1 //===-- MBlazeISelLowering.cpp - MBlaze 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 defines the interfaces that MBlaze uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "mblaze-lower"
16 #include "MBlazeISelLowering.h"
17 #include "MBlazeMachineFunction.h"
18 #include "MBlazeSubtarget.h"
19 #include "MBlazeTargetMachine.h"
20 #include "MBlazeTargetObjectFile.h"
21 #include "llvm/CodeGen/CallingConvLower.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/MachineFunction.h"
24 #include "llvm/CodeGen/MachineInstrBuilder.h"
25 #include "llvm/CodeGen/MachineRegisterInfo.h"
26 #include "llvm/CodeGen/SelectionDAGISel.h"
27 #include "llvm/CodeGen/ValueTypes.h"
28 #include "llvm/IR/CallingConv.h"
29 #include "llvm/IR/DerivedTypes.h"
30 #include "llvm/IR/Function.h"
31 #include "llvm/IR/GlobalVariable.h"
32 #include "llvm/IR/Intrinsics.h"
33 #include "llvm/Support/Debug.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/raw_ostream.h"
38 static bool CC_MBlaze_AssignReg(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
39 CCValAssign::LocInfo &LocInfo,
40 ISD::ArgFlagsTy &ArgFlags,
43 const char *MBlazeTargetLowering::getTargetNodeName(unsigned Opcode) const {
45 case MBlazeISD::JmpLink : return "MBlazeISD::JmpLink";
46 case MBlazeISD::GPRel : return "MBlazeISD::GPRel";
47 case MBlazeISD::Wrap : return "MBlazeISD::Wrap";
48 case MBlazeISD::ICmp : return "MBlazeISD::ICmp";
49 case MBlazeISD::Ret : return "MBlazeISD::Ret";
50 case MBlazeISD::Select_CC : return "MBlazeISD::Select_CC";
51 default : return NULL;
55 MBlazeTargetLowering::MBlazeTargetLowering(MBlazeTargetMachine &TM)
56 : TargetLowering(TM, new MBlazeTargetObjectFile()) {
57 Subtarget = &TM.getSubtarget<MBlazeSubtarget>();
59 // MBlaze does not have i1 type, so use i32 for
60 // setcc operations results (slt, sgt, ...).
61 setBooleanContents(ZeroOrOneBooleanContent);
62 setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct?
64 // Set up the register classes
65 addRegisterClass(MVT::i32, &MBlaze::GPRRegClass);
66 if (Subtarget->hasFPU()) {
67 addRegisterClass(MVT::f32, &MBlaze::GPRRegClass);
68 setOperationAction(ISD::ConstantFP, MVT::f32, Legal);
71 // Floating point operations which are not supported
72 setOperationAction(ISD::FREM, MVT::f32, Expand);
73 setOperationAction(ISD::FMA, MVT::f32, Expand);
74 setOperationAction(ISD::UINT_TO_FP, MVT::i8, Expand);
75 setOperationAction(ISD::UINT_TO_FP, MVT::i16, Expand);
76 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
77 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
78 setOperationAction(ISD::FP_ROUND, MVT::f32, Expand);
79 setOperationAction(ISD::FP_ROUND, MVT::f64, Expand);
80 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
81 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
82 setOperationAction(ISD::FSIN, MVT::f32, Expand);
83 setOperationAction(ISD::FCOS, MVT::f32, Expand);
84 setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
85 setOperationAction(ISD::FPOWI, MVT::f32, Expand);
86 setOperationAction(ISD::FPOW, MVT::f32, Expand);
87 setOperationAction(ISD::FLOG, MVT::f32, Expand);
88 setOperationAction(ISD::FLOG2, MVT::f32, Expand);
89 setOperationAction(ISD::FLOG10, MVT::f32, Expand);
90 setOperationAction(ISD::FEXP, MVT::f32, Expand);
92 // Load extented operations for i1 types must be promoted
93 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
94 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
95 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
97 // Sign extended loads must be expanded
98 setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
99 setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand);
101 // MBlaze has no REM or DIVREM operations.
102 setOperationAction(ISD::UREM, MVT::i32, Expand);
103 setOperationAction(ISD::SREM, MVT::i32, Expand);
104 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
105 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
107 // If the processor doesn't support multiply then expand it
108 if (!Subtarget->hasMul()) {
109 setOperationAction(ISD::MUL, MVT::i32, Expand);
112 // If the processor doesn't support 64-bit multiply then expand
113 if (!Subtarget->hasMul() || !Subtarget->hasMul64()) {
114 setOperationAction(ISD::MULHS, MVT::i32, Expand);
115 setOperationAction(ISD::MULHS, MVT::i64, Expand);
116 setOperationAction(ISD::MULHU, MVT::i32, Expand);
117 setOperationAction(ISD::MULHU, MVT::i64, Expand);
120 // If the processor doesn't support division then expand
121 if (!Subtarget->hasDiv()) {
122 setOperationAction(ISD::UDIV, MVT::i32, Expand);
123 setOperationAction(ISD::SDIV, MVT::i32, Expand);
126 // Expand unsupported conversions
127 setOperationAction(ISD::BITCAST, MVT::f32, Expand);
128 setOperationAction(ISD::BITCAST, MVT::i32, Expand);
131 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
133 // MBlaze doesn't have MUL_LOHI
134 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
135 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
136 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
137 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
139 // Used by legalize types to correctly generate the setcc result.
