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 "PIC16ISelLowering.h"
16 #include "PIC16TargetObjectFile.h"
17 #include "PIC16TargetMachine.h"
18 #include "llvm/DerivedTypes.h"
19 #include "llvm/GlobalValue.h"
20 #include "llvm/Function.h"
21 #include "llvm/CallingConv.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/MachineFunction.h"
24 #include "llvm/CodeGen/MachineInstrBuilder.h"
25 #include "llvm/CodeGen/MachineRegisterInfo.h"
26 #include "llvm/Support/ErrorHandling.h"
31 static const char *getIntrinsicName(unsigned opcode) {
34 default: llvm_unreachable("do not know intrinsic name");
35 // Arithmetic Right shift for integer types.
36 case PIC16ISD::SRA_I8: Basename = "sra.i8"; break;
37 case RTLIB::SRA_I16: Basename = "sra.i16"; break;
38 case RTLIB::SRA_I32: Basename = "sra.i32"; break;
40 // Left shift for integer types.
41 case PIC16ISD::SLL_I8: Basename = "sll.i8"; break;
42 case RTLIB::SHL_I16: Basename = "sll.i16"; break;
43 case RTLIB::SHL_I32: Basename = "sll.i32"; break;
45 // Logical Right Shift for integer types.
46 case PIC16ISD::SRL_I8: Basename = "srl.i8"; break;
47 case RTLIB::SRL_I16: Basename = "srl.i16"; break;
48 case RTLIB::SRL_I32: Basename = "srl.i32"; break;
50 // Multiply for integer types.
51 case PIC16ISD::MUL_I8: Basename = "mul.i8"; break;
52 case RTLIB::MUL_I16: Basename = "mul.i16"; break;
53 case RTLIB::MUL_I32: Basename = "mul.i32"; break;
55 // Signed division for integers.
56 case RTLIB::SDIV_I16: Basename = "sdiv.i16"; break;
57 case RTLIB::SDIV_I32: Basename = "sdiv.i32"; break;
59 // Unsigned division for integers.
60 case RTLIB::UDIV_I16: Basename = "udiv.i16"; break;
61 case RTLIB::UDIV_I32: Basename = "udiv.i32"; break;
63 // Signed Modulas for integers.
64 case RTLIB::SREM_I16: Basename = "srem.i16"; break;
65 case RTLIB::SREM_I32: Basename = "srem.i32"; break;
67 // Unsigned Modulas for integers.
68 case RTLIB::UREM_I16: Basename = "urem.i16"; break;
69 case RTLIB::UREM_I32: Basename = "urem.i32"; break;
71 //////////////////////
72 // LIBCALLS FOR FLOATS
73 //////////////////////
75 // Float to signed integrals
76 case RTLIB::FPTOSINT_F32_I8: Basename = "f32_to_si32"; break;
77 case RTLIB::FPTOSINT_F32_I16: Basename = "f32_to_si32"; break;
78 case RTLIB::FPTOSINT_F32_I32: Basename = "f32_to_si32"; break;
80 // Signed integrals to float. char and int are first sign extended to i32
81 // before being converted to float, so an I8_F32 or I16_F32 isn't required.
82 case RTLIB::SINTTOFP_I32_F32: Basename = "si32_to_f32"; break;
84 // Float to Unsigned conversions.
85 // Signed conversion can be used for unsigned conversion as well.
86 // In signed and unsigned versions only the interpretation of the
87 // MSB is different. Bit representation remains the same.
88 case RTLIB::FPTOUINT_F32_I8: Basename = "f32_to_si32"; break;
89 case RTLIB::FPTOUINT_F32_I16: Basename = "f32_to_si32"; break;
90 case RTLIB::FPTOUINT_F32_I32: Basename = "f32_to_si32"; break;
92 // Unsigned to Float conversions. char and int are first zero extended
93 // before being converted to float.
94 case RTLIB::UINTTOFP_I32_F32: Basename = "ui32_to_f32"; break;
96 // Floating point add, sub, mul, div.
97 case RTLIB::ADD_F32: Basename = "add.f32"; break;
98 case RTLIB::SUB_F32: Basename = "sub.f32"; break;
99 case RTLIB::MUL_F32: Basename = "mul.f32"; break;
100 case RTLIB::DIV_F32: Basename = "div.f32"; break;
102 // Floating point comparison
103 case RTLIB::O_F32: Basename = "unordered.f32"; break;
104 case RTLIB::UO_F32: Basename = "unordered.f32"; break;
105 case RTLIB::OLE_F32: Basename = "le.f32"; break;
106 case RTLIB::OGE_F32: Basename = "ge.f32"; break;
107 case RTLIB::OLT_F32: Basename = "lt.f32"; break;
108 case RTLIB::OGT_F32: Basename = "gt.f32"; break;
109 case RTLIB::OEQ_F32: Basename = "eq.f32"; break;
110 case RTLIB::UNE_F32: Basename = "neq.f32"; break;
113 std::string prefix = PAN::getTagName(PAN::PREFIX_SYMBOL);
114 std::string tagname = PAN::getTagName(PAN::LIBCALL);
115 std::string Fullname = prefix + tagname + Basename;
117 // The name has to live through program life.
118 return createESName(Fullname);
121 // getStdLibCallName - Get the name for the standard library function.
122 static const char *getStdLibCallName(unsigned opcode) {
123 std::string BaseName;
125 case RTLIB::COS_F32: BaseName = "cos";
127 case RTLIB::SIN_F32: BaseName = "sin";
129 case RTLIB::MEMCPY: BaseName = "memcpy";
131 case RTLIB::MEMSET: BaseName = "memset";
133 case RTLIB::MEMMOVE: BaseName = "memmove";
135 default: llvm_unreachable("do not know std lib call name");
137 std::string prefix = PAN::getTagName(PAN::PREFIX_SYMBOL);
138 std::string LibCallName = prefix + BaseName;
140 // The name has to live through program life.
141 return createESName(LibCallName);
144 // PIC16TargetLowering Constructor.
145 PIC16TargetLowering::PIC16TargetLowering(PIC16TargetMachine &TM)
146 : TargetLowering(TM, new PIC16TargetObjectFile()), TmpSize(0) {
148 Subtarget = &TM.getSubtarget<PIC16Subtarget>();
150 addRegisterClass(MVT::i8, PIC16::GPRRegisterClass);
152 setShiftAmountType(MVT::i8);
154 // Std lib call names
155 setLibcallName(RTLIB::COS_F32, getStdLibCallName(RTLIB::COS_F32));
156 setLibcallName(RTLIB::SIN_F32, getStdLibCallName(RTLIB::SIN_F32));
157 setLibcallName(RTLIB::MEMCPY, getStdLibCallName(RTLIB::MEMCPY));
158 setLibcallName(RTLIB::MEMSET, getStdLibCallName(RTLIB::MEMSET));
159 setLibcallName(RTLIB::MEMMOVE, getStdLibCallName(RTLIB::MEMMOVE));
161 // SRA library call names
162 setPIC16LibcallName(PIC16ISD::SRA_I8, getIntrinsicName(PIC16ISD::SRA_I8));
163 setLibcallName(RTLIB::SRA_I16, getIntrinsicName(RTLIB::SRA_I16));
164 setLibcallName(RTLIB::SRA_I32, getIntrinsicName(RTLIB::SRA_I32));
166 // SHL library call names
167 setPIC16LibcallName(PIC16ISD::SLL_I8, getIntrinsicName(PIC16ISD::SLL_I8));
168 setLibcallName(RTLIB::SHL_I16, getIntrinsicName(RTLIB::SHL_I16));
169 setLibcallName(RTLIB::SHL_I32, getIntrinsicName(RTLIB::SHL_I32));
171 // SRL library call names
172 setPIC16LibcallName(PIC16ISD::SRL_I8, getIntrinsicName(PIC16ISD::SRL_I8));
173 setLibcallName(RTLIB::SRL_I16, getIntrinsicName(RTLIB::SRL_I16));
174 setLibcallName(RTLIB::SRL_I32, getIntrinsicName(RTLIB::SRL_I32));
176 // MUL Library call names
177 setPIC16LibcallName(PIC16ISD::MUL_I8, getIntrinsicName(PIC16ISD::MUL_I8));
178 setLibcallName(RTLIB::MUL_I16, getIntrinsicName(RTLIB::MUL_I16));
179 setLibcallName(RTLIB::MUL_I32, getIntrinsicName(RTLIB::MUL_I32));
181 // Signed division lib call names
182 setLibcallName(RTLIB::SDIV_I16, getIntrinsicName(RTLIB::SDIV_I16));
183 setLibcallName(RTLIB::SDIV_I32, getIntrinsicName(RTLIB::SDIV_I32));
185 // Unsigned division lib call names
186 setLibcallName(RTLIB::UDIV_I16, getIntrinsicName(RTLIB::UDIV_I16));
187 setLibcallName(RTLIB::UDIV_I32, getIntrinsicName(RTLIB::UDIV_I32));
189 // Signed remainder lib call names
190 setLibcallName(RTLIB::SREM_I16, getIntrinsicName(RTLIB::SREM_I16));
191 setLibcallName(RTLIB::SREM_I32, getIntrinsicName(RTLIB::SREM_I32));
193 // Unsigned remainder lib call names
194 setLibcallName(RTLIB::UREM_I16, getIntrinsicName(RTLIB::UREM_I16));
195 setLibcallName(RTLIB::UREM_I32, getIntrinsicName(RTLIB::UREM_I32));
197 // Floating point to signed int conversions.
