1 //===-- SparcISelLowering.cpp - Sparc DAG Lowering Implementation ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the interfaces that Sparc uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #include "SparcISelLowering.h"
16 #include "SparcTargetMachine.h"
17 #include "llvm/Function.h"
18 #include "llvm/CodeGen/CallingConvLower.h"
19 #include "llvm/CodeGen/MachineFrameInfo.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 #include "llvm/CodeGen/MachineRegisterInfo.h"
23 #include "llvm/CodeGen/SelectionDAG.h"
24 #include "llvm/Target/TargetLoweringObjectFile.h"
25 #include "llvm/ADT/VectorExtras.h"
26 #include "llvm/Support/ErrorHandling.h"
30 //===----------------------------------------------------------------------===//
31 // Calling Convention Implementation
32 //===----------------------------------------------------------------------===//
34 #include "SparcGenCallingConv.inc"
37 SparcTargetLowering::LowerReturn(SDValue Chain,
38 CallingConv::ID CallConv, bool isVarArg,
39 const SmallVectorImpl<ISD::OutputArg> &Outs,
40 DebugLoc dl, SelectionDAG &DAG) {
42 // CCValAssign - represent the assignment of the return value to locations.
43 SmallVector<CCValAssign, 16> RVLocs;
45 // CCState - Info about the registers and stack slot.
46 CCState CCInfo(CallConv, isVarArg, DAG.getTarget(),
47 RVLocs, *DAG.getContext());
49 // Analize return values.
50 CCInfo.AnalyzeReturn(Outs, RetCC_Sparc32);
52 // If this is the first return lowered for this function, add the regs to the
53 // liveout set for the function.
54 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
55 for (unsigned i = 0; i != RVLocs.size(); ++i)
56 if (RVLocs[i].isRegLoc())
57 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
62 // Copy the result values into the output registers.
63 for (unsigned i = 0; i != RVLocs.size(); ++i) {
64 CCValAssign &VA = RVLocs[i];
65 assert(VA.isRegLoc() && "Can only return in registers!");
67 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
70 // Guarantee that all emitted copies are stuck together with flags.
71 Flag = Chain.getValue(1);
75 return DAG.getNode(SPISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
76 return DAG.getNode(SPISD::RET_FLAG, dl, MVT::Other, Chain);
79 /// LowerFormalArguments - V8 uses a very simple ABI, where all values are
80 /// passed in either one or two GPRs, including FP values. TODO: we should
81 /// pass FP values in FP registers for fastcc functions.
83 SparcTargetLowering::LowerFormalArguments(SDValue Chain,
84 CallingConv::ID CallConv, bool isVarArg,
85 const SmallVectorImpl<ISD::InputArg>
87 DebugLoc dl, SelectionDAG &DAG,
88 SmallVectorImpl<SDValue> &InVals) {
90 MachineFunction &MF = DAG.getMachineFunction();
91 MachineRegisterInfo &RegInfo = MF.getRegInfo();
93 // Assign locations to all of the incoming arguments.
94 SmallVector<CCValAssign, 16> ArgLocs;
95 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
96 ArgLocs, *DAG.getContext());
97 CCInfo.AnalyzeFormalArguments(Ins, CC_Sparc32);
99 static const unsigned ArgRegs[] = {
100 SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5
102 const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6;
103 unsigned ArgOffset = 68;
105 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
107 CCValAssign &VA = ArgLocs[i];
108 // FIXME: We ignore the register assignments of AnalyzeFormalArguments
109 // because it doesn't know how to split a double into two i32 registers.
110 EVT ObjectVT = VA.getValVT();
111 switch (ObjectVT.getSimpleVT().SimpleTy) {
112 default: llvm_unreachable("Unhandled argument type!");
117 if (!Ins[i].Used) { // Argument is dead.
118 if (CurArgReg < ArgRegEnd) ++CurArgReg;
119 InVals.push_back(DAG.getUNDEF(ObjectVT));
120 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
121 unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
122 MF.getRegInfo().addLiveIn(*CurArgReg++, VReg);
123 SDValue Arg = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
124 if (ObjectVT != MVT::i32) {
125 unsigned AssertOp = ISD::AssertSext;
126 Arg = DAG.getNode(AssertOp, dl, MVT::i32, Arg,
127 DAG.getValueType(ObjectVT));
128 Arg = DAG.getNode(ISD::TRUNCATE, dl, ObjectVT, Arg);
130 InVals.push_back(Arg);
132 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset,
134 SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
136 if (ObjectVT == MVT::i32) {
137 Load = DAG.getLoad(MVT::i32, dl, Chain, FIPtr, NULL, 0);
139 ISD::LoadExtType LoadOp = ISD::SEXTLOAD;
141 // Sparc is big endian, so add an offset based on the ObjectVT.
