1 //===-- PPCISelDAGToDAG.cpp - PPC --pattern matching inst selector --------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines a pattern matching instruction selector for PowerPC,
11 // converting from a legalized dag to a PPC dag.
13 //===----------------------------------------------------------------------===//
16 #include "PPCTargetMachine.h"
17 #include "PPCISelLowering.h"
18 #include "llvm/CodeGen/MachineInstrBuilder.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/SSARegMap.h"
21 #include "llvm/CodeGen/SelectionDAG.h"
22 #include "llvm/CodeGen/SelectionDAGISel.h"
23 #include "llvm/Target/TargetOptions.h"
24 #include "llvm/ADT/Statistic.h"
25 #include "llvm/Constants.h"
26 #include "llvm/GlobalValue.h"
27 #include "llvm/Support/Debug.h"
28 #include "llvm/Support/MathExtras.h"
32 Statistic<> FusedFP ("ppc-codegen", "Number of fused fp operations");
33 Statistic<> FrameOff("ppc-codegen", "Number of frame idx offsets collapsed");
35 //===--------------------------------------------------------------------===//
36 /// PPCDAGToDAGISel - PPC specific code to select PPC machine
37 /// instructions for SelectionDAG operations.
39 class PPCDAGToDAGISel : public SelectionDAGISel {
40 PPCTargetLowering PPCLowering;
41 unsigned GlobalBaseReg;
43 PPCDAGToDAGISel(TargetMachine &TM)
44 : SelectionDAGISel(PPCLowering), PPCLowering(TM) {}
46 virtual bool runOnFunction(Function &Fn) {
47 // Make sure we re-emit a set of the global base reg if necessary
49 return SelectionDAGISel::runOnFunction(Fn);
52 /// getI32Imm - Return a target constant with the specified value, of type
54 inline SDOperand getI32Imm(unsigned Imm) {
55 return CurDAG->getTargetConstant(Imm, MVT::i32);
58 /// getGlobalBaseReg - insert code into the entry mbb to materialize the PIC
59 /// base register. Return the virtual register that holds this value.
60 SDOperand getGlobalBaseReg();
62 // Select - Convert the specified operand from a target-independent to a
63 // target-specific node if it hasn't already been changed.
64 SDOperand Select(SDOperand Op);
66 SDNode *SelectBitfieldInsert(SDNode *N);
68 /// SelectCC - Select a comparison of the specified values with the
69 /// specified condition code, returning the CR# of the expression.
70 SDOperand SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC);
72 /// SelectAddr - Given the specified address, return the two operands for a
73 /// load/store instruction, and return true if it should be an indexed [r+r]
75 bool SelectAddr(SDOperand Addr, SDOperand &Op1, SDOperand &Op2);
77 SDOperand BuildSDIVSequence(SDNode *N);
78 SDOperand BuildUDIVSequence(SDNode *N);
80 /// InstructionSelectBasicBlock - This callback is invoked by
81 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
82 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
84 virtual const char *getPassName() const {
85 return "PowerPC DAG->DAG Pattern Instruction Selection";
88 // Include the pieces autogenerated from the target description.
89 #include "PPCGenDAGISel.inc"
92 SDOperand SelectDYNAMIC_STACKALLOC(SDOperand Op);
93 SDOperand SelectADD_PARTS(SDOperand Op);
94 SDOperand SelectSUB_PARTS(SDOperand Op);
95 SDOperand SelectSETCC(SDOperand Op);
96 SDOperand SelectCALL(SDOperand Op);
100 /// InstructionSelectBasicBlock - This callback is invoked by
101 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
102 void PPCDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
105 // The selection process is inherently a bottom-up recursive process (users
106 // select their uses before themselves). Given infinite stack space, we
107 // could just start selecting on the root and traverse the whole graph. In
108 // practice however, this causes us to run out of stack space on large basic
109 // blocks. To avoid this problem, select the entry node, then all its uses,
110 // iteratively instead of recursively.
111 std::vector<SDOperand> Worklist;
112 Worklist.push_back(DAG.getEntryNode());
114 // Note that we can do this in the PPC target (scanning forward across token
115 // chain edges) because no nodes ever get folded across these edges. On a
116 // target like X86 which supports load/modify/store operations, this would
117 // have to be more careful.
118 while (!Worklist.empty()) {
119 SDOperand Node = Worklist.back();
122 // Chose from the least deep of the top two nodes.
