1 //===-- SparcISelDAGToDAG.cpp - A dag to dag inst selector for Sparc ------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines an instruction selector for the SPARC target.
12 //===----------------------------------------------------------------------===//
15 #include "SparcTargetMachine.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/Function.h"
18 #include "llvm/Intrinsics.h"
19 #include "llvm/CodeGen/MachineFrameInfo.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 #include "llvm/CodeGen/SelectionDAG.h"
23 #include "llvm/CodeGen/SelectionDAGISel.h"
24 #include "llvm/CodeGen/SSARegMap.h"
25 #include "llvm/Target/TargetLowering.h"
26 #include "llvm/Support/Debug.h"
31 //===----------------------------------------------------------------------===//
32 // TargetLowering Implementation
33 //===----------------------------------------------------------------------===//
37 FIRST_NUMBER = ISD::BUILTIN_OP_END+SP::INSTRUCTION_LIST_END,
38 CMPICC, // Compare two GPR operands, set icc.
39 CMPFCC, // Compare two FP operands, set fcc.
40 BRICC, // Branch to dest on icc condition
41 BRFCC, // Branch to dest on fcc condition
42 SELECT_ICC, // Select between two values using the current ICC flags.
43 SELECT_FCC, // Select between two values using the current FCC flags.
45 Hi, Lo, // Hi/Lo operations, typically on a global address.
47 FTOI, // FP to Int within a FP register.
48 ITOF, // Int to FP within a FP register.
50 CALL, // A call instruction.
51 RET_FLAG // Return with a flag operand.
55 /// IntCondCCodeToICC - Convert a DAG integer condition code to a SPARC ICC
57 static SPCC::CondCodes IntCondCCodeToICC(ISD::CondCode CC) {
59 default: assert(0 && "Unknown integer condition code!");
60 case ISD::SETEQ: return SPCC::ICC_E;
61 case ISD::SETNE: return SPCC::ICC_NE;
62 case ISD::SETLT: return SPCC::ICC_L;
63 case ISD::SETGT: return SPCC::ICC_G;
64 case ISD::SETLE: return SPCC::ICC_LE;
65 case ISD::SETGE: return SPCC::ICC_GE;
66 case ISD::SETULT: return SPCC::ICC_CS;
67 case ISD::SETULE: return SPCC::ICC_LEU;
68 case ISD::SETUGT: return SPCC::ICC_GU;
69 case ISD::SETUGE: return SPCC::ICC_CC;
73 /// FPCondCCodeToFCC - Convert a DAG floatingp oint condition code to a SPARC
75 static SPCC::CondCodes FPCondCCodeToFCC(ISD::CondCode CC) {
77 default: assert(0 && "Unknown fp condition code!");
79 case ISD::SETOEQ: return SPCC::FCC_E;
81 case ISD::SETUNE: return SPCC::FCC_NE;
83 case ISD::SETOLT: return SPCC::FCC_L;
85 case ISD::SETOGT: return SPCC::FCC_G;
87 case ISD::SETOLE: return SPCC::FCC_LE;
89 case ISD::SETOGE: return SPCC::FCC_GE;
90 case ISD::SETULT: return SPCC::FCC_UL;
91 case ISD::SETULE: return SPCC::FCC_ULE;
92 case ISD::SETUGT: return SPCC::FCC_UG;
93 case ISD::SETUGE: return SPCC::FCC_UGE;
94 case ISD::SETUO: return SPCC::FCC_U;
95 case ISD::SETO: return SPCC::FCC_O;
96 case ISD::SETONE: return SPCC::FCC_LG;
97 case ISD::SETUEQ: return SPCC::FCC_UE;
102 class SparcTargetLowering : public TargetLowering {
103 int VarArgsFrameOffset; // Frame offset to start of varargs area.
105 SparcTargetLowering(TargetMachine &TM);
106 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
108 /// computeMaskedBitsForTargetNode - Determine which of the bits specified
109 /// in Mask are known to be either zero or one and return them in the
110 /// KnownZero/KnownOne bitsets.
111 virtual void computeMaskedBitsForTargetNode(const SDOperand Op,
115 unsigned Depth = 0) const;
117 virtual std::vector<SDOperand>
118 LowerArguments(Function &F, SelectionDAG &DAG);
119 virtual std::pair<SDOperand, SDOperand>
120 LowerCallTo(SDOperand Chain, const Type *RetTy, bool RetTyIsSigned,
121 bool isVarArg, unsigned CC, bool isTailCall, SDOperand Callee,
122 ArgListTy &Args, SelectionDAG &DAG);
123 virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI,
124 MachineBasicBlock *MBB);
126 virtual const char *getTargetNodeName(unsigned Opcode) const;
130 SparcTargetLowering::SparcTargetLowering(TargetMachine &TM)
131 : TargetLowering(TM) {
133 // Set up the register classes.
