2 // The LLVM Compiler Infrastructure
4 // This file is distributed under the University of Illinois Open Source
5 // License. See LICENSE.TXT for details.
7 //===----------------------------------------------------------------------===//
9 // This file defines the interfaces that PIC16 uses to lower LLVM code into a
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "pic16-lower"
15 #include "PIC16ABINames.h"
16 #include "PIC16ISelLowering.h"
17 #include "PIC16TargetObjectFile.h"
18 #include "PIC16TargetMachine.h"
19 #include "llvm/DerivedTypes.h"
20 #include "llvm/GlobalValue.h"
21 #include "llvm/Function.h"
22 #include "llvm/CallingConv.h"
23 #include "llvm/CodeGen/MachineFrameInfo.h"
24 #include "llvm/CodeGen/MachineFunction.h"
25 #include "llvm/CodeGen/MachineInstrBuilder.h"
26 #include "llvm/CodeGen/MachineRegisterInfo.h"
27 #include "llvm/Support/ErrorHandling.h"
32 static const char *getIntrinsicName(unsigned opcode) {
35 default: llvm_unreachable("do not know intrinsic name");
36 // Arithmetic Right shift for integer types.
37 case PIC16ISD::SRA_I8: Basename = "sra.i8"; break;
38 case RTLIB::SRA_I16: Basename = "sra.i16"; break;
39 case RTLIB::SRA_I32: Basename = "sra.i32"; break;
41 // Left shift for integer types.
42 case PIC16ISD::SLL_I8: Basename = "sll.i8"; break;
43 case RTLIB::SHL_I16: Basename = "sll.i16"; break;
44 case RTLIB::SHL_I32: Basename = "sll.i32"; break;
46 // Logical Right Shift for integer types.
47 case PIC16ISD::SRL_I8: Basename = "srl.i8"; break;
48 case RTLIB::SRL_I16: Basename = "srl.i16"; break;
49 case RTLIB::SRL_I32: Basename = "srl.i32"; break;
51 // Multiply for integer types.
52 case PIC16ISD::MUL_I8: Basename = "mul.i8"; break;
53 case RTLIB::MUL_I16: Basename = "mul.i16"; break;
54 case RTLIB::MUL_I32: Basename = "mul.i32"; break;
56 // Signed division for integers.
57 case RTLIB::SDIV_I16: Basename = "sdiv.i16"; break;
58 case RTLIB::SDIV_I32: Basename = "sdiv.i32"; break;
60 // Unsigned division for integers.
61 case RTLIB::UDIV_I16: Basename = "udiv.i16"; break;
62 case RTLIB::UDIV_I32: Basename = "udiv.i32"; break;
64 // Signed Modulas for integers.
65 case RTLIB::SREM_I16: Basename = "srem.i16"; break;
66 case RTLIB::SREM_I32: Basename = "srem.i32"; break;
68 // Unsigned Modulas for integers.
69 case RTLIB::UREM_I16: Basename = "urem.i16"; break;
70 case RTLIB::UREM_I32: Basename = "urem.i32"; break;
72 //////////////////////
73 // LIBCALLS FOR FLOATS
74 //////////////////////
76 // Float to signed integrals
77 case RTLIB::FPTOSINT_F32_I8: Basename = "f32_to_si32"; break;
78 case RTLIB::FPTOSINT_F32_I16: Basename = "f32_to_si32"; break;
79 case RTLIB::FPTOSINT_F32_I32: Basename = "f32_to_si32"; break;
81 // Signed integrals to float. char and int are first sign extended to i32
82 // before being converted to float, so an I8_F32 or I16_F32 isn't required.
83 case RTLIB::SINTTOFP_I32_F32: Basename = "si32_to_f32"; break;
85 // Float to Unsigned conversions.
86 // Signed conversion can be used for unsigned conversion as well.
87 // In signed and unsigned versions only the interpretation of the
88 // MSB is different. Bit representation remains the same.
89 case RTLIB::FPTOUINT_F32_I8: Basename = "f32_to_si32"; break;
90 case RTLIB::FPTOUINT_F32_I16: Basename = "f32_to_si32"; break;
91 case RTLIB::FPTOUINT_F32_I32: Basename = "f32_to_si32"; break;
93 // Unsigned to Float conversions. char and int are first zero extended
94 // before being converted to float.
95 case RTLIB::UINTTOFP_I32_F32: Basename = "ui32_to_f32"; break;
97 // Floating point add, sub, mul, div.
98 case RTLIB::ADD_F32: Basename = "add.f32"; break;
99 case RTLIB::SUB_F32: Basename = "sub.f32"; break;
100 case RTLIB::MUL_F32: Basename = "mul.f32"; break;
101 case RTLIB::DIV_F32: Basename = "div.f32"; break;
103 // Floating point comparison
104 case RTLIB::O_F32: Basename = "unordered.f32"; break;
105 case RTLIB::UO_F32: Basename = "unordered.f32"; break;
106 case RTLIB::OLE_F32: Basename = "le.f32"; break;
107 case RTLIB::OGE_F32: Basename = "ge.f32"; break;
108 case RTLIB::OLT_F32: Basename = "lt.f32"; break;
109 case RTLIB::OGT_F32: Basename = "gt.f32"; break;
110 case RTLIB::OEQ_F32: Basename = "eq.f32"; break;
111 case RTLIB::UNE_F32: Basename = "neq.f32"; break;
114 std::string prefix = PAN::getTagName(PAN::PREFIX_SYMBOL);
115 std::string tagname = PAN::getTagName(PAN::LIBCALL);
116 std::string Fullname = prefix + tagname + Basename;
118 // The name has to live through program life.
119 return createESName(Fullname);
122 // getStdLibCallName - Get the name for the standard library function.
123 static const char *getStdLibCallName(unsigned opcode) {
124 std::string BaseName;
126 case RTLIB::COS_F32: BaseName = "cos";
128 case RTLIB::SIN_F32: BaseName = "sin";
130 case RTLIB::MEMCPY: BaseName = "memcpy";
132 case RTLIB::MEMSET: BaseName = "memset";
134 case RTLIB::MEMMOVE: BaseName = "memmove";
136 default: llvm_unreachable("do not know std lib call name");
138 std::string prefix = PAN::getTagName(PAN::PREFIX_SYMBOL);
139 std::string LibCallName = prefix + BaseName;
141 // The name has to live through program life.
142 return createESName(LibCallName);
145 // PIC16TargetLowering Constructor.
146 PIC16TargetLowering::PIC16TargetLowering(PIC16TargetMachine &TM)
147 : TargetLowering(TM, new PIC16TargetObjectFile()), TmpSize(0) {
149 Subtarget = &TM.getSubtarget<PIC16Subtarget>();
151 addRegisterClass(MVT::i8, PIC16::GPRRegisterClass);
153 setShiftAmountType(MVT::i8);
155 // Std lib call names
156 setLibcallName(RTLIB::COS_F32, getStdLibCallName(RTLIB::COS_F32));
157 setLibcallName(RTLIB::SIN_F32, getStdLibCallName(RTLIB::SIN_F32));
158 setLibcallName(RTLIB::MEMCPY, getStdLibCallName(RTLIB::MEMCPY));
159 setLibcallName(RTLIB::MEMSET, getStdLibCallName(RTLIB::MEMSET));
160 setLibcallName(RTLIB::MEMMOVE, getStdLibCallName(RTLIB::MEMMOVE));
162 // SRA library call names
163 setPIC16LibcallName(PIC16ISD::SRA_I8, getIntrinsicName(PIC16ISD::SRA_I8));
164 setLibcallName(RTLIB::SRA_I16, getIntrinsicName(RTLIB::SRA_I16));
165 setLibcallName(RTLIB::SRA_I32, getIntrinsicName(RTLIB::SRA_I32));
167 // SHL library call names
168 setPIC16LibcallName(PIC16ISD::SLL_I8, getIntrinsicName(PIC16ISD::SLL_I8));
169 setLibcallName(RTLIB::SHL_I16, getIntrinsicName(RTLIB::SHL_I16));
170 setLibcallName(RTLIB::SHL_I32, getIntrinsicName(RTLIB::SHL_I32));
172 // SRL library call names
173 setPIC16LibcallName(PIC16ISD::SRL_I8, getIntrinsicName(PIC16ISD::SRL_I8));
174 setLibcallName(RTLIB::SRL_I16, getIntrinsicName(RTLIB::SRL_I16));
175 setLibcallName(RTLIB::SRL_I32, getIntrinsicName(RTLIB::SRL_I32));
177 // MUL Library call names
178 setPIC16LibcallName(PIC16ISD::MUL_I8, getIntrinsicName(PIC16ISD::MUL_I8));
179 setLibcallName(RTLIB::MUL_I16, getIntrinsicName(RTLIB::MUL_I16));
180 setLibcallName(RTLIB::MUL_I32, getIntrinsicName(RTLIB::MUL_I32));
182 // Signed division lib call names
183 setLibcallName(RTLIB::SDIV_I16, getIntrinsicName(RTLIB::SDIV_I16));
184 setLibcallName(RTLIB::SDIV_I32, getIntrinsicName(RTLIB::SDIV_I32));
186 // Unsigned division lib call names
187 setLibcallName(RTLIB::UDIV_I16, getIntrinsicName(RTLIB::UDIV_I16));
188 setLibcallName(RTLIB::UDIV_I32, getIntrinsicName(RTLIB::UDIV_I32));
190 // Signed remainder lib call names
191 setLibcallName(RTLIB::SREM_I16, getIntrinsicName(RTLIB::SREM_I16));
192 setLibcallName(RTLIB::SREM_I32, getIntrinsicName(RTLIB::SREM_I32));
194 // Unsigned remainder lib call names
195 setLibcallName(RTLIB::UREM_I16, getIntrinsicName(RTLIB::UREM_I16));
196 setLibcallName(RTLIB::UREM_I32, getIntrinsicName(RTLIB::UREM_I32));
198 // Floating point to signed int conversions.