140 // Without this, every float setcc comes with a AND/OR with the result,
141 // we don't want this, since the fpcmp result goes to a flag register,
142 // which is used implicitly by brcond and select operations.
143 AddPromotedToType(ISD::SETCC, MVT::i1, MVT::i32);
144 AddPromotedToType(ISD::SELECT, MVT::i1, MVT::i32);
145 AddPromotedToType(ISD::SELECT_CC, MVT::i1, MVT::i32);
147 // MBlaze Custom Operations
148 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
149 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
150 setOperationAction(ISD::JumpTable, MVT::i32, Custom);
151 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
153 // Variable Argument support
154 setOperationAction(ISD::VASTART, MVT::Other, Custom);
155 setOperationAction(ISD::VAEND, MVT::Other, Expand);
156 setOperationAction(ISD::VAARG, MVT::Other, Expand);
157 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
160 // Operations not directly supported by MBlaze.
161 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
162 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
163 setOperationAction(ISD::BR_CC, MVT::Other, Expand);
164 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
165 setOperationAction(ISD::ROTL, MVT::i32, Expand);
166 setOperationAction(ISD::ROTR, MVT::i32, Expand);
167 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
168 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
169 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
170 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
171 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand);
172 setOperationAction(ISD::CTTZ, MVT::i32, Expand);
173 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand);
174 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
175 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
177 // We don't have line number support yet.
178 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
180 // Use the default for now
181 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
182 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
184 // MBlaze doesn't have extending float->double load/store
185 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
186 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
188 setMinFunctionAlignment(2);
190 setStackPointerRegisterToSaveRestore(MBlaze::R1);
191 computeRegisterProperties();
194 EVT MBlazeTargetLowering::getSetCCResultType(EVT VT) const {
198 SDValue MBlazeTargetLowering::LowerOperation(SDValue Op,
199 SelectionDAG &DAG) const {
200 switch (Op.getOpcode())
202 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
203 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
204 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
205 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
206 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
207 case ISD::VASTART: return LowerVASTART(Op, DAG);
212 //===----------------------------------------------------------------------===//
213 // Lower helper functions
214 //===----------------------------------------------------------------------===//
216 MBlazeTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
217 MachineBasicBlock *MBB)
219 switch (MI->getOpcode()) {
220 default: llvm_unreachable("Unexpected instr type to insert");
222 case MBlaze::ShiftRL:
223 case MBlaze::ShiftRA:
225 return EmitCustomShift(MI, MBB);
227 case MBlaze::Select_FCC:
228 case MBlaze::Select_CC:
229 return EmitCustomSelect(MI, MBB);
239 return EmitCustomAtomic(MI, MBB);
241 case MBlaze::MEMBARRIER:
242 // The Microblaze does not need memory barriers. Just delete the pseudo
243 // instruction and finish.
244 MI->eraseFromParent();
250 MBlazeTargetLowering::EmitCustomShift(MachineInstr *MI,
251 MachineBasicBlock *MBB) const {
252 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
253 DebugLoc dl = MI->getDebugLoc();
255 // To "insert" a shift left instruction, we actually have to insert a
256 // simple loop. The incoming instruction knows the destination vreg to
257 // set, the source vreg to operate over and the shift amount.
258 const BasicBlock *LLVM_BB = MBB->getBasicBlock();
259 MachineFunction::iterator It = MBB;
263 // andi samt, samt, 31
264 // beqid samt, finish
267 // addik samt, samt, -1
272 MachineFunction *F = MBB->getParent();
273 MachineRegisterInfo &R = F->getRegInfo();
274 MachineBasicBlock *loop = F->CreateMachineBasicBlock(LLVM_BB);
275 MachineBasicBlock *finish = F->CreateMachineBasicBlock(LLVM_BB);
277 F->insert(It, finish);
279 // Update machine-CFG edges by transferring adding all successors and
280 // remaining instructions from the current block to the new block which
281 // will contain the Phi node for the select.
282 finish->splice(finish->begin(), MBB,
283 llvm::next(MachineBasicBlock::iterator(MI)),
285 finish->transferSuccessorsAndUpdatePHIs(MBB);
287 // Add the true and fallthrough blocks as its successors.