142 unsigned Offset = 4-std::max(1U, ObjectVT.getSizeInBits()/8);
143 FIPtr = DAG.getNode(ISD::ADD, dl, MVT::i32, FIPtr,
144 DAG.getConstant(Offset, MVT::i32));
145 Load = DAG.getExtLoad(LoadOp, dl, MVT::i32, Chain, FIPtr,
147 Load = DAG.getNode(ISD::TRUNCATE, dl, ObjectVT, Load);
149 InVals.push_back(Load);
155 if (!Ins[i].Used) { // Argument is dead.
156 if (CurArgReg < ArgRegEnd) ++CurArgReg;
157 InVals.push_back(DAG.getUNDEF(ObjectVT));
158 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
159 // FP value is passed in an integer register.
160 unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
161 MF.getRegInfo().addLiveIn(*CurArgReg++, VReg);
162 SDValue Arg = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
164 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, Arg);
165 InVals.push_back(Arg);
167 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset,
169 SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
170 SDValue Load = DAG.getLoad(MVT::f32, dl, Chain, FIPtr, NULL, 0);
171 InVals.push_back(Load);
178 if (!Ins[i].Used) { // Argument is dead.
179 if (CurArgReg < ArgRegEnd) ++CurArgReg;
180 if (CurArgReg < ArgRegEnd) ++CurArgReg;
181 InVals.push_back(DAG.getUNDEF(ObjectVT));
184 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
185 unsigned VRegHi = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
186 MF.getRegInfo().addLiveIn(*CurArgReg++, VRegHi);
187 HiVal = DAG.getCopyFromReg(Chain, dl, VRegHi, MVT::i32);
189 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset,
191 SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
192 HiVal = DAG.getLoad(MVT::i32, dl, Chain, FIPtr, NULL, 0);
196 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
197 unsigned VRegLo = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
198 MF.getRegInfo().addLiveIn(*CurArgReg++, VRegLo);
199 LoVal = DAG.getCopyFromReg(Chain, dl, VRegLo, MVT::i32);
201 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4,
203 SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
204 LoVal = DAG.getLoad(MVT::i32, dl, Chain, FIPtr, NULL, 0);
207 // Compose the two halves together into an i64 unit.
209 DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, LoVal, HiVal);
211 // If we want a double, do a bit convert.
212 if (ObjectVT == MVT::f64)
213 WholeValue = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, WholeValue);
215 InVals.push_back(WholeValue);
222 // Store remaining ArgRegs to the stack if this is a varargs function.
224 // Remember the vararg offset for the va_start implementation.
225 VarArgsFrameOffset = ArgOffset;
227 std::vector<SDValue> OutChains;
229 for (; CurArgReg != ArgRegEnd; ++CurArgReg) {
230 unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
231 MF.getRegInfo().addLiveIn(*CurArgReg, VReg);
232 SDValue Arg = DAG.getCopyFromReg(DAG.getRoot(), dl, VReg, MVT::i32);
234 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset,
236 SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
238 OutChains.push_back(DAG.getStore(DAG.getRoot(), dl, Arg, FIPtr, NULL, 0));
242 if (!OutChains.empty()) {
243 OutChains.push_back(Chain);
244 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
245 &OutChains[0], OutChains.size());
253 SparcTargetLowering::LowerCall(SDValue Chain, SDValue Callee, const Type *RetTy,
254 CallingConv::ID CallConv, bool isVarArg,
256 const SmallVectorImpl<ISD::OutputArg> &Outs,
257 const SmallVectorImpl<ISD::InputArg> &Ins,
258 DebugLoc dl, SelectionDAG &DAG,
259 SmallVectorImpl<SDValue> &InVals) {
260 // Sparc target does not yet support tail call optimization.
264 // Analyze operands of the call, assigning locations to each operand.
265 SmallVector<CCValAssign, 16> ArgLocs;
266 CCState CCInfo(CallConv, isVarArg, DAG.getTarget(), ArgLocs);
267 CCInfo.AnalyzeCallOperands(Outs, CC_Sparc32);
269 // Get the size of the outgoing arguments stack space requirement.
270 unsigned ArgsSize = CCInfo.getNextStackOffset();
271 // FIXME: We can't use this until f64 is known to take two GPRs.
275 // Count the size of the outgoing arguments.
276 unsigned ArgsSize = 0;
277 for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
278 switch (Outs[i].Val.getValueType().getSimpleVT().SimpleTy) {
279 default: llvm_unreachable("Unknown value type!");
294 ArgsSize -= 4*6; // Space for first 6 arguments is prereserved.
299 // Keep stack frames 8-byte aligned.