134 addRegisterClass(MVT::i32, SP::IntRegsRegisterClass);
135 addRegisterClass(MVT::f32, SP::FPRegsRegisterClass);
136 addRegisterClass(MVT::f64, SP::DFPRegsRegisterClass);
138 // Turn FP extload into load/fextend
139 setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand);
141 // Custom legalize GlobalAddress nodes into LO/HI parts.
142 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
143 setOperationAction(ISD::ConstantPool , MVT::i32, Custom);
145 // Sparc doesn't have sext_inreg, replace them with shl/sra
146 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
147 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand);
148 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
150 // Sparc has no REM operation.
151 setOperationAction(ISD::UREM, MVT::i32, Expand);
152 setOperationAction(ISD::SREM, MVT::i32, Expand);
154 // Custom expand fp<->sint
155 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
156 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
159 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
160 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
162 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
163 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
165 // Sparc has no select or setcc: expand to SELECT_CC.
166 setOperationAction(ISD::SELECT, MVT::i32, Expand);
167 setOperationAction(ISD::SELECT, MVT::f32, Expand);
168 setOperationAction(ISD::SELECT, MVT::f64, Expand);
169 setOperationAction(ISD::SETCC, MVT::i32, Expand);
170 setOperationAction(ISD::SETCC, MVT::f32, Expand);
171 setOperationAction(ISD::SETCC, MVT::f64, Expand);
173 // Sparc doesn't have BRCOND either, it has BR_CC.
174 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
175 setOperationAction(ISD::BRIND, MVT::Other, Expand);
176 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
177 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
178 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
179 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
181 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
182 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
183 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
185 // SPARC has no intrinsics for these particular operations.
186 setOperationAction(ISD::MEMMOVE, MVT::Other, Expand);
187 setOperationAction(ISD::MEMSET, MVT::Other, Expand);
188 setOperationAction(ISD::MEMCPY, MVT::Other, Expand);
190 setOperationAction(ISD::FSIN , MVT::f64, Expand);
191 setOperationAction(ISD::FCOS , MVT::f64, Expand);
192 setOperationAction(ISD::FSIN , MVT::f32, Expand);
193 setOperationAction(ISD::FCOS , MVT::f32, Expand);
194 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
195 setOperationAction(ISD::CTTZ , MVT::i32, Expand);
196 setOperationAction(ISD::CTLZ , MVT::i32, Expand);
197 setOperationAction(ISD::ROTL , MVT::i32, Expand);
198 setOperationAction(ISD::ROTR , MVT::i32, Expand);
199 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
200 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
201 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
203 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
204 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
205 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
207 // We don't have line number support yet.
208 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
209 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
210 setOperationAction(ISD::LABEL, MVT::Other, Expand);
212 // RET must be custom lowered, to meet ABI requirements
213 setOperationAction(ISD::RET , MVT::Other, Custom);
215 // VASTART needs to be custom lowered to use the VarArgsFrameIndex.
216 setOperationAction(ISD::VASTART , MVT::Other, Custom);
217 // VAARG needs to be lowered to not do unaligned accesses for doubles.
218 setOperationAction(ISD::VAARG , MVT::Other, Custom);
220 // Use the default implementation.
221 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
222 setOperationAction(ISD::VAEND , MVT::Other, Expand);
223 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
224 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
225 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
227 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
228 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
230 setStackPointerRegisterToSaveRestore(SP::O6);
232 if (TM.getSubtarget<SparcSubtarget>().isV9()) {
233 setOperationAction(ISD::CTPOP, MVT::i32, Legal);
236 computeRegisterProperties();
239 const char *SparcTargetLowering::getTargetNodeName(unsigned Opcode) const {
242 case SPISD::CMPICC: return "SPISD::CMPICC";
243 case SPISD::CMPFCC: return "SPISD::CMPFCC";
244 case SPISD::BRICC: return "SPISD::BRICC";
245 case SPISD::BRFCC: return "SPISD::BRFCC";
246 case SPISD::SELECT_ICC: return "SPISD::SELECT_ICC";
247 case SPISD::SELECT_FCC: return "SPISD::SELECT_FCC";
248 case SPISD::Hi: return "SPISD::Hi";
249 case SPISD::Lo: return "SPISD::Lo";
250 case SPISD::FTOI: return "SPISD::FTOI";
251 case SPISD::ITOF: return "SPISD::ITOF";
252 case SPISD::CALL: return "SPISD::CALL";
253 case SPISD::RET_FLAG: return "SPISD::RET_FLAG";
257 /// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to
258 /// be zero. Op is expected to be a target specific node. Used by DAG
260 void SparcTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op,
264 unsigned Depth) const {
265 uint64_t KnownZero2, KnownOne2;
266 KnownZero = KnownOne = 0; // Don't know anything.
268 switch (Op.getOpcode()) {
270 case SPISD::SELECT_ICC:
271 case SPISD::SELECT_FCC:
272 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
273 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2, Depth+1);
274 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
275 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
277 // Only known if known in both the LHS and RHS.
