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 "AlphaMachineFunctionInfo.h"
17 #include "llvm/CodeGen/CallingConvLower.h"
18 #include "llvm/CodeGen/MachineFrameInfo.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineInstrBuilder.h"
21 #include "llvm/CodeGen/MachineRegisterInfo.h"
22 #include "llvm/CodeGen/SelectionDAG.h"
23 #include "llvm/CodeGen/MachineRegisterInfo.h"
24 #include "llvm/CodeGen/PseudoSourceValue.h"
25 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
26 #include "llvm/Constants.h"
27 #include "llvm/Function.h"
28 #include "llvm/Module.h"
29 #include "llvm/Intrinsics.h"
30 #include "llvm/Type.h"
31 #include "llvm/Support/CommandLine.h"
32 #include "llvm/Support/ErrorHandling.h"
33 #include "llvm/Support/raw_ostream.h"
36 /// AddLiveIn - This helper function adds the specified physical register to the
37 /// MachineFunction as a live in value. It also creates a corresponding virtual
39 static unsigned AddLiveIn(MachineFunction &MF, unsigned PReg,
40 TargetRegisterClass *RC) {
41 assert(RC->contains(PReg) && "Not the correct regclass!");
42 unsigned VReg = MF.getRegInfo().createVirtualRegister(RC);
43 MF.getRegInfo().addLiveIn(PReg, VReg);
47 AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM)
48 : TargetLowering(TM, new TargetLoweringObjectFileELF()) {
49 // Set up the TargetLowering object.
50 //I am having problems with shr n i8 1
51 setBooleanContents(ZeroOrOneBooleanContent);
53 addRegisterClass(MVT::i64, Alpha::GPRCRegisterClass);
54 addRegisterClass(MVT::f64, Alpha::F8RCRegisterClass);
55 addRegisterClass(MVT::f32, Alpha::F4RCRegisterClass);
57 // We want to custom lower some of our intrinsics.
58 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
60 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
61 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
63 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
64 setLoadExtAction(ISD::ZEXTLOAD, MVT::i32, Expand);
66 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
67 setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
68 setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand);
70 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
72 // setOperationAction(ISD::BRIND, MVT::Other, Expand);
73 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
74 setOperationAction(ISD::BR_CC, MVT::Other, Expand);
75 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
77 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
79 setOperationAction(ISD::FREM, MVT::f32, Expand);
80 setOperationAction(ISD::FREM, MVT::f64, Expand);
82 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
83 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
84 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
85 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
87 if (!TM.getSubtarget<AlphaSubtarget>().hasCT()) {
88 setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
89 setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
90 setOperationAction(ISD::CTLZ , MVT::i64 , Expand);
92 setOperationAction(ISD::BSWAP , MVT::i64, Expand);
93 setOperationAction(ISD::ROTL , MVT::i64, Expand);
94 setOperationAction(ISD::ROTR , MVT::i64, Expand);
96 setOperationAction(ISD::SREM , MVT::i64, Custom);
97 setOperationAction(ISD::UREM , MVT::i64, Custom);
98 setOperationAction(ISD::SDIV , MVT::i64, Custom);
99 setOperationAction(ISD::UDIV , MVT::i64, Custom);
101 setOperationAction(ISD::ADDC , MVT::i64, Expand);
102 setOperationAction(ISD::ADDE , MVT::i64, Expand);
103 setOperationAction(ISD::SUBC , MVT::i64, Expand);
104 setOperationAction(ISD::SUBE , MVT::i64, Expand);
106 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
107 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
109 setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
110 setOperationAction(ISD::SRA_PARTS, MVT::i64, Expand);
111 setOperationAction(ISD::SHL_PARTS, MVT::i64, Expand);
113 // We don't support sin/cos/sqrt/pow
114 setOperationAction(ISD::FSIN , MVT::f64, Expand);
115 setOperationAction(ISD::FCOS , MVT::f64, Expand);
116 setOperationAction(ISD::FSIN , MVT::f32, Expand);
117 setOperationAction(ISD::FCOS , MVT::f32, Expand);
119 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
120 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
122 setOperationAction(ISD::FPOW , MVT::f32, Expand);
123 setOperationAction(ISD::FPOW , MVT::f64, Expand);
125 setOperationAction(ISD::FMA, MVT::f64, Expand);
126 setOperationAction(ISD::FMA, MVT::f32, Expand);
128 setOperationAction(ISD::SETCC, MVT::f32, Promote);
130 setOperationAction(ISD::BITCAST, MVT::f32, Promote);
132 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
134 // Not implemented yet.