199 setLibcallName(RTLIB::FPTOSINT_F32_I8,
200 getIntrinsicName(RTLIB::FPTOSINT_F32_I8));
201 setLibcallName(RTLIB::FPTOSINT_F32_I16,
202 getIntrinsicName(RTLIB::FPTOSINT_F32_I16));
203 setLibcallName(RTLIB::FPTOSINT_F32_I32,
204 getIntrinsicName(RTLIB::FPTOSINT_F32_I32));
206 // Signed int to floats.
207 setLibcallName(RTLIB::SINTTOFP_I32_F32,
208 getIntrinsicName(RTLIB::SINTTOFP_I32_F32));
210 // Floating points to unsigned ints.
211 setLibcallName(RTLIB::FPTOUINT_F32_I8,
212 getIntrinsicName(RTLIB::FPTOUINT_F32_I8));
213 setLibcallName(RTLIB::FPTOUINT_F32_I16,
214 getIntrinsicName(RTLIB::FPTOUINT_F32_I16));
215 setLibcallName(RTLIB::FPTOUINT_F32_I32,
216 getIntrinsicName(RTLIB::FPTOUINT_F32_I32));
218 // Unsigned int to floats.
219 setLibcallName(RTLIB::UINTTOFP_I32_F32,
220 getIntrinsicName(RTLIB::UINTTOFP_I32_F32));
222 // Floating point add, sub, mul ,div.
223 setLibcallName(RTLIB::ADD_F32, getIntrinsicName(RTLIB::ADD_F32));
224 setLibcallName(RTLIB::SUB_F32, getIntrinsicName(RTLIB::SUB_F32));
225 setLibcallName(RTLIB::MUL_F32, getIntrinsicName(RTLIB::MUL_F32));
226 setLibcallName(RTLIB::DIV_F32, getIntrinsicName(RTLIB::DIV_F32));
228 // Floationg point comparison
229 setLibcallName(RTLIB::O_F32, getIntrinsicName(RTLIB::O_F32));
230 setLibcallName(RTLIB::UO_F32, getIntrinsicName(RTLIB::UO_F32));
231 setLibcallName(RTLIB::OLE_F32, getIntrinsicName(RTLIB::OLE_F32));
232 setLibcallName(RTLIB::OGE_F32, getIntrinsicName(RTLIB::OGE_F32));
233 setLibcallName(RTLIB::OLT_F32, getIntrinsicName(RTLIB::OLT_F32));
234 setLibcallName(RTLIB::OGT_F32, getIntrinsicName(RTLIB::OGT_F32));
235 setLibcallName(RTLIB::OEQ_F32, getIntrinsicName(RTLIB::OEQ_F32));
236 setLibcallName(RTLIB::UNE_F32, getIntrinsicName(RTLIB::UNE_F32));
238 // Return value comparisons of floating point calls.
239 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
240 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
241 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
242 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
243 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
244 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
245 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
246 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
248 setOperationAction(ISD::GlobalAddress, MVT::i16, Custom);
249 setOperationAction(ISD::ExternalSymbol, MVT::i16, Custom);
251 setOperationAction(ISD::LOAD, MVT::i8, Legal);
252 setOperationAction(ISD::LOAD, MVT::i16, Custom);
253 setOperationAction(ISD::LOAD, MVT::i32, Custom);
255 setOperationAction(ISD::STORE, MVT::i8, Legal);
256 setOperationAction(ISD::STORE, MVT::i16, Custom);
257 setOperationAction(ISD::STORE, MVT::i32, Custom);
258 setOperationAction(ISD::STORE, MVT::i64, Custom);
260 setOperationAction(ISD::ADDE, MVT::i8, Custom);
261 setOperationAction(ISD::ADDC, MVT::i8, Custom);
262 setOperationAction(ISD::SUBE, MVT::i8, Custom);
263 setOperationAction(ISD::SUBC, MVT::i8, Custom);
264 setOperationAction(ISD::SUB, MVT::i8, Custom);
265 setOperationAction(ISD::ADD, MVT::i8, Custom);
266 setOperationAction(ISD::ADD, MVT::i16, Custom);
268 setOperationAction(ISD::OR, MVT::i8, Custom);
269 setOperationAction(ISD::AND, MVT::i8, Custom);
270 setOperationAction(ISD::XOR, MVT::i8, Custom);
272 setOperationAction(ISD::FrameIndex, MVT::i16, Custom);
274 setOperationAction(ISD::MUL, MVT::i8, Custom);
276 setOperationAction(ISD::SMUL_LOHI, MVT::i8, Expand);
277 setOperationAction(ISD::UMUL_LOHI, MVT::i8, Expand);
278 setOperationAction(ISD::MULHU, MVT::i8, Expand);
279 setOperationAction(ISD::MULHS, MVT::i8, Expand);
281 setOperationAction(ISD::SRA, MVT::i8, Custom);
282 setOperationAction(ISD::SHL, MVT::i8, Custom);
283 setOperationAction(ISD::SRL, MVT::i8, Custom);
285 setOperationAction(ISD::ROTL, MVT::i8, Expand);
286 setOperationAction(ISD::ROTR, MVT::i8, Expand);
288 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
290 // PIC16 does not support shift parts
291 setOperationAction(ISD::SRA_PARTS, MVT::i8, Expand);
292 setOperationAction(ISD::SHL_PARTS, MVT::i8, Expand);
293 setOperationAction(ISD::SRL_PARTS, MVT::i8, Expand);
296 // PIC16 does not have a SETCC, expand it to SELECT_CC.
297 setOperationAction(ISD::SETCC, MVT::i8, Expand);
298 setOperationAction(ISD::SELECT, MVT::i8, Expand);
299 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
300 setOperationAction(ISD::BRIND, MVT::Other, Expand);
302 setOperationAction(ISD::SELECT_CC, MVT::i8, Custom);
303 setOperationAction(ISD::BR_CC, MVT::i8, Custom);
305 //setOperationAction(ISD::TRUNCATE, MVT::i16, Custom);
306 setTruncStoreAction(MVT::i16, MVT::i8, Custom);
308 // Now deduce the information based on the above mentioned
310 computeRegisterProperties();
313 // getOutFlag - Extract the flag result if the Op has it.
314 static SDValue getOutFlag(SDValue &Op) {
315 // Flag is the last value of the node.
316 SDValue Flag = Op.getValue(Op.getNode()->getNumValues() - 1);
318 assert (Flag.getValueType() == MVT::Flag
319 && "Node does not have an out Flag");
323 // Get the TmpOffset for FrameIndex
324 unsigned PIC16TargetLowering::GetTmpOffsetForFI(unsigned FI, unsigned size) {
325 std::map<unsigned, unsigned>::iterator
326 MapIt = FiTmpOffsetMap.find(FI);
327 if (MapIt != FiTmpOffsetMap.end())
328 return MapIt->second;
330 // This FI (FrameIndex) is not yet mapped, so map it
331 FiTmpOffsetMap[FI] = TmpSize;
333 return FiTmpOffsetMap[FI];
336 // To extract chain value from the SDValue Nodes
337 // This function will help to maintain the chain extracting
338 // code at one place. In case of any change in future it will
339 // help maintain the code.
340 static SDValue getChain(SDValue &Op) {
341 SDValue Chain = Op.getValue(Op.getNode()->getNumValues() - 1);
343 // If the last value returned in Flag then the chain is
344 // second last value returned.
345 if (Chain.getValueType() == MVT::Flag)
346 Chain = Op.getValue(Op.getNode()->getNumValues() - 2);
348 // All nodes may not produce a chain. Therefore following assert
349 // verifies that the node is returning a chain only.
350 assert (Chain.getValueType() == MVT::Other
351 && "Node does not have a chain");
356 /// PopulateResults - Helper function to LowerOperation.
357 /// If a node wants to return multiple results after lowering,
358 /// it stuffs them into an array of SDValue called Results.
360 static void PopulateResults(SDValue N, SmallVectorImpl<SDValue>&Results) {
361 if (N.getOpcode() == ISD::MERGE_VALUES) {
362 int NumResults = N.getNumOperands();
363 for( int i = 0; i < NumResults; i++)
364 Results.push_back(N.getOperand(i));
367 Results.push_back(N);
371 PIC16TargetLowering::getSetCCResultType(EVT ValType) const {
376 PIC16TargetLowering::getCmpLibcallReturnType() const {
380 /// The type legalizer framework of generating legalizer can generate libcalls
381 /// only when the operand/result types are illegal.
382 /// PIC16 needs to generate libcalls even for the legal types (i8) for some ops.
383 /// For example an arithmetic right shift. These functions are used to lower
384 /// such operations that generate libcall for legal types.
