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"
27 //===----------------------------------------------------------------------===//
28 // Calling Convention Implementation
29 //===----------------------------------------------------------------------===//
31 #include "SparcGenCallingConv.inc"
33 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
34 // CCValAssign - represent the assignment of the return value to locations.
35 SmallVector<CCValAssign, 16> RVLocs;
36 unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
37 bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
39 // CCState - Info about the registers and stack slot.
40 CCState CCInfo(CC, isVarArg, DAG.getTarget(), RVLocs);
42 // Analize return values of ISD::RET
43 CCInfo.AnalyzeReturn(Op.Val, RetCC_Sparc32);
45 // If this is the first return lowered for this function, add the regs to the
46 // liveout set for the function.
47 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
48 for (unsigned i = 0; i != RVLocs.size(); ++i)
49 if (RVLocs[i].isRegLoc())
50 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
53 SDOperand Chain = Op.getOperand(0);
56 // Copy the result values into the output registers.
57 for (unsigned i = 0; i != RVLocs.size(); ++i) {
58 CCValAssign &VA = RVLocs[i];
59 assert(VA.isRegLoc() && "Can only return in registers!");
61 // ISD::RET => ret chain, (regnum1,val1), ...
62 // So i*2+1 index only the regnums.
63 Chain = DAG.getCopyToReg(Chain, VA.getLocReg(), Op.getOperand(i*2+1), Flag);
65 // Guarantee that all emitted copies are stuck together with flags.
66 Flag = Chain.getValue(1);
70 return DAG.getNode(SPISD::RET_FLAG, MVT::Other, Chain, Flag);
71 return DAG.getNode(SPISD::RET_FLAG, MVT::Other, Chain);
74 /// LowerArguments - V8 uses a very simple ABI, where all values are passed in
75 /// either one or two GPRs, including FP values. TODO: we should pass FP values
76 /// in FP registers for fastcc functions.
77 std::vector<SDOperand>
78 SparcTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
79 MachineFunction &MF = DAG.getMachineFunction();
80 MachineRegisterInfo &RegInfo = MF.getRegInfo();
81 std::vector<SDOperand> ArgValues;
83 static const unsigned ArgRegs[] = {
84 SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5
87 const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6;
88 unsigned ArgOffset = 68;
90 SDOperand Root = DAG.getRoot();
91 std::vector<SDOperand> OutChains;
93 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
94 MVT::ValueType ObjectVT = getValueType(I->getType());
97 default: assert(0 && "Unhandled argument type!");
102 if (I->use_empty()) { // Argument is dead.
103 if (CurArgReg < ArgRegEnd) ++CurArgReg;
104 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
105 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
106 unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
107 MF.getRegInfo().addLiveIn(*CurArgReg++, VReg);
108 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
109 if (ObjectVT != MVT::i32) {
110 unsigned AssertOp = ISD::AssertSext;
111 Arg = DAG.getNode(AssertOp, MVT::i32, Arg,
112 DAG.getValueType(ObjectVT));
113 Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg);
115 ArgValues.push_back(Arg);
117 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
118 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
120 if (ObjectVT == MVT::i32) {
121 Load = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0);
123 ISD::LoadExtType LoadOp = ISD::SEXTLOAD;
125 // Sparc is big endian, so add an offset based on the ObjectVT.
126 unsigned Offset = 4-std::max(1U, MVT::getSizeInBits(ObjectVT)/8);
127 FIPtr = DAG.getNode(ISD::ADD, MVT::i32, FIPtr,
128 DAG.getConstant(Offset, MVT::i32));
129 Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr,
131 Load = DAG.getNode(ISD::TRUNCATE, ObjectVT, Load);
133 ArgValues.push_back(Load);
139 if (I->use_empty()) { // Argument is dead.
140 if (CurArgReg < ArgRegEnd) ++CurArgReg;
141 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
142 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
143 // FP value is passed in an integer register.
144 unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
145 MF.getRegInfo().addLiveIn(*CurArgReg++, VReg);
146 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
148 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Arg);
149 ArgValues.push_back(Arg);
151 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
152 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
153 SDOperand Load = DAG.getLoad(MVT::f32, Root, FIPtr, NULL, 0);
154 ArgValues.push_back(Load);
161 if (I->use_empty()) { // Argument is dead.
