1 //===-- AlphaISelLowering.cpp - Alpha DAG Lowering Implementation ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the AlphaISelLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "AlphaISelLowering.h"
15 #include "AlphaTargetMachine.h"
16 #include "llvm/CodeGen/MachineFrameInfo.h"
17 #include "llvm/CodeGen/MachineFunction.h"
18 #include "llvm/CodeGen/MachineInstrBuilder.h"
19 #include "llvm/CodeGen/MachineRegisterInfo.h"
20 #include "llvm/CodeGen/SelectionDAG.h"
21 #include "llvm/CodeGen/MachineRegisterInfo.h"
22 #include "llvm/Constants.h"
23 #include "llvm/Function.h"
24 #include "llvm/Module.h"
25 #include "llvm/Intrinsics.h"
26 #include "llvm/Support/CommandLine.h"
29 /// AddLiveIn - This helper function adds the specified physical register to the
30 /// MachineFunction as a live in value. It also creates a corresponding virtual
32 static unsigned AddLiveIn(MachineFunction &MF, unsigned PReg,
33 TargetRegisterClass *RC) {
34 assert(RC->contains(PReg) && "Not the correct regclass!");
35 unsigned VReg = MF.getRegInfo().createVirtualRegister(RC);
36 MF.getRegInfo().addLiveIn(PReg, VReg);
40 AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM) : TargetLowering(TM) {
41 // Set up the TargetLowering object.
42 //I am having problems with shr n i8 1
43 setShiftAmountType(MVT::i64);
44 setBooleanContents(ZeroOrOneBooleanContent);
46 setUsesGlobalOffsetTable(true);
48 addRegisterClass(MVT::i64, Alpha::GPRCRegisterClass);
49 addRegisterClass(MVT::f64, Alpha::F8RCRegisterClass);
50 addRegisterClass(MVT::f32, Alpha::F4RCRegisterClass);
52 // We want to custom lower some of our intrinsics.
53 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
55 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
56 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
58 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
59 setLoadExtAction(ISD::ZEXTLOAD, MVT::i32, Expand);
61 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
62 setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
63 setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand);
65 // setOperationAction(ISD::BRIND, MVT::Other, Expand);
66 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
67 setOperationAction(ISD::BR_CC, MVT::Other, Expand);
68 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
70 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
72 setOperationAction(ISD::FREM, MVT::f32, Expand);
73 setOperationAction(ISD::FREM, MVT::f64, Expand);
75 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
76 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
77 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
78 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
80 if (!TM.getSubtarget<AlphaSubtarget>().hasCT()) {
81 setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
82 setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
83 setOperationAction(ISD::CTLZ , MVT::i64 , Expand);
85 setOperationAction(ISD::BSWAP , MVT::i64, Expand);
86 setOperationAction(ISD::ROTL , MVT::i64, Expand);
87 setOperationAction(ISD::ROTR , MVT::i64, Expand);
89 setOperationAction(ISD::SREM , MVT::i64, Custom);
90 setOperationAction(ISD::UREM , MVT::i64, Custom);
91 setOperationAction(ISD::SDIV , MVT::i64, Custom);
92 setOperationAction(ISD::UDIV , MVT::i64, Custom);
94 setOperationAction(ISD::ADDC , MVT::i64, Expand);
95 setOperationAction(ISD::ADDE , MVT::i64, Expand);
96 setOperationAction(ISD::SUBC , MVT::i64, Expand);
97 setOperationAction(ISD::SUBE , MVT::i64, Expand);
99 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
100 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
103 // We don't support sin/cos/sqrt/pow
104 setOperationAction(ISD::FSIN , MVT::f64, Expand);
105 setOperationAction(ISD::FCOS , MVT::f64, Expand);
106 setOperationAction(ISD::FSIN , MVT::f32, Expand);
107 setOperationAction(ISD::FCOS , MVT::f32, Expand);
109 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
110 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
112 setOperationAction(ISD::FPOW , MVT::f32, Expand);
113 setOperationAction(ISD::FPOW , MVT::f64, Expand);
115 setOperationAction(ISD::SETCC, MVT::f32, Promote);
117 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Promote);
119 // We don't have line number support yet.
120 setOperationAction(ISD::DBG_STOPPOINT, MVT::Other, Expand);
121 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
122 setOperationAction(ISD::DBG_LABEL, MVT::Other, Expand);
123 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
125 // Not implemented yet.
