1 //===-- AlphaISelLowering.cpp - Alpha DAG Lowering Implementation ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Andrew Lenharth and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the AlphaISelLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "AlphaISelLowering.h"
15 #include "AlphaTargetMachine.h"
16 #include "llvm/CodeGen/MachineFrameInfo.h"
17 #include "llvm/CodeGen/MachineFunction.h"
18 #include "llvm/CodeGen/MachineInstrBuilder.h"
19 #include "llvm/CodeGen/SelectionDAG.h"
20 #include "llvm/CodeGen/SSARegMap.h"
21 #include "llvm/Constants.h"
22 #include "llvm/Function.h"
23 #include "llvm/Support/CommandLine.h"
29 extern cl::opt<bool> EnableAlphaIDIV;
30 extern cl::opt<bool> EnableAlphaCount;
31 extern cl::opt<bool> EnableAlphaLSMark;
34 /// AddLiveIn - This helper function adds the specified physical register to the
35 /// MachineFunction as a live in value. It also creates a corresponding virtual
37 static unsigned AddLiveIn(MachineFunction &MF, unsigned PReg,
38 TargetRegisterClass *RC) {
39 assert(RC->contains(PReg) && "Not the correct regclass!");
40 unsigned VReg = MF.getSSARegMap()->createVirtualRegister(RC);
41 MF.addLiveIn(PReg, VReg);
45 AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM) : TargetLowering(TM) {
46 // Set up the TargetLowering object.
47 //I am having problems with shr n ubyte 1
48 setShiftAmountType(MVT::i64);
49 setSetCCResultType(MVT::i64);
50 setSetCCResultContents(ZeroOrOneSetCCResult);
52 addRegisterClass(MVT::i64, Alpha::GPRCRegisterClass);
53 addRegisterClass(MVT::f64, Alpha::FPRCRegisterClass);
54 addRegisterClass(MVT::f32, Alpha::FPRCRegisterClass);
56 setOperationAction(ISD::BRCONDTWOWAY, MVT::Other, Expand);
57 setOperationAction(ISD::BRTWOWAY_CC, MVT::Other, Expand);
59 setOperationAction(ISD::EXTLOAD, MVT::i1, Promote);
60 setOperationAction(ISD::EXTLOAD, MVT::f32, Expand);
62 setOperationAction(ISD::ZEXTLOAD, MVT::i1, Promote);
63 setOperationAction(ISD::ZEXTLOAD, MVT::i32, Expand);
65 setOperationAction(ISD::SEXTLOAD, MVT::i1, Promote);
66 setOperationAction(ISD::SEXTLOAD, MVT::i8, Expand);
67 setOperationAction(ISD::SEXTLOAD, MVT::i16, Expand);
69 setOperationAction(ISD::TRUNCSTORE, MVT::i1, Promote);
71 setOperationAction(ISD::FREM, MVT::f32, Expand);
72 setOperationAction(ISD::FREM, MVT::f64, Expand);
74 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
76 if (!TM.getSubtarget<AlphaSubtarget>().hasCT()) {
77 setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
78 setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
79 setOperationAction(ISD::CTLZ , MVT::i64 , Expand);
82 //If this didn't legalize into a div....