288 MBB->addSuccessor(loop);
289 MBB->addSuccessor(finish);
291 // Next, add the finish block as a successor of the loop block
292 loop->addSuccessor(finish);
293 loop->addSuccessor(loop);
295 unsigned IAMT = R.createVirtualRegister(&MBlaze::GPRRegClass);
296 BuildMI(MBB, dl, TII->get(MBlaze::ANDI), IAMT)
297 .addReg(MI->getOperand(2).getReg())
300 unsigned IVAL = R.createVirtualRegister(&MBlaze::GPRRegClass);
301 BuildMI(MBB, dl, TII->get(MBlaze::ADDIK), IVAL)
302 .addReg(MI->getOperand(1).getReg())
305 BuildMI(MBB, dl, TII->get(MBlaze::BEQID))
309 unsigned DST = R.createVirtualRegister(&MBlaze::GPRRegClass);
310 unsigned NDST = R.createVirtualRegister(&MBlaze::GPRRegClass);
311 BuildMI(loop, dl, TII->get(MBlaze::PHI), DST)
312 .addReg(IVAL).addMBB(MBB)
313 .addReg(NDST).addMBB(loop);
315 unsigned SAMT = R.createVirtualRegister(&MBlaze::GPRRegClass);
316 unsigned NAMT = R.createVirtualRegister(&MBlaze::GPRRegClass);
317 BuildMI(loop, dl, TII->get(MBlaze::PHI), SAMT)
318 .addReg(IAMT).addMBB(MBB)
319 .addReg(NAMT).addMBB(loop);
321 if (MI->getOpcode() == MBlaze::ShiftL)
322 BuildMI(loop, dl, TII->get(MBlaze::ADD), NDST).addReg(DST).addReg(DST);
323 else if (MI->getOpcode() == MBlaze::ShiftRA)
324 BuildMI(loop, dl, TII->get(MBlaze::SRA), NDST).addReg(DST);
325 else if (MI->getOpcode() == MBlaze::ShiftRL)
326 BuildMI(loop, dl, TII->get(MBlaze::SRL), NDST).addReg(DST);
328 llvm_unreachable("Cannot lower unknown shift instruction");
330 BuildMI(loop, dl, TII->get(MBlaze::ADDIK), NAMT)
334 BuildMI(loop, dl, TII->get(MBlaze::BNEID))
338 BuildMI(*finish, finish->begin(), dl,
339 TII->get(MBlaze::PHI), MI->getOperand(0).getReg())
340 .addReg(IVAL).addMBB(MBB)
341 .addReg(NDST).addMBB(loop);
343 // The pseudo instruction is no longer needed so remove it
344 MI->eraseFromParent();
349 MBlazeTargetLowering::EmitCustomSelect(MachineInstr *MI,
350 MachineBasicBlock *MBB) const {
351 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
352 DebugLoc dl = MI->getDebugLoc();
354 // To "insert" a SELECT_CC instruction, we actually have to insert the
355 // diamond control-flow pattern. The incoming instruction knows the
356 // destination vreg to set, the condition code register to branch on, the
357 // true/false values to select between, and a branch opcode to use.
358 const BasicBlock *LLVM_BB = MBB->getBasicBlock();
359 MachineFunction::iterator It = MBB;
366 // bNE r1, r0, copy1MBB
367 // fallthrough --> copy0MBB
368 MachineFunction *F = MBB->getParent();
369 MachineBasicBlock *flsBB = F->CreateMachineBasicBlock(LLVM_BB);
370 MachineBasicBlock *dneBB = F->CreateMachineBasicBlock(LLVM_BB);
373 switch (MI->getOperand(4).getImm()) {
374 default: llvm_unreachable("Unknown branch condition");
375 case MBlazeCC::EQ: Opc = MBlaze::BEQID; break;
376 case MBlazeCC::NE: Opc = MBlaze::BNEID; break;
377 case MBlazeCC::GT: Opc = MBlaze::BGTID; break;
378 case MBlazeCC::LT: Opc = MBlaze::BLTID; break;
379 case MBlazeCC::GE: Opc = MBlaze::BGEID; break;
380 case MBlazeCC::LE: Opc = MBlaze::BLEID; break;
383 F->insert(It, flsBB);
384 F->insert(It, dneBB);
386 // Transfer the remainder of MBB and its successor edges to dneBB.
387 dneBB->splice(dneBB->begin(), MBB,
388 llvm::next(MachineBasicBlock::iterator(MI)),
390 dneBB->transferSuccessorsAndUpdatePHIs(MBB);
392 MBB->addSuccessor(flsBB);
393 MBB->addSuccessor(dneBB);
394 flsBB->addSuccessor(dneBB);
396 BuildMI(MBB, dl, TII->get(Opc))
397 .addReg(MI->getOperand(3).getReg())
401 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
403 //BuildMI(dneBB, dl, TII->get(MBlaze::PHI), MI->getOperand(0).getReg())
404 // .addReg(MI->getOperand(1).getReg()).addMBB(flsBB)
405 // .addReg(MI->getOperand(2).getReg()).addMBB(BB);
407 BuildMI(*dneBB, dneBB->begin(), dl,
408 TII->get(MBlaze::PHI), MI->getOperand(0).getReg())
409 .addReg(MI->getOperand(2).getReg()).addMBB(flsBB)
410 .addReg(MI->getOperand(1).getReg()).addMBB(MBB);
412 MI->eraseFromParent(); // The pseudo instruction is gone now.
417 MBlazeTargetLowering::EmitCustomAtomic(MachineInstr *MI,
418 MachineBasicBlock *MBB) const {
419 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
420 DebugLoc dl = MI->getDebugLoc();
422 // All atomic instructions on the Microblaze are implemented using the
423 // load-linked / store-conditional style atomic instruction sequences.
