
827 // known live into the call.
828 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
829 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
830 RegsToPass[i].second.getValueType()));
832 if (InFlag.getNode())
833 Ops.push_back(InFlag);
835 Chain = DAG.getNode(MipsISD::JmpLink, dl, NodeTys, &Ops[0], Ops.size());
836 InFlag = Chain.getValue(1);
838 // Create the CALLSEQ_END node.
839 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
840 DAG.getIntPtrConstant(0, true), InFlag);
841 InFlag = Chain.getValue(1);
843 // Create a stack location to hold GP when PIC is used. This stack
844 // location is used on function prologue to save GP and also after all
845 // emited CALL's to restore GP.
847 // Function can have an arbitrary number of calls, so
848 // hold the LastArgStackLoc with the biggest offset.
850 MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
851 if (LastArgStackLoc >= MipsFI->getGPStackOffset()) {
852 LastArgStackLoc = (!LastArgStackLoc) ? (16) : (LastArgStackLoc+4);
853 // Create the frame index only once. SPOffset here can be anything
854 // (this will be fixed on processFunctionBeforeFrameFinalized)
855 if (MipsFI->getGPStackOffset() == -1) {
856 FI = MFI->CreateFixedObject(4, 0, true, false);
859 MipsFI->setGPStackOffset(LastArgStackLoc);
863 FI = MipsFI->getGPFI();
864 SDValue FIN = DAG.getFrameIndex(FI,getPointerTy());
865 SDValue GPLoad = DAG.getLoad(MVT::i32, dl, Chain, FIN, NULL, 0);
866 Chain = GPLoad.getValue(1);
867 Chain = DAG.getCopyToReg(Chain, dl, DAG.getRegister(Mips::GP, MVT::i32),
868 GPLoad, SDValue(0,0));
869 InFlag = Chain.getValue(1);
872 // Handle result values, copying them out of physregs into vregs that we
874 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
875 Ins, dl, DAG, InVals);
878 /// LowerCallResult - Lower the result values of a call into the
879 /// appropriate copies out of appropriate physical registers.
881 MipsTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
882 CallingConv::ID CallConv, bool isVarArg,
883 const SmallVectorImpl<ISD::InputArg> &Ins,
884 DebugLoc dl, SelectionDAG &DAG,
885 SmallVectorImpl<SDValue> &InVals) {
887 // Assign locations to each value returned by this call.
888 SmallVector<CCValAssign, 16> RVLocs;
889 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
890 RVLocs, *DAG.getContext());
892 CCInfo.AnalyzeCallResult(Ins, RetCC_Mips);
894 // Copy all of the result registers out of their specified physreg.
895 for (unsigned i = 0; i != RVLocs.size(); ++i) {
896 Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(),
897 RVLocs[i].getValVT(), InFlag).getValue(1);
898 InFlag = Chain.getValue(2);
899 InVals.push_back(Chain.getValue(0));
905 //===----------------------------------------------------------------------===//
906 // Formal Arguments Calling Convention Implementation
907 //===----------------------------------------------------------------------===//
909 /// LowerFormalArguments - transform physical registers into
910 /// virtual registers and generate load operations for
911 /// arguments places on the stack.
914 MipsTargetLowering::LowerFormalArguments(SDValue Chain,
915 CallingConv::ID CallConv, bool isVarArg,
916 const SmallVectorImpl<ISD::InputArg>
918 DebugLoc dl, SelectionDAG &DAG,
919 SmallVectorImpl<SDValue> &InVals) {
921 MachineFunction &MF = DAG.getMachineFunction();
922 MachineFrameInfo *MFI = MF.getFrameInfo();
923 MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
925 unsigned StackReg = MF.getTarget().getRegisterInfo()->getFrameRegister(MF);
927 // Assign locations to all of the incoming arguments.
