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);
270 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
271 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
272 SDOperand Load = DAG.getLoad(MVT::f32, Root, FIPtr, DAG.getSrcValue(0));
273 ArgValues.push_back(Load);
280 if (I->use_empty()) { // Argument is dead.
281 if (CurArgReg < ArgRegEnd) ++CurArgReg;
282 if (CurArgReg < ArgRegEnd) ++CurArgReg;
283 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
284 } else if (CurArgReg == ArgRegEnd && ObjectVT == MVT::f64 &&
285 ((CurArgReg-ArgRegs) & 1) == 0) {
286 // If this is a double argument and the whole thing lives on the stack,
287 // and the argument is aligned, load the double straight from the stack.
288 // We can't do a load in cases like void foo([6ints], int,double),
289 // because the double wouldn't be aligned!
290 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset);
291 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
292 ArgValues.push_back(DAG.getLoad(MVT::f64, Root, FIPtr,
293 DAG.getSrcValue(0)));
296 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
297 unsigned VRegHi = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
298 MF.addLiveIn(*CurArgReg++, VRegHi);
299 HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32);
301 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
302 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
303 HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
307 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
308 unsigned VRegLo = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
309 MF.addLiveIn(*CurArgReg++, VRegLo);
310 LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32);
312 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4);
313 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
314 LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
317 // Compose the two halves together into an i64 unit.
318 SDOperand WholeValue =
319 DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal);
321 // If we want a double, do a bit convert.
322 if (ObjectVT == MVT::f64)
323 WholeValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, WholeValue);
325 ArgValues.push_back(WholeValue);
332 // Store remaining ArgRegs to the stack if this is a varargs function.
333 if (F.getFunctionType()->isVarArg()) {
334 // Remember the vararg offset for the va_start implementation.
335 VarArgsFrameOffset = ArgOffset;
337 for (; CurArgReg != ArgRegEnd; ++CurArgReg) {
338 unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
339 MF.addLiveIn(*CurArgReg, VReg);
340 SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
342 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
343 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
345 OutChains.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(),
346 Arg, FIPtr, DAG.getSrcValue(0)));
351 if (!OutChains.empty())
352 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, OutChains));
354 // Finally, inform the code generator which regs we return values in.
355 switch (getValueType(F.getReturnType())) {
356 default: assert(0 && "Unknown type!");
357 case MVT::isVoid: break;
362 MF.addLiveOut(V8::I0);
365 MF.addLiveOut(V8::I0);
366 MF.addLiveOut(V8::I1);
369 MF.addLiveOut(V8::F0);
372 MF.addLiveOut(V8::D0);
379 std::pair<SDOperand, SDOperand>
380 SparcV8TargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy,
381 bool isVarArg, unsigned CC,
382 bool isTailCall, SDOperand Callee,
383 ArgListTy &Args, SelectionDAG &DAG) {
384 MachineFunction &MF = DAG.getMachineFunction();
385 // Count the size of the outgoing arguments.
386 unsigned ArgsSize = 0;
387 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
388 switch (getValueType(Args[i].second)) {
389 default: assert(0 && "Unknown value type!");
404 ArgsSize -= 4*6; // Space for first 6 arguments is prereserved.
408 // Keep stack frames 8-byte aligned.
409 ArgsSize = (ArgsSize+7) & ~7;
411 Chain = DAG.getNode(ISD::CALLSEQ_START, MVT::Other, Chain,
412 DAG.getConstant(ArgsSize, getPointerTy()));
414 SDOperand StackPtr, NullSV;
415 std::vector<SDOperand> Stores;
416 std::vector<SDOperand> RegValuesToPass;
417 unsigned ArgOffset = 68;
418 for (unsigned i = 0, e = Args.size(); i != e; ++i) {
419 SDOperand Val = Args[i].first;
420 MVT::ValueType ObjectVT = Val.getValueType();
421 SDOperand ValToStore(0, 0);
424 default: assert(0 && "Unhandled argument type!");
428 // Promote the integer to 32-bits. If the input type is signed, use a
429 // sign extend, otherwise use a zero extend.
430 if (Args[i].second->isSigned())
431 Val = DAG.getNode(ISD::SIGN_EXTEND, MVT::i32, Val);
433 Val = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Val);
438 if (RegValuesToPass.size() >= 6) {
441 RegValuesToPass.push_back(Val);
446 if (RegValuesToPass.size() >= 6) {
449 // Convert this to a FP value in an int reg.
