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::SETCC, MVT::f32, Promote);
127 setOperationAction(ISD::BITCAST, MVT::f32, Promote);
129 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
131 // Not implemented yet.
132 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
133 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
134 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
136 // We want to legalize GlobalAddress and ConstantPool and
137 // ExternalSymbols nodes into the appropriate instructions to
138 // materialize the address.
139 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
140 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
141 setOperationAction(ISD::ExternalSymbol, MVT::i64, Custom);
142 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
144 setOperationAction(ISD::VASTART, MVT::Other, Custom);
145 setOperationAction(ISD::VAEND, MVT::Other, Expand);
146 setOperationAction(ISD::VACOPY, MVT::Other, Custom);
147 setOperationAction(ISD::VAARG, MVT::Other, Custom);
148 setOperationAction(ISD::VAARG, MVT::i32, Custom);
150 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
151 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
153 setStackPointerRegisterToSaveRestore(Alpha::R30);
156 setJumpBufAlignment(16);
158 setMinFunctionAlignment(4);
160 computeRegisterProperties();
163 MVT::SimpleValueType AlphaTargetLowering::getSetCCResultType(EVT VT) const {
167 const char *AlphaTargetLowering::getTargetNodeName(unsigned Opcode) const {
170 case AlphaISD::CVTQT_: return "Alpha::CVTQT_";
171 case AlphaISD::CVTQS_: return "Alpha::CVTQS_";
172 case AlphaISD::CVTTQ_: return "Alpha::CVTTQ_";
173 case AlphaISD::GPRelHi: return "Alpha::GPRelHi";
174 case AlphaISD::GPRelLo: return "Alpha::GPRelLo";
175 case AlphaISD::RelLit: return "Alpha::RelLit";
176 case AlphaISD::GlobalRetAddr: return "Alpha::GlobalRetAddr";
177 case AlphaISD::CALL: return "Alpha::CALL";
178 case AlphaISD::DivCall: return "Alpha::DivCall";
179 case AlphaISD::RET_FLAG: return "Alpha::RET_FLAG";
180 case AlphaISD::COND_BRANCH_I: return "Alpha::COND_BRANCH_I";
181 case AlphaISD::COND_BRANCH_F: return "Alpha::COND_BRANCH_F";
185 static SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) {
186 EVT PtrVT = Op.getValueType();
187 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
188 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
189 // FIXME there isn't really any debug info here
190 DebugLoc dl = Op.getDebugLoc();
192 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, JTI,
193 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
194 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, JTI, Hi);
198 //http://www.cs.arizona.edu/computer.help/policy/DIGITAL_unix/
199 //AA-PY8AC-TET1_html/callCH3.html#BLOCK21
201 //For now, just use variable size stack frame format
203 //In a standard call, the first six items are passed in registers $16
204 //- $21 and/or registers $f16 - $f21. (See Section 4.1.2 for details
205 //of argument-to-register correspondence.) The remaining items are
206 //collected in a memory argument list that is a naturally aligned
207 //array of quadwords. In a standard call, this list, if present, must
208 //be passed at 0(SP).
209 //7 ... n 0(SP) ... (n-7)*8(SP)
217 #include "AlphaGenCallingConv.inc"
220 AlphaTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
221 CallingConv::ID CallConv, bool isVarArg,
223 const SmallVectorImpl<ISD::OutputArg> &Outs,
224 const SmallVectorImpl<SDValue> &OutVals,
225 const SmallVectorImpl<ISD::InputArg> &Ins,
226 DebugLoc dl, SelectionDAG &DAG,
227 SmallVectorImpl<SDValue> &InVals) const {
228 // Alpha target does not yet support tail call optimization.
231 // Analyze operands of the call, assigning locations to each operand.
232 SmallVector<CCValAssign, 16> ArgLocs;
233 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
234 getTargetMachine(), ArgLocs, *DAG.getContext());
236 CCInfo.AnalyzeCallOperands(Outs, CC_Alpha);
238 // Get a count of how many bytes are to be pushed on the stack.
239 unsigned NumBytes = CCInfo.getNextStackOffset();
241 Chain = DAG.getCALLSEQ_START(Chain, DAG.getConstant(NumBytes,
242 getPointerTy(), true));
244 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
245 SmallVector<SDValue, 12> MemOpChains;
248 // Walk the register/memloc assignments, inserting copies/loads.
