1 //===-- SparcV8ISelDAGToDAG.cpp - A dag to dag inst selector for SparcV8 --===//
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 V8 target
12 //===----------------------------------------------------------------------===//
15 #include "SparcV8TargetMachine.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/Function.h"
18 #include "llvm/CodeGen/MachineFrameInfo.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineInstrBuilder.h"
21 #include "llvm/CodeGen/SelectionDAG.h"
22 #include "llvm/CodeGen/SelectionDAGISel.h"
23 #include "llvm/CodeGen/SSARegMap.h"
24 #include "llvm/Target/TargetLowering.h"
25 #include "llvm/Support/Debug.h"
29 //===----------------------------------------------------------------------===//
30 // TargetLowering Implementation
31 //===----------------------------------------------------------------------===//
35 FIRST_NUMBER = ISD::BUILTIN_OP_END+V8::INSTRUCTION_LIST_END,
36 CMPICC, // Compare two GPR operands, set icc.
37 CMPFCC, // Compare two FP operands, set fcc.
38 BRICC, // Branch to dest on icc condition
39 BRFCC, // Branch to dest on fcc condition
41 Hi, Lo, // Hi/Lo operations, typically on a global address.
43 FTOI, // FP to Int within a FP register.
44 ITOF, // Int to FP within a FP register.
46 SELECT_ICC, // Select between two values using the current ICC flags.
47 SELECT_FCC, // Select between two values using the current FCC flags.
49 RET_FLAG, // Return with a flag operand.
54 class SparcV8TargetLowering : public TargetLowering {
55 int VarArgsFrameOffset; // Frame offset to start of varargs area.
57 SparcV8TargetLowering(TargetMachine &TM);
58 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
59 virtual std::vector<SDOperand>
60 LowerArguments(Function &F, SelectionDAG &DAG);
61 virtual std::pair<SDOperand, SDOperand>
62 LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg,
64 bool isTailCall, SDOperand Callee, ArgListTy &Args,
67 virtual SDOperand LowerReturnTo(SDOperand Chain, SDOperand Op,
69 virtual SDOperand LowerVAStart(SDOperand Chain, SDOperand VAListP,
70 Value *VAListV, SelectionDAG &DAG);
71 virtual std::pair<SDOperand,SDOperand>
72 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
73 const Type *ArgTy, SelectionDAG &DAG);
74 virtual std::pair<SDOperand, SDOperand>
75 LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
77 virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI,
78 MachineBasicBlock *MBB);
80 virtual const char *getTargetNodeName(unsigned Opcode) const;
84 SparcV8TargetLowering::SparcV8TargetLowering(TargetMachine &TM)
85 : TargetLowering(TM) {
87 // Set up the register classes.
88 addRegisterClass(MVT::i32, V8::IntRegsRegisterClass);
89 addRegisterClass(MVT::f32, V8::FPRegsRegisterClass);
90 addRegisterClass(MVT::f64, V8::DFPRegsRegisterClass);
92 // Custom legalize GlobalAddress nodes into LO/HI parts.
93 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
94 setOperationAction(ISD::ConstantPool , MVT::i32, Custom);
96 // Sparc doesn't have sext_inreg, replace them with shl/sra
97 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
98 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand);
99 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
101 // Sparc has no REM operation.
102 setOperationAction(ISD::UREM, MVT::i32, Expand);
103 setOperationAction(ISD::SREM, MVT::i32, Expand);
105 // Custom expand fp<->sint
106 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
107 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
110 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
111 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
113 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
114 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
116 // Turn FP extload into load/fextend
117 setOperationAction(ISD::EXTLOAD, MVT::f32, Expand);
119 // Sparc has no select or setcc: expand to SELECT_CC.
120 setOperationAction(ISD::SELECT, MVT::i32, Expand);
121 setOperationAction(ISD::SELECT, MVT::f32, Expand);
122 setOperationAction(ISD::SELECT, MVT::f64, Expand);
123 setOperationAction(ISD::SETCC, MVT::i32, Expand);
124 setOperationAction(ISD::SETCC, MVT::f32, Expand);
125 setOperationAction(ISD::SETCC, MVT::f64, Expand);
127 // Sparc doesn't have BRCOND either, it has BR_CC.