300 ArgsSize = (ArgsSize+7) & ~7;
302 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(ArgsSize, true));
304 SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
305 SmallVector<SDValue, 8> MemOpChains;
308 // Walk the register/memloc assignments, inserting copies/loads.
309 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
310 CCValAssign &VA = ArgLocs[i];
311 SDValue Arg = Outs[i].Val;
313 // Promote the value if needed.
314 switch (VA.getLocInfo()) {
315 default: llvm_unreachable("Unknown loc info!");
316 case CCValAssign::Full: break;
317 case CCValAssign::SExt:
318 Arg = DAG.getNode(ISD::SIGN_EXTEND, VA.getLocVT(), Arg);
320 case CCValAssign::ZExt:
321 Arg = DAG.getNode(ISD::ZERO_EXTEND, VA.getLocVT(), Arg);
323 case CCValAssign::AExt:
324 Arg = DAG.getNode(ISD::ANY_EXTEND, VA.getLocVT(), Arg);
328 // Arguments that can be passed on register must be kept at
331 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
335 assert(VA.isMemLoc());
337 // Create a store off the stack pointer for this argument.
338 SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32);
339 // FIXME: VERIFY THAT 68 IS RIGHT.
340 SDValue PtrOff = DAG.getIntPtrConstant(VA.getLocMemOffset()+68);
341 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
342 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
346 static const unsigned ArgRegs[] = {
347 SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5
349 unsigned ArgOffset = 68;
351 for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
352 SDValue Val = Outs[i].Val;
353 EVT ObjectVT = Val.getValueType();
354 SDValue ValToStore(0, 0);
356 switch (ObjectVT.getSimpleVT().SimpleTy) {
357 default: llvm_unreachable("Unhandled argument type!");
361 if (RegsToPass.size() >= 6) {
364 RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Val));
369 if (RegsToPass.size() >= 6) {
372 // Convert this to a FP value in an int reg.
373 Val = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Val);
374 RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Val));
379 if (RegsToPass.size() >= 6) {
380 ValToStore = Val; // Whole thing is passed in memory.
384 // Break into top and bottom parts by storing to the stack and loading
385 // out the parts as integers. Top part goes in a reg.
386 SDValue StackPtr = DAG.CreateStackTemporary(MVT::f64, MVT::i32);
387 SDValue Store = DAG.getStore(DAG.getEntryNode(), dl,
388 Val, StackPtr, NULL, 0);
389 // Sparc is big-endian, so the high part comes first.
390 SDValue Hi = DAG.getLoad(MVT::i32, dl, Store, StackPtr, NULL, 0, 0);
391 // Increment the pointer to the other half.
392 StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
393 DAG.getIntPtrConstant(4));
394 // Load the low part.
395 SDValue Lo = DAG.getLoad(MVT::i32, dl, Store, StackPtr, NULL, 0, 0);
397 RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Hi));
399 if (RegsToPass.size() >= 6) {
404 RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Lo));
410 if (RegsToPass.size() >= 6) {
411 ValToStore = Val; // Whole thing is passed in memory.
415 // Split the value into top and bottom part. Top part goes in a reg.
416 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Val,
417 DAG.getConstant(1, MVT::i32));
418 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Val,
419 DAG.getConstant(0, MVT::i32));
420 RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Hi));
422 if (RegsToPass.size() >= 6) {
427 RegsToPass.push_back(std::make_pair(ArgRegs[RegsToPass.size()], Lo));
433 if (ValToStore.getNode()) {
434 SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32);
435 SDValue PtrOff = DAG.getConstant(ArgOffset, MVT::i32);
436 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff);
437 MemOpChains.push_back(DAG.getStore(Chain, dl, ValToStore,
440 ArgOffset += ObjSize;
444 // Emit all stores, make sure the occur before any copies into physregs.
445 if (!MemOpChains.empty())
446 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
447 &MemOpChains[0], MemOpChains.size());
449 // Build a sequence of copy-to-reg nodes chained together with token
450 // chain and flag operands which copy the outgoing args into registers.
451 // The InFlag in necessary since all emited instructions must be
454 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
455 unsigned Reg = RegsToPass[i].first;
456 // Remap I0->I7 -> O0->O7.
457 if (Reg >= SP::I0 && Reg <= SP::I7)
458 Reg = Reg-SP::I0+SP::O0;
460 Chain = DAG.getCopyToReg(Chain, dl, Reg, RegsToPass[i].second, InFlag);
461 InFlag = Chain.getValue(1);
464 // If the callee is a GlobalAddress node (quite common, every direct call is)
465 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
466 // Likewise ExternalSymbol -> TargetExternalSymbol.