135 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
136 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
137 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
139 // We want to legalize GlobalAddress and ConstantPool and
140 // ExternalSymbols nodes into the appropriate instructions to
141 // materialize the address.
142 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
143 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
144 setOperationAction(ISD::ExternalSymbol, MVT::i64, Custom);
145 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
147 setOperationAction(ISD::VASTART, MVT::Other, Custom);
148 setOperationAction(ISD::VAEND, MVT::Other, Expand);
149 setOperationAction(ISD::VACOPY, MVT::Other, Custom);
150 setOperationAction(ISD::VAARG, MVT::Other, Custom);
151 setOperationAction(ISD::VAARG, MVT::i32, Custom);
153 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
154 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
156 setOperationAction(ISD::ATOMIC_LOAD, MVT::i32, Expand);
157 setOperationAction(ISD::ATOMIC_STORE, MVT::i32, Expand);
159 setStackPointerRegisterToSaveRestore(Alpha::R30);
162 setJumpBufAlignment(16);
164 setMinFunctionAlignment(4);
166 setInsertFencesForAtomic(true);
168 computeRegisterProperties();
171 MVT::SimpleValueType AlphaTargetLowering::getSetCCResultType(EVT VT) const {
175 const char *AlphaTargetLowering::getTargetNodeName(unsigned Opcode) const {
178 case AlphaISD::CVTQT_: return "Alpha::CVTQT_";
179 case AlphaISD::CVTQS_: return "Alpha::CVTQS_";
180 case AlphaISD::CVTTQ_: return "Alpha::CVTTQ_";
181 case AlphaISD::GPRelHi: return "Alpha::GPRelHi";
182 case AlphaISD::GPRelLo: return "Alpha::GPRelLo";
183 case AlphaISD::RelLit: return "Alpha::RelLit";
184 case AlphaISD::GlobalRetAddr: return "Alpha::GlobalRetAddr";
185 case AlphaISD::CALL: return "Alpha::CALL";
186 case AlphaISD::DivCall: return "Alpha::DivCall";
187 case AlphaISD::RET_FLAG: return "Alpha::RET_FLAG";
188 case AlphaISD::COND_BRANCH_I: return "Alpha::COND_BRANCH_I";
189 case AlphaISD::COND_BRANCH_F: return "Alpha::COND_BRANCH_F";
193 static SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) {
194 EVT PtrVT = Op.getValueType();
195 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
196 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
197 // FIXME there isn't really any debug info here
198 DebugLoc dl = Op.getDebugLoc();
200 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, JTI,
201 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
202 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, JTI, Hi);
206 //http://www.cs.arizona.edu/computer.help/policy/DIGITAL_unix/
207 //AA-PY8AC-TET1_html/callCH3.html#BLOCK21
209 //For now, just use variable size stack frame format
211 //In a standard call, the first six items are passed in registers $16
212 //- $21 and/or registers $f16 - $f21. (See Section 4.1.2 for details
213 //of argument-to-register correspondence.) The remaining items are
214 //collected in a memory argument list that is a naturally aligned
215 //array of quadwords. In a standard call, this list, if present, must
216 //be passed at 0(SP).
217 //7 ... n 0(SP) ... (n-7)*8(SP)
225 #include "AlphaGenCallingConv.inc"
228 AlphaTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
229 CallingConv::ID CallConv, bool isVarArg,
231 const SmallVectorImpl<ISD::OutputArg> &Outs,
232 const SmallVectorImpl<SDValue> &OutVals,
233 const SmallVectorImpl<ISD::InputArg> &Ins,
234 DebugLoc dl, SelectionDAG &DAG,
235 SmallVectorImpl<SDValue> &InVals) const {
236 // Alpha target does not yet support tail call optimization.
239 // Analyze operands of the call, assigning locations to each operand.
