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 setStackPointerRegisterToSaveRestore(Alpha::R30);
159 setJumpBufAlignment(16);
161 setMinFunctionAlignment(4);
163 setInsertFencesForAtomic(true);
165 computeRegisterProperties();
168 MVT::SimpleValueType AlphaTargetLowering::getSetCCResultType(EVT VT) const {
172 const char *AlphaTargetLowering::getTargetNodeName(unsigned Opcode) const {
175 case AlphaISD::CVTQT_: return "Alpha::CVTQT_";
176 case AlphaISD::CVTQS_: return "Alpha::CVTQS_";
177 case AlphaISD::CVTTQ_: return "Alpha::CVTTQ_";
178 case AlphaISD::GPRelHi: return "Alpha::GPRelHi";
179 case AlphaISD::GPRelLo: return "Alpha::GPRelLo";
180 case AlphaISD::RelLit: return "Alpha::RelLit";
181 case AlphaISD::GlobalRetAddr: return "Alpha::GlobalRetAddr";
182 case AlphaISD::CALL: return "Alpha::CALL";
183 case AlphaISD::DivCall: return "Alpha::DivCall";
184 case AlphaISD::RET_FLAG: return "Alpha::RET_FLAG";
185 case AlphaISD::COND_BRANCH_I: return "Alpha::COND_BRANCH_I";
186 case AlphaISD::COND_BRANCH_F: return "Alpha::COND_BRANCH_F";
190 static SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) {
191 EVT PtrVT = Op.getValueType();
192 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
193 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), 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 #include "AlphaGenCallingConv.inc"
225 AlphaTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
226 CallingConv::ID CallConv, bool isVarArg,
228 const SmallVectorImpl<ISD::OutputArg> &Outs,
229 const SmallVectorImpl<SDValue> &OutVals,
230 const SmallVectorImpl<ISD::InputArg> &Ins,
231 DebugLoc dl, SelectionDAG &DAG,
232 SmallVectorImpl<SDValue> &InVals) const {
233 // Alpha target does not yet support tail call optimization.
236 // Analyze operands of the call, assigning locations to each operand.
237 SmallVector<CCValAssign, 16> ArgLocs;
238 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
239 getTargetMachine(), ArgLocs, *DAG.getContext());
241 CCInfo.AnalyzeCallOperands(Outs, CC_Alpha);
243 // Get a count of how many bytes are to be pushed on the stack.
244 unsigned NumBytes = CCInfo.getNextStackOffset();
246 Chain = DAG.getCALLSEQ_START(Chain, DAG.getConstant(NumBytes,
247 getPointerTy(), true));
249 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
250 SmallVector<SDValue, 12> MemOpChains;
253 // Walk the register/memloc assignments, inserting copies/loads.
254 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
255 CCValAssign &VA = ArgLocs[i];
257 SDValue Arg = OutVals[i];
259 // Promote the value if needed.
260 switch (VA.getLocInfo()) {
261 default: assert(0 && "Unknown loc info!");
262 case CCValAssign::Full: break;
263 case CCValAssign::SExt:
264 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
266 case CCValAssign::ZExt:
267 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
269 case CCValAssign::AExt:
270 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
274 // Arguments that can be passed on register must be kept at RegsToPass
277 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
279 assert(VA.isMemLoc());
281 if (StackPtr.getNode() == 0)
282 StackPtr = DAG.getCopyFromReg(Chain, dl, Alpha::R30, MVT::i64);
284 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
286 DAG.getIntPtrConstant(VA.getLocMemOffset()));
288 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
289 MachinePointerInfo(),false, false, 0));
293 // Transform all store nodes into one single node because all store nodes are
294 // independent of each other.
295 if (!MemOpChains.empty())
296 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
297 &MemOpChains[0], MemOpChains.size());
299 // Build a sequence of copy-to-reg nodes chained together with token chain and
300 // flag operands which copy the outgoing args into registers. The InFlag in
301 // necessary since all emitted instructions must be stuck together.
