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);
111 // We don't support sin/cos/sqrt/pow
112 setOperationAction(ISD::FSIN , MVT::f64, Expand);
113 setOperationAction(ISD::FCOS , MVT::f64, Expand);
114 setOperationAction(ISD::FSIN , MVT::f32, Expand);
115 setOperationAction(ISD::FCOS , MVT::f32, Expand);
117 setOperationAction(ISD::FSQRT, MVT::f64, Expand);
118 setOperationAction(ISD::FSQRT, MVT::f32, Expand);
120 setOperationAction(ISD::FPOW , MVT::f32, Expand);
121 setOperationAction(ISD::FPOW , MVT::f64, Expand);
123 setOperationAction(ISD::SETCC, MVT::f32, Promote);
125 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Promote);
127 // We don't have line number support yet.
128 setOperationAction(ISD::DBG_STOPPOINT, MVT::Other, Expand);
129 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
130 setOperationAction(ISD::DBG_LABEL, MVT::Other, Expand);
131 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
133 // Not implemented yet.
134 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
135 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
136 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
138 // We want to legalize GlobalAddress and ConstantPool and
139 // ExternalSymbols nodes into the appropriate instructions to
140 // materialize the address.
141 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
142 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
143 setOperationAction(ISD::ExternalSymbol, MVT::i64, Custom);
144 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
146 setOperationAction(ISD::VASTART, MVT::Other, Custom);
147 setOperationAction(ISD::VAEND, MVT::Other, Expand);
148 setOperationAction(ISD::VACOPY, MVT::Other, Custom);
149 setOperationAction(ISD::VAARG, MVT::Other, Custom);
150 setOperationAction(ISD::VAARG, MVT::i32, Custom);
152 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
153 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
155 setStackPointerRegisterToSaveRestore(Alpha::R30);
157 addLegalFPImmediate(APFloat(+0.0)); //F31
158 addLegalFPImmediate(APFloat(+0.0f)); //F31
159 addLegalFPImmediate(APFloat(-0.0)); //-F31
160 addLegalFPImmediate(APFloat(-0.0f)); //-F31
163 setJumpBufAlignment(16);
165 computeRegisterProperties();
168 MVT AlphaTargetLowering::getSetCCResultType(MVT 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 /// getFunctionAlignment - Return the Log2 alignment of this function.
191 unsigned AlphaTargetLowering::getFunctionAlignment(const Function *F) const {
195 static SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) {
196 MVT PtrVT = Op.getValueType();
197 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
198 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
199 SDValue Zero = DAG.getConstant(0, PtrVT);
200 // FIXME there isn't really any debug info here
201 DebugLoc dl = Op.getDebugLoc();
203 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, JTI,
204 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
205 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, JTI, Hi);
209 //http://www.cs.arizona.edu/computer.help/policy/DIGITAL_unix/
210 //AA-PY8AC-TET1_html/callCH3.html#BLOCK21
212 //For now, just use variable size stack frame format
214 //In a standard call, the first six items are passed in registers $16
215 //- $21 and/or registers $f16 - $f21. (See Section 4.1.2 for details
216 //of argument-to-register correspondence.) The remaining items are
217 //collected in a memory argument list that is a naturally aligned
218 //array of quadwords. In a standard call, this list, if present, must
219 //be passed at 0(SP).
220 //7 ... n 0(SP) ... (n-7)*8(SP)
228 #include "AlphaGenCallingConv.inc"
231 AlphaTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
232 unsigned CallConv, bool isVarArg,
234 const SmallVectorImpl<ISD::OutputArg> &Outs,
235 const SmallVectorImpl<ISD::InputArg> &Ins,
236 DebugLoc dl, SelectionDAG &DAG,
237 SmallVectorImpl<SDValue> &InVals) {
239 // Analyze operands of the call, assigning locations to each operand.
240 SmallVector<CCValAssign, 16> ArgLocs;
241 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
242 ArgLocs, *DAG.getContext());
244 CCInfo.AnalyzeCallOperands(Outs, CC_Alpha);
246 // Get a count of how many bytes are to be pushed on the stack.
247 unsigned NumBytes = CCInfo.getNextStackOffset();
249 Chain = DAG.getCALLSEQ_START(Chain, DAG.getConstant(NumBytes,
250 getPointerTy(), true));
252 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
253 SmallVector<SDValue, 12> MemOpChains;
256 // Walk the register/memloc assignments, inserting copies/loads.