162 if (CurArgReg < ArgRegEnd) ++CurArgReg;
163 if (CurArgReg < ArgRegEnd) ++CurArgReg;
164 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
167 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
168 unsigned VRegHi = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
169 MF.getRegInfo().addLiveIn(*CurArgReg++, VRegHi);
170 HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32);
172 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
173 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
174 HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0);
178 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
179 unsigned VRegLo = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
180 MF.getRegInfo().addLiveIn(*CurArgReg++, VRegLo);
181 LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32);
183 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4);
184 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
185 LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0);
188 // Compose the two halves together into an i64 unit.
189 SDOperand WholeValue =
190 DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal);
192 // If we want a double, do a bit convert.
193 if (ObjectVT == MVT::f64)
194 WholeValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, WholeValue);
196 ArgValues.push_back(WholeValue);
203 // Store remaining ArgRegs to the stack if this is a varargs function.
205 // Remember the vararg offset for the va_start implementation.
206 VarArgsFrameOffset = ArgOffset;
208 for (; CurArgReg != ArgRegEnd; ++CurArgReg) {
209 unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass);
210 MF.getRegInfo().addLiveIn(*CurArgReg, VReg);
211 SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
213 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
214 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
216 OutChains.push_back(DAG.getStore(DAG.getRoot(), Arg, FIPtr, NULL, 0));
221 if (!OutChains.empty())
222 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other,
223 &OutChains[0], OutChains.size()));
228 static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG) {
229 unsigned CallingConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
230 SDOperand Chain = Op.getOperand(0);
231 SDOperand Callee = Op.getOperand(4);
232 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
234 // Count the size of the outgoing arguments.
235 unsigned ArgsSize = 0;
236 for (unsigned i = 5, e = Op.getNumOperands(); i != e; i += 2) {
237 switch (Op.getOperand(i).getValueType()) {
238 default: assert(0 && "Unknown value type!");
253 ArgsSize -= 4*6; // Space for first 6 arguments is prereserved.
257 // Keep stack frames 8-byte aligned.
258 ArgsSize = (ArgsSize+7) & ~7;
260 Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(ArgsSize, MVT::i32));
263 std::vector<SDOperand> Stores;
264 std::vector<SDOperand> RegValuesToPass;
265 unsigned ArgOffset = 68;
266 for (unsigned i = 5, e = Op.getNumOperands(); i != e; i += 2) {
267 SDOperand Val = Op.getOperand(i);
268 MVT::ValueType ObjectVT = Val.getValueType();
269 SDOperand ValToStore(0, 0);
272 default: assert(0 && "Unhandled argument type!");
276 if (RegValuesToPass.size() >= 6) {
279 RegValuesToPass.push_back(Val);
284 if (RegValuesToPass.size() >= 6) {
287 // Convert this to a FP value in an int reg.
288 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
289 RegValuesToPass.push_back(Val);
294 // Otherwise, convert this to a FP value in int regs.
295 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Val);
299 if (RegValuesToPass.size() >= 6) {
300 ValToStore = Val; // Whole thing is passed in memory.
304 // Split the value into top and bottom part. Top part goes in a reg.
305 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
306 DAG.getConstant(1, MVT::i32));
307 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
308 DAG.getConstant(0, MVT::i32));
309 RegValuesToPass.push_back(Hi);
311 if (RegValuesToPass.size() >= 6) {
316 RegValuesToPass.push_back(Lo);
321 if (ValToStore.Val) {
323 StackPtr = DAG.getRegister(SP::O6, MVT::i32);
325 SDOperand PtrOff = DAG.getConstant(ArgOffset, MVT::i32);
326 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
327 Stores.push_back(DAG.getStore(Chain, ValToStore, PtrOff, NULL, 0));
329 ArgOffset += ObjSize;
332 // Emit all stores, make sure the occur before any copies into physregs.
334 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &Stores[0],Stores.size());
336 static const unsigned ArgRegs[] = {
337 SP::O0, SP::O1, SP::O2, SP::O3, SP::O4, SP::O5
340 // Build a sequence of copy-to-reg nodes chained together with token chain
341 // and flag operands which copy the outgoing args into O[0-5].