424 // Thus, all operations will look something like the following:
435 // To "insert" a shift left instruction, we actually have to insert a
436 // simple loop. The incoming instruction knows the destination vreg to
437 // set, the source vreg to operate over and the shift amount.
438 const BasicBlock *LLVM_BB = MBB->getBasicBlock();
439 MachineFunction::iterator It = MBB;
443 // andi samt, samt, 31
444 // beqid samt, finish
447 // addik samt, samt, -1
452 MachineFunction *F = MBB->getParent();
453 MachineRegisterInfo &R = F->getRegInfo();
455 // Create the start and exit basic blocks for the atomic operation
456 MachineBasicBlock *start = F->CreateMachineBasicBlock(LLVM_BB);
457 MachineBasicBlock *exit = F->CreateMachineBasicBlock(LLVM_BB);
458 F->insert(It, start);
461 // Update machine-CFG edges by transferring adding all successors and
462 // remaining instructions from the current block to the new block which
463 // will contain the Phi node for the select.
464 exit->splice(exit->begin(), MBB, llvm::next(MachineBasicBlock::iterator(MI)),
466 exit->transferSuccessorsAndUpdatePHIs(MBB);
468 // Add the fallthrough block as its successors.
469 MBB->addSuccessor(start);
471 BuildMI(start, dl, TII->get(MBlaze::LWX), MI->getOperand(0).getReg())
472 .addReg(MI->getOperand(1).getReg())
475 MachineBasicBlock *final = start;
476 unsigned finalReg = 0;
478 switch (MI->getOpcode()) {
479 default: llvm_unreachable("Cannot lower unknown atomic instruction!");
482 finalReg = MI->getOperand(2).getReg();
483 start->addSuccessor(exit);
484 start->addSuccessor(start);
492 case MBlaze::LAA32: {
494 switch (MI->getOpcode()) {
495 default: llvm_unreachable("Cannot lower unknown atomic load!");
496 case MBlaze::LAA32: opcode = MBlaze::ADDIK; break;
497 case MBlaze::LAS32: opcode = MBlaze::RSUBIK; break;
498 case MBlaze::LAD32: opcode = MBlaze::AND; break;
499 case MBlaze::LAO32: opcode = MBlaze::OR; break;
500 case MBlaze::LAX32: opcode = MBlaze::XOR; break;
501 case MBlaze::LAN32: opcode = MBlaze::AND; break;
504 finalReg = R.createVirtualRegister(&MBlaze::GPRRegClass);
505 start->addSuccessor(exit);
506 start->addSuccessor(start);
508 BuildMI(start, dl, TII->get(opcode), finalReg)
509 .addReg(MI->getOperand(0).getReg())
510 .addReg(MI->getOperand(2).getReg());
512 if (MI->getOpcode() == MBlaze::LAN32) {
513 unsigned tmp = finalReg;
514 finalReg = R.createVirtualRegister(&MBlaze::GPRRegClass);
515 BuildMI(start, dl, TII->get(MBlaze::XORI), finalReg)
522 case MBlaze::CAS32: {
523 finalReg = MI->getOperand(3).getReg();
524 final = F->CreateMachineBasicBlock(LLVM_BB);
526 F->insert(It, final);
527 start->addSuccessor(exit);
528 start->addSuccessor(final);
529 final->addSuccessor(exit);
530 final->addSuccessor(start);
532 unsigned CMP = R.createVirtualRegister(&MBlaze::GPRRegClass);
533 BuildMI(start, dl, TII->get(MBlaze::CMP), CMP)
534 .addReg(MI->getOperand(0).getReg())
535 .addReg(MI->getOperand(2).getReg());
537 BuildMI(start, dl, TII->get(MBlaze::BNEID))
541 final->moveAfter(start);
542 exit->moveAfter(final);
547 unsigned CHK = R.createVirtualRegister(&MBlaze::GPRRegClass);
548 BuildMI(final, dl, TII->get(MBlaze::SWX))
550 .addReg(MI->getOperand(1).getReg())
553 BuildMI(final, dl, TII->get(MBlaze::ADDIC), CHK)
557 BuildMI(final, dl, TII->get(MBlaze::BNEID))
561 // The pseudo instruction is no longer needed so remove it
562 MI->eraseFromParent();
566 //===----------------------------------------------------------------------===//
567 // Misc Lower Operation implementation
568 //===----------------------------------------------------------------------===//
571 SDValue MBlazeTargetLowering::LowerSELECT_CC(SDValue Op,
572 SelectionDAG &DAG) const {
573 SDValue LHS = Op.getOperand(0);
574 SDValue RHS = Op.getOperand(1);
575 SDValue TrueVal = Op.getOperand(2);
576 SDValue FalseVal = Op.getOperand(3);
577 DebugLoc dl = Op.getDebugLoc();
581 if (LHS.getValueType() == MVT::i32) {
582 Opc = MBlazeISD::Select_CC;
583 CompareFlag = DAG.getNode(MBlazeISD::ICmp, dl, MVT::i32, LHS, RHS)
586 llvm_unreachable("Cannot lower select_cc with unknown type");
589 return DAG.getNode(Opc, dl, TrueVal.getValueType(), TrueVal, FalseVal,
593 SDValue MBlazeTargetLowering::
594 LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const {