198 setLibcallName(RTLIB::FPTOSINT_F32_I8,
199 getIntrinsicName(RTLIB::FPTOSINT_F32_I8));
200 setLibcallName(RTLIB::FPTOSINT_F32_I16,
201 getIntrinsicName(RTLIB::FPTOSINT_F32_I16));
202 setLibcallName(RTLIB::FPTOSINT_F32_I32,
203 getIntrinsicName(RTLIB::FPTOSINT_F32_I32));
205 // Signed int to floats.
206 setLibcallName(RTLIB::SINTTOFP_I32_F32,
207 getIntrinsicName(RTLIB::SINTTOFP_I32_F32));
209 // Floating points to unsigned ints.
210 setLibcallName(RTLIB::FPTOUINT_F32_I8,
211 getIntrinsicName(RTLIB::FPTOUINT_F32_I8));
212 setLibcallName(RTLIB::FPTOUINT_F32_I16,
213 getIntrinsicName(RTLIB::FPTOUINT_F32_I16));
214 setLibcallName(RTLIB::FPTOUINT_F32_I32,
215 getIntrinsicName(RTLIB::FPTOUINT_F32_I32));
217 // Unsigned int to floats.
218 setLibcallName(RTLIB::UINTTOFP_I32_F32,
219 getIntrinsicName(RTLIB::UINTTOFP_I32_F32));
221 // Floating point add, sub, mul ,div.
222 setLibcallName(RTLIB::ADD_F32, getIntrinsicName(RTLIB::ADD_F32));
223 setLibcallName(RTLIB::SUB_F32, getIntrinsicName(RTLIB::SUB_F32));
224 setLibcallName(RTLIB::MUL_F32, getIntrinsicName(RTLIB::MUL_F32));
225 setLibcallName(RTLIB::DIV_F32, getIntrinsicName(RTLIB::DIV_F32));
227 // Floationg point comparison
228 setLibcallName(RTLIB::UO_F32, getIntrinsicName(RTLIB::UO_F32));
229 setLibcallName(RTLIB::OLE_F32, getIntrinsicName(RTLIB::OLE_F32));
230 setLibcallName(RTLIB::OGE_F32, getIntrinsicName(RTLIB::OGE_F32));
231 setLibcallName(RTLIB::OLT_F32, getIntrinsicName(RTLIB::OLT_F32));
232 setLibcallName(RTLIB::OGT_F32, getIntrinsicName(RTLIB::OGT_F32));
233 setLibcallName(RTLIB::OEQ_F32, getIntrinsicName(RTLIB::OEQ_F32));
234 setLibcallName(RTLIB::UNE_F32, getIntrinsicName(RTLIB::UNE_F32));
236 // Return value comparisons of floating point calls.
237 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
238 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
239 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
240 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
241 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
242 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
243 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
244 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
246 setOperationAction(ISD::GlobalAddress, MVT::i16, Custom);
247 setOperationAction(ISD::ExternalSymbol, MVT::i16, Custom);
249 setOperationAction(ISD::LOAD, MVT::i8, Legal);
250 setOperationAction(ISD::LOAD, MVT::i16, Custom);
251 setOperationAction(ISD::LOAD, MVT::i32, Custom);
253 setOperationAction(ISD::STORE, MVT::i8, Legal);
254 setOperationAction(ISD::STORE, MVT::i16, Custom);
255 setOperationAction(ISD::STORE, MVT::i32, Custom);
256 setOperationAction(ISD::STORE, MVT::i64, Custom);
258 setOperationAction(ISD::ADDE, MVT::i8, Custom);
259 setOperationAction(ISD::ADDC, MVT::i8, Custom);
260 setOperationAction(ISD::SUBE, MVT::i8, Custom);
261 setOperationAction(ISD::SUBC, MVT::i8, Custom);
262 setOperationAction(ISD::SUB, MVT::i8, Custom);
263 setOperationAction(ISD::ADD, MVT::i8, Custom);
264 setOperationAction(ISD::ADD, MVT::i16, Custom);
266 setOperationAction(ISD::OR, MVT::i8, Custom);
267 setOperationAction(ISD::AND, MVT::i8, Custom);
268 setOperationAction(ISD::XOR, MVT::i8, Custom);
270 setOperationAction(ISD::FrameIndex, MVT::i16, Custom);
272 setOperationAction(ISD::MUL, MVT::i8, Custom);
274 setOperationAction(ISD::SMUL_LOHI, MVT::i8, Expand);
275 setOperationAction(ISD::UMUL_LOHI, MVT::i8, Expand);
276 setOperationAction(ISD::MULHU, MVT::i8, Expand);
277 setOperationAction(ISD::MULHS, MVT::i8, Expand);
279 setOperationAction(ISD::SRA, MVT::i8, Custom);
280 setOperationAction(ISD::SHL, MVT::i8, Custom);
281 setOperationAction(ISD::SRL, MVT::i8, Custom);
283 setOperationAction(ISD::ROTL, MVT::i8, Expand);
284 setOperationAction(ISD::ROTR, MVT::i8, Expand);
286 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
288 // PIC16 does not support shift parts
289 setOperationAction(ISD::SRA_PARTS, MVT::i8, Expand);
290 setOperationAction(ISD::SHL_PARTS, MVT::i8, Expand);
291 setOperationAction(ISD::SRL_PARTS, MVT::i8, Expand);
294 // PIC16 does not have a SETCC, expand it to SELECT_CC.
295 setOperationAction(ISD::SETCC, MVT::i8, Expand);
296 setOperationAction(ISD::SELECT, MVT::i8, Expand);
297 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
298 setOperationAction(ISD::BRIND, MVT::Other, Expand);
300 setOperationAction(ISD::SELECT_CC, MVT::i8, Custom);
301 setOperationAction(ISD::BR_CC, MVT::i8, Custom);
303 //setOperationAction(ISD::TRUNCATE, MVT::i16, Custom);
304 setTruncStoreAction(MVT::i16, MVT::i8, Custom);
306 // Now deduce the information based on the above mentioned
308 computeRegisterProperties();
311 // getOutFlag - Extract the flag result if the Op has it.
312 static SDValue getOutFlag(SDValue &Op) {
313 // Flag is the last value of the node.
314 SDValue Flag = Op.getValue(Op.getNode()->getNumValues() - 1);
316 assert (Flag.getValueType() == MVT::Flag
317 && "Node does not have an out Flag");
321 // Get the TmpOffset for FrameIndex
322 unsigned PIC16TargetLowering::GetTmpOffsetForFI(unsigned FI, unsigned size) {
323 std::map<unsigned, unsigned>::iterator
324 MapIt = FiTmpOffsetMap.find(FI);
325 if (MapIt != FiTmpOffsetMap.end())
326 return MapIt->second;
328 // This FI (FrameIndex) is not yet mapped, so map it
329 FiTmpOffsetMap[FI] = TmpSize;
331 return FiTmpOffsetMap[FI];
334 // To extract chain value from the SDValue Nodes
335 // This function will help to maintain the chain extracting
336 // code at one place. In case of any change in future it will
337 // help maintain the code.
338 static SDValue getChain(SDValue &Op) {
339 SDValue Chain = Op.getValue(Op.getNode()->getNumValues() - 1);
341 // If the last value returned in Flag then the chain is
342 // second last value returned.
343 if (Chain.getValueType() == MVT::Flag)
344 Chain = Op.getValue(Op.getNode()->getNumValues() - 2);
346 // All nodes may not produce a chain. Therefore following assert
347 // verifies that the node is returning a chain only.
348 assert (Chain.getValueType() == MVT::Other
349 && "Node does not have a chain");
354 /// PopulateResults - Helper function to LowerOperation.
355 /// If a node wants to return multiple results after lowering,
356 /// it stuffs them into an array of SDValue called Results.
358 static void PopulateResults(SDValue N, SmallVectorImpl<SDValue>&Results) {
359 if (N.getOpcode() == ISD::MERGE_VALUES) {
360 int NumResults = N.getNumOperands();
361 for( int i = 0; i < NumResults; i++)
362 Results.push_back(N.getOperand(i));
365 Results.push_back(N);
368 MVT PIC16TargetLowering::getSetCCResultType(MVT ValType) const {
372 /// The type legalizer framework of generating legalizer can generate libcalls
373 /// only when the operand/result types are illegal.
374 /// PIC16 needs to generate libcalls even for the legal types (i8) for some ops.
375 /// For example an arithmetic right shift. These functions are used to lower
376 /// such operations that generate libcall for legal types.
