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 "llvm/CodeGen/CallingConvLower.h"
17 #include "llvm/CodeGen/MachineFrameInfo.h"
18 #include "llvm/CodeGen/MachineFunction.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/CodeGen/MachineRegisterInfo.h"
21 #include "llvm/CodeGen/SelectionDAG.h"
22 #include "llvm/CodeGen/MachineRegisterInfo.h"
23 #include "llvm/CodeGen/PseudoSourceValue.h"
24 #include "llvm/Target/TargetLoweringObjectFile.h"
25 #include "llvm/Constants.h"
26 #include "llvm/Function.h"
27 #include "llvm/Module.h"
28 #include "llvm/Intrinsics.h"
29 #include "llvm/Support/CommandLine.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/raw_ostream.h"
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.getRegInfo().createVirtualRegister(RC);
41 MF.getRegInfo().addLiveIn(PReg, VReg);
45 AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM)
46 : TargetLowering(TM, new TargetLoweringObjectFileELF()) {
47 // Set up the TargetLowering object.
48 //I am having problems with shr n i8 1
49 setShiftAmountType(MVT::i64);
50 setBooleanContents(ZeroOrOneBooleanContent);
52 setUsesGlobalOffsetTable(true);
54 addRegisterClass(MVT::i64, Alpha::GPRCRegisterClass);
55 addRegisterClass(MVT::f64, Alpha::F8RCRegisterClass);
56 addRegisterClass(MVT::f32, Alpha::F4RCRegisterClass);
58 // We want to custom lower some of our intrinsics.
59 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
61 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
62 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
64 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
65 setLoadExtAction(ISD::ZEXTLOAD, MVT::i32, Expand);
67 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
68 setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
69 setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand);
71 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
73 // setOperationAction(ISD::BRIND, MVT::Other, Expand);
74 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
75 setOperationAction(ISD::BR_CC, MVT::Other, Expand);
76 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
78 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
80 setOperationAction(ISD::FREM, MVT::f32, Expand);
81 setOperationAction(ISD::FREM, MVT::f64, Expand);
83 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
84 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
85 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
86 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
88 if (!TM.getSubtarget<AlphaSubtarget>().hasCT()) {
89 setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
90 setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
91 setOperationAction(ISD::CTLZ , MVT::i64 , Expand);
93 setOperationAction(ISD::BSWAP , MVT::i64, Expand);
94 setOperationAction(ISD::ROTL , MVT::i64, Expand);
95 setOperationAction(ISD::ROTR , MVT::i64, Expand);
97 setOperationAction(ISD::SREM , MVT::i64, Custom);
98 setOperationAction(ISD::UREM , MVT::i64, Custom);
99 setOperationAction(ISD::SDIV , MVT::i64, Custom);
100 setOperationAction(ISD::UDIV , MVT::i64, Custom);
102 setOperationAction(ISD::ADDC , MVT::i64, Expand);
103 setOperationAction(ISD::ADDE , MVT::i64, Expand);
104 setOperationAction(ISD::SUBC , MVT::i64, Expand);
105 setOperationAction(ISD::SUBE , MVT::i64, Expand);
107 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
108 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
110 setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
111 setOperationAction(ISD::SRA_PARTS, MVT::i64, Expand);
112 setOperationAction(ISD::SHL_PARTS, MVT::i64, Expand);
114 // We don't support sin/cos/sqrt/pow
115 setOperationAction(ISD::FSIN , MVT::f64, Expand);
116 setOperationAction(ISD::FCOS , MVT::f64, Expand);
117 setOperationAction(ISD::FSIN , MVT::f32, Expand);
118 setOperationAction(ISD::FCOS , MVT::f32, Expand);
120 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
121 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
123 setOperationAction(ISD::FPOW , MVT::f32, Expand);
124 setOperationAction(ISD::FPOW , MVT::f64, Expand);
126 setOperationAction(ISD::SETCC, MVT::f32, Promote);
128 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Promote);
130 // We don't have line number support yet.
