1 //===-- SystemZISelLowering.cpp - SystemZ 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 SystemZTargetLowering class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "systemz-lower"
16 #include "SystemZISelLowering.h"
18 #include "SystemZTargetMachine.h"
19 #include "SystemZSubtarget.h"
20 #include "llvm/DerivedTypes.h"
21 #include "llvm/Function.h"
22 #include "llvm/Intrinsics.h"
23 #include "llvm/CallingConv.h"
24 #include "llvm/GlobalVariable.h"
25 #include "llvm/GlobalAlias.h"
26 #include "llvm/CodeGen/CallingConvLower.h"
27 #include "llvm/CodeGen/MachineFrameInfo.h"
28 #include "llvm/CodeGen/MachineFunction.h"
29 #include "llvm/CodeGen/MachineInstrBuilder.h"
30 #include "llvm/CodeGen/MachineRegisterInfo.h"
31 #include "llvm/CodeGen/PseudoSourceValue.h"
32 #include "llvm/CodeGen/SelectionDAGISel.h"
33 #include "llvm/CodeGen/ValueTypes.h"
34 #include "llvm/Target/TargetOptions.h"
35 #include "llvm/Target/TargetLoweringObjectFile.h"
36 #include "llvm/Support/Debug.h"
37 #include "llvm/Support/ErrorHandling.h"
38 #include "llvm/Support/raw_ostream.h"
39 #include "llvm/ADT/VectorExtras.h"
42 SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm) :
43 TargetLowering(tm, new TargetLoweringObjectFileELF()),
44 Subtarget(*tm.getSubtargetImpl()), TM(tm) {
46 RegInfo = TM.getRegisterInfo();
48 // Set up the register classes.
49 addRegisterClass(MVT::i32, SystemZ::GR32RegisterClass);
50 addRegisterClass(MVT::i64, SystemZ::GR64RegisterClass);
51 addRegisterClass(MVT::v2i32,SystemZ::GR64PRegisterClass);
52 addRegisterClass(MVT::v2i64,SystemZ::GR128RegisterClass);
55 addRegisterClass(MVT::f32, SystemZ::FP32RegisterClass);
56 addRegisterClass(MVT::f64, SystemZ::FP64RegisterClass);
59 // Compute derived properties from the register classes
60 computeRegisterProperties();
62 // Set shifts properties
63 setShiftAmountType(MVT::i64);
65 // Provide all sorts of operation actions
66 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
67 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
68 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
70 setLoadExtAction(ISD::SEXTLOAD, MVT::f32, Expand);
71 setLoadExtAction(ISD::ZEXTLOAD, MVT::f32, Expand);
72 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
74 setLoadExtAction(ISD::SEXTLOAD, MVT::f64, Expand);
75 setLoadExtAction(ISD::ZEXTLOAD, MVT::f64, Expand);
76 setLoadExtAction(ISD::EXTLOAD, MVT::f64, Expand);
78 setStackPointerRegisterToSaveRestore(SystemZ::R15D);
80 // TODO: It may be better to default to latency-oriented scheduling, however
81 // LLVM's current latency-oriented scheduler can't handle physreg definitions
82 // such as SystemZ has with PSW, so set this to the register-pressure
83 // scheduler, because it can.
84 setSchedulingPreference(SchedulingForRegPressure);
86 setBooleanContents(ZeroOrOneBooleanContent);
88 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
89 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
90 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
91 setOperationAction(ISD::BR_CC, MVT::i64, Custom);
92 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
93 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
94 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
95 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
96 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
97 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
98 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
100 setOperationAction(ISD::SDIV, MVT::i32, Expand);
101 setOperationAction(ISD::UDIV, MVT::i32, Expand);
102 setOperationAction(ISD::SDIV, MVT::i64, Expand);
103 setOperationAction(ISD::UDIV, MVT::i64, Expand);
104 setOperationAction(ISD::SREM, MVT::i32, Expand);
105 setOperationAction(ISD::UREM, MVT::i32, Expand);
106 setOperationAction(ISD::SREM, MVT::i64, Expand);
107 setOperationAction(ISD::UREM, MVT::i64, Expand);
109 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
111 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
112 setOperationAction(ISD::CTPOP, MVT::i64, Expand);
113 setOperationAction(ISD::CTTZ, MVT::i32, Expand);
114 setOperationAction(ISD::CTTZ, MVT::i64, Expand);
115 setOperationAction(ISD::CTLZ, MVT::i32, Promote);
116 setOperationAction(ISD::CTLZ, MVT::i64, Legal);
118 // FIXME: Can we lower these 2 efficiently?