595 // FIXME there isn't actually debug info here
596 DebugLoc dl = Op.getDebugLoc();
597 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
598 SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i32);
600 return DAG.getNode(MBlazeISD::Wrap, dl, MVT::i32, GA);
603 SDValue MBlazeTargetLowering::
604 LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
605 llvm_unreachable("TLS not implemented for MicroBlaze.");
608 SDValue MBlazeTargetLowering::
609 LowerJumpTable(SDValue Op, SelectionDAG &DAG) const {
612 // FIXME there isn't actually debug info here
613 DebugLoc dl = Op.getDebugLoc();
615 EVT PtrVT = Op.getValueType();
616 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
618 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, 0);
619 return DAG.getNode(MBlazeISD::Wrap, dl, MVT::i32, JTI);
622 SDValue MBlazeTargetLowering::
623 LowerConstantPool(SDValue Op, SelectionDAG &DAG) const {
625 ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
626 const Constant *C = N->getConstVal();
627 DebugLoc dl = Op.getDebugLoc();
629 SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
631 return DAG.getNode(MBlazeISD::Wrap, dl, MVT::i32, CP);
634 SDValue MBlazeTargetLowering::LowerVASTART(SDValue Op,
635 SelectionDAG &DAG) const {
636 MachineFunction &MF = DAG.getMachineFunction();
637 MBlazeFunctionInfo *FuncInfo = MF.getInfo<MBlazeFunctionInfo>();
639 DebugLoc dl = Op.getDebugLoc();
640 SDValue FI = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(),
643 // vastart just stores the address of the VarArgsFrameIndex slot into the
644 // memory location argument.
645 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
646 return DAG.getStore(Op.getOperand(0), dl, FI, Op.getOperand(1),
647 MachinePointerInfo(SV),
651 //===----------------------------------------------------------------------===//
652 // Calling Convention Implementation
653 //===----------------------------------------------------------------------===//
655 #include "MBlazeGenCallingConv.inc"
657 static bool CC_MBlaze_AssignReg(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
658 CCValAssign::LocInfo &LocInfo,
659 ISD::ArgFlagsTy &ArgFlags,
661 static const uint16_t ArgRegs[] = {
662 MBlaze::R5, MBlaze::R6, MBlaze::R7,
663 MBlaze::R8, MBlaze::R9, MBlaze::R10
666 const unsigned NumArgRegs = array_lengthof(ArgRegs);
667 unsigned Reg = State.AllocateReg(ArgRegs, NumArgRegs);
668 if (!Reg) return false;
670 unsigned SizeInBytes = ValVT.getSizeInBits() >> 3;
671 State.AllocateStack(SizeInBytes, SizeInBytes);
672 State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
677 //===----------------------------------------------------------------------===//
678 // Call Calling Convention Implementation
679 //===----------------------------------------------------------------------===//
681 /// LowerCall - functions arguments are copied from virtual regs to
682 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
683 /// TODO: isVarArg, isTailCall.
684 SDValue MBlazeTargetLowering::
685 LowerCall(TargetLowering::CallLoweringInfo &CLI,
686 SmallVectorImpl<SDValue> &InVals) const {
687 SelectionDAG &DAG = CLI.DAG;
688 DebugLoc &dl = CLI.DL;
689 SmallVector<ISD::OutputArg, 32> &Outs = CLI.Outs;
690 SmallVector<SDValue, 32> &OutVals = CLI.OutVals;
691 SmallVector<ISD::InputArg, 32> &Ins = CLI.Ins;
692 SDValue Chain = CLI.Chain;
693 SDValue Callee = CLI.Callee;
694 bool &isTailCall = CLI.IsTailCall;
695 CallingConv::ID CallConv = CLI.CallConv;
696 bool isVarArg = CLI.IsVarArg;
698 // MBlaze does not yet support tail call optimization
701 // The MBlaze requires stack slots for arguments passed to var arg
702 // functions even if they are passed in registers.
703 bool needsRegArgSlots = isVarArg;
705 MachineFunction &MF = DAG.getMachineFunction();
706 MachineFrameInfo *MFI = MF.getFrameInfo();
707 const TargetFrameLowering &TFI = *MF.getTarget().getFrameLowering();
709 // Analyze operands of the call, assigning locations to each operand.
710 SmallVector<CCValAssign, 16> ArgLocs;
711 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
712 getTargetMachine(), ArgLocs, *DAG.getContext());
713 CCInfo.AnalyzeCallOperands(Outs, CC_MBlaze);
715 // Get a count of how many bytes are to be pushed on the stack.