257 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
258 CCValAssign &VA = ArgLocs[i];
260 SDValue Arg = Outs[i].Val;
262 // Promote the value if needed.
263 switch (VA.getLocInfo()) {
264 default: assert(0 && "Unknown loc info!");
265 case CCValAssign::Full: break;
266 case CCValAssign::SExt:
267 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
269 case CCValAssign::ZExt:
270 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
272 case CCValAssign::AExt:
273 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
277 // Arguments that can be passed on register must be kept at RegsToPass
280 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
282 assert(VA.isMemLoc());
284 if (StackPtr.getNode() == 0)
285 StackPtr = DAG.getCopyFromReg(Chain, dl, Alpha::R30, MVT::i64);
287 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
289 DAG.getIntPtrConstant(VA.getLocMemOffset()));
291 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
292 PseudoSourceValue::getStack(), 0));
296 // Transform all store nodes into one single node because all store nodes are
297 // independent of each other.
298 if (!MemOpChains.empty())
299 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
300 &MemOpChains[0], MemOpChains.size());
302 // Build a sequence of copy-to-reg nodes chained together with token chain and
303 // flag operands which copy the outgoing args into registers. The InFlag in
304 // necessary since all emited instructions must be stuck together.
306 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
307 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
308 RegsToPass[i].second, InFlag);
309 InFlag = Chain.getValue(1);
312 // Returns a chain & a flag for retval copy to use.
313 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
314 SmallVector<SDValue, 8> Ops;
315 Ops.push_back(Chain);
316 Ops.push_back(Callee);
318 // Add argument registers to the end of the list so that they are
319 // known live into the call.
320 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
321 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
322 RegsToPass[i].second.getValueType()));
324 if (InFlag.getNode())
325 Ops.push_back(InFlag);
327 Chain = DAG.getNode(AlphaISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
328 InFlag = Chain.getValue(1);
330 // Create the CALLSEQ_END node.
331 Chain = DAG.getCALLSEQ_END(Chain,
332 DAG.getConstant(NumBytes, getPointerTy(), true),
333 DAG.getConstant(0, getPointerTy(), true),
335 InFlag = Chain.getValue(1);
337 // Handle result values, copying them out of physregs into vregs that we
339 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
340 Ins, dl, DAG, InVals);
343 /// LowerCallResult - Lower the result values of a call into the
344 /// appropriate copies out of appropriate physical registers.
347 AlphaTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
348 unsigned CallConv, bool isVarArg,
349 const SmallVectorImpl<ISD::InputArg> &Ins,
350 DebugLoc dl, SelectionDAG &DAG,
351 SmallVectorImpl<SDValue> &InVals) {
353 // Assign locations to each value returned by this call.
354 SmallVector<CCValAssign, 16> RVLocs;
355 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs,
358 CCInfo.AnalyzeCallResult(Ins, RetCC_Alpha);
360 // Copy all of the result registers out of their specified physreg.
361 for (unsigned i = 0; i != RVLocs.size(); ++i) {
362 CCValAssign &VA = RVLocs[i];
364 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
365 VA.getLocVT(), InFlag).getValue(1);
366 SDValue RetValue = Chain.getValue(0);
367 InFlag = Chain.getValue(2);
369 // If this is an 8/16/32-bit value, it is really passed promoted to 64
370 // bits. Insert an assert[sz]ext to capture this, then truncate to the
372 if (VA.getLocInfo() == CCValAssign::SExt)
373 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
374 DAG.getValueType(VA.getValVT()));
375 else if (VA.getLocInfo() == CCValAssign::ZExt)
376 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
377 DAG.getValueType(VA.getValVT()));
379 if (VA.getLocInfo() != CCValAssign::Full)
380 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
382 InVals.push_back(RetValue);
389 AlphaTargetLowering::LowerFormalArguments(SDValue Chain,
390 unsigned CallConv, bool isVarArg,
391 const SmallVectorImpl<ISD::InputArg>
393 DebugLoc dl, SelectionDAG &DAG,
394 SmallVectorImpl<SDValue> &InVals) {
396 MachineFunction &MF = DAG.getMachineFunction();
397 MachineFrameInfo *MFI = MF.getFrameInfo();
399 unsigned args_int[] = {
400 Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21};
401 unsigned args_float[] = {
402 Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21};
404 for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
406 MVT ObjectVT = Ins[ArgNo].VT;
410 switch (ObjectVT.getSimpleVT()) {
412 assert(false && "Invalid value type!");
414 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
415 &Alpha::F8RCRegClass);
416 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
419 args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
420 &Alpha::F4RCRegClass);
421 ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
424 args_int[ArgNo] = AddLiveIn(MF, args_int[ArgNo],
425 &Alpha::GPRCRegClass);
426 ArgVal = DAG.getCopyFromReg(Chain, dl, args_int[ArgNo], MVT::i64);
430 // Create the frame index object for this incoming parameter...