278 KnownOne &= KnownOne2;
279 KnownZero &= KnownZero2;
284 /// LowerArguments - V8 uses a very simple ABI, where all values are passed in
285 /// either one or two GPRs, including FP values. TODO: we should pass FP values
286 /// in FP registers for fastcc functions.
287 std::vector<SDOperand>
288 SparcTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
289 MachineFunction &MF = DAG.getMachineFunction();
290 SSARegMap *RegMap = MF.getSSARegMap();
291 std::vector<SDOperand> ArgValues;
293 static const unsigned ArgRegs[] = {
294 SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5
297 const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6;
298 unsigned ArgOffset = 68;
300 SDOperand Root = DAG.getRoot();
301 std::vector<SDOperand> OutChains;
303 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
304 MVT::ValueType ObjectVT = getValueType(I->getType());
307 default: assert(0 && "Unhandled argument type!");
312 if (I->use_empty()) { // Argument is dead.
313 if (CurArgReg < ArgRegEnd) ++CurArgReg;
314 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
315 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
316 unsigned VReg = RegMap->createVirtualRegister(&SP::IntRegsRegClass);
317 MF.addLiveIn(*CurArgReg++, VReg);
318 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
319 if (ObjectVT != MVT::i32) {
320 unsigned AssertOp = ISD::AssertSext;
321 Arg = DAG.getNode(AssertOp, MVT::i32, Arg,
322 DAG.getValueType(ObjectVT));
323 Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg);
325 ArgValues.push_back(Arg);
327 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
328 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
330 if (ObjectVT == MVT::i32) {
331 Load = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0);
333 ISD::LoadExtType LoadOp = ISD::SEXTLOAD;
335 // Sparc is big endian, so add an offset based on the ObjectVT.
336 unsigned Offset = 4-std::max(1U, MVT::getSizeInBits(ObjectVT)/8);
337 FIPtr = DAG.getNode(ISD::ADD, MVT::i32, FIPtr,
338 DAG.getConstant(Offset, MVT::i32));
339 Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr,
341 Load = DAG.getNode(ISD::TRUNCATE, ObjectVT, Load);
343 ArgValues.push_back(Load);
349 if (I->use_empty()) { // Argument is dead.
350 if (CurArgReg < ArgRegEnd) ++CurArgReg;
351 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
352 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
353 // FP value is passed in an integer register.
354 unsigned VReg = RegMap->createVirtualRegister(&SP::IntRegsRegClass);
355 MF.addLiveIn(*CurArgReg++, VReg);
356 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
358 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Arg);
359 ArgValues.push_back(Arg);
361 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
362 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
363 SDOperand Load = DAG.getLoad(MVT::f32, Root, FIPtr, NULL, 0);
364 ArgValues.push_back(Load);
371 if (I->use_empty()) { // Argument is dead.
372 if (CurArgReg < ArgRegEnd) ++CurArgReg;
373 if (CurArgReg < ArgRegEnd) ++CurArgReg;
374 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
375 } else if (/* FIXME: Apparently this isn't safe?? */
376 0 && CurArgReg == ArgRegEnd && ObjectVT == MVT::f64 &&
377 ((CurArgReg-ArgRegs) & 1) == 0) {
378 // If this is a double argument and the whole thing lives on the stack,
379 // and the argument is aligned, load the double straight from the stack.
380 // We can't do a load in cases like void foo([6ints], int,double),
381 // because the double wouldn't be aligned!
382 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset);
383 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
384 ArgValues.push_back(DAG.getLoad(MVT::f64, Root, FIPtr, NULL, 0));
387 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
388 unsigned VRegHi = RegMap->createVirtualRegister(&SP::IntRegsRegClass);
389 MF.addLiveIn(*CurArgReg++, VRegHi);
390 HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32);
392 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
393 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
394 HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0);
398 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
399 unsigned VRegLo = RegMap->createVirtualRegister(&SP::IntRegsRegClass);
400 MF.addLiveIn(*CurArgReg++, VRegLo);
401 LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32);
403 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4);
404 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
405 LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0);
408 // Compose the two halves together into an i64 unit.
409 SDOperand WholeValue =
410 DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal);
412 // If we want a double, do a bit convert.
413 if (ObjectVT == MVT::f64)
414 WholeValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, WholeValue);
416 ArgValues.push_back(WholeValue);
423 // Store remaining ArgRegs to the stack if this is a varargs function.
424 if (F.getFunctionType()->isVarArg()) {
425 // Remember the vararg offset for the va_start implementation.