467 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
468 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
469 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
470 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32);
472 std::vector<EVT> NodeTys;
473 NodeTys.push_back(MVT::Other); // Returns a chain
474 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
475 SDValue Ops[] = { Chain, Callee, InFlag };
476 Chain = DAG.getNode(SPISD::CALL, dl, NodeTys, Ops, InFlag.getNode() ? 3 : 2);
477 InFlag = Chain.getValue(1);
479 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(ArgsSize, true),
480 DAG.getIntPtrConstant(0, true), InFlag);
481 InFlag = Chain.getValue(1);
483 // Assign locations to each value returned by this call.
484 SmallVector<CCValAssign, 16> RVLocs;
485 CCState RVInfo(CallConv, isVarArg, DAG.getTarget(),
486 RVLocs, *DAG.getContext());
488 RVInfo.AnalyzeCallResult(Ins, RetCC_Sparc32);
490 // Copy all of the result registers out of their specified physreg.
491 for (unsigned i = 0; i != RVLocs.size(); ++i) {
492 unsigned Reg = RVLocs[i].getLocReg();
494 // Remap I0->I7 -> O0->O7.
495 if (Reg >= SP::I0 && Reg <= SP::I7)
496 Reg = Reg-SP::I0+SP::O0;
498 Chain = DAG.getCopyFromReg(Chain, dl, Reg,
499 RVLocs[i].getValVT(), InFlag).getValue(1);
500 InFlag = Chain.getValue(2);
501 InVals.push_back(Chain.getValue(0));
509 //===----------------------------------------------------------------------===//
510 // TargetLowering Implementation
511 //===----------------------------------------------------------------------===//
513 /// IntCondCCodeToICC - Convert a DAG integer condition code to a SPARC ICC
515 static SPCC::CondCodes IntCondCCodeToICC(ISD::CondCode CC) {
517 default: llvm_unreachable("Unknown integer condition code!");
518 case ISD::SETEQ: return SPCC::ICC_E;
519 case ISD::SETNE: return SPCC::ICC_NE;
520 case ISD::SETLT: return SPCC::ICC_L;
521 case ISD::SETGT: return SPCC::ICC_G;
522 case ISD::SETLE: return SPCC::ICC_LE;
523 case ISD::SETGE: return SPCC::ICC_GE;
524 case ISD::SETULT: return SPCC::ICC_CS;
525 case ISD::SETULE: return SPCC::ICC_LEU;
526 case ISD::SETUGT: return SPCC::ICC_GU;
527 case ISD::SETUGE: return SPCC::ICC_CC;
531 /// FPCondCCodeToFCC - Convert a DAG floatingp oint condition code to a SPARC
533 static SPCC::CondCodes FPCondCCodeToFCC(ISD::CondCode CC) {
535 default: llvm_unreachable("Unknown fp condition code!");
537 case ISD::SETOEQ: return SPCC::FCC_E;
539 case ISD::SETUNE: return SPCC::FCC_NE;
541 case ISD::SETOLT: return SPCC::FCC_L;
543 case ISD::SETOGT: return SPCC::FCC_G;
545 case ISD::SETOLE: return SPCC::FCC_LE;
547 case ISD::SETOGE: return SPCC::FCC_GE;
548 case ISD::SETULT: return SPCC::FCC_UL;
549 case ISD::SETULE: return SPCC::FCC_ULE;
550 case ISD::SETUGT: return SPCC::FCC_UG;
551 case ISD::SETUGE: return SPCC::FCC_UGE;
552 case ISD::SETUO: return SPCC::FCC_U;
553 case ISD::SETO: return SPCC::FCC_O;
554 case ISD::SETONE: return SPCC::FCC_LG;
555 case ISD::SETUEQ: return SPCC::FCC_UE;
559 SparcTargetLowering::SparcTargetLowering(TargetMachine &TM)
560 : TargetLowering(TM, new TargetLoweringObjectFileELF()) {
562 // Set up the register classes.
563 addRegisterClass(MVT::i32, SP::IntRegsRegisterClass);
564 addRegisterClass(MVT::f32, SP::FPRegsRegisterClass);
565 addRegisterClass(MVT::f64, SP::DFPRegsRegisterClass);
567 // Turn FP extload into load/fextend
568 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
569 // Sparc doesn't have i1 sign extending load
570 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
571 // Turn FP truncstore into trunc + store.
572 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
574 // Custom legalize GlobalAddress nodes into LO/HI parts.
575 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
576 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
577 setOperationAction(ISD::ConstantPool , MVT::i32, Custom);
579 // Sparc doesn't have sext_inreg, replace them with shl/sra
580 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
581 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand);
582 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
584 // Sparc has no REM or DIVREM operations.
