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> EnableAlphaFTOI;
31 extern cl::opt<bool> EnableAlphaCT;
32 extern cl::opt<bool> EnableAlphaCount;
33 extern cl::opt<bool> EnableAlphaLSMark;
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.getSSARegMap()->createVirtualRegister(RC);
43 MF.addLiveIn(PReg, VReg);
47 AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM) : TargetLowering(TM) {
48 // Set up the TargetLowering object.
49 //I am having problems with shr n ubyte 1
50 setShiftAmountType(MVT::i64);
51 setSetCCResultType(MVT::i64);
52 setSetCCResultContents(ZeroOrOneSetCCResult);
54 addRegisterClass(MVT::i64, Alpha::GPRCRegisterClass);
55 addRegisterClass(MVT::f64, Alpha::FPRCRegisterClass);
56 addRegisterClass(MVT::f32, Alpha::FPRCRegisterClass);
58 setOperationAction(ISD::BRCONDTWOWAY, MVT::Other, Expand);
59 setOperationAction(ISD::BRTWOWAY_CC, MVT::Other, Expand);
61 setOperationAction(ISD::EXTLOAD, MVT::i1, Promote);
62 setOperationAction(ISD::EXTLOAD, MVT::f32, Expand);
64 setOperationAction(ISD::ZEXTLOAD, MVT::i1, Promote);
65 setOperationAction(ISD::ZEXTLOAD, MVT::i32, Expand);
67 setOperationAction(ISD::SEXTLOAD, MVT::i1, Promote);
68 setOperationAction(ISD::SEXTLOAD, MVT::i8, Expand);
69 setOperationAction(ISD::SEXTLOAD, MVT::i16, Expand);
71 setOperationAction(ISD::SREM, MVT::f32, Expand);
72 setOperationAction(ISD::SREM, MVT::f64, Expand);
74 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
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};
138 unsigned added_int = 0;
139 unsigned added_fp = 0;
143 GP = AddLiveIn(MF, Alpha::R29, getRegClassFor(MVT::i64));
144 RA = AddLiveIn(MF, Alpha::R26, getRegClassFor(MVT::i64));
146 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I)
151 MVT::ValueType VT = getValueType(I->getType());
154 std::cerr << "Unknown Type " << VT << "\n";
158 args_float[count] = AddLiveIn(MF, args_float[count], getRegClassFor(VT));
159 added_fp |= (1 << count);
160 argt = DAG.getCopyFromReg(DAG.getRoot(), args_float[count], VT);
161 DAG.setRoot(argt.getValue(1));
168 args_int[count] = AddLiveIn(MF, args_int[count], getRegClassFor(MVT::i64));
169 added_int |= (1 << count);
170 argt = DAG.getCopyFromReg(DAG.getRoot(), args_int[count], MVT::i64);
171 DAG.setRoot(argt.getValue(1));
172 if (VT != MVT::i64) {
174 I->getType()->isSigned() ? ISD::AssertSext : ISD::AssertZext;
175 argt = DAG.getNode(AssertOp, MVT::i64, argt,
176 DAG.getValueType(VT));
177 argt = DAG.getNode(ISD::TRUNCATE, VT, argt);
182 // Create the frame index object for this incoming parameter...