249 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
250 CCValAssign &VA = ArgLocs[i];
252 SDValue Arg = OutVals[i];
254 // Promote the value if needed.
255 switch (VA.getLocInfo()) {
256 default: assert(0 && "Unknown loc info!");
257 case CCValAssign::Full: break;
258 case CCValAssign::SExt:
259 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
261 case CCValAssign::ZExt:
262 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
264 case CCValAssign::AExt:
265 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
269 // Arguments that can be passed on register must be kept at RegsToPass
272 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
274 assert(VA.isMemLoc());
276 if (StackPtr.getNode() == 0)
277 StackPtr = DAG.getCopyFromReg(Chain, dl, Alpha::R30, MVT::i64);
279 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
281 DAG.getIntPtrConstant(VA.getLocMemOffset()));
283 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
284 MachinePointerInfo(),false, false, 0));
288 // Transform all store nodes into one single node because all store nodes are
289 // independent of each other.
290 if (!MemOpChains.empty())
291 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
292 &MemOpChains[0], MemOpChains.size());
294 // Build a sequence of copy-to-reg nodes chained together with token chain and
295 // flag operands which copy the outgoing args into registers. The InFlag in
296 // necessary since all emitted instructions must be stuck together.
298 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
299 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
300 RegsToPass[i].second, InFlag);
301 InFlag = Chain.getValue(1);
304 // Returns a chain & a flag for retval copy to use.
305 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
306 SmallVector<SDValue, 8> Ops;
307 Ops.push_back(Chain);
308 Ops.push_back(Callee);
310 // Add argument registers to the end of the list so that they are
311 // known live into the call.
312 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
313 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
314 RegsToPass[i].second.getValueType()));
316 if (InFlag.getNode())
317 Ops.push_back(InFlag);
319 Chain = DAG.getNode(AlphaISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
320 InFlag = Chain.getValue(1);
322 // Create the CALLSEQ_END node.
323 Chain = DAG.getCALLSEQ_END(Chain,
324 DAG.getConstant(NumBytes, getPointerTy(), true),
325 DAG.getConstant(0, getPointerTy(), true),
327 InFlag = Chain.getValue(1);
329 // Handle result values, copying them out of physregs into vregs that we
331 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
332 Ins, dl, DAG, InVals);
335 /// LowerCallResult - Lower the result values of a call into the
336 /// appropriate copies out of appropriate physical registers.
339 AlphaTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
340 CallingConv::ID CallConv, bool isVarArg,
341 const SmallVectorImpl<ISD::InputArg> &Ins,
342 DebugLoc dl, SelectionDAG &DAG,
343 SmallVectorImpl<SDValue> &InVals) const {
345 // Assign locations to each value returned by this call.
346 SmallVector<CCValAssign, 16> RVLocs;
347 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
348 getTargetMachine(), RVLocs, *DAG.getContext());
350 CCInfo.AnalyzeCallResult(Ins, RetCC_Alpha);
352 // Copy all of the result registers out of their specified physreg.