379 PIC16TargetLowering::setPIC16LibcallName(PIC16ISD::PIC16Libcall Call,
381 PIC16LibcallNames[Call] = Name;
385 PIC16TargetLowering::getPIC16LibcallName(PIC16ISD::PIC16Libcall Call) {
386 return PIC16LibcallNames[Call];
390 PIC16TargetLowering::MakePIC16Libcall(PIC16ISD::PIC16Libcall Call,
391 MVT RetVT, const SDValue *Ops,
392 unsigned NumOps, bool isSigned,
393 SelectionDAG &DAG, DebugLoc dl) {
395 TargetLowering::ArgListTy Args;
396 Args.reserve(NumOps);
398 TargetLowering::ArgListEntry Entry;
399 for (unsigned i = 0; i != NumOps; ++i) {
401 Entry.Ty = Entry.Node.getValueType().getTypeForMVT();
402 Entry.isSExt = isSigned;
403 Entry.isZExt = !isSigned;
404 Args.push_back(Entry);
406 SDValue Callee = DAG.getExternalSymbol(getPIC16LibcallName(Call), MVT::i16);
408 const Type *RetTy = RetVT.getTypeForMVT();
409 std::pair<SDValue,SDValue> CallInfo =
410 LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
411 false, 0, CallingConv::C, false,
412 /*isReturnValueUsed=*/true,
413 Callee, Args, DAG, dl);
415 return CallInfo.first;
418 const char *PIC16TargetLowering::getTargetNodeName(unsigned Opcode) const {
420 default: return NULL;
421 case PIC16ISD::Lo: return "PIC16ISD::Lo";
422 case PIC16ISD::Hi: return "PIC16ISD::Hi";
423 case PIC16ISD::MTLO: return "PIC16ISD::MTLO";
424 case PIC16ISD::MTHI: return "PIC16ISD::MTHI";
425 case PIC16ISD::MTPCLATH: return "PIC16ISD::MTPCLATH";
426 case PIC16ISD::PIC16Connect: return "PIC16ISD::PIC16Connect";
427 case PIC16ISD::Banksel: return "PIC16ISD::Banksel";
428 case PIC16ISD::PIC16Load: return "PIC16ISD::PIC16Load";
429 case PIC16ISD::PIC16LdArg: return "PIC16ISD::PIC16LdArg";
430 case PIC16ISD::PIC16LdWF: return "PIC16ISD::PIC16LdWF";
431 case PIC16ISD::PIC16Store: return "PIC16ISD::PIC16Store";
432 case PIC16ISD::PIC16StWF: return "PIC16ISD::PIC16StWF";
433 case PIC16ISD::BCF: return "PIC16ISD::BCF";
434 case PIC16ISD::LSLF: return "PIC16ISD::LSLF";
435 case PIC16ISD::LRLF: return "PIC16ISD::LRLF";
436 case PIC16ISD::RLF: return "PIC16ISD::RLF";
437 case PIC16ISD::RRF: return "PIC16ISD::RRF";
438 case PIC16ISD::CALL: return "PIC16ISD::CALL";
439 case PIC16ISD::CALLW: return "PIC16ISD::CALLW";
440 case PIC16ISD::SUBCC: return "PIC16ISD::SUBCC";
441 case PIC16ISD::SELECT_ICC: return "PIC16ISD::SELECT_ICC";
442 case PIC16ISD::BRCOND: return "PIC16ISD::BRCOND";
443 case PIC16ISD::RET: return "PIC16ISD::RET";
444 case PIC16ISD::Dummy: return "PIC16ISD::Dummy";
448 void PIC16TargetLowering::ReplaceNodeResults(SDNode *N,
449 SmallVectorImpl<SDValue>&Results,
452 switch (N->getOpcode()) {
453 case ISD::GlobalAddress:
454 Results.push_back(ExpandGlobalAddress(N, DAG));
456 case ISD::ExternalSymbol:
457 Results.push_back(ExpandExternalSymbol(N, DAG));
460 Results.push_back(ExpandStore(N, DAG));
463 PopulateResults(ExpandLoad(N, DAG), Results);
466 // Results.push_back(ExpandAdd(N, DAG));
468 case ISD::FrameIndex:
469 Results.push_back(ExpandFrameIndex(N, DAG));
472 assert (0 && "not implemented");
477 SDValue PIC16TargetLowering::ExpandFrameIndex(SDNode *N, SelectionDAG &DAG) {
479 // Currently handling FrameIndex of size MVT::i16 only
480 // One example of this scenario is when return value is written on
483 if (N->getValueType(0) != MVT::i16)
486 // Expand the FrameIndex into ExternalSymbol and a Constant node
487 // The constant will represent the frame index number
488 // Get the current function frame
489 MachineFunction &MF = DAG.getMachineFunction();
490 const Function *Func = MF.getFunction();
491 const std::string Name = Func->getName();
493 FrameIndexSDNode *FR = dyn_cast<FrameIndexSDNode>(SDValue(N,0));
494 // FIXME there isn't really debug info here
495 DebugLoc dl = FR->getDebugLoc();
497 // Expand FrameIndex like GlobalAddress and ExternalSymbol
498 // Also use Offset field for lo and hi parts. The default
503 SDValue FI = SDValue(N,0);
504 LegalizeFrameIndex(FI, DAG, ES, FrameOffset);
505 SDValue Offset = DAG.getConstant(FrameOffset, MVT::i8);
506 SDValue Lo = DAG.getNode(PIC16ISD::Lo, dl, MVT::i8, ES, Offset);
507 SDValue Hi = DAG.getNode(PIC16ISD::Hi, dl, MVT::i8, ES, Offset);
508 return DAG.getNode(ISD::BUILD_PAIR, dl, N->getValueType(0), Lo, Hi);
512 SDValue PIC16TargetLowering::ExpandStore(SDNode *N, SelectionDAG &DAG) {
513 StoreSDNode *St = cast<StoreSDNode>(N);
514 SDValue Chain = St->getChain();
515 SDValue Src = St->getValue();
516 SDValue Ptr = St->getBasePtr();
517 MVT ValueType = Src.getValueType();
518 unsigned StoreOffset = 0;
519 DebugLoc dl = N->getDebugLoc();
521 SDValue PtrLo, PtrHi;
522 LegalizeAddress(Ptr, DAG, PtrLo, PtrHi, StoreOffset, dl);
524 if (ValueType == MVT::i8) {
525 return DAG.getNode (PIC16ISD::PIC16Store, dl, MVT::Other, Chain, Src,
527 DAG.getConstant (0 + StoreOffset, MVT::i8));
529 else if (ValueType == MVT::i16) {
530 // Get the Lo and Hi parts from MERGE_VALUE or BUILD_PAIR.
531 SDValue SrcLo, SrcHi;
532 GetExpandedParts(Src, DAG, SrcLo, SrcHi);
533 SDValue ChainLo = Chain, ChainHi = Chain;
534 if (Chain.getOpcode() == ISD::TokenFactor) {
535 ChainLo = Chain.getOperand(0);
536 ChainHi = Chain.getOperand(1);
538 SDValue Store1 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other,
541 DAG.getConstant (0 + StoreOffset, MVT::i8));
543 SDValue Store2 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other, ChainHi,
545 DAG.getConstant (1 + StoreOffset, MVT::i8));
547 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, getChain(Store1),
550 else if (ValueType == MVT::i32) {
551 // Get the Lo and Hi parts from MERGE_VALUE or BUILD_PAIR.
552 SDValue SrcLo, SrcHi;
553 GetExpandedParts(Src, DAG, SrcLo, SrcHi);
555 // Get the expanded parts of each of SrcLo and SrcHi.
556 SDValue SrcLo1, SrcLo2, SrcHi1, SrcHi2;
557 GetExpandedParts(SrcLo, DAG, SrcLo1, SrcLo2);
558 GetExpandedParts(SrcHi, DAG, SrcHi1, SrcHi2);
560 SDValue ChainLo = Chain, ChainHi = Chain;
561 if (Chain.getOpcode() == ISD::TokenFactor) {
562 ChainLo = Chain.getOperand(0);
563 ChainHi = Chain.getOperand(1);
565 SDValue ChainLo1 = ChainLo, ChainLo2 = ChainLo, ChainHi1 = ChainHi,
567 if (ChainLo.getOpcode() == ISD::TokenFactor) {
568 ChainLo1 = ChainLo.getOperand(0);
569 ChainLo2 = ChainLo.getOperand(1);
571 if (ChainHi.getOpcode() == ISD::TokenFactor) {
572 ChainHi1 = ChainHi.getOperand(0);
573 ChainHi2 = ChainHi.getOperand(1);
575 SDValue Store1 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other,
577 SrcLo1, PtrLo, PtrHi,
578 DAG.getConstant (0 + StoreOffset, MVT::i8));
580 SDValue Store2 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other, ChainLo2,
581 SrcLo2, PtrLo, PtrHi,
582 DAG.getConstant (1 + StoreOffset, MVT::i8));
584 SDValue Store3 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other, ChainHi1,
585 SrcHi1, PtrLo, PtrHi,
586 DAG.getConstant (2 + StoreOffset, MVT::i8));
588 SDValue Store4 = DAG.getNode(PIC16ISD::PIC16Store, dl, MVT::Other, ChainHi2,
589 SrcHi2, PtrLo, PtrHi,
590 DAG.getConstant (3 + StoreOffset, MVT::i8));
592 SDValue RetLo = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
593 getChain(Store1), getChain(Store2));
594 SDValue RetHi = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
595 getChain(Store3), getChain(Store4));
596 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, RetLo, RetHi);
598 } else if (ValueType == MVT::i64) {
599 SDValue SrcLo, SrcHi;
600 GetExpandedParts(Src, DAG, SrcLo, SrcHi);
601 SDValue ChainLo = Chain, ChainHi = Chain;
602 if (Chain.getOpcode() == ISD::TokenFactor) {
603 ChainLo = Chain.getOperand(0);
604 ChainHi = Chain.getOperand(1);
606 SDValue Store1 = DAG.getStore(ChainLo, dl, SrcLo, Ptr, NULL,
609 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
610 DAG.getConstant(4, Ptr.getValueType()));
611 SDValue Store2 = DAG.getStore(ChainHi, dl, SrcHi, Ptr, NULL,
614 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Store1,
617 assert (0 && "value type not supported");
622 SDValue PIC16TargetLowering::ExpandExternalSymbol(SDNode *N, SelectionDAG &DAG)
624 ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(SDValue(N, 0));
625 // FIXME there isn't really debug info here
626 DebugLoc dl = ES->getDebugLoc();
628 SDValue TES = DAG.getTargetExternalSymbol(ES->getSymbol(), MVT::i8);
629 SDValue Offset = DAG.getConstant(0, MVT::i8);
630 SDValue Lo = DAG.getNode(PIC16ISD::Lo, dl, MVT::i8, TES, Offset);
631 SDValue Hi = DAG.getNode(PIC16ISD::Hi, dl, MVT::i8, TES, Offset);
633 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i16, Lo, Hi);
636 // ExpandGlobalAddress -
637 SDValue PIC16TargetLowering::ExpandGlobalAddress(SDNode *N, SelectionDAG &DAG) {
638 GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(SDValue(N, 0));
639 // FIXME there isn't really debug info here
640 DebugLoc dl = G->getDebugLoc();
642 SDValue TGA = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i8,
645 SDValue Offset = DAG.getConstant(0, MVT::i8);
646 SDValue Lo = DAG.getNode(PIC16ISD::Lo, dl, MVT::i8, TGA, Offset);
647 SDValue Hi = DAG.getNode(PIC16ISD::Hi, dl, MVT::i8, TGA, Offset);
649 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i16, Lo, Hi);
652 bool PIC16TargetLowering::isDirectAddress(const SDValue &Op) {
653 assert (Op.getNode() != NULL && "Can't operate on NULL SDNode!!");
655 if (Op.getOpcode() == ISD::BUILD_PAIR) {
656 if (Op.getOperand(0).getOpcode() == PIC16ISD::Lo)
662 // Return true if DirectAddress is in ROM_SPACE
663 bool PIC16TargetLowering::isRomAddress(const SDValue &Op) {
665 // RomAddress is a GlobalAddress in ROM_SPACE_
666 // If the Op is not a GlobalAddress return NULL without checking
668 if (!isDirectAddress(Op))
671 // Its a GlobalAddress.