450 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
451 RegValuesToPass.push_back(Val);
456 // If we can store this directly into the outgoing slot, do so. We can
457 // do this when all ArgRegs are used and if the outgoing slot is aligned.
458 // FIXME: McGill/misr fails with this.
459 if (0 && RegValuesToPass.size() >= 6 && ((ArgOffset-68) & 7) == 0) {
464 // Otherwise, convert this to a FP value in int regs.
465 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Val);
469 if (RegValuesToPass.size() >= 6) {
470 ValToStore = Val; // Whole thing is passed in memory.
474 // Split the value into top and bottom part. Top part goes in a reg.
475 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
476 DAG.getConstant(1, MVT::i32));
477 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
478 DAG.getConstant(0, MVT::i32));
479 RegValuesToPass.push_back(Hi);
481 if (RegValuesToPass.size() >= 6) {
486 RegValuesToPass.push_back(Lo);
491 if (ValToStore.Val) {
493 StackPtr = DAG.getRegister(V8::O6, MVT::i32);
494 NullSV = DAG.getSrcValue(NULL);
496 SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
497 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
498 Stores.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
499 ValToStore, PtrOff, NullSV));
501 ArgOffset += ObjSize;
504 // Emit all stores, make sure the occur before any copies into physregs.
506 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, Stores);
508 static const unsigned ArgRegs[] = {
509 V8::O0, V8::O1, V8::O2, V8::O3, V8::O4, V8::O5
512 // Build a sequence of copy-to-reg nodes chained together with token chain
513 // and flag operands which copy the outgoing args into O[0-5].
515 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
516 Chain = DAG.getCopyToReg(Chain, ArgRegs[i], RegValuesToPass[i], InFlag);
517 InFlag = Chain.getValue(1);
520 // If the callee is a GlobalAddress node (quite common, every direct call is)
521 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
522 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
523 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
525 std::vector<MVT::ValueType> NodeTys;
526 NodeTys.push_back(MVT::Other); // Returns a chain
527 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
529 Chain = SDOperand(DAG.getCall(NodeTys, Chain, Callee, InFlag), 0);
531 Chain = SDOperand(DAG.getCall(NodeTys, Chain, Callee), 0);
532 InFlag = Chain.getValue(1);
534 MVT::ValueType RetTyVT = getValueType(RetTy);
536 if (RetTyVT != MVT::isVoid) {
538 default: assert(0 && "Unknown value type to return!");
542 RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag);
543 Chain = RetVal.getValue(1);
545 // Add a note to keep track of whether it is sign or zero extended.
546 RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext :ISD::AssertZext,
547 MVT::i32, RetVal, DAG.getValueType(RetTyVT));
548 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
551 RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag);
552 Chain = RetVal.getValue(1);
555 RetVal = DAG.getCopyFromReg(Chain, V8::F0, MVT::f32, InFlag);
556 Chain = RetVal.getValue(1);
559 RetVal = DAG.getCopyFromReg(Chain, V8::D0, MVT::f64, InFlag);
560 Chain = RetVal.getValue(1);
563 SDOperand Lo = DAG.getCopyFromReg(Chain, V8::O1, MVT::i32, InFlag);
564 SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), V8::O0, MVT::i32,
566 RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
567 Chain = Hi.getValue(1);
572 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
573 DAG.getConstant(ArgsSize, getPointerTy()));
575 return std::make_pair(RetVal, Chain);
578 SDOperand SparcV8TargetLowering::LowerReturnTo(SDOperand Chain, SDOperand Op,
581 switch (Op.getValueType()) {
582 default: assert(0 && "Unknown type to return!");
584 Copy = DAG.getCopyToReg(Chain, V8::I0, Op, SDOperand());
587 Copy = DAG.getCopyToReg(Chain, V8::F0, Op, SDOperand());
590 Copy = DAG.getCopyToReg(Chain, V8::D0, Op, SDOperand());
593 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
594 DAG.getConstant(1, MVT::i32));
595 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
596 DAG.getConstant(0, MVT::i32));
597 Copy = DAG.getCopyToReg(Chain, V8::I0, Hi, SDOperand());
598 Copy = DAG.getCopyToReg(Copy, V8::I1, Lo, Copy.getValue(1));
601 return DAG.getNode(V8ISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
604 SDOperand SparcV8TargetLowering::
605 LowerVAStart(SDOperand Chain, SDOperand VAListP, Value *VAListV,
608 SDOperand Offset = DAG.getNode(ISD::ADD, MVT::i32,
609 DAG.getRegister(V8::I6, MVT::i32),
610 DAG.getConstant(VarArgsFrameOffset, MVT::i32));
611 return DAG.getNode(ISD::STORE, MVT::Other, Chain, Offset,
612 VAListP, DAG.getSrcValue(VAListV));
615 std::pair<SDOperand,SDOperand> SparcV8TargetLowering::
616 LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
617 const Type *ArgTy, SelectionDAG &DAG) {
618 // Load the pointer out of the valist.