343 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
344 Chain = DAG.getCopyToReg(Chain, ArgRegs[i], RegValuesToPass[i], InFlag);
345 InFlag = Chain.getValue(1);
348 // If the callee is a GlobalAddress node (quite common, every direct call is)
349 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
350 // Likewise ExternalSymbol -> TargetExternalSymbol.
351 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
352 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
353 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
354 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32);
356 std::vector<MVT::ValueType> NodeTys;
357 NodeTys.push_back(MVT::Other); // Returns a chain
358 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
359 SDOperand Ops[] = { Chain, Callee, InFlag };
360 Chain = DAG.getNode(SPISD::CALL, NodeTys, Ops, InFlag.Val ? 3 : 2);
361 InFlag = Chain.getValue(1);
363 Chain = DAG.getCALLSEQ_END(Chain,
364 DAG.getConstant(ArgsSize, MVT::i32),
365 DAG.getConstant(0, MVT::i32), InFlag);
366 InFlag = Chain.getValue(1);
368 // Assign locations to each value returned by this call.
369 SmallVector<CCValAssign, 16> RVLocs;
370 CCState CCInfo(CallingConv, isVarArg, DAG.getTarget(), RVLocs);
372 CCInfo.AnalyzeCallResult(Op.Val, RetCC_Sparc32);
373 SmallVector<SDOperand, 8> ResultVals;
375 // Copy all of the result registers out of their specified physreg.
376 for (unsigned i = 0; i != RVLocs.size(); ++i) {
377 unsigned Reg = RVLocs[i].getLocReg();
379 // Remap I0->I7 -> O0->O7.
380 if (Reg >= SP::I0 && Reg <= SP::I7)
381 Reg = Reg-SP::I0+SP::O0;
383 Chain = DAG.getCopyFromReg(Chain, Reg,
384 RVLocs[i].getValVT(), InFlag).getValue(1);
385 InFlag = Chain.getValue(2);
386 ResultVals.push_back(Chain.getValue(0));
389 ResultVals.push_back(Chain);
391 // Merge everything together with a MERGE_VALUES node.
392 return DAG.getNode(ISD::MERGE_VALUES, Op.Val->getVTList(),
393 &ResultVals[0], ResultVals.size());
398 //===----------------------------------------------------------------------===//
399 // TargetLowering Implementation
400 //===----------------------------------------------------------------------===//
402 /// IntCondCCodeToICC - Convert a DAG integer condition code to a SPARC ICC
404 static SPCC::CondCodes IntCondCCodeToICC(ISD::CondCode CC) {
406 default: assert(0 && "Unknown integer condition code!");
407 case ISD::SETEQ: return SPCC::ICC_E;
408 case ISD::SETNE: return SPCC::ICC_NE;
409 case ISD::SETLT: return SPCC::ICC_L;
410 case ISD::SETGT: return SPCC::ICC_G;
411 case ISD::SETLE: return SPCC::ICC_LE;
412 case ISD::SETGE: return SPCC::ICC_GE;
413 case ISD::SETULT: return SPCC::ICC_CS;
414 case ISD::SETULE: return SPCC::ICC_LEU;
415 case ISD::SETUGT: return SPCC::ICC_GU;
416 case ISD::SETUGE: return SPCC::ICC_CC;
420 /// FPCondCCodeToFCC - Convert a DAG floatingp oint condition code to a SPARC
422 static SPCC::CondCodes FPCondCCodeToFCC(ISD::CondCode CC) {
424 default: assert(0 && "Unknown fp condition code!");
426 case ISD::SETOEQ: return SPCC::FCC_E;
428 case ISD::SETUNE: return SPCC::FCC_NE;
430 case ISD::SETOLT: return SPCC::FCC_L;
432 case ISD::SETOGT: return SPCC::FCC_G;
434 case ISD::SETOLE: return SPCC::FCC_LE;
436 case ISD::SETOGE: return SPCC::FCC_GE;
437 case ISD::SETULT: return SPCC::FCC_UL;
438 case ISD::SETULE: return SPCC::FCC_ULE;
439 case ISD::SETUGT: return SPCC::FCC_UG;
440 case ISD::SETUGE: return SPCC::FCC_UGE;
441 case ISD::SETUO: return SPCC::FCC_U;
442 case ISD::SETO: return SPCC::FCC_O;
443 case ISD::SETONE: return SPCC::FCC_LG;
444 case ISD::SETUEQ: return SPCC::FCC_UE;
449 SparcTargetLowering::SparcTargetLowering(TargetMachine &TM)
450 : TargetLowering(TM) {
452 // Set up the register classes.