585 setOperationAction(ISD::UREM, MVT::i32, Expand);
586 setOperationAction(ISD::SREM, MVT::i32, Expand);
587 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
588 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
590 // Custom expand fp<->sint
591 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
592 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
595 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
596 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
598 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
599 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
601 // Sparc has no select or setcc: expand to SELECT_CC.
602 setOperationAction(ISD::SELECT, MVT::i32, Expand);
603 setOperationAction(ISD::SELECT, MVT::f32, Expand);
604 setOperationAction(ISD::SELECT, MVT::f64, Expand);
605 setOperationAction(ISD::SETCC, MVT::i32, Expand);
606 setOperationAction(ISD::SETCC, MVT::f32, Expand);
607 setOperationAction(ISD::SETCC, MVT::f64, Expand);
609 // Sparc doesn't have BRCOND either, it has BR_CC.
610 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
611 setOperationAction(ISD::BRIND, MVT::Other, Expand);
612 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
613 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
614 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
615 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
617 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
618 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
619 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
621 // SPARC has no intrinsics for these particular operations.
622 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
624 setOperationAction(ISD::FSIN , MVT::f64, Expand);
625 setOperationAction(ISD::FCOS , MVT::f64, Expand);
626 setOperationAction(ISD::FREM , MVT::f64, Expand);
627 setOperationAction(ISD::FSIN , MVT::f32, Expand);
628 setOperationAction(ISD::FCOS , MVT::f32, Expand);
629 setOperationAction(ISD::FREM , MVT::f32, Expand);
630 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
631 setOperationAction(ISD::CTTZ , MVT::i32, Expand);
632 setOperationAction(ISD::CTLZ , MVT::i32, Expand);
633 setOperationAction(ISD::ROTL , MVT::i32, Expand);
634 setOperationAction(ISD::ROTR , MVT::i32, Expand);
635 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
636 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
637 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
638 setOperationAction(ISD::FPOW , MVT::f64, Expand);
639 setOperationAction(ISD::FPOW , MVT::f32, Expand);
641 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
642 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
643 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
645 // FIXME: Sparc provides these multiplies, but we don't have them yet.
646 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
647 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
649 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
651 // VASTART needs to be custom lowered to use the VarArgsFrameIndex.
652 setOperationAction(ISD::VASTART , MVT::Other, Custom);
653 // VAARG needs to be lowered to not do unaligned accesses for doubles.
654 setOperationAction(ISD::VAARG , MVT::Other, Custom);
656 // Use the default implementation.
657 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
658 setOperationAction(ISD::VAEND , MVT::Other, Expand);
659 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
660 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
661 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
663 // No debug info support yet.
664 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
666 setStackPointerRegisterToSaveRestore(SP::O6);
668 if (TM.getSubtarget<SparcSubtarget>().isV9())
669 setOperationAction(ISD::CTPOP, MVT::i32, Legal);
671 computeRegisterProperties();
674 const char *SparcTargetLowering::getTargetNodeName(unsigned Opcode) const {
677 case SPISD::CMPICC: return "SPISD::CMPICC";
678 case SPISD::CMPFCC: return "SPISD::CMPFCC";
679 case SPISD::BRICC: return "SPISD::BRICC";
680 case SPISD::BRFCC: return "SPISD::BRFCC";
681 case SPISD::SELECT_ICC: return "SPISD::SELECT_ICC";
682 case SPISD::SELECT_FCC: return "SPISD::SELECT_FCC";
683 case SPISD::Hi: return "SPISD::Hi";
684 case SPISD::Lo: return "SPISD::Lo";
685 case SPISD::FTOI: return "SPISD::FTOI";
686 case SPISD::ITOF: return "SPISD::ITOF";
687 case SPISD::CALL: return "SPISD::CALL";
688 case SPISD::RET_FLAG: return "SPISD::RET_FLAG";
692 /// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to
693 /// be zero. Op is expected to be a target specific node. Used by DAG
695 void SparcTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
699 const SelectionDAG &DAG,
700 unsigned Depth) const {
701 APInt KnownZero2, KnownOne2;
702 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0); // Don't know anything.
704 switch (Op.getOpcode()) {
706 case SPISD::SELECT_ICC:
707 case SPISD::SELECT_FCC:
708 DAG.ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne,
710 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2,
712 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
713 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
715 // Only known if known in both the LHS and RHS.
716 KnownOne &= KnownOne2;
717 KnownZero &= KnownZero2;
722 // Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so
723 // set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition.