672 // It is BUILD_PAIR((PIC16Lo TGA), (PIC16Hi TGA)) and Op is BUILD_PAIR
673 SDValue TGA = Op.getOperand(0).getOperand(0);
674 GlobalAddressSDNode *GSDN = dyn_cast<GlobalAddressSDNode>(TGA);
676 if (GSDN->getAddressSpace() == PIC16ISD::ROM_SPACE)
679 // Any other address space return it false
684 // GetExpandedParts - This function is on the similiar lines as
685 // the GetExpandedInteger in type legalizer is. This returns expanded
686 // parts of Op in Lo and Hi.
688 void PIC16TargetLowering::GetExpandedParts(SDValue Op, SelectionDAG &DAG,
689 SDValue &Lo, SDValue &Hi) {
690 SDNode *N = Op.getNode();
691 DebugLoc dl = N->getDebugLoc();
692 MVT NewVT = getTypeToTransformTo(N->getValueType(0));
694 // Extract the lo component.
695 Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, NewVT, Op,
696 DAG.getConstant(0, MVT::i8));
698 // extract the hi component
699 Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, NewVT, Op,
700 DAG.getConstant(1, MVT::i8));
703 // Legalize FrameIndex into ExternalSymbol and offset.
705 PIC16TargetLowering::LegalizeFrameIndex(SDValue Op, SelectionDAG &DAG,
706 SDValue &ES, int &Offset) {
708 MachineFunction &MF = DAG.getMachineFunction();
709 const Function *Func = MF.getFunction();
710 MachineFrameInfo *MFI = MF.getFrameInfo();
711 const std::string Name = Func->getName();
713 FrameIndexSDNode *FR = dyn_cast<FrameIndexSDNode>(Op);
715 // FrameIndices are not stack offsets. But they represent the request
716 // for space on stack. That space requested may be more than one byte.
717 // Therefore, to calculate the stack offset that a FrameIndex aligns
718 // with, we need to traverse all the FrameIndices available earlier in
719 // the list and add their requested size.
720 unsigned FIndex = FR->getIndex();
722 if (FIndex < ReservedFrameCount) {
723 tmpName = createESName(PAN::getFrameLabel(Name));
724 ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
726 for (unsigned i=0; i<FIndex ; ++i) {
727 Offset += MFI->getObjectSize(i);
730 // FrameIndex has been made for some temporary storage
731 tmpName = createESName(PAN::getTempdataLabel(Name));
732 ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
733 Offset = GetTmpOffsetForFI(FIndex, MFI->getObjectSize(FIndex));
739 // This function legalizes the PIC16 Addresses. If the Pointer is
740 // -- Direct address variable residing
741 // --> then a Banksel for that variable will be created.
743 // --> then it will be treated as an indirect address.
744 // -- Indirect address
745 // --> then the address will be loaded into FSR
746 // -- ADD with constant operand
747 // --> then constant operand of ADD will be returned as Offset
748 // and non-constant operand of ADD will be treated as pointer.
749 // Returns the high and lo part of the address, and the offset(in case of ADD).
751 void PIC16TargetLowering::LegalizeAddress(SDValue Ptr, SelectionDAG &DAG,
752 SDValue &Lo, SDValue &Hi,
753 unsigned &Offset, DebugLoc dl) {
755 // Offset, by default, should be 0
758 // If the pointer is ADD with constant,
759 // return the constant value as the offset
760 if (Ptr.getOpcode() == ISD::ADD) {
761 SDValue OperLeft = Ptr.getOperand(0);
762 SDValue OperRight = Ptr.getOperand(1);
763 if ((OperLeft.getOpcode() == ISD::Constant) &&
764 (dyn_cast<ConstantSDNode>(OperLeft)->getZExtValue() < 32 )) {
765 Offset = dyn_cast<ConstantSDNode>(OperLeft)->getZExtValue();
767 } else if ((OperRight.getOpcode() == ISD::Constant) &&
768 (dyn_cast<ConstantSDNode>(OperRight)->getZExtValue() < 32 )){
769 Offset = dyn_cast<ConstantSDNode>(OperRight)->getZExtValue();
774 // If the pointer is Type i8 and an external symbol
775 // then treat it as direct address.
776 // One example for such case is storing and loading
777 // from function frame during a call
778 if (Ptr.getValueType() == MVT::i8) {
779 switch (Ptr.getOpcode()) {
780 case ISD::TargetExternalSymbol:
782 Hi = DAG.getConstant(1, MVT::i8);
787 // Expansion of FrameIndex has Lo/Hi parts
788 if (isDirectAddress(Ptr)) {
789 SDValue TFI = Ptr.getOperand(0).getOperand(0);
791 if (TFI.getOpcode() == ISD::TargetFrameIndex) {
792 LegalizeFrameIndex(TFI, DAG, Lo, FrameOffset);
793 Hi = DAG.getConstant(1, MVT::i8);
794 Offset += FrameOffset;
796 } else if (TFI.getOpcode() == ISD::TargetExternalSymbol) {
797 // FrameIndex has already been expanded.
798 // Now just make use of its expansion
800 Hi = DAG.getConstant(1, MVT::i8);
801 SDValue FOffset = Ptr.getOperand(0).getOperand(1);
802 assert (FOffset.getOpcode() == ISD::Constant &&
803 "Invalid operand of PIC16ISD::Lo");
804 Offset += dyn_cast<ConstantSDNode>(FOffset)->getZExtValue();
809 if (isDirectAddress(Ptr) && !isRomAddress(Ptr)) {
810 // Direct addressing case for RAM variables. The Hi part is constant
811 // and the Lo part is the TGA itself.
812 Lo = Ptr.getOperand(0).getOperand(0);
814 // For direct addresses Hi is a constant. Value 1 for the constant
815 // signifies that banksel needs to generated for it. Value 0 for
816 // the constant signifies that banksel does not need to be generated
817 // for it. Mark it as 1 now and optimize later.
818 Hi = DAG.getConstant(1, MVT::i8);
822 // Indirect addresses. Get the hi and lo parts of ptr.
823 GetExpandedParts(Ptr, DAG, Lo, Hi);
825 // Put the hi and lo parts into FSR.
826 Lo = DAG.getNode(PIC16ISD::MTLO, dl, MVT::i8, Lo);
827 Hi = DAG.getNode(PIC16ISD::MTHI, dl, MVT::i8, Hi);
832 SDValue PIC16TargetLowering::ExpandLoad(SDNode *N, SelectionDAG &DAG) {
833 LoadSDNode *LD = dyn_cast<LoadSDNode>(SDValue(N, 0));
834 SDValue Chain = LD->getChain();
835 SDValue Ptr = LD->getBasePtr();
836 DebugLoc dl = LD->getDebugLoc();
838 SDValue Load, Offset;
841 SDValue PtrLo, PtrHi;
844 // Legalize direct/indirect addresses. This will give the lo and hi parts
845 // of the address and the offset.