131 setOperationAction(ISD::DBG_STOPPOINT, MVT::Other, Expand);
132 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
133 setOperationAction(ISD::DBG_LABEL, MVT::Other, Expand);
134 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
136 // Not implemented yet.
137 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
138 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
139 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
141 // We want to legalize GlobalAddress and ConstantPool and
142 // ExternalSymbols nodes into the appropriate instructions to
143 // materialize the address.
144 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
145 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
146 setOperationAction(ISD::ExternalSymbol, MVT::i64, Custom);
147 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
149 setOperationAction(ISD::VASTART, MVT::Other, Custom);
150 setOperationAction(ISD::VAEND, MVT::Other, Expand);
151 setOperationAction(ISD::VACOPY, MVT::Other, Custom);
152 setOperationAction(ISD::VAARG, MVT::Other, Custom);
153 setOperationAction(ISD::VAARG, MVT::i32, Custom);
155 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
156 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
158 setStackPointerRegisterToSaveRestore(Alpha::R30);
161 setJumpBufAlignment(16);
163 computeRegisterProperties();
166 MVT::SimpleValueType AlphaTargetLowering::getSetCCResultType(EVT VT) const {
170 const char *AlphaTargetLowering::getTargetNodeName(unsigned Opcode) const {
173 case AlphaISD::CVTQT_: return "Alpha::CVTQT_";
174 case AlphaISD::CVTQS_: return "Alpha::CVTQS_";
175 case AlphaISD::CVTTQ_: return "Alpha::CVTTQ_";
176 case AlphaISD::GPRelHi: return "Alpha::GPRelHi";
177 case AlphaISD::GPRelLo: return "Alpha::GPRelLo";
178 case AlphaISD::RelLit: return "Alpha::RelLit";
179 case AlphaISD::GlobalRetAddr: return "Alpha::GlobalRetAddr";
180 case AlphaISD::CALL: return "Alpha::CALL";
181 case AlphaISD::DivCall: return "Alpha::DivCall";
182 case AlphaISD::RET_FLAG: return "Alpha::RET_FLAG";
183 case AlphaISD::COND_BRANCH_I: return "Alpha::COND_BRANCH_I";
184 case AlphaISD::COND_BRANCH_F: return "Alpha::COND_BRANCH_F";
188 /// getFunctionAlignment - Return the Log2 alignment of this function.
189 unsigned AlphaTargetLowering::getFunctionAlignment(const Function *F) const {
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 SDValue Zero = DAG.getConstant(0, PtrVT);
198 // FIXME there isn't really any debug info here
199 DebugLoc dl = Op.getDebugLoc();
201 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, JTI,
202 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
203 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, JTI, Hi);
207 //http://www.cs.arizona.edu/computer.help/policy/DIGITAL_unix/
208 //AA-PY8AC-TET1_html/callCH3.html#BLOCK21
210 //For now, just use variable size stack frame format
212 //In a standard call, the first six items are passed in registers $16
213 //- $21 and/or registers $f16 - $f21. (See Section 4.1.2 for details
214 //of argument-to-register correspondence.) The remaining items are
215 //collected in a memory argument list that is a naturally aligned
216 //array of quadwords. In a standard call, this list, if present, must
217 //be passed at 0(SP).
218 //7 ... n 0(SP) ... (n-7)*8(SP)
226 #include "AlphaGenCallingConv.inc"
229 AlphaTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
230 CallingConv::ID CallConv, bool isVarArg,
232 const SmallVectorImpl<ISD::OutputArg> &Outs,
233 const SmallVectorImpl<ISD::InputArg> &Ins,
234 DebugLoc dl, SelectionDAG &DAG,
235 SmallVectorImpl<SDValue> &InVals) {
237 // Analyze operands of the call, assigning locations to each operand.
238 SmallVector<CCValAssign, 16> ArgLocs;
239 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
240 ArgLocs, *DAG.getContext());
242 CCInfo.AnalyzeCallOperands(Outs, CC_Alpha);
244 // Get a count of how many bytes are to be pushed on the stack.