716 unsigned NumBytes = CCInfo.getNextStackOffset();
718 // Variable argument function calls require a minimum of 24-bytes of stack
719 if (isVarArg && NumBytes < 24) NumBytes = 24;
721 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
723 SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
724 SmallVector<SDValue, 8> MemOpChains;
726 // Walk the register/memloc assignments, inserting copies/loads.
727 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
728 CCValAssign &VA = ArgLocs[i];
729 MVT RegVT = VA.getLocVT();
730 SDValue Arg = OutVals[i];
732 // Promote the value if needed.
733 switch (VA.getLocInfo()) {
734 default: llvm_unreachable("Unknown loc info!");
735 case CCValAssign::Full: break;
736 case CCValAssign::SExt:
737 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, RegVT, Arg);
739 case CCValAssign::ZExt:
740 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, RegVT, Arg);
742 case CCValAssign::AExt:
743 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, RegVT, Arg);
747 // Arguments that can be passed on register must be kept at
750 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
752 // Register can't get to this point...
753 assert(VA.isMemLoc());
755 // Since we are alread passing values on the stack we don't
756 // need to worry about creating additional slots for the
757 // values passed via registers.
758 needsRegArgSlots = false;
760 // Create the frame index object for this incoming parameter
761 unsigned ArgSize = VA.getValVT().getSizeInBits()/8;
762 unsigned StackLoc = VA.getLocMemOffset() + 4;
763 int FI = MFI->CreateFixedObject(ArgSize, StackLoc, true);
765 SDValue PtrOff = DAG.getFrameIndex(FI,getPointerTy());
767 // emit ISD::STORE whichs stores the
768 // parameter value to a stack Location
769 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
770 MachinePointerInfo(),
775 // If we need to reserve stack space for the arguments passed via registers
776 // then create a fixed stack object at the beginning of the stack.
777 if (needsRegArgSlots && TFI.hasReservedCallFrame(MF))
778 MFI->CreateFixedObject(28,0,true);
780 // Transform all store nodes into one single node because all store
781 // nodes are independent of each other.
782 if (!MemOpChains.empty())
783 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
784 &MemOpChains[0], MemOpChains.size());
786 // Build a sequence of copy-to-reg nodes chained together with token
787 // chain and flag operands which copy the outgoing args into registers.
788 // The InFlag in necessary since all emitted instructions must be
791 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
792 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
793 RegsToPass[i].second, InFlag);
794 InFlag = Chain.getValue(1);
797 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
798 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
799 // node so that legalize doesn't hack it.
800 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
801 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
802 getPointerTy(), 0, 0);
803 else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
804 Callee = DAG.getTargetExternalSymbol(S->getSymbol(),
807 // MBlazeJmpLink = #chain, #target_address, #opt_in_flags...
808 // = Chain, Callee, Reg#1, Reg#2, ...
810 // Returns a chain & a flag for retval copy to use.
811 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
812 SmallVector<SDValue, 8> Ops;
813 Ops.push_back(Chain);
814 Ops.push_back(Callee);
816 // Add argument registers to the end of the list so that they are
817 // known live into the call.
818 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
819 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
820 RegsToPass[i].second.getValueType()));
823 if (InFlag.getNode())
824 Ops.push_back(InFlag);
826 Chain = DAG.getNode(MBlazeISD::JmpLink, dl, NodeTys, &Ops[0], Ops.size());
827 InFlag = Chain.getValue(1);
829 // Create the CALLSEQ_END node.
830 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
831 DAG.getIntPtrConstant(0, true), InFlag);
833 InFlag = Chain.getValue(1);
835 // Handle result values, copying them out of physregs into vregs that we
837 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
838 Ins, dl, DAG, InVals);
841 /// LowerCallResult - Lower the result values of a call into the
842 /// appropriate copies out of appropriate physical registers.
843 SDValue MBlazeTargetLowering::
844 LowerCallResult(SDValue Chain, SDValue InFlag, CallingConv::ID CallConv,
845 bool isVarArg, const SmallVectorImpl<ISD::InputArg> &Ins,
846 DebugLoc dl, SelectionDAG &DAG,
847 SmallVectorImpl<SDValue> &InVals) const {
848 // Assign locations to each value returned by this call.
849 SmallVector<CCValAssign, 16> RVLocs;
850 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
851 getTargetMachine(), RVLocs, *DAG.getContext());
853 CCInfo.AnalyzeCallResult(Ins, RetCC_MBlaze);
855 // Copy all of the result registers out of their specified physreg.
856 for (unsigned i = 0; i != RVLocs.size(); ++i) {
857 Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(),
858 RVLocs[i].getValVT(), InFlag).getValue(1);
859 InFlag = Chain.getValue(2);
860 InVals.push_back(Chain.getValue(0));
866 //===----------------------------------------------------------------------===//
867 // Formal Arguments Calling Convention Implementation
868 //===----------------------------------------------------------------------===//
870 /// LowerFormalArguments - transform physical registers into
871 /// virtual registers and generate load operations for
872 /// arguments places on the stack.
