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);
132 // We have only 64-bit bitconverts
133 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Promote);
134 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Promote);
136 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
137 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
138 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
139 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
141 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
144 SDValue SystemZTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
145 switch (Op.getOpcode()) {
146 case ISD::FORMAL_ARGUMENTS: return LowerFORMAL_ARGUMENTS(Op, DAG);
147 case ISD::RET: return LowerRET(Op, DAG);
148 case ISD::CALL: return LowerCALL(Op, DAG);
149 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
150 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
151 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
152 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
153 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
155 assert(0 && "unimplemented operand");
160 //===----------------------------------------------------------------------===//
161 // Calling Convention Implementation
162 //===----------------------------------------------------------------------===//
164 #include "SystemZGenCallingConv.inc"
166 SDValue SystemZTargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op,
168 unsigned CC = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
171 assert(0 && "Unsupported calling convention");
173 case CallingConv::Fast:
174 return LowerCCCArguments(Op, DAG);
178 SDValue SystemZTargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
179 CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
180 unsigned CallingConv = TheCall->getCallingConv();
181 switch (CallingConv) {
183 assert(0 && "Unsupported calling convention");
184 case CallingConv::Fast:
186 return LowerCCCCallTo(Op, DAG, CallingConv);
190 /// LowerCCCArguments - transform physical registers into virtual registers and
191 /// generate load operations for arguments places on the stack.
192 // FIXME: struct return stuff
194 SDValue SystemZTargetLowering::LowerCCCArguments(SDValue Op,
196 MachineFunction &MF = DAG.getMachineFunction();
197 MachineFrameInfo *MFI = MF.getFrameInfo();
198 MachineRegisterInfo &RegInfo = MF.getRegInfo();
199 SDValue Root = Op.getOperand(0);
200 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() != 0;
201 unsigned CC = MF.getFunction()->getCallingConv();
202 DebugLoc dl = Op.getDebugLoc();
204 // Assign locations to all of the incoming arguments.
205 SmallVector<CCValAssign, 16> ArgLocs;
206 CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
207 CCInfo.AnalyzeFormalArguments(Op.getNode(), CC_SystemZ);
209 assert(!isVarArg && "Varargs not supported yet");
211 SmallVector<SDValue, 16> ArgValues;
212 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
213 CCValAssign &VA = ArgLocs[i];
215 // Arguments passed in registers
216 MVT RegVT = VA.getLocVT();
217 TargetRegisterClass *RC;
218 switch (RegVT.getSimpleVT()) {
220 cerr << "LowerFORMAL_ARGUMENTS Unhandled argument type: "
221 << RegVT.getSimpleVT()
225 RC = SystemZ::GR64RegisterClass;
228 RC = SystemZ::FP32RegisterClass;
231 RC = SystemZ::FP64RegisterClass;
235 unsigned VReg = RegInfo.createVirtualRegister(RC);
236 RegInfo.addLiveIn(VA.getLocReg(), VReg);
237 SDValue ArgValue = DAG.getCopyFromReg(Root, dl, VReg, RegVT);
239 // If this is an 8/16/32-bit value, it is really passed promoted to 64
240 // bits. Insert an assert[sz]ext to capture this, then truncate to the
242 if (VA.getLocInfo() == CCValAssign::SExt)
243 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
244 DAG.getValueType(VA.getValVT()));
245 else if (VA.getLocInfo() == CCValAssign::ZExt)
246 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
247 DAG.getValueType(VA.getValVT()));
249 if (VA.getLocInfo() != CCValAssign::Full)
250 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
252 ArgValues.push_back(ArgValue);
255 assert(VA.isMemLoc());
257 // Create the nodes corresponding to a load from this parameter slot.
258 // Create the frame index object for this incoming parameter...
259 int FI = MFI->CreateFixedObject(VA.getValVT().getSizeInBits()/8,
260 VA.getLocMemOffset());
262 // Create the SelectionDAG nodes corresponding to a load
263 //from this parameter
264 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
265 ArgValues.push_back(DAG.getLoad(VA.getValVT(), dl, Root, FIN,
266 PseudoSourceValue::getFixedStack(FI), 0));
270 ArgValues.push_back(Root);
272 // Return the new list of results.
273 return DAG.getNode(ISD::MERGE_VALUES, dl, Op.getNode()->getVTList(),
274 &ArgValues[0], ArgValues.size()).getValue(Op.getResNo());
277 /// LowerCCCCallTo - functions arguments are copied from virtual regs to
278 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
280 SDValue SystemZTargetLowering::LowerCCCCallTo(SDValue Op, SelectionDAG &DAG,
282 CallSDNode *TheCall = cast<CallSDNode>(Op.getNode());
283 SDValue Chain = TheCall->getChain();
284 SDValue Callee = TheCall->getCallee();
285 bool isVarArg = TheCall->isVarArg();
286 DebugLoc dl = Op.getDebugLoc();
287 MachineFunction &MF = DAG.getMachineFunction();
289 // Offset to first argument stack slot.