128 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
129 setOperationAction(ISD::BRCONDTWOWAY, MVT::Other, Expand);
130 setOperationAction(ISD::BRTWOWAY_CC, MVT::Other, Expand);
131 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
132 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
133 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
135 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
136 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
137 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
139 // V8 has no intrinsics for these particular operations.
140 setOperationAction(ISD::MEMMOVE, MVT::Other, Expand);
141 setOperationAction(ISD::MEMSET, MVT::Other, Expand);
142 setOperationAction(ISD::MEMCPY, MVT::Other, Expand);
144 setOperationAction(ISD::FSIN , MVT::f64, Expand);
145 setOperationAction(ISD::FCOS , MVT::f64, Expand);
146 setOperationAction(ISD::FSIN , MVT::f32, Expand);
147 setOperationAction(ISD::FCOS , MVT::f32, Expand);
148 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
149 setOperationAction(ISD::CTTZ , MVT::i32, Expand);
150 setOperationAction(ISD::CTLZ , MVT::i32, Expand);
151 setOperationAction(ISD::ROTL , MVT::i32, Expand);
152 setOperationAction(ISD::ROTR , MVT::i32, Expand);
153 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
155 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
156 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
157 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
159 // We don't have line number support yet.
160 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
161 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
162 setOperationAction(ISD::DEBUG_LABEL, MVT::Other, Expand);
164 // Not implemented yet.
165 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
166 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
168 computeRegisterProperties();
171 const char *SparcV8TargetLowering::getTargetNodeName(unsigned Opcode) const {
174 case V8ISD::CMPICC: return "V8ISD::CMPICC";
175 case V8ISD::CMPFCC: return "V8ISD::CMPFCC";
176 case V8ISD::BRICC: return "V8ISD::BRICC";
177 case V8ISD::BRFCC: return "V8ISD::BRFCC";
178 case V8ISD::Hi: return "V8ISD::Hi";
179 case V8ISD::Lo: return "V8ISD::Lo";
180 case V8ISD::FTOI: return "V8ISD::FTOI";
181 case V8ISD::ITOF: return "V8ISD::ITOF";
182 case V8ISD::SELECT_ICC: return "V8ISD::SELECT_ICC";
183 case V8ISD::SELECT_FCC: return "V8ISD::SELECT_FCC";
184 case V8ISD::RET_FLAG: return "V8ISD::RET_FLAG";
188 /// LowerArguments - V8 uses a very simple ABI, where all values are passed in
189 /// either one or two GPRs, including FP values. TODO: we should pass FP values
190 /// in FP registers for fastcc functions.
191 std::vector<SDOperand>
192 SparcV8TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
193 MachineFunction &MF = DAG.getMachineFunction();
194 SSARegMap *RegMap = MF.getSSARegMap();
195 std::vector<SDOperand> ArgValues;
197 static const unsigned ArgRegs[] = {
198 V8::I0, V8::I1, V8::I2, V8::I3, V8::I4, V8::I5
201 const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6;
202 unsigned ArgOffset = 68;
204 SDOperand Root = DAG.getRoot();
205 std::vector<SDOperand> OutChains;
207 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
208 MVT::ValueType ObjectVT = getValueType(I->getType());
211 default: assert(0 && "Unhandled argument type!");
216 if (I->use_empty()) { // Argument is dead.
217 if (CurArgReg < ArgRegEnd) ++CurArgReg;
218 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
219 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
220 unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
221 MF.addLiveIn(*CurArgReg++, VReg);
222 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
223 if (ObjectVT != MVT::i32) {
224 unsigned AssertOp = I->getType()->isSigned() ? ISD::AssertSext
226 Arg = DAG.getNode(AssertOp, MVT::i32, Arg,
227 DAG.getValueType(ObjectVT));
228 Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg);
230 ArgValues.push_back(Arg);
232 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
233 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
235 if (ObjectVT == MVT::i32) {
236 Load = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
239 I->getType()->isSigned() ? ISD::SEXTLOAD : ISD::ZEXTLOAD;
241 Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr,
242 DAG.getSrcValue(0), ObjectVT);
244 ArgValues.push_back(Load);
250 if (I->use_empty()) { // Argument is dead.
251 if (CurArgReg < ArgRegEnd) ++CurArgReg;
252 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
253 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
254 // FP value is passed in an integer register.
255 unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
256 MF.addLiveIn(*CurArgReg++, VReg);
257 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
259 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Arg);
260 ArgValues.push_back(Arg);
267 if (I->use_empty()) { // Argument is dead.