119 setOperationAction(ISD::SETCC, MVT::i32, Expand);
120 setOperationAction(ISD::SETCC, MVT::i64, Expand);
121 setOperationAction(ISD::SETCC, MVT::f32, Expand);
122 setOperationAction(ISD::SETCC, MVT::f64, Expand);
123 setOperationAction(ISD::SELECT, MVT::i32, Expand);
124 setOperationAction(ISD::SELECT, MVT::i64, Expand);
125 setOperationAction(ISD::SELECT, MVT::f32, Expand);
126 setOperationAction(ISD::SELECT, MVT::f64, Expand);
127 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
128 setOperationAction(ISD::SELECT_CC, MVT::i64, Custom);
129 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
130 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
132 setOperationAction(ISD::MULHS, MVT::i64, Expand);
133 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
135 // FIXME: Can we support these natively?
136 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
137 setOperationAction(ISD::SRL_PARTS, MVT::i64, Expand);
138 setOperationAction(ISD::SHL_PARTS, MVT::i64, Expand);
139 setOperationAction(ISD::SRA_PARTS, MVT::i64, Expand);
141 // Lower some FP stuff
142 setOperationAction(ISD::FSIN, MVT::f32, Expand);
143 setOperationAction(ISD::FSIN, MVT::f64, Expand);
144 setOperationAction(ISD::FCOS, MVT::f32, Expand);
145 setOperationAction(ISD::FCOS, MVT::f64, Expand);
146 setOperationAction(ISD::FREM, MVT::f32, Expand);
147 setOperationAction(ISD::FREM, MVT::f64, Expand);
149 // We have only 64-bit bitconverts
150 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand);
151 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand);
153 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
154 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
155 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
156 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
158 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
161 SDValue SystemZTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
162 switch (Op.getOpcode()) {
163 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
164 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
165 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
166 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
167 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
169 llvm_unreachable("Should not custom lower this!");
174 bool SystemZTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
175 if (UseSoftFloat || (VT != MVT::f32 && VT != MVT::f64))
182 return Imm.isZero() || Imm.isNegZero();
185 //===----------------------------------------------------------------------===//
186 // SystemZ Inline Assembly Support
187 //===----------------------------------------------------------------------===//
189 /// getConstraintType - Given a constraint letter, return the type of
190 /// constraint it is for this target.
191 TargetLowering::ConstraintType
192 SystemZTargetLowering::getConstraintType(const std::string &Constraint) const {
193 if (Constraint.size() == 1) {
194 switch (Constraint[0]) {
196 return C_RegisterClass;
201 return TargetLowering::getConstraintType(Constraint);
204 std::pair<unsigned, const TargetRegisterClass*>
205 SystemZTargetLowering::
206 getRegForInlineAsmConstraint(const std::string &Constraint,
208 if (Constraint.size() == 1) {
209 // GCC Constraint Letters
210 switch (Constraint[0]) {
212 case 'r': // GENERAL_REGS
214 return std::make_pair(0U, SystemZ::GR32RegisterClass);
215 else if (VT == MVT::i128)
216 return std::make_pair(0U, SystemZ::GR128RegisterClass);
218 return std::make_pair(0U, SystemZ::GR64RegisterClass);
222 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
225 //===----------------------------------------------------------------------===//
226 // Calling Convention Implementation
227 //===----------------------------------------------------------------------===//
229 #include "SystemZGenCallingConv.inc"
232 SystemZTargetLowering::LowerFormalArguments(SDValue Chain,
233 CallingConv::ID CallConv,
235 const SmallVectorImpl<ISD::InputArg>
239 SmallVectorImpl<SDValue> &InVals) {
243 llvm_unreachable("Unsupported calling convention");
245 case CallingConv::Fast:
246 return LowerCCCArguments(Chain, CallConv, isVarArg, Ins, dl, DAG, InVals);
251 SystemZTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
252 CallingConv::ID CallConv, bool isVarArg,
254 const SmallVectorImpl<ISD::OutputArg> &Outs,
255 const SmallVectorImpl<ISD::InputArg> &Ins,
256 DebugLoc dl, SelectionDAG &DAG,
257 SmallVectorImpl<SDValue> &InVals) {
258 // SystemZ target does not yet support tail call optimization.