431 int FI = MFI->CreateFixedObject(8, 8 * (ArgNo - 6));
433 // Create the SelectionDAG nodes corresponding to a load
434 //from this parameter
435 SDValue FIN = DAG.getFrameIndex(FI, MVT::i64);
436 ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, NULL, 0);
438 InVals.push_back(ArgVal);
441 // If the functions takes variable number of arguments, copy all regs to stack
443 VarArgsOffset = 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));
450 if (i == 0) VarArgsBase = FI;
451 SDValue SDFI = DAG.getFrameIndex(FI, MVT::i64);
452 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, NULL, 0));
454 if (TargetRegisterInfo::isPhysicalRegister(args_float[i]))
455 args_float[i] = AddLiveIn(MF, args_float[i], &Alpha::F8RCRegClass);
456 argt = DAG.getCopyFromReg(Chain, dl, args_float[i], MVT::f64);
457 FI = MFI->CreateFixedObject(8, - 8 * (12 - i));
458 SDFI = DAG.getFrameIndex(FI, MVT::i64);
459 LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, NULL, 0));
462 //Set up a token factor with all the stack traffic
463 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &LS[0], LS.size());
470 AlphaTargetLowering::LowerReturn(SDValue Chain,
471 unsigned CallConv, bool isVarArg,
472 const SmallVectorImpl<ISD::OutputArg> &Outs,
473 DebugLoc dl, SelectionDAG &DAG) {
475 SDValue Copy = DAG.getCopyToReg(Chain, dl, Alpha::R26,
476 DAG.getNode(AlphaISD::GlobalRetAddr,
477 DebugLoc::getUnknownLoc(),
480 switch (Outs.size()) {
482 llvm_unreachable("Do not know how to return this many arguments!");
485 //return SDValue(); // ret void is legal
487 MVT ArgVT = Outs[0].Val.getValueType();
489 if (ArgVT.isInteger())
492 assert(ArgVT.isFloatingPoint());
495 Copy = DAG.getCopyToReg(Copy, dl, ArgReg,
496 Outs[0].Val, Copy.getValue(1));
497 if (DAG.getMachineFunction().getRegInfo().liveout_empty())
498 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg);
502 MVT ArgVT = Outs[0].Val.getValueType();
503 unsigned ArgReg1, ArgReg2;
504 if (ArgVT.isInteger()) {
508 assert(ArgVT.isFloatingPoint());
512 Copy = DAG.getCopyToReg(Copy, dl, ArgReg1,
513 Outs[0].Val, Copy.getValue(1));
514 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
515 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg1)
516 == DAG.getMachineFunction().getRegInfo().liveout_end())
517 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg1);
518 Copy = DAG.getCopyToReg(Copy, dl, ArgReg2,
519 Outs[1].Val, Copy.getValue(1));
520 if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
521 DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg2)
522 == DAG.getMachineFunction().getRegInfo().liveout_end())
523 DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg2);
527 return DAG.getNode(AlphaISD::RET_FLAG, dl,
528 MVT::Other, Copy, Copy.getValue(1));
531 void AlphaTargetLowering::LowerVAARG(SDNode *N, SDValue &Chain,
532 SDValue &DataPtr, SelectionDAG &DAG) {
533 Chain = N->getOperand(0);
534 SDValue VAListP = N->getOperand(1);
535 const Value *VAListS = cast<SrcValueSDNode>(N->getOperand(2))->getValue();
536 DebugLoc dl = N->getDebugLoc();
538 SDValue Base = DAG.getLoad(MVT::i64, dl, Chain, VAListP, VAListS, 0);
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, NULL, 0, MVT::i32);
543 DataPtr = DAG.getNode(ISD::ADD, dl, MVT::i64, Base, Offset);
544 if (N->getValueType(0).isFloatingPoint())
546 //if fp && Offset < 6*8, then subtract 6*8 from DataPtr
547 SDValue FPDataPtr = DAG.getNode(ISD::SUB, dl, MVT::i64, DataPtr,
548 DAG.getConstant(8*6, MVT::i64));
549 SDValue CC = DAG.getSetCC(dl, MVT::i64, Offset,
550 DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
551 DataPtr = DAG.getNode(ISD::SELECT, dl, MVT::i64, CC, FPDataPtr, DataPtr);
554 SDValue NewOffset = DAG.getNode(ISD::ADD, dl, MVT::i64, Offset,
555 DAG.getConstant(8, MVT::i64));
556 Chain = DAG.getTruncStore(Offset.getValue(1), dl, NewOffset, Tmp, NULL, 0,
560 /// LowerOperation - Provide custom lowering hooks for some operations.