353 for (unsigned i = 0; i != RVLocs.size(); ++i) {
354 CCValAssign &VA = RVLocs[i];
356 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
357 VA.getLocVT(), InFlag).getValue(1);
358 SDValue RetValue = Chain.getValue(0);
359 InFlag = Chain.getValue(2);
361 // If this is an 8/16/32-bit value, it is really passed promoted to 64
362 // bits. Insert an assert[sz]ext to capture this, then truncate to the
364 if (VA.getLocInfo() == CCValAssign::SExt)
365 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
366 DAG.getValueType(VA.getValVT()));
367 else if (VA.getLocInfo() == CCValAssign::ZExt)
368 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
369 DAG.getValueType(VA.getValVT()));
371 if (VA.getLocInfo() != CCValAssign::Full)
372 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
374 InVals.push_back(RetValue);
381 AlphaTargetLowering::LowerFormalArguments(SDValue Chain,
382 CallingConv::ID CallConv, bool isVarArg,
383 const SmallVectorImpl<ISD::InputArg>
385 DebugLoc dl, SelectionDAG &DAG,
386 SmallVectorImpl<SDValue> &InVals)
389 MachineFunction &MF = DAG.getMachineFunction();
390 MachineFrameInfo *MFI = MF.getFrameInfo();
391 AlphaMachineFunctionInfo *FuncInfo = MF.getInfo<AlphaMachineFunctionInfo>();
393 unsigned args_int[] = {
394 Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21};
395 unsigned args_float[] = {
396 Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21};
398 for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
400 EVT ObjectVT = Ins[ArgNo].VT;
404 switch (ObjectVT.getSimpleVT().SimpleTy) {
406 assert(false && "Invalid value type!");
408 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
409 &Alpha::F8RCRegClass);
410 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
413 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
414 &Alpha::F4RCRegClass);
415 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
418 args_int[ArgNo] = AddLiveIn(MF, args_int[ArgNo],
419 &Alpha::GPRCRegClass);
420 ArgVal = DAG.getCopyFromReg(Chain, dl, args_int[ArgNo], MVT::i64);
424 // Create the frame index object for this incoming parameter...
425 int FI = MFI->CreateFixedObject(8, 8 * (ArgNo - 6), true);
427 // Create the SelectionDAG nodes corresponding to a load
428 //from this parameter
429 SDValue FIN = DAG.getFrameIndex(FI, MVT::i64);
430 ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, MachinePointerInfo(),
433 InVals.push_back(ArgVal);
436 // If the functions takes variable number of arguments, copy all regs to stack
438 FuncInfo->setVarArgsOffset(Ins.size() * 8);
439 std::vector<SDValue> LS;
440 for (int i = 0; i < 6; ++i) {
441 if (TargetRegisterInfo::isPhysicalRegister(args_int[i]))
442 args_int[i] = AddLiveIn(MF, args_int[i], &Alpha::GPRCRegClass);
443 SDValue argt = DAG.getCopyFromReg(Chain, dl, args_int[i], MVT::i64);
444 int FI = MFI->CreateFixedObject(8, -8 * (6 - i), true);
445 if (i == 0) FuncInfo->setVarArgsBase(FI);
446 SDValue SDFI = DAG.getFrameIndex(FI, MVT::i64);
447 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, MachinePointerInfo(),
450 if (TargetRegisterInfo::isPhysicalRegister(args_float[i]))
451 args_float[i] = AddLiveIn(MF, args_float[i], &Alpha::F8RCRegClass);
452 argt = DAG.getCopyFromReg(Chain, dl, args_float[i], MVT::f64);
453 FI = MFI->CreateFixedObject(8, - 8 * (12 - i), true);
454 SDFI = DAG.getFrameIndex(FI, MVT::i64);
455 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, MachinePointerInfo(),
459 //Set up a token factor with all the stack traffic
460 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &LS[0], LS.size());
467 AlphaTargetLowering::LowerReturn(SDValue Chain,
468 CallingConv::ID CallConv, bool isVarArg,
469 const SmallVectorImpl<ISD::OutputArg> &Outs,
470 const SmallVectorImpl<SDValue> &OutVals,
471 DebugLoc dl, SelectionDAG &DAG) const {
473 SDValue Copy = DAG.getCopyToReg(Chain, dl, Alpha::R26,
