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);
56 // Compute derived properties from the register classes
57 computeRegisterProperties();
59 // Set shifts properties
60 setShiftAmountFlavor(Extend);
61 setShiftAmountType(MVT::i64);
63 // Provide all sorts of operation actions
64 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
65 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
66 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
68 setLoadExtAction(ISD::SEXTLOAD, MVT::f32, Promote);
69 setLoadExtAction(ISD::ZEXTLOAD, MVT::f32, Promote);
70 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Promote);
71 setLoadExtAction(ISD::SEXTLOAD, MVT::f64, Promote);
72 setLoadExtAction(ISD::ZEXTLOAD, MVT::f64, Promote);
73 setLoadExtAction(ISD::EXTLOAD, MVT::f64, Promote);
75 setStackPointerRegisterToSaveRestore(SystemZ::R15D);
76 setSchedulingPreference(SchedulingForLatency);
78 setOperationAction(ISD::RET, MVT::Other, Custom);
80 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
81 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
82 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
83 setOperationAction(ISD::BR_CC, MVT::i64, Custom);
84 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
85 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
86 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
87 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
88 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
89 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
90 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
92 setOperationAction(ISD::SDIV, MVT::i32, Expand);
93 setOperationAction(ISD::UDIV, MVT::i32, Expand);
94 setOperationAction(ISD::SDIV, MVT::i64, Expand);
95 setOperationAction(ISD::UDIV, MVT::i64, Expand);
96 setOperationAction(ISD::SREM, MVT::i32, Expand);
97 setOperationAction(ISD::UREM, MVT::i32, Expand);
98 setOperationAction(ISD::SREM, MVT::i64, Expand);
99 setOperationAction(ISD::UREM, MVT::i64, Expand);
101 // FIXME: Can we lower these 2 efficiently?
102 setOperationAction(ISD::SETCC, MVT::i32, Expand);
103 setOperationAction(ISD::SETCC, MVT::i64, Expand);
104 setOperationAction(ISD::SELECT, MVT::i32, Expand);
105 setOperationAction(ISD::SELECT, MVT::i64, Expand);
106 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
107 setOperationAction(ISD::SELECT_CC, MVT::i64, Custom);
108 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
109 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
111 // Funny enough: we don't have 64-bit signed versions of these stuff, but have
113 setOperationAction(ISD::MULHS, MVT::i64, Expand);
114 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
116 setOperationAction(ISD::FSIN, MVT::f32, Expand);
117 setOperationAction(ISD::FSIN, MVT::f64, Expand);
118 setOperationAction(ISD::FCOS, MVT::f32, Expand);
119 setOperationAction(ISD::FCOS, MVT::f64, Expand);
122 SDValue SystemZTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
123 switch (Op.getOpcode()) {
124 case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG);
125 case ISD::RET: return LowerRET(Op, DAG);
126 case ISD::CALL: return LowerCALL(Op, DAG);
127 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
128 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
129 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
130 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
131 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
133 assert(0 && "unimplemented operand");
138 //===----------------------------------------------------------------------===//
139 // Calling Convention Implementation
140 //===----------------------------------------------------------------------===//
142 #include "SystemZGenCallingConv.inc"
144 SDValue SystemZTargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op,
146 unsigned CC = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
149 assert(0 && "Unsupported calling convention");
151 case CallingConv::Fast:
152 return LowerCCCArguments(Op, DAG);
156 SDValue SystemZTargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
157 CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
158 unsigned CallingConv = TheCall->getCallingConv();
159 switch (CallingConv) {
161 assert(0 && "Unsupported calling convention");
162 case CallingConv::Fast:
164 return LowerCCCCallTo(Op, DAG, CallingConv);
168 /// LowerCCCArguments - transform physical registers into virtual registers and
169 /// generate load operations for arguments places on the stack.
170 // FIXME: struct return stuff
172 SDValue SystemZTargetLowering::LowerCCCArguments(SDValue Op,
174 MachineFunction &MF = DAG.getMachineFunction();
175 MachineFrameInfo *MFI = MF.getFrameInfo();
176 MachineRegisterInfo &RegInfo = MF.getRegInfo();
177 SDValue Root = Op.getOperand(0);
178 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
179 unsigned CC = MF.getFunction()->getCallingConv();
180 DebugLoc dl = Op.getDebugLoc();
182 // Assign locations to all of the incoming arguments.