290 const unsigned FirstArgOffset = 160;
292 // Analyze operands of the call, assigning locations to each operand.
293 SmallVector<CCValAssign, 16> ArgLocs;
294 CCState CCInfo(CC, isVarArg, getTargetMachine(), ArgLocs);
296 CCInfo.AnalyzeCallOperands(TheCall, CC_SystemZ);
298 // Get a count of how many bytes are to be pushed on the stack.
299 unsigned NumBytes = CCInfo.getNextStackOffset();
301 Chain = DAG.getCALLSEQ_START(Chain ,DAG.getConstant(NumBytes,
302 getPointerTy(), true));
304 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
305 SmallVector<SDValue, 12> MemOpChains;
308 // Walk the register/memloc assignments, inserting copies/loads.
309 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
310 CCValAssign &VA = ArgLocs[i];
312 // Arguments start after the 5 first operands of ISD::CALL
313 SDValue Arg = TheCall->getArg(i);
315 // Promote the value if needed.
316 switch (VA.getLocInfo()) {
317 default: assert(0 && "Unknown loc info!");
318 case CCValAssign::Full: break;
319 case CCValAssign::SExt:
320 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
322 case CCValAssign::ZExt:
323 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
325 case CCValAssign::AExt:
326 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
330 // Arguments that can be passed on register must be kept at RegsToPass
333 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
335 assert(VA.isMemLoc());
337 if (StackPtr.getNode() == 0)
339 DAG.getCopyFromReg(Chain, dl,
340 (RegInfo->hasFP(MF) ?
341 SystemZ::R11D : SystemZ::R15D),
344 unsigned Offset = FirstArgOffset + VA.getLocMemOffset();
345 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
347 DAG.getIntPtrConstant(Offset));
349 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
350 PseudoSourceValue::getStack(), Offset));
354 // Transform all store nodes into one single node because all store nodes are
355 // independent of each other.
356 if (!MemOpChains.empty())
357 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
358 &MemOpChains[0], MemOpChains.size());
360 // Build a sequence of copy-to-reg nodes chained together with token chain and
361 // flag operands which copy the outgoing args into registers. The InFlag in
362 // necessary since all emited instructions must be stuck together.
364 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
365 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
366 RegsToPass[i].second, InFlag);
367 InFlag = Chain.getValue(1);
370 // If the callee is a GlobalAddress node (quite common, every direct call is)
371 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
372 // Likewise ExternalSymbol -> TargetExternalSymbol.
373 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
374 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy());
375 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
376 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), getPointerTy());
378 // Returns a chain & a flag for retval copy to use.
379 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
380 SmallVector<SDValue, 8> Ops;
381 Ops.push_back(Chain);
382 Ops.push_back(Callee);
384 // Add argument registers to the end of the list so that they are
385 // known live into the call.
386 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
387 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
388 RegsToPass[i].second.getValueType()));
390 if (InFlag.getNode())
391 Ops.push_back(InFlag);
393 Chain = DAG.getNode(SystemZISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
394 InFlag = Chain.getValue(1);
396 // Create the CALLSEQ_END node.
397 Chain = DAG.getCALLSEQ_END(Chain,
398 DAG.getConstant(NumBytes, getPointerTy(), true),
399 DAG.getConstant(0, getPointerTy(), true),
401 InFlag = Chain.getValue(1);
403 // Handle result values, copying them out of physregs into vregs that we
405 return SDValue(LowerCallResult(Chain, InFlag, TheCall, CC, DAG),
409 /// LowerCallResult - Lower the result values of an ISD::CALL into the
410 /// appropriate copies out of appropriate physical registers. This assumes that
411 /// Chain/InFlag are the input chain/flag to use, and that TheCall is the call
412 /// being lowered. Returns a SDNode with the same number of values as the
415 SystemZTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
417 unsigned CallingConv,
419 bool isVarArg = TheCall->isVarArg();
420 DebugLoc dl = TheCall->getDebugLoc();
422 // Assign locations to each value returned by this call.
423 SmallVector<CCValAssign, 16> RVLocs;
424 CCState CCInfo(CallingConv, isVarArg, getTargetMachine(), RVLocs);
426 CCInfo.AnalyzeCallResult(TheCall, RetCC_SystemZ);
427 SmallVector<SDValue, 8> ResultVals;
429 // Copy all of the result registers out of their specified physreg.
