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 // Expand these to their default code.
165 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
166 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
167 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
169 setStackPointerRegisterToSaveRestore(V8::O6);
171 computeRegisterProperties();
174 const char *SparcV8TargetLowering::getTargetNodeName(unsigned Opcode) const {
177 case V8ISD::CMPICC: return "V8ISD::CMPICC";
178 case V8ISD::CMPFCC: return "V8ISD::CMPFCC";
179 case V8ISD::BRICC: return "V8ISD::BRICC";
180 case V8ISD::BRFCC: return "V8ISD::BRFCC";
181 case V8ISD::Hi: return "V8ISD::Hi";
182 case V8ISD::Lo: return "V8ISD::Lo";
183 case V8ISD::FTOI: return "V8ISD::FTOI";
184 case V8ISD::ITOF: return "V8ISD::ITOF";
185 case V8ISD::SELECT_ICC: return "V8ISD::SELECT_ICC";
186 case V8ISD::SELECT_FCC: return "V8ISD::SELECT_FCC";
187 case V8ISD::RET_FLAG: return "V8ISD::RET_FLAG";
191 /// LowerArguments - V8 uses a very simple ABI, where all values are passed in
192 /// either one or two GPRs, including FP values. TODO: we should pass FP values
193 /// in FP registers for fastcc functions.
194 std::vector<SDOperand>
195 SparcV8TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
196 MachineFunction &MF = DAG.getMachineFunction();
197 SSARegMap *RegMap = MF.getSSARegMap();
198 std::vector<SDOperand> ArgValues;
200 static const unsigned ArgRegs[] = {
201 V8::I0, V8::I1, V8::I2, V8::I3, V8::I4, V8::I5
204 const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6;
205 unsigned ArgOffset = 68;
207 SDOperand Root = DAG.getRoot();
208 std::vector<SDOperand> OutChains;
210 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
211 MVT::ValueType ObjectVT = getValueType(I->getType());
214 default: assert(0 && "Unhandled argument type!");
219 if (I->use_empty()) { // Argument is dead.
220 if (CurArgReg < ArgRegEnd) ++CurArgReg;
221 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
222 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
223 unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
224 MF.addLiveIn(*CurArgReg++, VReg);
225 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
226 if (ObjectVT != MVT::i32) {
227 unsigned AssertOp = I->getType()->isSigned() ? ISD::AssertSext
229 Arg = DAG.getNode(AssertOp, MVT::i32, Arg,
230 DAG.getValueType(ObjectVT));
231 Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg);
233 ArgValues.push_back(Arg);
235 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
236 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
238 if (ObjectVT == MVT::i32) {
239 Load = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
242 I->getType()->isSigned() ? ISD::SEXTLOAD : ISD::ZEXTLOAD;
244 // Sparc is big endian, so add an offset based on the ObjectVT.
245 unsigned Offset = 4-std::max(1U, MVT::getSizeInBits(ObjectVT)/8);
246 FIPtr = DAG.getNode(ISD::ADD, MVT::i32, FIPtr,
247 DAG.getConstant(Offset, MVT::i32));
248 Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr,
249 DAG.getSrcValue(0), ObjectVT);
250 Load = DAG.getNode(ISD::TRUNCATE, ObjectVT, Load);
252 ArgValues.push_back(Load);
258 if (I->use_empty()) { // Argument is dead.
259 if (CurArgReg < ArgRegEnd) ++CurArgReg;
260 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
261 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
262 // FP value is passed in an integer register.
263 unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
264 MF.addLiveIn(*CurArgReg++, VReg);
265 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
267 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Arg);
268 ArgValues.push_back(Arg);
275 if (I->use_empty()) { // Argument is dead.
276 if (CurArgReg < ArgRegEnd) ++CurArgReg;
277 if (CurArgReg < ArgRegEnd) ++CurArgReg;
278 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
279 } else if (CurArgReg == ArgRegEnd && ObjectVT == MVT::f64 &&
280 ((CurArgReg-ArgRegs) & 1) == 0) {
281 // If this is a double argument and the whole thing lives on the stack,
282 // and the argument is aligned, load the double straight from the stack.
283 // We can't do a load in cases like void foo([6ints], int,double),
284 // because the double wouldn't be aligned!