240 SmallVector<CCValAssign, 16> ArgLocs;
241 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
242 getTargetMachine(), ArgLocs, *DAG.getContext());
244 CCInfo.AnalyzeCallOperands(Outs, CC_Alpha);
246 // Get a count of how many bytes are to be pushed on the stack.
247 unsigned NumBytes = CCInfo.getNextStackOffset();
249 Chain = DAG.getCALLSEQ_START(Chain, DAG.getConstant(NumBytes,
250 getPointerTy(), true));
252 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
253 SmallVector<SDValue, 12> MemOpChains;
256 // Walk the register/memloc assignments, inserting copies/loads.
257 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
258 CCValAssign &VA = ArgLocs[i];
260 SDValue Arg = OutVals[i];
262 // Promote the value if needed.
263 switch (VA.getLocInfo()) {
264 default: assert(0 && "Unknown loc info!");
265 case CCValAssign::Full: break;
266 case CCValAssign::SExt:
267 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
269 case CCValAssign::ZExt:
270 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
272 case CCValAssign::AExt:
273 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
277 // Arguments that can be passed on register must be kept at RegsToPass
280 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
282 assert(VA.isMemLoc());
284 if (StackPtr.getNode() == 0)
285 StackPtr = DAG.getCopyFromReg(Chain, dl, Alpha::R30, MVT::i64);
287 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
289 DAG.getIntPtrConstant(VA.getLocMemOffset()));
291 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
292 MachinePointerInfo(),false, false, 0));
296 // Transform all store nodes into one single node because all store nodes are
297 // independent of each other.
298 if (!MemOpChains.empty())
299 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
300 &MemOpChains[0], MemOpChains.size());
302 // Build a sequence of copy-to-reg nodes chained together with token chain and
303 // flag operands which copy the outgoing args into registers. The InFlag in
304 // necessary since all emitted instructions must be stuck together.
306 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
307 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
308 RegsToPass[i].second, InFlag);
309 InFlag = Chain.getValue(1);
312 // Returns a chain & a flag for retval copy to use.
313 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
314 SmallVector<SDValue, 8> Ops;
315 Ops.push_back(Chain);
316 Ops.push_back(Callee);
318 // Add argument registers to the end of the list so that they are
319 // known live into the call.
320 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
321 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
322 RegsToPass[i].second.getValueType()));
324 if (InFlag.getNode())
325 Ops.push_back(InFlag);
327 Chain = DAG.getNode(AlphaISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
328 InFlag = Chain.getValue(1);
330 // Create the CALLSEQ_END node.
331 Chain = DAG.getCALLSEQ_END(Chain,
332 DAG.getConstant(NumBytes, getPointerTy(), true),
333 DAG.getConstant(0, getPointerTy(), true),
335 InFlag = Chain.getValue(1);
337 // Handle result values, copying them out of physregs into vregs that we
339 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
340 Ins, dl, DAG, InVals);
343 /// LowerCallResult - Lower the result values of a call into the
344 /// appropriate copies out of appropriate physical registers.
347 AlphaTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
348 CallingConv::ID CallConv, bool isVarArg,
349 const SmallVectorImpl<ISD::InputArg> &Ins,
350 DebugLoc dl, SelectionDAG &DAG,
351 SmallVectorImpl<SDValue> &InVals) const {
353 // Assign locations to each value returned by this call.
354 SmallVector<CCValAssign, 16> RVLocs;
355 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
356 getTargetMachine(), RVLocs, *DAG.getContext());
358 CCInfo.AnalyzeCallResult(Ins, RetCC_Alpha);
360 // Copy all of the result registers out of their specified physreg.