426 VarArgsFrameOffset = ArgOffset;
428 for (; CurArgReg != ArgRegEnd; ++CurArgReg) {
429 unsigned VReg = RegMap->createVirtualRegister(&SP::IntRegsRegClass);
430 MF.addLiveIn(*CurArgReg, VReg);
431 SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
433 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
434 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
436 OutChains.push_back(DAG.getStore(DAG.getRoot(), Arg, FIPtr, NULL, 0));
441 if (!OutChains.empty())
442 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other,
443 &OutChains[0], OutChains.size()));
445 // Finally, inform the code generator which regs we return values in.
446 switch (getValueType(F.getReturnType())) {
447 default: assert(0 && "Unknown type!");
448 case MVT::isVoid: break;
453 MF.addLiveOut(SP::I0);
456 MF.addLiveOut(SP::I0);
457 MF.addLiveOut(SP::I1);
460 MF.addLiveOut(SP::F0);
463 MF.addLiveOut(SP::D0);
470 std::pair<SDOperand, SDOperand>
471 SparcTargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy,
472 bool RetTyIsSigned, bool isVarArg, unsigned CC,
473 bool isTailCall, SDOperand Callee,
474 ArgListTy &Args, SelectionDAG &DAG) {
475 // Count the size of the outgoing arguments.
476 unsigned ArgsSize = 0;
477 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
478 switch (getValueType(Args[i].Ty)) {
479 default: assert(0 && "Unknown value type!");
494 ArgsSize -= 4*6; // Space for first 6 arguments is prereserved.
498 // Keep stack frames 8-byte aligned.
499 ArgsSize = (ArgsSize+7) & ~7;
501 Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(ArgsSize, getPointerTy()));
504 std::vector<SDOperand> Stores;
505 std::vector<SDOperand> RegValuesToPass;
506 unsigned ArgOffset = 68;
507 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
508 SDOperand Val = Args[i].Node;
509 MVT::ValueType ObjectVT = Val.getValueType();
510 SDOperand ValToStore(0, 0);
513 default: assert(0 && "Unhandled argument type!");
517 // Promote the integer to 32-bits. If the input type is signed, use a
518 // sign extend, otherwise use a zero extend.
519 ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
521 ExtendKind = ISD::SIGN_EXTEND;
522 else if (Args[i].isZExt)
523 ExtendKind = ISD::ZERO_EXTEND;
524 Val = DAG.getNode(ExtendKind, MVT::i32, Val);
530 if (RegValuesToPass.size() >= 6) {
533 RegValuesToPass.push_back(Val);
538 if (RegValuesToPass.size() >= 6) {
541 // Convert this to a FP value in an int reg.
542 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
543 RegValuesToPass.push_back(Val);
548 // If we can store this directly into the outgoing slot, do so. We can
549 // do this when all ArgRegs are used and if the outgoing slot is aligned.
550 // FIXME: McGill/misr fails with this.
551 if (0 && RegValuesToPass.size() >= 6 && ((ArgOffset-68) & 7) == 0) {
556 // Otherwise, convert this to a FP value in int regs.
557 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Val);
561 if (RegValuesToPass.size() >= 6) {
562 ValToStore = Val; // Whole thing is passed in memory.
566 // Split the value into top and bottom part. Top part goes in a reg.
567 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, getPointerTy(), Val,
568 DAG.getConstant(1, MVT::i32));
569 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, getPointerTy(), Val,
570 DAG.getConstant(0, MVT::i32));
571 RegValuesToPass.push_back(Hi);
573 if (RegValuesToPass.size() >= 6) {
578 RegValuesToPass.push_back(Lo);
583 if (ValToStore.Val) {
585 StackPtr = DAG.getRegister(SP::O6, MVT::i32);
587 SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
588 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
589 Stores.push_back(DAG.getStore(Chain, ValToStore, PtrOff, NULL, 0));
591 ArgOffset += ObjSize;
594 // Emit all stores, make sure the occur before any copies into physregs.
596 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &Stores[0],Stores.size());
598 static const unsigned ArgRegs[] = {
599 SP::O0, SP::O1, SP::O2, SP::O3, SP::O4, SP::O5
602 // Build a sequence of copy-to-reg nodes chained together with token chain
603 // and flag operands which copy the outgoing args into O[0-5].
605 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
606 Chain = DAG.getCopyToReg(Chain, ArgRegs[i], RegValuesToPass[i], InFlag);
607 InFlag = Chain.getValue(1);
610 // If the callee is a GlobalAddress node (quite common, every direct call is)
611 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
612 // Likewise ExternalSymbol -> TargetExternalSymbol.