453 addRegisterClass(MVT::i32, SP::IntRegsRegisterClass);
454 addRegisterClass(MVT::f32, SP::FPRegsRegisterClass);
455 addRegisterClass(MVT::f64, SP::DFPRegsRegisterClass);
457 // Turn FP extload into load/fextend
458 setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand);
459 // Sparc doesn't have i1 sign extending load
460 setLoadXAction(ISD::SEXTLOAD, MVT::i1, Promote);
461 // Turn FP truncstore into trunc + store.
462 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
464 // Custom legalize GlobalAddress nodes into LO/HI parts.
465 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
466 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
467 setOperationAction(ISD::ConstantPool , MVT::i32, Custom);
469 // Sparc doesn't have sext_inreg, replace them with shl/sra
470 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
471 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand);
472 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
474 // Sparc has no REM or DIVREM operations.
475 setOperationAction(ISD::UREM, MVT::i32, Expand);
476 setOperationAction(ISD::SREM, MVT::i32, Expand);
477 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
478 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
480 // Custom expand fp<->sint
481 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
482 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
485 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
486 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
488 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
489 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
491 // Sparc has no select or setcc: expand to SELECT_CC.
492 setOperationAction(ISD::SELECT, MVT::i32, Expand);
493 setOperationAction(ISD::SELECT, MVT::f32, Expand);
494 setOperationAction(ISD::SELECT, MVT::f64, Expand);
495 setOperationAction(ISD::SETCC, MVT::i32, Expand);
496 setOperationAction(ISD::SETCC, MVT::f32, Expand);
497 setOperationAction(ISD::SETCC, MVT::f64, Expand);
499 // Sparc doesn't have BRCOND either, it has BR_CC.
500 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
501 setOperationAction(ISD::BRIND, MVT::Other, Expand);
502 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
503 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
504 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
505 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
507 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
508 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
509 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
511 // SPARC has no intrinsics for these particular operations.
512 setOperationAction(ISD::MEMMOVE, MVT::Other, Expand);
513 setOperationAction(ISD::MEMSET, MVT::Other, Expand);
514 setOperationAction(ISD::MEMCPY, MVT::Other, Expand);
515 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
517 setOperationAction(ISD::FSIN , MVT::f64, Expand);
518 setOperationAction(ISD::FCOS , MVT::f64, Expand);
519 setOperationAction(ISD::FREM , MVT::f64, Expand);
520 setOperationAction(ISD::FSIN , MVT::f32, Expand);
521 setOperationAction(ISD::FCOS , MVT::f32, Expand);
522 setOperationAction(ISD::FREM , MVT::f32, Expand);
523 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
524 setOperationAction(ISD::CTTZ , MVT::i32, Expand);
525 setOperationAction(ISD::CTLZ , MVT::i32, Expand);
526 setOperationAction(ISD::ROTL , MVT::i32, Expand);
527 setOperationAction(ISD::ROTR , MVT::i32, Expand);
528 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
529 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
530 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
531 setOperationAction(ISD::FPOW , MVT::f64, Expand);
532 setOperationAction(ISD::FPOW , MVT::f32, Expand);
534 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
535 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
536 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
538 // FIXME: Sparc provides these multiplies, but we don't have them yet.
539 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
541 // We don't have line number support yet.
542 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
543 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
544 setOperationAction(ISD::LABEL, MVT::Other, Expand);
546 // RET must be custom lowered, to meet ABI requirements
547 setOperationAction(ISD::RET , MVT::Other, Custom);
549 // VASTART needs to be custom lowered to use the VarArgsFrameIndex.
550 setOperationAction(ISD::VASTART , MVT::Other, Custom);
551 // VAARG needs to be lowered to not do unaligned accesses for doubles.
552 setOperationAction(ISD::VAARG , MVT::Other, Custom);
554 // Use the default implementation.