361 for (unsigned i = 0; i != RVLocs.size(); ++i) {
362 CCValAssign &VA = RVLocs[i];
364 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
365 VA.getLocVT(), InFlag).getValue(1);
366 SDValue RetValue = Chain.getValue(0);
367 InFlag = Chain.getValue(2);
369 // If this is an 8/16/32-bit value, it is really passed promoted to 64
370 // bits. Insert an assert[sz]ext to capture this, then truncate to the
372 if (VA.getLocInfo() == CCValAssign::SExt)
373 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
374 DAG.getValueType(VA.getValVT()));
375 else if (VA.getLocInfo() == CCValAssign::ZExt)
376 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
377 DAG.getValueType(VA.getValVT()));
379 if (VA.getLocInfo() != CCValAssign::Full)
380 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
382 InVals.push_back(RetValue);
389 AlphaTargetLowering::LowerFormalArguments(SDValue Chain,
390 CallingConv::ID CallConv, bool isVarArg,
391 const SmallVectorImpl<ISD::InputArg>
393 DebugLoc dl, SelectionDAG &DAG,
394 SmallVectorImpl<SDValue> &InVals)
397 MachineFunction &MF = DAG.getMachineFunction();
398 MachineFrameInfo *MFI = MF.getFrameInfo();
399 AlphaMachineFunctionInfo *FuncInfo = MF.getInfo<AlphaMachineFunctionInfo>();
401 unsigned args_int[] = {
402 Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21};
403 unsigned args_float[] = {
404 Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21};
406 for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
408 EVT ObjectVT = Ins[ArgNo].VT;
412 switch (ObjectVT.getSimpleVT().SimpleTy) {
414 assert(false && "Invalid value type!");
416 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
417 &Alpha::F8RCRegClass);
418 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
421 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
422 &Alpha::F4RCRegClass);
423 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
426 args_int[ArgNo] = AddLiveIn(MF, args_int[ArgNo],
427 &Alpha::GPRCRegClass);
428 ArgVal = DAG.getCopyFromReg(Chain, dl, args_int[ArgNo], MVT::i64);
432 // Create the frame index object for this incoming parameter...
433 int FI = MFI->CreateFixedObject(8, 8 * (ArgNo - 6), true);
435 // Create the SelectionDAG nodes corresponding to a load
436 //from this parameter
437 SDValue FIN = DAG.getFrameIndex(FI, MVT::i64);
438 ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, MachinePointerInfo(),
441 InVals.push_back(ArgVal);
444 // If the functions takes variable number of arguments, copy all regs to stack
446 FuncInfo->setVarArgsOffset(Ins.size() * 8);
447 std::vector<SDValue> LS;
448 for (int i = 0; i < 6; ++i) {
449 if (TargetRegisterInfo::isPhysicalRegister(args_int[i]))
450 args_int[i] = AddLiveIn(MF, args_int[i], &Alpha::GPRCRegClass);
451 SDValue argt = DAG.getCopyFromReg(Chain, dl, args_int[i], MVT::i64);
452 int FI = MFI->CreateFixedObject(8, -8 * (6 - i), true);
453 if (i == 0) FuncInfo->setVarArgsBase(FI);
454 SDValue SDFI = DAG.getFrameIndex(FI, MVT::i64);
455 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, MachinePointerInfo(),
458 if (TargetRegisterInfo::isPhysicalRegister(args_float[i]))
459 args_float[i] = AddLiveIn(MF, args_float[i], &Alpha::F8RCRegClass);
460 argt = DAG.getCopyFromReg(Chain, dl, args_float[i], MVT::f64);
461 FI = MFI->CreateFixedObject(8, - 8 * (12 - i), true);
462 SDFI = DAG.getFrameIndex(FI, MVT::i64);
463 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, MachinePointerInfo(),
467 //Set up a token factor with all the stack traffic
468 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &LS[0], LS.size());