285 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset);
286 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
287 ArgValues.push_back(DAG.getLoad(MVT::f64, Root, FIPtr,
288 DAG.getSrcValue(0)));
291 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
292 unsigned VRegHi = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
293 MF.addLiveIn(*CurArgReg++, VRegHi);
294 HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32);
296 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
297 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
298 HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
302 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
303 unsigned VRegLo = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
304 MF.addLiveIn(*CurArgReg++, VRegLo);
305 LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32);
307 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4);
308 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
309 LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
312 // Compose the two halves together into an i64 unit.
313 SDOperand WholeValue =
314 DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal);
316 // If we want a double, do a bit convert.
317 if (ObjectVT == MVT::f64)
318 WholeValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, WholeValue);
320 ArgValues.push_back(WholeValue);
327 // Store remaining ArgRegs to the stack if this is a varargs function.
328 if (F.getFunctionType()->isVarArg()) {
329 // Remember the vararg offset for the va_start implementation.
330 VarArgsFrameOffset = ArgOffset;
332 for (; CurArgReg != ArgRegEnd; ++CurArgReg) {
333 unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
334 MF.addLiveIn(*CurArgReg, VReg);
335 SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
337 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
338 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
340 OutChains.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(),
341 Arg, FIPtr, DAG.getSrcValue(0)));
346 if (!OutChains.empty())
347 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, OutChains));
349 // Finally, inform the code generator which regs we return values in.
350 switch (getValueType(F.getReturnType())) {
351 default: assert(0 && "Unknown type!");
352 case MVT::isVoid: break;
357 MF.addLiveOut(V8::I0);
360 MF.addLiveOut(V8::I0);
361 MF.addLiveOut(V8::I1);
364 MF.addLiveOut(V8::F0);
367 MF.addLiveOut(V8::D0);
374 std::pair<SDOperand, SDOperand>
375 SparcV8TargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy,
376 bool isVarArg, unsigned CC,
377 bool isTailCall, SDOperand Callee,
378 ArgListTy &Args, SelectionDAG &DAG) {
379 MachineFunction &MF = DAG.getMachineFunction();
380 // Count the size of the outgoing arguments.
381 unsigned ArgsSize = 0;
382 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
383 switch (getValueType(Args[i].second)) {
384 default: assert(0 && "Unknown value type!");
399 ArgsSize -= 4*6; // Space for first 6 arguments is prereserved.
403 // Keep stack frames 8-byte aligned.
404 ArgsSize = (ArgsSize+7) & ~7;
406 Chain = DAG.getNode(ISD::CALLSEQ_START, MVT::Other, Chain,
407 DAG.getConstant(ArgsSize, getPointerTy()));
409 SDOperand StackPtr, NullSV;
410 std::vector<SDOperand> Stores;
411 std::vector<SDOperand> RegValuesToPass;
412 unsigned ArgOffset = 68;
413 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
414 SDOperand Val = Args[i].first;
415 MVT::ValueType ObjectVT = Val.getValueType();
416 SDOperand ValToStore(0, 0);
419 default: assert(0 && "Unhandled argument type!");
423 // Promote the integer to 32-bits. If the input type is signed, use a
424 // sign extend, otherwise use a zero extend.
425 if (Args[i].second->isSigned())
426 Val = DAG.getNode(ISD::SIGN_EXTEND, MVT::i32, Val);
428 Val = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Val);
433 if (RegValuesToPass.size() >= 6) {
436 RegValuesToPass.push_back(Val);
441 if (RegValuesToPass.size() >= 6) {
444 // Convert this to a FP value in an int reg.
445 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
446 RegValuesToPass.push_back(Val);
451 // If we can store this directly into the outgoing slot, do so. We can
452 // do this when all ArgRegs are used and if the outgoing slot is aligned.
453 // FIXME: McGill/misr fails with this.
454 if (0 && RegValuesToPass.size() >= 6 && ((ArgOffset-68) & 7) == 0) {
459 // Otherwise, convert this to a FP value in int regs.
460 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Val);
464 if (RegValuesToPass.size() >= 6) {
465 ValToStore = Val; // Whole thing is passed in memory.
469 // Split the value into top and bottom part. Top part goes in a reg.