928 SmallVector<CCValAssign, 16> ArgLocs;
929 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
930 ArgLocs, *DAG.getContext());
932 if (Subtarget->isABI_O32())
933 CCInfo.AnalyzeFormalArguments(Ins, CC_MipsO32);
935 CCInfo.AnalyzeFormalArguments(Ins, CC_Mips);
939 unsigned FirstStackArgLoc = (Subtarget->isABI_EABI() ? 0 : 16);
941 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
942 CCValAssign &VA = ArgLocs[i];
944 // Arguments stored on registers
946 EVT RegVT = VA.getLocVT();
947 TargetRegisterClass *RC = 0;
949 if (RegVT == MVT::i32)
950 RC = Mips::CPURegsRegisterClass;
951 else if (RegVT == MVT::f32)
952 RC = Mips::FGR32RegisterClass;
953 else if (RegVT == MVT::f64) {
954 if (!Subtarget->isSingleFloat())
955 RC = Mips::AFGR64RegisterClass;
957 llvm_unreachable("RegVT not supported by LowerFormalArguments Lowering");
959 // Transform the arguments stored on
960 // physical registers into virtual ones
961 unsigned Reg = AddLiveIn(DAG.getMachineFunction(), VA.getLocReg(), RC);
962 SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
964 // If this is an 8 or 16-bit value, it has been passed promoted
965 // to 32 bits. Insert an assert[sz]ext to capture this, then
966 // truncate to the right size.
967 if (VA.getLocInfo() != CCValAssign::Full) {
969 if (VA.getLocInfo() == CCValAssign::SExt)
970 Opcode = ISD::AssertSext;
971 else if (VA.getLocInfo() == CCValAssign::ZExt)
972 Opcode = ISD::AssertZext;
974 ArgValue = DAG.getNode(Opcode, dl, RegVT, ArgValue,
975 DAG.getValueType(VA.getValVT()));
976 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
979 // Handle O32 ABI cases: i32->f32 and (i32,i32)->f64
980 if (Subtarget->isABI_O32()) {
981 if (RegVT == MVT::i32 && VA.getValVT() == MVT::f32)
982 ArgValue = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, ArgValue);
983 if (RegVT == MVT::i32 && VA.getValVT() == MVT::f64) {
984 unsigned Reg2 = AddLiveIn(DAG.getMachineFunction(),
985 VA.getLocReg()+1, RC);
986 SDValue ArgValue2 = DAG.getCopyFromReg(Chain, dl, Reg2, RegVT);
987 SDValue Hi = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, ArgValue);
988 SDValue Lo = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, ArgValue2);
989 ArgValue = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::f64, Lo, Hi);
993 InVals.push_back(ArgValue);
995 // To meet ABI, when VARARGS are passed on registers, the registers
996 // must have their values written to the caller stack frame.
997 if ((isVarArg) && (Subtarget->isABI_O32())) {
998 if (StackPtr.getNode() == 0)
999 StackPtr = DAG.getRegister(StackReg, getPointerTy());
1001 // The stack pointer offset is relative to the caller stack frame.
1002 // Since the real stack size is unknown here, a negative SPOffset
1003 // is used so there's a way to adjust these offsets when the stack
1004 // size get known (on EliminateFrameIndex). A dummy SPOffset is
1005 // used instead of a direct negative address (which is recorded to
1006 // be used on emitPrologue) to avoid mis-calc of the first stack
1007 // offset on PEI::calculateFrameObjectOffsets.
1008 // Arguments are always 32-bit.
1009 int FI = MFI->CreateFixedObject(4, 0, true, false);
1010 MipsFI->recordStoreVarArgsFI(FI, -(4+(i*4)));
1011 SDValue PtrOff = DAG.getFrameIndex(FI, getPointerTy());
1013 // emit ISD::STORE whichs stores the
1014 // parameter value to a stack Location
1015 InVals.push_back(DAG.getStore(Chain, dl, ArgValue, PtrOff, NULL, 0));
1018 } else { // VA.isRegLoc()
1021 assert(VA.isMemLoc());
1023 // The stack pointer offset is relative to the caller stack frame.