245 unsigned NumBytes = CCInfo.getNextStackOffset();
247 Chain = DAG.getCALLSEQ_START(Chain, DAG.getConstant(NumBytes,
248 getPointerTy(), true));
250 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
251 SmallVector<SDValue, 12> MemOpChains;
254 // Walk the register/memloc assignments, inserting copies/loads.
255 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
256 CCValAssign &VA = ArgLocs[i];
258 SDValue Arg = Outs[i].Val;
260 // Promote the value if needed.
261 switch (VA.getLocInfo()) {
262 default: assert(0 && "Unknown loc info!");
263 case CCValAssign::Full: break;
264 case CCValAssign::SExt:
265 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
267 case CCValAssign::ZExt:
268 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
270 case CCValAssign::AExt:
271 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
275 // Arguments that can be passed on register must be kept at RegsToPass
278 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
280 assert(VA.isMemLoc());
282 if (StackPtr.getNode() == 0)
283 StackPtr = DAG.getCopyFromReg(Chain, dl, Alpha::R30, MVT::i64);
285 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
287 DAG.getIntPtrConstant(VA.getLocMemOffset()));
289 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
290 PseudoSourceValue::getStack(), 0));
294 // Transform all store nodes into one single node because all store nodes are
295 // independent of each other.
296 if (!MemOpChains.empty())
297 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
298 &MemOpChains[0], MemOpChains.size());
300 // Build a sequence of copy-to-reg nodes chained together with token chain and
301 // flag operands which copy the outgoing args into registers. The InFlag in
302 // necessary since all emited instructions must be stuck together.
304 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
305 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
306 RegsToPass[i].second, InFlag);
307 InFlag = Chain.getValue(1);
310 // Returns a chain & a flag for retval copy to use.
311 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
312 SmallVector<SDValue, 8> Ops;
313 Ops.push_back(Chain);
314 Ops.push_back(Callee);
316 // Add argument registers to the end of the list so that they are
317 // known live into the call.
318 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
319 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
320 RegsToPass[i].second.getValueType()));
322 if (InFlag.getNode())
323 Ops.push_back(InFlag);
325 Chain = DAG.getNode(AlphaISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
326 InFlag = Chain.getValue(1);
328 // Create the CALLSEQ_END node.
329 Chain = DAG.getCALLSEQ_END(Chain,
330 DAG.getConstant(NumBytes, getPointerTy(), true),
331 DAG.getConstant(0, getPointerTy(), true),
333 InFlag = Chain.getValue(1);
335 // Handle result values, copying them out of physregs into vregs that we
337 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
338 Ins, dl, DAG, InVals);
341 /// LowerCallResult - Lower the result values of a call into the
342 /// appropriate copies out of appropriate physical registers.
345 AlphaTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
346 CallingConv::ID CallConv, bool isVarArg,
347 const SmallVectorImpl<ISD::InputArg> &Ins,
348 DebugLoc dl, SelectionDAG &DAG,
349 SmallVectorImpl<SDValue> &InVals) {
351 // Assign locations to each value returned by this call.
352 SmallVector<CCValAssign, 16> RVLocs;
353 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs,
356 CCInfo.AnalyzeCallResult(Ins, RetCC_Alpha);
358 // Copy all of the result registers out of their specified physreg.