470 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
471 DAG.getConstant(1, MVT::i32));
472 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
473 DAG.getConstant(0, MVT::i32));
474 RegValuesToPass.push_back(Hi);
476 if (RegValuesToPass.size() >= 6) {
481 RegValuesToPass.push_back(Lo);
486 if (ValToStore.Val) {
488 StackPtr = DAG.getRegister(V8::O6, MVT::i32);
489 NullSV = DAG.getSrcValue(NULL);
491 SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
492 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
493 Stores.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
494 ValToStore, PtrOff, NullSV));
496 ArgOffset += ObjSize;
499 // Emit all stores, make sure the occur before any copies into physregs.
501 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, Stores);
503 static const unsigned ArgRegs[] = {
504 V8::O0, V8::O1, V8::O2, V8::O3, V8::O4, V8::O5
507 // Build a sequence of copy-to-reg nodes chained together with token chain
508 // and flag operands which copy the outgoing args into O[0-5].
510 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
511 Chain = DAG.getCopyToReg(Chain, ArgRegs[i], RegValuesToPass[i], InFlag);
512 InFlag = Chain.getValue(1);
515 // If the callee is a GlobalAddress node (quite common, every direct call is)
516 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
517 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
518 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
520 std::vector<MVT::ValueType> NodeTys;
521 NodeTys.push_back(MVT::Other); // Returns a chain
522 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
524 Chain = SDOperand(DAG.getCall(NodeTys, Chain, Callee, InFlag), 0);
526 Chain = SDOperand(DAG.getCall(NodeTys, Chain, Callee), 0);
527 InFlag = Chain.getValue(1);
529 MVT::ValueType RetTyVT = getValueType(RetTy);
531 if (RetTyVT != MVT::isVoid) {
533 default: assert(0 && "Unknown value type to return!");
537 RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag);
538 Chain = RetVal.getValue(1);
540 // Add a note to keep track of whether it is sign or zero extended.
541 RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext :ISD::AssertZext,
542 MVT::i32, RetVal, DAG.getValueType(RetTyVT));
543 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
546 RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag);
547 Chain = RetVal.getValue(1);
550 RetVal = DAG.getCopyFromReg(Chain, V8::F0, MVT::f32, InFlag);
551 Chain = RetVal.getValue(1);
554 RetVal = DAG.getCopyFromReg(Chain, V8::D0, MVT::f64, InFlag);
555 Chain = RetVal.getValue(1);
558 SDOperand Lo = DAG.getCopyFromReg(Chain, V8::O1, MVT::i32, InFlag);
559 SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), V8::O0, MVT::i32,
561 RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
562 Chain = Hi.getValue(1);
567 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
568 DAG.getConstant(ArgsSize, getPointerTy()));
570 return std::make_pair(RetVal, Chain);
573 SDOperand SparcV8TargetLowering::LowerReturnTo(SDOperand Chain, SDOperand Op,
576 switch (Op.getValueType()) {
577 default: assert(0 && "Unknown type to return!");
579 Copy = DAG.getCopyToReg(Chain, V8::I0, Op, SDOperand());
582 Copy = DAG.getCopyToReg(Chain, V8::F0, Op, SDOperand());
585 Copy = DAG.getCopyToReg(Chain, V8::D0, Op, SDOperand());
588 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
589 DAG.getConstant(1, MVT::i32));
590 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
591 DAG.getConstant(0, MVT::i32));
592 Copy = DAG.getCopyToReg(Chain, V8::I0, Hi, SDOperand());
593 Copy = DAG.getCopyToReg(Copy, V8::I1, Lo, Copy.getValue(1));
596 return DAG.getNode(V8ISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
599 SDOperand SparcV8TargetLowering::
600 LowerVAStart(SDOperand Chain, SDOperand VAListP, Value *VAListV,
603 SDOperand Offset = DAG.getNode(ISD::ADD, MVT::i32,
604 DAG.getRegister(V8::I6, MVT::i32),
605 DAG.getConstant(VarArgsFrameOffset, MVT::i32));
606 return DAG.getNode(ISD::STORE, MVT::Other, Chain, Offset,
607 VAListP, DAG.getSrcValue(VAListV));
610 std::pair<SDOperand,SDOperand> SparcV8TargetLowering::
611 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
612 const Type *ArgTy, SelectionDAG &DAG) {
613 // Load the pointer out of the valist.