619 SDOperand Ptr = DAG.getLoad(MVT::i32, Chain,
620 VAListP, DAG.getSrcValue(VAListV));
621 MVT::ValueType ArgVT = getValueType(ArgTy);
622 SDOperand Val = DAG.getLoad(ArgVT, Ptr.getValue(1),
623 Ptr, DAG.getSrcValue(NULL));
624 // Increment the pointer.
625 Ptr = DAG.getNode(ISD::ADD, MVT::i32, Ptr,
626 DAG.getConstant(MVT::getSizeInBits(ArgVT)/8, MVT::i32));
627 // Store it back to the valist.
628 Chain = DAG.getNode(ISD::STORE, MVT::Other, Chain, Ptr,
629 VAListP, DAG.getSrcValue(VAListV));
630 return std::make_pair(Val, Chain);
633 std::pair<SDOperand, SDOperand> SparcV8TargetLowering::
634 LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
636 assert(0 && "Unimp");
640 SDOperand SparcV8TargetLowering::
641 LowerOperation(SDOperand Op, SelectionDAG &DAG) {
642 switch (Op.getOpcode()) {
643 default: assert(0 && "Should not custom lower this!");
644 case ISD::GlobalAddress: {
645 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
646 SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32);
647 SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, GA);
648 SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, GA);
649 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
651 case ISD::ConstantPool: {
652 Constant *C = cast<ConstantPoolSDNode>(Op)->get();
653 SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32);
654 SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, CP);
655 SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, CP);
656 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
658 case ISD::FP_TO_SINT:
659 // Convert the fp value to integer in an FP register.
660 assert(Op.getValueType() == MVT::i32);
661 Op = DAG.getNode(V8ISD::FTOI, MVT::f32, Op.getOperand(0));
662 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
663 case ISD::SINT_TO_FP: {
664 assert(Op.getOperand(0).getValueType() == MVT::i32);
665 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
666 // Convert the int value to FP in an FP register.
667 return DAG.getNode(V8ISD::ITOF, Op.getValueType(), Tmp);
670 SDOperand Chain = Op.getOperand(0);
671 SDOperand CC = Op.getOperand(1);
672 SDOperand LHS = Op.getOperand(2);
673 SDOperand RHS = Op.getOperand(3);
674 SDOperand Dest = Op.getOperand(4);
676 // Get the condition flag.
677 if (LHS.getValueType() == MVT::i32) {
678 std::vector<MVT::ValueType> VTs;
679 VTs.push_back(MVT::i32);
680 VTs.push_back(MVT::Flag);
681 std::vector<SDOperand> Ops;
684 SDOperand Cond = DAG.getNode(V8ISD::CMPICC, VTs, Ops).getValue(1);
685 return DAG.getNode(V8ISD::BRICC, MVT::Other, Chain, Dest, CC, Cond);
687 SDOperand Cond = DAG.getNode(V8ISD::CMPFCC, MVT::Flag, LHS, RHS);
688 return DAG.getNode(V8ISD::BRFCC, MVT::Other, Chain, Dest, CC, Cond);
691 case ISD::SELECT_CC: {
692 SDOperand LHS = Op.getOperand(0);
693 SDOperand RHS = Op.getOperand(1);
694 unsigned CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
695 SDOperand TrueVal = Op.getOperand(2);
696 SDOperand FalseVal = Op.getOperand(3);
698 SDOperand CompareFlag;
700 if (LHS.getValueType() == MVT::i32) {
701 std::vector<MVT::ValueType> VTs;
702 VTs.push_back(LHS.getValueType()); // subcc returns a value
703 VTs.push_back(MVT::Flag);
704 std::vector<SDOperand> Ops;
707 CompareFlag = DAG.getNode(V8ISD::CMPICC, VTs, Ops).getValue(1);
708 Opc = V8ISD::SELECT_ICC;
710 CompareFlag = DAG.getNode(V8ISD::CMPFCC, MVT::Flag, LHS, RHS);
711 Opc = V8ISD::SELECT_FCC;
713 return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal,
714 DAG.getConstant(CC, MVT::i32), CompareFlag);
720 SparcV8TargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
721 MachineBasicBlock *BB) {
723 // Figure out the conditional branch opcode to use for this select_cc.