475 AlphaTargetLowering::LowerReturn(SDValue Chain,
476 CallingConv::ID CallConv, bool isVarArg,
477 const SmallVectorImpl<ISD::OutputArg> &Outs,
478 const SmallVectorImpl<SDValue> &OutVals,
479 DebugLoc dl, SelectionDAG &DAG) const {
481 SDValue Copy = DAG.getCopyToReg(Chain, dl, Alpha::R26,
482 DAG.getNode(AlphaISD::GlobalRetAddr,
483 DebugLoc(), MVT::i64),
485 switch (Outs.size()) {
487 llvm_unreachable("Do not know how to return this many arguments!");
490 //return SDValue(); // ret void is legal
492 EVT ArgVT = Outs[0].VT;
494 if (ArgVT.isInteger())
497 assert(ArgVT.isFloatingPoint());
500 Copy = DAG.getCopyToReg(Copy, dl, ArgReg,
501 OutVals[0], Copy.getValue(1));
502 if (DAG.getMachineFunction().getRegInfo().liveout_empty())
503 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg);
507 EVT ArgVT = Outs[0].VT;
508 unsigned ArgReg1, ArgReg2;
509 if (ArgVT.isInteger()) {
513 assert(ArgVT.isFloatingPoint());
517 Copy = DAG.getCopyToReg(Copy, dl, ArgReg1,
518 OutVals[0], Copy.getValue(1));
519 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
520 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg1)
521 == DAG.getMachineFunction().getRegInfo().liveout_end())
522 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg1);
523 Copy = DAG.getCopyToReg(Copy, dl, ArgReg2,
524 OutVals[1], Copy.getValue(1));
525 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
526 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg2)
527 == DAG.getMachineFunction().getRegInfo().liveout_end())
528 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg2);
532 return DAG.getNode(AlphaISD::RET_FLAG, dl,
533 MVT::Other, Copy, Copy.getValue(1));
536 void AlphaTargetLowering::LowerVAARG(SDNode *N, SDValue &Chain,
538 SelectionDAG &DAG) const {
539 Chain = N->getOperand(0);
540 SDValue VAListP = N->getOperand(1);
541 const Value *VAListS = cast<SrcValueSDNode>(N->getOperand(2))->getValue();
542 DebugLoc dl = N->getDebugLoc();
544 SDValue Base = DAG.getLoad(MVT::i64, dl, Chain, VAListP,
545 MachinePointerInfo(VAListS),
547 SDValue Tmp = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
548 DAG.getConstant(8, MVT::i64));
549 SDValue Offset = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Base.getValue(1),
550 Tmp, MachinePointerInfo(),
551 MVT::i32, false, false, 0);
552 DataPtr = DAG.getNode(ISD::ADD, dl, MVT::i64, Base, Offset);
553 if (N->getValueType(0).isFloatingPoint())
555 //if fp && Offset < 6*8, then subtract 6*8 from DataPtr
556 SDValue FPDataPtr = DAG.getNode(ISD::SUB, dl, MVT::i64, DataPtr,
557 DAG.getConstant(8*6, MVT::i64));
558 SDValue CC = DAG.getSetCC(dl, MVT::i64, Offset,
559 DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
560 DataPtr = DAG.getNode(ISD::SELECT, dl, MVT::i64, CC, FPDataPtr, DataPtr);
563 SDValue NewOffset = DAG.getNode(ISD::ADD, dl, MVT::i64, Offset,
564 DAG.getConstant(8, MVT::i64));
565 Chain = DAG.getTruncStore(Offset.getValue(1), dl, NewOffset, Tmp,
566 MachinePointerInfo(),
567 MVT::i32, false, false, 0);
570 /// LowerOperation - Provide custom lowering hooks for some operations.
572 SDValue AlphaTargetLowering::LowerOperation(SDValue Op,
573 SelectionDAG &DAG) const {
574 DebugLoc dl = Op.getDebugLoc();
575 switch (Op.getOpcode()) {
576 default: llvm_unreachable("Wasn't expecting to be able to lower this!");
577 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
579 case ISD::INTRINSIC_WO_CHAIN: {
580 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
582 default: break; // Don't custom lower most intrinsics.