126 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
127 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
128 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
130 // We want to legalize GlobalAddress and ConstantPool and
131 // ExternalSymbols nodes into the appropriate instructions to
132 // materialize the address.
133 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
134 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
135 setOperationAction(ISD::ExternalSymbol, MVT::i64, Custom);
136 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
138 setOperationAction(ISD::VASTART, MVT::Other, Custom);
139 setOperationAction(ISD::VAEND, MVT::Other, Expand);
140 setOperationAction(ISD::VACOPY, MVT::Other, Custom);
141 setOperationAction(ISD::VAARG, MVT::Other, Custom);
142 setOperationAction(ISD::VAARG, MVT::i32, Custom);
144 setOperationAction(ISD::RET, MVT::Other, Custom);
146 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
147 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
149 setStackPointerRegisterToSaveRestore(Alpha::R30);
151 addLegalFPImmediate(APFloat(+0.0)); //F31
152 addLegalFPImmediate(APFloat(+0.0f)); //F31
153 addLegalFPImmediate(APFloat(-0.0)); //-F31
154 addLegalFPImmediate(APFloat(-0.0f)); //-F31
157 setJumpBufAlignment(16);
159 computeRegisterProperties();
162 MVT AlphaTargetLowering::getSetCCResultType(MVT VT) const {
166 const char *AlphaTargetLowering::getTargetNodeName(unsigned Opcode) const {
169 case AlphaISD::CVTQT_: return "Alpha::CVTQT_";
170 case AlphaISD::CVTQS_: return "Alpha::CVTQS_";
171 case AlphaISD::CVTTQ_: return "Alpha::CVTTQ_";
172 case AlphaISD::GPRelHi: return "Alpha::GPRelHi";
173 case AlphaISD::GPRelLo: return "Alpha::GPRelLo";
174 case AlphaISD::RelLit: return "Alpha::RelLit";
175 case AlphaISD::GlobalRetAddr: return "Alpha::GlobalRetAddr";
176 case AlphaISD::CALL: return "Alpha::CALL";
177 case AlphaISD::DivCall: return "Alpha::DivCall";
178 case AlphaISD::RET_FLAG: return "Alpha::RET_FLAG";
179 case AlphaISD::COND_BRANCH_I: return "Alpha::COND_BRANCH_I";
180 case AlphaISD::COND_BRANCH_F: return "Alpha::COND_BRANCH_F";
184 /// getFunctionAlignment - Return the function alignment.
185 unsigned AlphaTargetLowering::getFunctionAlignment(const Function *F) const {
189 static SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) {
190 MVT PtrVT = Op.getValueType();
191 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
192 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
193 SDValue Zero = DAG.getConstant(0, PtrVT);
194 // FIXME there isn't really any debug info here
195 DebugLoc dl = Op.getDebugLoc();
197 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, JTI,
198 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
199 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, JTI, Hi);
203 //http://www.cs.arizona.edu/computer.help/policy/DIGITAL_unix/
204 //AA-PY8AC-TET1_html/callCH3.html#BLOCK21
206 //For now, just use variable size stack frame format
208 //In a standard call, the first six items are passed in registers $16
209 //- $21 and/or registers $f16 - $f21. (See Section 4.1.2 for details
210 //of argument-to-register correspondence.) The remaining items are
211 //collected in a memory argument list that is a naturally aligned
212 //array of quadwords. In a standard call, this list, if present, must
213 //be passed at 0(SP).
214 //7 ... n 0(SP) ... (n-7)*8(SP)
222 static SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG,
224 int &VarArgsOffset) {
225 MachineFunction &MF = DAG.getMachineFunction();
226 MachineFrameInfo *MFI = MF.getFrameInfo();
227 std::vector<SDValue> ArgValues;
228 SDValue Root = Op.getOperand(0);
229 DebugLoc dl = Op.getDebugLoc();
231 unsigned args_int[] = {
232 Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21};
233 unsigned args_float[] = {
234 Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21};
236 for (unsigned ArgNo = 0, e = Op.getNode()->getNumValues()-1; ArgNo != e; ++ArgNo) {
238 MVT ObjectVT = Op.getValue(ArgNo).getValueType();
242 switch (ObjectVT.getSimpleVT()) {
244 assert(false && "Invalid value type!");
246 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
247 &Alpha::F8RCRegClass);
248 ArgVal = DAG.getCopyFromReg(Root, dl, args_float[ArgNo], ObjectVT);
251 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
252 &Alpha::F4RCRegClass);
253 ArgVal = DAG.getCopyFromReg(Root, dl, args_float[ArgNo], ObjectVT);
256 args_int[ArgNo] = AddLiveIn(MF, args_int[ArgNo],
257 &Alpha::GPRCRegClass);
258 ArgVal = DAG.getCopyFromReg(Root, dl, args_int[ArgNo], MVT::i64);
262 // Create the frame index object for this incoming parameter...