303 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
304 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
305 RegsToPass[i].second, InFlag);
306 InFlag = Chain.getValue(1);
309 // Returns a chain & a flag for retval copy to use.
310 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
311 SmallVector<SDValue, 8> Ops;
312 Ops.push_back(Chain);
313 Ops.push_back(Callee);
315 // Add argument registers to the end of the list so that they are
316 // known live into the call.
317 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
318 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
319 RegsToPass[i].second.getValueType()));
321 if (InFlag.getNode())
322 Ops.push_back(InFlag);
324 Chain = DAG.getNode(AlphaISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
325 InFlag = Chain.getValue(1);
327 // Create the CALLSEQ_END node.
328 Chain = DAG.getCALLSEQ_END(Chain,
329 DAG.getConstant(NumBytes, getPointerTy(), true),
330 DAG.getConstant(0, getPointerTy(), true),
332 InFlag = Chain.getValue(1);
334 // Handle result values, copying them out of physregs into vregs that we
336 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
337 Ins, dl, DAG, InVals);
340 /// LowerCallResult - Lower the result values of a call into the
341 /// appropriate copies out of appropriate physical registers.
344 AlphaTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
345 CallingConv::ID CallConv, bool isVarArg,
346 const SmallVectorImpl<ISD::InputArg> &Ins,
347 DebugLoc dl, SelectionDAG &DAG,
348 SmallVectorImpl<SDValue> &InVals) const {
350 // Assign locations to each value returned by this call.
351 SmallVector<CCValAssign, 16> RVLocs;
352 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
353 getTargetMachine(), RVLocs, *DAG.getContext());
355 CCInfo.AnalyzeCallResult(Ins, RetCC_Alpha);
357 // Copy all of the result registers out of their specified physreg.
358 for (unsigned i = 0; i != RVLocs.size(); ++i) {
359 CCValAssign &VA = RVLocs[i];
361 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
362 VA.getLocVT(), InFlag).getValue(1);
363 SDValue RetValue = Chain.getValue(0);
364 InFlag = Chain.getValue(2);
366 // If this is an 8/16/32-bit value, it is really passed promoted to 64
367 // bits. Insert an assert[sz]ext to capture this, then truncate to the
369 if (VA.getLocInfo() == CCValAssign::SExt)
370 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
371 DAG.getValueType(VA.getValVT()));
372 else if (VA.getLocInfo() == CCValAssign::ZExt)
373 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
374 DAG.getValueType(VA.getValVT()));
376 if (VA.getLocInfo() != CCValAssign::Full)
377 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
379 InVals.push_back(RetValue);
386 AlphaTargetLowering::LowerFormalArguments(SDValue Chain,
387 CallingConv::ID CallConv, bool isVarArg,
388 const SmallVectorImpl<ISD::InputArg>
390 DebugLoc dl, SelectionDAG &DAG,
391 SmallVectorImpl<SDValue> &InVals)
394 MachineFunction &MF = DAG.getMachineFunction();
395 MachineFrameInfo *MFI = MF.getFrameInfo();
396 AlphaMachineFunctionInfo *FuncInfo = MF.getInfo<AlphaMachineFunctionInfo>();
398 unsigned args_int[] = {
399 Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21};
400 unsigned args_float[] = {
401 Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21};
403 for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
405 EVT ObjectVT = Ins[ArgNo].VT;
409 switch (ObjectVT.getSimpleVT().SimpleTy) {
411 assert(false && "Invalid value type!");
413 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
414 &Alpha::F8RCRegClass);
415 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
418 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
419 &Alpha::F4RCRegClass);
420 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
423 args_int[ArgNo] = AddLiveIn(MF, args_int[ArgNo],
424 &Alpha::GPRCRegClass);
425 ArgVal = DAG.getCopyFromReg(Chain, dl, args_int[ArgNo], MVT::i64);
429 // Create the frame index object for this incoming parameter...