123 if (!Worklist.empty() &&
124 Worklist.back().Val->getNodeDepth() < Node.Val->getNodeDepth())
125 std::swap(Worklist.back(), Node);
127 if ((Node.Val->getOpcode() >= ISD::BUILTIN_OP_END &&
128 Node.Val->getOpcode() < PPCISD::FIRST_NUMBER) ||
129 CodeGenMap.count(Node)) continue;
131 for (SDNode::use_iterator UI = Node.Val->use_begin(),
132 E = Node.Val->use_end(); UI != E; ++UI) {
133 // Scan the values. If this use has a value that is a token chain, add it
136 for (unsigned i = 0, e = User->getNumValues(); i != e; ++i)
137 if (User->getValueType(i) == MVT::Other) {
138 Worklist.push_back(SDOperand(User, i));
143 // Finally, legalize this node.
147 // Select target instructions for the DAG.
148 DAG.setRoot(Select(DAG.getRoot()));
150 DAG.RemoveDeadNodes();
152 // Emit machine code to BB.
153 ScheduleAndEmitDAG(DAG);
156 /// getGlobalBaseReg - Output the instructions required to put the
157 /// base address to use for accessing globals into a register.
159 SDOperand PPCDAGToDAGISel::getGlobalBaseReg() {
160 if (!GlobalBaseReg) {
161 // Insert the set of GlobalBaseReg into the first MBB of the function
162 MachineBasicBlock &FirstMBB = BB->getParent()->front();
163 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
164 SSARegMap *RegMap = BB->getParent()->getSSARegMap();
165 // FIXME: when we get to LP64, we will need to create the appropriate
166 // type of register here.
167 GlobalBaseReg = RegMap->createVirtualRegister(PPC::GPRCRegisterClass);
168 BuildMI(FirstMBB, MBBI, PPC::MovePCtoLR, 0, PPC::LR);
169 BuildMI(FirstMBB, MBBI, PPC::MFLR, 1, GlobalBaseReg);
171 return CurDAG->getRegister(GlobalBaseReg, MVT::i32);
175 // isIntImmediate - This method tests to see if a constant operand.
176 // If so Imm will receive the 32 bit value.
177 static bool isIntImmediate(SDNode *N, unsigned& Imm) {
178 if (N->getOpcode() == ISD::Constant) {
179 Imm = cast<ConstantSDNode>(N)->getValue();
185 // isOprShiftImm - Returns true if the specified operand is a shift opcode with
186 // a immediate shift count less than 32.
187 static bool isOprShiftImm(SDNode *N, unsigned& Opc, unsigned& SH) {
188 Opc = N->getOpcode();
189 return (Opc == ISD::SHL || Opc == ISD::SRL || Opc == ISD::SRA) &&
190 isIntImmediate(N->getOperand(1).Val, SH) && SH < 32;
193 // isRunOfOnes - Returns true iff Val consists of one contiguous run of 1s with
194 // any number of 0s on either side. The 1s are allowed to wrap from LSB to
195 // MSB, so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs. 0x0F0F0000 is
196 // not, since all 1s are not contiguous.
197 static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
198 if (isShiftedMask_32(Val)) {
199 // look for the first non-zero bit
200 MB = CountLeadingZeros_32(Val);
201 // look for the first zero bit after the run of ones
202 ME = CountLeadingZeros_32((Val - 1) ^ Val);
205 Val = ~Val; // invert mask
206 if (isShiftedMask_32(Val)) {
207 // effectively look for the first zero bit
208 ME = CountLeadingZeros_32(Val) - 1;
209 // effectively look for the first one bit after the run of zeros
210 MB = CountLeadingZeros_32((Val - 1) ^ Val) + 1;
218 // isRotateAndMask - Returns true if Mask and Shift can be folded into a rotate
219 // and mask opcode and mask operation.
220 static bool isRotateAndMask(SDNode *N, unsigned Mask, bool IsShiftMask,
221 unsigned &SH, unsigned &MB, unsigned &ME) {
222 // Don't even go down this path for i64, since different logic will be
223 // necessary for rldicl/rldicr/rldimi.
224 if (N->getValueType(0) != MVT::i32)
228 unsigned Indeterminant = ~0; // bit mask marking indeterminant results
229 unsigned Opcode = N->getOpcode();
230 if (N->getNumOperands() != 2 ||
231 !isIntImmediate(N->getOperand(1).Val, Shift) || (Shift > 31))
234 if (Opcode == ISD::SHL) {
235 // apply shift left to mask if it comes first
236 if (IsShiftMask) Mask = Mask << Shift;
237 // determine which bits are made indeterminant by shift
238 Indeterminant = ~(0xFFFFFFFFu << Shift);
239 } else if (Opcode == ISD::SRL) {
240 // apply shift right to mask if it comes first
241 if (IsShiftMask) Mask = Mask >> Shift;
242 // determine which bits are made indeterminant by shift
243 Indeterminant = ~(0xFFFFFFFFu >> Shift);
244 // adjust for the left rotate
250 // if the mask doesn't intersect any Indeterminant bits
251 if (Mask && !(Mask & Indeterminant)) {
253 // make sure the mask is still a mask (wrap arounds may not be)
254 return isRunOfOnes(Mask, MB, ME);
259 // isOpcWithIntImmediate - This method tests to see if the node is a specific
260 // opcode and that it has a immediate integer right operand.