583 case Intrinsic::alpha_umulh:
584 return DAG.getNode(ISD::MULHU, dl, MVT::i64,
585 Op.getOperand(1), Op.getOperand(2));
589 case ISD::SRL_PARTS: {
590 SDValue ShOpLo = Op.getOperand(0);
591 SDValue ShOpHi = Op.getOperand(1);
592 SDValue ShAmt = Op.getOperand(2);
593 SDValue bm = DAG.getNode(ISD::SUB, dl, MVT::i64,
594 DAG.getConstant(64, MVT::i64), ShAmt);
595 SDValue BMCC = DAG.getSetCC(dl, MVT::i64, bm,
596 DAG.getConstant(0, MVT::i64), ISD::SETLE);
597 // if 64 - shAmt <= 0
598 SDValue Hi_Neg = DAG.getConstant(0, MVT::i64);
599 SDValue ShAmt_Neg = DAG.getNode(ISD::SUB, dl, MVT::i64,
600 DAG.getConstant(0, MVT::i64), bm);
601 SDValue Lo_Neg = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt_Neg);
603 SDValue carries = DAG.getNode(ISD::SHL, dl, MVT::i64, ShOpHi, bm);
604 SDValue Hi_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt);
605 SDValue Lo_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpLo, ShAmt);
606 Lo_Pos = DAG.getNode(ISD::OR, dl, MVT::i64, Lo_Pos, carries);
608 SDValue Hi = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Hi_Neg, Hi_Pos);
609 SDValue Lo = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Lo_Neg, Lo_Pos);
610 SDValue Ops[2] = { Lo, Hi };
611 return DAG.getMergeValues(Ops, 2, dl);
613 // case ISD::SRA_PARTS:
615 // case ISD::SHL_PARTS:
618 case ISD::SINT_TO_FP: {
619 assert(Op.getOperand(0).getValueType() == MVT::i64 &&
620 "Unhandled SINT_TO_FP type in custom expander!");
622 bool isDouble = Op.getValueType() == MVT::f64;
623 LD = DAG.getNode(ISD::BITCAST, dl, MVT::f64, Op.getOperand(0));
624 SDValue FP = DAG.getNode(isDouble?AlphaISD::CVTQT_:AlphaISD::CVTQS_, dl,
625 isDouble?MVT::f64:MVT::f32, LD);
628 case ISD::FP_TO_SINT: {
629 bool isDouble = Op.getOperand(0).getValueType() == MVT::f64;
630 SDValue src = Op.getOperand(0);
632 if (!isDouble) //Promote
633 src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, src);
635 src = DAG.getNode(AlphaISD::CVTTQ_, dl, MVT::f64, src);
637 return DAG.getNode(ISD::BITCAST, dl, MVT::i64, src);
639 case ISD::ConstantPool: {
640 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
641 const Constant *C = CP->getConstVal();
642 SDValue CPI = DAG.getTargetConstantPool(C, MVT::i64, CP->getAlignment());
643 // FIXME there isn't really any debug info here
645 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, CPI,
646 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
647 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, CPI, Hi);
650 case ISD::GlobalTLSAddress:
651 llvm_unreachable("TLS not implemented for Alpha.");
652 case ISD::GlobalAddress: {
653 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
654 const GlobalValue *GV = GSDN->getGlobal();
655 SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i64,
657 // FIXME there isn't really any debug info here
659 // if (!GV->hasWeakLinkage() && !GV->isDeclaration()
660 // && !GV->hasLinkOnceLinkage()) {
661 if (GV->hasLocalLinkage()) {
662 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, GA,
663 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
664 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, GA, Hi);
667 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64, GA,
668 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
670 case ISD::ExternalSymbol: {
671 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64,
672 DAG.getTargetExternalSymbol(cast<ExternalSymbolSDNode>(Op)
673 ->getSymbol(), MVT::i64),
674 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
679 //Expand only on constant case
680 if (Op.getOperand(1).getOpcode() == ISD::Constant) {
681 EVT VT = Op.getNode()->getValueType(0);
682 SDValue Tmp1 = Op.getNode()->getOpcode() == ISD::UREM ?
683 BuildUDIV(Op.getNode(), DAG, NULL) :
684 BuildSDIV(Op.getNode(), DAG, NULL);
685 Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Op.getOperand(1));
686 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Op.getOperand(0), Tmp1);
692 if (Op.getValueType().isInteger()) {
693 if (Op.getOperand(1).getOpcode() == ISD::Constant)
694 return Op.getOpcode() == ISD::SDIV ? BuildSDIV(Op.getNode(), DAG, NULL)