724 static void LookThroughSetCC(SDValue &LHS, SDValue &RHS,
725 ISD::CondCode CC, unsigned &SPCC) {
726 if (isa<ConstantSDNode>(RHS) &&
727 cast<ConstantSDNode>(RHS)->getZExtValue() == 0 &&
729 ((LHS.getOpcode() == SPISD::SELECT_ICC &&
730 LHS.getOperand(3).getOpcode() == SPISD::CMPICC) ||
731 (LHS.getOpcode() == SPISD::SELECT_FCC &&
732 LHS.getOperand(3).getOpcode() == SPISD::CMPFCC)) &&
733 isa<ConstantSDNode>(LHS.getOperand(0)) &&
734 isa<ConstantSDNode>(LHS.getOperand(1)) &&
735 cast<ConstantSDNode>(LHS.getOperand(0))->getZExtValue() == 1 &&
736 cast<ConstantSDNode>(LHS.getOperand(1))->getZExtValue() == 0) {
737 SDValue CMPCC = LHS.getOperand(3);
738 SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getZExtValue();
739 LHS = CMPCC.getOperand(0);
740 RHS = CMPCC.getOperand(1);
744 SDValue SparcTargetLowering::LowerGlobalAddress(SDValue Op,
746 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
747 // FIXME there isn't really any debug info here
748 DebugLoc dl = Op.getDebugLoc();
749 SDValue GA = DAG.getTargetGlobalAddress(GV, MVT::i32);
750 SDValue Hi = DAG.getNode(SPISD::Hi, dl, MVT::i32, GA);
751 SDValue Lo = DAG.getNode(SPISD::Lo, dl, MVT::i32, GA);
753 if (getTargetMachine().getRelocationModel() != Reloc::PIC_)
754 return DAG.getNode(ISD::ADD, dl, MVT::i32, Lo, Hi);
756 SDValue GlobalBase = DAG.getNode(SPISD::GLOBAL_BASE_REG, dl,
758 SDValue RelAddr = DAG.getNode(ISD::ADD, dl, MVT::i32, Lo, Hi);
759 SDValue AbsAddr = DAG.getNode(ISD::ADD, dl, MVT::i32,
760 GlobalBase, RelAddr);
761 return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
765 SDValue SparcTargetLowering::LowerConstantPool(SDValue Op,
767 ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
768 // FIXME there isn't really any debug info here
769 DebugLoc dl = Op.getDebugLoc();
770 Constant *C = N->getConstVal();
771 SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment());
772 SDValue Hi = DAG.getNode(SPISD::Hi, dl, MVT::i32, CP);
773 SDValue Lo = DAG.getNode(SPISD::Lo, dl, MVT::i32, CP);
774 if (getTargetMachine().getRelocationModel() != Reloc::PIC_)
775 return DAG.getNode(ISD::ADD, dl, MVT::i32, Lo, Hi);
777 SDValue GlobalBase = DAG.getNode(SPISD::GLOBAL_BASE_REG, dl,
779 SDValue RelAddr = DAG.getNode(ISD::ADD, dl, MVT::i32, Lo, Hi);
780 SDValue AbsAddr = DAG.getNode(ISD::ADD, dl, MVT::i32,
781 GlobalBase, RelAddr);
782 return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
786 static SDValue LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) {
787 DebugLoc dl = Op.getDebugLoc();
788 // Convert the fp value to integer in an FP register.
789 assert(Op.getValueType() == MVT::i32);
790 Op = DAG.getNode(SPISD::FTOI, dl, MVT::f32, Op.getOperand(0));
791 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Op);
794 static SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
795 DebugLoc dl = Op.getDebugLoc();
796 assert(Op.getOperand(0).getValueType() == MVT::i32);
797 SDValue Tmp = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, Op.getOperand(0));
798 // Convert the int value to FP in an FP register.
799 return DAG.getNode(SPISD::ITOF, dl, Op.getValueType(), Tmp);
802 static SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
803 SDValue Chain = Op.getOperand(0);
804 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
805 SDValue LHS = Op.getOperand(2);
806 SDValue RHS = Op.getOperand(3);
807 SDValue Dest = Op.getOperand(4);
808 DebugLoc dl = Op.getDebugLoc();
809 unsigned Opc, SPCC = ~0U;
811 // If this is a br_cc of a "setcc", and if the setcc got lowered into
812 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
813 LookThroughSetCC(LHS, RHS, CC, SPCC);
815 // Get the condition flag.