387 PIC16TargetLowering::setPIC16LibcallName(PIC16ISD::PIC16Libcall Call,
389 PIC16LibcallNames[Call] = Name;
393 PIC16TargetLowering::getPIC16LibcallName(PIC16ISD::PIC16Libcall Call) {
394 return PIC16LibcallNames[Call];
398 PIC16TargetLowering::MakePIC16Libcall(PIC16ISD::PIC16Libcall Call,
399 EVT RetVT, const SDValue *Ops,
400 unsigned NumOps, bool isSigned,
401 SelectionDAG &DAG, DebugLoc dl) {
403 TargetLowering::ArgListTy Args;
404 Args.reserve(NumOps);
406 TargetLowering::ArgListEntry Entry;
407 for (unsigned i = 0; i != NumOps; ++i) {
409 Entry.Ty = Entry.Node.getValueType().getTypeForEVT(*DAG.getContext());
410 Entry.isSExt = isSigned;
411 Entry.isZExt = !isSigned;
412 Args.push_back(Entry);
415 SDValue Callee = DAG.getExternalSymbol(getPIC16LibcallName(Call), MVT::i16);
417 const Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
418 std::pair<SDValue,SDValue> CallInfo =
419 LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
420 false, 0, CallingConv::C, false,
421 /*isReturnValueUsed=*/true,
422 Callee, Args, DAG, dl,
423 DAG.GetOrdering(DAG.getEntryNode().getNode()));
425 return CallInfo.first;
428 const char *PIC16TargetLowering::getTargetNodeName(unsigned Opcode) const {
430 default: return NULL;
431 case PIC16ISD::Lo: return "PIC16ISD::Lo";
432 case PIC16ISD::Hi: return "PIC16ISD::Hi";
433 case PIC16ISD::MTLO: return "PIC16ISD::MTLO";
434 case PIC16ISD::MTHI: return "PIC16ISD::MTHI";
435 case PIC16ISD::MTPCLATH: return "PIC16ISD::MTPCLATH";
436 case PIC16ISD::PIC16Connect: return "PIC16ISD::PIC16Connect";
437 case PIC16ISD::Banksel: return "PIC16ISD::Banksel";
438 case PIC16ISD::PIC16Load: return "PIC16ISD::PIC16Load";
439 case PIC16ISD::PIC16LdArg: return "PIC16ISD::PIC16LdArg";
440 case PIC16ISD::PIC16LdWF: return "PIC16ISD::PIC16LdWF";
441 case PIC16ISD::PIC16Store: return "PIC16ISD::PIC16Store";
442 case PIC16ISD::PIC16StWF: return "PIC16ISD::PIC16StWF";
443 case PIC16ISD::BCF: return "PIC16ISD::BCF";
444 case PIC16ISD::LSLF: return "PIC16ISD::LSLF";
445 case PIC16ISD::LRLF: return "PIC16ISD::LRLF";
446 case PIC16ISD::RLF: return "PIC16ISD::RLF";
447 case PIC16ISD::RRF: return "PIC16ISD::RRF";
448 case PIC16ISD::CALL: return "PIC16ISD::CALL";
449 case PIC16ISD::CALLW: return "PIC16ISD::CALLW";
450 case PIC16ISD::SUBCC: return "PIC16ISD::SUBCC";
451 case PIC16ISD::SELECT_ICC: return "PIC16ISD::SELECT_ICC";
452 case PIC16ISD::BRCOND: return "PIC16ISD::BRCOND";
453 case PIC16ISD::RET: return "PIC16ISD::RET";
454 case PIC16ISD::Dummy: return "PIC16ISD::Dummy";
458 void PIC16TargetLowering::ReplaceNodeResults(SDNode *N,
459 SmallVectorImpl<SDValue>&Results,
462 switch (N->getOpcode()) {
463 case ISD::GlobalAddress:
464 Results.push_back(ExpandGlobalAddress(N, DAG));
466 case ISD::ExternalSymbol:
467 Results.push_back(ExpandExternalSymbol(N, DAG));
470 Results.push_back(ExpandStore(N, DAG));
473 PopulateResults(ExpandLoad(N, DAG), Results);
476 // Results.push_back(ExpandAdd(N, DAG));
478 case ISD::FrameIndex:
479 Results.push_back(ExpandFrameIndex(N, DAG));
482 assert (0 && "not implemented");
487 SDValue PIC16TargetLowering::ExpandFrameIndex(SDNode *N, SelectionDAG &DAG) {
489 // Currently handling FrameIndex of size MVT::i16 only
490 // One example of this scenario is when return value is written on
493 if (N->getValueType(0) != MVT::i16)
496 // Expand the FrameIndex into ExternalSymbol and a Constant node
497 // The constant will represent the frame index number
498 // Get the current function frame
499 MachineFunction &MF = DAG.getMachineFunction();
500 const Function *Func = MF.getFunction();
501 const std::string Name = Func->getName();
503 FrameIndexSDNode *FR = dyn_cast<FrameIndexSDNode>(SDValue(N,0));
504 // FIXME there isn't really debug info here
505 DebugLoc dl = FR->getDebugLoc();
507 // Expand FrameIndex like GlobalAddress and ExternalSymbol
508 // Also use Offset field for lo and hi parts. The default
513 SDValue FI = SDValue(N,0);
514 LegalizeFrameIndex(FI, DAG, ES, FrameOffset);
515 SDValue Offset = DAG.getConstant(FrameOffset, MVT::i8);
516 SDValue Lo = DAG.getNode(PIC16ISD::Lo, dl, MVT::i8, ES, Offset);
517 SDValue Hi = DAG.getNode(PIC16ISD::Hi, dl, MVT::i8, ES, Offset);
518 return DAG.getNode(ISD::BUILD_PAIR, dl, N->getValueType(0), Lo, Hi);
522 SDValue PIC16TargetLowering::ExpandStore(SDNode *N, SelectionDAG &DAG) {
523 StoreSDNode *St = cast<StoreSDNode>(N);
524 SDValue Chain = St->getChain();
525 SDValue Src = St->getValue();
526 SDValue Ptr = St->getBasePtr();
527 EVT ValueType = Src.getValueType();
528 unsigned StoreOffset = 0;
529 DebugLoc dl = N->getDebugLoc();
531 SDValue PtrLo, PtrHi;
532 LegalizeAddress(Ptr, DAG, PtrLo, PtrHi, StoreOffset, dl);
534 if (ValueType == MVT::i8) {
535 return DAG.getNode (PIC16ISD::PIC16Store, dl, MVT::Other, Chain, Src,
537 DAG.getConstant (0 + StoreOffset, MVT::i8));
539 else if (ValueType == MVT::i16) {
540 // Get the Lo and Hi parts from MERGE_VALUE or BUILD_PAIR.
541 SDValue SrcLo, SrcHi;
542 GetExpandedParts(Src, DAG, SrcLo, SrcHi);
543 SDValue ChainLo = Chain, ChainHi = Chain;
544 // FIXME: This makes unsafe assumptions. The Chain may be a TokenFactor
545 // created for an unrelated purpose, in which case it may not have
546 // exactly two operands. Also, even if it does have two operands, they
547 // may not be the low and high parts of an aligned load that was split.
548 if (Chain.getOpcode() == ISD::TokenFactor) {
549 ChainLo = Chain.getOperand(0);
550 ChainHi = Chain.getOperand(1);
552 SDValue Store1 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other,
555 DAG.getConstant (0 + StoreOffset, MVT::i8));
557 SDValue Store2 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other, ChainHi,
559 DAG.getConstant (1 + StoreOffset, MVT::i8));
561 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, getChain(Store1),
564 else if (ValueType == MVT::i32) {
565 // Get the Lo and Hi parts from MERGE_VALUE or BUILD_PAIR.
566 SDValue SrcLo, SrcHi;
567 GetExpandedParts(Src, DAG, SrcLo, SrcHi);
569 // Get the expanded parts of each of SrcLo and SrcHi.
570 SDValue SrcLo1, SrcLo2, SrcHi1, SrcHi2;
571 GetExpandedParts(SrcLo, DAG, SrcLo1, SrcLo2);
572 GetExpandedParts(SrcHi, DAG, SrcHi1, SrcHi2);
574 SDValue ChainLo = Chain, ChainHi = Chain;
575 // FIXME: This makes unsafe assumptions; see the FIXME above.
576 if (Chain.getOpcode() == ISD::TokenFactor) {
577 ChainLo = Chain.getOperand(0);
578 ChainHi = Chain.getOperand(1);
580 SDValue ChainLo1 = ChainLo, ChainLo2 = ChainLo, ChainHi1 = ChainHi,
582 // FIXME: This makes unsafe assumptions; see the FIXME above.
583 if (ChainLo.getOpcode() == ISD::TokenFactor) {
584 ChainLo1 = ChainLo.getOperand(0);
585 ChainLo2 = ChainLo.getOperand(1);
587 // FIXME: This makes unsafe assumptions; see the FIXME above.
588 if (ChainHi.getOpcode() == ISD::TokenFactor) {
589 ChainHi1 = ChainHi.getOperand(0);
590 ChainHi2 = ChainHi.getOperand(1);
592 SDValue Store1 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other,
594 SrcLo1, PtrLo, PtrHi,
595 DAG.getConstant (0 + StoreOffset, MVT::i8));
597 SDValue Store2 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other, ChainLo2,
598 SrcLo2, PtrLo, PtrHi,
599 DAG.getConstant (1 + StoreOffset, MVT::i8));
601 SDValue Store3 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other, ChainHi1,
602 SrcHi1, PtrLo, PtrHi,
603 DAG.getConstant (2 + StoreOffset, MVT::i8));
605 SDValue Store4 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other, ChainHi2,
606 SrcHi2, PtrLo, PtrHi,
607 DAG.getConstant (3 + StoreOffset, MVT::i8));
609 SDValue RetLo = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
610 getChain(Store1), getChain(Store2));
611 SDValue RetHi = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
612 getChain(Store3), getChain(Store4));
613 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, RetLo, RetHi);
615 } else if (ValueType == MVT::i64) {
616 SDValue SrcLo, SrcHi;
617 GetExpandedParts(Src, DAG, SrcLo, SrcHi);
618 SDValue ChainLo = Chain, ChainHi = Chain;
619 // FIXME: This makes unsafe assumptions; see the FIXME above.