846 LegalizeAddress(Ptr, DAG, PtrLo, PtrHi, LoadOffset, dl);
848 // Load from the pointer (direct address or FSR)
849 VT = N->getValueType(0);
850 unsigned NumLoads = VT.getSizeInBits() / 8;
851 std::vector<SDValue> PICLoads;
853 MVT MemVT = LD->getMemoryVT();
854 if(ISD::isNON_EXTLoad(N)) {
855 for (iter=0; iter<NumLoads ; ++iter) {
856 // Add the pointer offset if any
857 Offset = DAG.getConstant(iter + LoadOffset, MVT::i8);
858 Tys = DAG.getVTList(MVT::i8, MVT::Other);
859 Load = DAG.getNode(PIC16ISD::PIC16Load, dl, Tys, Chain, PtrLo, PtrHi,
861 PICLoads.push_back(Load);
864 // If it is extended load then use PIC16Load for Memory Bytes
865 // and for all extended bytes perform action based on type of
866 // extention - i.e. SignExtendedLoad or ZeroExtendedLoad
869 // For extended loads this is the memory value type
870 // i.e. without any extension
871 MVT MemVT = LD->getMemoryVT();
872 unsigned MemBytes = MemVT.getSizeInBits() / 8;
873 // if MVT::i1 is extended to MVT::i8 then MemBytes will be zero
875 if (MemBytes == 0) MemBytes = 1;
877 unsigned ExtdBytes = VT.getSizeInBits() / 8;
878 Offset = DAG.getConstant(LoadOffset, MVT::i8);
880 Tys = DAG.getVTList(MVT::i8, MVT::Other);
881 // For MemBytes generate PIC16Load with proper offset
882 for (iter=0; iter < MemBytes; ++iter) {
883 // Add the pointer offset if any
884 Offset = DAG.getConstant(iter + LoadOffset, MVT::i8);
885 Load = DAG.getNode(PIC16ISD::PIC16Load, dl, Tys, Chain, PtrLo, PtrHi,
887 PICLoads.push_back(Load);
890 // For SignExtendedLoad
891 if (ISD::isSEXTLoad(N)) {
892 // For all ExtdBytes use the Right Shifted(Arithmetic) Value of the
894 SDValue SRA = DAG.getNode(ISD::SRA, dl, MVT::i8, Load,
895 DAG.getConstant(7, MVT::i8));
896 for (iter=MemBytes; iter<ExtdBytes; ++iter) {
897 PICLoads.push_back(SRA);
899 } else if (ISD::isZEXTLoad(N) || ISD::isEXTLoad(N)) {
900 //} else if (ISD::isZEXTLoad(N)) {
901 // ZeroExtendedLoad -- For all ExtdBytes use constant 0
902 SDValue ConstZero = DAG.getConstant(0, MVT::i8);
903 for (iter=MemBytes; iter<ExtdBytes; ++iter) {
904 PICLoads.push_back(ConstZero);
911 // Operand of Load is illegal -- Load itself is legal
914 else if (VT == MVT::i16) {
915 BP = DAG.getNode(ISD::BUILD_PAIR, dl, VT, PICLoads[0], PICLoads[1]);
916 if (MemVT == MVT::i8)
917 Chain = getChain(PICLoads[0]);
919 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
920 getChain(PICLoads[0]), getChain(PICLoads[1]));
921 } else if (VT == MVT::i32) {
923 BPs[0] = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i16,
924 PICLoads[0], PICLoads[1]);
925 BPs[1] = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i16,
926 PICLoads[2], PICLoads[3]);
927 BP = DAG.getNode(ISD::BUILD_PAIR, dl, VT, BPs[0], BPs[1]);
928 if (MemVT == MVT::i8)
929 Chain = getChain(PICLoads[0]);
930 else if (MemVT == MVT::i16)
931 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
932 getChain(PICLoads[0]), getChain(PICLoads[1]));
935 Chains[0] = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
936 getChain(PICLoads[0]), getChain(PICLoads[1]));
937 Chains[1] = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
938 getChain(PICLoads[2]), getChain(PICLoads[3]));
939 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
940 Chains[0], Chains[1]);
943 Tys = DAG.getVTList(VT, MVT::Other);
944 return DAG.getNode(ISD::MERGE_VALUES, dl, Tys, BP, Chain);
947 SDValue PIC16TargetLowering::LowerShift(SDValue Op, SelectionDAG &DAG) {
948 // We should have handled larger operands in type legalizer itself.
949 assert (Op.getValueType() == MVT::i8 && "illegal shift to lower");
951 SDNode *N = Op.getNode();
952 SDValue Value = N->getOperand(0);
953 SDValue Amt = N->getOperand(1);
954 PIC16ISD::PIC16Libcall CallCode;
955 switch (N->getOpcode()) {
957 CallCode = PIC16ISD::SRA_I8;
960 CallCode = PIC16ISD::SLL_I8;
963 CallCode = PIC16ISD::SRL_I8;
966 assert ( 0 && "This shift is not implemented yet.");
969 SmallVector<SDValue, 2> Ops(2);
972 SDValue Call = MakePIC16Libcall(CallCode, N->getValueType(0), &Ops[0], 2,
973 true, DAG, N->getDebugLoc());
977 SDValue PIC16TargetLowering::LowerMUL(SDValue Op, SelectionDAG &DAG) {
978 // We should have handled larger operands in type legalizer itself.
979 assert (Op.getValueType() == MVT::i8 && "illegal multiply to lower");
981 SDNode *N = Op.getNode();
982 SmallVector<SDValue, 2> Ops(2);
983 Ops[0] = N->getOperand(0);
984 Ops[1] = N->getOperand(1);
985 SDValue Call = MakePIC16Libcall(PIC16ISD::MUL_I8, N->getValueType(0),
986 &Ops[0], 2, true, DAG, N->getDebugLoc());
991 PIC16TargetLowering::LowerOperationWrapper(SDNode *N,
992 SmallVectorImpl<SDValue>&Results,
994 SDValue Op = SDValue(N, 0);
997 switch (Op.getOpcode()) {
999 Res = ExpandLoad(Op.getNode(), DAG); break;
1001 // All other operations are handled in LowerOperation.
1002 Res = LowerOperation(Op, DAG);
1004 Results.push_back(Res);
1011 unsigned NumValues = N->getNumValues();
1012 for (i = 0; i < NumValues ; i++) {
1013 Results.push_back(SDValue(N, i));
1017 SDValue PIC16TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
1018 switch (Op.getOpcode()) {
1022 return LowerADD(Op, DAG);
1026 return LowerSUB(Op, DAG);
1028 return ExpandLoad(Op.getNode(), DAG);
1030 return ExpandStore(Op.getNode(), DAG);
1032 return LowerMUL(Op, DAG);
1036 return LowerShift(Op, DAG);
1040 return LowerBinOp(Op, DAG);
1042 return LowerBR_CC(Op, DAG);
1043 case ISD::SELECT_CC:
1044 return LowerSELECT_CC(Op, DAG);
1049 SDValue PIC16TargetLowering::ConvertToMemOperand(SDValue Op,
1052 assert (Op.getValueType() == MVT::i8
1053 && "illegal value type to store on stack.");
1055 MachineFunction &MF = DAG.getMachineFunction();
1056 const Function *Func = MF.getFunction();
1057 const std::string FuncName = Func->getName();
1060 // Put the value on stack.
1061 // Get a stack slot index and convert to es.
1062 int FI = MF.getFrameInfo()->CreateStackObject(1, 1);
1063 const char *tmpName = createESName(PAN::getTempdataLabel(FuncName));
1064 SDValue ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
1066 // Store the value to ES.
1067 SDValue Store = DAG.getNode (PIC16ISD::PIC16Store, dl, MVT::Other,
1070 DAG.getConstant (1, MVT::i8), // Banksel.
1071 DAG.getConstant (GetTmpOffsetForFI(FI, 1),
1074 // Load the value from ES.
1075 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other);
1076 SDValue Load = DAG.getNode(PIC16ISD::PIC16Load, dl, Tys, Store,
1077 ES, DAG.getConstant (1, MVT::i8),
1078 DAG.getConstant (GetTmpOffsetForFI(FI, 1),
1081 return Load.getValue(0);
1084 SDValue PIC16TargetLowering::
1085 LowerIndirectCallArguments(SDValue Chain, SDValue InFlag,
1086 SDValue DataAddr_Lo, SDValue DataAddr_Hi,
1087 const SmallVectorImpl<ISD::OutputArg> &Outs,
1088 DebugLoc dl, SelectionDAG &DAG) {
1089 unsigned NumOps = Outs.size();
1091 // If call has no arguments then do nothing and return.
1095 std::vector<SDValue> Ops;
1096 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Flag);
1097 SDValue Arg, StoreRet;
1099 // For PIC16 ABI the arguments come after the return value.
1100 unsigned RetVals = Outs.size();
1101 for (unsigned i = 0, ArgOffset = RetVals; i < NumOps; i++) {
1102 // Get the arguments
1106 Ops.push_back(Chain);
1108 Ops.push_back(DataAddr_Lo);
1109 Ops.push_back(DataAddr_Hi);
1110 Ops.push_back(DAG.getConstant(ArgOffset, MVT::i8));
1111 Ops.push_back(InFlag);
1113 StoreRet = DAG.getNode (PIC16ISD::PIC16StWF, dl, Tys, &Ops[0], Ops.size());
1115 Chain = getChain(StoreRet);
1116 InFlag = getOutFlag(StoreRet);
1122 SDValue PIC16TargetLowering::
1123 LowerDirectCallArguments(SDValue ArgLabel, SDValue Chain, SDValue InFlag,
1124 const SmallVectorImpl<ISD::OutputArg> &Outs,
1125 DebugLoc dl, SelectionDAG &DAG) {
1126 unsigned NumOps = Outs.size();
1128 SDValue Arg, StoreAt;
1132 // If call has no arguments then do nothing and return.
1136 // FIXME: This portion of code currently assumes only
1137 // primitive types being passed as arguments.