614 SDOperand Ptr = DAG.getLoad(MVT::i32, Chain,
615 VAListP, DAG.getSrcValue(VAListV));
616 MVT::ValueType ArgVT = getValueType(ArgTy);
617 SDOperand Val = DAG.getLoad(ArgVT, Ptr.getValue(1),
618 Ptr, DAG.getSrcValue(NULL));
619 // Increment the pointer.
620 Ptr = DAG.getNode(ISD::ADD, MVT::i32, Ptr,
621 DAG.getConstant(MVT::getSizeInBits(ArgVT)/8, MVT::i32));
622 // Store it back to the valist.
623 Chain = DAG.getNode(ISD::STORE, MVT::Other, Chain, Ptr,
624 VAListP, DAG.getSrcValue(VAListV));
625 return std::make_pair(Val, Chain);
628 std::pair<SDOperand, SDOperand> SparcV8TargetLowering::
629 LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
631 assert(0 && "Unimp");
635 SDOperand SparcV8TargetLowering::
636 LowerOperation(SDOperand Op, SelectionDAG &DAG) {
637 switch (Op.getOpcode()) {
638 default: assert(0 && "Should not custom lower this!");
639 case ISD::GlobalAddress: {
640 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
641 SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32);
642 SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, GA);
643 SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, GA);
644 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
646 case ISD::ConstantPool: {
647 Constant *C = cast<ConstantPoolSDNode>(Op)->get();
648 SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32);
649 SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, CP);
650 SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, CP);
651 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
653 case ISD::FP_TO_SINT:
654 // Convert the fp value to integer in an FP register.
655 assert(Op.getValueType() == MVT::i32);
656 Op = DAG.getNode(V8ISD::FTOI, MVT::f32, Op.getOperand(0));
657 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
658 case ISD::SINT_TO_FP: {
659 assert(Op.getOperand(0).getValueType() == MVT::i32);
660 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
661 // Convert the int value to FP in an FP register.
662 return DAG.getNode(V8ISD::ITOF, Op.getValueType(), Tmp);
665 SDOperand Chain = Op.getOperand(0);
666 SDOperand CC = Op.getOperand(1);
667 SDOperand LHS = Op.getOperand(2);
668 SDOperand RHS = Op.getOperand(3);
669 SDOperand Dest = Op.getOperand(4);
671 // Get the condition flag.
672 if (LHS.getValueType() == MVT::i32) {
673 std::vector<MVT::ValueType> VTs;
674 VTs.push_back(MVT::i32);
675 VTs.push_back(MVT::Flag);
676 std::vector<SDOperand> Ops;
679 SDOperand Cond = DAG.getNode(V8ISD::CMPICC, VTs, Ops).getValue(1);
680 return DAG.getNode(V8ISD::BRICC, MVT::Other, Chain, Dest, CC, Cond);
682 SDOperand Cond = DAG.getNode(V8ISD::CMPFCC, MVT::Flag, LHS, RHS);
683 return DAG.getNode(V8ISD::BRFCC, MVT::Other, Chain, Dest, CC, Cond);
686 case ISD::SELECT_CC: {
687 SDOperand LHS = Op.getOperand(0);
688 SDOperand RHS = Op.getOperand(1);
689 unsigned CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
690 SDOperand TrueVal = Op.getOperand(2);
691 SDOperand FalseVal = Op.getOperand(3);
693 SDOperand CompareFlag;
695 if (LHS.getValueType() == MVT::i32) {
696 std::vector<MVT::ValueType> VTs;
697 VTs.push_back(LHS.getValueType()); // subcc returns a value
698 VTs.push_back(MVT::Flag);
699 std::vector<SDOperand> Ops;
702 CompareFlag = DAG.getNode(V8ISD::CMPICC, VTs, Ops).getValue(1);
703 Opc = V8ISD::SELECT_ICC;
705 CompareFlag = DAG.getNode(V8ISD::CMPFCC, MVT::Flag, LHS, RHS);
706 Opc = V8ISD::SELECT_FCC;
708 return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal,
709 DAG.getConstant(CC, MVT::i32), CompareFlag);
715 SparcV8TargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
716 MachineBasicBlock *BB) {
718 // Figure out the conditional branch opcode to use for this select_cc.