268 if (CurArgReg < ArgRegEnd) ++CurArgReg;
269 if (CurArgReg < ArgRegEnd) ++CurArgReg;
270 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
271 } else if (CurArgReg == ArgRegEnd && ObjectVT == MVT::f64 &&
272 ((CurArgReg-ArgRegs) & 1) == 0) {
273 // If this is a double argument and the whole thing lives on the stack,
274 // and the argument is aligned, load the double straight from the stack.
275 // We can't do a load in cases like void foo([6ints], int,double),
276 // because the double wouldn't be aligned!
277 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset);
278 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
279 ArgValues.push_back(DAG.getLoad(MVT::f64, Root, FIPtr,
280 DAG.getSrcValue(0)));
283 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
284 unsigned VRegHi = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
285 MF.addLiveIn(*CurArgReg++, VRegHi);
286 HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32);
288 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
289 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
290 HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
294 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
295 unsigned VRegLo = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
296 MF.addLiveIn(*CurArgReg++, VRegLo);
297 LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32);
299 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4);
300 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
301 LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
304 // Compose the two halves together into an i64 unit.
305 SDOperand WholeValue =
306 DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal);
308 // If we want a double, do a bit convert.
309 if (ObjectVT == MVT::f64)
310 WholeValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, WholeValue);
312 ArgValues.push_back(WholeValue);
319 // Store remaining ArgRegs to the stack if this is a varargs function.
320 if (F.getFunctionType()->isVarArg()) {
321 // Remember the vararg offset for the va_start implementation.
322 VarArgsFrameOffset = ArgOffset;
324 for (; CurArgReg != ArgRegEnd; ++CurArgReg) {
325 unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
326 MF.addLiveIn(*CurArgReg, VReg);
327 SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
329 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
330 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
332 OutChains.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(),
333 Arg, FIPtr, DAG.getSrcValue(0)));
338 if (!OutChains.empty())
339 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, OutChains));
341 // Finally, inform the code generator which regs we return values in.
342 switch (getValueType(F.getReturnType())) {
343 default: assert(0 && "Unknown type!");
344 case MVT::isVoid: break;
349 MF.addLiveOut(V8::I0);
352 MF.addLiveOut(V8::I0);
353 MF.addLiveOut(V8::I1);
356 MF.addLiveOut(V8::F0);
359 MF.addLiveOut(V8::D0);
366 std::pair<SDOperand, SDOperand>
367 SparcV8TargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy,
368 bool isVarArg, unsigned CC,
369 bool isTailCall, SDOperand Callee,
370 ArgListTy &Args, SelectionDAG &DAG) {
371 MachineFunction &MF = DAG.getMachineFunction();
372 // Count the size of the outgoing arguments.
373 unsigned ArgsSize = 0;
374 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
375 switch (getValueType(Args[i].second)) {
376 default: assert(0 && "Unknown value type!");
391 ArgsSize -= 4*6; // Space for first 6 arguments is prereserved.
395 // Keep stack frames 8-byte aligned.
396 ArgsSize = (ArgsSize+7) & ~7;
398 Chain = DAG.getNode(ISD::CALLSEQ_START, MVT::Other, Chain,
399 DAG.getConstant(ArgsSize, getPointerTy()));
401 SDOperand StackPtr, NullSV;
402 std::vector<SDOperand> Stores;
403 std::vector<SDOperand> RegValuesToPass;
404 unsigned ArgOffset = 68;
405 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
406 SDOperand Val = Args[i].first;
407 MVT::ValueType ObjectVT = Val.getValueType();
408 SDOperand ValToStore(0, 0);
411 default: assert(0 && "Unhandled argument type!");
415 // Promote the integer to 32-bits. If the input type is signed, use a
416 // sign extend, otherwise use a zero extend.
417 if (Args[i].second->isSigned())
418 Val = DAG.getNode(ISD::SIGN_EXTEND, MVT::i32, Val);
420 Val = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Val);
425 if (RegValuesToPass.size() >= 6) {
428 RegValuesToPass.push_back(Val);
433 if (RegValuesToPass.size() >= 6) {
436 // Convert this to a FP value in an int reg.
437 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
438 RegValuesToPass.push_back(Val);
443 // If we can store this directly into the outgoing slot, do so. We can
444 // do this when all ArgRegs are used and if the outgoing slot is aligned.