183 int FI = MFI->CreateFixedObject(8, 8 * (count - 6));
185 // Create the SelectionDAG nodes corresponding to a load
186 //from this parameter
187 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i64);
188 argt = DAG.getLoad(getValueType(I->getType()),
189 DAG.getEntryNode(), FIN, DAG.getSrcValue(NULL));
192 ArgValues.push_back(argt);
195 // If the functions takes variable number of arguments, copy all regs to stack
197 VarArgsOffset = count * 8;
198 std::vector<SDOperand> LS;
199 for (int i = 0; i < 6; ++i) {
200 if (!(added_int & (1 << i)))
201 args_int[i] = AddLiveIn(MF, args_int[i], getRegClassFor(MVT::i64));
202 SDOperand argt = DAG.getCopyFromReg(DAG.getRoot(), args_int[i], MVT::i64);
203 int FI = MFI->CreateFixedObject(8, -8 * (6 - i));
204 if (i == 0) VarArgsBase = FI;
205 SDOperand SDFI = DAG.getFrameIndex(FI, MVT::i64);
206 LS.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(), argt,
207 SDFI, DAG.getSrcValue(NULL)));
209 if (!(added_fp & (1 << i)))
210 args_float[i] = AddLiveIn(MF, args_float[i], getRegClassFor(MVT::f64));
211 argt = DAG.getCopyFromReg(DAG.getRoot(), args_float[i], MVT::f64);
212 FI = MFI->CreateFixedObject(8, - 8 * (12 - i));
213 SDFI = DAG.getFrameIndex(FI, MVT::i64);
214 LS.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(), argt,
215 SDFI, DAG.getSrcValue(NULL)));
218 //Set up a token factor with all the stack traffic
219 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, LS));
222 // Finally, inform the code generator which regs we return values in.
223 switch (getValueType(F.getReturnType())) {
224 default: assert(0 && "Unknown type!");
225 case MVT::isVoid: break;
231 MF.addLiveOut(Alpha::R0);
235 MF.addLiveOut(Alpha::F0);
239 //return the arguments
243 std::pair<SDOperand, SDOperand>
244 AlphaTargetLowering::LowerCallTo(SDOperand Chain,
245 const Type *RetTy, bool isVarArg,
246 unsigned CallingConv, bool isTailCall,
247 SDOperand Callee, ArgListTy &Args,
251 NumBytes = (Args.size() - 6) * 8;
253 Chain = DAG.getNode(ISD::CALLSEQ_START, MVT::Other, Chain,
254 DAG.getConstant(NumBytes, getPointerTy()));
255 std::vector<SDOperand> args_to_use;
256 for (unsigned i = 0, e = Args.size(); i != e; ++i)
258 switch (getValueType(Args[i].second)) {
259 default: assert(0 && "Unexpected ValueType for argument!");
264 // Promote the integer to 64 bits. If the input type is signed use a
265 // sign extend, otherwise use a zero extend.
266 if (Args[i].second->isSigned())
267 Args[i].first = DAG.getNode(ISD::SIGN_EXTEND, MVT::i64, Args[i].first);
269 Args[i].first = DAG.getNode(ISD::ZERO_EXTEND, MVT::i64, Args[i].first);
276 args_to_use.push_back(Args[i].first);
279 std::vector<MVT::ValueType> RetVals;
280 MVT::ValueType RetTyVT = getValueType(RetTy);
281 if (RetTyVT != MVT::isVoid)
282 RetVals.push_back(RetTyVT);
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 return std::make_pair(TheCall, Chain);
293 SDOperand AlphaTargetLowering::LowerVAStart(SDOperand Chain, SDOperand VAListP,
294 Value *VAListV, SelectionDAG &DAG) {
295 // vastart stores the address of the VarArgsBase and VarArgsOffset
296 SDOperand FR = DAG.getFrameIndex(VarArgsBase, MVT::i64);