695 : BuildUDIV(Op.getNode(), DAG, NULL);
696 const char* opstr = 0;
697 switch (Op.getOpcode()) {
698 case ISD::UREM: opstr = "__remqu"; break;
699 case ISD::SREM: opstr = "__remq"; break;
700 case ISD::UDIV: opstr = "__divqu"; break;
701 case ISD::SDIV: opstr = "__divq"; break;
703 SDValue Tmp1 = Op.getOperand(0),
704 Tmp2 = Op.getOperand(1),
705 Addr = DAG.getExternalSymbol(opstr, MVT::i64);
706 return DAG.getNode(AlphaISD::DivCall, dl, MVT::i64, Addr, Tmp1, Tmp2);
711 SDValue Chain, DataPtr;
712 LowerVAARG(Op.getNode(), Chain, DataPtr, DAG);
715 if (Op.getValueType() == MVT::i32)
716 Result = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Chain, DataPtr,
717 MachinePointerInfo(), MVT::i32, false, false, 0);
719 Result = DAG.getLoad(Op.getValueType(), dl, Chain, DataPtr,
720 MachinePointerInfo(),
725 SDValue Chain = Op.getOperand(0);
726 SDValue DestP = Op.getOperand(1);
727 SDValue SrcP = Op.getOperand(2);
728 const Value *DestS = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
729 const Value *SrcS = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
731 SDValue Val = DAG.getLoad(getPointerTy(), dl, Chain, SrcP,
732 MachinePointerInfo(SrcS),
734 SDValue Result = DAG.getStore(Val.getValue(1), dl, Val, DestP,
735 MachinePointerInfo(DestS),
737 SDValue NP = DAG.getNode(ISD::ADD, dl, MVT::i64, SrcP,
738 DAG.getConstant(8, MVT::i64));
739 Val = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Result,
740 NP, MachinePointerInfo(), MVT::i32, false, false, 0);
741 SDValue NPD = DAG.getNode(ISD::ADD, dl, MVT::i64, DestP,
742 DAG.getConstant(8, MVT::i64));
743 return DAG.getTruncStore(Val.getValue(1), dl, Val, NPD,
744 MachinePointerInfo(), MVT::i32,
748 MachineFunction &MF = DAG.getMachineFunction();
749 AlphaMachineFunctionInfo *FuncInfo = MF.getInfo<AlphaMachineFunctionInfo>();
751 SDValue Chain = Op.getOperand(0);
752 SDValue VAListP = Op.getOperand(1);
753 const Value *VAListS = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
755 // vastart stores the address of the VarArgsBase and VarArgsOffset
756 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsBase(), MVT::i64);
757 SDValue S1 = DAG.getStore(Chain, dl, FR, VAListP,
758 MachinePointerInfo(VAListS), false, false, 0);
759 SDValue SA2 = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
760 DAG.getConstant(8, MVT::i64));
761 return DAG.getTruncStore(S1, dl,
762 DAG.getConstant(FuncInfo->getVarArgsOffset(),
764 SA2, MachinePointerInfo(),
765 MVT::i32, false, false, 0);
767 case ISD::RETURNADDR:
768 return DAG.getNode(AlphaISD::GlobalRetAddr, DebugLoc(), MVT::i64);
770 case ISD::FRAMEADDR: break;
776 void AlphaTargetLowering::ReplaceNodeResults(SDNode *N,
777 SmallVectorImpl<SDValue>&Results,
778 SelectionDAG &DAG) const {
779 DebugLoc dl = N->getDebugLoc();
780 assert(N->getValueType(0) == MVT::i32 &&
781 N->getOpcode() == ISD::VAARG &&
782 "Unknown node to custom promote!");
784 SDValue Chain, DataPtr;
785 LowerVAARG(N, Chain, DataPtr, DAG);
786 SDValue Res = DAG.getLoad(N->getValueType(0), dl, Chain, DataPtr,
787 MachinePointerInfo(),
789 Results.push_back(Res);
790 Results.push_back(SDValue(Res.getNode(), 1));
796 /// getConstraintType - Given a constraint letter, return the type of
797 /// constraint it is for this target.
798 AlphaTargetLowering::ConstraintType
799 AlphaTargetLowering::getConstraintType(const std::string &Constraint) const {
800 if (Constraint.size() == 1) {
801 switch (Constraint[0]) {
805 return C_RegisterClass;
808 return TargetLowering::getConstraintType(Constraint);
811 /// Examine constraint type and operand type and determine a weight value.
812 /// This object must already have been set up with the operand type
813 /// and the current alternative constraint selected.
814 TargetLowering::ConstraintWeight
815 AlphaTargetLowering::getSingleConstraintMatchWeight(
816 AsmOperandInfo &info, const char *constraint) const {
817 ConstraintWeight weight = CW_Invalid;
818 Value *CallOperandVal = info.CallOperandVal;
819 // If we don't have a value, we can't do a match,
820 // but allow it at the lowest weight.
821 if (CallOperandVal == NULL)
823 // Look at the constraint type.
