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/Support/Debug.h"
35 #include "llvm/Target/TargetOptions.h"
36 #include "llvm/ADT/VectorExtras.h"
39 SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm) :
40 TargetLowering(tm), Subtarget(*tm.getSubtargetImpl()), TM(tm) {
42 RegInfo = TM.getRegisterInfo();
44 // Set up the register classes.
45 addRegisterClass(MVT::i32, SystemZ::GR32RegisterClass);
46 addRegisterClass(MVT::i64, SystemZ::GR64RegisterClass);
47 addRegisterClass(MVT::v2i32,SystemZ::GR64PRegisterClass);
48 addRegisterClass(MVT::i128, SystemZ::GR128RegisterClass);
49 addRegisterClass(MVT::v2i64,SystemZ::GR128RegisterClass);
52 addRegisterClass(MVT::f32, SystemZ::FP32RegisterClass);
53 addRegisterClass(MVT::f64, SystemZ::FP64RegisterClass);
55 addLegalFPImmediate(APFloat(+0.0)); // lzer
56 addLegalFPImmediate(APFloat(+0.0f)); // lzdr
57 addLegalFPImmediate(APFloat(-0.0)); // lzer + lner
58 addLegalFPImmediate(APFloat(-0.0f)); // lzdr + lndr
61 // Compute derived properties from the register classes
62 computeRegisterProperties();
64 // Set shifts properties
65 setShiftAmountFlavor(Extend);
66 setShiftAmountType(MVT::i64);
68 // Provide all sorts of operation actions
69 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
70 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
71 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
73 setLoadExtAction(ISD::SEXTLOAD, MVT::f32, Expand);
74 setLoadExtAction(ISD::ZEXTLOAD, MVT::f32, Expand);
75 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
77 setLoadExtAction(ISD::SEXTLOAD, MVT::f64, Expand);
78 setLoadExtAction(ISD::ZEXTLOAD, MVT::f64, Expand);
79 setLoadExtAction(ISD::EXTLOAD, MVT::f64, Expand);
81 setStackPointerRegisterToSaveRestore(SystemZ::R15D);
82 setSchedulingPreference(SchedulingForLatency);
84 setOperationAction(ISD::RET, MVT::Other, Custom);
86 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
87 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
88 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
89 setOperationAction(ISD::BR_CC, MVT::i64, Custom);
90 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
91 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
92 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
93 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
94 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
95 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
96 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
98 setOperationAction(ISD::SDIV, MVT::i32, Expand);
99 setOperationAction(ISD::UDIV, MVT::i32, Expand);
100 setOperationAction(ISD::SDIV, MVT::i64, Expand);
101 setOperationAction(ISD::UDIV, MVT::i64, Expand);
102 setOperationAction(ISD::SREM, MVT::i32, Expand);
103 setOperationAction(ISD::UREM, MVT::i32, Expand);
104 setOperationAction(ISD::SREM, MVT::i64, Expand);
105 setOperationAction(ISD::UREM, MVT::i64, Expand);
107 // FIXME: Can we lower these 2 efficiently?
108 setOperationAction(ISD::SETCC, MVT::i32, Expand);
109 setOperationAction(ISD::SETCC, MVT::i64, Expand);
110 setOperationAction(ISD::SETCC, MVT::f32, Expand);
111 setOperationAction(ISD::SETCC, MVT::f64, Expand);
112 setOperationAction(ISD::SELECT, MVT::i32, Expand);
113 setOperationAction(ISD::SELECT, MVT::i64, Expand);
114 setOperationAction(ISD::SELECT, MVT::f32, Expand);
115 setOperationAction(ISD::SELECT, MVT::f64, Expand);
116 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
117 setOperationAction(ISD::SELECT_CC, MVT::i64, Custom);
118 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
119 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
121 // Funny enough: we don't have 64-bit signed versions of these stuff, but have
123 setOperationAction(ISD::MULHS, MVT::i64, Expand);
124 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
126 // Lower some FP stuff
127 setOperationAction(ISD::FSIN, MVT::f32, Expand);
128 setOperationAction(ISD::FSIN, MVT::f64, Expand);
129 setOperationAction(ISD::FCOS, MVT::f32, Expand);
130 setOperationAction(ISD::FCOS, MVT::f64, Expand);
131 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
132 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
134 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
137 SDValue SystemZTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
138 switch (Op.getOpcode()) {
139 case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG);
140 case ISD::RET: return LowerRET(Op, DAG);
141 case ISD::CALL: return LowerCALL(Op, DAG);
142 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
143 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
144 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
145 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
146 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
148 assert(0 && "unimplemented operand");
153 //===----------------------------------------------------------------------===//
154 // Calling Convention Implementation
155 //===----------------------------------------------------------------------===//
157 #include "SystemZGenCallingConv.inc"
159 SDValue SystemZTargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op,
161 unsigned CC = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
164 assert(0 && "Unsupported calling convention");
166 case CallingConv::Fast:
167 return LowerCCCArguments(Op, DAG);
171 SDValue SystemZTargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
172 CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
173 unsigned CallingConv = TheCall->getCallingConv();
174 switch (CallingConv) {
176 assert(0 && "Unsupported calling convention");
177 case CallingConv::Fast:
179 return LowerCCCCallTo(Op, DAG, CallingConv);
183 /// LowerCCCArguments - transform physical registers into virtual registers and
184 /// generate load operations for arguments places on the stack.