263 llvm_unreachable("Unsupported calling convention");
264 case CallingConv::Fast:
266 return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall,
267 Outs, Ins, dl, DAG, InVals);
271 /// LowerCCCArguments - transform physical registers into virtual registers and
272 /// generate load operations for arguments places on the stack.
273 // FIXME: struct return stuff
276 SystemZTargetLowering::LowerCCCArguments(SDValue Chain,
277 CallingConv::ID CallConv,
279 const SmallVectorImpl<ISD::InputArg>
283 SmallVectorImpl<SDValue> &InVals) {
285 MachineFunction &MF = DAG.getMachineFunction();
286 MachineFrameInfo *MFI = MF.getFrameInfo();
287 MachineRegisterInfo &RegInfo = MF.getRegInfo();
289 // Assign locations to all of the incoming arguments.
290 SmallVector<CCValAssign, 16> ArgLocs;
291 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
292 ArgLocs, *DAG.getContext());
293 CCInfo.AnalyzeFormalArguments(Ins, CC_SystemZ);
296 llvm_report_error("Varargs not supported yet");
298 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
300 CCValAssign &VA = ArgLocs[i];
301 EVT LocVT = VA.getLocVT();
303 // Arguments passed in registers
304 TargetRegisterClass *RC;
305 switch (LocVT.getSimpleVT().SimpleTy) {
308 errs() << "LowerFormalArguments Unhandled argument type: "
309 << LocVT.getSimpleVT().SimpleTy
314 RC = SystemZ::GR64RegisterClass;
317 RC = SystemZ::FP32RegisterClass;
320 RC = SystemZ::FP64RegisterClass;
324 unsigned VReg = RegInfo.createVirtualRegister(RC);
325 RegInfo.addLiveIn(VA.getLocReg(), VReg);
326 ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, LocVT);
329 assert(VA.isMemLoc());
331 // Create the nodes corresponding to a load from this parameter slot.
332 // Create the frame index object for this incoming parameter...
333 int FI = MFI->CreateFixedObject(LocVT.getSizeInBits()/8,
334 VA.getLocMemOffset(), true, false);
336 // Create the SelectionDAG nodes corresponding to a load
337 // from this parameter
338 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
339 ArgValue = DAG.getLoad(LocVT, dl, Chain, FIN,
340 PseudoSourceValue::getFixedStack(FI), 0);
343 // If this is an 8/16/32-bit value, it is really passed promoted to 64
344 // bits. Insert an assert[sz]ext to capture this, then truncate to the
346 if (VA.getLocInfo() == CCValAssign::SExt)
347 ArgValue = DAG.getNode(ISD::AssertSext, dl, LocVT, ArgValue,
348 DAG.getValueType(VA.getValVT()));
349 else if (VA.getLocInfo() == CCValAssign::ZExt)
350 ArgValue = DAG.getNode(ISD::AssertZext, dl, LocVT, ArgValue,
351 DAG.getValueType(VA.getValVT()));
353 if (VA.getLocInfo() != CCValAssign::Full)
354 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
356 InVals.push_back(ArgValue);
362 /// LowerCCCCallTo - functions arguments are copied from virtual regs to
363 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
366 SystemZTargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee,
367 CallingConv::ID CallConv, bool isVarArg,
369 const SmallVectorImpl<ISD::OutputArg>
371 const SmallVectorImpl<ISD::InputArg> &Ins,
372 DebugLoc dl, SelectionDAG &DAG,
373 SmallVectorImpl<SDValue> &InVals) {
375 MachineFunction &MF = DAG.getMachineFunction();
377 // Offset to first argument stack slot.
378 const unsigned FirstArgOffset = 160;
380 // Analyze operands of the call, assigning locations to each operand.
381 SmallVector<CCValAssign, 16> ArgLocs;
382 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
383 ArgLocs, *DAG.getContext());
385 CCInfo.AnalyzeCallOperands(Outs, CC_SystemZ);
387 // Get a count of how many bytes are to be pushed on the stack.