620 if (Chain.getOpcode() == ISD::TokenFactor) {
621 ChainLo = Chain.getOperand(0);
622 ChainHi = Chain.getOperand(1);
624 SDValue Store1 = DAG.getStore(ChainLo, dl, SrcLo, Ptr, NULL,
625 0 + StoreOffset, false, false, 0);
627 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
628 DAG.getConstant(4, Ptr.getValueType()));
629 SDValue Store2 = DAG.getStore(ChainHi, dl, SrcHi, Ptr, NULL,
630 1 + StoreOffset, false, false, 0);
632 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Store1,
635 assert (0 && "value type not supported");
640 SDValue PIC16TargetLowering::ExpandExternalSymbol(SDNode *N, SelectionDAG &DAG)
642 ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(SDValue(N, 0));
643 // FIXME there isn't really debug info here
644 DebugLoc dl = ES->getDebugLoc();
646 SDValue TES = DAG.getTargetExternalSymbol(ES->getSymbol(), MVT::i8);
647 SDValue Offset = DAG.getConstant(0, MVT::i8);
648 SDValue Lo = DAG.getNode(PIC16ISD::Lo, dl, MVT::i8, TES, Offset);
649 SDValue Hi = DAG.getNode(PIC16ISD::Hi, dl, MVT::i8, TES, Offset);
651 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i16, Lo, Hi);
654 // ExpandGlobalAddress -
655 SDValue PIC16TargetLowering::ExpandGlobalAddress(SDNode *N, SelectionDAG &DAG) {
656 GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(SDValue(N, 0));
657 // FIXME there isn't really debug info here
658 DebugLoc dl = G->getDebugLoc();
660 SDValue TGA = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i8,
663 SDValue Offset = DAG.getConstant(0, MVT::i8);
664 SDValue Lo = DAG.getNode(PIC16ISD::Lo, dl, MVT::i8, TGA, Offset);
665 SDValue Hi = DAG.getNode(PIC16ISD::Hi, dl, MVT::i8, TGA, Offset);
667 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i16, Lo, Hi);
670 bool PIC16TargetLowering::isDirectAddress(const SDValue &Op) {
671 assert (Op.getNode() != NULL && "Can't operate on NULL SDNode!!");
673 if (Op.getOpcode() == ISD::BUILD_PAIR) {
674 if (Op.getOperand(0).getOpcode() == PIC16ISD::Lo)
680 // Return true if DirectAddress is in ROM_SPACE
681 bool PIC16TargetLowering::isRomAddress(const SDValue &Op) {
683 // RomAddress is a GlobalAddress in ROM_SPACE_
684 // If the Op is not a GlobalAddress return NULL without checking
686 if (!isDirectAddress(Op))
689 // Its a GlobalAddress.
690 // It is BUILD_PAIR((PIC16Lo TGA), (PIC16Hi TGA)) and Op is BUILD_PAIR
691 SDValue TGA = Op.getOperand(0).getOperand(0);
692 GlobalAddressSDNode *GSDN = dyn_cast<GlobalAddressSDNode>(TGA);
694 if (GSDN->getAddressSpace() == PIC16ISD::ROM_SPACE)
697 // Any other address space return it false
702 // GetExpandedParts - This function is on the similiar lines as
703 // the GetExpandedInteger in type legalizer is. This returns expanded
704 // parts of Op in Lo and Hi.
706 void PIC16TargetLowering::GetExpandedParts(SDValue Op, SelectionDAG &DAG,
707 SDValue &Lo, SDValue &Hi) {
708 SDNode *N = Op.getNode();
709 DebugLoc dl = N->getDebugLoc();
710 EVT NewVT = getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
712 // Extract the lo component.
713 Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, NewVT, Op,
714 DAG.getConstant(0, MVT::i8));
716 // extract the hi component
717 Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, NewVT, Op,
718 DAG.getConstant(1, MVT::i8));
721 // Legalize FrameIndex into ExternalSymbol and offset.
723 PIC16TargetLowering::LegalizeFrameIndex(SDValue Op, SelectionDAG &DAG,
724 SDValue &ES, int &Offset) {
726 MachineFunction &MF = DAG.getMachineFunction();
727 const Function *Func = MF.getFunction();
728 MachineFrameInfo *MFI = MF.getFrameInfo();
729 const std::string Name = Func->getName();
731 FrameIndexSDNode *FR = dyn_cast<FrameIndexSDNode>(Op);
733 // FrameIndices are not stack offsets. But they represent the request
734 // for space on stack. That space requested may be more than one byte.
735 // Therefore, to calculate the stack offset that a FrameIndex aligns
736 // with, we need to traverse all the FrameIndices available earlier in
737 // the list and add their requested size.
738 unsigned FIndex = FR->getIndex();
740 if (FIndex < ReservedFrameCount) {
741 tmpName = createESName(PAN::getFrameLabel(Name));
742 ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
744 for (unsigned i=0; i<FIndex ; ++i) {
745 Offset += MFI->getObjectSize(i);
748 // FrameIndex has been made for some temporary storage
749 tmpName = createESName(PAN::getTempdataLabel(Name));
750 ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
751 Offset = GetTmpOffsetForFI(FIndex, MFI->getObjectSize(FIndex));
757 // This function legalizes the PIC16 Addresses. If the Pointer is
758 // -- Direct address variable residing
759 // --> then a Banksel for that variable will be created.
761 // --> then it will be treated as an indirect address.
762 // -- Indirect address
763 // --> then the address will be loaded into FSR
764 // -- ADD with constant operand
765 // --> then constant operand of ADD will be returned as Offset
766 // and non-constant operand of ADD will be treated as pointer.
767 // Returns the high and lo part of the address, and the offset(in case of ADD).
769 void PIC16TargetLowering::LegalizeAddress(SDValue Ptr, SelectionDAG &DAG,
770 SDValue &Lo, SDValue &Hi,
771 unsigned &Offset, DebugLoc dl) {
773 // Offset, by default, should be 0
776 // If the pointer is ADD with constant,
777 // return the constant value as the offset
778 if (Ptr.getOpcode() == ISD::ADD) {
779 SDValue OperLeft = Ptr.getOperand(0);
780 SDValue OperRight = Ptr.getOperand(1);
781 if ((OperLeft.getOpcode() == ISD::Constant) &&
782 (dyn_cast<ConstantSDNode>(OperLeft)->getZExtValue() < 32 )) {
783 Offset = dyn_cast<ConstantSDNode>(OperLeft)->getZExtValue();
785 } else if ((OperRight.getOpcode() == ISD::Constant) &&
786 (dyn_cast<ConstantSDNode>(OperRight)->getZExtValue() < 32 )){
787 Offset = dyn_cast<ConstantSDNode>(OperRight)->getZExtValue();
792 // If the pointer is Type i8 and an external symbol
793 // then treat it as direct address.
794 // One example for such case is storing and loading
795 // from function frame during a call
796 if (Ptr.getValueType() == MVT::i8) {
797 switch (Ptr.getOpcode()) {
798 case ISD::TargetExternalSymbol:
800 Hi = DAG.getConstant(1, MVT::i8);
805 // Expansion of FrameIndex has Lo/Hi parts
806 if (isDirectAddress(Ptr)) {
807 SDValue TFI = Ptr.getOperand(0).getOperand(0);
809 if (TFI.getOpcode() == ISD::TargetFrameIndex) {
810 LegalizeFrameIndex(TFI, DAG, Lo, FrameOffset);
811 Hi = DAG.getConstant(1, MVT::i8);
812 Offset += FrameOffset;
814 } else if (TFI.getOpcode() == ISD::TargetExternalSymbol) {
815 // FrameIndex has already been expanded.
816 // Now just make use of its expansion
818 Hi = DAG.getConstant(1, MVT::i8);
819 SDValue FOffset = Ptr.getOperand(0).getOperand(1);
820 assert (FOffset.getOpcode() == ISD::Constant &&
821 "Invalid operand of PIC16ISD::Lo");
822 Offset += dyn_cast<ConstantSDNode>(FOffset)->getZExtValue();
827 if (isDirectAddress(Ptr) && !isRomAddress(Ptr)) {
828 // Direct addressing case for RAM variables. The Hi part is constant
829 // and the Lo part is the TGA itself.
830 Lo = Ptr.getOperand(0).getOperand(0);
832 // For direct addresses Hi is a constant. Value 1 for the constant
833 // signifies that banksel needs to generated for it. Value 0 for
834 // the constant signifies that banksel does not need to be generated
835 // for it. Mark it as 1 now and optimize later.
836 Hi = DAG.getConstant(1, MVT::i8);
840 // Indirect addresses. Get the hi and lo parts of ptr.
841 GetExpandedParts(Ptr, DAG, Lo, Hi);
843 // Put the hi and lo parts into FSR.
844 Lo = DAG.getNode(PIC16ISD::MTLO, dl, MVT::i8, Lo);
845 Hi = DAG.getNode(PIC16ISD::MTHI, dl, MVT::i8, Hi);
850 SDValue PIC16TargetLowering::ExpandLoad(SDNode *N, SelectionDAG &DAG) {
851 LoadSDNode *LD = dyn_cast<LoadSDNode>(SDValue(N, 0));
852 SDValue Chain = LD->getChain();
853 SDValue Ptr = LD->getBasePtr();
854 DebugLoc dl = LD->getDebugLoc();
856 SDValue Load, Offset;
859 SDValue PtrLo, PtrHi;
862 // Legalize direct/indirect addresses. This will give the lo and hi parts
863 // of the address and the offset.