185 // FIXME: struct return stuff
187 SDValue SystemZTargetLowering::LowerCCCArguments(SDValue Op,
189 MachineFunction &MF = DAG.getMachineFunction();
190 MachineFrameInfo *MFI = MF.getFrameInfo();
191 MachineRegisterInfo &RegInfo = MF.getRegInfo();
192 SDValue Root = Op.getOperand(0);
193 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
194 unsigned CC = MF.getFunction()->getCallingConv();
195 DebugLoc dl = Op.getDebugLoc();
197 // Assign locations to all of the incoming arguments.
198 SmallVector<CCValAssign, 16> ArgLocs;
199 CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
200 CCInfo.AnalyzeFormalArguments(Op.getNode(), CC_SystemZ);
202 assert(!isVarArg && "Varargs not supported yet");
204 SmallVector<SDValue, 16> ArgValues;
205 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
206 CCValAssign &VA = ArgLocs[i];
208 // Arguments passed in registers
209 MVT RegVT = VA.getLocVT();
210 TargetRegisterClass *RC;
211 switch (RegVT.getSimpleVT()) {
213 cerr << "LowerFORMAL_ARGUMENTS Unhandled argument type: "
214 << RegVT.getSimpleVT()
218 RC = SystemZ::GR64RegisterClass;
221 RC = SystemZ::FP32RegisterClass;
224 RC = SystemZ::FP64RegisterClass;
228 unsigned VReg = RegInfo.createVirtualRegister(RC);
229 RegInfo.addLiveIn(VA.getLocReg(), VReg);
230 SDValue ArgValue = DAG.getCopyFromReg(Root, dl, VReg, RegVT);
232 // If this is an 8/16/32-bit value, it is really passed promoted to 64
233 // bits. Insert an assert[sz]ext to capture this, then truncate to the
235 if (VA.getLocInfo() == CCValAssign::SExt)
236 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
237 DAG.getValueType(VA.getValVT()));
238 else if (VA.getLocInfo() == CCValAssign::ZExt)
239 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
240 DAG.getValueType(VA.getValVT()));
242 if (VA.getLocInfo() != CCValAssign::Full)
243 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
245 ArgValues.push_back(ArgValue);
248 assert(VA.isMemLoc());
250 // Create the nodes corresponding to a load from this parameter slot.
251 // Create the frame index object for this incoming parameter...
252 int FI = MFI->CreateFixedObject(VA.getValVT().getSizeInBits()/8,
253 VA.getLocMemOffset());
255 // Create the SelectionDAG nodes corresponding to a load
256 //from this parameter
257 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
258 ArgValues.push_back(DAG.getLoad(VA.getValVT(), dl, Root, FIN,
259 PseudoSourceValue::getFixedStack(FI), 0));
263 ArgValues.push_back(Root);
265 // Return the new list of results.
266 return DAG.getNode(ISD::MERGE_VALUES, dl, Op.getNode()->getVTList(),
267 &ArgValues[0], ArgValues.size()).getValue(Op.getResNo());
270 /// LowerCCCCallTo - functions arguments are copied from virtual regs to
271 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
273 SDValue SystemZTargetLowering::LowerCCCCallTo(SDValue Op, SelectionDAG &DAG,
275 CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
276 SDValue Chain = TheCall->getChain();
277 SDValue Callee = TheCall->getCallee();
278 bool isVarArg = TheCall->isVarArg();
279 DebugLoc dl = Op.getDebugLoc();
280 MachineFunction &MF = DAG.getMachineFunction();
282 // Offset to first argument stack slot.
283 const unsigned FirstArgOffset = 160;
285 // Analyze operands of the call, assigning locations to each operand.
286 SmallVector<CCValAssign, 16> ArgLocs;
287 CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
289 CCInfo.AnalyzeCallOperands(TheCall, CC_SystemZ);
291 // Get a count of how many bytes are to be pushed on the stack.