388 unsigned NumBytes = CCInfo.getNextStackOffset();
390 Chain = DAG.getCALLSEQ_START(Chain ,DAG.getConstant(NumBytes,
391 getPointerTy(), true));
393 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
394 SmallVector<SDValue, 12> MemOpChains;
397 // Walk the register/memloc assignments, inserting copies/loads.
398 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
399 CCValAssign &VA = ArgLocs[i];
401 SDValue Arg = Outs[i].Val;
403 // Promote the value if needed.
404 switch (VA.getLocInfo()) {
405 default: assert(0 && "Unknown loc info!");
406 case CCValAssign::Full: break;
407 case CCValAssign::SExt:
408 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
410 case CCValAssign::ZExt:
411 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
413 case CCValAssign::AExt:
414 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
418 // Arguments that can be passed on register must be kept at RegsToPass
421 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
423 assert(VA.isMemLoc());
425 if (StackPtr.getNode() == 0)
427 DAG.getCopyFromReg(Chain, dl,
428 (RegInfo->hasFP(MF) ?
429 SystemZ::R11D : SystemZ::R15D),
432 unsigned Offset = FirstArgOffset + VA.getLocMemOffset();
433 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
435 DAG.getIntPtrConstant(Offset));
437 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
438 PseudoSourceValue::getStack(), Offset));
442 // Transform all store nodes into one single node because all store nodes are
443 // independent of each other.
444 if (!MemOpChains.empty())
445 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
446 &MemOpChains[0], MemOpChains.size());
448 // Build a sequence of copy-to-reg nodes chained together with token chain and
449 // flag operands which copy the outgoing args into registers. The InFlag in
450 // necessary since all emited instructions must be stuck together.
452 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
453 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
454 RegsToPass[i].second, InFlag);
455 InFlag = Chain.getValue(1);
458 // If the callee is a GlobalAddress node (quite common, every direct call is)
459 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
460 // Likewise ExternalSymbol -> TargetExternalSymbol.
461 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
462 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy());
463 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
464 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), getPointerTy());
466 // Returns a chain & a flag for retval copy to use.
467 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
468 SmallVector<SDValue, 8> Ops;
469 Ops.push_back(Chain);
470 Ops.push_back(Callee);
472 // Add argument registers to the end of the list so that they are
473 // known live into the call.
474 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
475 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
476 RegsToPass[i].second.getValueType()));
478 if (InFlag.getNode())
479 Ops.push_back(InFlag);
481 Chain = DAG.getNode(SystemZISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
482 InFlag = Chain.getValue(1);
484 // Create the CALLSEQ_END node.
485 Chain = DAG.getCALLSEQ_END(Chain,
486 DAG.getConstant(NumBytes, getPointerTy(), true),
487 DAG.getConstant(0, getPointerTy(), true),
489 InFlag = Chain.getValue(1);
491 // Handle result values, copying them out of physregs into vregs that we
493 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl,
497 /// LowerCallResult - Lower the result values of a call into the
498 /// appropriate copies out of appropriate physical registers.
501 SystemZTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
502 CallingConv::ID CallConv, bool isVarArg,
503 const SmallVectorImpl<ISD::InputArg>
505 DebugLoc dl, SelectionDAG &DAG,
506 SmallVectorImpl<SDValue> &InVals) {
508 // Assign locations to each value returned by this call.
509 SmallVector<CCValAssign, 16> RVLocs;
510 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs,
513 CCInfo.AnalyzeCallResult(Ins, RetCC_SystemZ);
515 // Copy all of the result registers out of their specified physreg.
516 for (unsigned i = 0; i != RVLocs.size(); ++i) {
517 CCValAssign &VA = RVLocs[i];
519 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
520 VA.getLocVT(), InFlag).getValue(1);
521 SDValue RetValue = Chain.getValue(0);
522 InFlag = Chain.getValue(2);
524 // If this is an 8/16/32-bit value, it is really passed promoted to 64
525 // bits. Insert an assert[sz]ext to capture this, then truncate to the
527 if (VA.getLocInfo() == CCValAssign::SExt)
528 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
529 DAG.getValueType(VA.getValVT()));
530 else if (VA.getLocInfo() == CCValAssign::ZExt)
531 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
532 DAG.getValueType(VA.getValVT()));
534 if (VA.getLocInfo() != CCValAssign::Full)
535 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
537 InVals.push_back(RetValue);
545 SystemZTargetLowering::LowerReturn(SDValue Chain,
546 CallingConv::ID CallConv, bool isVarArg,
547 const SmallVectorImpl<ISD::OutputArg> &Outs,
548 DebugLoc dl, SelectionDAG &DAG) {
550 // CCValAssign - represent the assignment of the return value to a location
551 SmallVector<CCValAssign, 16> RVLocs;
553 // CCState - Info about the registers and stack slot.