474 DAG.getNode(AlphaISD::GlobalRetAddr,
475 DebugLoc(), MVT::i64),
477 switch (Outs.size()) {
479 llvm_unreachable("Do not know how to return this many arguments!");
482 //return SDValue(); // ret void is legal
484 EVT ArgVT = Outs[0].VT;
486 if (ArgVT.isInteger())
489 assert(ArgVT.isFloatingPoint());
492 Copy = DAG.getCopyToReg(Copy, dl, ArgReg,
493 OutVals[0], Copy.getValue(1));
494 if (DAG.getMachineFunction().getRegInfo().liveout_empty())
495 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg);
499 EVT ArgVT = Outs[0].VT;
500 unsigned ArgReg1, ArgReg2;
501 if (ArgVT.isInteger()) {
505 assert(ArgVT.isFloatingPoint());
509 Copy = DAG.getCopyToReg(Copy, dl, ArgReg1,
510 OutVals[0], Copy.getValue(1));
511 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
512 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg1)
513 == DAG.getMachineFunction().getRegInfo().liveout_end())
514 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg1);
515 Copy = DAG.getCopyToReg(Copy, dl, ArgReg2,
516 OutVals[1], Copy.getValue(1));
517 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
518 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg2)
519 == DAG.getMachineFunction().getRegInfo().liveout_end())
520 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg2);
524 return DAG.getNode(AlphaISD::RET_FLAG, dl,
525 MVT::Other, Copy, Copy.getValue(1));
528 void AlphaTargetLowering::LowerVAARG(SDNode *N, SDValue &Chain,
530 SelectionDAG &DAG) const {
531 Chain = N->getOperand(0);
532 SDValue VAListP = N->getOperand(1);
533 const Value *VAListS = cast<SrcValueSDNode>(N->getOperand(2))->getValue();
534 DebugLoc dl = N->getDebugLoc();
536 SDValue Base = DAG.getLoad(MVT::i64, dl, Chain, VAListP,
537 MachinePointerInfo(VAListS),
539 SDValue Tmp = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
540 DAG.getConstant(8, MVT::i64));
541 SDValue Offset = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Base.getValue(1),
542 Tmp, MachinePointerInfo(),
543 MVT::i32, false, false, 0);
544 DataPtr = DAG.getNode(ISD::ADD, dl, MVT::i64, Base, Offset);
545 if (N->getValueType(0).isFloatingPoint())
547 //if fp && Offset < 6*8, then subtract 6*8 from DataPtr
548 SDValue FPDataPtr = DAG.getNode(ISD::SUB, dl, MVT::i64, DataPtr,
549 DAG.getConstant(8*6, MVT::i64));
550 SDValue CC = DAG.getSetCC(dl, MVT::i64, Offset,
551 DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
552 DataPtr = DAG.getNode(ISD::SELECT, dl, MVT::i64, CC, FPDataPtr, DataPtr);
555 SDValue NewOffset = DAG.getNode(ISD::ADD, dl, MVT::i64, Offset,
556 DAG.getConstant(8, MVT::i64));
557 Chain = DAG.getTruncStore(Offset.getValue(1), dl, NewOffset, Tmp,
558 MachinePointerInfo(),
559 MVT::i32, false, false, 0);
562 /// LowerOperation - Provide custom lowering hooks for some operations.
564 SDValue AlphaTargetLowering::LowerOperation(SDValue Op,
565 SelectionDAG &DAG) const {
566 DebugLoc dl = Op.getDebugLoc();
567 switch (Op.getOpcode()) {
568 default: llvm_unreachable("Wasn't expecting to be able to lower this!");
569 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
571 case ISD::INTRINSIC_WO_CHAIN: {
572 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
574 default: break; // Don't custom lower most intrinsics.
575 case Intrinsic::alpha_umulh:
576 return DAG.getNode(ISD::MULHU, dl, MVT::i64,
577 Op.getOperand(1), Op.getOperand(2));
581 case ISD::SRL_PARTS: {
582 SDValue ShOpLo = Op.getOperand(0);
583 SDValue ShOpHi = Op.getOperand(1);
584 SDValue ShAmt = Op.getOperand(2);
585 SDValue bm = DAG.getNode(ISD::SUB, dl, MVT::i64,
586 DAG.getConstant(64, MVT::i64), ShAmt);
587 SDValue BMCC = DAG.getSetCC(dl, MVT::i64, bm,
588 DAG.getConstant(0, MVT::i64), ISD::SETLE);
589 // if 64 - shAmt <= 0
590 SDValue Hi_Neg = DAG.getConstant(0, MVT::i64);
591 SDValue ShAmt_Neg = DAG.getNode(ISD::SUB, dl, MVT::i64,