183 SmallVector<CCValAssign, 16> ArgLocs;
184 CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
185 CCInfo.AnalyzeFormalArguments(Op.getNode(), CC_SystemZ);
187 assert(!isVarArg && "Varargs not supported yet");
189 SmallVector<SDValue, 16> ArgValues;
190 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
191 CCValAssign &VA = ArgLocs[i];
193 // Arguments passed in registers
194 MVT RegVT = VA.getLocVT();
195 TargetRegisterClass *RC;
196 switch (RegVT.getSimpleVT()) {
198 cerr << "LowerFORMAL_ARGUMENTS Unhandled argument type: "
199 << RegVT.getSimpleVT()
203 RC = SystemZ::GR64RegisterClass;
206 RC = SystemZ::FP32RegisterClass;
209 RC = SystemZ::FP64RegisterClass;
213 unsigned VReg = RegInfo.createVirtualRegister(RC);
214 RegInfo.addLiveIn(VA.getLocReg(), VReg);
215 SDValue ArgValue = DAG.getCopyFromReg(Root, dl, VReg, RegVT);
217 // If this is an 8/16/32-bit value, it is really passed promoted to 64
218 // bits. Insert an assert[sz]ext to capture this, then truncate to the
220 if (VA.getLocInfo() == CCValAssign::SExt)
221 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
222 DAG.getValueType(VA.getValVT()));
223 else if (VA.getLocInfo() == CCValAssign::ZExt)
224 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
225 DAG.getValueType(VA.getValVT()));
227 if (VA.getLocInfo() != CCValAssign::Full)
228 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
230 ArgValues.push_back(ArgValue);
233 assert(VA.isMemLoc());
235 // Create the nodes corresponding to a load from this parameter slot.
236 // Create the frame index object for this incoming parameter...
237 int FI = MFI->CreateFixedObject(VA.getValVT().getSizeInBits()/8,
238 VA.getLocMemOffset());
240 // Create the SelectionDAG nodes corresponding to a load
241 //from this parameter
242 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
243 ArgValues.push_back(DAG.getLoad(VA.getValVT(), dl, Root, FIN,
244 PseudoSourceValue::getFixedStack(FI), 0));
248 ArgValues.push_back(Root);
250 // Return the new list of results.
251 return DAG.getNode(ISD::MERGE_VALUES, dl, Op.getNode()->getVTList(),
252 &ArgValues[0], ArgValues.size()).getValue(Op.getResNo());
255 /// LowerCCCCallTo - functions arguments are copied from virtual regs to
256 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
258 SDValue SystemZTargetLowering::LowerCCCCallTo(SDValue Op, SelectionDAG &DAG,
260 CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
261 SDValue Chain = TheCall->getChain();
262 SDValue Callee = TheCall->getCallee();
263 bool isVarArg = TheCall->isVarArg();
264 DebugLoc dl = Op.getDebugLoc();
265 MachineFunction &MF = DAG.getMachineFunction();
267 // Offset to first argument stack slot.
268 const unsigned FirstArgOffset = 160;
270 // Analyze operands of the call, assigning locations to each operand.
271 SmallVector<CCValAssign, 16> ArgLocs;
272 CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
274 CCInfo.AnalyzeCallOperands(TheCall, CC_SystemZ);
276 // Get a count of how many bytes are to be pushed on the stack.
277 unsigned NumBytes = CCInfo.getNextStackOffset();
279 Chain = DAG.getCALLSEQ_START(Chain ,DAG.getConstant(NumBytes,
280 getPointerTy(), true));
282 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
283 SmallVector<SDValue, 12> MemOpChains;
286 // Walk the register/memloc assignments, inserting copies/loads.
287 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
288 CCValAssign &VA = ArgLocs[i];
290 // Arguments start after the 5 first operands of ISD::CALL
291 SDValue Arg = TheCall->getArg(i);
293 // Promote the value if needed.