263 int FI = MFI->CreateFixedObject(8, 8 * (ArgNo - 6));
265 // Create the SelectionDAG nodes corresponding to a load
266 //from this parameter
267 SDValue FIN = DAG.getFrameIndex(FI, MVT::i64);
268 ArgVal = DAG.getLoad(ObjectVT, dl, Root, FIN, NULL, 0);
270 ArgValues.push_back(ArgVal);
273 // If the functions takes variable number of arguments, copy all regs to stack
274 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
276 VarArgsOffset = (Op.getNode()->getNumValues()-1) * 8;
277 std::vector<SDValue> LS;
278 for (int i = 0; i < 6; ++i) {
279 if (TargetRegisterInfo::isPhysicalRegister(args_int[i]))
280 args_int[i] = AddLiveIn(MF, args_int[i], &Alpha::GPRCRegClass);
281 SDValue argt = DAG.getCopyFromReg(Root, dl, args_int[i], MVT::i64);
282 int FI = MFI->CreateFixedObject(8, -8 * (6 - i));
283 if (i == 0) VarArgsBase = FI;
284 SDValue SDFI = DAG.getFrameIndex(FI, MVT::i64);
285 LS.push_back(DAG.getStore(Root, dl, argt, SDFI, NULL, 0));
287 if (TargetRegisterInfo::isPhysicalRegister(args_float[i]))
288 args_float[i] = AddLiveIn(MF, args_float[i], &Alpha::F8RCRegClass);
289 argt = DAG.getCopyFromReg(Root, dl, args_float[i], MVT::f64);
290 FI = MFI->CreateFixedObject(8, - 8 * (12 - i));
291 SDFI = DAG.getFrameIndex(FI, MVT::i64);
292 LS.push_back(DAG.getStore(Root, dl, argt, SDFI, NULL, 0));
295 //Set up a token factor with all the stack traffic
296 Root = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &LS[0], LS.size());
299 ArgValues.push_back(Root);
301 // Return the new list of results.
302 return DAG.getNode(ISD::MERGE_VALUES, dl, Op.getNode()->getVTList(),
303 &ArgValues[0], ArgValues.size());
306 static SDValue LowerRET(SDValue Op, SelectionDAG &DAG) {
307 DebugLoc dl = Op.getDebugLoc();
308 SDValue Copy = DAG.getCopyToReg(Op.getOperand(0), dl, Alpha::R26,
309 DAG.getNode(AlphaISD::GlobalRetAddr,
310 DebugLoc::getUnknownLoc(),
313 switch (Op.getNumOperands()) {
315 assert(0 && "Do not know how to return this many arguments!");
319 //return SDValue(); // ret void is legal
321 MVT ArgVT = Op.getOperand(1).getValueType();
323 if (ArgVT.isInteger())
326 assert(ArgVT.isFloatingPoint());
329 Copy = DAG.getCopyToReg(Copy, dl, ArgReg,
330 Op.getOperand(1), Copy.getValue(1));
331 if (DAG.getMachineFunction().getRegInfo().liveout_empty())
332 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg);
336 MVT ArgVT = Op.getOperand(1).getValueType();
337 unsigned ArgReg1, ArgReg2;
338 if (ArgVT.isInteger()) {
342 assert(ArgVT.isFloatingPoint());
346 Copy = DAG.getCopyToReg(Copy, dl, ArgReg1,
347 Op.getOperand(1), Copy.getValue(1));
348 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
349 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg1)
350 == DAG.getMachineFunction().getRegInfo().liveout_end())
351 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg1);
352 Copy = DAG.getCopyToReg(Copy, dl, ArgReg2,
353 Op.getOperand(3), Copy.getValue(1));
354 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
355 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg2)
356 == DAG.getMachineFunction().getRegInfo().liveout_end())
357 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg2);
361 return DAG.getNode(AlphaISD::RET_FLAG, dl,
362 MVT::Other, Copy, Copy.getValue(1));
365 std::pair<SDValue, SDValue>
366 AlphaTargetLowering::LowerCallTo(SDValue Chain, const Type *RetTy,
367 bool RetSExt, bool RetZExt, bool isVarArg,
368 bool isInreg, unsigned CallingConv,
369 bool isTailCall, SDValue Callee,
370 ArgListTy &Args, SelectionDAG &DAG,
374 NumBytes = (Args.size() - 6) * 8;
376 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
377 std::vector<SDValue> args_to_use;
378 for (unsigned i = 0, e = Args.size(); i != e; ++i)
380 switch (getValueType(Args[i].Ty).getSimpleVT()) {
381 default: assert(0 && "Unexpected ValueType for argument!");
386 // Promote the integer to 64 bits. If the input type is signed use a
387 // sign extend, otherwise use a zero extend.