430 int FI = MFI->CreateFixedObject(8, 8 * (ArgNo - 6), true);
432 // Create the SelectionDAG nodes corresponding to a load
433 //from this parameter
434 SDValue FIN = DAG.getFrameIndex(FI, MVT::i64);
435 ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, MachinePointerInfo(),
438 InVals.push_back(ArgVal);
441 // If the functions takes variable number of arguments, copy all regs to stack
443 FuncInfo->setVarArgsOffset(Ins.size() * 8);
444 std::vector<SDValue> LS;
445 for (int i = 0; i < 6; ++i) {
446 if (TargetRegisterInfo::isPhysicalRegister(args_int[i]))
447 args_int[i] = AddLiveIn(MF, args_int[i], &Alpha::GPRCRegClass);
448 SDValue argt = DAG.getCopyFromReg(Chain, dl, args_int[i], MVT::i64);
449 int FI = MFI->CreateFixedObject(8, -8 * (6 - i), true);
450 if (i == 0) FuncInfo->setVarArgsBase(FI);
451 SDValue SDFI = DAG.getFrameIndex(FI, MVT::i64);
452 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, MachinePointerInfo(),
455 if (TargetRegisterInfo::isPhysicalRegister(args_float[i]))
456 args_float[i] = AddLiveIn(MF, args_float[i], &Alpha::F8RCRegClass);
457 argt = DAG.getCopyFromReg(Chain, dl, args_float[i], MVT::f64);
458 FI = MFI->CreateFixedObject(8, - 8 * (12 - i), true);
459 SDFI = DAG.getFrameIndex(FI, MVT::i64);
460 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, MachinePointerInfo(),
464 //Set up a token factor with all the stack traffic
465 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &LS[0], LS.size());
472 AlphaTargetLowering::LowerReturn(SDValue Chain,
473 CallingConv::ID CallConv, bool isVarArg,
474 const SmallVectorImpl<ISD::OutputArg> &Outs,
475 const SmallVectorImpl<SDValue> &OutVals,
476 DebugLoc dl, SelectionDAG &DAG) const {
478 SDValue Copy = DAG.getCopyToReg(Chain, dl, Alpha::R26,
479 DAG.getNode(AlphaISD::GlobalRetAddr,
480 DebugLoc(), MVT::i64),
482 switch (Outs.size()) {
484 llvm_unreachable("Do not know how to return this many arguments!");
487 //return SDValue(); // ret void is legal
489 EVT ArgVT = Outs[0].VT;
491 if (ArgVT.isInteger())
494 assert(ArgVT.isFloatingPoint());
497 Copy = DAG.getCopyToReg(Copy, dl, ArgReg,
498 OutVals[0], Copy.getValue(1));
499 if (DAG.getMachineFunction().getRegInfo().liveout_empty())
500 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg);
504 EVT ArgVT = Outs[0].VT;
505 unsigned ArgReg1, ArgReg2;
506 if (ArgVT.isInteger()) {
510 assert(ArgVT.isFloatingPoint());
514 Copy = DAG.getCopyToReg(Copy, dl, ArgReg1,
515 OutVals[0], Copy.getValue(1));
516 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
517 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg1)
518 == DAG.getMachineFunction().getRegInfo().liveout_end())
519 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg1);
520 Copy = DAG.getCopyToReg(Copy, dl, ArgReg2,
521 OutVals[1], Copy.getValue(1));
522 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
523 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg2)
524 == DAG.getMachineFunction().getRegInfo().liveout_end())
525 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg2);
529 return DAG.getNode(AlphaISD::RET_FLAG, dl,
530 MVT::Other, Copy, Copy.getValue(1));
533 void AlphaTargetLowering::LowerVAARG(SDNode *N, SDValue &Chain,
535 SelectionDAG &DAG) const {
536 Chain = N->getOperand(0);
537 SDValue VAListP = N->getOperand(1);