555 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
556 setOperationAction(ISD::VAEND , MVT::Other, Expand);
557 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
558 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand);
559 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
561 // No debug info support yet.
562 setOperationAction(ISD::LOCATION, MVT::Other, Expand);
563 setOperationAction(ISD::LABEL, MVT::Other, Expand);
564 setOperationAction(ISD::DECLARE, MVT::Other, Expand);
566 setStackPointerRegisterToSaveRestore(SP::O6);
568 if (TM.getSubtarget<SparcSubtarget>().isV9())
569 setOperationAction(ISD::CTPOP, MVT::i32, Legal);
571 computeRegisterProperties();
574 const char *SparcTargetLowering::getTargetNodeName(unsigned Opcode) const {
577 case SPISD::CMPICC: return "SPISD::CMPICC";
578 case SPISD::CMPFCC: return "SPISD::CMPFCC";
579 case SPISD::BRICC: return "SPISD::BRICC";
580 case SPISD::BRFCC: return "SPISD::BRFCC";
581 case SPISD::SELECT_ICC: return "SPISD::SELECT_ICC";
582 case SPISD::SELECT_FCC: return "SPISD::SELECT_FCC";
583 case SPISD::Hi: return "SPISD::Hi";
584 case SPISD::Lo: return "SPISD::Lo";
585 case SPISD::FTOI: return "SPISD::FTOI";
586 case SPISD::ITOF: return "SPISD::ITOF";
587 case SPISD::CALL: return "SPISD::CALL";
588 case SPISD::RET_FLAG: return "SPISD::RET_FLAG";
592 /// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to
593 /// be zero. Op is expected to be a target specific node. Used by DAG
595 void SparcTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op,
599 const SelectionDAG &DAG,
600 unsigned Depth) const {
601 APInt KnownZero2, KnownOne2;
602 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0); // Don't know anything.
604 switch (Op.getOpcode()) {
606 case SPISD::SELECT_ICC:
607 case SPISD::SELECT_FCC:
608 DAG.ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne,
610 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2,
612 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
613 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
615 // Only known if known in both the LHS and RHS.
616 KnownOne &= KnownOne2;
617 KnownZero &= KnownZero2;
622 // Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so
623 // set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition.
624 static void LookThroughSetCC(SDOperand &LHS, SDOperand &RHS,
625 ISD::CondCode CC, unsigned &SPCC) {
626 if (isa<ConstantSDNode>(RHS) && cast<ConstantSDNode>(RHS)->getValue() == 0 &&
628 ((LHS.getOpcode() == SPISD::SELECT_ICC &&
629 LHS.getOperand(3).getOpcode() == SPISD::CMPICC) ||
630 (LHS.getOpcode() == SPISD::SELECT_FCC &&
631 LHS.getOperand(3).getOpcode() == SPISD::CMPFCC)) &&
632 isa<ConstantSDNode>(LHS.getOperand(0)) &&
633 isa<ConstantSDNode>(LHS.getOperand(1)) &&
634 cast<ConstantSDNode>(LHS.getOperand(0))->getValue() == 1 &&
635 cast<ConstantSDNode>(LHS.getOperand(1))->getValue() == 0) {
636 SDOperand CMPCC = LHS.getOperand(3);
637 SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getValue();
638 LHS = CMPCC.getOperand(0);
639 RHS = CMPCC.getOperand(1);
643 static SDOperand LowerGLOBALADDRESS(SDOperand Op, SelectionDAG &DAG) {
644 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
645 SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32);
646 SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, GA);
647 SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, GA);
648 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
651 static SDOperand LowerCONSTANTPOOL(SDOperand Op, SelectionDAG &DAG) {
652 ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
653 Constant *C = N->getConstVal();
654 SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment());
655 SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, CP);
656 SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, CP);
657 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
660 static SDOperand LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
661 // Convert the fp value to integer in an FP register.
662 assert(Op.getValueType() == MVT::i32);
663 Op = DAG.getNode(SPISD::FTOI, MVT::f32, Op.getOperand(0));
664 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op);
667 static SDOperand LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
668 assert(Op.getOperand(0).getValueType() == MVT::i32);
669 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0));
670 // Convert the int value to FP in an FP register.