592 DAG.getConstant(0, MVT::i64), bm);
593 SDValue Lo_Neg = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt_Neg);
595 SDValue carries = DAG.getNode(ISD::SHL, dl, MVT::i64, ShOpHi, bm);
596 SDValue Hi_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt);
597 SDValue Lo_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpLo, ShAmt);
598 Lo_Pos = DAG.getNode(ISD::OR, dl, MVT::i64, Lo_Pos, carries);
600 SDValue Hi = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Hi_Neg, Hi_Pos);
601 SDValue Lo = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Lo_Neg, Lo_Pos);
602 SDValue Ops[2] = { Lo, Hi };
603 return DAG.getMergeValues(Ops, 2, dl);
605 // case ISD::SRA_PARTS:
607 // case ISD::SHL_PARTS:
610 case ISD::SINT_TO_FP: {
611 assert(Op.getOperand(0).getValueType() == MVT::i64 &&
612 "Unhandled SINT_TO_FP type in custom expander!");
614 bool isDouble = Op.getValueType() == MVT::f64;
615 LD = DAG.getNode(ISD::BITCAST, dl, MVT::f64, Op.getOperand(0));
616 SDValue FP = DAG.getNode(isDouble?AlphaISD::CVTQT_:AlphaISD::CVTQS_, dl,
617 isDouble?MVT::f64:MVT::f32, LD);
620 case ISD::FP_TO_SINT: {
621 bool isDouble = Op.getOperand(0).getValueType() == MVT::f64;
622 SDValue src = Op.getOperand(0);
624 if (!isDouble) //Promote
625 src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, src);
627 src = DAG.getNode(AlphaISD::CVTTQ_, dl, MVT::f64, src);
629 return DAG.getNode(ISD::BITCAST, dl, MVT::i64, src);
631 case ISD::ConstantPool: {
632 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
633 const Constant *C = CP->getConstVal();
634 SDValue CPI = DAG.getTargetConstantPool(C, MVT::i64, CP->getAlignment());
635 // FIXME there isn't really any debug info here
637 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, CPI,
638 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
639 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, CPI, Hi);
642 case ISD::GlobalTLSAddress:
643 llvm_unreachable("TLS not implemented for Alpha.");
644 case ISD::GlobalAddress: {
645 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
646 const GlobalValue *GV = GSDN->getGlobal();
647 SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i64,
649 // FIXME there isn't really any debug info here
651 // if (!GV->hasWeakLinkage() && !GV->isDeclaration()
652 // && !GV->hasLinkOnceLinkage()) {
653 if (GV->hasLocalLinkage()) {
654 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, GA,
655 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
656 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, GA, Hi);
659 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64, GA,
660 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
662 case ISD::ExternalSymbol: {
663 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64,
664 DAG.getTargetExternalSymbol(cast<ExternalSymbolSDNode>(Op)
665 ->getSymbol(), MVT::i64),
666 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
671 //Expand only on constant case
672 if (Op.getOperand(1).getOpcode() == ISD::Constant) {
673 EVT VT = Op.getNode()->getValueType(0);
674 SDValue Tmp1 = Op.getNode()->getOpcode() == ISD::UREM ?
675 BuildUDIV(Op.getNode(), DAG, NULL) :
676 BuildSDIV(Op.getNode(), DAG, NULL);
677 Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Op.getOperand(1));
678 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Op.getOperand(0), Tmp1);
684 if (Op.getValueType().isInteger()) {
685 if (Op.getOperand(1).getOpcode() == ISD::Constant)
686 return Op.getOpcode() == ISD::SDIV ? BuildSDIV(Op.getNode(), DAG, NULL)
687 : BuildUDIV(Op.getNode(), DAG, NULL);
688 const char* opstr = 0;
689 switch (Op.getOpcode()) {
690 case ISD::UREM: opstr = "__remqu"; break;
691 case ISD::SREM: opstr = "__remq"; break;
692 case ISD::UDIV: opstr = "__divqu"; break;
693 case ISD::SDIV: opstr = "__divq"; break;
695 SDValue Tmp1 = Op.getOperand(0),