724 switch (MI->getOpcode()) {
725 default: assert(0 && "Unknown SELECT_CC!");
726 case V8::SELECT_CC_Int_ICC:
727 case V8::SELECT_CC_FP_ICC:
728 case V8::SELECT_CC_DFP_ICC:
730 switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) {
731 default: assert(0 && "Unknown integer condition code!");
732 case ISD::SETEQ: BROpcode = V8::BE; break;
733 case ISD::SETNE: BROpcode = V8::BNE; break;
734 case ISD::SETLT: BROpcode = V8::BL; break;
735 case ISD::SETGT: BROpcode = V8::BG; break;
736 case ISD::SETLE: BROpcode = V8::BLE; break;
737 case ISD::SETGE: BROpcode = V8::BGE; break;
738 case ISD::SETULT: BROpcode = V8::BCS; break;
739 case ISD::SETULE: BROpcode = V8::BLEU; break;
740 case ISD::SETUGT: BROpcode = V8::BGU; break;
741 case ISD::SETUGE: BROpcode = V8::BCC; break;
744 case V8::SELECT_CC_Int_FCC:
745 case V8::SELECT_CC_FP_FCC:
746 case V8::SELECT_CC_DFP_FCC:
748 switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) {
749 default: assert(0 && "Unknown fp condition code!");
750 case ISD::SETEQ: BROpcode = V8::FBE; break;
751 case ISD::SETNE: BROpcode = V8::FBNE; break;
752 case ISD::SETLT: BROpcode = V8::FBL; break;
753 case ISD::SETGT: BROpcode = V8::FBG; break;
754 case ISD::SETLE: BROpcode = V8::FBLE; break;
755 case ISD::SETGE: BROpcode = V8::FBGE; break;
756 case ISD::SETULT: BROpcode = V8::FBUL; break;
757 case ISD::SETULE: BROpcode = V8::FBULE; break;
758 case ISD::SETUGT: BROpcode = V8::FBUG; break;
759 case ISD::SETUGE: BROpcode = V8::FBUGE; break;
760 case ISD::SETUO: BROpcode = V8::FBU; break;
761 case ISD::SETO: BROpcode = V8::FBO; break;
762 case ISD::SETONE: BROpcode = V8::FBLG; break;
763 case ISD::SETUEQ: BROpcode = V8::FBUE; break;
768 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
769 // control-flow pattern. The incoming instruction knows the destination vreg
770 // to set, the condition code register to branch on, the true/false values to
771 // select between, and a branch opcode to use.
772 const BasicBlock *LLVM_BB = BB->getBasicBlock();
773 ilist<MachineBasicBlock>::iterator It = BB;
780 // fallthrough --> copy0MBB
781 MachineBasicBlock *thisMBB = BB;
782 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
783 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
784 BuildMI(BB, BROpcode, 1).addMBB(sinkMBB);
785 MachineFunction *F = BB->getParent();
786 F->getBasicBlockList().insert(It, copy0MBB);
787 F->getBasicBlockList().insert(It, sinkMBB);
788 // Update machine-CFG edges
789 BB->addSuccessor(copy0MBB);
790 BB->addSuccessor(sinkMBB);
794 // # fallthrough to sinkMBB
797 // Update machine-CFG edges
798 BB->addSuccessor(sinkMBB);
801 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
804 BuildMI(BB, V8::PHI, 4, MI->getOperand(0).getReg())
805 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
806 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
808 delete MI; // The pseudo instruction is gone now.
812 //===----------------------------------------------------------------------===//
813 // Instruction Selector Implementation
814 //===----------------------------------------------------------------------===//
816 //===--------------------------------------------------------------------===//
817 /// SparcV8DAGToDAGISel - PPC specific code to select Sparc V8 machine
818 /// instructions for SelectionDAG operations.