538 const Value *VAListS = cast<SrcValueSDNode>(N->getOperand(2))->getValue();
539 DebugLoc dl = N->getDebugLoc();
541 SDValue Base = DAG.getLoad(MVT::i64, dl, Chain, VAListP,
542 MachinePointerInfo(VAListS),
544 SDValue Tmp = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
545 DAG.getConstant(8, MVT::i64));
546 SDValue Offset = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Base.getValue(1),
547 Tmp, MachinePointerInfo(),
548 MVT::i32, false, false, 0);
549 DataPtr = DAG.getNode(ISD::ADD, dl, MVT::i64, Base, Offset);
550 if (N->getValueType(0).isFloatingPoint())
552 //if fp && Offset < 6*8, then subtract 6*8 from DataPtr
553 SDValue FPDataPtr = DAG.getNode(ISD::SUB, dl, MVT::i64, DataPtr,
554 DAG.getConstant(8*6, MVT::i64));
555 SDValue CC = DAG.getSetCC(dl, MVT::i64, Offset,
556 DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
557 DataPtr = DAG.getNode(ISD::SELECT, dl, MVT::i64, CC, FPDataPtr, DataPtr);
560 SDValue NewOffset = DAG.getNode(ISD::ADD, dl, MVT::i64, Offset,
561 DAG.getConstant(8, MVT::i64));
562 Chain = DAG.getTruncStore(Offset.getValue(1), dl, NewOffset, Tmp,
563 MachinePointerInfo(),
564 MVT::i32, false, false, 0);
567 /// LowerOperation - Provide custom lowering hooks for some operations.
569 SDValue AlphaTargetLowering::LowerOperation(SDValue Op,
570 SelectionDAG &DAG) const {
571 DebugLoc dl = Op.getDebugLoc();
572 switch (Op.getOpcode()) {
573 default: llvm_unreachable("Wasn't expecting to be able to lower this!");
574 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
576 case ISD::INTRINSIC_WO_CHAIN: {
577 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
579 default: break; // Don't custom lower most intrinsics.
580 case Intrinsic::alpha_umulh:
581 return DAG.getNode(ISD::MULHU, dl, MVT::i64,
582 Op.getOperand(1), Op.getOperand(2));
586 case ISD::SRL_PARTS: {
587 SDValue ShOpLo = Op.getOperand(0);
588 SDValue ShOpHi = Op.getOperand(1);
589 SDValue ShAmt = Op.getOperand(2);
590 SDValue bm = DAG.getNode(ISD::SUB, dl, MVT::i64,
591 DAG.getConstant(64, MVT::i64), ShAmt);
592 SDValue BMCC = DAG.getSetCC(dl, MVT::i64, bm,
593 DAG.getConstant(0, MVT::i64), ISD::SETLE);
594 // if 64 - shAmt <= 0
595 SDValue Hi_Neg = DAG.getConstant(0, MVT::i64);
596 SDValue ShAmt_Neg = DAG.getNode(ISD::SUB, dl, MVT::i64,
597 DAG.getConstant(0, MVT::i64), bm);
598 SDValue Lo_Neg = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt_Neg);
600 SDValue carries = DAG.getNode(ISD::SHL, dl, MVT::i64, ShOpHi, bm);
601 SDValue Hi_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt);
602 SDValue Lo_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpLo, ShAmt);
603 Lo_Pos = DAG.getNode(ISD::OR, dl, MVT::i64, Lo_Pos, carries);
605 SDValue Hi = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Hi_Neg, Hi_Pos);
606 SDValue Lo = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Lo_Neg, Lo_Pos);
607 SDValue Ops[2] = { Lo, Hi };
608 return DAG.getMergeValues(Ops, 2, dl);
610 // case ISD::SRA_PARTS:
612 // case ISD::SHL_PARTS:
615 case ISD::SINT_TO_FP: {
616 assert(Op.getOperand(0).getValueType() == MVT::i64 &&
617 "Unhandled SINT_TO_FP type in custom expander!");
619 bool isDouble = Op.getValueType() == MVT::f64;
620 LD = DAG.getNode(ISD::BITCAST, dl, MVT::f64, Op.getOperand(0));
621 SDValue FP = DAG.getNode(isDouble?AlphaISD::CVTQT_:AlphaISD::CVTQS_, dl,