359 for (unsigned i = 0; i != RVLocs.size(); ++i) {
360 CCValAssign &VA = RVLocs[i];
362 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
363 VA.getLocVT(), InFlag).getValue(1);
364 SDValue RetValue = Chain.getValue(0);
365 InFlag = Chain.getValue(2);
367 // If this is an 8/16/32-bit value, it is really passed promoted to 64
368 // bits. Insert an assert[sz]ext to capture this, then truncate to the
370 if (VA.getLocInfo() == CCValAssign::SExt)
371 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
372 DAG.getValueType(VA.getValVT()));
373 else if (VA.getLocInfo() == CCValAssign::ZExt)
374 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
375 DAG.getValueType(VA.getValVT()));
377 if (VA.getLocInfo() != CCValAssign::Full)
378 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
380 InVals.push_back(RetValue);
387 AlphaTargetLowering::LowerFormalArguments(SDValue Chain,
388 CallingConv::ID CallConv, bool isVarArg,
389 const SmallVectorImpl<ISD::InputArg>
391 DebugLoc dl, SelectionDAG &DAG,
392 SmallVectorImpl<SDValue> &InVals) {
394 MachineFunction &MF = DAG.getMachineFunction();
395 MachineFrameInfo *MFI = MF.getFrameInfo();
397 unsigned args_int[] = {
398 Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21};
399 unsigned args_float[] = {
400 Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21};
402 for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
404 EVT ObjectVT = Ins[ArgNo].VT;
408 switch (ObjectVT.getSimpleVT().SimpleTy) {
410 assert(false && "Invalid value type!");
412 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
413 &Alpha::F8RCRegClass);
414 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
417 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
418 &Alpha::F4RCRegClass);
419 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
422 args_int[ArgNo] = AddLiveIn(MF, args_int[ArgNo],
423 &Alpha::GPRCRegClass);
424 ArgVal = DAG.getCopyFromReg(Chain, dl, args_int[ArgNo], MVT::i64);
428 // Create the frame index object for this incoming parameter...
429 int FI = MFI->CreateFixedObject(8, 8 * (ArgNo - 6));
431 // Create the SelectionDAG nodes corresponding to a load
432 //from this parameter
433 SDValue FIN = DAG.getFrameIndex(FI, MVT::i64);
434 ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, NULL, 0);
436 InVals.push_back(ArgVal);
439 // If the functions takes variable number of arguments, copy all regs to stack
441 VarArgsOffset = Ins.size() * 8;
442 std::vector<SDValue> LS;
443 for (int i = 0; i < 6; ++i) {
444 if (TargetRegisterInfo::isPhysicalRegister(args_int[i]))
445 args_int[i] = AddLiveIn(MF, args_int[i], &Alpha::GPRCRegClass);
446 SDValue argt = DAG.getCopyFromReg(Chain, dl, args_int[i], MVT::i64);
447 int FI = MFI->CreateFixedObject(8, -8 * (6 - i));
448 if (i == 0) VarArgsBase = FI;
449 SDValue SDFI = DAG.getFrameIndex(FI, MVT::i64);
450 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, NULL, 0));
452 if (TargetRegisterInfo::isPhysicalRegister(args_float[i]))
453 args_float[i] = AddLiveIn(MF, args_float[i], &Alpha::F8RCRegClass);
454 argt = DAG.getCopyFromReg(Chain, dl, args_float[i], MVT::f64);
455 FI = MFI->CreateFixedObject(8, - 8 * (12 - i));
456 SDFI = DAG.getFrameIndex(FI, MVT::i64);
457 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, NULL, 0));
460 //Set up a token factor with all the stack traffic
461 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &LS[0], LS.size());
468 AlphaTargetLowering::LowerReturn(SDValue Chain,
469 CallingConv::ID CallConv, bool isVarArg,
470 const SmallVectorImpl<ISD::OutputArg> &Outs,
471 DebugLoc dl, SelectionDAG &DAG) {
473 SDValue Copy = DAG.getCopyToReg(Chain, dl, Alpha::R26,
474 DAG.getNode(AlphaISD::GlobalRetAddr,