821 class SparcV8DAGToDAGISel : public SelectionDAGISel {
822 SparcV8TargetLowering V8Lowering;
824 SparcV8DAGToDAGISel(TargetMachine &TM)
825 : SelectionDAGISel(V8Lowering), V8Lowering(TM) {}
827 SDOperand Select(SDOperand Op);
829 // Complex Pattern Selectors.
830 bool SelectADDRrr(SDOperand N, SDOperand &R1, SDOperand &R2);
831 bool SelectADDRri(SDOperand N, SDOperand &Base, SDOperand &Offset);
833 /// InstructionSelectBasicBlock - This callback is invoked by
834 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
835 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
837 virtual const char *getPassName() const {
838 return "PowerPC DAG->DAG Pattern Instruction Selection";
841 // Include the pieces autogenerated from the target description.
842 #include "SparcV8GenDAGISel.inc"
844 } // end anonymous namespace
846 /// InstructionSelectBasicBlock - This callback is invoked by
847 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
848 void SparcV8DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
851 // Select target instructions for the DAG.
852 DAG.setRoot(Select(DAG.getRoot()));
854 DAG.RemoveDeadNodes();
856 // Emit machine code to BB.
857 ScheduleAndEmitDAG(DAG);
860 bool SparcV8DAGToDAGISel::SelectADDRri(SDOperand Addr, SDOperand &Base,
862 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
863 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
864 Offset = CurDAG->getTargetConstant(0, MVT::i32);
868 if (Addr.getOpcode() == ISD::ADD) {
869 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) {
870 if (Predicate_simm13(CN)) {
871 if (FrameIndexSDNode *FIN =
872 dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
873 // Constant offset from frame ref.
874 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
876 Base = Select(Addr.getOperand(0));
878 Offset = CurDAG->getTargetConstant(CN->getValue(), MVT::i32);
882 if (Addr.getOperand(0).getOpcode() == V8ISD::Lo) {
883 Base = Select(Addr.getOperand(1));
884 Offset = Addr.getOperand(0).getOperand(0);
887 if (Addr.getOperand(1).getOpcode() == V8ISD::Lo) {
888 Base = Select(Addr.getOperand(0));
889 Offset = Addr.getOperand(1).getOperand(0);
894 Offset = CurDAG->getTargetConstant(0, MVT::i32);
898 bool SparcV8DAGToDAGISel::SelectADDRrr(SDOperand Addr, SDOperand &R1,
900 if (Addr.getOpcode() == ISD::FrameIndex) return false;
901 if (Addr.getOpcode() == ISD::ADD) {
902 if (isa<ConstantSDNode>(Addr.getOperand(1)) &&
903 Predicate_simm13(Addr.getOperand(1).Val))
904 return false; // Let the reg+imm pattern catch this!
905 if (Addr.getOperand(0).getOpcode() == V8ISD::Lo ||
906 Addr.getOperand(1).getOpcode() == V8ISD::Lo)
907 return false; // Let the reg+imm pattern catch this!
908 R1 = Select(Addr.getOperand(0));
909 R2 = Select(Addr.getOperand(1));
914 R2 = CurDAG->getRegister(V8::G0, MVT::i32);
918 SDOperand SparcV8DAGToDAGISel::Select(SDOperand Op) {
920 if (N->getOpcode() >= ISD::BUILTIN_OP_END &&
921 N->getOpcode() < V8ISD::FIRST_NUMBER)
922 return Op; // Already selected.
923 // If this has already been converted, use it.