719 switch (MI->getOpcode()) {
720 default: assert(0 && "Unknown SELECT_CC!");
721 case V8::SELECT_CC_Int_ICC:
722 case V8::SELECT_CC_FP_ICC:
723 case V8::SELECT_CC_DFP_ICC:
725 switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) {
726 default: assert(0 && "Unknown integer condition code!");
727 case ISD::SETEQ: BROpcode = V8::BE; break;
728 case ISD::SETNE: BROpcode = V8::BNE; break;
729 case ISD::SETLT: BROpcode = V8::BL; break;
730 case ISD::SETGT: BROpcode = V8::BG; break;
731 case ISD::SETLE: BROpcode = V8::BLE; break;
732 case ISD::SETGE: BROpcode = V8::BGE; break;
733 case ISD::SETULT: BROpcode = V8::BCS; break;
734 case ISD::SETULE: BROpcode = V8::BLEU; break;
735 case ISD::SETUGT: BROpcode = V8::BGU; break;
736 case ISD::SETUGE: BROpcode = V8::BCC; break;
739 case V8::SELECT_CC_Int_FCC:
740 case V8::SELECT_CC_FP_FCC:
741 case V8::SELECT_CC_DFP_FCC:
743 switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) {
744 default: assert(0 && "Unknown fp condition code!");
745 case ISD::SETEQ: BROpcode = V8::FBE; break;
746 case ISD::SETNE: BROpcode = V8::FBNE; break;
747 case ISD::SETLT: BROpcode = V8::FBL; break;
748 case ISD::SETGT: BROpcode = V8::FBG; break;
749 case ISD::SETLE: BROpcode = V8::FBLE; break;
750 case ISD::SETGE: BROpcode = V8::FBGE; break;
751 case ISD::SETULT: BROpcode = V8::FBUL; break;
752 case ISD::SETULE: BROpcode = V8::FBULE; break;
753 case ISD::SETUGT: BROpcode = V8::FBUG; break;
754 case ISD::SETUGE: BROpcode = V8::FBUGE; break;
755 case ISD::SETUO: BROpcode = V8::FBU; break;
756 case ISD::SETO: BROpcode = V8::FBO; break;
757 case ISD::SETONE: BROpcode = V8::FBLG; break;
758 case ISD::SETUEQ: BROpcode = V8::FBUE; break;
763 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
764 // control-flow pattern. The incoming instruction knows the destination vreg
765 // to set, the condition code register to branch on, the true/false values to
766 // select between, and a branch opcode to use.
767 const BasicBlock *LLVM_BB = BB->getBasicBlock();
768 ilist<MachineBasicBlock>::iterator It = BB;
775 // fallthrough --> copy0MBB
776 MachineBasicBlock *thisMBB = BB;
777 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
778 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
779 BuildMI(BB, BROpcode, 1).addMBB(sinkMBB);
780 MachineFunction *F = BB->getParent();
781 F->getBasicBlockList().insert(It, copy0MBB);
782 F->getBasicBlockList().insert(It, sinkMBB);
783 // Update machine-CFG edges
784 BB->addSuccessor(copy0MBB);
785 BB->addSuccessor(sinkMBB);
789 // # fallthrough to sinkMBB
792 // Update machine-CFG edges
793 BB->addSuccessor(sinkMBB);
796 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
799 BuildMI(BB, V8::PHI, 4, MI->getOperand(0).getReg())
800 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
801 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
803 delete MI; // The pseudo instruction is gone now.
807 //===----------------------------------------------------------------------===//
808 // Instruction Selector Implementation
809 //===----------------------------------------------------------------------===//
811 //===--------------------------------------------------------------------===//
812 /// SparcV8DAGToDAGISel - PPC specific code to select Sparc V8 machine
813 /// instructions for SelectionDAG operations.
816 class SparcV8DAGToDAGISel : public SelectionDAGISel {
817 SparcV8TargetLowering V8Lowering;
819 SparcV8DAGToDAGISel(TargetMachine &TM)
820 : SelectionDAGISel(V8Lowering), V8Lowering(TM) {}
822 SDOperand Select(SDOperand Op);
824 // Complex Pattern Selectors.