613 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
614 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
615 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
616 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32);
618 std::vector<MVT::ValueType> NodeTys;
619 NodeTys.push_back(MVT::Other); // Returns a chain
620 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
621 SDOperand Ops[] = { Chain, Callee, InFlag };
622 Chain = DAG.getNode(SPISD::CALL, NodeTys, Ops, InFlag.Val ? 3 : 2);
623 InFlag = Chain.getValue(1);
625 MVT::ValueType RetTyVT = getValueType(RetTy);
627 if (RetTyVT != MVT::isVoid) {
629 default: assert(0 && "Unknown value type to return!");
633 RetVal = DAG.getCopyFromReg(Chain, SP::O0, MVT::i32, InFlag);
634 Chain = RetVal.getValue(1);
636 // Add a note to keep track of whether it is sign or zero extended.
637 ISD::NodeType AssertKind = ISD::AssertZext;
639 AssertKind = ISD::AssertSext;
640 RetVal = DAG.getNode(AssertKind, MVT::i32, RetVal,
641 DAG.getValueType(RetTyVT));
642 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
646 RetVal = DAG.getCopyFromReg(Chain, SP::O0, MVT::i32, InFlag);
647 Chain = RetVal.getValue(1);
650 RetVal = DAG.getCopyFromReg(Chain, SP::F0, MVT::f32, InFlag);
651 Chain = RetVal.getValue(1);
654 RetVal = DAG.getCopyFromReg(Chain, SP::D0, MVT::f64, InFlag);
655 Chain = RetVal.getValue(1);
658 SDOperand Lo = DAG.getCopyFromReg(Chain, SP::O1, MVT::i32, InFlag);
659 SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), SP::O0, MVT::i32,
661 RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
662 Chain = Hi.getValue(1);
667 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
668 DAG.getConstant(ArgsSize, getPointerTy()));
670 return std::make_pair(RetVal, Chain);
673 // Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so
674 // set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition.
675 static void LookThroughSetCC(SDOperand &LHS, SDOperand &RHS,
676 ISD::CondCode CC, unsigned &SPCC) {
677 if (isa<ConstantSDNode>(RHS) && cast<ConstantSDNode>(RHS)->getValue() == 0 &&
679 ((LHS.getOpcode() == SPISD::SELECT_ICC &&
680 LHS.getOperand(3).getOpcode() == SPISD::CMPICC) ||
681 (LHS.getOpcode() == SPISD::SELECT_FCC &&
682 LHS.getOperand(3).getOpcode() == SPISD::CMPFCC)) &&
683 isa<ConstantSDNode>(LHS.getOperand(0)) &&
684 isa<ConstantSDNode>(LHS.getOperand(1)) &&
685 cast<ConstantSDNode>(LHS.getOperand(0))->getValue() == 1 &&
686 cast<ConstantSDNode>(LHS.getOperand(1))->getValue() == 0) {
687 SDOperand CMPCC = LHS.getOperand(3);
688 SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getValue();
689 LHS = CMPCC.getOperand(0);
690 RHS = CMPCC.getOperand(1);
695 SDOperand SparcTargetLowering::
696 LowerOperation(SDOperand Op, SelectionDAG &DAG) {
697 switch (Op.getOpcode()) {
698 default: assert(0 && "Should not custom lower this!");
699 case ISD::GlobalAddress: {
700 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
701 SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32);
702 SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, GA);
703 SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, GA);
704 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
706 case ISD::ConstantPool: {
707 Constant *C = cast<ConstantPoolSDNode>(Op)->getConstVal();
708 SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32,
709 cast<ConstantPoolSDNode>(Op)->getAlignment());
710 SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, CP);
711 SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, CP);
712 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
714 case ISD::FP_TO_SINT:
715 // Convert the fp value to integer in an FP register.
716 assert(Op.getValueType() == MVT::i32);
717 Op = DAG.getNode(SPISD::FTOI, MVT::f32, Op.getOperand(0));
718 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
719 case ISD::SINT_TO_FP: {
720 assert(Op.getOperand(0).getValueType() == MVT::i32);
721 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
722 // Convert the int value to FP in an FP register.
723 return DAG.getNode(SPISD::ITOF, Op.getValueType(), Tmp);
726 SDOperand Chain = Op.getOperand(0);
727 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
728 SDOperand LHS = Op.getOperand(2);
729 SDOperand RHS = Op.getOperand(3);
730 SDOperand Dest = Op.getOperand(4);
731 unsigned Opc, SPCC = ~0U;
733 // If this is a br_cc of a "setcc", and if the setcc got lowered into
734 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
735 LookThroughSetCC(LHS, RHS, CC, SPCC);
737 // Get the condition flag.