622 isDouble?MVT::f64:MVT::f32, LD);
625 case ISD::FP_TO_SINT: {
626 bool isDouble = Op.getOperand(0).getValueType() == MVT::f64;
627 SDValue src = Op.getOperand(0);
629 if (!isDouble) //Promote
630 src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, src);
632 src = DAG.getNode(AlphaISD::CVTTQ_, dl, MVT::f64, src);
634 return DAG.getNode(ISD::BITCAST, dl, MVT::i64, src);
636 case ISD::ConstantPool: {
637 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
638 const Constant *C = CP->getConstVal();
639 SDValue CPI = DAG.getTargetConstantPool(C, MVT::i64, CP->getAlignment());
640 // FIXME there isn't really any debug info here
642 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, CPI,
643 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
644 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, CPI, Hi);
647 case ISD::GlobalTLSAddress:
648 llvm_unreachable("TLS not implemented for Alpha.");
649 case ISD::GlobalAddress: {
650 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
651 const GlobalValue *GV = GSDN->getGlobal();
652 SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i64,
654 // FIXME there isn't really any debug info here
656 // if (!GV->hasWeakLinkage() && !GV->isDeclaration()
657 // && !GV->hasLinkOnceLinkage()) {
658 if (GV->hasLocalLinkage()) {
659 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, GA,
660 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
661 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, GA, Hi);
664 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64, GA,
665 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
667 case ISD::ExternalSymbol: {
668 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64,
669 DAG.getTargetExternalSymbol(cast<ExternalSymbolSDNode>(Op)
670 ->getSymbol(), MVT::i64),
671 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
676 //Expand only on constant case
677 if (Op.getOperand(1).getOpcode() == ISD::Constant) {
678 EVT VT = Op.getNode()->getValueType(0);
679 SDValue Tmp1 = Op.getNode()->getOpcode() == ISD::UREM ?
680 BuildUDIV(Op.getNode(), DAG, NULL) :
681 BuildSDIV(Op.getNode(), DAG, NULL);
682 Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Op.getOperand(1));
683 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Op.getOperand(0), Tmp1);
689 if (Op.getValueType().isInteger()) {
690 if (Op.getOperand(1).getOpcode() == ISD::Constant)
691 return Op.getOpcode() == ISD::SDIV ? BuildSDIV(Op.getNode(), DAG, NULL)
692 : BuildUDIV(Op.getNode(), DAG, NULL);
693 const char* opstr = 0;
694 switch (Op.getOpcode()) {
695 case ISD::UREM: opstr = "__remqu"; break;
696 case ISD::SREM: opstr = "__remq"; break;
697 case ISD::UDIV: opstr = "__divqu"; break;
698 case ISD::SDIV: opstr = "__divq"; break;
700 SDValue Tmp1 = Op.getOperand(0),
701 Tmp2 = Op.getOperand(1),
702 Addr = DAG.getExternalSymbol(opstr, MVT::i64);
703 return DAG.getNode(AlphaISD::DivCall, dl, MVT::i64, Addr, Tmp1, Tmp2);
708 SDValue Chain, DataPtr;
709 LowerVAARG(Op.getNode(), Chain, DataPtr, DAG);
712 if (Op.getValueType() == MVT::i32)
713 Result = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Chain, DataPtr,
714 MachinePointerInfo(), MVT::i32, false, false, 0);
716 Result = DAG.getLoad(Op.getValueType(), dl, Chain, DataPtr,
717 MachinePointerInfo(),
722 SDValue Chain = Op.getOperand(0);