292 unsigned NumBytes = CCInfo.getNextStackOffset();
294 Chain = DAG.getCALLSEQ_START(Chain ,DAG.getConstant(NumBytes,
295 getPointerTy(), true));
297 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
298 SmallVector<SDValue, 12> MemOpChains;
301 // Walk the register/memloc assignments, inserting copies/loads.
302 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
303 CCValAssign &VA = ArgLocs[i];
305 // Arguments start after the 5 first operands of ISD::CALL
306 SDValue Arg = TheCall->getArg(i);
308 // Promote the value if needed.
309 switch (VA.getLocInfo()) {
310 default: assert(0 && "Unknown loc info!");
311 case CCValAssign::Full: break;
312 case CCValAssign::SExt:
313 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
315 case CCValAssign::ZExt:
316 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
318 case CCValAssign::AExt:
319 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
323 // Arguments that can be passed on register must be kept at RegsToPass
326 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
328 assert(VA.isMemLoc());
330 if (StackPtr.getNode() == 0)
332 DAG.getCopyFromReg(Chain, dl,
333 (RegInfo->hasFP(MF) ?
334 SystemZ::R11D : SystemZ::R15D),
337 unsigned Offset = FirstArgOffset + VA.getLocMemOffset();
338 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
340 DAG.getIntPtrConstant(Offset));
342 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
343 PseudoSourceValue::getStack(), Offset));
347 // Transform all store nodes into one single node because all store nodes are
348 // independent of each other.
349 if (!MemOpChains.empty())
350 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
351 &MemOpChains[0], MemOpChains.size());
353 // Build a sequence of copy-to-reg nodes chained together with token chain and
354 // flag operands which copy the outgoing args into registers. The InFlag in
355 // necessary since all emited instructions must be stuck together.
357 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
358 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
359 RegsToPass[i].second, InFlag);
360 InFlag = Chain.getValue(1);
363 // If the callee is a GlobalAddress node (quite common, every direct call is)
364 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
365 // Likewise ExternalSymbol -> TargetExternalSymbol.
366 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
367 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy());
368 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
369 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), getPointerTy());
371 // Returns a chain & a flag for retval copy to use.
372 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
373 SmallVector<SDValue, 8> Ops;
374 Ops.push_back(Chain);
375 Ops.push_back(Callee);
377 // Add argument registers to the end of the list so that they are
378 // known live into the call.
379 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
380 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
381 RegsToPass[i].second.getValueType()));
383 if (InFlag.getNode())
384 Ops.push_back(InFlag);
386 Chain = DAG.getNode(SystemZISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
387 InFlag = Chain.getValue(1);
389 // Create the CALLSEQ_END node.
390 Chain = DAG.getCALLSEQ_END(Chain,
391 DAG.getConstant(NumBytes, getPointerTy(), true),
392 DAG.getConstant(0, getPointerTy(), true),
394 InFlag = Chain.getValue(1);
396 // Handle result values, copying them out of physregs into vregs that we
398 return SDValue(LowerCallResult(Chain, InFlag, TheCall, CC, DAG),
402 /// LowerCallResult - Lower the result values of an ISD::CALL into the
403 /// appropriate copies out of appropriate physical registers. This assumes that
404 /// Chain/InFlag are the input chain/flag to use, and that TheCall is the call
405 /// being lowered. Returns a SDNode with the same number of values as the
408 SystemZTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
410 unsigned CallingConv,
412 bool isVarArg = TheCall->isVarArg();
413 DebugLoc dl = TheCall->getDebugLoc();
415 // Assign locations to each value returned by this call.
416 SmallVector<CCValAssign, 16> RVLocs;
417 CCState CCInfo(CallingConv, isVarArg, getTargetMachine(), RVLocs);
419 CCInfo.AnalyzeCallResult(TheCall, RetCC_SystemZ);
420 SmallVector<SDValue, 8> ResultVals;
422 // Copy all of the result registers out of their specified physreg.
423 for (unsigned i = 0; i != RVLocs.size(); ++i) {
424 CCValAssign &VA = RVLocs[i];
426 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
427 VA.getLocVT(), InFlag).getValue(1);
428 SDValue RetValue = Chain.getValue(0);
429 InFlag = Chain.getValue(2);
431 // If this is an 8/16/32-bit value, it is really passed promoted to 64
432 // bits. Insert an assert[sz]ext to capture this, then truncate to the
434 if (VA.getLocInfo() == CCValAssign::SExt)
435 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
436 DAG.getValueType(VA.getValVT()));
437 else if (VA.getLocInfo() == CCValAssign::ZExt)
438 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
439 DAG.getValueType(VA.getValVT()));
441 if (VA.getLocInfo() != CCValAssign::Full)
442 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
444 ResultVals.push_back(RetValue);
447 ResultVals.push_back(Chain);
449 // Merge everything together with a MERGE_VALUES node.