825 bool SelectADDRrr(SDOperand N, SDOperand &R1, SDOperand &R2);
826 bool SelectADDRri(SDOperand N, SDOperand &Base, SDOperand &Offset);
828 /// InstructionSelectBasicBlock - This callback is invoked by
829 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
830 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
832 virtual const char *getPassName() const {
833 return "PowerPC DAG->DAG Pattern Instruction Selection";
836 // Include the pieces autogenerated from the target description.
837 #include "SparcV8GenDAGISel.inc"
839 } // end anonymous namespace
841 /// InstructionSelectBasicBlock - This callback is invoked by
842 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
843 void SparcV8DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
846 // Select target instructions for the DAG.
847 DAG.setRoot(Select(DAG.getRoot()));
849 DAG.RemoveDeadNodes();
851 // Emit machine code to BB.
852 ScheduleAndEmitDAG(DAG);
855 bool SparcV8DAGToDAGISel::SelectADDRri(SDOperand Addr, SDOperand &Base,
857 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
858 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
859 Offset = CurDAG->getTargetConstant(0, MVT::i32);
863 if (Addr.getOpcode() == ISD::ADD) {
864 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) {
865 if (Predicate_simm13(CN)) {
866 if (FrameIndexSDNode *FIN =
867 dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
868 // Constant offset from frame ref.
869 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
871 Base = Select(Addr.getOperand(0));
873 Offset = CurDAG->getTargetConstant(CN->getValue(), MVT::i32);
877 if (Addr.getOperand(0).getOpcode() == V8ISD::Lo) {
878 Base = Select(Addr.getOperand(1));
879 Offset = Addr.getOperand(0).getOperand(0);
882 if (Addr.getOperand(1).getOpcode() == V8ISD::Lo) {
883 Base = Select(Addr.getOperand(0));
884 Offset = Addr.getOperand(1).getOperand(0);
889 Offset = CurDAG->getTargetConstant(0, MVT::i32);
893 bool SparcV8DAGToDAGISel::SelectADDRrr(SDOperand Addr, SDOperand &R1,
895 if (Addr.getOpcode() == ISD::FrameIndex) return false;
896 if (Addr.getOpcode() == ISD::ADD) {
897 if (isa<ConstantSDNode>(Addr.getOperand(1)) &&
898 Predicate_simm13(Addr.getOperand(1).Val))
899 return false; // Let the reg+imm pattern catch this!
900 if (Addr.getOperand(0).getOpcode() == V8ISD::Lo ||
901 Addr.getOperand(1).getOpcode() == V8ISD::Lo)
902 return false; // Let the reg+imm pattern catch this!
903 R1 = Select(Addr.getOperand(0));
904 R2 = Select(Addr.getOperand(1));
909 R2 = CurDAG->getRegister(V8::G0, MVT::i32);
913 SDOperand SparcV8DAGToDAGISel::Select(SDOperand Op) {
915 if (N->getOpcode() >= ISD::BUILTIN_OP_END &&
916 N->getOpcode() < V8ISD::FIRST_NUMBER)
917 return Op; // Already selected.
918 // If this has already been converted, use it.
919 std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(Op);
920 if (CGMI != CodeGenMap.end()) return CGMI->second;
922 switch (N->getOpcode()) {
924 case ISD::FrameIndex: {
925 int FI = cast<FrameIndexSDNode>(N)->getIndex();
927 return CurDAG->SelectNodeTo(N, V8::ADDri, MVT::i32,
928 CurDAG->getTargetFrameIndex(FI, MVT::i32),
929 CurDAG->getTargetConstant(0, MVT::i32));
930 return CodeGenMap[Op] =
931 CurDAG->getTargetNode(V8::ADDri, MVT::i32,
932 CurDAG->getTargetFrameIndex(FI, MVT::i32),
933 CurDAG->getTargetConstant(0, MVT::i32));
935 case ISD::ADD_PARTS: {
936 SDOperand LHSL = Select(N->getOperand(0));
937 SDOperand LHSH = Select(N->getOperand(1));
938 SDOperand RHSL = Select(N->getOperand(2));
939 SDOperand RHSH = Select(N->getOperand(3));
940 // FIXME, handle immediate RHS.