445 if (RegValuesToPass.size() >= 6 && ((ArgOffset-68) & 7) == 0) {
450 // Otherwise, convert this to a FP value in int regs.
451 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Val);
455 if (RegValuesToPass.size() >= 6) {
456 ValToStore = Val; // Whole thing is passed in memory.
460 // Split the value into top and bottom part. Top part goes in a reg.
461 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
462 DAG.getConstant(1, MVT::i32));
463 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
464 DAG.getConstant(0, MVT::i32));
465 RegValuesToPass.push_back(Hi);
467 if (RegValuesToPass.size() >= 6) {
472 RegValuesToPass.push_back(Lo);
477 if (ValToStore.Val) {
479 StackPtr = DAG.getRegister(V8::O6, MVT::i32);
480 NullSV = DAG.getSrcValue(NULL);
482 SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
483 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
484 Stores.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
485 ValToStore, PtrOff, NullSV));
487 ArgOffset += ObjSize;
490 // Emit all stores, make sure the occur before any copies into physregs.
492 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, Stores);
494 static const unsigned ArgRegs[] = {
495 V8::O0, V8::O1, V8::O2, V8::O3, V8::O4, V8::O5
498 // Build a sequence of copy-to-reg nodes chained together with token chain
499 // and flag operands which copy the outgoing args into O[0-5].
501 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
502 Chain = DAG.getCopyToReg(Chain, ArgRegs[i], RegValuesToPass[i], InFlag);
503 InFlag = Chain.getValue(1);
506 // If the callee is a GlobalAddress node (quite common, every direct call is)
507 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
508 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
509 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
511 std::vector<MVT::ValueType> NodeTys;
512 NodeTys.push_back(MVT::Other); // Returns a chain
513 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
515 Chain = SDOperand(DAG.getCall(NodeTys, Chain, Callee, InFlag), 0);
517 Chain = SDOperand(DAG.getCall(NodeTys, Chain, Callee), 0);
518 InFlag = Chain.getValue(1);
520 MVT::ValueType RetTyVT = getValueType(RetTy);
522 if (RetTyVT != MVT::isVoid) {
524 default: assert(0 && "Unknown value type to return!");
528 RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag);
529 Chain = RetVal.getValue(1);
531 // Add a note to keep track of whether it is sign or zero extended.
532 RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext :ISD::AssertZext,
533 MVT::i32, RetVal, DAG.getValueType(RetTyVT));
534 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
537 RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag);
538 Chain = RetVal.getValue(1);
541 RetVal = DAG.getCopyFromReg(Chain, V8::F0, MVT::f32, InFlag);
542 Chain = RetVal.getValue(1);
545 RetVal = DAG.getCopyFromReg(Chain, V8::D0, MVT::f64, InFlag);
546 Chain = RetVal.getValue(1);
549 SDOperand Lo = DAG.getCopyFromReg(Chain, V8::O1, MVT::i32, InFlag);
550 SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), V8::O0, MVT::i32,
552 RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
553 Chain = Hi.getValue(1);
558 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
559 DAG.getConstant(ArgsSize, getPointerTy()));
561 return std::make_pair(RetVal, Chain);
564 SDOperand SparcV8TargetLowering::LowerReturnTo(SDOperand Chain, SDOperand Op,
567 switch (Op.getValueType()) {
568 default: assert(0 && "Unknown type to return!");
570 Copy = DAG.getCopyToReg(Chain, V8::I0, Op, SDOperand());
573 Copy = DAG.getCopyToReg(Chain, V8::F0, Op, SDOperand());
576 Copy = DAG.getCopyToReg(Chain, V8::D0, Op, SDOperand());
579 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
580 DAG.getConstant(1, MVT::i32));
581 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
582 DAG.getConstant(0, MVT::i32));
583 Copy = DAG.getCopyToReg(Chain, V8::I0, Hi, SDOperand());
584 Copy = DAG.getCopyToReg(Copy, V8::I1, Lo, Copy.getValue(1));
587 return DAG.getNode(V8ISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
590 SDOperand SparcV8TargetLowering::
591 LowerVAStart(SDOperand Chain, SDOperand VAListP, Value *VAListV,
594 SDOperand Offset = DAG.getNode(ISD::ADD, MVT::i32,
595 DAG.getRegister(V8::I6, MVT::i32),
596 DAG.getConstant(VarArgsFrameOffset, MVT::i32));
597 return DAG.getNode(ISD::STORE, MVT::Other, Chain, Offset,
598 VAListP, DAG.getSrcValue(VAListV));
601 std::pair<SDOperand,SDOperand> SparcV8TargetLowering::
602 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
603 const Type *ArgTy, SelectionDAG &DAG) {
604 // Load the pointer out of the valist.