389 Args[i].Node = DAG.getNode(ISD::SIGN_EXTEND, dl,
390 MVT::i64, Args[i].Node);
391 else if (Args[i].isZExt)
392 Args[i].Node = DAG.getNode(ISD::ZERO_EXTEND, dl,
393 MVT::i64, Args[i].Node);
395 Args[i].Node = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i64, Args[i].Node);
402 args_to_use.push_back(Args[i].Node);
405 std::vector<MVT> RetVals;
406 MVT RetTyVT = getValueType(RetTy);
407 MVT ActualRetTyVT = RetTyVT;
408 if (RetTyVT.getSimpleVT() >= MVT::i1 && RetTyVT.getSimpleVT() <= MVT::i32)
409 ActualRetTyVT = MVT::i64;
411 if (RetTyVT != MVT::isVoid)
412 RetVals.push_back(ActualRetTyVT);
413 RetVals.push_back(MVT::Other);
415 std::vector<SDValue> Ops;
416 Ops.push_back(Chain);
417 Ops.push_back(Callee);
418 Ops.insert(Ops.end(), args_to_use.begin(), args_to_use.end());
419 SDValue TheCall = DAG.getNode(AlphaISD::CALL, dl,
420 RetVals, &Ops[0], Ops.size());
421 Chain = TheCall.getValue(RetTyVT != MVT::isVoid);
422 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
423 DAG.getIntPtrConstant(0, true), SDValue());
424 SDValue RetVal = TheCall;
426 if (RetTyVT != ActualRetTyVT) {
427 ISD::NodeType AssertKind = ISD::DELETED_NODE;
429 AssertKind = ISD::AssertSext;
431 AssertKind = ISD::AssertZext;
433 if (AssertKind != ISD::DELETED_NODE)
434 RetVal = DAG.getNode(AssertKind, dl, MVT::i64, RetVal,
435 DAG.getValueType(RetTyVT));
437 RetVal = DAG.getNode(ISD::TRUNCATE, dl, RetTyVT, RetVal);
440 return std::make_pair(RetVal, Chain);
443 void AlphaTargetLowering::LowerVAARG(SDNode *N, SDValue &Chain,
444 SDValue &DataPtr, SelectionDAG &DAG) {
445 Chain = N->getOperand(0);
446 SDValue VAListP = N->getOperand(1);
447 const Value *VAListS = cast<SrcValueSDNode>(N->getOperand(2))->getValue();
448 DebugLoc dl = N->getDebugLoc();
450 SDValue Base = DAG.getLoad(MVT::i64, dl, Chain, VAListP, VAListS, 0);
451 SDValue Tmp = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
452 DAG.getConstant(8, MVT::i64));
453 SDValue Offset = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Base.getValue(1),
454 Tmp, NULL, 0, MVT::i32);
455 DataPtr = DAG.getNode(ISD::ADD, dl, MVT::i64, Base, Offset);
456 if (N->getValueType(0).isFloatingPoint())
458 //if fp && Offset < 6*8, then subtract 6*8 from DataPtr
459 SDValue FPDataPtr = DAG.getNode(ISD::SUB, dl, MVT::i64, DataPtr,
460 DAG.getConstant(8*6, MVT::i64));
461 SDValue CC = DAG.getSetCC(dl, MVT::i64, Offset,
462 DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
463 DataPtr = DAG.getNode(ISD::SELECT, dl, MVT::i64, CC, FPDataPtr, DataPtr);
466 SDValue NewOffset = DAG.getNode(ISD::ADD, dl, MVT::i64, Offset,
467 DAG.getConstant(8, MVT::i64));
468 Chain = DAG.getTruncStore(Offset.getValue(1), dl, NewOffset, Tmp, NULL, 0,
472 /// LowerOperation - Provide custom lowering hooks for some operations.