261 // If so Imm will receive the 32 bit value.
262 static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) {
263 return N->getOpcode() == Opc && isIntImmediate(N->getOperand(1).Val, Imm);
266 // isOprNot - Returns true if the specified operand is an xor with immediate -1.
267 static bool isOprNot(SDNode *N) {
269 return isOpcWithIntImmediate(N, ISD::XOR, Imm) && (signed)Imm == -1;
272 // Immediate constant composers.
273 // Lo16 - grabs the lo 16 bits from a 32 bit constant.
274 // Hi16 - grabs the hi 16 bits from a 32 bit constant.
275 // HA16 - computes the hi bits required if the lo bits are add/subtracted in
277 static unsigned Lo16(unsigned x) { return x & 0x0000FFFF; }
278 static unsigned Hi16(unsigned x) { return Lo16(x >> 16); }
279 static unsigned HA16(unsigned x) { return Hi16((signed)x - (signed short)x); }
281 // isIntImmediate - This method tests to see if a constant operand.
282 // If so Imm will receive the 32 bit value.
283 static bool isIntImmediate(SDOperand N, unsigned& Imm) {
284 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
285 Imm = (unsigned)CN->getSignExtended();
291 /// SelectBitfieldInsert - turn an or of two masked values into
292 /// the rotate left word immediate then mask insert (rlwimi) instruction.
293 /// Returns true on success, false if the caller still needs to select OR.
295 /// Patterns matched:
296 /// 1. or shl, and 5. or and, and
297 /// 2. or and, shl 6. or shl, shr
298 /// 3. or shr, and 7. or shr, shl
300 SDNode *PPCDAGToDAGISel::SelectBitfieldInsert(SDNode *N) {
301 bool IsRotate = false;
302 unsigned TgtMask = 0xFFFFFFFF, InsMask = 0xFFFFFFFF, SH = 0;
305 SDOperand Op0 = N->getOperand(0);
306 SDOperand Op1 = N->getOperand(1);
308 unsigned Op0Opc = Op0.getOpcode();
309 unsigned Op1Opc = Op1.getOpcode();
311 // Verify that we have the correct opcodes
312 if (ISD::SHL != Op0Opc && ISD::SRL != Op0Opc && ISD::AND != Op0Opc)
314 if (ISD::SHL != Op1Opc && ISD::SRL != Op1Opc && ISD::AND != Op1Opc)
317 // Generate Mask value for Target
318 if (isIntImmediate(Op0.getOperand(1), Value)) {
320 case ISD::SHL: TgtMask <<= Value; break;
321 case ISD::SRL: TgtMask >>= Value; break;
322 case ISD::AND: TgtMask &= Value; break;
328 // Generate Mask value for Insert
329 if (!isIntImmediate(Op1.getOperand(1), Value))
336 if (Op0Opc == ISD::SRL) IsRotate = true;
342 if (Op0Opc == ISD::SHL) IsRotate = true;
349 // If both of the inputs are ANDs and one of them has a logical shift by
350 // constant as its input, make that AND the inserted value so that we can
351 // combine the shift into the rotate part of the rlwimi instruction
352 bool IsAndWithShiftOp = false;
353 if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) {
354 if (Op1.getOperand(0).getOpcode() == ISD::SHL ||
355 Op1.getOperand(0).getOpcode() == ISD::SRL) {
356 if (isIntImmediate(Op1.getOperand(0).getOperand(1), Value)) {
357 SH = Op1.getOperand(0).getOpcode() == ISD::SHL ? Value : 32 - Value;
358 IsAndWithShiftOp = true;
360 } else if (Op0.getOperand(0).getOpcode() == ISD::SHL ||
361 Op0.getOperand(0).getOpcode() == ISD::SRL) {
362 if (isIntImmediate(Op0.getOperand(0).getOperand(1), Value)) {
364 std::swap(TgtMask, InsMask);
365 SH = Op1.getOperand(0).getOpcode() == ISD::SHL ? Value : 32 - Value;
366 IsAndWithShiftOp = true;
371 // Verify that the Target mask and Insert mask together form a full word mask
372 // and that the Insert mask is a run of set bits (which implies both are runs
373 // of set bits). Given that, Select the arguments and generate the rlwimi
376 if (((TgtMask & InsMask) == 0) && isRunOfOnes(InsMask, MB, ME)) {
377 bool fullMask = (TgtMask ^ InsMask) == 0xFFFFFFFF;
378 bool Op0IsAND = Op0Opc == ISD::AND;
379 // Check for rotlwi / rotrwi here, a special case of bitfield insert
380 // where both bitfield halves are sourced from the same value.