605 SDOperand Ptr = DAG.getLoad(MVT::i32, Chain,
606 VAListP, DAG.getSrcValue(VAListV));
607 MVT::ValueType ArgVT = getValueType(ArgTy);
608 SDOperand Val = DAG.getLoad(ArgVT, Ptr.getValue(1),
609 Ptr, DAG.getSrcValue(NULL));
610 // Increment the pointer.
611 Ptr = DAG.getNode(ISD::ADD, MVT::i32, Ptr,
612 DAG.getConstant(MVT::getSizeInBits(ArgVT)/8, MVT::i32));
613 // Store it back to the valist.
614 Chain = DAG.getNode(ISD::STORE, MVT::Other, Chain, Ptr,
615 VAListP, DAG.getSrcValue(VAListV));
616 return std::make_pair(Val, Chain);
619 std::pair<SDOperand, SDOperand> SparcV8TargetLowering::
620 LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
622 assert(0 && "Unimp");
626 SDOperand SparcV8TargetLowering::
627 LowerOperation(SDOperand Op, SelectionDAG &DAG) {
628 switch (Op.getOpcode()) {
629 default: assert(0 && "Should not custom lower this!");
630 case ISD::GlobalAddress: {
631 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
632 SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32);
633 SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, GA);
634 SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, GA);
635 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
637 case ISD::ConstantPool: {
638 Constant *C = cast<ConstantPoolSDNode>(Op)->get();
639 SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32);
640 SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, CP);
641 SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, CP);
642 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
644 case ISD::FP_TO_SINT:
645 // Convert the fp value to integer in an FP register.
646 assert(Op.getValueType() == MVT::i32);
647 Op = DAG.getNode(V8ISD::FTOI, MVT::f32, Op.getOperand(0));
648 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
649 case ISD::SINT_TO_FP: {
650 assert(Op.getOperand(0).getValueType() == MVT::i32);
651 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
652 // Convert the int value to FP in an FP register.
653 return DAG.getNode(V8ISD::ITOF, Op.getValueType(), Tmp);
656 SDOperand Chain = Op.getOperand(0);
657 SDOperand CC = Op.getOperand(1);
658 SDOperand LHS = Op.getOperand(2);
659 SDOperand RHS = Op.getOperand(3);
660 SDOperand Dest = Op.getOperand(4);
662 // Get the condition flag.
663 if (LHS.getValueType() == MVT::i32) {
664 std::vector<MVT::ValueType> VTs;
665 VTs.push_back(MVT::i32);
666 VTs.push_back(MVT::Flag);
667 std::vector<SDOperand> Ops;
670 SDOperand Cond = DAG.getNode(V8ISD::CMPICC, VTs, Ops).getValue(1);
671 return DAG.getNode(V8ISD::BRICC, MVT::Other, Chain, Dest, CC, Cond);
673 SDOperand Cond = DAG.getNode(V8ISD::CMPFCC, MVT::Flag, LHS, RHS);
674 return DAG.getNode(V8ISD::BRFCC, MVT::Other, Chain, Dest, CC, Cond);
677 case ISD::SELECT_CC: {
678 SDOperand LHS = Op.getOperand(0);
679 SDOperand RHS = Op.getOperand(1);
680 unsigned CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
681 SDOperand TrueVal = Op.getOperand(2);
682 SDOperand FalseVal = Op.getOperand(3);
684 SDOperand CompareFlag;
686 if (LHS.getValueType() == MVT::i32) {
687 std::vector<MVT::ValueType> VTs;
688 VTs.push_back(LHS.getValueType()); // subcc returns a value
689 VTs.push_back(MVT::Flag);
690 std::vector<SDOperand> Ops;
693 CompareFlag = DAG.getNode(V8ISD::CMPICC, VTs, Ops).getValue(1);
694 Opc = V8ISD::SELECT_ICC;
696 CompareFlag = DAG.getNode(V8ISD::CMPFCC, MVT::Flag, LHS, RHS);
697 Opc = V8ISD::SELECT_FCC;
699 return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal,
700 DAG.getConstant(CC, MVT::i32), CompareFlag);
706 SparcV8TargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
707 MachineBasicBlock *BB) {
709 // Figure out the conditional branch opcode to use for this select_cc.