864 LegalizeAddress(Ptr, DAG, PtrLo, PtrHi, LoadOffset, dl);
866 // Load from the pointer (direct address or FSR)
867 VT = N->getValueType(0);
868 unsigned NumLoads = VT.getSizeInBits() / 8;
869 std::vector<SDValue> PICLoads;
871 EVT MemVT = LD->getMemoryVT();
872 if(ISD::isNON_EXTLoad(N)) {
873 for (iter=0; iter<NumLoads ; ++iter) {
874 // Add the pointer offset if any
875 Offset = DAG.getConstant(iter + LoadOffset, MVT::i8);
876 Tys = DAG.getVTList(MVT::i8, MVT::Other);
877 Load = DAG.getNode(PIC16ISD::PIC16Load, dl, Tys, Chain, PtrLo, PtrHi,
879 PICLoads.push_back(Load);
882 // If it is extended load then use PIC16Load for Memory Bytes
883 // and for all extended bytes perform action based on type of
884 // extention - i.e. SignExtendedLoad or ZeroExtendedLoad
887 // For extended loads this is the memory value type
888 // i.e. without any extension
889 EVT MemVT = LD->getMemoryVT();
890 unsigned MemBytes = MemVT.getSizeInBits() / 8;
891 // if MVT::i1 is extended to MVT::i8 then MemBytes will be zero
893 if (MemBytes == 0) MemBytes = 1;
895 unsigned ExtdBytes = VT.getSizeInBits() / 8;
896 Offset = DAG.getConstant(LoadOffset, MVT::i8);
898 Tys = DAG.getVTList(MVT::i8, MVT::Other);
899 // For MemBytes generate PIC16Load with proper offset
900 for (iter=0; iter < MemBytes; ++iter) {
901 // Add the pointer offset if any
902 Offset = DAG.getConstant(iter + LoadOffset, MVT::i8);
903 Load = DAG.getNode(PIC16ISD::PIC16Load, dl, Tys, Chain, PtrLo, PtrHi,
905 PICLoads.push_back(Load);
908 // For SignExtendedLoad
909 if (ISD::isSEXTLoad(N)) {
910 // For all ExtdBytes use the Right Shifted(Arithmetic) Value of the
912 SDValue SRA = DAG.getNode(ISD::SRA, dl, MVT::i8, Load,
913 DAG.getConstant(7, MVT::i8));
914 for (iter=MemBytes; iter<ExtdBytes; ++iter) {
915 PICLoads.push_back(SRA);
917 } else if (ISD::isZEXTLoad(N) || ISD::isEXTLoad(N)) {
918 //} else if (ISD::isZEXTLoad(N)) {
919 // ZeroExtendedLoad -- For all ExtdBytes use constant 0
920 SDValue ConstZero = DAG.getConstant(0, MVT::i8);
921 for (iter=MemBytes; iter<ExtdBytes; ++iter) {
922 PICLoads.push_back(ConstZero);
929 // Operand of Load is illegal -- Load itself is legal
932 else if (VT == MVT::i16) {
933 BP = DAG.getNode(ISD::BUILD_PAIR, dl, VT, PICLoads[0], PICLoads[1]);
934 if ((MemVT == MVT::i8) || (MemVT == MVT::i1))
935 Chain = getChain(PICLoads[0]);
937 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
938 getChain(PICLoads[0]), getChain(PICLoads[1]));
939 } else if (VT == MVT::i32) {
941 BPs[0] = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i16,
942 PICLoads[0], PICLoads[1]);
943 BPs[1] = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i16,
944 PICLoads[2], PICLoads[3]);
945 BP = DAG.getNode(ISD::BUILD_PAIR, dl, VT, BPs[0], BPs[1]);
946 if ((MemVT == MVT::i8) || (MemVT == MVT::i1))
947 Chain = getChain(PICLoads[0]);
948 else if (MemVT == MVT::i16)
949 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
950 getChain(PICLoads[0]), getChain(PICLoads[1]));
953 Chains[0] = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
954 getChain(PICLoads[0]), getChain(PICLoads[1]));
955 Chains[1] = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
956 getChain(PICLoads[2]), getChain(PICLoads[3]));
957 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
958 Chains[0], Chains[1]);
961 Tys = DAG.getVTList(VT, MVT::Other);
962 return DAG.getNode(ISD::MERGE_VALUES, dl, Tys, BP, Chain);
965 SDValue PIC16TargetLowering::LowerShift(SDValue Op, SelectionDAG &DAG) {
966 // We should have handled larger operands in type legalizer itself.
967 assert (Op.getValueType() == MVT::i8 && "illegal shift to lower");
969 SDNode *N = Op.getNode();
970 SDValue Value = N->getOperand(0);
971 SDValue Amt = N->getOperand(1);
972 PIC16ISD::PIC16Libcall CallCode;
973 switch (N->getOpcode()) {
975 CallCode = PIC16ISD::SRA_I8;
978 CallCode = PIC16ISD::SLL_I8;
981 CallCode = PIC16ISD::SRL_I8;
984 assert ( 0 && "This shift is not implemented yet.");
987 SmallVector<SDValue, 2> Ops(2);
990 SDValue Call = MakePIC16Libcall(CallCode, N->getValueType(0), &Ops[0], 2,
991 true, DAG, N->getDebugLoc());
995 SDValue PIC16TargetLowering::LowerMUL(SDValue Op, SelectionDAG &DAG) {
996 // We should have handled larger operands in type legalizer itself.
997 assert (Op.getValueType() == MVT::i8 && "illegal multiply to lower");
999 SDNode *N = Op.getNode();
1000 SmallVector<SDValue, 2> Ops(2);
1001 Ops[0] = N->getOperand(0);
1002 Ops[1] = N->getOperand(1);
1003 SDValue Call = MakePIC16Libcall(PIC16ISD::MUL_I8, N->getValueType(0),
1004 &Ops[0], 2, true, DAG, N->getDebugLoc());
1009 PIC16TargetLowering::LowerOperationWrapper(SDNode *N,
1010 SmallVectorImpl<SDValue>&Results,
1011 SelectionDAG &DAG) {
1012 SDValue Op = SDValue(N, 0);
1015 switch (Op.getOpcode()) {
1017 Res = ExpandLoad(Op.getNode(), DAG); break;
1019 // All other operations are handled in LowerOperation.
1020 Res = LowerOperation(Op, DAG);
1022 Results.push_back(Res);
1029 unsigned NumValues = N->getNumValues();
1030 for (i = 0; i < NumValues ; i++) {
1031 Results.push_back(SDValue(N, i));
1035 SDValue PIC16TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
1036 switch (Op.getOpcode()) {
1040 return LowerADD(Op, DAG);
1044 return LowerSUB(Op, DAG);
1046 return ExpandLoad(Op.getNode(), DAG);
1048 return ExpandStore(Op.getNode(), DAG);
1050 return LowerMUL(Op, DAG);
1054 return LowerShift(Op, DAG);
1058 return LowerBinOp(Op, DAG);
1060 return LowerBR_CC(Op, DAG);
1061 case ISD::SELECT_CC:
1062 return LowerSELECT_CC(Op, DAG);
1067 SDValue PIC16TargetLowering::ConvertToMemOperand(SDValue Op,
1070 assert (Op.getValueType() == MVT::i8
1071 && "illegal value type to store on stack.");
1073 MachineFunction &MF = DAG.getMachineFunction();
1074 const Function *Func = MF.getFunction();
1075 const std::string FuncName = Func->getName();
1078 // Put the value on stack.
1079 // Get a stack slot index and convert to es.
1080 int FI = MF.getFrameInfo()->CreateStackObject(1, 1, false);
1081 const char *tmpName = createESName(PAN::getTempdataLabel(FuncName));
1082 SDValue ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
1084 // Store the value to ES.
1085 SDValue Store = DAG.getNode (PIC16ISD::PIC16Store, dl, MVT::Other,
1088 DAG.getConstant (1, MVT::i8), // Banksel.
1089 DAG.getConstant (GetTmpOffsetForFI(FI, 1),
1092 // Load the value from ES.
1093 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other);
1094 SDValue Load = DAG.getNode(PIC16ISD::PIC16Load, dl, Tys, Store,
1095 ES, DAG.getConstant (1, MVT::i8),
1096 DAG.getConstant (GetTmpOffsetForFI(FI, 1),
1099 return Load.getValue(0);
1102 SDValue PIC16TargetLowering::
1103 LowerIndirectCallArguments(SDValue Chain, SDValue InFlag,
1104 SDValue DataAddr_Lo, SDValue DataAddr_Hi,
1105 const SmallVectorImpl<ISD::OutputArg> &Outs,
1106 const SmallVectorImpl<ISD::InputArg> &Ins,
1107 DebugLoc dl, SelectionDAG &DAG) {
1108 unsigned NumOps = Outs.size();
1110 // If call has no arguments then do nothing and return.
1114 std::vector<SDValue> Ops;
1115 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Flag);
1116 SDValue Arg, StoreRet;
1118 // For PIC16 ABI the arguments come after the return value.
1119 unsigned RetVals = Ins.size();
1120 for (unsigned i = 0, ArgOffset = RetVals; i < NumOps; i++) {
1121 // Get the arguments
1125 Ops.push_back(Chain);
1127 Ops.push_back(DataAddr_Lo);
1128 Ops.push_back(DataAddr_Hi);
1129 Ops.push_back(DAG.getConstant(ArgOffset, MVT::i8));
1130 Ops.push_back(InFlag);
1132 StoreRet = DAG.getNode (PIC16ISD::PIC16StWF, dl, Tys, &Ops[0], Ops.size());
1134 Chain = getChain(StoreRet);
1135 InFlag = getOutFlag(StoreRet);
1141 SDValue PIC16TargetLowering::
1142 LowerDirectCallArguments(SDValue ArgLabel, SDValue Chain, SDValue InFlag,
1143 const SmallVectorImpl<ISD::OutputArg> &Outs,
1144 DebugLoc dl, SelectionDAG &DAG) {
1145 unsigned NumOps = Outs.size();
1147 SDValue Arg, StoreAt;
1151 // If call has no arguments then do nothing and return.
1155 // FIXME: This portion of code currently assumes only
1156 // primitive types being passed as arguments.
1158 // Legalize the address before use
1159 SDValue PtrLo, PtrHi;
1160 unsigned AddressOffset;
1161 int StoreOffset = 0;
1162 LegalizeAddress(ArgLabel, DAG, PtrLo, PtrHi, AddressOffset, dl);
1165 std::vector<SDValue> Ops;
1166 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Flag);
1167 for (unsigned i=0, Offset = 0; i<NumOps; i++) {
1170 StoreOffset = (Offset + AddressOffset);
1172 // Store the argument on frame
1175 Ops.push_back(Chain);
1177 Ops.push_back(PtrLo);
1178 Ops.push_back(PtrHi);
1179 Ops.push_back(DAG.getConstant(StoreOffset, MVT::i8));
1180 Ops.push_back(InFlag);
1182 StoreRet = DAG.getNode (PIC16ISD::PIC16StWF, dl, Tys, &Ops[0], Ops.size());
1184 Chain = getChain(StoreRet);
1185 InFlag = getOutFlag(StoreRet);
1187 // Update the frame offset to be used for next argument
1188 ArgVT = Arg.getValueType();
1189 Size = ArgVT.getSizeInBits();
1190 Size = Size/8; // Calculate size in bytes
1191 Offset += Size; // Increase the frame offset
1196 SDValue PIC16TargetLowering::
1197 LowerIndirectCallReturn(SDValue Chain, SDValue InFlag,
1198 SDValue DataAddr_Lo, SDValue DataAddr_Hi,
1199 const SmallVectorImpl<ISD::InputArg> &Ins,
1200 DebugLoc dl, SelectionDAG &DAG,
1201 SmallVectorImpl<SDValue> &InVals) {
1202 unsigned RetVals = Ins.size();
1204 // If call does not have anything to return
1205 // then do nothing and go back.