1139 // Legalize the address before use
1140 SDValue PtrLo, PtrHi;
1141 unsigned AddressOffset;
1142 int StoreOffset = 0;
1143 LegalizeAddress(ArgLabel, DAG, PtrLo, PtrHi, AddressOffset, dl);
1146 std::vector<SDValue> Ops;
1147 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Flag);
1148 for (unsigned i=0, Offset = 0; i<NumOps; i++) {
1151 StoreOffset = (Offset + AddressOffset);
1153 // Store the argument on frame
1156 Ops.push_back(Chain);
1158 Ops.push_back(PtrLo);
1159 Ops.push_back(PtrHi);
1160 Ops.push_back(DAG.getConstant(StoreOffset, MVT::i8));
1161 Ops.push_back(InFlag);
1163 StoreRet = DAG.getNode (PIC16ISD::PIC16StWF, dl, Tys, &Ops[0], Ops.size());
1165 Chain = getChain(StoreRet);
1166 InFlag = getOutFlag(StoreRet);
1168 // Update the frame offset to be used for next argument
1169 ArgVT = Arg.getValueType();
1170 Size = ArgVT.getSizeInBits();
1171 Size = Size/8; // Calculate size in bytes
1172 Offset += Size; // Increase the frame offset
1177 SDValue PIC16TargetLowering::
1178 LowerIndirectCallReturn(SDValue Chain, SDValue InFlag,
1179 SDValue DataAddr_Lo, SDValue DataAddr_Hi,
1180 const SmallVectorImpl<ISD::InputArg> &Ins,
1181 DebugLoc dl, SelectionDAG &DAG,
1182 SmallVectorImpl<SDValue> &InVals) {
1183 unsigned RetVals = Ins.size();
1185 // If call does not have anything to return
1186 // then do nothing and go back.
1190 // Call has something to return
1193 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other, MVT::Flag);
1194 for(unsigned i=0;i<RetVals;i++) {
1195 LoadRet = DAG.getNode(PIC16ISD::PIC16LdWF, dl, Tys, Chain, DataAddr_Lo,
1196 DataAddr_Hi, DAG.getConstant(i, MVT::i8),
1198 InFlag = getOutFlag(LoadRet);
1199 Chain = getChain(LoadRet);
1200 InVals.push_back(LoadRet);
1205 SDValue PIC16TargetLowering::
1206 LowerDirectCallReturn(SDValue RetLabel, SDValue Chain, SDValue InFlag,
1207 const SmallVectorImpl<ISD::InputArg> &Ins,
1208 DebugLoc dl, SelectionDAG &DAG,
1209 SmallVectorImpl<SDValue> &InVals) {
1211 // Currently handling primitive types only. They will come in
1213 unsigned RetVals = Ins.size();
1215 // Return immediately if the return type is void
1219 // Call has something to return
1221 // Legalize the address before use
1224 LegalizeAddress(RetLabel, DAG, LdLo, LdHi, LdOffset, dl);
1226 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other, MVT::Flag);
1229 for(unsigned i=0, Offset=0;i<RetVals;i++) {
1231 LoadRet = DAG.getNode(PIC16ISD::PIC16LdWF, dl, Tys, Chain, LdLo, LdHi,
1232 DAG.getConstant(LdOffset + Offset, MVT::i8),
1235 InFlag = getOutFlag(LoadRet);
1237 Chain = getChain(LoadRet);
1239 InVals.push_back(LoadRet);
1246 PIC16TargetLowering::LowerReturn(SDValue Chain,
1247 unsigned CallConv, bool isVarArg,
1248 const SmallVectorImpl<ISD::OutputArg> &Outs,
1249 DebugLoc dl, SelectionDAG &DAG) {
1251 // Number of values to return
1252 unsigned NumRet = Outs.size();
1254 // Function returns value always on stack with the offset starting
1256 MachineFunction &MF = DAG.getMachineFunction();
1257 const Function *F = MF.getFunction();
1258 std::string FuncName = F->getName();
1260 const char *tmpName = createESName(PAN::getFrameLabel(FuncName));
1261 SDVTList VTs = DAG.getVTList (MVT::i8, MVT::Other);
1262 SDValue ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
1263 SDValue BS = DAG.getConstant(1, MVT::i8);
1265 for(unsigned i=0;i<NumRet; ++i) {
1266 RetVal = Outs[i].Val;
1267 Chain = DAG.getNode (PIC16ISD::PIC16Store, dl, MVT::Other, Chain, RetVal,
1269 DAG.getConstant (i, MVT::i8));
1272 return DAG.getNode(PIC16ISD::RET, dl, MVT::Other, Chain);
1275 void PIC16TargetLowering::
1276 GetDataAddress(DebugLoc dl, SDValue Callee, SDValue &Chain,
1277 SDValue &DataAddr_Lo, SDValue &DataAddr_Hi,
1278 SelectionDAG &DAG) {
1279 assert (Callee.getOpcode() == PIC16ISD::PIC16Connect
1280 && "Don't know what to do of such callee!!");
1281 SDValue ZeroOperand = DAG.getConstant(0, MVT::i8);
1282 SDValue SeqStart = DAG.getCALLSEQ_START(Chain, ZeroOperand);
1283 Chain = getChain(SeqStart);
1284 SDValue OperFlag = getOutFlag(SeqStart); // To manage the data dependency
1286 // Get the Lo and Hi part of code address
1287 SDValue Lo = Callee.getOperand(0);
1288 SDValue Hi = Callee.getOperand(1);
1290 SDValue Data_Lo, Data_Hi;
1291 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Other, MVT::Flag);
1292 // Subtract 2 from Address to get the Lower part of DataAddress.
1293 SDVTList VTList = DAG.getVTList(MVT::i8, MVT::Flag);
1294 Data_Lo = DAG.getNode(ISD::SUBC, dl, VTList, Lo,
1295 DAG.getConstant(2, MVT::i8));
1296 SDValue Ops[3] = { Hi, DAG.getConstant(0, MVT::i8), Data_Lo.getValue(1)};
1297 Data_Hi = DAG.getNode(ISD::SUBE, dl, VTList, Ops, 3);
1298 SDValue PCLATH = DAG.getNode(PIC16ISD::MTPCLATH, dl, MVT::i8, Data_Hi);
1299 Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Data_Lo, PCLATH);
1300 SDValue Call = DAG.getNode(PIC16ISD::CALLW, dl, Tys, Chain, Callee,
1302 Chain = getChain(Call);
1303 OperFlag = getOutFlag(Call);
1304 SDValue SeqEnd = DAG.getCALLSEQ_END(Chain, ZeroOperand, ZeroOperand,
1306 Chain = getChain(SeqEnd);
1307 OperFlag = getOutFlag(SeqEnd);
1309 // Low part of Data Address
1310 DataAddr_Lo = DAG.getNode(PIC16ISD::MTLO, dl, MVT::i8, Call, OperFlag);
1312 // Make the second call.
1313 SeqStart = DAG.getCALLSEQ_START(Chain, ZeroOperand);
1314 Chain = getChain(SeqStart);
1315 OperFlag = getOutFlag(SeqStart); // To manage the data dependency
1317 // Subtract 1 from Address to get high part of data address.
1318 Data_Lo = DAG.getNode(ISD::SUBC, dl, VTList, Lo,
1319 DAG.getConstant(1, MVT::i8));
1320 SDValue HiOps[3] = { Hi, DAG.getConstant(0, MVT::i8), Data_Lo.getValue(1)};
1321 Data_Hi = DAG.getNode(ISD::SUBE, dl, VTList, HiOps, 3);
1322 PCLATH = DAG.getNode(PIC16ISD::MTPCLATH, dl, MVT::i8, Data_Hi);
1324 // Use new Lo to make another CALLW
1325 Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Data_Lo, PCLATH);
1326 Call = DAG.getNode(PIC16ISD::CALLW, dl, Tys, Chain, Callee, OperFlag);
1327 Chain = getChain(Call);
1328 OperFlag = getOutFlag(Call);
1329 SeqEnd = DAG.getCALLSEQ_END(Chain, ZeroOperand, ZeroOperand,
1331 Chain = getChain(SeqEnd);
1332 OperFlag = getOutFlag(SeqEnd);
1333 // Hi part of Data Address
1334 DataAddr_Hi = DAG.getNode(PIC16ISD::MTHI, dl, MVT::i8, Call, OperFlag);
1338 PIC16TargetLowering::LowerCall(SDValue Chain, SDValue Callee,
1339 unsigned CallConv, bool isVarArg,
1341 const SmallVectorImpl<ISD::OutputArg> &Outs,
1342 const SmallVectorImpl<ISD::InputArg> &Ins,
1343 DebugLoc dl, SelectionDAG &DAG,
1344 SmallVectorImpl<SDValue> &InVals) {
1346 assert(Callee.getValueType() == MVT::i16 &&
1347 "Don't know how to legalize this call node!!!");
1349 // The flag to track if this is a direct or indirect call.
1350 bool IsDirectCall = true;
1351 unsigned RetVals = Ins.size();
1352 unsigned NumArgs = Outs.size();
1354 SDValue DataAddr_Lo, DataAddr_Hi;
1355 if (!isa<GlobalAddressSDNode>(Callee) &&
1356 !isa<ExternalSymbolSDNode>(Callee)) {
1357 IsDirectCall = false; // This is indirect call
1359 // If this is an indirect call then to pass the arguments
1360 // and read the return value back, we need the data address
1361 // of the function being called.
1362 // To get the data address two more calls need to be made.
1364 // Come here for indirect calls
1366 // Indirect addresses. Get the hi and lo parts of ptr.
1367 GetExpandedParts(Callee, DAG, Lo, Hi);
1368 // Connect Lo and Hi parts of the callee with the PIC16Connect
1369 Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, Lo, Hi);
1371 // Read DataAddress only if we have to pass arguments or
1372 // read return value.
1373 if ((RetVals > 0) || (NumArgs > 0))
1374 GetDataAddress(dl, Callee, Chain, DataAddr_Lo, DataAddr_Hi, DAG);
1377 SDValue ZeroOperand = DAG.getConstant(0, MVT::i8);
1379 // Start the call sequence.
1380 // Carring the Constant 0 along the CALLSEQSTART
1381 // because there is nothing else to carry.