83 // setOperationAction(ISD::SREM , MVT::i64, Expand);
84 // setOperationAction(ISD::UREM , MVT::i64, Expand);
86 setOperationAction(ISD::MEMMOVE , MVT::Other, Expand);
87 setOperationAction(ISD::MEMSET , MVT::Other, Expand);
88 setOperationAction(ISD::MEMCPY , MVT::Other, Expand);
90 // We don't support sin/cos/sqrt
91 setOperationAction(ISD::FSIN , MVT::f64, Expand);
92 setOperationAction(ISD::FCOS , MVT::f64, Expand);
93 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
94 setOperationAction(ISD::FSIN , MVT::f32, Expand);
95 setOperationAction(ISD::FCOS , MVT::f32, Expand);
96 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
99 setOperationAction(ISD::SETCC, MVT::f32, Promote);
101 computeRegisterProperties();
103 addLegalFPImmediate(+0.0); //F31
104 addLegalFPImmediate(-0.0); //-F31
108 //http://www.cs.arizona.edu/computer.help/policy/DIGITAL_unix/AA-PY8AC-TET1_html/callCH3.html#BLOCK21
110 //For now, just use variable size stack frame format
112 //In a standard call, the first six items are passed in registers $16
113 //- $21 and/or registers $f16 - $f21. (See Section 4.1.2 for details
114 //of argument-to-register correspondence.) The remaining items are
115 //collected in a memory argument list that is a naturally aligned
116 //array of quadwords. In a standard call, this list, if present, must
117 //be passed at 0(SP).
118 //7 ... n 0(SP) ... (n-7)*8(SP)
126 std::vector<SDOperand>
127 AlphaTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG)
129 MachineFunction &MF = DAG.getMachineFunction();
130 MachineFrameInfo *MFI = MF.getFrameInfo();
131 MachineBasicBlock& BB = MF.front();
132 std::vector<SDOperand> ArgValues;
134 unsigned args_int[] = {
135 Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21};
136 unsigned args_float[] = {
137 Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21};
141 GP = AddLiveIn(MF, Alpha::R29, getRegClassFor(MVT::i64));
142 RA = AddLiveIn(MF, Alpha::R26, getRegClassFor(MVT::i64));
144 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I)
149 MVT::ValueType VT = getValueType(I->getType());
152 std::cerr << "Unknown Type " << VT << "\n";
156 args_float[count] = AddLiveIn(MF, args_float[count], getRegClassFor(VT));
157 argt = DAG.getCopyFromReg(DAG.getRoot(), args_float[count], VT);
158 DAG.setRoot(argt.getValue(1));
165 args_int[count] = AddLiveIn(MF, args_int[count], getRegClassFor(MVT::i64));
166 argt = DAG.getCopyFromReg(DAG.getRoot(), args_int[count], MVT::i64);
167 DAG.setRoot(argt.getValue(1));
168 if (VT != MVT::i64) {
170 I->getType()->isSigned() ? ISD::AssertSext : ISD::AssertZext;
171 argt = DAG.getNode(AssertOp, MVT::i64, argt,
172 DAG.getValueType(VT));
173 argt = DAG.getNode(ISD::TRUNCATE, VT, argt);
178 // Create the frame index object for this incoming parameter...
179 int FI = MFI->CreateFixedObject(8, 8 * (count - 6));
181 // Create the SelectionDAG nodes corresponding to a load
182 //from this parameter
183 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i64);
184 argt = DAG.getLoad(getValueType(I->getType()),
185 DAG.getEntryNode(), FIN, DAG.getSrcValue(NULL));
188 ArgValues.push_back(argt);
191 // If the functions takes variable number of arguments, copy all regs to stack
193 VarArgsOffset = count * 8;
194 std::vector<SDOperand> LS;
195 for (int i = 0; i < 6; ++i) {
196 if (MRegisterInfo::isPhysicalRegister(args_int[i]))
197 args_int[i] = AddLiveIn(MF, args_int[i], getRegClassFor(MVT::i64));
198 SDOperand argt = DAG.getCopyFromReg(DAG.getRoot(), args_int[i], MVT::i64);
199 int FI = MFI->CreateFixedObject(8, -8 * (6 - i));
200 if (i == 0) VarArgsBase = FI;
201 SDOperand SDFI = DAG.getFrameIndex(FI, MVT::i64);
202 LS.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(), argt,
203 SDFI, DAG.getSrcValue(NULL)));
205 if (MRegisterInfo::isPhysicalRegister(args_float[i]))
206 args_float[i] = AddLiveIn(MF, args_float[i], getRegClassFor(MVT::f64));
207 argt = DAG.getCopyFromReg(DAG.getRoot(), args_float[i], MVT::f64);
208 FI = MFI->CreateFixedObject(8, - 8 * (12 - i));
209 SDFI = DAG.getFrameIndex(FI, MVT::i64);
210 LS.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(), argt,
211 SDFI, DAG.getSrcValue(NULL)));
214 //Set up a token factor with all the stack traffic
215 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, LS));
218 // Finally, inform the code generator which regs we return values in.