381 if (IsRotate && fullMask &&
382 N->getOperand(0).getOperand(0) == N->getOperand(1).getOperand(0)) {
383 Op0 = CurDAG->getTargetNode(PPC::RLWINM, MVT::i32,
384 Select(N->getOperand(0).getOperand(0)),
385 getI32Imm(SH), getI32Imm(0), getI32Imm(31));
388 SDOperand Tmp1 = (Op0IsAND && fullMask) ? Select(Op0.getOperand(0))
390 SDOperand Tmp2 = IsAndWithShiftOp ? Select(Op1.getOperand(0).getOperand(0))
391 : Select(Op1.getOperand(0));
392 Op0 = CurDAG->getTargetNode(PPC::RLWIMI, MVT::i32, Tmp1, Tmp2,
393 getI32Imm(SH), getI32Imm(MB), getI32Imm(ME));
399 /// SelectAddr - Given the specified address, return the two operands for a
400 /// load/store instruction, and return true if it should be an indexed [r+r]
402 bool PPCDAGToDAGISel::SelectAddr(SDOperand Addr, SDOperand &Op1,
405 if (Addr.getOpcode() == ISD::ADD) {
406 if (isIntImmediate(Addr.getOperand(1), imm) && isInt16(imm)) {
407 Op1 = getI32Imm(Lo16(imm));
408 if (FrameIndexSDNode *FI =
409 dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
411 Op2 = CurDAG->getTargetFrameIndex(FI->getIndex(), MVT::i32);
413 Op2 = Select(Addr.getOperand(0));
416 } else if (Addr.getOperand(1).getOpcode() == PPCISD::Lo) {
417 // Match LOAD (ADD (X, Lo(G))).
418 assert(!cast<ConstantSDNode>(Addr.getOperand(1).getOperand(1))->getValue()
419 && "Cannot handle constant offsets yet!");
420 Op1 = Addr.getOperand(1).getOperand(0); // The global address.
421 assert(Op1.getOpcode() == ISD::TargetGlobalAddress);
422 Op2 = Select(Addr.getOperand(0));
423 return false; // [&g+r]
425 Op1 = Select(Addr.getOperand(0));
426 Op2 = Select(Addr.getOperand(1));
427 return true; // [r+r]
431 // Now check if we're dealing with a global, and whether or not we should emit
432 // an optimized load or store for statics.
433 if (GlobalAddressSDNode *GN = dyn_cast<GlobalAddressSDNode>(Addr)) {
434 GlobalValue *GV = GN->getGlobal();
435 if (!GV->hasWeakLinkage() && !GV->isExternal()) {
436 Op1 = CurDAG->getTargetGlobalAddress(GV, MVT::i32);
438 Op2 = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(),
441 Op2 = CurDAG->getTargetNode(PPC::LIS, MVT::i32, Op1);
444 } else if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Addr)) {
446 Op2 = CurDAG->getTargetFrameIndex(FI->getIndex(), MVT::i32);
448 } else if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Addr)) {
451 Op2 = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(),Op1);
453 Op2 = CurDAG->getTargetNode(PPC::LIS, MVT::i32, Op1);
461 /// SelectCC - Select a comparison of the specified values with the specified
462 /// condition code, returning the CR# of the expression.
463 SDOperand PPCDAGToDAGISel::SelectCC(SDOperand LHS, SDOperand RHS,
465 // Always select the LHS.
468 // Use U to determine whether the SETCC immediate range is signed or not.