710 switch (MI->getOpcode()) {
711 default: assert(0 && "Unknown SELECT_CC!");
712 case V8::SELECT_CC_Int_ICC:
713 case V8::SELECT_CC_FP_ICC:
714 case V8::SELECT_CC_DFP_ICC:
716 switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) {
717 default: assert(0 && "Unknown integer condition code!");
718 case ISD::SETEQ: BROpcode = V8::BE; break;
719 case ISD::SETNE: BROpcode = V8::BNE; break;
720 case ISD::SETLT: BROpcode = V8::BL; break;
721 case ISD::SETGT: BROpcode = V8::BG; break;
722 case ISD::SETLE: BROpcode = V8::BLE; break;
723 case ISD::SETGE: BROpcode = V8::BGE; break;
724 case ISD::SETULT: BROpcode = V8::BCS; break;
725 case ISD::SETULE: BROpcode = V8::BLEU; break;
726 case ISD::SETUGT: BROpcode = V8::BGU; break;
727 case ISD::SETUGE: BROpcode = V8::BCC; break;
730 case V8::SELECT_CC_Int_FCC:
731 case V8::SELECT_CC_FP_FCC:
732 case V8::SELECT_CC_DFP_FCC:
734 switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) {
735 default: assert(0 && "Unknown fp condition code!");
736 case ISD::SETEQ: BROpcode = V8::FBE; break;
737 case ISD::SETNE: BROpcode = V8::FBNE; break;
738 case ISD::SETLT: BROpcode = V8::FBL; break;
739 case ISD::SETGT: BROpcode = V8::FBG; break;
740 case ISD::SETLE: BROpcode = V8::FBLE; break;
741 case ISD::SETGE: BROpcode = V8::FBGE; break;
742 case ISD::SETULT: BROpcode = V8::FBUL; break;
743 case ISD::SETULE: BROpcode = V8::FBULE; break;
744 case ISD::SETUGT: BROpcode = V8::FBUG; break;
745 case ISD::SETUGE: BROpcode = V8::FBUGE; break;
746 case ISD::SETUO: BROpcode = V8::FBU; break;
747 case ISD::SETO: BROpcode = V8::FBO; break;
748 case ISD::SETONE: BROpcode = V8::FBLG; break;
749 case ISD::SETUEQ: BROpcode = V8::FBUE; break;
754 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
755 // control-flow pattern. The incoming instruction knows the destination vreg
756 // to set, the condition code register to branch on, the true/false values to
757 // select between, and a branch opcode to use.
758 const BasicBlock *LLVM_BB = BB->getBasicBlock();
759 ilist<MachineBasicBlock>::iterator It = BB;
766 // fallthrough --> copy0MBB
767 MachineBasicBlock *thisMBB = BB;
768 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
769 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
770 BuildMI(BB, BROpcode, 1).addMBB(sinkMBB);
771 MachineFunction *F = BB->getParent();
772 F->getBasicBlockList().insert(It, copy0MBB);
773 F->getBasicBlockList().insert(It, sinkMBB);
774 // Update machine-CFG edges
775 BB->addSuccessor(copy0MBB);
776 BB->addSuccessor(sinkMBB);
780 // # fallthrough to sinkMBB
783 // Update machine-CFG edges
784 BB->addSuccessor(sinkMBB);
787 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
790 BuildMI(BB, V8::PHI, 4, MI->getOperand(0).getReg())
791 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
792 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
794 delete MI; // The pseudo instruction is gone now.
798 //===----------------------------------------------------------------------===//
799 // Instruction Selector Implementation
800 //===----------------------------------------------------------------------===//
802 //===--------------------------------------------------------------------===//
803 /// SparcV8DAGToDAGISel - PPC specific code to select Sparc V8 machine
804 /// instructions for SelectionDAG operations.
807 class SparcV8DAGToDAGISel : public SelectionDAGISel {
808 SparcV8TargetLowering V8Lowering;
810 SparcV8DAGToDAGISel(TargetMachine &TM)
811 : SelectionDAGISel(V8Lowering), V8Lowering(TM) {}
813 SDOperand Select(SDOperand Op);
815 // Complex Pattern Selectors.