554 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
555 RVLocs, *DAG.getContext());
557 // Analize return values.
558 CCInfo.AnalyzeReturn(Outs, RetCC_SystemZ);
560 // If this is the first return lowered for this function, add the regs to the
561 // liveout set for the function.
562 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
563 for (unsigned i = 0; i != RVLocs.size(); ++i)
564 if (RVLocs[i].isRegLoc())
565 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
570 // Copy the result values into the output registers.
571 for (unsigned i = 0; i != RVLocs.size(); ++i) {
572 CCValAssign &VA = RVLocs[i];
573 SDValue ResValue = Outs[i].Val;
574 assert(VA.isRegLoc() && "Can only return in registers!");
576 // If this is an 8/16/32-bit value, it is really should be passed promoted
578 if (VA.getLocInfo() == CCValAssign::SExt)
579 ResValue = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ResValue);
580 else if (VA.getLocInfo() == CCValAssign::ZExt)
581 ResValue = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), ResValue);
582 else if (VA.getLocInfo() == CCValAssign::AExt)
583 ResValue = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), ResValue);
585 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), ResValue, Flag);
587 // Guarantee that all emitted copies are stuck together,
588 // avoiding something bad.
589 Flag = Chain.getValue(1);
593 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
596 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain);
599 SDValue SystemZTargetLowering::EmitCmp(SDValue LHS, SDValue RHS,
600 ISD::CondCode CC, SDValue &SystemZCC,
602 // FIXME: Emit a test if RHS is zero
604 bool isUnsigned = false;
605 SystemZCC::CondCodes TCC;
608 llvm_unreachable("Invalid integer condition!");
614 TCC = SystemZCC::NLH;
630 if (LHS.getValueType().isFloatingPoint()) {
634 isUnsigned = true; // FALLTHROUGH
640 if (LHS.getValueType().isFloatingPoint()) {
644 isUnsigned = true; // FALLTHROUGH
650 if (LHS.getValueType().isFloatingPoint()) {
651 TCC = SystemZCC::NLE;
654 isUnsigned = true; // FALLTHROUGH
660 if (LHS.getValueType().isFloatingPoint()) {
661 TCC = SystemZCC::NHE;
664 isUnsigned = true; // FALLTHROUGH
671 SystemZCC = DAG.getConstant(TCC, MVT::i32);
673 DebugLoc dl = LHS.getDebugLoc();
674 return DAG.getNode((isUnsigned ? SystemZISD::UCMP : SystemZISD::CMP),
675 dl, MVT::i64, LHS, RHS);
679 SDValue SystemZTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
680 SDValue Chain = Op.getOperand(0);
681 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
682 SDValue LHS = Op.getOperand(2);
683 SDValue RHS = Op.getOperand(3);
684 SDValue Dest = Op.getOperand(4);
685 DebugLoc dl = Op.getDebugLoc();
688 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
689 return DAG.getNode(SystemZISD::BRCOND, dl, Op.getValueType(),
690 Chain, Dest, SystemZCC, Flag);
693 SDValue SystemZTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
694 SDValue LHS = Op.getOperand(0);
695 SDValue RHS = Op.getOperand(1);
696 SDValue TrueV = Op.getOperand(2);
697 SDValue FalseV = Op.getOperand(3);
698 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
699 DebugLoc dl = Op.getDebugLoc();
702 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
704 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Flag);
705 SmallVector<SDValue, 4> Ops;
706 Ops.push_back(TrueV);
707 Ops.push_back(FalseV);
708 Ops.push_back(SystemZCC);
711 return DAG.getNode(SystemZISD::SELECT, dl, VTs, &Ops[0], Ops.size());
714 SDValue SystemZTargetLowering::LowerGlobalAddress(SDValue Op,
716 DebugLoc dl = Op.getDebugLoc();
717 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
718 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
720 bool IsPic = getTargetMachine().getRelocationModel() == Reloc::PIC_;
721 bool ExtraLoadRequired =
722 Subtarget.GVRequiresExtraLoad(GV, getTargetMachine(), false);
725 if (!IsPic && !ExtraLoadRequired) {
726 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), Offset);
729 unsigned char OpFlags = 0;
730 if (ExtraLoadRequired)
731 OpFlags = SystemZII::MO_GOTENT;