817 if (LHS.getValueType() == MVT::i32) {
818 std::vector<EVT> VTs;
819 VTs.push_back(MVT::i32);
820 VTs.push_back(MVT::Flag);
821 SDValue Ops[2] = { LHS, RHS };
822 CompareFlag = DAG.getNode(SPISD::CMPICC, dl, VTs, Ops, 2).getValue(1);
823 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC);
826 CompareFlag = DAG.getNode(SPISD::CMPFCC, dl, MVT::Flag, LHS, RHS);
827 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC);
830 return DAG.getNode(Opc, dl, MVT::Other, Chain, Dest,
831 DAG.getConstant(SPCC, MVT::i32), CompareFlag);
834 static SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
835 SDValue LHS = Op.getOperand(0);
836 SDValue RHS = Op.getOperand(1);
837 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
838 SDValue TrueVal = Op.getOperand(2);
839 SDValue FalseVal = Op.getOperand(3);
840 DebugLoc dl = Op.getDebugLoc();
841 unsigned Opc, SPCC = ~0U;
843 // If this is a select_cc of a "setcc", and if the setcc got lowered into
844 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
845 LookThroughSetCC(LHS, RHS, CC, SPCC);
848 if (LHS.getValueType() == MVT::i32) {
849 std::vector<EVT> VTs;
850 VTs.push_back(LHS.getValueType()); // subcc returns a value
851 VTs.push_back(MVT::Flag);
852 SDValue Ops[2] = { LHS, RHS };
853 CompareFlag = DAG.getNode(SPISD::CMPICC, dl, VTs, Ops, 2).getValue(1);
854 Opc = SPISD::SELECT_ICC;
855 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC);
857 CompareFlag = DAG.getNode(SPISD::CMPFCC, dl, MVT::Flag, LHS, RHS);
858 Opc = SPISD::SELECT_FCC;
859 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC);
861 return DAG.getNode(Opc, dl, TrueVal.getValueType(), TrueVal, FalseVal,
862 DAG.getConstant(SPCC, MVT::i32), CompareFlag);
865 static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
866 SparcTargetLowering &TLI) {
867 // vastart just stores the address of the VarArgsFrameIndex slot into the
868 // memory location argument.
869 DebugLoc dl = Op.getDebugLoc();
870 SDValue Offset = DAG.getNode(ISD::ADD, dl, MVT::i32,
871 DAG.getRegister(SP::I6, MVT::i32),
872 DAG.getConstant(TLI.getVarArgsFrameOffset(),
874 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
875 return DAG.getStore(Op.getOperand(0), dl, Offset, Op.getOperand(1), SV, 0);
878 static SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG) {
879 SDNode *Node = Op.getNode();
880 EVT VT = Node->getValueType(0);
881 SDValue InChain = Node->getOperand(0);
882 SDValue VAListPtr = Node->getOperand(1);
883 const Value *SV = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
884 DebugLoc dl = Node->getDebugLoc();
885 SDValue VAList = DAG.getLoad(MVT::i32, dl, InChain, VAListPtr, SV, 0);
886 // Increment the pointer, VAList, to the next vaarg
887 SDValue NextPtr = DAG.getNode(ISD::ADD, dl, MVT::i32, VAList,
888 DAG.getConstant(VT.getSizeInBits()/8,
890 // Store the incremented VAList to the legalized pointer
891 InChain = DAG.getStore(VAList.getValue(1), dl, NextPtr,
893 // Load the actual argument out of the pointer VAList, unless this is an
896 return DAG.getLoad(VT, dl, InChain, VAList, NULL, 0);
898 // Otherwise, load it as i64, then do a bitconvert.
899 SDValue V = DAG.getLoad(MVT::i64, dl, InChain, VAList, NULL, 0);
901 // Bit-Convert the value to f64.
903 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, V),
906 return DAG.getMergeValues(Ops, 2, dl);
909 static SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) {
910 SDValue Chain = Op.getOperand(0); // Legalize the chain.
911 SDValue Size = Op.getOperand(1); // Legalize the size.
912 DebugLoc dl = Op.getDebugLoc();
914 unsigned SPReg = SP::O6;
915 SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, MVT::i32);
916 SDValue NewSP = DAG.getNode(ISD::SUB, dl, MVT::i32, SP, Size); // Value
917 Chain = DAG.getCopyToReg(SP.getValue(1), dl, SPReg, NewSP); // Output chain
919 // The resultant pointer is actually 16 words from the bottom of the stack,
920 // to provide a register spill area.
921 SDValue NewVal = DAG.getNode(ISD::ADD, dl, MVT::i32, NewSP,
922 DAG.getConstant(96, MVT::i32));
923 SDValue Ops[2] = { NewVal, Chain };
924 return DAG.getMergeValues(Ops, 2, dl);
928 SDValue SparcTargetLowering::
929 LowerOperation(SDValue Op, SelectionDAG &DAG) {
930 switch (Op.getOpcode()) {
931 default: llvm_unreachable("Should not custom lower this!");
932 // Frame & Return address. Currently unimplemented
933 case ISD::RETURNADDR: return SDValue();
934 case ISD::FRAMEADDR: return SDValue();
935 case ISD::GlobalTLSAddress:
936 llvm_unreachable("TLS not implemented for Sparc.");
937 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
938 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
939 case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
940 case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
941 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
942 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
943 case ISD::VASTART: return LowerVASTART(Op, DAG, *this);
944 case ISD::VAARG: return LowerVAARG(Op, DAG);
945 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
950 SparcTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
951 MachineBasicBlock *BB,
952 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
953 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
956 DebugLoc dl = MI->getDebugLoc();
957 // Figure out the conditional branch opcode to use for this select_cc.