1382 SDValue SeqStart = DAG.getCALLSEQ_START(Chain, ZeroOperand);
1383 Chain = getChain(SeqStart);
1384 SDValue OperFlag = getOutFlag(SeqStart); // To manage the data dependency
1387 // For any direct call - callee will be GlobalAddressNode or
1389 SDValue ArgLabel, RetLabel;
1391 // Considering the GlobalAddressNode case here.
1392 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1393 GlobalValue *GV = G->getGlobal();
1394 Callee = DAG.getTargetGlobalAddress(GV, MVT::i8);
1395 Name = G->getGlobal()->getName();
1396 } else {// Considering the ExternalSymbol case here
1397 ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(Callee);
1398 Callee = DAG.getTargetExternalSymbol(ES->getSymbol(), MVT::i8);
1399 Name = ES->getSymbol();
1402 // Label for argument passing
1403 const char *argFrame = createESName(PAN::getArgsLabel(Name));
1404 ArgLabel = DAG.getTargetExternalSymbol(argFrame, MVT::i8);
1406 // Label for reading return value
1407 const char *retName = createESName(PAN::getRetvalLabel(Name));
1408 RetLabel = DAG.getTargetExternalSymbol(retName, MVT::i8);
1411 SDValue CodeAddr_Lo = Callee.getOperand(0);
1412 SDValue CodeAddr_Hi = Callee.getOperand(1);
1414 /*CodeAddr_Lo = DAG.getNode(ISD::ADD, dl, MVT::i8, CodeAddr_Lo,
1415 DAG.getConstant(2, MVT::i8));*/
1417 // move Hi part in PCLATH
1418 CodeAddr_Hi = DAG.getNode(PIC16ISD::MTPCLATH, dl, MVT::i8, CodeAddr_Hi);
1419 Callee = DAG.getNode(PIC16ISD::PIC16Connect, dl, MVT::i8, CodeAddr_Lo,
1423 // Pass the argument to function before making the call.
1426 CallArgs = LowerDirectCallArguments(ArgLabel, Chain, OperFlag,
1428 Chain = getChain(CallArgs);
1429 OperFlag = getOutFlag(CallArgs);
1431 CallArgs = LowerIndirectCallArguments(Chain, OperFlag, DataAddr_Lo,
1432 DataAddr_Hi, Outs, dl, DAG);
1433 Chain = getChain(CallArgs);
1434 OperFlag = getOutFlag(CallArgs);
1437 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Flag);
1438 SDValue PICCall = DAG.getNode(PIC16ISD::CALL, dl, Tys, Chain, Callee,
1440 Chain = getChain(PICCall);
1441 OperFlag = getOutFlag(PICCall);
1444 // Carrying the Constant 0 along the CALLSEQSTART
1445 // because there is nothing else to carry.
1446 SDValue SeqEnd = DAG.getCALLSEQ_END(Chain, ZeroOperand, ZeroOperand,
1448 Chain = getChain(SeqEnd);
1449 OperFlag = getOutFlag(SeqEnd);
1451 // Lower the return value reading after the call.
1453 return LowerDirectCallReturn(RetLabel, Chain, OperFlag,
1454 Ins, dl, DAG, InVals);
1456 return LowerIndirectCallReturn(Chain, OperFlag, DataAddr_Lo,
1457 DataAddr_Hi, Ins, dl, DAG, InVals);
1460 bool PIC16TargetLowering::isDirectLoad(const SDValue Op) {
1461 if (Op.getOpcode() == PIC16ISD::PIC16Load)
1462 if (Op.getOperand(1).getOpcode() == ISD::TargetGlobalAddress
1463 || Op.getOperand(1).getOpcode() == ISD::TargetExternalSymbol)
1468 // NeedToConvertToMemOp - Returns true if one of the operands of the
1469 // operation 'Op' needs to be put into memory. Also returns the
1470 // operand no. of the operand to be converted in 'MemOp'. Remember, PIC16 has
1471 // no instruction that can operation on two registers. Most insns take
1472 // one register and one memory operand (addwf) / Constant (addlw).
1473 bool PIC16TargetLowering::NeedToConvertToMemOp(SDValue Op, unsigned &MemOp) {
1474 // If one of the operand is a constant, return false.
1475 if (Op.getOperand(0).getOpcode() == ISD::Constant ||
1476 Op.getOperand(1).getOpcode() == ISD::Constant)
1479 // Return false if one of the operands is already a direct
1480 // load and that operand has only one use.
1481 if (isDirectLoad(Op.getOperand(0))) {
1482 if (Op.getOperand(0).hasOneUse())
1487 if (isDirectLoad(Op.getOperand(1))) {
1488 if (Op.getOperand(1).hasOneUse())
1496 // LowerBinOp - Lower a commutative binary operation that does not
1497 // affect status flag carry.
1498 SDValue PIC16TargetLowering::LowerBinOp(SDValue Op, SelectionDAG &DAG) {
1499 DebugLoc dl = Op.getDebugLoc();
1501 // We should have handled larger operands in type legalizer itself.
1502 assert (Op.getValueType() == MVT::i8 && "illegal Op to lower");
1505 if (NeedToConvertToMemOp(Op, MemOp)) {
1506 // Put one value on stack.
1507 SDValue NewVal = ConvertToMemOperand (Op.getOperand(MemOp), DAG, dl);
1509 return DAG.getNode(Op.getOpcode(), dl, MVT::i8, Op.getOperand(MemOp ^ 1),
1517 // LowerADD - Lower all types of ADD operations including the ones
1518 // that affects carry.
1519 SDValue PIC16TargetLowering::LowerADD(SDValue Op, SelectionDAG &DAG) {
1520 // We should have handled larger operands in type legalizer itself.
1521 assert (Op.getValueType() == MVT::i8 && "illegal add to lower");
1522 DebugLoc dl = Op.getDebugLoc();
1524 if (NeedToConvertToMemOp(Op, MemOp)) {
1525 // Put one value on stack.
1526 SDValue NewVal = ConvertToMemOperand (Op.getOperand(MemOp), DAG, dl);
1528 // ADDC and ADDE produce two results.
1529 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
1531 // ADDE has three operands, the last one is the carry bit.
1532 if (Op.getOpcode() == ISD::ADDE)
1533 return DAG.getNode(Op.getOpcode(), dl, Tys, Op.getOperand(MemOp ^ 1),
1534 NewVal, Op.getOperand(2));
1535 // ADDC has two operands.
1536 else if (Op.getOpcode() == ISD::ADDC)
1537 return DAG.getNode(Op.getOpcode(), dl, Tys, Op.getOperand(MemOp ^ 1),
1539 // ADD it is. It produces only one result.
1541 return DAG.getNode(Op.getOpcode(), dl, MVT::i8, Op.getOperand(MemOp ^ 1),
1548 SDValue PIC16TargetLowering::LowerSUB(SDValue Op, SelectionDAG &DAG) {
1549 DebugLoc dl = Op.getDebugLoc();
1550 // We should have handled larger operands in type legalizer itself.
1551 assert (Op.getValueType() == MVT::i8 && "illegal sub to lower");
1553 // Nothing to do if the first operand is already a direct load and it has
1555 if (isDirectLoad(Op.getOperand(0)) && Op.getOperand(0).hasOneUse())
1558 // Put first operand on stack.
1559 SDValue NewVal = ConvertToMemOperand (Op.getOperand(0), DAG, dl);
1561 SDVTList Tys = DAG.getVTList(MVT::i8, MVT::Flag);
1562 switch (Op.getOpcode()) {
1564 assert (0 && "Opcode unknown.");
1566 return DAG.getNode(Op.getOpcode(), dl, Tys, NewVal, Op.getOperand(1),
1570 return DAG.getNode(Op.getOpcode(), dl, Tys, NewVal, Op.getOperand(1));
1573 return DAG.getNode(Op.getOpcode(), dl, MVT::i8, NewVal, Op.getOperand(1));
1578 void PIC16TargetLowering::InitReservedFrameCount(const Function *F) {
1579 unsigned NumArgs = F->arg_size();
1581 bool isVoidFunc = (F->getReturnType()->getTypeID() == Type::VoidTyID);
1584 ReservedFrameCount = NumArgs;
1586 ReservedFrameCount = NumArgs + 1;
1589 // LowerFormalArguments - Argument values are loaded from the
1590 // <fname>.args + offset. All arguments are already broken to leaglized
1591 // types, so the offset just runs from 0 to NumArgVals - 1.
1594 PIC16TargetLowering::LowerFormalArguments(SDValue Chain,
1597 const SmallVectorImpl<ISD::InputArg> &Ins,
1600 SmallVectorImpl<SDValue> &InVals) {
1601 unsigned NumArgVals = Ins.size();
1603 // Get the callee's name to create the <fname>.args label to pass args.
1604 MachineFunction &MF = DAG.getMachineFunction();
1605 const Function *F = MF.getFunction();
1606 std::string FuncName = F->getName();
1608 // Reset the map of FI and TmpOffset
1609 ResetTmpOffsetMap();
1610 // Initialize the ReserveFrameCount
1611 InitReservedFrameCount(F);
1613 // Create the <fname>.args external symbol.
1614 const char *tmpName = createESName(PAN::getArgsLabel(FuncName));
1615 SDValue ES = DAG.getTargetExternalSymbol(tmpName, MVT::i8);
1617 // Load arg values from the label + offset.
1618 SDVTList VTs = DAG.getVTList (MVT::i8, MVT::Other);
1619 SDValue BS = DAG.getConstant(1, MVT::i8);
1620 for (unsigned i = 0; i < NumArgVals ; ++i) {
1621 SDValue Offset = DAG.getConstant(i, MVT::i8);
1622 SDValue PICLoad = DAG.getNode(PIC16ISD::PIC16LdArg, dl, VTs, Chain, ES, BS,
1624 Chain = getChain(PICLoad);
1625 InVals.push_back(PICLoad);
1631 // Perform DAGCombine of PIC16Load.