219 switch (getValueType(F.getReturnType())) {
220 default: assert(0 && "Unknown type!");
221 case MVT::isVoid: break;
227 MF.addLiveOut(Alpha::R0);
231 MF.addLiveOut(Alpha::F0);
235 //return the arguments
239 std::pair<SDOperand, SDOperand>
240 AlphaTargetLowering::LowerCallTo(SDOperand Chain,
241 const Type *RetTy, bool isVarArg,
242 unsigned CallingConv, bool isTailCall,
243 SDOperand Callee, ArgListTy &Args,
247 NumBytes = (Args.size() - 6) * 8;
249 Chain = DAG.getNode(ISD::CALLSEQ_START, MVT::Other, Chain,
250 DAG.getConstant(NumBytes, getPointerTy()));
251 std::vector<SDOperand> args_to_use;
252 for (unsigned i = 0, e = Args.size(); i != e; ++i)
254 switch (getValueType(Args[i].second)) {
255 default: assert(0 && "Unexpected ValueType for argument!");
260 // Promote the integer to 64 bits. If the input type is signed use a
261 // sign extend, otherwise use a zero extend.
262 if (Args[i].second->isSigned())
263 Args[i].first = DAG.getNode(ISD::SIGN_EXTEND, MVT::i64, Args[i].first);
265 Args[i].first = DAG.getNode(ISD::ZERO_EXTEND, MVT::i64, Args[i].first);
272 args_to_use.push_back(Args[i].first);
275 std::vector<MVT::ValueType> RetVals;
276 MVT::ValueType RetTyVT = getValueType(RetTy);
277 MVT::ValueType ActualRetTyVT = RetTyVT;
278 if (RetTyVT >= MVT::i1 && RetTyVT <= MVT::i32)
279 ActualRetTyVT = MVT::i64;
281 if (RetTyVT != MVT::isVoid)
282 RetVals.push_back(ActualRetTyVT);
283 RetVals.push_back(MVT::Other);
285 SDOperand TheCall = SDOperand(DAG.getCall(RetVals,
286 Chain, Callee, args_to_use), 0);
287 Chain = TheCall.getValue(RetTyVT != MVT::isVoid);
288 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
289 DAG.getConstant(NumBytes, getPointerTy()));
290 SDOperand RetVal = TheCall;
292 if (RetTyVT != ActualRetTyVT) {
293 RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext : ISD::AssertZext,
294 MVT::i64, RetVal, DAG.getValueType(RetTyVT));
295 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
298 return std::make_pair(RetVal, Chain);
301 SDOperand AlphaTargetLowering::LowerVAStart(SDOperand Chain, SDOperand VAListP,
302 Value *VAListV, SelectionDAG &DAG) {
303 // vastart stores the address of the VarArgsBase and VarArgsOffset
304 SDOperand FR = DAG.getFrameIndex(VarArgsBase, MVT::i64);
305 SDOperand S1 = DAG.getNode(ISD::STORE, MVT::Other, Chain, FR, VAListP,
306 DAG.getSrcValue(VAListV));
307 SDOperand SA2 = DAG.getNode(ISD::ADD, MVT::i64, VAListP,
308 DAG.getConstant(8, MVT::i64));
309 return DAG.getNode(ISD::TRUNCSTORE, MVT::Other, S1,
310 DAG.getConstant(VarArgsOffset, MVT::i64), SA2,
311 DAG.getSrcValue(VAListV, 8), DAG.getValueType(MVT::i32));
314 std::pair<SDOperand,SDOperand> AlphaTargetLowering::
315 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