738 SDOperand CompareFlag;
739 if (LHS.getValueType() == MVT::i32) {
740 std::vector<MVT::ValueType> VTs;
741 VTs.push_back(MVT::i32);
742 VTs.push_back(MVT::Flag);
743 SDOperand Ops[2] = { LHS, RHS };
744 CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1);
745 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC);
748 CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS);
749 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC);
752 return DAG.getNode(Opc, MVT::Other, Chain, Dest,
753 DAG.getConstant(SPCC, MVT::i32), CompareFlag);
755 case ISD::SELECT_CC: {
756 SDOperand LHS = Op.getOperand(0);
757 SDOperand RHS = Op.getOperand(1);
758 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
759 SDOperand TrueVal = Op.getOperand(2);
760 SDOperand FalseVal = Op.getOperand(3);
761 unsigned Opc, SPCC = ~0U;
763 // If this is a select_cc of a "setcc", and if the setcc got lowered into
764 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
765 LookThroughSetCC(LHS, RHS, CC, SPCC);
767 SDOperand CompareFlag;
768 if (LHS.getValueType() == MVT::i32) {
769 std::vector<MVT::ValueType> VTs;
770 VTs.push_back(LHS.getValueType()); // subcc returns a value
771 VTs.push_back(MVT::Flag);
772 SDOperand Ops[2] = { LHS, RHS };
773 CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1);
774 Opc = SPISD::SELECT_ICC;
775 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC);
777 CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS);
778 Opc = SPISD::SELECT_FCC;
779 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC);
781 return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal,
782 DAG.getConstant(SPCC, MVT::i32), CompareFlag);
785 // vastart just stores the address of the VarArgsFrameIndex slot into the
786 // memory location argument.
787 SDOperand Offset = DAG.getNode(ISD::ADD, MVT::i32,
788 DAG.getRegister(SP::I6, MVT::i32),
789 DAG.getConstant(VarArgsFrameOffset, MVT::i32));
790 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
791 return DAG.getStore(Op.getOperand(0), Offset,
792 Op.getOperand(1), SV->getValue(), SV->getOffset());
795 SDNode *Node = Op.Val;
796 MVT::ValueType VT = Node->getValueType(0);
797 SDOperand InChain = Node->getOperand(0);
798 SDOperand VAListPtr = Node->getOperand(1);
799 SrcValueSDNode *SV = cast<SrcValueSDNode>(Node->getOperand(2));
800 SDOperand VAList = DAG.getLoad(getPointerTy(), InChain, VAListPtr,
801 SV->getValue(), SV->getOffset());
802 // Increment the pointer, VAList, to the next vaarg
803 SDOperand NextPtr = DAG.getNode(ISD::ADD, getPointerTy(), VAList,
804 DAG.getConstant(MVT::getSizeInBits(VT)/8,
806 // Store the incremented VAList to the legalized pointer
807 InChain = DAG.getStore(VAList.getValue(1), NextPtr,
808 VAListPtr, SV->getValue(), SV->getOffset());
809 // Load the actual argument out of the pointer VAList, unless this is an
811 if (VT != MVT::f64) {
812 return DAG.getLoad(VT, InChain, VAList, NULL, 0);
814 // Otherwise, load it as i64, then do a bitconvert.
815 SDOperand V = DAG.getLoad(MVT::i64, InChain, VAList, NULL, 0);
816 std::vector<MVT::ValueType> Tys;
817 Tys.push_back(MVT::f64);
818 Tys.push_back(MVT::Other);
819 // Bit-Convert the value to f64.
820 SDOperand Ops[2] = { DAG.getNode(ISD::BIT_CONVERT, MVT::f64, V),
822 return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops, 2);
825 case ISD::DYNAMIC_STACKALLOC: {
826 SDOperand Chain = Op.getOperand(0); // Legalize the chain.
827 SDOperand Size = Op.getOperand(1); // Legalize the size.
829 unsigned SPReg = SP::O6;
830 SDOperand SP = DAG.getCopyFromReg(Chain, SPReg, MVT::i32);
831 SDOperand NewSP = DAG.getNode(ISD::SUB, MVT::i32, SP, Size); // Value
832 Chain = DAG.getCopyToReg(SP.getValue(1), SPReg, NewSP); // Output chain
834 // The resultant pointer is actually 16 words from the bottom of the stack,
835 // to provide a register spill area.