294 switch (VA.getLocInfo()) {
295 default: assert(0 && "Unknown loc info!");
296 case CCValAssign::Full: break;
297 case CCValAssign::SExt:
298 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
300 case CCValAssign::ZExt:
301 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
303 case CCValAssign::AExt:
304 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
308 // Arguments that can be passed on register must be kept at RegsToPass
311 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
313 assert(VA.isMemLoc());
315 if (StackPtr.getNode() == 0)
317 DAG.getCopyFromReg(Chain, dl,
318 (RegInfo->hasFP(MF) ?
319 SystemZ::R11D : SystemZ::R15D),
322 unsigned Offset = FirstArgOffset + VA.getLocMemOffset();
323 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
325 DAG.getIntPtrConstant(Offset));
327 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
328 PseudoSourceValue::getStack(), Offset));
332 // Transform all store nodes into one single node because all store nodes are
333 // independent of each other.
334 if (!MemOpChains.empty())
335 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
336 &MemOpChains[0], MemOpChains.size());
338 // Build a sequence of copy-to-reg nodes chained together with token chain and
339 // flag operands which copy the outgoing args into registers. The InFlag in
340 // necessary since all emited instructions must be stuck together.
342 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
343 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
344 RegsToPass[i].second, 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(), getPointerTy());
353 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
354 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), getPointerTy());
356 // Returns a chain & a flag for retval copy to use.
357 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
358 SmallVector<SDValue, 8> Ops;
359 Ops.push_back(Chain);
360 Ops.push_back(Callee);
362 // Add argument registers to the end of the list so that they are
363 // known live into the call.
364 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
365 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
366 RegsToPass[i].second.getValueType()));
368 if (InFlag.getNode())
369 Ops.push_back(InFlag);
371 Chain = DAG.getNode(SystemZISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
372 InFlag = Chain.getValue(1);
374 // Create the CALLSEQ_END node.
375 Chain = DAG.getCALLSEQ_END(Chain,
376 DAG.getConstant(NumBytes, getPointerTy(), true),
377 DAG.getConstant(0, getPointerTy(), true),
379 InFlag = Chain.getValue(1);
381 // Handle result values, copying them out of physregs into vregs that we
383 return SDValue(LowerCallResult(Chain, InFlag, TheCall, CC, DAG),
387 /// LowerCallResult - Lower the result values of an ISD::CALL into the
388 /// appropriate copies out of appropriate physical registers. This assumes that
389 /// Chain/InFlag are the input chain/flag to use, and that TheCall is the call
390 /// being lowered. Returns a SDNode with the same number of values as the
393 SystemZTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
395 unsigned CallingConv,
397 bool isVarArg = TheCall->isVarArg();
398 DebugLoc dl = TheCall->getDebugLoc();
400 // Assign locations to each value returned by this call.
401 SmallVector<CCValAssign, 16> RVLocs;
402 CCState CCInfo(CallingConv, isVarArg, getTargetMachine(), RVLocs);
404 CCInfo.AnalyzeCallResult(TheCall, RetCC_SystemZ);
405 SmallVector<SDValue, 8> ResultVals;
407 // Copy all of the result registers out of their specified physreg.
408 for (unsigned i = 0; i != RVLocs.size(); ++i) {
409 CCValAssign &VA = RVLocs[i];
411 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
412 VA.getLocVT(), InFlag).getValue(1);
413 SDValue RetValue = Chain.getValue(0);
414 InFlag = Chain.getValue(2);
416 // If this is an 8/16/32-bit value, it is really passed promoted to 64
417 // bits. Insert an assert[sz]ext to capture this, then truncate to the
419 if (VA.getLocInfo() == CCValAssign::SExt)
420 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
421 DAG.getValueType(VA.getValVT()));
422 else if (VA.getLocInfo() == CCValAssign::ZExt)
423 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
424 DAG.getValueType(VA.getValVT()));
426 if (VA.getLocInfo() != CCValAssign::Full)
427 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
429 ResultVals.push_back(RetValue);
432 ResultVals.push_back(Chain);
434 // Merge everything together with a MERGE_VALUES node.
435 return DAG.getNode(ISD::MERGE_VALUES, dl, TheCall->getVTList(),
436 &ResultVals[0], ResultVals.size()).getNode();
440 SDValue SystemZTargetLowering::LowerRET(SDValue Op, SelectionDAG &DAG) {
441 // CCValAssign - represent the assignment of the return value to a location
442 SmallVector<CCValAssign, 16> RVLocs;
443 unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
444 bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
445 DebugLoc dl = Op.getDebugLoc();
447 // CCState - Info about the registers and stack slot.