316 const Type *ArgTy, SelectionDAG &DAG) {
317 SDOperand Base = DAG.getLoad(MVT::i64, Chain, VAListP,
318 DAG.getSrcValue(VAListV));
319 SDOperand Tmp = DAG.getNode(ISD::ADD, MVT::i64, VAListP,
320 DAG.getConstant(8, MVT::i64));
321 SDOperand Offset = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Base.getValue(1),
322 Tmp, DAG.getSrcValue(VAListV, 8), MVT::i32);
323 SDOperand DataPtr = DAG.getNode(ISD::ADD, MVT::i64, Base, Offset);
324 if (ArgTy->isFloatingPoint())
326 //if fp && Offset < 6*8, then subtract 6*8 from DataPtr
327 SDOperand FPDataPtr = DAG.getNode(ISD::SUB, MVT::i64, DataPtr,
328 DAG.getConstant(8*6, MVT::i64));
329 SDOperand CC = DAG.getSetCC(MVT::i64, Offset,
330 DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
331 DataPtr = DAG.getNode(ISD::SELECT, MVT::i64, CC, FPDataPtr, DataPtr);
335 if (ArgTy == Type::IntTy)
336 Result = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Offset.getValue(1),
337 DataPtr, DAG.getSrcValue(NULL), MVT::i32);
338 else if (ArgTy == Type::UIntTy)
339 Result = DAG.getExtLoad(ISD::ZEXTLOAD, MVT::i64, Offset.getValue(1),
340 DataPtr, DAG.getSrcValue(NULL), MVT::i32);
342 Result = DAG.getLoad(getValueType(ArgTy), Offset.getValue(1), DataPtr,
343 DAG.getSrcValue(NULL));
345 SDOperand NewOffset = DAG.getNode(ISD::ADD, MVT::i64, Offset,
346 DAG.getConstant(8, MVT::i64));
347 SDOperand Update = DAG.getNode(ISD::TRUNCSTORE, MVT::Other,
348 Result.getValue(1), NewOffset,
349 Tmp, DAG.getSrcValue(VAListV, 8),
350 DAG.getValueType(MVT::i32));
351 Result = DAG.getNode(ISD::TRUNCATE, getValueType(ArgTy), Result);
353 return std::make_pair(Result, Update);
357 SDOperand AlphaTargetLowering::
358 LowerVACopy(SDOperand Chain, SDOperand SrcP, Value *SrcV, SDOperand DestP,
359 Value *DestV, SelectionDAG &DAG) {
360 SDOperand Val = DAG.getLoad(getPointerTy(), Chain, SrcP,
361 DAG.getSrcValue(SrcV));
362 SDOperand Result = DAG.getNode(ISD::STORE, MVT::Other, Val.getValue(1),
363 Val, DestP, DAG.getSrcValue(DestV));
364 SDOperand NP = DAG.getNode(ISD::ADD, MVT::i64, SrcP,
365 DAG.getConstant(8, MVT::i64));
366 Val = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Result, NP,
367 DAG.getSrcValue(SrcV, 8), MVT::i32);
368 SDOperand NPD = DAG.getNode(ISD::ADD, MVT::i64, DestP,
369 DAG.getConstant(8, MVT::i64));
370 return DAG.getNode(ISD::TRUNCSTORE, MVT::Other, Val.getValue(1),
371 Val, NPD, DAG.getSrcValue(DestV, 8),
372 DAG.getValueType(MVT::i32));
375 void AlphaTargetLowering::restoreGP(MachineBasicBlock* BB)
377 BuildMI(BB, Alpha::BIS, 2, Alpha::R29).addReg(GP).addReg(GP);
379 void AlphaTargetLowering::restoreRA(MachineBasicBlock* BB)
381 BuildMI(BB, Alpha::BIS, 2, Alpha::R26).addReg(RA).addReg(RA);