475 DebugLoc::getUnknownLoc(),
478 switch (Outs.size()) {
480 llvm_unreachable("Do not know how to return this many arguments!");
483 //return SDValue(); // ret void is legal
485 EVT ArgVT = Outs[0].Val.getValueType();
487 if (ArgVT.isInteger())
490 assert(ArgVT.isFloatingPoint());
493 Copy = DAG.getCopyToReg(Copy, dl, ArgReg,
494 Outs[0].Val, Copy.getValue(1));
495 if (DAG.getMachineFunction().getRegInfo().liveout_empty())
496 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg);
500 EVT ArgVT = Outs[0].Val.getValueType();
501 unsigned ArgReg1, ArgReg2;
502 if (ArgVT.isInteger()) {
506 assert(ArgVT.isFloatingPoint());
510 Copy = DAG.getCopyToReg(Copy, dl, ArgReg1,
511 Outs[0].Val, Copy.getValue(1));
512 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
513 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg1)
514 == DAG.getMachineFunction().getRegInfo().liveout_end())
515 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg1);
516 Copy = DAG.getCopyToReg(Copy, dl, ArgReg2,
517 Outs[1].Val, Copy.getValue(1));
518 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
519 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg2)
520 == DAG.getMachineFunction().getRegInfo().liveout_end())
521 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg2);
525 return DAG.getNode(AlphaISD::RET_FLAG, dl,
526 MVT::Other, Copy, Copy.getValue(1));
529 void AlphaTargetLowering::LowerVAARG(SDNode *N, SDValue &Chain,
530 SDValue &DataPtr, SelectionDAG &DAG) {
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, VAListS, 0);
537 SDValue Tmp = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
538 DAG.getConstant(8, MVT::i64));
539 SDValue Offset = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Base.getValue(1),
540 Tmp, NULL, 0, MVT::i32);
541 DataPtr = DAG.getNode(ISD::ADD, dl, MVT::i64, Base, Offset);
542 if (N->getValueType(0).isFloatingPoint())
544 //if fp && Offset < 6*8, then subtract 6*8 from DataPtr
545 SDValue FPDataPtr = DAG.getNode(ISD::SUB, dl, MVT::i64, DataPtr,
546 DAG.getConstant(8*6, MVT::i64));
547 SDValue CC = DAG.getSetCC(dl, MVT::i64, Offset,
548 DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
549 DataPtr = DAG.getNode(ISD::SELECT, dl, MVT::i64, CC, FPDataPtr, DataPtr);
552 SDValue NewOffset = DAG.getNode(ISD::ADD, dl, MVT::i64, Offset,
553 DAG.getConstant(8, MVT::i64));
554 Chain = DAG.getTruncStore(Offset.getValue(1), dl, NewOffset, Tmp, NULL, 0,
558 /// LowerOperation - Provide custom lowering hooks for some operations.
560 SDValue AlphaTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
561 DebugLoc dl = Op.getDebugLoc();
562 switch (Op.getOpcode()) {
563 default: llvm_unreachable("Wasn't expecting to be able to lower this!");
564 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
566 case ISD::INTRINSIC_WO_CHAIN: {
567 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
569 default: break; // Don't custom lower most intrinsics.
570 case Intrinsic::alpha_umulh:
571 return DAG.getNode(ISD::MULHU, dl, MVT::i64,
572 Op.getOperand(1), Op.getOperand(2));
576 case ISD::SRL_PARTS: {
577 SDValue ShOpLo = Op.getOperand(0);
578 SDValue ShOpHi = Op.getOperand(1);
579 SDValue ShAmt = Op.getOperand(2);
580 SDValue bm = DAG.getNode(ISD::SUB, dl, MVT::i64,
581 DAG.getConstant(64, MVT::i64), ShAmt);
582 SDValue BMCC = DAG.getSetCC(dl, MVT::i64, bm,
583 DAG.getConstant(0, MVT::i64), ISD::SETLE);
584 // if 64 - shAmt <= 0
585 SDValue Hi_Neg = DAG.getConstant(0, MVT::i64);
586 SDValue ShAmt_Neg = DAG.getNode(ISD::SUB, dl, MVT::i64,
587 DAG.getConstant(0, MVT::i64), bm);
588 SDValue Lo_Neg = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt_Neg);