941 SDOperand Low = CurDAG->getTargetNode(V8::ADDCCrr, MVT::i32, MVT::Flag,
943 SDOperand Hi = CurDAG->getTargetNode(V8::ADDXrr, MVT::i32, LHSH, RHSH,
945 CodeGenMap[SDOperand(N, 0)] = Low;
946 CodeGenMap[SDOperand(N, 1)] = Hi;
947 return Op.ResNo ? Hi : Low;
949 case ISD::SUB_PARTS: {
950 SDOperand LHSL = Select(N->getOperand(0));
951 SDOperand LHSH = Select(N->getOperand(1));
952 SDOperand RHSL = Select(N->getOperand(2));
953 SDOperand RHSH = Select(N->getOperand(3));
954 // FIXME, handle immediate RHS.
955 SDOperand Low = CurDAG->getTargetNode(V8::SUBCCrr, MVT::i32, MVT::Flag,
957 SDOperand Hi = CurDAG->getTargetNode(V8::SUBXrr, MVT::i32, LHSH, RHSH,
959 CodeGenMap[SDOperand(N, 0)] = Low;
960 CodeGenMap[SDOperand(N, 1)] = Hi;
961 return Op.ResNo ? Hi : Low;
965 // FIXME: should use a custom expander to expose the SRA to the dag.
966 SDOperand DivLHS = Select(N->getOperand(0));
967 SDOperand DivRHS = Select(N->getOperand(1));
969 // Set the Y register to the high-part.
971 if (N->getOpcode() == ISD::SDIV) {
972 TopPart = CurDAG->getTargetNode(V8::SRAri, MVT::i32, DivLHS,
973 CurDAG->getTargetConstant(31, MVT::i32));
975 TopPart = CurDAG->getRegister(V8::G0, MVT::i32);
977 TopPart = CurDAG->getTargetNode(V8::WRYrr, MVT::Flag, TopPart,
978 CurDAG->getRegister(V8::G0, MVT::i32));
980 // FIXME: Handle div by immediate.
981 unsigned Opcode = N->getOpcode() == ISD::SDIV ? V8::SDIVrr : V8::UDIVrr;
982 return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS, TopPart);
986 // FIXME: Handle mul by immediate.
987 SDOperand MulLHS = Select(N->getOperand(0));
988 SDOperand MulRHS = Select(N->getOperand(1));
989 unsigned Opcode = N->getOpcode() == ISD::MULHU ? V8::UMULrr : V8::SMULrr;
990 SDOperand Mul = CurDAG->getTargetNode(Opcode, MVT::i32, MVT::Flag,
992 // The high part is in the Y register.
993 return CurDAG->SelectNodeTo(N, V8::RDY, MVT::i32, Mul.getValue(1));
996 // FIXME: This is a workaround for a bug in tblgen.
997 { // Pattern #47: (call:Flag (tglobaladdr:i32):$dst, ICC:Flag)
998 // Emits: (CALL:void (tglobaladdr:i32):$dst)
999 // Pattern complexity = 2 cost = 1
1000 SDOperand N1 = N->getOperand(1);
1001 if (N1.getOpcode() != ISD::TargetGlobalAddress &&
1002 N1.getOpcode() != ISD::ExternalSymbol) goto P47Fail;
1003 SDOperand InFlag = SDOperand(0, 0);
1004 SDOperand Chain = N->getOperand(0);
1005 SDOperand Tmp0 = N1;
1006 Chain = Select(Chain);
1008 if (N->getNumOperands() == 3) {
1009 InFlag = Select(N->getOperand(2));
1010 Result = CurDAG->getTargetNode(V8::CALL, MVT::Other, MVT::Flag, Tmp0,
1013 Result = CurDAG->getTargetNode(V8::CALL, MVT::Other, MVT::Flag, Tmp0,
1016 Chain = CodeGenMap[SDOperand(N, 0)] = Result.getValue(0);
1017 CodeGenMap[SDOperand(N, 1)] = Result.getValue(1);
1018 return Result.getValue(Op.ResNo);
1024 return SelectCode(Op);
1028 /// createPPCISelDag - This pass converts a legalized DAG into a
1029 /// PowerPC-specific DAG, ready for instruction scheduling.
1031 FunctionPass *llvm::createSparcV8ISelDag(TargetMachine &TM) {
1032 return new SparcV8DAGToDAGISel(TM);