836 SDOperand NewVal = DAG.getNode(ISD::ADD, MVT::i32, NewSP,
837 DAG.getConstant(96, MVT::i32));
838 std::vector<MVT::ValueType> Tys;
839 Tys.push_back(MVT::i32);
840 Tys.push_back(MVT::Other);
841 SDOperand Ops[2] = { NewVal, Chain };
842 return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops, 2);
847 switch(Op.getNumOperands()) {
849 assert(0 && "Do not know how to return this many arguments!");
852 return SDOperand(); // ret void is legal
855 switch(Op.getOperand(1).getValueType()) {
856 default: assert(0 && "Unknown type to return!");
857 case MVT::i32: ArgReg = SP::I0; break;
858 case MVT::f32: ArgReg = SP::F0; break;
859 case MVT::f64: ArgReg = SP::D0; break;
861 Copy = DAG.getCopyToReg(Op.getOperand(0), ArgReg, Op.getOperand(1),
866 Copy = DAG.getCopyToReg(Op.getOperand(0), SP::I0, Op.getOperand(3),
868 Copy = DAG.getCopyToReg(Copy, SP::I1, Op.getOperand(1), Copy.getValue(1));
871 return DAG.getNode(SPISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
873 // Frame & Return address. Currently unimplemented
874 case ISD::RETURNADDR: break;
875 case ISD::FRAMEADDR: break;
881 SparcTargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
882 MachineBasicBlock *BB) {
883 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
886 // Figure out the conditional branch opcode to use for this select_cc.
887 switch (MI->getOpcode()) {
888 default: assert(0 && "Unknown SELECT_CC!");
889 case SP::SELECT_CC_Int_ICC:
890 case SP::SELECT_CC_FP_ICC:
891 case SP::SELECT_CC_DFP_ICC:
892 BROpcode = SP::BCOND;
894 case SP::SELECT_CC_Int_FCC:
895 case SP::SELECT_CC_FP_FCC:
896 case SP::SELECT_CC_DFP_FCC:
897 BROpcode = SP::FBCOND;
901 CC = (SPCC::CondCodes)MI->getOperand(3).getImmedValue();
903 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
904 // control-flow pattern. The incoming instruction knows the destination vreg
905 // to set, the condition code register to branch on, the true/false values to
906 // select between, and a branch opcode to use.
907 const BasicBlock *LLVM_BB = BB->getBasicBlock();
908 ilist<MachineBasicBlock>::iterator It = BB;
915 // fallthrough --> copy0MBB
916 MachineBasicBlock *thisMBB = BB;
917 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
918 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
919 BuildMI(BB, TII.get(BROpcode)).addMBB(sinkMBB).addImm(CC);
920 MachineFunction *F = BB->getParent();
921 F->getBasicBlockList().insert(It, copy0MBB);
922 F->getBasicBlockList().insert(It, sinkMBB);
923 // Update machine-CFG edges by first adding all successors of the current
924 // block to the new block which will contain the Phi node for the select.
925 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
926 e = BB->succ_end(); i != e; ++i)
927 sinkMBB->addSuccessor(*i);
928 // Next, remove all successors of the current block, and add the true
929 // and fallthrough blocks as its successors.
930 while(!BB->succ_empty())
931 BB->removeSuccessor(BB->succ_begin());
932 BB->addSuccessor(copy0MBB);
933 BB->addSuccessor(sinkMBB);
937 // # fallthrough to sinkMBB
940 // Update machine-CFG edges
941 BB->addSuccessor(sinkMBB);
944 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
947 BuildMI(BB, TII.get(SP::PHI), MI->getOperand(0).getReg())
948 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
949 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
951 delete MI; // The pseudo instruction is gone now.
955 //===----------------------------------------------------------------------===//
956 // Instruction Selector Implementation
957 //===----------------------------------------------------------------------===//
959 //===--------------------------------------------------------------------===//
960 /// SparcDAGToDAGISel - SPARC specific code to select SPARC machine
961 /// instructions for SelectionDAG operations.
964 class SparcDAGToDAGISel : public SelectionDAGISel {
965 SparcTargetLowering Lowering;
967 /// Subtarget - Keep a pointer to the Sparc Subtarget around so that we can
968 /// make the right decision when generating code for different targets.
969 const SparcSubtarget &Subtarget;
971 SparcDAGToDAGISel(TargetMachine &TM)
972 : SelectionDAGISel(Lowering), Lowering(TM),
973 Subtarget(TM.getSubtarget<SparcSubtarget>()) {
976 SDNode *Select(SDOperand Op);
978 // Complex Pattern Selectors.
979 bool SelectADDRrr(SDOperand Op, SDOperand N, SDOperand &R1, SDOperand &R2);
980 bool SelectADDRri(SDOperand Op, SDOperand N, SDOperand &Base,
983 /// InstructionSelectBasicBlock - This callback is invoked by
984 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
985 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
987 virtual const char *getPassName() const {
988 return "SPARC DAG->DAG Pattern Instruction Selection";
991 // Include the pieces autogenerated from the target description.
992 #include "SparcGenDAGISel.inc"
994 } // end anonymous namespace
996 /// InstructionSelectBasicBlock - This callback is invoked by
997 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
998 void SparcDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
1001 // Select target instructions for the DAG.
1002 DAG.setRoot(SelectRoot(DAG.getRoot()));
1003 DAG.RemoveDeadNodes();
1005 // Emit machine code to BB.