671 return DAG.getNode(SPISD::ITOF, Op.getValueType(), Tmp);
674 static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG) {
675 SDOperand Chain = Op.getOperand(0);
676 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
677 SDOperand LHS = Op.getOperand(2);
678 SDOperand RHS = Op.getOperand(3);
679 SDOperand Dest = Op.getOperand(4);
680 unsigned Opc, SPCC = ~0U;
682 // If this is a br_cc of a "setcc", and if the setcc got lowered into
683 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
684 LookThroughSetCC(LHS, RHS, CC, SPCC);
686 // Get the condition flag.
687 SDOperand CompareFlag;
688 if (LHS.getValueType() == MVT::i32) {
689 std::vector<MVT::ValueType> VTs;
690 VTs.push_back(MVT::i32);
691 VTs.push_back(MVT::Flag);
692 SDOperand Ops[2] = { LHS, RHS };
693 CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1);
694 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC);
697 CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS);
698 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC);
701 return DAG.getNode(Opc, MVT::Other, Chain, Dest,
702 DAG.getConstant(SPCC, MVT::i32), CompareFlag);
705 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG) {
706 SDOperand LHS = Op.getOperand(0);
707 SDOperand RHS = Op.getOperand(1);
708 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
709 SDOperand TrueVal = Op.getOperand(2);
710 SDOperand FalseVal = Op.getOperand(3);
711 unsigned Opc, SPCC = ~0U;
713 // If this is a select_cc of a "setcc", and if the setcc got lowered into
714 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values.
715 LookThroughSetCC(LHS, RHS, CC, SPCC);
717 SDOperand CompareFlag;
718 if (LHS.getValueType() == MVT::i32) {
719 std::vector<MVT::ValueType> VTs;
720 VTs.push_back(LHS.getValueType()); // subcc returns a value
721 VTs.push_back(MVT::Flag);
722 SDOperand Ops[2] = { LHS, RHS };
723 CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1);
724 Opc = SPISD::SELECT_ICC;
725 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC);
727 CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS);
728 Opc = SPISD::SELECT_FCC;
729 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC);
731 return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal,
732 DAG.getConstant(SPCC, MVT::i32), CompareFlag);
735 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
736 SparcTargetLowering &TLI) {
737 // vastart just stores the address of the VarArgsFrameIndex slot into the
738 // memory location argument.
739 SDOperand Offset = DAG.getNode(ISD::ADD, MVT::i32,
740 DAG.getRegister(SP::I6, MVT::i32),
741 DAG.getConstant(TLI.getVarArgsFrameOffset(),
743 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
744 return DAG.getStore(Op.getOperand(0), Offset, Op.getOperand(1), SV, 0);
747 static SDOperand LowerVAARG(SDOperand Op, SelectionDAG &DAG) {
748 SDNode *Node = Op.Val;
749 MVT::ValueType VT = Node->getValueType(0);
750 SDOperand InChain = Node->getOperand(0);
751 SDOperand VAListPtr = Node->getOperand(1);
752 const Value *SV = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
753 SDOperand VAList = DAG.getLoad(MVT::i32, InChain, VAListPtr, SV, 0);
754 // Increment the pointer, VAList, to the next vaarg
755 SDOperand NextPtr = DAG.getNode(ISD::ADD, MVT::i32, VAList,
756 DAG.getConstant(MVT::getSizeInBits(VT)/8,
758 // Store the incremented VAList to the legalized pointer
759 InChain = DAG.getStore(VAList.getValue(1), NextPtr,
761 // Load the actual argument out of the pointer VAList, unless this is an
764 return DAG.getLoad(VT, InChain, VAList, NULL, 0);
766 // Otherwise, load it as i64, then do a bitconvert.
767 SDOperand V = DAG.getLoad(MVT::i64, InChain, VAList, NULL, 0);
769 // Bit-Convert the value to f64.