924 std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(Op);
925 if (CGMI != CodeGenMap.end()) return CGMI->second;
927 switch (N->getOpcode()) {
929 case ISD::FrameIndex: {
930 int FI = cast<FrameIndexSDNode>(N)->getIndex();
932 return CurDAG->SelectNodeTo(N, V8::ADDri, MVT::i32,
933 CurDAG->getTargetFrameIndex(FI, MVT::i32),
934 CurDAG->getTargetConstant(0, MVT::i32));
935 return CodeGenMap[Op] =
936 CurDAG->getTargetNode(V8::ADDri, MVT::i32,
937 CurDAG->getTargetFrameIndex(FI, MVT::i32),
938 CurDAG->getTargetConstant(0, MVT::i32));
940 case ISD::ADD_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::ADDCCrr, MVT::i32, MVT::Flag,
948 SDOperand Hi = CurDAG->getTargetNode(V8::ADDXrr, MVT::i32, LHSH, RHSH,
950 CodeGenMap[SDOperand(N, 0)] = Low;
951 CodeGenMap[SDOperand(N, 1)] = Hi;
952 return Op.ResNo ? Hi : Low;
954 case ISD::SUB_PARTS: {
955 SDOperand LHSL = Select(N->getOperand(0));
956 SDOperand LHSH = Select(N->getOperand(1));
957 SDOperand RHSL = Select(N->getOperand(2));
958 SDOperand RHSH = Select(N->getOperand(3));
959 // FIXME, handle immediate RHS.
960 SDOperand Low = CurDAG->getTargetNode(V8::SUBCCrr, MVT::i32, MVT::Flag,
962 SDOperand Hi = CurDAG->getTargetNode(V8::SUBXrr, MVT::i32, LHSH, RHSH,
964 CodeGenMap[SDOperand(N, 0)] = Low;
965 CodeGenMap[SDOperand(N, 1)] = Hi;
966 return Op.ResNo ? Hi : Low;
970 // FIXME: should use a custom expander to expose the SRA to the dag.
971 SDOperand DivLHS = Select(N->getOperand(0));
972 SDOperand DivRHS = Select(N->getOperand(1));
974 // Set the Y register to the high-part.
976 if (N->getOpcode() == ISD::SDIV) {
977 TopPart = CurDAG->getTargetNode(V8::SRAri, MVT::i32, DivLHS,
978 CurDAG->getTargetConstant(31, MVT::i32));
980 TopPart = CurDAG->getRegister(V8::G0, MVT::i32);
982 TopPart = CurDAG->getTargetNode(V8::WRYrr, MVT::Flag, TopPart,
983 CurDAG->getRegister(V8::G0, MVT::i32));
985 // FIXME: Handle div by immediate.
986 unsigned Opcode = N->getOpcode() == ISD::SDIV ? V8::SDIVrr : V8::UDIVrr;
987 return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS, TopPart);
991 // FIXME: Handle mul by immediate.
992 SDOperand MulLHS = Select(N->getOperand(0));
993 SDOperand MulRHS = Select(N->getOperand(1));
994 unsigned Opcode = N->getOpcode() == ISD::MULHU ? V8::UMULrr : V8::SMULrr;
995 SDOperand Mul = CurDAG->getTargetNode(Opcode, MVT::i32, MVT::Flag,
997 // The high part is in the Y register.
998 return CurDAG->SelectNodeTo(N, V8::RDY, MVT::i32, Mul.getValue(1));
1001 // FIXME: This is a workaround for a bug in tblgen.
1002 { // Pattern #47: (call:Flag (tglobaladdr:i32):$dst, ICC:Flag)
1003 // Emits: (CALL:void (tglobaladdr:i32):$dst)
1004 // Pattern complexity = 2 cost = 1
1005 SDOperand N1 = N->getOperand(1);
1006 if (N1.getOpcode() != ISD::TargetGlobalAddress &&
1007 N1.getOpcode() != ISD::ExternalSymbol) goto P47Fail;
1008 SDOperand InFlag = SDOperand(0, 0);
1009 SDOperand Chain = N->getOperand(0);
1010 SDOperand Tmp0 = N1;
1011 Chain = Select(Chain);
1013 if (N->getNumOperands() == 3) {
1014 InFlag = Select(N->getOperand(2));
1015 Result = CurDAG->getTargetNode(V8::CALL, MVT::Other, MVT::Flag, Tmp0,
1018 Result = CurDAG->getTargetNode(V8::CALL, MVT::Other, MVT::Flag, Tmp0,
1021 Chain = CodeGenMap[SDOperand(N, 0)] = Result.getValue(0);
1022 CodeGenMap[SDOperand(N, 1)] = Result.getValue(1);
1023 return Result.getValue(Op.ResNo);
1029 return SelectCode(Op);
1033 /// createPPCISelDag - This pass converts a legalized DAG into a
1034 /// PowerPC-specific DAG, ready for instruction scheduling.
1036 FunctionPass *llvm::createSparcV8ISelDag(TargetMachine &TM) {
1037 return new SparcV8DAGToDAGISel(TM);