733 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), 0, OpFlags);
736 Result = DAG.getNode(SystemZISD::PCRelativeWrapper, dl,
737 getPointerTy(), Result);
739 if (ExtraLoadRequired)
740 Result = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), Result,
741 PseudoSourceValue::getGOT(), 0);
743 // If there was a non-zero offset that we didn't fold, create an explicit
746 Result = DAG.getNode(ISD::ADD, dl, getPointerTy(), Result,
747 DAG.getConstant(Offset, getPointerTy()));
753 SDValue SystemZTargetLowering::LowerJumpTable(SDValue Op,
755 DebugLoc dl = Op.getDebugLoc();
756 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
757 SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy());
759 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
764 // FIXME: This is just dirty hack. We need to lower cpool properly
765 SDValue SystemZTargetLowering::LowerConstantPool(SDValue Op,
767 DebugLoc dl = Op.getDebugLoc();
768 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
770 SDValue Result = DAG.getTargetConstantPool(CP->getConstVal(), getPointerTy(),
774 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
777 const char *SystemZTargetLowering::getTargetNodeName(unsigned Opcode) const {
779 case SystemZISD::RET_FLAG: return "SystemZISD::RET_FLAG";
780 case SystemZISD::CALL: return "SystemZISD::CALL";
781 case SystemZISD::BRCOND: return "SystemZISD::BRCOND";
782 case SystemZISD::CMP: return "SystemZISD::CMP";
783 case SystemZISD::UCMP: return "SystemZISD::UCMP";
784 case SystemZISD::SELECT: return "SystemZISD::SELECT";
785 case SystemZISD::PCRelativeWrapper: return "SystemZISD::PCRelativeWrapper";
786 default: return NULL;
790 //===----------------------------------------------------------------------===//
791 // Other Lowering Code
792 //===----------------------------------------------------------------------===//
795 SystemZTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
796 MachineBasicBlock *BB,
797 DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
798 const SystemZInstrInfo &TII = *TM.getInstrInfo();
799 DebugLoc dl = MI->getDebugLoc();
800 assert((MI->getOpcode() == SystemZ::Select32 ||
801 MI->getOpcode() == SystemZ::SelectF32 ||
802 MI->getOpcode() == SystemZ::Select64 ||
803 MI->getOpcode() == SystemZ::SelectF64) &&
804 "Unexpected instr type to insert");
806 // To "insert" a SELECT instruction, we actually have to insert the diamond
807 // control-flow pattern. The incoming instruction knows the destination vreg
808 // to set, the condition code register to branch on, the true/false values to
809 // select between, and a branch opcode to use.
810 const BasicBlock *LLVM_BB = BB->getBasicBlock();
811 MachineFunction::iterator I = BB;
819 // fallthrough --> copy0MBB
820 MachineBasicBlock *thisMBB = BB;
821 MachineFunction *F = BB->getParent();
822 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
823 MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB);
824 SystemZCC::CondCodes CC = (SystemZCC::CondCodes)MI->getOperand(3).getImm();
825 BuildMI(BB, dl, TII.getBrCond(CC)).addMBB(copy1MBB);
826 F->insert(I, copy0MBB);
827 F->insert(I, copy1MBB);
828 // Inform sdisel of the edge changes.
829 for (MachineBasicBlock::succ_iterator SI = BB->succ_begin(),
830 SE = BB->succ_end(); SI != SE; ++SI)
831 EM->insert(std::make_pair(*SI, copy1MBB));
832 // Update machine-CFG edges by transferring all successors of the current
833 // block to the new block which will contain the Phi node for the select.
834 copy1MBB->transferSuccessors(BB);
835 // Next, add the true and fallthrough blocks as its successors.
836 BB->addSuccessor(copy0MBB);
837 BB->addSuccessor(copy1MBB);
841 // # fallthrough to copy1MBB
844 // Update machine-CFG edges
845 BB->addSuccessor(copy1MBB);
848 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
851 BuildMI(BB, dl, TII.get(SystemZ::PHI),
852 MI->getOperand(0).getReg())
853 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
854 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
856 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.