430 for (unsigned i = 0; i != RVLocs.size(); ++i) {
431 CCValAssign &VA = RVLocs[i];
433 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
434 VA.getLocVT(), InFlag).getValue(1);
435 SDValue RetValue = Chain.getValue(0);
436 InFlag = Chain.getValue(2);
438 // If this is an 8/16/32-bit value, it is really passed promoted to 64
439 // bits. Insert an assert[sz]ext to capture this, then truncate to the
441 if (VA.getLocInfo() == CCValAssign::SExt)
442 RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
443 DAG.getValueType(VA.getValVT()));
444 else if (VA.getLocInfo() == CCValAssign::ZExt)
445 RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
446 DAG.getValueType(VA.getValVT()));
448 if (VA.getLocInfo() != CCValAssign::Full)
449 RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
451 ResultVals.push_back(RetValue);
454 ResultVals.push_back(Chain);
456 // Merge everything together with a MERGE_VALUES node.
457 return DAG.getNode(ISD::MERGE_VALUES, dl, TheCall->getVTList(),
458 &ResultVals[0], ResultVals.size()).getNode();
462 SDValue SystemZTargetLowering::LowerRET(SDValue Op, SelectionDAG &DAG) {
463 // CCValAssign - represent the assignment of the return value to a location
464 SmallVector<CCValAssign, 16> RVLocs;
465 unsigned CC = DAG.getMachineFunction().getFunction()->getCallingConv();
466 bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg();
467 DebugLoc dl = Op.getDebugLoc();
469 // CCState - Info about the registers and stack slot.
470 CCState CCInfo(CC, isVarArg, getTargetMachine(), RVLocs);
472 // Analize return values of ISD::RET
473 CCInfo.AnalyzeReturn(Op.getNode(), RetCC_SystemZ);
475 // If this is the first return lowered for this function, add the regs to the
476 // liveout set for the function.
477 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
478 for (unsigned i = 0; i != RVLocs.size(); ++i)
479 if (RVLocs[i].isRegLoc())
480 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
483 // The chain is always operand #0
484 SDValue Chain = Op.getOperand(0);
487 // Copy the result values into the output registers.
488 for (unsigned i = 0; i != RVLocs.size(); ++i) {
489 CCValAssign &VA = RVLocs[i];
490 SDValue ResValue = Op.getOperand(i*2+1);
491 assert(VA.isRegLoc() && "Can only return in registers!");
493 // If this is an 8/16/32-bit value, it is really should be passed promoted
495 if (VA.getLocInfo() == CCValAssign::SExt)
496 ResValue = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ResValue);
497 else if (VA.getLocInfo() == CCValAssign::ZExt)
498 ResValue = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), ResValue);
499 else if (VA.getLocInfo() == CCValAssign::AExt)
500 ResValue = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), ResValue);
502 // ISD::RET => ret chain, (regnum1,val1), ...
503 // So i*2+1 index only the regnums
504 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), ResValue, Flag);
506 // Guarantee that all emitted copies are stuck together,
507 // avoiding something bad.
508 Flag = Chain.getValue(1);
512 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
515 return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain);
518 SDValue SystemZTargetLowering::EmitCmp(SDValue LHS, SDValue RHS,
519 ISD::CondCode CC, SDValue &SystemZCC,
521 // FIXME: Emit a test if RHS is zero
523 bool isUnsigned = false;
524 SystemZCC::CondCodes TCC;
526 default: assert(0 && "Invalid integer condition!");
532 TCC = SystemZCC::NLH;
548 if (LHS.getValueType().isFloatingPoint()) {
552 isUnsigned = true; // FALLTHROUGH
558 if (LHS.getValueType().isFloatingPoint()) {
562 isUnsigned = true; // FALLTHROUGH
568 if (LHS.getValueType().isFloatingPoint()) {
569 TCC = SystemZCC::NLE;
572 isUnsigned = true; // FALLTHROUGH
578 if (LHS.getValueType().isFloatingPoint()) {
579 TCC = SystemZCC::NHE;
582 isUnsigned = true; // FALLTHROUGH
589 SystemZCC = DAG.getConstant(TCC, MVT::i32);
591 DebugLoc dl = LHS.getDebugLoc();
592 return DAG.getNode((isUnsigned ? SystemZISD::UCMP : SystemZISD::CMP),
593 dl, MVT::Flag, LHS, RHS);
597 SDValue SystemZTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) {
598 SDValue Chain = Op.getOperand(0);
599 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
600 SDValue LHS = Op.getOperand(2);
601 SDValue RHS = Op.getOperand(3);
602 SDValue Dest = Op.getOperand(4);
603 DebugLoc dl = Op.getDebugLoc();
606 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
607 return DAG.getNode(SystemZISD::BRCOND, dl, Op.getValueType(),
608 Chain, Dest, SystemZCC, Flag);
611 SDValue SystemZTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) {
612 SDValue LHS = Op.getOperand(0);
613 SDValue RHS = Op.getOperand(1);
614 SDValue TrueV = Op.getOperand(2);
615 SDValue FalseV = Op.getOperand(3);
616 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