816 bool SelectADDRrr(SDOperand N, SDOperand &R1, SDOperand &R2);
817 bool SelectADDRri(SDOperand N, SDOperand &Base, SDOperand &Offset);
819 /// InstructionSelectBasicBlock - This callback is invoked by
820 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
821 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
823 virtual const char *getPassName() const {
824 return "PowerPC DAG->DAG Pattern Instruction Selection";
827 // Include the pieces autogenerated from the target description.
828 #include "SparcV8GenDAGISel.inc"
830 } // end anonymous namespace
832 /// InstructionSelectBasicBlock - This callback is invoked by
833 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
834 void SparcV8DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
837 // Select target instructions for the DAG.
838 DAG.setRoot(Select(DAG.getRoot()));
840 DAG.RemoveDeadNodes();
842 // Emit machine code to BB.
843 ScheduleAndEmitDAG(DAG);
846 bool SparcV8DAGToDAGISel::SelectADDRri(SDOperand Addr, SDOperand &Base,
848 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
849 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
850 Offset = CurDAG->getTargetConstant(0, MVT::i32);
854 if (Addr.getOpcode() == ISD::ADD) {
855 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) {
856 if (Predicate_simm13(CN)) {
857 if (FrameIndexSDNode *FIN =
858 dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
859 // Constant offset from frame ref.
860 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
862 Base = Select(Addr.getOperand(0));
864 Offset = CurDAG->getTargetConstant(CN->getValue(), MVT::i32);
868 if (Addr.getOperand(0).getOpcode() == V8ISD::Lo) {
869 Base = Select(Addr.getOperand(1));
870 Offset = Addr.getOperand(0).getOperand(0);
873 if (Addr.getOperand(1).getOpcode() == V8ISD::Lo) {
874 Base = Select(Addr.getOperand(0));
875 Offset = Addr.getOperand(1).getOperand(0);
880 Offset = CurDAG->getTargetConstant(0, MVT::i32);
884 bool SparcV8DAGToDAGISel::SelectADDRrr(SDOperand Addr, SDOperand &R1,
886 if (Addr.getOpcode() == ISD::FrameIndex) return false;
887 if (Addr.getOpcode() == ISD::ADD) {
888 if (isa<ConstantSDNode>(Addr.getOperand(1)) &&
889 Predicate_simm13(Addr.getOperand(1).Val))
890 return false; // Let the reg+imm pattern catch this!
891 if (Addr.getOperand(0).getOpcode() == V8ISD::Lo ||
892 Addr.getOperand(1).getOpcode() == V8ISD::Lo)
893 return false; // Let the reg+imm pattern catch this!
894 R1 = Select(Addr.getOperand(0));
895 R2 = Select(Addr.getOperand(1));
900 R2 = CurDAG->getRegister(V8::G0, MVT::i32);
904 SDOperand SparcV8DAGToDAGISel::Select(SDOperand Op) {
906 if (N->getOpcode() >= ISD::BUILTIN_OP_END &&
907 N->getOpcode() < V8ISD::FIRST_NUMBER)
908 return Op; // Already selected.
909 // If this has already been converted, use it.
910 std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(Op);
911 if (CGMI != CodeGenMap.end()) return CGMI->second;
913 switch (N->getOpcode()) {
915 case ISD::FrameIndex: {
916 int FI = cast<FrameIndexSDNode>(N)->getIndex();
918 return CurDAG->SelectNodeTo(N, V8::ADDri, MVT::i32,
919 CurDAG->getTargetFrameIndex(FI, MVT::i32),
920 CurDAG->getTargetConstant(0, MVT::i32));
921 return CodeGenMap[Op] =
922 CurDAG->getTargetNode(V8::ADDri, MVT::i32,
923 CurDAG->getTargetFrameIndex(FI, MVT::i32),
924 CurDAG->getTargetConstant(0, MVT::i32));
926 case ISD::ADD_PARTS: {
927 SDOperand LHSL = Select(N->getOperand(0));
928 SDOperand LHSH = Select(N->getOperand(1));
929 SDOperand RHSL = Select(N->getOperand(2));
930 SDOperand RHSH = Select(N->getOperand(3));
931 // FIXME, handle immediate RHS.