873 SDValue MBlazeTargetLowering::
874 LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
875 const SmallVectorImpl<ISD::InputArg> &Ins,
876 DebugLoc dl, SelectionDAG &DAG,
877 SmallVectorImpl<SDValue> &InVals) const {
878 MachineFunction &MF = DAG.getMachineFunction();
879 MachineFrameInfo *MFI = MF.getFrameInfo();
880 MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>();
882 unsigned StackReg = MF.getTarget().getRegisterInfo()->getFrameRegister(MF);
883 MBlazeFI->setVarArgsFrameIndex(0);
885 // Used with vargs to acumulate store chains.
886 std::vector<SDValue> OutChains;
888 // Keep track of the last register used for arguments
889 unsigned ArgRegEnd = 0;
891 // Assign locations to all of the incoming arguments.
892 SmallVector<CCValAssign, 16> ArgLocs;
893 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
894 getTargetMachine(), ArgLocs, *DAG.getContext());
896 CCInfo.AnalyzeFormalArguments(Ins, CC_MBlaze);
899 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
900 CCValAssign &VA = ArgLocs[i];
902 // Arguments stored on registers
904 MVT RegVT = VA.getLocVT();
905 ArgRegEnd = VA.getLocReg();
906 const TargetRegisterClass *RC;
908 if (RegVT == MVT::i32)
909 RC = &MBlaze::GPRRegClass;
910 else if (RegVT == MVT::f32)
911 RC = &MBlaze::GPRRegClass;
913 llvm_unreachable("RegVT not supported by LowerFormalArguments");
915 // Transform the arguments stored on
916 // physical registers into virtual ones
917 unsigned Reg = MF.addLiveIn(ArgRegEnd, RC);
918 SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
920 // If this is an 8 or 16-bit value, it has been passed promoted
921 // to 32 bits. Insert an assert[sz]ext to capture this, then
922 // truncate to the right size. If if is a floating point value
923 // then convert to the correct type.
924 if (VA.getLocInfo() != CCValAssign::Full) {
926 if (VA.getLocInfo() == CCValAssign::SExt)
927 Opcode = ISD::AssertSext;
928 else if (VA.getLocInfo() == CCValAssign::ZExt)
929 Opcode = ISD::AssertZext;
931 ArgValue = DAG.getNode(Opcode, dl, RegVT, ArgValue,
932 DAG.getValueType(VA.getValVT()));
933 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
936 InVals.push_back(ArgValue);
937 } else { // VA.isRegLoc()
939 assert(VA.isMemLoc());
941 // The last argument is not a register
944 // The stack pointer offset is relative to the caller stack frame.
945 // Since the real stack size is unknown here, a negative SPOffset
946 // is used so there's a way to adjust these offsets when the stack
947 // size get known (on EliminateFrameIndex). A dummy SPOffset is
948 // used instead of a direct negative address (which is recorded to
949 // be used on emitPrologue) to avoid mis-calc of the first stack
950 // offset on PEI::calculateFrameObjectOffsets.
951 // Arguments are always 32-bit.
952 unsigned ArgSize = VA.getLocVT().getSizeInBits()/8;
953 unsigned StackLoc = VA.getLocMemOffset() + 4;
954 int FI = MFI->CreateFixedObject(ArgSize, 0, true);
955 MBlazeFI->recordLoadArgsFI(FI, -StackLoc);
956 MBlazeFI->recordLiveIn(FI);
958 // Create load nodes to retrieve arguments from the stack
959 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
960 InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
961 MachinePointerInfo::getFixedStack(FI),
962 false, false, false, 0));
966 // To meet ABI, when VARARGS are passed on registers, the registers
967 // must have their values written to the caller stack frame. If the last
968 // argument was placed in the stack, there's no need to save any register.
969 if ((isVarArg) && ArgRegEnd) {
970 if (StackPtr.getNode() == 0)
971 StackPtr = DAG.getRegister(StackReg, getPointerTy());
973 // The last register argument that must be saved is MBlaze::R10
974 const TargetRegisterClass *RC = &MBlaze::GPRRegClass;
976 unsigned Begin = getMBlazeRegisterNumbering(MBlaze::R5);
977 unsigned Start = getMBlazeRegisterNumbering(ArgRegEnd+1);
978 unsigned End = getMBlazeRegisterNumbering(MBlaze::R10);
979 unsigned StackLoc = Start - Begin + 1;
981 for (; Start <= End; ++Start, ++StackLoc) {
982 unsigned Reg = getMBlazeRegisterFromNumbering(Start);
983 unsigned LiveReg = MF.addLiveIn(Reg, RC);
984 SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, LiveReg, MVT::i32);
986 int FI = MFI->CreateFixedObject(4, 0, true);
987 MBlazeFI->recordStoreVarArgsFI(FI, -(StackLoc*4));
988 SDValue PtrOff = DAG.getFrameIndex(FI, getPointerTy());
989 OutChains.push_back(DAG.getStore(Chain, dl, ArgValue, PtrOff,
990 MachinePointerInfo(),
993 // Record the frame index of the first variable argument
994 // which is a value necessary to VASTART.