474 SDValue AlphaTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
475 DebugLoc dl = Op.getDebugLoc();
476 switch (Op.getOpcode()) {
477 default: assert(0 && "Wasn't expecting to be able to lower this!");
478 case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG,
482 case ISD::RET: return LowerRET(Op,DAG);
483 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
485 case ISD::INTRINSIC_WO_CHAIN: {
486 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
488 default: break; // Don't custom lower most intrinsics.
489 case Intrinsic::alpha_umulh:
490 return DAG.getNode(ISD::MULHU, dl, MVT::i64,
491 Op.getOperand(1), Op.getOperand(2));
495 case ISD::SINT_TO_FP: {
496 assert(Op.getOperand(0).getValueType() == MVT::i64 &&
497 "Unhandled SINT_TO_FP type in custom expander!");
499 bool isDouble = Op.getValueType() == MVT::f64;
500 LD = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op.getOperand(0));
501 SDValue FP = DAG.getNode(isDouble?AlphaISD::CVTQT_:AlphaISD::CVTQS_, dl,
502 isDouble?MVT::f64:MVT::f32, LD);
505 case ISD::FP_TO_SINT: {
506 bool isDouble = Op.getOperand(0).getValueType() == MVT::f64;
507 SDValue src = Op.getOperand(0);
509 if (!isDouble) //Promote
510 src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, src);
512 src = DAG.getNode(AlphaISD::CVTTQ_, dl, MVT::f64, src);
514 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i64, src);
516 case ISD::ConstantPool: {
517 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
518 Constant *C = CP->getConstVal();
519 SDValue CPI = DAG.getTargetConstantPool(C, MVT::i64, CP->getAlignment());
520 // FIXME there isn't really any debug info here
522 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, CPI,
523 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
524 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, CPI, Hi);
527 case ISD::GlobalTLSAddress:
528 assert(0 && "TLS not implemented for Alpha.");
529 case ISD::GlobalAddress: {
530 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
531 GlobalValue *GV = GSDN->getGlobal();
532 SDValue GA = DAG.getTargetGlobalAddress(GV, MVT::i64, GSDN->getOffset());
533 // FIXME there isn't really any debug info here
535 // if (!GV->hasWeakLinkage() && !GV->isDeclaration() && !GV->hasLinkOnceLinkage()) {
536 if (GV->hasLocalLinkage()) {
537 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, GA,
538 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
539 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, GA, Hi);