297 SDOperand S1 = DAG.getNode(ISD::STORE, MVT::Other, Chain, FR, VAListP,
298 DAG.getSrcValue(VAListV));
299 SDOperand SA2 = DAG.getNode(ISD::ADD, MVT::i64, VAListP,
300 DAG.getConstant(8, MVT::i64));
301 return DAG.getNode(ISD::TRUNCSTORE, MVT::Other, S1,
302 DAG.getConstant(VarArgsOffset, MVT::i64), SA2,
303 DAG.getSrcValue(VAListV, 8), DAG.getValueType(MVT::i32));
306 std::pair<SDOperand,SDOperand> AlphaTargetLowering::
307 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
308 const Type *ArgTy, SelectionDAG &DAG) {
309 SDOperand Base = DAG.getLoad(MVT::i64, Chain, VAListP,
310 DAG.getSrcValue(VAListV));
311 SDOperand Tmp = DAG.getNode(ISD::ADD, MVT::i64, VAListP,
312 DAG.getConstant(8, MVT::i64));
313 SDOperand Offset = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Base.getValue(1),
314 Tmp, DAG.getSrcValue(VAListV, 8), MVT::i32);
315 SDOperand DataPtr = DAG.getNode(ISD::ADD, MVT::i64, Base, Offset);
316 if (ArgTy->isFloatingPoint())
318 //if fp && Offset < 6*8, then subtract 6*8 from DataPtr
319 SDOperand FPDataPtr = DAG.getNode(ISD::SUB, MVT::i64, DataPtr,
320 DAG.getConstant(8*6, MVT::i64));
321 SDOperand CC = DAG.getSetCC(MVT::i64, Offset,
322 DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
323 DataPtr = DAG.getNode(ISD::SELECT, MVT::i64, CC, FPDataPtr, DataPtr);
327 if (ArgTy == Type::IntTy)
328 Result = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Offset.getValue(1),
329 DataPtr, DAG.getSrcValue(NULL), MVT::i32);
330 else if (ArgTy == Type::UIntTy)
331 Result = DAG.getExtLoad(ISD::ZEXTLOAD, MVT::i64, Offset.getValue(1),
332 DataPtr, DAG.getSrcValue(NULL), MVT::i32);
334 Result = DAG.getLoad(getValueType(ArgTy), Offset.getValue(1), DataPtr,
335 DAG.getSrcValue(NULL));
337 SDOperand NewOffset = DAG.getNode(ISD::ADD, MVT::i64, Offset,
338 DAG.getConstant(8, MVT::i64));
339 SDOperand Update = DAG.getNode(ISD::TRUNCSTORE, MVT::Other,
340 Result.getValue(1), NewOffset,
341 Tmp, DAG.getSrcValue(VAListV, 8),
342 DAG.getValueType(MVT::i32));
343 Result = DAG.getNode(ISD::TRUNCATE, getValueType(ArgTy), Result);
345 return std::make_pair(Result, Update);
349 SDOperand AlphaTargetLowering::
350 LowerVACopy(SDOperand Chain, SDOperand SrcP, Value *SrcV, SDOperand DestP,
351 Value *DestV, SelectionDAG &DAG) {
352 SDOperand Val = DAG.getLoad(getPointerTy(), Chain, SrcP,
353 DAG.getSrcValue(SrcV));
354 SDOperand Result = DAG.getNode(ISD::STORE, MVT::Other, Val.getValue(1),
355 Val, DestP, DAG.getSrcValue(DestV));
356 SDOperand NP = DAG.getNode(ISD::ADD, MVT::i64, SrcP,
357 DAG.getConstant(8, MVT::i64));
358 Val = DAG.getExtLoad(ISD::SEXTLOAD, MVT::i64, Result, NP,
359 DAG.getSrcValue(SrcV, 8), MVT::i32);
360 SDOperand NPD = DAG.getNode(ISD::ADD, MVT::i64, DestP,
361 DAG.getConstant(8, MVT::i64));
362 return DAG.getNode(ISD::TRUNCSTORE, MVT::Other, Val.getValue(1),
363 Val, NPD, DAG.getSrcValue(DestV, 8),
364 DAG.getValueType(MVT::i32));
367 void AlphaTargetLowering::restoreGP(MachineBasicBlock* BB)
369 BuildMI(BB, Alpha::BIS, 2, Alpha::R29).addReg(GP).addReg(GP);
371 void AlphaTargetLowering::restoreRA(MachineBasicBlock* BB)
373 BuildMI(BB, Alpha::BIS, 2, Alpha::R26).addReg(RA).addReg(RA);