1024 // Since the real stack size is unknown here, a negative SPOffset
1025 // is used so there's a way to adjust these offsets when the stack
1026 // size get known (on EliminateFrameIndex). A dummy SPOffset is
1027 // used instead of a direct negative address (which is recorded to
1028 // be used on emitPrologue) to avoid mis-calc of the first stack
1029 // offset on PEI::calculateFrameObjectOffsets.
1030 // Arguments are always 32-bit.
1031 unsigned ArgSize = VA.getLocVT().getSizeInBits()/8;
1032 int FI = MFI->CreateFixedObject(ArgSize, 0, true, false);
1033 MipsFI->recordLoadArgsFI(FI, -(ArgSize+
1034 (FirstStackArgLoc + VA.getLocMemOffset())));
1036 // Create load nodes to retrieve arguments from the stack
1037 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1038 InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN, NULL, 0));
1042 // The mips ABIs for returning structs by value requires that we copy
1043 // the sret argument into $v0 for the return. Save the argument into
1044 // a virtual register so that we can access it from the return points.
1045 if (DAG.getMachineFunction().getFunction()->hasStructRetAttr()) {
1046 unsigned Reg = MipsFI->getSRetReturnReg();
1048 Reg = MF.getRegInfo().createVirtualRegister(getRegClassFor(MVT::i32));
1049 MipsFI->setSRetReturnReg(Reg);
1051 SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), dl, Reg, InVals[0]);
1052 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain);
1058 //===----------------------------------------------------------------------===//
1059 // Return Value Calling Convention Implementation
1060 //===----------------------------------------------------------------------===//
1063 MipsTargetLowering::LowerReturn(SDValue Chain,
1064 CallingConv::ID CallConv, bool isVarArg,
1065 const SmallVectorImpl<ISD::OutputArg> &Outs,
1066 DebugLoc dl, SelectionDAG &DAG) {
1068 // CCValAssign - represent the assignment of
1069 // the return value to a location
1070 SmallVector<CCValAssign, 16> RVLocs;
1072 // CCState - Info about the registers and stack slot.
1073 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
1074 RVLocs, *DAG.getContext());
1076 // Analize return values.
1077 CCInfo.AnalyzeReturn(Outs, RetCC_Mips);
1079 // If this is the first return lowered for this function, add
1080 // the regs to the liveout set for the function.
1081 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
1082 for (unsigned i = 0; i != RVLocs.size(); ++i)
1083 if (RVLocs[i].isRegLoc())
1084 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
1089 // Copy the result values into the output registers.
1090 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1091 CCValAssign &VA = RVLocs[i];
1092 assert(VA.isRegLoc() && "Can only return in registers!");
1094 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1097 // guarantee that all emitted copies are
1098 // stuck together, avoiding something bad
1099 Flag = Chain.getValue(1);
1102 // The mips ABIs for returning structs by value requires that we copy
1103 // the sret argument into $v0 for the return. We saved the argument into
1104 // a virtual register in the entry block, so now we copy the value out
1106 if (DAG.getMachineFunction().getFunction()->hasStructRetAttr()) {
1107 MachineFunction &MF = DAG.getMachineFunction();
1108 MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
1109 unsigned Reg = MipsFI->getSRetReturnReg();
1112 llvm_unreachable("sret virtual register not created in the entry block");
1113 SDValue Val = DAG.getCopyFromReg(Chain, dl, Reg, getPointerTy());
1115 Chain = DAG.getCopyToReg(Chain, dl, Mips::V0, Val, Flag);
1116 Flag = Chain.getValue(1);
1119 // Return on Mips is always a "jr $ra"
1121 return DAG.getNode(MipsISD::Ret, dl, MVT::Other,
1122 Chain, DAG.getRegister(Mips::RA, MVT::i32), Flag);
1124 return DAG.getNode(MipsISD::Ret, dl, MVT::Other,
1125 Chain, DAG.getRegister(Mips::RA, MVT::i32));
1128 //===----------------------------------------------------------------------===//
1129 // Mips Inline Assembly Support
1130 //===----------------------------------------------------------------------===//
1132 /// getConstraintType - Given a constraint letter, return the type of
1133 /// constraint it is for this target.