1209 // Call has something to return
1212 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other, MVT::Flag);
1213 for(unsigned i=0;i<RetVals;i++) {
1214 LoadRet = DAG.getNode(PIC16ISD::PIC16LdWF, dl, Tys, Chain, DataAddr_Lo,
1215 DataAddr_Hi, DAG.getConstant(i, MVT::i8),
1217 InFlag = getOutFlag(LoadRet);
1218 Chain = getChain(LoadRet);
1219 InVals.push_back(LoadRet);
1224 SDValue PIC16TargetLowering::
1225 LowerDirectCallReturn(SDValue RetLabel, SDValue Chain, SDValue InFlag,
1226 const SmallVectorImpl<ISD::InputArg> &Ins,
1227 DebugLoc dl, SelectionDAG &DAG,
1228 SmallVectorImpl<SDValue> &InVals) {
1230 // Currently handling primitive types only. They will come in
1232 unsigned RetVals = Ins.size();
1234 // Return immediately if the return type is void
1238 // Call has something to return
1240 // Legalize the address before use
1243 LegalizeAddress(RetLabel, DAG, LdLo, LdHi, LdOffset, dl);
1245 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other, MVT::Flag);
1248 for(unsigned i=0, Offset=0;i<RetVals;i++) {
1250 LoadRet = DAG.getNode(PIC16ISD::PIC16LdWF, dl, Tys, Chain, LdLo, LdHi,
1251 DAG.getConstant(LdOffset + Offset, MVT::i8),
1254 InFlag = getOutFlag(LoadRet);
1256 Chain = getChain(LoadRet);
1258 InVals.push_back(LoadRet);
1265 PIC16TargetLowering::LowerReturn(SDValue Chain,
1266 CallingConv::ID CallConv, bool isVarArg,
1267 const SmallVectorImpl<ISD::OutputArg> &Outs,
1268 DebugLoc dl, SelectionDAG &DAG) {
1270 // Number of values to return
1271 unsigned NumRet = Outs.size();
1273 // Function returns value always on stack with the offset starting
1275 MachineFunction &MF = DAG.getMachineFunction();
1276 const Function *F = MF.getFunction();
1277 std::string FuncName = F->getName();
1279 const char *tmpName = createESName(PAN::getFrameLabel(FuncName));
1280 SDValue ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
1281 SDValue BS = DAG.getConstant(1, MVT::i8);
1283 for(unsigned i=0;i<NumRet; ++i) {
1284 RetVal = Outs[i].Val;
1285 Chain = DAG.getNode (PIC16ISD::PIC16Store, dl, MVT::Other, Chain, RetVal,
1287 DAG.getConstant (i, MVT::i8));
1290 return DAG.getNode(PIC16ISD::RET, dl, MVT::Other, Chain);
1293 void PIC16TargetLowering::
1294 GetDataAddress(DebugLoc dl, SDValue Callee, SDValue &Chain,
1295 SDValue &DataAddr_Lo, SDValue &DataAddr_Hi,
1296 SelectionDAG &DAG) {
1297 assert (Callee.getOpcode() == PIC16ISD::PIC16Connect
1298 && "Don't know what to do of such callee!!");
1299 SDValue ZeroOperand = DAG.getConstant(0, MVT::i8);
1300 SDValue SeqStart = DAG.getCALLSEQ_START(Chain, ZeroOperand);
1301 Chain = getChain(SeqStart);
1302 SDValue OperFlag = getOutFlag(SeqStart); // To manage the data dependency
1304 // Get the Lo and Hi part of code address
1305 SDValue Lo = Callee.getOperand(0);
1306 SDValue Hi = Callee.getOperand(1);
1308 SDValue Data_Lo, Data_Hi;
1309 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other, MVT::Flag);
1310 // Subtract 2 from Address to get the Lower part of DataAddress.
1311 SDVTList VTList = DAG.getVTList(MVT::i8, MVT::Flag);
1312 Data_Lo = DAG.getNode(ISD::SUBC, dl, VTList, Lo,
1313 DAG.getConstant(2, MVT::i8));
1314 SDValue Ops[3] = { Hi, DAG.getConstant(0, MVT::i8), Data_Lo.getValue(1)};
1315 Data_Hi = DAG.getNode(ISD::SUBE, dl, VTList, Ops, 3);
1316 SDValue PCLATH = DAG.getNode(PIC16ISD::MTPCLATH, dl, MVT::i8, Data_Hi);
1317 Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Data_Lo, PCLATH);
1318 SDValue Call = DAG.getNode(PIC16ISD::CALLW, dl, Tys, Chain, Callee,
1320 Chain = getChain(Call);
1321 OperFlag = getOutFlag(Call);
1322 SDValue SeqEnd = DAG.getCALLSEQ_END(Chain, ZeroOperand, ZeroOperand,
1324 Chain = getChain(SeqEnd);
1325 OperFlag = getOutFlag(SeqEnd);
1327 // Low part of Data Address
1328 DataAddr_Lo = DAG.getNode(PIC16ISD::MTLO, dl, MVT::i8, Call, OperFlag);
1330 // Make the second call.
1331 SeqStart = DAG.getCALLSEQ_START(Chain, ZeroOperand);
1332 Chain = getChain(SeqStart);
1333 OperFlag = getOutFlag(SeqStart); // To manage the data dependency
1335 // Subtract 1 from Address to get high part of data address.
1336 Data_Lo = DAG.getNode(ISD::SUBC, dl, VTList, Lo,
1337 DAG.getConstant(1, MVT::i8));
1338 SDValue HiOps[3] = { Hi, DAG.getConstant(0, MVT::i8), Data_Lo.getValue(1)};
1339 Data_Hi = DAG.getNode(ISD::SUBE, dl, VTList, HiOps, 3);
1340 PCLATH = DAG.getNode(PIC16ISD::MTPCLATH, dl, MVT::i8, Data_Hi);
1342 // Use new Lo to make another CALLW
1343 Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Data_Lo, PCLATH);
1344 Call = DAG.getNode(PIC16ISD::CALLW, dl, Tys, Chain, Callee, OperFlag);
1345 Chain = getChain(Call);
1346 OperFlag = getOutFlag(Call);
1347 SeqEnd = DAG.getCALLSEQ_END(Chain, ZeroOperand, ZeroOperand,
1349 Chain = getChain(SeqEnd);
1350 OperFlag = getOutFlag(SeqEnd);
1351 // Hi part of Data Address
1352 DataAddr_Hi = DAG.getNode(PIC16ISD::MTHI, dl, MVT::i8, Call, OperFlag);
1356 PIC16TargetLowering::LowerCall(SDValue Chain, SDValue Callee,
1357 CallingConv::ID CallConv, bool isVarArg,
1359 const SmallVectorImpl<ISD::OutputArg> &Outs,
1360 const SmallVectorImpl<ISD::InputArg> &Ins,
1361 DebugLoc dl, SelectionDAG &DAG,
1362 SmallVectorImpl<SDValue> &InVals) {
1363 // PIC16 target does not yet support tail call optimization.
1366 assert(Callee.getValueType() == MVT::i16 &&
1367 "Don't know how to legalize this call node!!!");
1369 // The flag to track if this is a direct or indirect call.
1370 bool IsDirectCall = true;
1371 unsigned RetVals = Ins.size();
1372 unsigned NumArgs = Outs.size();
1374 SDValue DataAddr_Lo, DataAddr_Hi;
1375 if (!isa<GlobalAddressSDNode>(Callee) &&
1376 !isa<ExternalSymbolSDNode>(Callee)) {
1377 IsDirectCall = false; // This is indirect call
1379 // If this is an indirect call then to pass the arguments
1380 // and read the return value back, we need the data address
1381 // of the function being called.
1382 // To get the data address two more calls need to be made.
1384 // Come here for indirect calls
1386 // Indirect addresses. Get the hi and lo parts of ptr.
1387 GetExpandedParts(Callee, DAG, Lo, Hi);
1388 // Connect Lo and Hi parts of the callee with the PIC16Connect
1389 Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Lo, Hi);
1391 // Read DataAddress only if we have to pass arguments or
1392 // read return value.
1393 if ((RetVals > 0) || (NumArgs > 0))
1394 GetDataAddress(dl, Callee, Chain, DataAddr_Lo, DataAddr_Hi, DAG);
1397 SDValue ZeroOperand = DAG.getConstant(0, MVT::i8);
1399 // Start the call sequence.
1400 // Carring the Constant 0 along the CALLSEQSTART
1401 // because there is nothing else to carry.
1402 SDValue SeqStart = DAG.getCALLSEQ_START(Chain, ZeroOperand);
1403 Chain = getChain(SeqStart);
1404 SDValue OperFlag = getOutFlag(SeqStart); // To manage the data dependency
1407 // For any direct call - callee will be GlobalAddressNode or
1409 SDValue ArgLabel, RetLabel;
1411 // Considering the GlobalAddressNode case here.
1412 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1413 GlobalValue *GV = G->getGlobal();
1414 Callee = DAG.getTargetGlobalAddress(GV, MVT::i8);
1415 Name = G->getGlobal()->getName();
1416 } else {// Considering the ExternalSymbol case here
1417 ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(Callee);
1418 Callee = DAG.getTargetExternalSymbol(ES->getSymbol(), MVT::i8);
1419 Name = ES->getSymbol();
1422 // Label for argument passing
1423 const char *argFrame = createESName(PAN::getArgsLabel(Name));
1424 ArgLabel = DAG.getTargetExternalSymbol(argFrame, MVT::i8);
1426 // Label for reading return value
1427 const char *retName = createESName(PAN::getRetvalLabel(Name));
1428 RetLabel = DAG.getTargetExternalSymbol(retName, MVT::i8);
1431 SDValue CodeAddr_Lo = Callee.getOperand(0);
1432 SDValue CodeAddr_Hi = Callee.getOperand(1);
1434 /*CodeAddr_Lo = DAG.getNode(ISD::ADD, dl, MVT::i8, CodeAddr_Lo,
1435 DAG.getConstant(2, MVT::i8));*/
1437 // move Hi part in PCLATH
1438 CodeAddr_Hi = DAG.getNode(PIC16ISD::MTPCLATH, dl, MVT::i8, CodeAddr_Hi);
1439 Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, CodeAddr_Lo,
1443 // Pass the argument to function before making the call.