590 SDValue carries = DAG.getNode(ISD::SHL, dl, MVT::i64, ShOpHi, bm);
591 SDValue Hi_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt);
592 SDValue Lo_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpLo, ShAmt);
593 Lo_Pos = DAG.getNode(ISD::OR, dl, MVT::i64, Lo_Pos, carries);
595 SDValue Hi = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Hi_Neg, Hi_Pos);
596 SDValue Lo = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Lo_Neg, Lo_Pos);
597 SDValue Ops[2] = { Lo, Hi };
598 return DAG.getMergeValues(Ops, 2, dl);
600 // case ISD::SRA_PARTS:
602 // case ISD::SHL_PARTS:
605 case ISD::SINT_TO_FP: {
606 assert(Op.getOperand(0).getValueType() == MVT::i64 &&
607 "Unhandled SINT_TO_FP type in custom expander!");
609 bool isDouble = Op.getValueType() == MVT::f64;
610 LD = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op.getOperand(0));
611 SDValue FP = DAG.getNode(isDouble?AlphaISD::CVTQT_:AlphaISD::CVTQS_, dl,
612 isDouble?MVT::f64:MVT::f32, LD);
615 case ISD::FP_TO_SINT: {
616 bool isDouble = Op.getOperand(0).getValueType() == MVT::f64;
617 SDValue src = Op.getOperand(0);
619 if (!isDouble) //Promote
620 src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, src);
622 src = DAG.getNode(AlphaISD::CVTTQ_, dl, MVT::f64, src);
624 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i64, src);
626 case ISD::ConstantPool: {
627 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
628 Constant *C = CP->getConstVal();
629 SDValue CPI = DAG.getTargetConstantPool(C, MVT::i64, CP->getAlignment());
630 // FIXME there isn't really any debug info here
632 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, CPI,
633 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
634 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, CPI, Hi);
637 case ISD::GlobalTLSAddress:
638 llvm_unreachable("TLS not implemented for Alpha.");
639 case ISD::GlobalAddress: {
640 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
641 GlobalValue *GV = GSDN->getGlobal();
642 SDValue GA = DAG.getTargetGlobalAddress(GV, MVT::i64, GSDN->getOffset());
643 // FIXME there isn't really any debug info here
645 // if (!GV->hasWeakLinkage() && !GV->isDeclaration() && !GV->hasLinkOnceLinkage()) {
646 if (GV->hasLocalLinkage()) {
647 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, GA,
648 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
649 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, GA, Hi);
652 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64, GA,
653 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
655 case ISD::ExternalSymbol: {
656 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64,
657 DAG.getTargetExternalSymbol(cast<ExternalSymbolSDNode>(Op)
658 ->getSymbol(), MVT::i64),
659 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
664 //Expand only on constant case
665 if (Op.getOperand(1).getOpcode() == ISD::Constant) {
666 EVT VT = Op.getNode()->getValueType(0);
667 SDValue Tmp1 = Op.getNode()->getOpcode() == ISD::UREM ?
668 BuildUDIV(Op.getNode(), DAG, NULL) :
669 BuildSDIV(Op.getNode(), DAG, NULL);
670 Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Op.getOperand(1));
671 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Op.getOperand(0), Tmp1);
677 if (Op.getValueType().isInteger()) {
678 if (Op.getOperand(1).getOpcode() == ISD::Constant)
679 return Op.getOpcode() == ISD::SDIV ? BuildSDIV(Op.getNode(), DAG, NULL)
680 : BuildUDIV(Op.getNode(), DAG, NULL);
681 const char* opstr = 0;
682 switch (Op.getOpcode()) {
683 case ISD::UREM: opstr = "__remqu"; break;
684 case ISD::SREM: opstr = "__remq"; break;
685 case ISD::UDIV: opstr = "__divqu"; break;
686 case ISD::SDIV: opstr = "__divq"; break;