771 DAG.getNode(ISD::BIT_CONVERT, MVT::f64, V),
774 return DAG.getNode(ISD::MERGE_VALUES, DAG.getVTList(MVT::f64, MVT::Other),
778 static SDOperand LowerDYNAMIC_STACKALLOC(SDOperand Op, SelectionDAG &DAG) {
779 SDOperand Chain = Op.getOperand(0); // Legalize the chain.
780 SDOperand Size = Op.getOperand(1); // Legalize the size.
782 unsigned SPReg = SP::O6;
783 SDOperand SP = DAG.getCopyFromReg(Chain, SPReg, MVT::i32);
784 SDOperand NewSP = DAG.getNode(ISD::SUB, MVT::i32, SP, Size); // Value
785 Chain = DAG.getCopyToReg(SP.getValue(1), SPReg, NewSP); // Output chain
787 // The resultant pointer is actually 16 words from the bottom of the stack,
788 // to provide a register spill area.
789 SDOperand NewVal = DAG.getNode(ISD::ADD, MVT::i32, NewSP,
790 DAG.getConstant(96, MVT::i32));
791 std::vector<MVT::ValueType> Tys;
792 Tys.push_back(MVT::i32);
793 Tys.push_back(MVT::Other);
794 SDOperand Ops[2] = { NewVal, Chain };
795 return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops, 2);
799 SDOperand SparcTargetLowering::
800 LowerOperation(SDOperand Op, SelectionDAG &DAG) {
801 switch (Op.getOpcode()) {
802 default: assert(0 && "Should not custom lower this!");
803 // Frame & Return address. Currently unimplemented
804 case ISD::RETURNADDR: return SDOperand();
805 case ISD::FRAMEADDR: return SDOperand();
806 case ISD::GlobalTLSAddress:
807 assert(0 && "TLS not implemented for Sparc.");
808 case ISD::GlobalAddress: return LowerGLOBALADDRESS(Op, DAG);
809 case ISD::ConstantPool: return LowerCONSTANTPOOL(Op, DAG);
810 case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
811 case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
812 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
813 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
814 case ISD::VASTART: return LowerVASTART(Op, DAG, *this);
815 case ISD::VAARG: return LowerVAARG(Op, DAG);
816 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
817 case ISD::CALL: return LowerCALL(Op, DAG);
818 case ISD::RET: return LowerRET(Op, DAG);
823 SparcTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
824 MachineBasicBlock *BB) {
825 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
828 // Figure out the conditional branch opcode to use for this select_cc.
829 switch (MI->getOpcode()) {
830 default: assert(0 && "Unknown SELECT_CC!");
831 case SP::SELECT_CC_Int_ICC:
832 case SP::SELECT_CC_FP_ICC:
833 case SP::SELECT_CC_DFP_ICC:
834 BROpcode = SP::BCOND;
836 case SP::SELECT_CC_Int_FCC:
837 case SP::SELECT_CC_FP_FCC:
838 case SP::SELECT_CC_DFP_FCC:
839 BROpcode = SP::FBCOND;
843 CC = (SPCC::CondCodes)MI->getOperand(3).getImm();
845 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
846 // control-flow pattern. The incoming instruction knows the destination vreg
847 // to set, the condition code register to branch on, the true/false values to
848 // select between, and a branch opcode to use.
849 const BasicBlock *LLVM_BB = BB->getBasicBlock();
850 ilist<MachineBasicBlock>::iterator It = BB;
857 // fallthrough --> copy0MBB
858 MachineBasicBlock *thisMBB = BB;
859 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
860 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
861 BuildMI(BB, TII.get(BROpcode)).addMBB(sinkMBB).addImm(CC);
862 MachineFunction *F = BB->getParent();
863 F->getBasicBlockList().insert(It, copy0MBB);
864 F->getBasicBlockList().insert(It, sinkMBB);
865 // Update machine-CFG edges by first adding all successors of the current
866 // block to the new block which will contain the Phi node for the select.
867 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
868 e = BB->succ_end(); i != e; ++i)
869 sinkMBB->addSuccessor(*i);
870 // Next, remove all successors of the current block, and add the true
871 // and fallthrough blocks as its successors.
872 while(!BB->succ_empty())
873 BB->removeSuccessor(BB->succ_begin());
874 BB->addSuccessor(copy0MBB);
875 BB->addSuccessor(sinkMBB);
879 // # fallthrough to sinkMBB
882 // Update machine-CFG edges
883 BB->addSuccessor(sinkMBB);
886 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
889 BuildMI(BB, TII.get(SP::PHI), MI->getOperand(0).getReg())
890 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
891 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
893 delete MI; // The pseudo instruction is gone now.