562 SDValue AlphaTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
563 DebugLoc dl = Op.getDebugLoc();
564 switch (Op.getOpcode()) {
565 default: llvm_unreachable("Wasn't expecting to be able to lower this!");
566 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
568 case ISD::INTRINSIC_WO_CHAIN: {
569 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
571 default: break; // Don't custom lower most intrinsics.
572 case Intrinsic::alpha_umulh:
573 return DAG.getNode(ISD::MULHU, dl, MVT::i64,
574 Op.getOperand(1), Op.getOperand(2));
578 case ISD::SINT_TO_FP: {
579 assert(Op.getOperand(0).getValueType() == MVT::i64 &&
580 "Unhandled SINT_TO_FP type in custom expander!");
582 bool isDouble = Op.getValueType() == MVT::f64;
583 LD = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op.getOperand(0));
584 SDValue FP = DAG.getNode(isDouble?AlphaISD::CVTQT_:AlphaISD::CVTQS_, dl,
585 isDouble?MVT::f64:MVT::f32, LD);
588 case ISD::FP_TO_SINT: {
589 bool isDouble = Op.getOperand(0).getValueType() == MVT::f64;
590 SDValue src = Op.getOperand(0);
592 if (!isDouble) //Promote
593 src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, src);
595 src = DAG.getNode(AlphaISD::CVTTQ_, dl, MVT::f64, src);
597 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i64, src);
599 case ISD::ConstantPool: {
600 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
601 Constant *C = CP->getConstVal();
602 SDValue CPI = DAG.getTargetConstantPool(C, MVT::i64, CP->getAlignment());
603 // FIXME there isn't really any debug info here
605 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, CPI,
606 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
607 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, CPI, Hi);
610 case ISD::GlobalTLSAddress:
611 llvm_unreachable("TLS not implemented for Alpha.");
612 case ISD::GlobalAddress: {
613 GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
614 GlobalValue *GV = GSDN->getGlobal();
615 SDValue GA = DAG.getTargetGlobalAddress(GV, MVT::i64, GSDN->getOffset());
616 // FIXME there isn't really any debug info here
618 // if (!GV->hasWeakLinkage() && !GV->isDeclaration() && !GV->hasLinkOnceLinkage()) {