1446 CallArgs = LowerDirectCallArguments(ArgLabel, Chain, OperFlag,
1448 Chain = getChain(CallArgs);
1449 OperFlag = getOutFlag(CallArgs);
1451 CallArgs = LowerIndirectCallArguments(Chain, OperFlag, DataAddr_Lo,
1452 DataAddr_Hi, Outs, Ins, dl, DAG);
1453 Chain = getChain(CallArgs);
1454 OperFlag = getOutFlag(CallArgs);
1457 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Flag);
1458 SDValue PICCall = DAG.getNode(PIC16ISD::CALL, dl, Tys, Chain, Callee,
1460 Chain = getChain(PICCall);
1461 OperFlag = getOutFlag(PICCall);
1464 // Carrying the Constant 0 along the CALLSEQSTART
1465 // because there is nothing else to carry.
1466 SDValue SeqEnd = DAG.getCALLSEQ_END(Chain, ZeroOperand, ZeroOperand,
1468 Chain = getChain(SeqEnd);
1469 OperFlag = getOutFlag(SeqEnd);
1471 // Lower the return value reading after the call.
1473 return LowerDirectCallReturn(RetLabel, Chain, OperFlag,
1474 Ins, dl, DAG, InVals);
1476 return LowerIndirectCallReturn(Chain, OperFlag, DataAddr_Lo,
1477 DataAddr_Hi, Ins, dl, DAG, InVals);
1480 bool PIC16TargetLowering::isDirectLoad(const SDValue Op) {
1481 if (Op.getOpcode() == PIC16ISD::PIC16Load)
1482 if (Op.getOperand(1).getOpcode() == ISD::TargetGlobalAddress
1483 || Op.getOperand(1).getOpcode() == ISD::TargetExternalSymbol)
1488 // NeedToConvertToMemOp - Returns true if one of the operands of the
1489 // operation 'Op' needs to be put into memory. Also returns the
1490 // operand no. of the operand to be converted in 'MemOp'. Remember, PIC16 has
1491 // no instruction that can operation on two registers. Most insns take
1492 // one register and one memory operand (addwf) / Constant (addlw).
1493 bool PIC16TargetLowering::NeedToConvertToMemOp(SDValue Op, unsigned &MemOp,
1494 SelectionDAG &DAG) {
1495 // If one of the operand is a constant, return false.
1496 if (Op.getOperand(0).getOpcode() == ISD::Constant ||
1497 Op.getOperand(1).getOpcode() == ISD::Constant)
1500 // Return false if one of the operands is already a direct
1501 // load and that operand has only one use.
1502 if (isDirectLoad(Op.getOperand(0))) {
1503 if (Op.getOperand(0).hasOneUse()) {
1504 // Legal and profitable folding check uses the NodeId of DAG nodes.
1505 // This NodeId is assigned by topological order. Therefore first
1506 // assign topological order then perform legal and profitable check.
1507 // Note:- Though this ordering is done before begining with legalization,
1508 // newly added node during legalization process have NodeId=-1 (NewNode)
1509 // therefore before performing any check proper ordering of the node is
1511 DAG.AssignTopologicalOrder();
1513 // Direct load operands are folded in binary operations. But before folding
1514 // verify if this folding is legal. Fold only if it is legal otherwise
1515 // convert this direct load to a separate memory operation.
1516 if(ISel->IsLegalAndProfitableToFold(Op.getOperand(0).getNode(),
1517 Op.getNode(), Op.getNode()))
1524 // For operations that are non-cummutative there is no need to check
1525 // for right operand because folding right operand may result in
1526 // incorrect operation.
1527 if (! SelectionDAG::isCommutativeBinOp(Op.getOpcode()))
1530 if (isDirectLoad(Op.getOperand(1))) {
1531 if (Op.getOperand(1).hasOneUse())
1539 // LowerBinOp - Lower a commutative binary operation that does not
1540 // affect status flag carry.
1541 SDValue PIC16TargetLowering::LowerBinOp(SDValue Op, SelectionDAG &DAG) {
1542 DebugLoc dl = Op.getDebugLoc();
1544 // We should have handled larger operands in type legalizer itself.
1545 assert (Op.getValueType() == MVT::i8 && "illegal Op to lower");
1548 if (NeedToConvertToMemOp(Op, MemOp, DAG)) {
1549 // Put one value on stack.
1550 SDValue NewVal = ConvertToMemOperand (Op.getOperand(MemOp), DAG, dl);
1552 return DAG.getNode(Op.getOpcode(), dl, MVT::i8, Op.getOperand(MemOp ^ 1),
1560 // LowerADD - Lower all types of ADD operations including the ones
1561 // that affects carry.
1562 SDValue PIC16TargetLowering::LowerADD(SDValue Op, SelectionDAG &DAG) {
1563 // We should have handled larger operands in type legalizer itself.
1564 assert (Op.getValueType() == MVT::i8 && "illegal add to lower");
1565 DebugLoc dl = Op.getDebugLoc();
1567 if (NeedToConvertToMemOp(Op, MemOp, DAG)) {
1568 // Put one value on stack.
1569 SDValue NewVal = ConvertToMemOperand (Op.getOperand(MemOp), DAG, dl);
1571 // ADDC and ADDE produce two results.
1572 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
1574 // ADDE has three operands, the last one is the carry bit.
1575 if (Op.getOpcode() == ISD::ADDE)
1576 return DAG.getNode(Op.getOpcode(), dl, Tys, Op.getOperand(MemOp ^ 1),
1577 NewVal, Op.getOperand(2));
1578 // ADDC has two operands.
1579 else if (Op.getOpcode() == ISD::ADDC)
1580 return DAG.getNode(Op.getOpcode(), dl, Tys, Op.getOperand(MemOp ^ 1),
1582 // ADD it is. It produces only one result.
1584 return DAG.getNode(Op.getOpcode(), dl, MVT::i8, Op.getOperand(MemOp ^ 1),
1591 SDValue PIC16TargetLowering::LowerSUB(SDValue Op, SelectionDAG &DAG) {
1592 DebugLoc dl = Op.getDebugLoc();
1593 // We should have handled larger operands in type legalizer itself.
1594 assert (Op.getValueType() == MVT::i8 && "illegal sub to lower");
1596 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
1598 // Since we don't have an instruction for X - c ,
1599 // we can change it to X + (-c)
1600 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1));
1601 if (C && (Op.getOpcode() == ISD::SUB))
1603 return DAG.getNode(ISD::ADD,
1604 dl, MVT::i8, Op.getOperand(0),
1605 DAG.getConstant(0-(C->getZExtValue()), MVT::i8));
1608 if (NeedToConvertToMemOp(Op, MemOp, DAG) ||
1609 (isDirectLoad(Op.getOperand(1)) &&
1610 (!isDirectLoad(Op.getOperand(0))) &&
1611 (Op.getOperand(0).getOpcode() != ISD::Constant)))
1613 // Put first operand on stack.
1614 SDValue NewVal = ConvertToMemOperand (Op.getOperand(0), DAG, dl);
1616 switch (Op.getOpcode()) {
1618 assert (0 && "Opcode unknown.");
1620 return DAG.getNode(Op.getOpcode(),
1621 dl, Tys, NewVal, Op.getOperand(1),
1625 return DAG.getNode(Op.getOpcode(),
1626 dl, Tys, NewVal, Op.getOperand(1));
1629 return DAG.getNode(Op.getOpcode(),
1630 dl, MVT::i8, NewVal, Op.getOperand(1));
1638 void PIC16TargetLowering::InitReservedFrameCount(const Function *F) {
1639 unsigned NumArgs = F->arg_size();
1641 bool isVoidFunc = (F->getReturnType()->getTypeID() == Type::VoidTyID);
1644 ReservedFrameCount = NumArgs;
1646 ReservedFrameCount = NumArgs + 1;
1649 // LowerFormalArguments - Argument values are loaded from the
1650 // <fname>.args + offset. All arguments are already broken to leaglized
1651 // types, so the offset just runs from 0 to NumArgVals - 1.
1654 PIC16TargetLowering::LowerFormalArguments(SDValue Chain,
1655 CallingConv::ID CallConv,
1657 const SmallVectorImpl<ISD::InputArg> &Ins,
1660 SmallVectorImpl<SDValue> &InVals) {
1661 unsigned NumArgVals = Ins.size();
1663 // Get the callee's name to create the <fname>.args label to pass args.
1664 MachineFunction &MF = DAG.getMachineFunction();
1665 const Function *F = MF.getFunction();
1666 std::string FuncName = F->getName();
1668 // Reset the map of FI and TmpOffset
1669 ResetTmpOffsetMap();
1670 // Initialize the ReserveFrameCount
1671 InitReservedFrameCount(F);
1673 // Create the <fname>.args external symbol.
1674 const char *tmpName = createESName(PAN::getArgsLabel(FuncName));
1675 SDValue ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
1677 // Load arg values from the label + offset.
1678 SDVTList VTs = DAG.getVTList (MVT::i8, MVT::Other);
1679 SDValue BS = DAG.getConstant(1, MVT::i8);
1680 for (unsigned i = 0; i < NumArgVals ; ++i) {
1681 SDValue Offset = DAG.getConstant(i, MVT::i8);
1682 SDValue PICLoad = DAG.getNode(PIC16ISD::PIC16LdArg, dl, VTs, Chain, ES, BS,
1684 Chain = getChain(PICLoad);
1685 InVals.push_back(PICLoad);
1691 // Perform DAGCombine of PIC16Load.