1134 MipsTargetLowering::ConstraintType MipsTargetLowering::
1135 getConstraintType(const std::string &Constraint) const
1137 // Mips specific constrainy
1138 // GCC config/mips/constraints.md
1140 // 'd' : An address register. Equivalent to r
1141 // unless generating MIPS16 code.
1142 // 'y' : Equivalent to r; retained for
1143 // backwards compatibility.
1144 // 'f' : Floating Point registers.
1145 if (Constraint.size() == 1) {
1146 switch (Constraint[0]) {
1151 return C_RegisterClass;
1155 return TargetLowering::getConstraintType(Constraint);
1158 /// getRegClassForInlineAsmConstraint - Given a constraint letter (e.g. "r"),
1159 /// return a list of registers that can be used to satisfy the constraint.
1160 /// This should only be used for C_RegisterClass constraints.
1161 std::pair<unsigned, const TargetRegisterClass*> MipsTargetLowering::
1162 getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const
1164 if (Constraint.size() == 1) {
1165 switch (Constraint[0]) {
1167 return std::make_pair(0U, Mips::CPURegsRegisterClass);
1170 return std::make_pair(0U, Mips::FGR32RegisterClass);
1172 if ((!Subtarget->isSingleFloat()) && (!Subtarget->isFP64bit()))
1173 return std::make_pair(0U, Mips::AFGR64RegisterClass);
1176 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
1179 /// Given a register class constraint, like 'r', if this corresponds directly
1180 /// to an LLVM register class, return a register of 0 and the register class
1182 std::vector<unsigned> MipsTargetLowering::
1183 getRegClassForInlineAsmConstraint(const std::string &Constraint,
1186 if (Constraint.size() != 1)
1187 return std::vector<unsigned>();
1189 switch (Constraint[0]) {
1192 // GCC Mips Constraint Letters
1195 return make_vector<unsigned>(Mips::T0, Mips::T1, Mips::T2, Mips::T3,
1196 Mips::T4, Mips::T5, Mips::T6, Mips::T7, Mips::S0, Mips::S1,
1197 Mips::S2, Mips::S3, Mips::S4, Mips::S5, Mips::S6, Mips::S7,
1201 if (VT == MVT::f32) {
1202 if (Subtarget->isSingleFloat())
1203 return make_vector<unsigned>(Mips::F2, Mips::F3, Mips::F4, Mips::F5,
1204 Mips::F6, Mips::F7, Mips::F8, Mips::F9, Mips::F10, Mips::F11,
1205 Mips::F20, Mips::F21, Mips::F22, Mips::F23, Mips::F24,
1206 Mips::F25, Mips::F26, Mips::F27, Mips::F28, Mips::F29,
1207 Mips::F30, Mips::F31, 0);
1209 return make_vector<unsigned>(Mips::F2, Mips::F4, Mips::F6, Mips::F8,
1210 Mips::F10, Mips::F20, Mips::F22, Mips::F24, Mips::F26,
1211 Mips::F28, Mips::F30, 0);
1215 if ((!Subtarget->isSingleFloat()) && (!Subtarget->isFP64bit()))
1216 return make_vector<unsigned>(Mips::D1, Mips::D2, Mips::D3, Mips::D4,
1217 Mips::D5, Mips::D10, Mips::D11, Mips::D12, Mips::D13,
1218 Mips::D14, Mips::D15, 0);
1220 return std::vector<unsigned>();
1224 MipsTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
1225 // The Mips target isn't yet aware of offsets.
1229 bool MipsTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
1230 if (VT != MVT::f32 && VT != MVT::f64)
1232 return Imm.isZero();