688 SDValue Tmp1 = Op.getOperand(0),
689 Tmp2 = Op.getOperand(1),
690 Addr = DAG.getExternalSymbol(opstr, MVT::i64);
691 return DAG.getNode(AlphaISD::DivCall, dl, MVT::i64, Addr, Tmp1, Tmp2);
696 SDValue Chain, DataPtr;
697 LowerVAARG(Op.getNode(), Chain, DataPtr, DAG);
700 if (Op.getValueType() == MVT::i32)
701 Result = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Chain, DataPtr,
704 Result = DAG.getLoad(Op.getValueType(), dl, Chain, DataPtr, NULL, 0);
708 SDValue Chain = Op.getOperand(0);
709 SDValue DestP = Op.getOperand(1);
710 SDValue SrcP = Op.getOperand(2);
711 const Value *DestS = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
712 const Value *SrcS = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
714 SDValue Val = DAG.getLoad(getPointerTy(), dl, Chain, SrcP, SrcS, 0);
715 SDValue Result = DAG.getStore(Val.getValue(1), dl, Val, DestP, DestS, 0);
716 SDValue NP = DAG.getNode(ISD::ADD, dl, MVT::i64, SrcP,
717 DAG.getConstant(8, MVT::i64));
718 Val = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Result,
719 NP, NULL,0, MVT::i32);
720 SDValue NPD = DAG.getNode(ISD::ADD, dl, MVT::i64, DestP,
721 DAG.getConstant(8, MVT::i64));
722 return DAG.getTruncStore(Val.getValue(1), dl, Val, NPD, NULL, 0, MVT::i32);
725 SDValue Chain = Op.getOperand(0);
726 SDValue VAListP = Op.getOperand(1);
727 const Value *VAListS = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
729 // vastart stores the address of the VarArgsBase and VarArgsOffset
730 SDValue FR = DAG.getFrameIndex(VarArgsBase, MVT::i64);
731 SDValue S1 = DAG.getStore(Chain, dl, FR, VAListP, VAListS, 0);
732 SDValue SA2 = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
733 DAG.getConstant(8, MVT::i64));
734 return DAG.getTruncStore(S1, dl, DAG.getConstant(VarArgsOffset, MVT::i64),
735 SA2, NULL, 0, MVT::i32);
737 case ISD::RETURNADDR:
738 return DAG.getNode(AlphaISD::GlobalRetAddr, DebugLoc::getUnknownLoc(),
741 case ISD::FRAMEADDR: break;
747 void AlphaTargetLowering::ReplaceNodeResults(SDNode *N,
748 SmallVectorImpl<SDValue>&Results,
750 DebugLoc dl = N->getDebugLoc();
751 assert(N->getValueType(0) == MVT::i32 &&
752 N->getOpcode() == ISD::VAARG &&
753 "Unknown node to custom promote!");
755 SDValue Chain, DataPtr;
756 LowerVAARG(N, Chain, DataPtr, DAG);
757 SDValue Res = DAG.getLoad(N->getValueType(0), dl, Chain, DataPtr, NULL, 0);
758 Results.push_back(Res);
759 Results.push_back(SDValue(Res.getNode(), 1));
765 /// getConstraintType - Given a constraint letter, return the type of
766 /// constraint it is for this target.
767 AlphaTargetLowering::ConstraintType
768 AlphaTargetLowering::getConstraintType(const std::string &Constraint) const {
769 if (Constraint.size() == 1) {
770 switch (Constraint[0]) {
774 return C_RegisterClass;
777 return TargetLowering::getConstraintType(Constraint);
780 std::vector<unsigned> AlphaTargetLowering::
781 getRegClassForInlineAsmConstraint(const std::string &Constraint,
783 if (Constraint.size() == 1) {
784 switch (Constraint[0]) {
785 default: break; // Unknown constriant letter
787 return make_vector<unsigned>(Alpha::F0 , Alpha::F1 , Alpha::F2 ,
788 Alpha::F3 , Alpha::F4 , Alpha::F5 ,
789 Alpha::F6 , Alpha::F7 , Alpha::F8 ,
790 Alpha::F9 , Alpha::F10, Alpha::F11,
791 Alpha::F12, Alpha::F13, Alpha::F14,
792 Alpha::F15, Alpha::F16, Alpha::F17,
793 Alpha::F18, Alpha::F19, Alpha::F20,
794 Alpha::F21, Alpha::F22, Alpha::F23,
795 Alpha::F24, Alpha::F25, Alpha::F26,
796 Alpha::F27, Alpha::F28, Alpha::F29,
797 Alpha::F30, Alpha::F31, 0);
799 return make_vector<unsigned>(Alpha::R0 , Alpha::R1 , Alpha::R2 ,
800 Alpha::R3 , Alpha::R4 , Alpha::R5 ,
801 Alpha::R6 , Alpha::R7 , Alpha::R8 ,
802 Alpha::R9 , Alpha::R10, Alpha::R11,