1692 // FIXME - Need a more elaborate comment here.
1693 SDValue PIC16TargetLowering::
1694 PerformPIC16LoadCombine(SDNode *N, DAGCombinerInfo &DCI) const {
1695 SelectionDAG &DAG = DCI.DAG;
1696 SDValue Chain = N->getOperand(0);
1697 if (N->hasNUsesOfValue(0, 0)) {
1698 DAG.ReplaceAllUsesOfValueWith(SDValue(N,1), Chain);
1703 // For all the functions with arguments some STORE nodes are generated
1704 // that store the argument on the frameindex. However in PIC16 the arguments
1705 // are passed on stack only. Therefore these STORE nodes are redundant.
1706 // To remove these STORE nodes will be removed in PerformStoreCombine
1708 // Currently this function is doint nothing and will be updated for removing
1709 // unwanted store operations
1710 SDValue PIC16TargetLowering::
1711 PerformStoreCombine(SDNode *N, DAGCombinerInfo &DCI) const {
1712 return SDValue(N, 0);
1714 // Storing an undef value is of no use, so remove it
1715 if (isStoringUndef(N, Chain, DAG)) {
1716 return Chain; // remove the store and return the chain
1718 //else everything is ok.
1719 return SDValue(N, 0);
1723 SDValue PIC16TargetLowering::PerformDAGCombine(SDNode *N,
1724 DAGCombinerInfo &DCI) const {
1725 switch (N->getOpcode()) {
1727 return PerformStoreCombine(N, DCI);
1728 case PIC16ISD::PIC16Load:
1729 return PerformPIC16LoadCombine(N, DCI);
1734 static PIC16CC::CondCodes IntCCToPIC16CC(ISD::CondCode CC) {
1736 default: llvm_unreachable("Unknown condition code!");
1737 case ISD::SETNE: return PIC16CC::NE;
1738 case ISD::SETEQ: return PIC16CC::EQ;
1739 case ISD::SETGT: return PIC16CC::GT;
1740 case ISD::SETGE: return PIC16CC::GE;
1741 case ISD::SETLT: return PIC16CC::LT;
1742 case ISD::SETLE: return PIC16CC::LE;
1743 case ISD::SETULT: return PIC16CC::ULT;
1744 case ISD::SETULE: return PIC16CC::ULE;
1745 case ISD::SETUGE: return PIC16CC::UGE;
1746 case ISD::SETUGT: return PIC16CC::UGT;
1750 // Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so
1751 // set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition.
1752 static void LookThroughSetCC(SDValue &LHS, SDValue &RHS,
1753 ISD::CondCode CC, unsigned &SPCC) {
1754 if (isa<ConstantSDNode>(RHS) &&
1755 cast<ConstantSDNode>(RHS)->getZExtValue() == 0 &&
1757 (LHS.getOpcode() == PIC16ISD::SELECT_ICC &&
1758 LHS.getOperand(3).getOpcode() == PIC16ISD::SUBCC) &&
1759 isa<ConstantSDNode>(LHS.getOperand(0)) &&
1760 isa<ConstantSDNode>(LHS.getOperand(1)) &&
1761 cast<ConstantSDNode>(LHS.getOperand(0))->getZExtValue() == 1 &&
1762 cast<ConstantSDNode>(LHS.getOperand(1))->getZExtValue() == 0) {
1763 SDValue CMPCC = LHS.getOperand(3);
1764 SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getZExtValue();
1765 LHS = CMPCC.getOperand(0);
1766 RHS = CMPCC.getOperand(1);
1770 // Returns appropriate CMP insn and corresponding condition code in PIC16CC
1771 SDValue PIC16TargetLowering::getPIC16Cmp(SDValue LHS, SDValue RHS,
1772 unsigned CC, SDValue &PIC16CC,
1773 SelectionDAG &DAG, DebugLoc dl) {
1774 PIC16CC::CondCodes CondCode = (PIC16CC::CondCodes) CC;
1776 // PIC16 sub is literal - W. So Swap the operands and condition if needed.
1777 // i.e. a < 12 can be rewritten as 12 > a.
1778 if (RHS.getOpcode() == ISD::Constant) {
1787 CondCode = PIC16CC::GT;
1790 CondCode = PIC16CC::LT;
1793 CondCode = PIC16CC::UGT;
1796 CondCode = PIC16CC::ULT;
1799 CondCode = PIC16CC::LE;
1802 CondCode = PIC16CC::GE;
1805 CondCode = PIC16CC::UGE;
1808 CondCode = PIC16CC::ULE;
1813 PIC16CC = DAG.getConstant(CondCode, MVT::i8);
1815 // These are signed comparisons.
1816 SDValue Mask = DAG.getConstant(128, MVT::i8);
1817 if (isSignedComparison(CondCode)) {
1818 LHS = DAG.getNode (ISD::XOR, dl, MVT::i8, LHS, Mask);
1819 RHS = DAG.getNode (ISD::XOR, dl, MVT::i8, RHS, Mask);
1822 SDVTList VTs = DAG.getVTList (MVT::i8, MVT::Flag);
1823 // We can use a subtract operation to set the condition codes. But
1824 // we need to put one operand in memory if required.
1825 // Nothing to do if the first operand is already a valid type (direct load
1826 // for subwf and literal for sublw) and it is used by this operation only.
1827 if ((LHS.getOpcode() == ISD::Constant || isDirectLoad(LHS))
1829 return DAG.getNode(PIC16ISD::SUBCC, dl, VTs, LHS, RHS);
1831 // else convert the first operand to mem.
1832 LHS = ConvertToMemOperand (LHS, DAG, dl);
1833 return DAG.getNode(PIC16ISD::SUBCC, dl, VTs, LHS, RHS);
1837 SDValue PIC16TargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
1838 SDValue LHS = Op.getOperand(0);
1839 SDValue RHS = Op.getOperand(1);
1840 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1841 SDValue TrueVal = Op.getOperand(2);
1842 SDValue FalseVal = Op.getOperand(3);
1843 unsigned ORIGCC = ~0;
1844 DebugLoc dl = Op.getDebugLoc();
1846 // If this is a select_cc of a "setcc", and if the setcc got lowered into
1847 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
1849 // A setcc: lhs, rhs, cc is expanded by llvm to
1850 // select_cc: result of setcc, 0, 1, 0, setne
1851 // We can think of it as:
1852 // select_cc: lhs, rhs, 1, 0, cc
1853 LookThroughSetCC(LHS, RHS, CC, ORIGCC);
1854 if (ORIGCC == ~0U) ORIGCC = IntCCToPIC16CC (CC);
1857 SDValue Cmp = getPIC16Cmp(LHS, RHS, ORIGCC, PIC16CC, DAG, dl);
1859 return DAG.getNode (PIC16ISD::SELECT_ICC, dl, TrueVal.getValueType(), TrueVal,
1860 FalseVal, PIC16CC, Cmp.getValue(1));
1864 PIC16TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1865 MachineBasicBlock *BB,
1866 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
1867 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
1868 unsigned CC = (PIC16CC::CondCodes)MI->getOperand(3).getImm();
1869 DebugLoc dl = MI->getDebugLoc();
1871 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
1872 // control-flow pattern. The incoming instruction knows the destination vreg
1873 // to set, the condition code register to branch on, the true/false values to
1874 // select between, and a branch opcode to use.
1875 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1876 MachineFunction::iterator It = BB;
1883 // fallthrough --> copy0MBB
1884 MachineBasicBlock *thisMBB = BB;
1885 MachineFunction *F = BB->getParent();
1886 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1887 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
1888 BuildMI(BB, dl, TII.get(PIC16::pic16brcond)).addMBB(sinkMBB).addImm(CC);
1889 F->insert(It, copy0MBB);
1890 F->insert(It, sinkMBB);
1892 // Update machine-CFG edges by first adding all successors of the current
1893 // block to the new block which will contain the Phi node for the select.
1894 // Also inform sdisel of the edge changes.
1895 for (MachineBasicBlock::succ_iterator I = BB->succ_begin(),
1896 E = BB->succ_end(); I != E; ++I) {
1897 EM->insert(std::make_pair(*I, sinkMBB));
1898 sinkMBB->addSuccessor(*I);
1900 // Next, remove all successors of the current block, and add the true
1901 // and fallthrough blocks as its successors.
1902 while (!BB->succ_empty())
1903 BB->removeSuccessor(BB->succ_begin());
1904 // Next, add the true and fallthrough blocks as its successors.
1905 BB->addSuccessor(copy0MBB);
1906 BB->addSuccessor(sinkMBB);
1909 // %FalseValue = ...
1910 // # fallthrough to sinkMBB
1913 // Update machine-CFG edges
1914 BB->addSuccessor(sinkMBB);
1917 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1920 BuildMI(BB, dl, TII.get(PIC16::PHI), MI->getOperand(0).getReg())
1921 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
1922 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
1924 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
1929 SDValue PIC16TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
1930 SDValue Chain = Op.getOperand(0);
1931 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1932 SDValue LHS = Op.getOperand(2); // LHS of the condition.
1933 SDValue RHS = Op.getOperand(3); // RHS of the condition.
1934 SDValue Dest = Op.getOperand(4); // BB to jump to
1935 unsigned ORIGCC = ~0;
1936 DebugLoc dl = Op.getDebugLoc();
1938 // If this is a br_cc of a "setcc", and if the setcc got lowered into
1939 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
1940 LookThroughSetCC(LHS, RHS, CC, ORIGCC);
1941 if (ORIGCC == ~0U) ORIGCC = IntCCToPIC16CC (CC);
1943 // Get the Compare insn and condition code.
1945 SDValue Cmp = getPIC16Cmp(LHS, RHS, ORIGCC, PIC16CC, DAG, dl);
1947 return DAG.getNode(PIC16ISD::BRCOND, dl, MVT::Other, Chain, Dest, PIC16CC,