448 CCState CCInfo(CC, isVarArg, getTargetMachine(), RVLocs);
450 // Analize return values of ISD::RET
451 CCInfo.AnalyzeReturn(Op.getNode(), RetCC_SystemZ);
453 // If this is the first return lowered for this function, add the regs to the
454 // liveout set for the function.
455 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
456 for (unsigned i = 0; i != RVLocs.size(); ++i)
457 if (RVLocs[i].isRegLoc())
458 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
461 // The chain is always operand #0
462 SDValue Chain = Op.getOperand(0);
465 // Copy the result values into the output registers.
466 for (unsigned i = 0; i != RVLocs.size(); ++i) {
467 CCValAssign &VA = RVLocs[i];
468 SDValue ResValue = Op.getOperand(i*2+1);
469 assert(VA.isRegLoc() && "Can only return in registers!");
471 // If this is an 8/16/32-bit value, it is really should be passed promoted
473 if (VA.getLocInfo() == CCValAssign::SExt)
474 ResValue = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ResValue);
475 else if (VA.getLocInfo() == CCValAssign::ZExt)
476 ResValue = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), ResValue);
477 else if (VA.getLocInfo() == CCValAssign::AExt)
478 ResValue = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), ResValue);
480 // ISD::RET => ret chain, (regnum1,val1), ...
481 // So i*2+1 index only the regnums
482 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), ResValue, Flag);
484 // Guarantee that all emitted copies are stuck together,
485 // avoiding something bad.
486 Flag = Chain.getValue(1);
490 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
493 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain);
496 SDValue SystemZTargetLowering::EmitCmp(SDValue LHS, SDValue RHS,
497 ISD::CondCode CC, SDValue &SystemZCC,
499 // FIXME: Emit a test if RHS is zero
501 bool isUnsigned = false;
502 SystemZCC::CondCodes TCC;
504 default: assert(0 && "Invalid integer condition!");
510 TCC = SystemZCC::NLH;
526 if (LHS.getValueType().isFloatingPoint()) {
530 isUnsigned = true; // FALLTHROUGH
536 if (LHS.getValueType().isFloatingPoint()) {
540 isUnsigned = true; // FALLTHROUGH
546 if (LHS.getValueType().isFloatingPoint()) {
547 TCC = SystemZCC::NLE;
550 isUnsigned = true; // FALLTHROUGH
556 if (LHS.getValueType().isFloatingPoint()) {
557 TCC = SystemZCC::NHE;
560 isUnsigned = true; // FALLTHROUGH
567 SystemZCC = DAG.getConstant(TCC, MVT::i32);
569 DebugLoc dl = LHS.getDebugLoc();
570 return DAG.getNode((isUnsigned ? SystemZISD::UCMP : SystemZISD::CMP),
571 dl, MVT::Flag, LHS, RHS);
575 SDValue SystemZTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
576 SDValue Chain = Op.getOperand(0);
577 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
578 SDValue LHS = Op.getOperand(2);
579 SDValue RHS = Op.getOperand(3);
580 SDValue Dest = Op.getOperand(4);
581 DebugLoc dl = Op.getDebugLoc();
584 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
585 return DAG.getNode(SystemZISD::BRCOND, dl, Op.getValueType(),
586 Chain, Dest, SystemZCC, Flag);
589 SDValue SystemZTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
590 SDValue LHS = Op.getOperand(0);
591 SDValue RHS = Op.getOperand(1);
592 SDValue TrueV = Op.getOperand(2);
593 SDValue FalseV = Op.getOperand(3);
594 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
595 DebugLoc dl = Op.getDebugLoc();
598 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
600 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Flag);
601 SmallVector<SDValue, 4> Ops;
602 Ops.push_back(TrueV);
603 Ops.push_back(FalseV);
604 Ops.push_back(SystemZCC);
607 return DAG.getNode(SystemZISD::SELECT, dl, VTs, &Ops[0], Ops.size());
610 SDValue SystemZTargetLowering::LowerGlobalAddress(SDValue Op,
612 DebugLoc dl = Op.getDebugLoc();
613 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
614 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
616 bool IsPic = getTargetMachine().getRelocationModel() == Reloc::PIC_;
617 bool ExtraLoadRequired =