542 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64, GA,
543 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
545 case ISD::ExternalSymbol: {
546 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64,
547 DAG.getTargetExternalSymbol(cast<ExternalSymbolSDNode>(Op)
548 ->getSymbol(), MVT::i64),
549 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
554 //Expand only on constant case
555 if (Op.getOperand(1).getOpcode() == ISD::Constant) {
556 MVT VT = Op.getNode()->getValueType(0);
557 SDValue Tmp1 = Op.getNode()->getOpcode() == ISD::UREM ?
558 BuildUDIV(Op.getNode(), DAG, NULL) :
559 BuildSDIV(Op.getNode(), DAG, NULL);
560 Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Op.getOperand(1));
561 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Op.getOperand(0), Tmp1);
567 if (Op.getValueType().isInteger()) {
568 if (Op.getOperand(1).getOpcode() == ISD::Constant)
569 return Op.getOpcode() == ISD::SDIV ? BuildSDIV(Op.getNode(), DAG, NULL)
570 : BuildUDIV(Op.getNode(), DAG, NULL);
571 const char* opstr = 0;
572 switch (Op.getOpcode()) {
573 case ISD::UREM: opstr = "__remqu"; break;
574 case ISD::SREM: opstr = "__remq"; break;
575 case ISD::UDIV: opstr = "__divqu"; break;
576 case ISD::SDIV: opstr = "__divq"; break;
578 SDValue Tmp1 = Op.getOperand(0),
579 Tmp2 = Op.getOperand(1),
580 Addr = DAG.getExternalSymbol(opstr, MVT::i64);
581 return DAG.getNode(AlphaISD::DivCall, dl, MVT::i64, Addr, Tmp1, Tmp2);
586 SDValue Chain, DataPtr;
587 LowerVAARG(Op.getNode(), Chain, DataPtr, DAG);
590 if (Op.getValueType() == MVT::i32)
591 Result = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Chain, DataPtr,
594 Result = DAG.getLoad(Op.getValueType(), dl, Chain, DataPtr, NULL, 0);
598 SDValue Chain = Op.getOperand(0);
599 SDValue DestP = Op.getOperand(1);
600 SDValue SrcP = Op.getOperand(2);
601 const Value *DestS = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
602 const Value *SrcS = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
604 SDValue Val = DAG.getLoad(getPointerTy(), dl, Chain, SrcP, SrcS, 0);
605 SDValue Result = DAG.getStore(Val.getValue(1), dl, Val, DestP, DestS, 0);
606 SDValue NP = DAG.getNode(ISD::ADD, dl, MVT::i64, SrcP,
607 DAG.getConstant(8, MVT::i64));
608 Val = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Result,
609 NP, NULL,0, MVT::i32);
610 SDValue NPD = DAG.getNode(ISD::ADD, dl, MVT::i64, DestP,
611 DAG.getConstant(8, MVT::i64));
612 return DAG.getTruncStore(Val.getValue(1), dl, Val, NPD, NULL, 0, MVT::i32);
615 SDValue Chain = Op.getOperand(0);
616 SDValue VAListP = Op.getOperand(1);
617 const Value *VAListS = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
619 // vastart stores the address of the VarArgsBase and VarArgsOffset
620 SDValue FR = DAG.getFrameIndex(VarArgsBase, MVT::i64);
621 SDValue S1 = DAG.getStore(Chain, dl, FR, VAListP, VAListS, 0);
622 SDValue SA2 = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
623 DAG.getConstant(8, MVT::i64));
624 return DAG.getTruncStore(S1, dl, DAG.getConstant(VarArgsOffset, MVT::i64),
625 SA2, NULL, 0, MVT::i32);
627 case ISD::RETURNADDR:
628 return DAG.getNode(AlphaISD::GlobalRetAddr, DebugLoc::getUnknownLoc(),
631 case ISD::FRAMEADDR: break;
637 void AlphaTargetLowering::ReplaceNodeResults(SDNode *N,
638 SmallVectorImpl<SDValue>&Results,
640 DebugLoc dl = N->getDebugLoc();
641 assert(N->getValueType(0) == MVT::i32 &&
642 N->getOpcode() == ISD::VAARG &&
643 "Unknown node to custom promote!");
645 SDValue Chain, DataPtr;
646 LowerVAARG(N, Chain, DataPtr, DAG);
647 SDValue Res = DAG.getLoad(N->getValueType(0), dl, Chain, DataPtr, NULL, 0);
648 Results.push_back(Res);
649 Results.push_back(SDValue(Res.getNode(), 1));
655 /// getConstraintType - Given a constraint letter, return the type of
656 /// constraint it is for this target.