958 switch (MI->getOpcode()) {
959 default: llvm_unreachable("Unknown SELECT_CC!");
960 case SP::SELECT_CC_Int_ICC:
961 case SP::SELECT_CC_FP_ICC:
962 case SP::SELECT_CC_DFP_ICC:
963 BROpcode = SP::BCOND;
965 case SP::SELECT_CC_Int_FCC:
966 case SP::SELECT_CC_FP_FCC:
967 case SP::SELECT_CC_DFP_FCC:
968 BROpcode = SP::FBCOND;
972 CC = (SPCC::CondCodes)MI->getOperand(3).getImm();
974 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
975 // control-flow pattern. The incoming instruction knows the destination vreg
976 // to set, the condition code register to branch on, the true/false values to
977 // select between, and a branch opcode to use.
978 const BasicBlock *LLVM_BB = BB->getBasicBlock();
979 MachineFunction::iterator It = BB;
986 // fallthrough --> copy0MBB
987 MachineBasicBlock *thisMBB = BB;
988 MachineFunction *F = BB->getParent();
989 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
990 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
991 BuildMI(BB, dl, TII.get(BROpcode)).addMBB(sinkMBB).addImm(CC);
992 F->insert(It, copy0MBB);
993 F->insert(It, sinkMBB);
994 // Update machine-CFG edges by first adding all successors of the current
995 // block to the new block which will contain the Phi node for the select.
996 // Also inform sdisel of the edge changes.
997 for (MachineBasicBlock::succ_iterator I = BB->succ_begin(),
998 E = BB->succ_end(); I != E; ++I) {
999 EM->insert(std::make_pair(*I, sinkMBB));
1000 sinkMBB->addSuccessor(*I);
1002 // Next, remove all successors of the current block, and add the true
1003 // and fallthrough blocks as its successors.
1004 while (!BB->succ_empty())
1005 BB->removeSuccessor(BB->succ_begin());
1006 // Next, add the true and fallthrough blocks as its successors.
1007 BB->addSuccessor(copy0MBB);
1008 BB->addSuccessor(sinkMBB);
1011 // %FalseValue = ...
1012 // # fallthrough to sinkMBB
1015 // Update machine-CFG edges
1016 BB->addSuccessor(sinkMBB);
1019 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1022 BuildMI(BB, dl, TII.get(SP::PHI), MI->getOperand(0).getReg())
1023 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
1024 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
1026 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
1030 //===----------------------------------------------------------------------===//
1031 // Sparc Inline Assembly Support
1032 //===----------------------------------------------------------------------===//
1034 /// getConstraintType - Given a constraint letter, return the type of
1035 /// constraint it is for this target.
1036 SparcTargetLowering::ConstraintType
1037 SparcTargetLowering::getConstraintType(const std::string &Constraint) const {
1038 if (Constraint.size() == 1) {
1039 switch (Constraint[0]) {
1041 case 'r': return C_RegisterClass;
1045 return TargetLowering::getConstraintType(Constraint);
1048 std::pair<unsigned, const TargetRegisterClass*>
1049 SparcTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
1051 if (Constraint.size() == 1) {
1052 switch (Constraint[0]) {
1054 return std::make_pair(0U, SP::IntRegsRegisterClass);
1058 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
1061 std::vector<unsigned> SparcTargetLowering::
1062 getRegClassForInlineAsmConstraint(const std::string &Constraint,
1064 if (Constraint.size() != 1)
1065 return std::vector<unsigned>();
1067 switch (Constraint[0]) {
1070 return make_vector<unsigned>(SP::L0, SP::L1, SP::L2, SP::L3,
1071 SP::L4, SP::L5, SP::L6, SP::L7,
1072 SP::I0, SP::I1, SP::I2, SP::I3,
1074 SP::O0, SP::O1, SP::O2, SP::O3,
1075 SP::O4, SP::O5, SP::O7, 0);
1078 return std::vector<unsigned>();
1082 SparcTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
1083 // The Sparc target isn't yet aware of offsets.
1087 /// getFunctionAlignment - Return the Log2 alignment of this function.
1088 unsigned SparcTargetLowering::getFunctionAlignment(const Function *) const {