450 return DAG.getNode(ISD::MERGE_VALUES, dl, TheCall->getVTList(),
451 &ResultVals[0], ResultVals.size()).getNode();
455 SDValue SystemZTargetLowering::LowerRET(SDValue Op, SelectionDAG &DAG) {
456 // CCValAssign - represent the assignment of the return value to a location
457 SmallVector<CCValAssign, 16> RVLocs;
458 unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
459 bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
460 DebugLoc dl = Op.getDebugLoc();
462 // CCState - Info about the registers and stack slot.
463 CCState CCInfo(CC, isVarArg, getTargetMachine(), RVLocs);
465 // Analize return values of ISD::RET
466 CCInfo.AnalyzeReturn(Op.getNode(), RetCC_SystemZ);
468 // If this is the first return lowered for this function, add the regs to the
469 // liveout set for the function.
470 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
471 for (unsigned i = 0; i != RVLocs.size(); ++i)
472 if (RVLocs[i].isRegLoc())
473 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
476 // The chain is always operand #0
477 SDValue Chain = Op.getOperand(0);
480 // Copy the result values into the output registers.
481 for (unsigned i = 0; i != RVLocs.size(); ++i) {
482 CCValAssign &VA = RVLocs[i];
483 SDValue ResValue = Op.getOperand(i*2+1);
484 assert(VA.isRegLoc() && "Can only return in registers!");
486 // If this is an 8/16/32-bit value, it is really should be passed promoted
488 if (VA.getLocInfo() == CCValAssign::SExt)
489 ResValue = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ResValue);
490 else if (VA.getLocInfo() == CCValAssign::ZExt)
491 ResValue = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), ResValue);
492 else if (VA.getLocInfo() == CCValAssign::AExt)
493 ResValue = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), ResValue);
495 // ISD::RET => ret chain, (regnum1,val1), ...
496 // So i*2+1 index only the regnums
497 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), ResValue, Flag);
499 // Guarantee that all emitted copies are stuck together,
500 // avoiding something bad.
501 Flag = Chain.getValue(1);
505 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
508 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain);
511 SDValue SystemZTargetLowering::EmitCmp(SDValue LHS, SDValue RHS,
512 ISD::CondCode CC, SDValue &SystemZCC,
514 // FIXME: Emit a test if RHS is zero
516 bool isUnsigned = false;
517 SystemZCC::CondCodes TCC;
519 default: assert(0 && "Invalid integer condition!");
525 TCC = SystemZCC::NLH;
541 if (LHS.getValueType().isFloatingPoint()) {
545 isUnsigned = true; // FALLTHROUGH
551 if (LHS.getValueType().isFloatingPoint()) {
555 isUnsigned = true; // FALLTHROUGH
561 if (LHS.getValueType().isFloatingPoint()) {
562 TCC = SystemZCC::NLE;
565 isUnsigned = true; // FALLTHROUGH
571 if (LHS.getValueType().isFloatingPoint()) {
572 TCC = SystemZCC::NHE;
575 isUnsigned = true; // FALLTHROUGH
582 SystemZCC = DAG.getConstant(TCC, MVT::i32);
584 DebugLoc dl = LHS.getDebugLoc();
585 return DAG.getNode((isUnsigned ? SystemZISD::UCMP : SystemZISD::CMP),
586 dl, MVT::Flag, LHS, RHS);
590 SDValue SystemZTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
591 SDValue Chain = Op.getOperand(0);
592 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
593 SDValue LHS = Op.getOperand(2);
594 SDValue RHS = Op.getOperand(3);
595 SDValue Dest = Op.getOperand(4);
596 DebugLoc dl = Op.getDebugLoc();
599 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
600 return DAG.getNode(SystemZISD::BRCOND, dl, Op.getValueType(),
601 Chain, Dest, SystemZCC, Flag);
604 SDValue SystemZTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
605 SDValue LHS = Op.getOperand(0);
606 SDValue RHS = Op.getOperand(1);
607 SDValue TrueV = Op.getOperand(2);
608 SDValue FalseV = Op.getOperand(3);
609 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
610 DebugLoc dl = Op.getDebugLoc();
613 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
615 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Flag);
616 SmallVector<SDValue, 4> Ops;
617 Ops.push_back(TrueV);
618 Ops.push_back(FalseV);
619 Ops.push_back(SystemZCC);
622 return DAG.getNode(SystemZISD::SELECT, dl, VTs, &Ops[0], Ops.size());
625 SDValue SystemZTargetLowering::LowerGlobalAddress(SDValue Op,
627 DebugLoc dl = Op.getDebugLoc();