995 if (!MBlazeFI->getVarArgsFrameIndex())
996 MBlazeFI->setVarArgsFrameIndex(FI);
1000 // All stores are grouped in one node to allow the matching between
1001 // the size of Ins and InVals. This only happens when on varg functions
1002 if (!OutChains.empty()) {
1003 OutChains.push_back(Chain);
1004 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1005 &OutChains[0], OutChains.size());
1011 //===----------------------------------------------------------------------===//
1012 // Return Value Calling Convention Implementation
1013 //===----------------------------------------------------------------------===//
1015 SDValue MBlazeTargetLowering::
1016 LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
1017 const SmallVectorImpl<ISD::OutputArg> &Outs,
1018 const SmallVectorImpl<SDValue> &OutVals,
1019 DebugLoc dl, SelectionDAG &DAG) const {
1020 // CCValAssign - represent the assignment of
1021 // the return value to a location
1022 SmallVector<CCValAssign, 16> RVLocs;
1024 // CCState - Info about the registers and stack slot.
1025 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1026 getTargetMachine(), RVLocs, *DAG.getContext());
1028 // Analize return values.
1029 CCInfo.AnalyzeReturn(Outs, RetCC_MBlaze);
1032 SmallVector<SDValue, 4> RetOps(1, Chain);
1034 // If this function is using the interrupt_handler calling convention
1035 // then use "rtid r14, 0" otherwise use "rtsd r15, 8"
1036 unsigned Ret = (CallConv == CallingConv::MBLAZE_INTR) ? MBlazeISD::IRet
1038 unsigned Reg = (CallConv == CallingConv::MBLAZE_INTR) ? MBlaze::R14
1040 RetOps.push_back(DAG.getRegister(Reg, MVT::i32));
1043 // Copy the result values into the output registers.
1044 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1045 CCValAssign &VA = RVLocs[i];
1046 assert(VA.isRegLoc() && "Can only return in registers!");
1048 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1051 // guarantee that all emitted copies are
1052 // stuck together, avoiding something bad
1053 Flag = Chain.getValue(1);
1054 RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
1057 RetOps[0] = Chain; // Update chain.
1059 // Add the flag if we have it.
1061 RetOps.push_back(Flag);
1063 return DAG.getNode(Ret, dl, MVT::Other, &RetOps[0], RetOps.size());
1066 //===----------------------------------------------------------------------===//
1067 // MBlaze Inline Assembly Support
1068 //===----------------------------------------------------------------------===//
1070 /// getConstraintType - Given a constraint letter, return the type of
1071 /// constraint it is for this target.
1072 MBlazeTargetLowering::ConstraintType MBlazeTargetLowering::
1073 getConstraintType(const std::string &Constraint) const
1075 // MBlaze specific constrainy
1077 // 'd' : An address register. Equivalent to r.
1078 // 'y' : Equivalent to r; retained for
1079 // backwards compatibility.
1080 // 'f' : Floating Point registers.
1081 if (Constraint.size() == 1) {
1082 switch (Constraint[0]) {
1087 return C_RegisterClass;
1090 return TargetLowering::getConstraintType(Constraint);
1093 /// Examine constraint type and operand type and determine a weight value.
1094 /// This object must already have been set up with the operand type
1095 /// and the current alternative constraint selected.
1096 TargetLowering::ConstraintWeight
1097 MBlazeTargetLowering::getSingleConstraintMatchWeight(
1098 AsmOperandInfo &info, const char *constraint) const {
1099 ConstraintWeight weight = CW_Invalid;
1100 Value *CallOperandVal = info.CallOperandVal;
1101 // If we don't have a value, we can't do a match,
1102 // but allow it at the lowest weight.
1103 if (CallOperandVal == NULL)
1105 Type *type = CallOperandVal->getType();
1106 // Look at the constraint type.
1107 switch (*constraint) {
1109 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
1113 if (type->isIntegerTy())
1114 weight = CW_Register;
1117 if (type->isFloatTy())
1118 weight = CW_Register;
1124 /// Given a register class constraint, like 'r', if this corresponds directly
1125 /// to an LLVM register class, return a register of 0 and the register class
1127 std::pair<unsigned, const TargetRegisterClass*> MBlazeTargetLowering::
1128 getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const {
1129 if (Constraint.size() == 1) {
1130 switch (Constraint[0]) {
1132 return std::make_pair(0U, &MBlaze::GPRRegClass);
1133 // TODO: These can't possibly be right, but match what was in
1134 // getRegClassForInlineAsmConstraint.
1139 return std::make_pair(0U, &MBlaze::GPRRegClass);
1142 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
1145 bool MBlazeTargetLowering::
1146 isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
1147 // The MBlaze target isn't yet aware of offsets.
1151 bool MBlazeTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
1152 return VT != MVT::f32;