1006 ScheduleAndEmitDAG(DAG);
1009 bool SparcDAGToDAGISel::SelectADDRri(SDOperand Op, SDOperand Addr,
1010 SDOperand &Base, SDOperand &Offset) {
1011 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
1012 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
1013 Offset = CurDAG->getTargetConstant(0, MVT::i32);
1016 if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
1017 Addr.getOpcode() == ISD::TargetGlobalAddress)
1018 return false; // direct calls.
1020 if (Addr.getOpcode() == ISD::ADD) {
1021 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) {
1022 if (Predicate_simm13(CN)) {
1023 if (FrameIndexSDNode *FIN =
1024 dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
1025 // Constant offset from frame ref.
1026 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
1028 Base = Addr.getOperand(0);
1030 Offset = CurDAG->getTargetConstant(CN->getValue(), MVT::i32);
1034 if (Addr.getOperand(0).getOpcode() == SPISD::Lo) {
1035 Base = Addr.getOperand(1);
1036 Offset = Addr.getOperand(0).getOperand(0);
1039 if (Addr.getOperand(1).getOpcode() == SPISD::Lo) {
1040 Base = Addr.getOperand(0);
1041 Offset = Addr.getOperand(1).getOperand(0);
1046 Offset = CurDAG->getTargetConstant(0, MVT::i32);
1050 bool SparcDAGToDAGISel::SelectADDRrr(SDOperand Op, SDOperand Addr,
1051 SDOperand &R1, SDOperand &R2) {
1052 if (Addr.getOpcode() == ISD::FrameIndex) return false;
1053 if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
1054 Addr.getOpcode() == ISD::TargetGlobalAddress)
1055 return false; // direct calls.
1057 if (Addr.getOpcode() == ISD::ADD) {
1058 if (isa<ConstantSDNode>(Addr.getOperand(1)) &&
1059 Predicate_simm13(Addr.getOperand(1).Val))
1060 return false; // Let the reg+imm pattern catch this!
1061 if (Addr.getOperand(0).getOpcode() == SPISD::Lo ||
1062 Addr.getOperand(1).getOpcode() == SPISD::Lo)
1063 return false; // Let the reg+imm pattern catch this!
1064 R1 = Addr.getOperand(0);
1065 R2 = Addr.getOperand(1);
1070 R2 = CurDAG->getRegister(SP::G0, MVT::i32);
1074 SDNode *SparcDAGToDAGISel::Select(SDOperand Op) {
1076 if (N->getOpcode() >= ISD::BUILTIN_OP_END &&
1077 N->getOpcode() < SPISD::FIRST_NUMBER)
1078 return NULL; // Already selected.
1080 switch (N->getOpcode()) {
1084 // FIXME: should use a custom expander to expose the SRA to the dag.
1085 SDOperand DivLHS = N->getOperand(0);
1086 SDOperand DivRHS = N->getOperand(1);
1087 AddToISelQueue(DivLHS);
1088 AddToISelQueue(DivRHS);
1090 // Set the Y register to the high-part.
1092 if (N->getOpcode() == ISD::SDIV) {
1093 TopPart = SDOperand(CurDAG->getTargetNode(SP::SRAri, MVT::i32, DivLHS,
1094 CurDAG->getTargetConstant(31, MVT::i32)), 0);
1096 TopPart = CurDAG->getRegister(SP::G0, MVT::i32);
1098 TopPart = SDOperand(CurDAG->getTargetNode(SP::WRYrr, MVT::Flag, TopPart,
1099 CurDAG->getRegister(SP::G0, MVT::i32)), 0);
1101 // FIXME: Handle div by immediate.
1102 unsigned Opcode = N->getOpcode() == ISD::SDIV ? SP::SDIVrr : SP::UDIVrr;
1103 return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS,
1108 // FIXME: Handle mul by immediate.
1109 SDOperand MulLHS = N->getOperand(0);
1110 SDOperand MulRHS = N->getOperand(1);
1111 AddToISelQueue(MulLHS);
1112 AddToISelQueue(MulRHS);
1113 unsigned Opcode = N->getOpcode() == ISD::MULHU ? SP::UMULrr : SP::SMULrr;
1114 SDNode *Mul = CurDAG->getTargetNode(Opcode, MVT::i32, MVT::Flag,
1116 // The high part is in the Y register.
1117 return CurDAG->SelectNodeTo(N, SP::RDY, MVT::i32, SDOperand(Mul, 1));
1122 return SelectCode(Op);
1126 /// createSparcISelDag - This pass converts a legalized DAG into a
1127 /// SPARC-specific DAG, ready for instruction scheduling.
1129 FunctionPass *llvm::createSparcISelDag(TargetMachine &TM) {
1130 return new SparcDAGToDAGISel(TM);