618 Subtarget.GVRequiresExtraLoad(GV, getTargetMachine(), false);
621 if (!IsPic && !ExtraLoadRequired) {
622 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), Offset);
625 unsigned char OpFlags = 0;
626 if (ExtraLoadRequired)
627 OpFlags = SystemZII::MO_GOTENT;
629 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), 0, OpFlags);
632 Result = DAG.getNode(SystemZISD::PCRelativeWrapper, dl,
633 getPointerTy(), Result);
635 if (ExtraLoadRequired)
636 Result = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), Result,
637 PseudoSourceValue::getGOT(), 0);
639 // If there was a non-zero offset that we didn't fold, create an explicit
642 Result = DAG.getNode(ISD::ADD, dl, getPointerTy(), Result,
643 DAG.getConstant(Offset, getPointerTy()));
649 SDValue SystemZTargetLowering::LowerJumpTable(SDValue Op,
651 DebugLoc dl = Op.getDebugLoc();
652 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
653 SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy());
655 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
660 // FIXME: This is just dirty hack. We need to lower cpool properly
661 SDValue SystemZTargetLowering::LowerConstantPool(SDValue Op,
663 DebugLoc dl = Op.getDebugLoc();
664 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
666 SDValue Result = DAG.getTargetConstantPool(CP->getConstVal(), getPointerTy(),
670 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
673 const char *SystemZTargetLowering::getTargetNodeName(unsigned Opcode) const {
675 case SystemZISD::RET_FLAG: return "SystemZISD::RET_FLAG";
676 case SystemZISD::CALL: return "SystemZISD::CALL";
677 case SystemZISD::BRCOND: return "SystemZISD::BRCOND";
678 case SystemZISD::CMP: return "SystemZISD::CMP";
679 case SystemZISD::UCMP: return "SystemZISD::UCMP";
680 case SystemZISD::SELECT: return "SystemZISD::SELECT";
681 case SystemZISD::PCRelativeWrapper: return "SystemZISD::PCRelativeWrapper";
682 default: return NULL;
686 //===----------------------------------------------------------------------===//
687 // Other Lowering Code
688 //===----------------------------------------------------------------------===//
691 SystemZTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
692 MachineBasicBlock *BB) const {
693 const SystemZInstrInfo &TII = *TM.getInstrInfo();
694 DebugLoc dl = MI->getDebugLoc();
695 assert((MI->getOpcode() == SystemZ::Select32 ||
696 MI->getOpcode() == SystemZ::Select64) &&
697 "Unexpected instr type to insert");
699 // To "insert" a SELECT instruction, we actually have to insert the diamond
700 // control-flow pattern. The incoming instruction knows the destination vreg
701 // to set, the condition code register to branch on, the true/false values to
702 // select between, and a branch opcode to use.
703 const BasicBlock *LLVM_BB = BB->getBasicBlock();
704 MachineFunction::iterator I = BB;
712 // fallthrough --> copy0MBB
713 MachineBasicBlock *thisMBB = BB;
714 MachineFunction *F = BB->getParent();
715 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
716 MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB);
717 SystemZCC::CondCodes CC = (SystemZCC::CondCodes)MI->getOperand(3).getImm();
718 BuildMI(BB, dl, TII.getBrCond(CC)).addMBB(copy1MBB);
719 F->insert(I, copy0MBB);
720 F->insert(I, copy1MBB);
721 // Update machine-CFG edges by transferring all successors of the current
722 // block to the new block which will contain the Phi node for the select.
723 copy1MBB->transferSuccessors(BB);
724 // Next, add the true and fallthrough blocks as its successors.
725 BB->addSuccessor(copy0MBB);
726 BB->addSuccessor(copy1MBB);
730 // # fallthrough to copy1MBB
733 // Update machine-CFG edges
734 BB->addSuccessor(copy1MBB);
737 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
740 BuildMI(BB, dl, TII.get(SystemZ::PHI),
741 MI->getOperand(0).getReg())
742 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
743 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
745 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.