619 if (GV->hasLocalLinkage()) {
620 SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, GA,
621 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
622 SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, GA, Hi);
625 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64, GA,
626 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
628 case ISD::ExternalSymbol: {
629 return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64,
630 DAG.getTargetExternalSymbol(cast<ExternalSymbolSDNode>(Op)
631 ->getSymbol(), MVT::i64),
632 DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
637 //Expand only on constant case
638 if (Op.getOperand(1).getOpcode() == ISD::Constant) {
639 MVT VT = Op.getNode()->getValueType(0);
640 SDValue Tmp1 = Op.getNode()->getOpcode() == ISD::UREM ?
641 BuildUDIV(Op.getNode(), DAG, NULL) :
642 BuildSDIV(Op.getNode(), DAG, NULL);
643 Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Op.getOperand(1));
644 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Op.getOperand(0), Tmp1);
650 if (Op.getValueType().isInteger()) {
651 if (Op.getOperand(1).getOpcode() == ISD::Constant)
652 return Op.getOpcode() == ISD::SDIV ? BuildSDIV(Op.getNode(), DAG, NULL)
653 : BuildUDIV(Op.getNode(), DAG, NULL);
654 const char* opstr = 0;
655 switch (Op.getOpcode()) {
656 case ISD::UREM: opstr = "__remqu"; break;
657 case ISD::SREM: opstr = "__remq"; break;
658 case ISD::UDIV: opstr = "__divqu"; break;
659 case ISD::SDIV: opstr = "__divq"; break;
661 SDValue Tmp1 = Op.getOperand(0),
662 Tmp2 = Op.getOperand(1),
663 Addr = DAG.getExternalSymbol(opstr, MVT::i64);
664 return DAG.getNode(AlphaISD::DivCall, dl, MVT::i64, Addr, Tmp1, Tmp2);
669 SDValue Chain, DataPtr;
670 LowerVAARG(Op.getNode(), Chain, DataPtr, DAG);
673 if (Op.getValueType() == MVT::i32)
674 Result = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Chain, DataPtr,
677 Result = DAG.getLoad(Op.getValueType(), dl, Chain, DataPtr, NULL, 0);
681 SDValue Chain = Op.getOperand(0);
682 SDValue DestP = Op.getOperand(1);
683 SDValue SrcP = Op.getOperand(2);
684 const Value *DestS = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
685 const Value *SrcS = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
687 SDValue Val = DAG.getLoad(getPointerTy(), dl, Chain, SrcP, SrcS, 0);
688 SDValue Result = DAG.getStore(Val.getValue(1), dl, Val, DestP, DestS, 0);
689 SDValue NP = DAG.getNode(ISD::ADD, dl, MVT::i64, SrcP,
690 DAG.getConstant(8, MVT::i64));
691 Val = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Result,
692 NP, NULL,0, MVT::i32);
693 SDValue NPD = DAG.getNode(ISD::ADD, dl, MVT::i64, DestP,
694 DAG.getConstant(8, MVT::i64));
695 return DAG.getTruncStore(Val.getValue(1), dl, Val, NPD, NULL, 0, MVT::i32);
698 SDValue Chain = Op.getOperand(0);
699 SDValue VAListP = Op.getOperand(1);
700 const Value *VAListS = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
702 // vastart stores the address of the VarArgsBase and VarArgsOffset
703 SDValue FR = DAG.getFrameIndex(VarArgsBase, MVT::i64);
704 SDValue S1 = DAG.getStore(Chain, dl, FR, VAListP, VAListS, 0);
705 SDValue SA2 = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
706 DAG.getConstant(8, MVT::i64));
707 return DAG.getTruncStore(S1, dl, DAG.getConstant(VarArgsOffset, MVT::i64),
708 SA2, NULL, 0, MVT::i32);
710 case ISD::RETURNADDR:
711 return DAG.getNode(AlphaISD::GlobalRetAddr, DebugLoc::getUnknownLoc(),
714 case ISD::FRAMEADDR: break;
720 void AlphaTargetLowering::ReplaceNodeResults(SDNode *N,
721 SmallVectorImpl<SDValue>&Results,
723 DebugLoc dl = N->getDebugLoc();
724 assert(N->getValueType(0) == MVT::i32 &&
725 N->getOpcode() == ISD::VAARG &&
726 "Unknown node to custom promote!");
728 SDValue Chain, DataPtr;
729 LowerVAARG(N, Chain, DataPtr, DAG);
730 SDValue Res = DAG.getLoad(N->getValueType(0), dl, Chain, DataPtr, NULL, 0);
731 Results.push_back(Res);
732 Results.push_back(SDValue(Res.getNode(), 1));
738 /// getConstraintType - Given a constraint letter, return the type of
739 /// constraint it is for this target.