723 SDValue DestP = Op.getOperand(1);
724 SDValue SrcP = Op.getOperand(2);
725 const Value *DestS = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
726 const Value *SrcS = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
728 SDValue Val = DAG.getLoad(getPointerTy(), dl, Chain, SrcP,
729 MachinePointerInfo(SrcS),
731 SDValue Result = DAG.getStore(Val.getValue(1), dl, Val, DestP,
732 MachinePointerInfo(DestS),
734 SDValue NP = DAG.getNode(ISD::ADD, dl, MVT::i64, SrcP,
735 DAG.getConstant(8, MVT::i64));
736 Val = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Result,
737 NP, MachinePointerInfo(), MVT::i32, false, false, 0);
738 SDValue NPD = DAG.getNode(ISD::ADD, dl, MVT::i64, DestP,
739 DAG.getConstant(8, MVT::i64));
740 return DAG.getTruncStore(Val.getValue(1), dl, Val, NPD,
741 MachinePointerInfo(), MVT::i32,
745 MachineFunction &MF = DAG.getMachineFunction();
746 AlphaMachineFunctionInfo *FuncInfo = MF.getInfo<AlphaMachineFunctionInfo>();
748 SDValue Chain = Op.getOperand(0);
749 SDValue VAListP = Op.getOperand(1);
750 const Value *VAListS = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
752 // vastart stores the address of the VarArgsBase and VarArgsOffset
753 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsBase(), MVT::i64);
754 SDValue S1 = DAG.getStore(Chain, dl, FR, VAListP,
755 MachinePointerInfo(VAListS), false, false, 0);
756 SDValue SA2 = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
757 DAG.getConstant(8, MVT::i64));
758 return DAG.getTruncStore(S1, dl,
759 DAG.getConstant(FuncInfo->getVarArgsOffset(),
761 SA2, MachinePointerInfo(),
762 MVT::i32, false, false, 0);
764 case ISD::RETURNADDR:
765 return DAG.getNode(AlphaISD::GlobalRetAddr, DebugLoc(), MVT::i64);
767 case ISD::FRAMEADDR: break;
773 void AlphaTargetLowering::ReplaceNodeResults(SDNode *N,
774 SmallVectorImpl<SDValue>&Results,
775 SelectionDAG &DAG) const {
776 DebugLoc dl = N->getDebugLoc();
777 assert(N->getValueType(0) == MVT::i32 &&
778 N->getOpcode() == ISD::VAARG &&
779 "Unknown node to custom promote!");
781 SDValue Chain, DataPtr;
782 LowerVAARG(N, Chain, DataPtr, DAG);
783 SDValue Res = DAG.getLoad(N->getValueType(0), dl, Chain, DataPtr,
784 MachinePointerInfo(),
786 Results.push_back(Res);
787 Results.push_back(SDValue(Res.getNode(), 1));
793 /// getConstraintType - Given a constraint letter, return the type of
794 /// constraint it is for this target.
795 AlphaTargetLowering::ConstraintType
796 AlphaTargetLowering::getConstraintType(const std::string &Constraint) const {
797 if (Constraint.size() == 1) {
798 switch (Constraint[0]) {
802 return C_RegisterClass;
805 return TargetLowering::getConstraintType(Constraint);
808 /// Examine constraint type and operand type and determine a weight value.
809 /// This object must already have been set up with the operand type
810 /// and the current alternative constraint selected.
811 TargetLowering::ConstraintWeight
812 AlphaTargetLowering::getSingleConstraintMatchWeight(
813 AsmOperandInfo &info, const char *constraint) const {
814 ConstraintWeight weight = CW_Invalid;
815 Value *CallOperandVal = info.CallOperandVal;
816 // If we don't have a value, we can't do a match,
817 // but allow it at the lowest weight.
818 if (CallOperandVal == NULL)
820 // Look at the constraint type.