824 switch (*constraint) {
826 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
829 weight = CW_Register;
835 /// Given a register class constraint, like 'r', if this corresponds directly
836 /// to an LLVM register class, return a register of 0 and the register class
838 std::pair<unsigned, const TargetRegisterClass*> AlphaTargetLowering::
839 getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const
841 if (Constraint.size() == 1) {
842 switch (Constraint[0]) {
844 return std::make_pair(0U, Alpha::GPRCRegisterClass);
846 return VT == MVT::f64 ? std::make_pair(0U, Alpha::F8RCRegisterClass) :
847 std::make_pair(0U, Alpha::F4RCRegisterClass);
850 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
853 //===----------------------------------------------------------------------===//
854 // Other Lowering Code
855 //===----------------------------------------------------------------------===//
858 AlphaTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
859 MachineBasicBlock *BB) const {
860 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
861 assert((MI->getOpcode() == Alpha::CAS32 ||
862 MI->getOpcode() == Alpha::CAS64 ||
863 MI->getOpcode() == Alpha::LAS32 ||
864 MI->getOpcode() == Alpha::LAS64 ||
865 MI->getOpcode() == Alpha::SWAP32 ||
866 MI->getOpcode() == Alpha::SWAP64) &&
867 "Unexpected instr type to insert");
869 bool is32 = MI->getOpcode() == Alpha::CAS32 ||
870 MI->getOpcode() == Alpha::LAS32 ||
871 MI->getOpcode() == Alpha::SWAP32;
873 //Load locked store conditional for atomic ops take on the same form
876 //do stuff (maybe branch to exit)
878 //test sc and maybe branck to start
880 const BasicBlock *LLVM_BB = BB->getBasicBlock();
881 DebugLoc dl = MI->getDebugLoc();
882 MachineFunction::iterator It = BB;
885 MachineBasicBlock *thisMBB = BB;
886 MachineFunction *F = BB->getParent();
887 MachineBasicBlock *llscMBB = F->CreateMachineBasicBlock(LLVM_BB);
888 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
890 sinkMBB->splice(sinkMBB->begin(), thisMBB,
891 llvm::next(MachineBasicBlock::iterator(MI)),
893 sinkMBB->transferSuccessorsAndUpdatePHIs(thisMBB);
895 F->insert(It, llscMBB);
896 F->insert(It, sinkMBB);
898 BuildMI(thisMBB, dl, TII->get(Alpha::BR)).addMBB(llscMBB);
900 unsigned reg_res = MI->getOperand(0).getReg(),
901 reg_ptr = MI->getOperand(1).getReg(),
902 reg_v2 = MI->getOperand(2).getReg(),
903 reg_store = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
905 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::LDL_L : Alpha::LDQ_L),
906 reg_res).addImm(0).addReg(reg_ptr);
907 switch (MI->getOpcode()) {
911 = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
912 BuildMI(llscMBB, dl, TII->get(Alpha::CMPEQ), reg_cmp)
913 .addReg(reg_v2).addReg(reg_res);
914 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
915 .addImm(0).addReg(reg_cmp).addMBB(sinkMBB);
916 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
917 .addReg(Alpha::R31).addReg(MI->getOperand(3).getReg());
922 BuildMI(llscMBB, dl,TII->get(is32 ? Alpha::ADDLr : Alpha::ADDQr), reg_store)
923 .addReg(reg_res).addReg(reg_v2);
927 case Alpha::SWAP64: {
928 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
929 .addReg(reg_v2).addReg(reg_v2);
933 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::STL_C : Alpha::STQ_C), reg_store)
934 .addReg(reg_store).addImm(0).addReg(reg_ptr);
935 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
936 .addImm(0).addReg(reg_store).addMBB(llscMBB);
937 BuildMI(llscMBB, dl, TII->get(Alpha::BR)).addMBB(sinkMBB);
939 thisMBB->addSuccessor(llscMBB);
940 llscMBB->addSuccessor(llscMBB);
941 llscMBB->addSuccessor(sinkMBB);
942 MI->eraseFromParent(); // The pseudo instruction is gone now.
948 AlphaTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
949 // The Alpha target isn't yet aware of offsets.
953 bool AlphaTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
954 if (VT != MVT::f32 && VT != MVT::f64)
960 return Imm.isZero() || Imm.isNegZero();