617 DebugLoc dl = Op.getDebugLoc();
620 SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG);
622 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Flag);
623 SmallVector<SDValue, 4> Ops;
624 Ops.push_back(TrueV);
625 Ops.push_back(FalseV);
626 Ops.push_back(SystemZCC);
629 return DAG.getNode(SystemZISD::SELECT, dl, VTs, &Ops[0], Ops.size());
632 SDValue SystemZTargetLowering::LowerGlobalAddress(SDValue Op,
634 DebugLoc dl = Op.getDebugLoc();
635 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
636 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
638 bool IsPic = getTargetMachine().getRelocationModel() == Reloc::PIC_;
639 bool ExtraLoadRequired =
640 Subtarget.GVRequiresExtraLoad(GV, getTargetMachine(), false);
643 if (!IsPic && !ExtraLoadRequired) {
644 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), Offset);
647 unsigned char OpFlags = 0;
648 if (ExtraLoadRequired)
649 OpFlags = SystemZII::MO_GOTENT;
651 Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), 0, OpFlags);
654 Result = DAG.getNode(SystemZISD::PCRelativeWrapper, dl,
655 getPointerTy(), Result);
657 if (ExtraLoadRequired)
658 Result = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), Result,
659 PseudoSourceValue::getGOT(), 0);
661 // If there was a non-zero offset that we didn't fold, create an explicit
664 Result = DAG.getNode(ISD::ADD, dl, getPointerTy(), Result,
665 DAG.getConstant(Offset, getPointerTy()));
671 SDValue SystemZTargetLowering::LowerJumpTable(SDValue Op,
673 DebugLoc dl = Op.getDebugLoc();
674 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
675 SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy());
677 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
682 // FIXME: This is just dirty hack. We need to lower cpool properly
683 SDValue SystemZTargetLowering::LowerConstantPool(SDValue Op,
685 DebugLoc dl = Op.getDebugLoc();
686 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
688 SDValue Result = DAG.getTargetConstantPool(CP->getConstVal(), getPointerTy(),
692 return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result);
695 const char *SystemZTargetLowering::getTargetNodeName(unsigned Opcode) const {
697 case SystemZISD::RET_FLAG: return "SystemZISD::RET_FLAG";
698 case SystemZISD::CALL: return "SystemZISD::CALL";
699 case SystemZISD::BRCOND: return "SystemZISD::BRCOND";
700 case SystemZISD::CMP: return "SystemZISD::CMP";
701 case SystemZISD::UCMP: return "SystemZISD::UCMP";
702 case SystemZISD::SELECT: return "SystemZISD::SELECT";
703 case SystemZISD::PCRelativeWrapper: return "SystemZISD::PCRelativeWrapper";
704 default: return NULL;
708 //===----------------------------------------------------------------------===//
709 // Other Lowering Code
710 //===----------------------------------------------------------------------===//
713 SystemZTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
714 MachineBasicBlock *BB) const {
715 const SystemZInstrInfo &TII = *TM.getInstrInfo();
716 DebugLoc dl = MI->getDebugLoc();
717 assert((MI->getOpcode() == SystemZ::Select32 ||
718 MI->getOpcode() == SystemZ::SelectF32 ||
719 MI->getOpcode() == SystemZ::Select64 ||
720 MI->getOpcode() == SystemZ::SelectF64) &&
721 "Unexpected instr type to insert");
723 // To "insert" a SELECT instruction, we actually have to insert the diamond
724 // control-flow pattern. The incoming instruction knows the destination vreg
725 // to set, the condition code register to branch on, the true/false values to
726 // select between, and a branch opcode to use.
727 const BasicBlock *LLVM_BB = BB->getBasicBlock();
728 MachineFunction::iterator I = BB;
736 // fallthrough --> copy0MBB
737 MachineBasicBlock *thisMBB = BB;
738 MachineFunction *F = BB->getParent();
739 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
740 MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB);
741 SystemZCC::CondCodes CC = (SystemZCC::CondCodes)MI->getOperand(3).getImm();
742 BuildMI(BB, dl, TII.getBrCond(CC)).addMBB(copy1MBB);
743 F->insert(I, copy0MBB);
744 F->insert(I, copy1MBB);
745 // Update machine-CFG edges by transferring all successors of the current
746 // block to the new block which will contain the Phi node for the select.
747 copy1MBB->transferSuccessors(BB);
748 // Next, add the true and fallthrough blocks as its successors.
749 BB->addSuccessor(copy0MBB);
750 BB->addSuccessor(copy1MBB);
754 // # fallthrough to copy1MBB
757 // Update machine-CFG edges
758 BB->addSuccessor(copy1MBB);
761 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
764 BuildMI(BB, dl, TII.get(SystemZ::PHI),
765 MI->getOperand(0).getReg())
766 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
767 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
769 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.