821 switch (*constraint) {
823 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
826 weight = CW_Register;
832 /// Given a register class constraint, like 'r', if this corresponds directly
833 /// to an LLVM register class, return a register of 0 and the register class
835 std::pair<unsigned, const TargetRegisterClass*> AlphaTargetLowering::
836 getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const
838 if (Constraint.size() == 1) {
839 switch (Constraint[0]) {
841 return std::make_pair(0U, Alpha::GPRCRegisterClass);
843 return VT == MVT::f64 ? std::make_pair(0U, Alpha::F8RCRegisterClass) :
844 std::make_pair(0U, Alpha::F4RCRegisterClass);
847 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
850 //===----------------------------------------------------------------------===//
851 // Other Lowering Code
852 //===----------------------------------------------------------------------===//
855 AlphaTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
856 MachineBasicBlock *BB) const {
857 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
858 assert((MI->getOpcode() == Alpha::CAS32 ||
859 MI->getOpcode() == Alpha::CAS64 ||
860 MI->getOpcode() == Alpha::LAS32 ||
861 MI->getOpcode() == Alpha::LAS64 ||
862 MI->getOpcode() == Alpha::SWAP32 ||
863 MI->getOpcode() == Alpha::SWAP64) &&
864 "Unexpected instr type to insert");
866 bool is32 = MI->getOpcode() == Alpha::CAS32 ||
867 MI->getOpcode() == Alpha::LAS32 ||
868 MI->getOpcode() == Alpha::SWAP32;
870 //Load locked store conditional for atomic ops take on the same form
873 //do stuff (maybe branch to exit)
875 //test sc and maybe branck to start
877 const BasicBlock *LLVM_BB = BB->getBasicBlock();
878 DebugLoc dl = MI->getDebugLoc();
879 MachineFunction::iterator It = BB;
882 MachineBasicBlock *thisMBB = BB;
883 MachineFunction *F = BB->getParent();
884 MachineBasicBlock *llscMBB = F->CreateMachineBasicBlock(LLVM_BB);
885 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
887 sinkMBB->splice(sinkMBB->begin(), thisMBB,
888 llvm::next(MachineBasicBlock::iterator(MI)),
890 sinkMBB->transferSuccessorsAndUpdatePHIs(thisMBB);
892 F->insert(It, llscMBB);
893 F->insert(It, sinkMBB);
895 BuildMI(thisMBB, dl, TII->get(Alpha::BR)).addMBB(llscMBB);
897 unsigned reg_res = MI->getOperand(0).getReg(),
898 reg_ptr = MI->getOperand(1).getReg(),
899 reg_v2 = MI->getOperand(2).getReg(),
900 reg_store = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
902 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::LDL_L : Alpha::LDQ_L),
903 reg_res).addImm(0).addReg(reg_ptr);
904 switch (MI->getOpcode()) {
908 = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
909 BuildMI(llscMBB, dl, TII->get(Alpha::CMPEQ), reg_cmp)
910 .addReg(reg_v2).addReg(reg_res);
911 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
912 .addImm(0).addReg(reg_cmp).addMBB(sinkMBB);
913 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
914 .addReg(Alpha::R31).addReg(MI->getOperand(3).getReg());
919 BuildMI(llscMBB, dl,TII->get(is32 ? Alpha::ADDLr : Alpha::ADDQr), reg_store)
920 .addReg(reg_res).addReg(reg_v2);
924 case Alpha::SWAP64: {
925 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
926 .addReg(reg_v2).addReg(reg_v2);
930 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::STL_C : Alpha::STQ_C), reg_store)
931 .addReg(reg_store).addImm(0).addReg(reg_ptr);
932 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
933 .addImm(0).addReg(reg_store).addMBB(llscMBB);
934 BuildMI(llscMBB, dl, TII->get(Alpha::BR)).addMBB(sinkMBB);
936 thisMBB->addSuccessor(llscMBB);
937 llscMBB->addSuccessor(llscMBB);
938 llscMBB->addSuccessor(sinkMBB);
939 MI->eraseFromParent(); // The pseudo instruction is gone now.
945 AlphaTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
946 // The Alpha target isn't yet aware of offsets.
950 bool AlphaTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
951 if (VT != MVT::f32 && VT != MVT::f64)
957 return Imm.isZero() || Imm.isNegZero();