740 AlphaTargetLowering::ConstraintType
741 AlphaTargetLowering::getConstraintType(const std::string &Constraint) const {
742 if (Constraint.size() == 1) {
743 switch (Constraint[0]) {
747 return C_RegisterClass;
750 return TargetLowering::getConstraintType(Constraint);
753 std::vector<unsigned> AlphaTargetLowering::
754 getRegClassForInlineAsmConstraint(const std::string &Constraint,
756 if (Constraint.size() == 1) {
757 switch (Constraint[0]) {
758 default: break; // Unknown constriant letter
760 return make_vector<unsigned>(Alpha::F0 , Alpha::F1 , Alpha::F2 ,
761 Alpha::F3 , Alpha::F4 , Alpha::F5 ,
762 Alpha::F6 , Alpha::F7 , Alpha::F8 ,
763 Alpha::F9 , Alpha::F10, Alpha::F11,
764 Alpha::F12, Alpha::F13, Alpha::F14,
765 Alpha::F15, Alpha::F16, Alpha::F17,
766 Alpha::F18, Alpha::F19, Alpha::F20,
767 Alpha::F21, Alpha::F22, Alpha::F23,
768 Alpha::F24, Alpha::F25, Alpha::F26,
769 Alpha::F27, Alpha::F28, Alpha::F29,
770 Alpha::F30, Alpha::F31, 0);
772 return make_vector<unsigned>(Alpha::R0 , Alpha::R1 , Alpha::R2 ,
773 Alpha::R3 , Alpha::R4 , Alpha::R5 ,
774 Alpha::R6 , Alpha::R7 , Alpha::R8 ,
775 Alpha::R9 , Alpha::R10, Alpha::R11,
776 Alpha::R12, Alpha::R13, Alpha::R14,
777 Alpha::R15, Alpha::R16, Alpha::R17,
778 Alpha::R18, Alpha::R19, Alpha::R20,
779 Alpha::R21, Alpha::R22, Alpha::R23,
780 Alpha::R24, Alpha::R25, Alpha::R26,
781 Alpha::R27, Alpha::R28, Alpha::R29,
782 Alpha::R30, Alpha::R31, 0);
786 return std::vector<unsigned>();
788 //===----------------------------------------------------------------------===//
789 // Other Lowering Code
790 //===----------------------------------------------------------------------===//
793 AlphaTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
794 MachineBasicBlock *BB) const {
795 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
796 assert((MI->getOpcode() == Alpha::CAS32 ||
797 MI->getOpcode() == Alpha::CAS64 ||
798 MI->getOpcode() == Alpha::LAS32 ||
799 MI->getOpcode() == Alpha::LAS64 ||
800 MI->getOpcode() == Alpha::SWAP32 ||
801 MI->getOpcode() == Alpha::SWAP64) &&
802 "Unexpected instr type to insert");
804 bool is32 = MI->getOpcode() == Alpha::CAS32 ||
805 MI->getOpcode() == Alpha::LAS32 ||
806 MI->getOpcode() == Alpha::SWAP32;
808 //Load locked store conditional for atomic ops take on the same form
811 //do stuff (maybe branch to exit)
813 //test sc and maybe branck to start
815 const BasicBlock *LLVM_BB = BB->getBasicBlock();
816 DebugLoc dl = MI->getDebugLoc();
817 MachineFunction::iterator It = BB;
820 MachineBasicBlock *thisMBB = BB;
821 MachineFunction *F = BB->getParent();
822 MachineBasicBlock *llscMBB = F->CreateMachineBasicBlock(LLVM_BB);
823 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
825 sinkMBB->transferSuccessors(thisMBB);
827 F->insert(It, llscMBB);
828 F->insert(It, sinkMBB);
830 BuildMI(thisMBB, dl, TII->get(Alpha::BR)).addMBB(llscMBB);
832 unsigned reg_res = MI->getOperand(0).getReg(),
833 reg_ptr = MI->getOperand(1).getReg(),
834 reg_v2 = MI->getOperand(2).getReg(),
835 reg_store = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
837 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::LDL_L : Alpha::LDQ_L),
838 reg_res).addImm(0).addReg(reg_ptr);
839 switch (MI->getOpcode()) {
843 = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
844 BuildMI(llscMBB, dl, TII->get(Alpha::CMPEQ), reg_cmp)
845 .addReg(reg_v2).addReg(reg_res);
846 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
847 .addImm(0).addReg(reg_cmp).addMBB(sinkMBB);
848 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
849 .addReg(Alpha::R31).addReg(MI->getOperand(3).getReg());
854 BuildMI(llscMBB, dl,TII->get(is32 ? Alpha::ADDLr : Alpha::ADDQr), reg_store)
855 .addReg(reg_res).addReg(reg_v2);
859 case Alpha::SWAP64: {
860 BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
861 .addReg(reg_v2).addReg(reg_v2);
865 BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::STL_C : Alpha::STQ_C), reg_store)
866 .addReg(reg_store).addImm(0).addReg(reg_ptr);
867 BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
868 .addImm(0).addReg(reg_store).addMBB(llscMBB);
869 BuildMI(llscMBB, dl, TII->get(Alpha::BR)).addMBB(sinkMBB);
871 thisMBB->addSuccessor(llscMBB);
872 llscMBB->addSuccessor(llscMBB);
873 llscMBB->addSuccessor(sinkMBB);
874 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
880 AlphaTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
881 // The Alpha target isn't yet aware of offsets.