803 Alpha::R12, Alpha::R13, Alpha::R14,
804 Alpha::R15, Alpha::R16, Alpha::R17,
805 Alpha::R18, Alpha::R19, Alpha::R20,
806 Alpha::R21, Alpha::R22, Alpha::R23,
807 Alpha::R24, Alpha::R25, Alpha::R26,
808 Alpha::R27, Alpha::R28, Alpha::R29,
809 Alpha::R30, Alpha::R31, 0);
813 return std::vector<unsigned>();
815 //===----------------------------------------------------------------------===//
816 // Other Lowering Code
817 //===----------------------------------------------------------------------===//
820 AlphaTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
821 MachineBasicBlock *BB,
822 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
823 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
824 assert((MI->getOpcode() == Alpha::CAS32 ||
825 MI->getOpcode() == Alpha::CAS64 ||
826 MI->getOpcode() == Alpha::LAS32 ||
827 MI->getOpcode() == Alpha::LAS64 ||
828 MI->getOpcode() == Alpha::SWAP32 ||
829 MI->getOpcode() == Alpha::SWAP64) &&
830 "Unexpected instr type to insert");
832 bool is32 = MI->getOpcode() == Alpha::CAS32 ||
833 MI->getOpcode() == Alpha::LAS32 ||
834 MI->getOpcode() == Alpha::SWAP32;
836 //Load locked store conditional for atomic ops take on the same form
839 //do stuff (maybe branch to exit)
841 //test sc and maybe branck to start
843 const BasicBlock *LLVM_BB = BB->getBasicBlock();
844 DebugLoc dl = MI->getDebugLoc();
845 MachineFunction::iterator It = BB;
848 MachineBasicBlock *thisMBB = BB;
849 MachineFunction *F = BB->getParent();
850 MachineBasicBlock *llscMBB = F->CreateMachineBasicBlock(LLVM_BB);
851 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
853 // Inform sdisel of the edge changes.
854 for (MachineBasicBlock::succ_iterator I = BB->succ_begin(),
855 E = BB->succ_end(); I != E; ++I)
856 EM->insert(std::make_pair(*I, sinkMBB));
858 sinkMBB->transferSuccessors(thisMBB);
860 F->insert(It, llscMBB);
861 F->insert(It, sinkMBB);
863 BuildMI(thisMBB, dl, TII->get(Alpha::BR)).addMBB(llscMBB);
865 unsigned reg_res = MI->getOperand(0).getReg(),
866 reg_ptr = MI->getOperand(1).getReg(),
867 reg_v2 = MI->getOperand(2).getReg(),
868 reg_store = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
870 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::LDL_L : Alpha::LDQ_L),
871 reg_res).addImm(0).addReg(reg_ptr);
872 switch (MI->getOpcode()) {
876 = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
877 BuildMI(llscMBB, dl, TII->get(Alpha::CMPEQ), reg_cmp)
878 .addReg(reg_v2).addReg(reg_res);
879 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
880 .addImm(0).addReg(reg_cmp).addMBB(sinkMBB);
881 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
882 .addReg(Alpha::R31).addReg(MI->getOperand(3).getReg());
887 BuildMI(llscMBB, dl,TII->get(is32 ? Alpha::ADDLr : Alpha::ADDQr), reg_store)
888 .addReg(reg_res).addReg(reg_v2);
892 case Alpha::SWAP64: {
893 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
894 .addReg(reg_v2).addReg(reg_v2);
898 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::STL_C : Alpha::STQ_C), reg_store)
899 .addReg(reg_store).addImm(0).addReg(reg_ptr);
900 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
901 .addImm(0).addReg(reg_store).addMBB(llscMBB);
902 BuildMI(llscMBB, dl, TII->get(Alpha::BR)).addMBB(sinkMBB);
904 thisMBB->addSuccessor(llscMBB);
905 llscMBB->addSuccessor(llscMBB);
906 llscMBB->addSuccessor(sinkMBB);
907 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
913 AlphaTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
914 // The Alpha target isn't yet aware of offsets.
918 bool AlphaTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
919 if (VT != MVT::f32 && VT != MVT::f64)
925 return Imm.isZero() || Imm.isNegZero();