696 Tmp2 = Op.getOperand(1),
697 Addr = DAG.getExternalSymbol(opstr, MVT::i64);
698 return DAG.getNode(AlphaISD::DivCall, dl, MVT::i64, Addr, Tmp1, Tmp2);
703 SDValue Chain, DataPtr;
704 LowerVAARG(Op.getNode(), Chain, DataPtr, DAG);
707 if (Op.getValueType() == MVT::i32)
708 Result = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Chain, DataPtr,
709 MachinePointerInfo(), MVT::i32, false, false, 0);
711 Result = DAG.getLoad(Op.getValueType(), dl, Chain, DataPtr,
712 MachinePointerInfo(),
717 SDValue Chain = Op.getOperand(0);
718 SDValue DestP = Op.getOperand(1);
719 SDValue SrcP = Op.getOperand(2);
720 const Value *DestS = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
721 const Value *SrcS = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
723 SDValue Val = DAG.getLoad(getPointerTy(), dl, Chain, SrcP,
724 MachinePointerInfo(SrcS),
726 SDValue Result = DAG.getStore(Val.getValue(1), dl, Val, DestP,
727 MachinePointerInfo(DestS),
729 SDValue NP = DAG.getNode(ISD::ADD, dl, MVT::i64, SrcP,
730 DAG.getConstant(8, MVT::i64));
731 Val = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Result,
732 NP, MachinePointerInfo(), MVT::i32, false, false, 0);
733 SDValue NPD = DAG.getNode(ISD::ADD, dl, MVT::i64, DestP,
734 DAG.getConstant(8, MVT::i64));
735 return DAG.getTruncStore(Val.getValue(1), dl, Val, NPD,
736 MachinePointerInfo(), MVT::i32,
740 MachineFunction &MF = DAG.getMachineFunction();
741 AlphaMachineFunctionInfo *FuncInfo = MF.getInfo<AlphaMachineFunctionInfo>();
743 SDValue Chain = Op.getOperand(0);
744 SDValue VAListP = Op.getOperand(1);
745 const Value *VAListS = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
747 // vastart stores the address of the VarArgsBase and VarArgsOffset
748 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsBase(), MVT::i64);
749 SDValue S1 = DAG.getStore(Chain, dl, FR, VAListP,
750 MachinePointerInfo(VAListS), false, false, 0);
751 SDValue SA2 = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
752 DAG.getConstant(8, MVT::i64));
753 return DAG.getTruncStore(S1, dl,
754 DAG.getConstant(FuncInfo->getVarArgsOffset(),
756 SA2, MachinePointerInfo(),
757 MVT::i32, false, false, 0);
759 case ISD::RETURNADDR:
760 return DAG.getNode(AlphaISD::GlobalRetAddr, DebugLoc(), MVT::i64);
762 case ISD::FRAMEADDR: break;
768 void AlphaTargetLowering::ReplaceNodeResults(SDNode *N,
769 SmallVectorImpl<SDValue>&Results,
770 SelectionDAG &DAG) const {
771 DebugLoc dl = N->getDebugLoc();
772 assert(N->getValueType(0) == MVT::i32 &&
773 N->getOpcode() == ISD::VAARG &&
774 "Unknown node to custom promote!");
776 SDValue Chain, DataPtr;
777 LowerVAARG(N, Chain, DataPtr, DAG);
778 SDValue Res = DAG.getLoad(N->getValueType(0), dl, Chain, DataPtr,
779 MachinePointerInfo(),
781 Results.push_back(Res);
782 Results.push_back(SDValue(Res.getNode(), 1));
788 /// getConstraintType - Given a constraint letter, return the type of
789 /// constraint it is for this target.
790 AlphaTargetLowering::ConstraintType
791 AlphaTargetLowering::getConstraintType(const std::string &Constraint) const {
792 if (Constraint.size() == 1) {
793 switch (Constraint[0]) {
797 return C_RegisterClass;
800 return TargetLowering::getConstraintType(Constraint);
803 /// Examine constraint type and operand type and determine a weight value.
804 /// This object must already have been set up with the operand type
805 /// and the current alternative constraint selected.
806 TargetLowering::ConstraintWeight
807 AlphaTargetLowering::getSingleConstraintMatchWeight(
808 AsmOperandInfo &info, const char *constraint) const {
809 ConstraintWeight weight = CW_Invalid;
810 Value *CallOperandVal = info.CallOperandVal;
811 // If we don't have a value, we can't do a match,
812 // but allow it at the lowest weight.
813 if (CallOperandVal == NULL)
815 // Look at the constraint type.