628 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
629 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
631 bool IsPic = getTargetMachine().getRelocationModel() == Reloc::PIC_;
632 bool ExtraLoadRequired =
633 Subtarget.GVRequiresExtraLoad(GV, getTargetMachine(), false);
636 if (!IsPic && !ExtraLoadRequired) {
637 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), Offset);
640 unsigned char OpFlags = 0;
641 if (ExtraLoadRequired)
642 OpFlags = SystemZII::MO_GOTENT;
644 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), 0, OpFlags);
647 Result = DAG.getNode(SystemZISD::PCRelativeWrapper, dl,
648 getPointerTy(), Result);
650 if (ExtraLoadRequired)
651 Result = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), Result,
652 PseudoSourceValue::getGOT(), 0);
654 // If there was a non-zero offset that we didn't fold, create an explicit
657 Result = DAG.getNode(ISD::ADD, dl, getPointerTy(), Result,
658 DAG.getConstant(Offset, getPointerTy()));
664 SDValue SystemZTargetLowering::LowerJumpTable(SDValue Op,
666 DebugLoc dl = Op.getDebugLoc();
667 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
668 SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy());
670 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
675 // FIXME: This is just dirty hack. We need to lower cpool properly
676 SDValue SystemZTargetLowering::LowerConstantPool(SDValue Op,
678 DebugLoc dl = Op.getDebugLoc();
679 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
681 SDValue Result = DAG.getTargetConstantPool(CP->getConstVal(), getPointerTy(),
685 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
688 const char *SystemZTargetLowering::getTargetNodeName(unsigned Opcode) const {
690 case SystemZISD::RET_FLAG: return "SystemZISD::RET_FLAG";
691 case SystemZISD::CALL: return "SystemZISD::CALL";
692 case SystemZISD::BRCOND: return "SystemZISD::BRCOND";
693 case SystemZISD::CMP: return "SystemZISD::CMP";
694 case SystemZISD::UCMP: return "SystemZISD::UCMP";
695 case SystemZISD::SELECT: return "SystemZISD::SELECT";
696 case SystemZISD::PCRelativeWrapper: return "SystemZISD::PCRelativeWrapper";
697 default: return NULL;
701 //===----------------------------------------------------------------------===//
702 // Other Lowering Code
703 //===----------------------------------------------------------------------===//
706 SystemZTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
707 MachineBasicBlock *BB) const {
708 const SystemZInstrInfo &TII = *TM.getInstrInfo();
709 DebugLoc dl = MI->getDebugLoc();
710 assert((MI->getOpcode() == SystemZ::Select32 ||
711 MI->getOpcode() == SystemZ::SelectF32 ||
712 MI->getOpcode() == SystemZ::Select64 ||
713 MI->getOpcode() == SystemZ::SelectF64) &&
714 "Unexpected instr type to insert");
716 // To "insert" a SELECT instruction, we actually have to insert the diamond
717 // control-flow pattern. The incoming instruction knows the destination vreg
718 // to set, the condition code register to branch on, the true/false values to
719 // select between, and a branch opcode to use.
720 const BasicBlock *LLVM_BB = BB->getBasicBlock();
721 MachineFunction::iterator I = BB;
729 // fallthrough --> copy0MBB
730 MachineBasicBlock *thisMBB = BB;
731 MachineFunction *F = BB->getParent();
732 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
733 MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB);
734 SystemZCC::CondCodes CC = (SystemZCC::CondCodes)MI->getOperand(3).getImm();
735 BuildMI(BB, dl, TII.getBrCond(CC)).addMBB(copy1MBB);
736 F->insert(I, copy0MBB);
737 F->insert(I, copy1MBB);
738 // Update machine-CFG edges by transferring all successors of the current
739 // block to the new block which will contain the Phi node for the select.
740 copy1MBB->transferSuccessors(BB);
741 // Next, add the true and fallthrough blocks as its successors.
742 BB->addSuccessor(copy0MBB);
743 BB->addSuccessor(copy1MBB);
747 // # fallthrough to copy1MBB
750 // Update machine-CFG edges
751 BB->addSuccessor(copy1MBB);
754 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
757 BuildMI(BB, dl, TII.get(SystemZ::PHI),
758 MI->getOperand(0).getReg())
759 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
760 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
762 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.