1632 // FIXME - Need a more elaborate comment here.
1633 SDValue PIC16TargetLowering::
1634 PerformPIC16LoadCombine(SDNode *N, DAGCombinerInfo &DCI) const {
1635 SelectionDAG &DAG = DCI.DAG;
1636 SDValue Chain = N->getOperand(0);
1637 if (N->hasNUsesOfValue(0, 0)) {
1638 DAG.ReplaceAllUsesOfValueWith(SDValue(N,1), Chain);
1643 // For all the functions with arguments some STORE nodes are generated
1644 // that store the argument on the frameindex. However in PIC16 the arguments
1645 // are passed on stack only. Therefore these STORE nodes are redundant.
1646 // To remove these STORE nodes will be removed in PerformStoreCombine
1648 // Currently this function is doint nothing and will be updated for removing
1649 // unwanted store operations
1650 SDValue PIC16TargetLowering::
1651 PerformStoreCombine(SDNode *N, DAGCombinerInfo &DCI) const {
1652 return SDValue(N, 0);
1654 // Storing an undef value is of no use, so remove it
1655 if (isStoringUndef(N, Chain, DAG)) {
1656 return Chain; // remove the store and return the chain
1658 //else everything is ok.
1659 return SDValue(N, 0);
1663 SDValue PIC16TargetLowering::PerformDAGCombine(SDNode *N,
1664 DAGCombinerInfo &DCI) const {
1665 switch (N->getOpcode()) {
1667 return PerformStoreCombine(N, DCI);
1668 case PIC16ISD::PIC16Load:
1669 return PerformPIC16LoadCombine(N, DCI);
1674 static PIC16CC::CondCodes IntCCToPIC16CC(ISD::CondCode CC) {
1676 default: llvm_unreachable("Unknown condition code!");
1677 case ISD::SETNE: return PIC16CC::NE;
1678 case ISD::SETEQ: return PIC16CC::EQ;
1679 case ISD::SETGT: return PIC16CC::GT;
1680 case ISD::SETGE: return PIC16CC::GE;
1681 case ISD::SETLT: return PIC16CC::LT;
1682 case ISD::SETLE: return PIC16CC::LE;
1683 case ISD::SETULT: return PIC16CC::ULT;
1684 case ISD::SETULE: return PIC16CC::ULE;
1685 case ISD::SETUGE: return PIC16CC::UGE;
1686 case ISD::SETUGT: return PIC16CC::UGT;
1690 // Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so
1691 // set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition.
1692 static void LookThroughSetCC(SDValue &LHS, SDValue &RHS,
1693 ISD::CondCode CC, unsigned &SPCC) {
1694 if (isa<ConstantSDNode>(RHS) &&
1695 cast<ConstantSDNode>(RHS)->getZExtValue() == 0 &&
1697 (LHS.getOpcode() == PIC16ISD::SELECT_ICC &&
1698 LHS.getOperand(3).getOpcode() == PIC16ISD::SUBCC) &&
1699 isa<ConstantSDNode>(LHS.getOperand(0)) &&
1700 isa<ConstantSDNode>(LHS.getOperand(1)) &&
1701 cast<ConstantSDNode>(LHS.getOperand(0))->getZExtValue() == 1 &&
1702 cast<ConstantSDNode>(LHS.getOperand(1))->getZExtValue() == 0) {
1703 SDValue CMPCC = LHS.getOperand(3);
1704 SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getZExtValue();
1705 LHS = CMPCC.getOperand(0);
1706 RHS = CMPCC.getOperand(1);
1710 // Returns appropriate CMP insn and corresponding condition code in PIC16CC
1711 SDValue PIC16TargetLowering::getPIC16Cmp(SDValue LHS, SDValue RHS,
1712 unsigned CC, SDValue &PIC16CC,
1713 SelectionDAG &DAG, DebugLoc dl) {
1714 PIC16CC::CondCodes CondCode = (PIC16CC::CondCodes) CC;
1716 // PIC16 sub is literal - W. So Swap the operands and condition if needed.
1717 // i.e. a < 12 can be rewritten as 12 > a.
1718 if (RHS.getOpcode() == ISD::Constant) {
1727 CondCode = PIC16CC::GT;
1730 CondCode = PIC16CC::LT;
1733 CondCode = PIC16CC::UGT;
1736 CondCode = PIC16CC::ULT;
1739 CondCode = PIC16CC::LE;
1742 CondCode = PIC16CC::GE;
1745 CondCode = PIC16CC::UGE;
1748 CondCode = PIC16CC::ULE;
1753 PIC16CC = DAG.getConstant(CondCode, MVT::i8);
1755 // These are signed comparisons.
1756 SDValue Mask = DAG.getConstant(128, MVT::i8);
1757 if (isSignedComparison(CondCode)) {
1758 LHS = DAG.getNode (ISD::XOR, dl, MVT::i8, LHS, Mask);
1759 RHS = DAG.getNode (ISD::XOR, dl, MVT::i8, RHS, Mask);
1762 SDVTList VTs = DAG.getVTList (MVT::i8, MVT::Flag);
1763 // We can use a subtract operation to set the condition codes. But
1764 // we need to put one operand in memory if required.
1765 // Nothing to do if the first operand is already a valid type (direct load
1766 // for subwf and literal for sublw) and it is used by this operation only.
1767 if ((LHS.getOpcode() == ISD::Constant || isDirectLoad(LHS))
1769 return DAG.getNode(PIC16ISD::SUBCC, dl, VTs, LHS, RHS);
1771 // else convert the first operand to mem.
1772 LHS = ConvertToMemOperand (LHS, DAG, dl);
1773 return DAG.getNode(PIC16ISD::SUBCC, dl, VTs, LHS, RHS);
1777 SDValue PIC16TargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
1778 SDValue LHS = Op.getOperand(0);
1779 SDValue RHS = Op.getOperand(1);
1780 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1781 SDValue TrueVal = Op.getOperand(2);
1782 SDValue FalseVal = Op.getOperand(3);
1783 unsigned ORIGCC = ~0;
1784 DebugLoc dl = Op.getDebugLoc();
1786 // If this is a select_cc of a "setcc", and if the setcc got lowered into
1787 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
1789 // A setcc: lhs, rhs, cc is expanded by llvm to
1790 // select_cc: result of setcc, 0, 1, 0, setne
1791 // We can think of it as:
1792 // select_cc: lhs, rhs, 1, 0, cc
1793 LookThroughSetCC(LHS, RHS, CC, ORIGCC);
1794 if (ORIGCC == ~0U) ORIGCC = IntCCToPIC16CC (CC);
1797 SDValue Cmp = getPIC16Cmp(LHS, RHS, ORIGCC, PIC16CC, DAG, dl);
1799 return DAG.getNode (PIC16ISD::SELECT_ICC, dl, TrueVal.getValueType(), TrueVal,
1800 FalseVal, PIC16CC, Cmp.getValue(1));
1804 PIC16TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1805 MachineBasicBlock *BB) const {
1806 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
1807 unsigned CC = (PIC16CC::CondCodes)MI->getOperand(3).getImm();
1808 DebugLoc dl = MI->getDebugLoc();
1810 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
1811 // control-flow pattern. The incoming instruction knows the destination vreg
1812 // to set, the condition code register to branch on, the true/false values to
1813 // select between, and a branch opcode to use.
1814 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1815 MachineFunction::iterator It = BB;
1822 // fallthrough --> copy0MBB
1823 MachineBasicBlock *thisMBB = BB;
1824 MachineFunction *F = BB->getParent();
1825 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1826 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
1827 BuildMI(BB, dl, TII.get(PIC16::pic16brcond)).addMBB(sinkMBB).addImm(CC);
1828 F->insert(It, copy0MBB);
1829 F->insert(It, sinkMBB);
1831 // Update machine-CFG edges by transferring all successors of the current
1832 // block to the new block which will contain the Phi node for the select.
1833 sinkMBB->transferSuccessors(BB);
1834 // Next, add the true and fallthrough blocks as its successors.
1835 BB->addSuccessor(copy0MBB);
1836 BB->addSuccessor(sinkMBB);
1839 // %FalseValue = ...
1840 // # fallthrough to sinkMBB
1843 // Update machine-CFG edges
1844 BB->addSuccessor(sinkMBB);
1847 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1850 BuildMI(BB, dl, TII.get(PIC16::PHI), MI->getOperand(0).getReg())
1851 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
1852 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
1854 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
1859 SDValue PIC16TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
1860 SDValue Chain = Op.getOperand(0);
1861 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1862 SDValue LHS = Op.getOperand(2); // LHS of the condition.
1863 SDValue RHS = Op.getOperand(3); // RHS of the condition.
1864 SDValue Dest = Op.getOperand(4); // BB to jump to
1865 unsigned ORIGCC = ~0;
1866 DebugLoc dl = Op.getDebugLoc();
1868 // If this is a br_cc of a "setcc", and if the setcc got lowered into
1869 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
1870 LookThroughSetCC(LHS, RHS, CC, ORIGCC);
1871 if (ORIGCC == ~0U) ORIGCC = IntCCToPIC16CC (CC);
1873 // Get the Compare insn and condition code.
1875 SDValue Cmp = getPIC16Cmp(LHS, RHS, ORIGCC, PIC16CC, DAG, dl);
1877 return DAG.getNode(PIC16ISD::BRCOND, dl, MVT::Other, Chain, Dest, PIC16CC,