816 switch (*constraint) {
818 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
821 weight = CW_Register;
827 /// Given a register class constraint, like 'r', if this corresponds directly
828 /// to an LLVM register class, return a register of 0 and the register class
830 std::pair<unsigned, const TargetRegisterClass*> AlphaTargetLowering::
831 getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const
833 if (Constraint.size() == 1) {
834 switch (Constraint[0]) {
836 return std::make_pair(0U, Alpha::GPRCRegisterClass);
838 return VT == MVT::f64 ? std::make_pair(0U, Alpha::F8RCRegisterClass) :
839 std::make_pair(0U, Alpha::F4RCRegisterClass);
842 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
845 //===----------------------------------------------------------------------===//
846 // Other Lowering Code
847 //===----------------------------------------------------------------------===//
850 AlphaTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
851 MachineBasicBlock *BB) const {
852 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
853 assert((MI->getOpcode() == Alpha::CAS32 ||
854 MI->getOpcode() == Alpha::CAS64 ||
855 MI->getOpcode() == Alpha::LAS32 ||
856 MI->getOpcode() == Alpha::LAS64 ||
857 MI->getOpcode() == Alpha::SWAP32 ||
858 MI->getOpcode() == Alpha::SWAP64) &&
859 "Unexpected instr type to insert");
861 bool is32 = MI->getOpcode() == Alpha::CAS32 ||
862 MI->getOpcode() == Alpha::LAS32 ||
863 MI->getOpcode() == Alpha::SWAP32;
865 //Load locked store conditional for atomic ops take on the same form
868 //do stuff (maybe branch to exit)
870 //test sc and maybe branck to start
872 const BasicBlock *LLVM_BB = BB->getBasicBlock();
873 DebugLoc dl = MI->getDebugLoc();
874 MachineFunction::iterator It = BB;
877 MachineBasicBlock *thisMBB = BB;
878 MachineFunction *F = BB->getParent();
879 MachineBasicBlock *llscMBB = F->CreateMachineBasicBlock(LLVM_BB);
880 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
882 sinkMBB->splice(sinkMBB->begin(), thisMBB,
883 llvm::next(MachineBasicBlock::iterator(MI)),
885 sinkMBB->transferSuccessorsAndUpdatePHIs(thisMBB);
887 F->insert(It, llscMBB);
888 F->insert(It, sinkMBB);
890 BuildMI(thisMBB, dl, TII->get(Alpha::BR)).addMBB(llscMBB);
892 unsigned reg_res = MI->getOperand(0).getReg(),
893 reg_ptr = MI->getOperand(1).getReg(),
894 reg_v2 = MI->getOperand(2).getReg(),
895 reg_store = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
897 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::LDL_L : Alpha::LDQ_L),
898 reg_res).addImm(0).addReg(reg_ptr);
899 switch (MI->getOpcode()) {
903 = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
904 BuildMI(llscMBB, dl, TII->get(Alpha::CMPEQ), reg_cmp)
905 .addReg(reg_v2).addReg(reg_res);
906 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
907 .addImm(0).addReg(reg_cmp).addMBB(sinkMBB);
908 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
909 .addReg(Alpha::R31).addReg(MI->getOperand(3).getReg());
914 BuildMI(llscMBB, dl,TII->get(is32 ? Alpha::ADDLr : Alpha::ADDQr), reg_store)
915 .addReg(reg_res).addReg(reg_v2);
919 case Alpha::SWAP64: {
920 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
921 .addReg(reg_v2).addReg(reg_v2);
925 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::STL_C : Alpha::STQ_C), reg_store)
926 .addReg(reg_store).addImm(0).addReg(reg_ptr);
927 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
928 .addImm(0).addReg(reg_store).addMBB(llscMBB);
929 BuildMI(llscMBB, dl, TII->get(Alpha::BR)).addMBB(sinkMBB);
931 thisMBB->addSuccessor(llscMBB);
932 llscMBB->addSuccessor(llscMBB);
933 llscMBB->addSuccessor(sinkMBB);
934 MI->eraseFromParent(); // The pseudo instruction is gone now.
940 AlphaTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
941 // The Alpha target isn't yet aware of offsets.
945 bool AlphaTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
946 if (VT != MVT::f32 && VT != MVT::f64)
952 return Imm.isZero() || Imm.isNegZero();