932 SDOperand Low = CurDAG->getTargetNode(V8::ADDCCrr, MVT::i32, MVT::Flag,
934 SDOperand Hi = CurDAG->getTargetNode(V8::ADDXrr, MVT::i32, LHSH, RHSH,
936 CodeGenMap[SDOperand(N, 0)] = Low;
937 CodeGenMap[SDOperand(N, 1)] = Hi;
938 return Op.ResNo ? Hi : Low;
940 case ISD::SUB_PARTS: {
941 SDOperand LHSL = Select(N->getOperand(0));
942 SDOperand LHSH = Select(N->getOperand(1));
943 SDOperand RHSL = Select(N->getOperand(2));
944 SDOperand RHSH = Select(N->getOperand(3));
945 // FIXME, handle immediate RHS.
946 SDOperand Low = CurDAG->getTargetNode(V8::SUBCCrr, MVT::i32, MVT::Flag,
948 SDOperand Hi = CurDAG->getTargetNode(V8::SUBXrr, MVT::i32, LHSH, RHSH,
950 CodeGenMap[SDOperand(N, 0)] = Low;
951 CodeGenMap[SDOperand(N, 1)] = Hi;
952 return Op.ResNo ? Hi : Low;
956 // FIXME: should use a custom expander to expose the SRA to the dag.
957 SDOperand DivLHS = Select(N->getOperand(0));
958 SDOperand DivRHS = Select(N->getOperand(1));
960 // Set the Y register to the high-part.
962 if (N->getOpcode() == ISD::SDIV) {
963 TopPart = CurDAG->getTargetNode(V8::SRAri, MVT::i32, DivLHS,
964 CurDAG->getTargetConstant(31, MVT::i32));
966 TopPart = CurDAG->getRegister(V8::G0, MVT::i32);
968 TopPart = CurDAG->getTargetNode(V8::WRYrr, MVT::Flag, TopPart,
969 CurDAG->getRegister(V8::G0, MVT::i32));
971 // FIXME: Handle div by immediate.
972 unsigned Opcode = N->getOpcode() == ISD::SDIV ? V8::SDIVrr : V8::UDIVrr;
973 return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS, TopPart);
977 // FIXME: Handle mul by immediate.
978 SDOperand MulLHS = Select(N->getOperand(0));
979 SDOperand MulRHS = Select(N->getOperand(1));
980 unsigned Opcode = N->getOpcode() == ISD::MULHU ? V8::UMULrr : V8::SMULrr;
981 SDOperand Mul = CurDAG->getTargetNode(Opcode, MVT::i32, MVT::Flag,
983 // The high part is in the Y register.
984 return CurDAG->SelectNodeTo(N, V8::RDY, MVT::i32, Mul.getValue(1));
987 // FIXME: This is a workaround for a bug in tblgen.
988 { // Pattern #47: (call:Flag (tglobaladdr:i32):$dst, ICC:Flag)
989 // Emits: (CALL:void (tglobaladdr:i32):$dst)
990 // Pattern complexity = 2 cost = 1
991 SDOperand N1 = N->getOperand(1);
992 if (N1.getOpcode() != ISD::TargetGlobalAddress &&
993 N1.getOpcode() != ISD::ExternalSymbol) goto P47Fail;
994 SDOperand InFlag = SDOperand(0, 0);
995 SDOperand Chain = N->getOperand(0);
997 Chain = Select(Chain);
999 if (N->getNumOperands() == 3) {
1000 InFlag = Select(N->getOperand(2));
1001 Result = CurDAG->getTargetNode(V8::CALL, MVT::Other, MVT::Flag, Tmp0,
1004 Result = CurDAG->getTargetNode(V8::CALL, MVT::Other, MVT::Flag, Tmp0,
1007 Chain = CodeGenMap[SDOperand(N, 0)] = Result.getValue(0);
1008 CodeGenMap[SDOperand(N, 1)] = Result.getValue(1);
1009 return Result.getValue(Op.ResNo);
1015 return SelectCode(Op);
1019 /// createPPCISelDag - This pass converts a legalized DAG into a
1020 /// PowerPC-specific DAG, ready for instruction scheduling.
1022 FunctionPass *llvm::createSparcV8ISelDag(TargetMachine &TM) {
1023 return new SparcV8DAGToDAGISel(TM);