657 AlphaTargetLowering::ConstraintType
658 AlphaTargetLowering::getConstraintType(const std::string &Constraint) const {
659 if (Constraint.size() == 1) {
660 switch (Constraint[0]) {
664 return C_RegisterClass;
667 return TargetLowering::getConstraintType(Constraint);
670 std::vector<unsigned> AlphaTargetLowering::
671 getRegClassForInlineAsmConstraint(const std::string &Constraint,
673 if (Constraint.size() == 1) {
674 switch (Constraint[0]) {
675 default: break; // Unknown constriant letter
677 return make_vector<unsigned>(Alpha::F0 , Alpha::F1 , Alpha::F2 ,
678 Alpha::F3 , Alpha::F4 , Alpha::F5 ,
679 Alpha::F6 , Alpha::F7 , Alpha::F8 ,
680 Alpha::F9 , Alpha::F10, Alpha::F11,
681 Alpha::F12, Alpha::F13, Alpha::F14,
682 Alpha::F15, Alpha::F16, Alpha::F17,
683 Alpha::F18, Alpha::F19, Alpha::F20,
684 Alpha::F21, Alpha::F22, Alpha::F23,
685 Alpha::F24, Alpha::F25, Alpha::F26,
686 Alpha::F27, Alpha::F28, Alpha::F29,
687 Alpha::F30, Alpha::F31, 0);
689 return make_vector<unsigned>(Alpha::R0 , Alpha::R1 , Alpha::R2 ,
690 Alpha::R3 , Alpha::R4 , Alpha::R5 ,
691 Alpha::R6 , Alpha::R7 , Alpha::R8 ,
692 Alpha::R9 , Alpha::R10, Alpha::R11,
693 Alpha::R12, Alpha::R13, Alpha::R14,
694 Alpha::R15, Alpha::R16, Alpha::R17,
695 Alpha::R18, Alpha::R19, Alpha::R20,
696 Alpha::R21, Alpha::R22, Alpha::R23,
697 Alpha::R24, Alpha::R25, Alpha::R26,
698 Alpha::R27, Alpha::R28, Alpha::R29,
699 Alpha::R30, Alpha::R31, 0);
703 return std::vector<unsigned>();
705 //===----------------------------------------------------------------------===//
706 // Other Lowering Code
707 //===----------------------------------------------------------------------===//
710 AlphaTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
711 MachineBasicBlock *BB) const {
712 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
713 assert((MI->getOpcode() == Alpha::CAS32 ||
714 MI->getOpcode() == Alpha::CAS64 ||
715 MI->getOpcode() == Alpha::LAS32 ||
716 MI->getOpcode() == Alpha::LAS64 ||
717 MI->getOpcode() == Alpha::SWAP32 ||
718 MI->getOpcode() == Alpha::SWAP64) &&
719 "Unexpected instr type to insert");
721 bool is32 = MI->getOpcode() == Alpha::CAS32 ||
722 MI->getOpcode() == Alpha::LAS32 ||
723 MI->getOpcode() == Alpha::SWAP32;
725 //Load locked store conditional for atomic ops take on the same form
728 //do stuff (maybe branch to exit)
730 //test sc and maybe branck to start
732 const BasicBlock *LLVM_BB = BB->getBasicBlock();
733 DebugLoc dl = MI->getDebugLoc();
734 MachineFunction::iterator It = BB;
737 MachineBasicBlock *thisMBB = BB;
738 MachineFunction *F = BB->getParent();
739 MachineBasicBlock *llscMBB = F->CreateMachineBasicBlock(LLVM_BB);
740 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
742 sinkMBB->transferSuccessors(thisMBB);
744 F->insert(It, llscMBB);
745 F->insert(It, sinkMBB);
747 BuildMI(thisMBB, dl, TII->get(Alpha::BR)).addMBB(llscMBB);
749 unsigned reg_res = MI->getOperand(0).getReg(),
750 reg_ptr = MI->getOperand(1).getReg(),
751 reg_v2 = MI->getOperand(2).getReg(),
752 reg_store = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
754 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::LDL_L : Alpha::LDQ_L),
755 reg_res).addImm(0).addReg(reg_ptr);
756 switch (MI->getOpcode()) {
760 = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
761 BuildMI(llscMBB, dl, TII->get(Alpha::CMPEQ), reg_cmp)
762 .addReg(reg_v2).addReg(reg_res);
763 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
764 .addImm(0).addReg(reg_cmp).addMBB(sinkMBB);
765 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
766 .addReg(Alpha::R31).addReg(MI->getOperand(3).getReg());
771 BuildMI(llscMBB, dl,TII->get(is32 ? Alpha::ADDLr : Alpha::ADDQr), reg_store)
772 .addReg(reg_res).addReg(reg_v2);
776 case Alpha::SWAP64: {
777 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
778 .addReg(reg_v2).addReg(reg_v2);
782 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::STL_C : Alpha::STQ_C), reg_store)
783 .addReg(reg_store).addImm(0).addReg(reg_ptr);
784 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
785 .addImm(0).addReg(reg_store).addMBB(llscMBB);
786 BuildMI(llscMBB, dl, TII->get(Alpha::BR)).addMBB(sinkMBB);
788 thisMBB->addSuccessor(llscMBB);
789 llscMBB->addSuccessor(llscMBB);
790 llscMBB->addSuccessor(sinkMBB);
791 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
797 AlphaTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
798 // The Alpha target isn't yet aware of offsets.