469 if (MVT::isInteger(LHS.getValueType())) {
470 bool U = ISD::isUnsignedIntSetCC(CC);
472 if (isIntImmediate(RHS, Imm) &&
473 ((U && isUInt16(Imm)) || (!U && isInt16(Imm))))
474 return CurDAG->getTargetNode(U ? PPC::CMPLWI : PPC::CMPWI, MVT::i32,
475 LHS, getI32Imm(Lo16(Imm)));
476 return CurDAG->getTargetNode(U ? PPC::CMPLW : PPC::CMPW, MVT::i32,
478 } else if (LHS.getValueType() == MVT::f32) {
479 return CurDAG->getTargetNode(PPC::FCMPUS, MVT::i32, LHS, Select(RHS));
481 return CurDAG->getTargetNode(PPC::FCMPUD, MVT::i32, LHS, Select(RHS));
485 /// getBCCForSetCC - Returns the PowerPC condition branch mnemonic corresponding
487 static unsigned getBCCForSetCC(ISD::CondCode CC) {
489 default: assert(0 && "Unknown condition!"); abort();
490 case ISD::SETOEQ: // FIXME: This is incorrect see PR642.
491 case ISD::SETEQ: return PPC::BEQ;
492 case ISD::SETONE: // FIXME: This is incorrect see PR642.
493 case ISD::SETNE: return PPC::BNE;
494 case ISD::SETOLT: // FIXME: This is incorrect see PR642.
496 case ISD::SETLT: return PPC::BLT;
497 case ISD::SETOLE: // FIXME: This is incorrect see PR642.
499 case ISD::SETLE: return PPC::BLE;
500 case ISD::SETOGT: // FIXME: This is incorrect see PR642.
502 case ISD::SETGT: return PPC::BGT;
503 case ISD::SETOGE: // FIXME: This is incorrect see PR642.
505 case ISD::SETGE: return PPC::BGE;
507 case ISD::SETO: return PPC::BUN;
508 case ISD::SETUO: return PPC::BNU;
513 /// getCRIdxForSetCC - Return the index of the condition register field
514 /// associated with the SetCC condition, and whether or not the field is
515 /// treated as inverted. That is, lt = 0; ge = 0 inverted.
516 static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool& Inv) {
518 default: assert(0 && "Unknown condition!"); abort();
519 case ISD::SETOLT: // FIXME: This is incorrect see PR642.
521 case ISD::SETLT: Inv = false; return 0;
522 case ISD::SETOGE: // FIXME: This is incorrect see PR642.
524 case ISD::SETGE: Inv = true; return 0;
525 case ISD::SETOGT: // FIXME: This is incorrect see PR642.
527 case ISD::SETGT: Inv = false; return 1;
528 case ISD::SETOLE: // FIXME: This is incorrect see PR642.
530 case ISD::SETLE: Inv = true; return 1;
531 case ISD::SETOEQ: // FIXME: This is incorrect see PR642.
532 case ISD::SETEQ: Inv = false; return 2;
533 case ISD::SETONE: // FIXME: This is incorrect see PR642.
534 case ISD::SETNE: Inv = true; return 2;
535 case ISD::SETO: Inv = true; return 3;
536 case ISD::SETUO: Inv = false; return 3;
541 SDOperand PPCDAGToDAGISel::SelectDYNAMIC_STACKALLOC(SDOperand Op) {
544 // FIXME: We are currently ignoring the requested alignment for handling
545 // greater than the stack alignment. This will need to be revisited at some
546 // point. Align = N.getOperand(2);
547 if (!isa<ConstantSDNode>(N->getOperand(2)) ||
548 cast<ConstantSDNode>(N->getOperand(2))->getValue() != 0) {
549 std::cerr << "Cannot allocate stack object with greater alignment than"
550 << " the stack alignment yet!";
553 SDOperand Chain = Select(N->getOperand(0));
554 SDOperand Amt = Select(N->getOperand(1));
556 SDOperand R1Reg = CurDAG->getRegister(PPC::R1, MVT::i32);
558 SDOperand R1Val = CurDAG->getCopyFromReg(Chain, PPC::R1, MVT::i32);
559 Chain = R1Val.getValue(1);
561 // Subtract the amount (guaranteed to be a multiple of the stack alignment)
562 // from the stack pointer, giving us the result pointer.
563 SDOperand Result = CurDAG->getTargetNode(PPC::SUBF, MVT::i32, Amt, R1Val);
565 // Copy this result back into R1.
566 Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, R1Reg, Result);
568 // Copy this result back out of R1 to make sure we're not using the stack
569 // space without decrementing the stack pointer.
570 Result = CurDAG->getCopyFromReg(Chain, PPC::R1, MVT::i32);
572 // Finally, replace the DYNAMIC_STACKALLOC with the copyfromreg.
573 CodeGenMap[Op.getValue(0)] = Result;
574 CodeGenMap[Op.getValue(1)] = Result.getValue(1);
575 return SDOperand(Result.Val, Op.ResNo);
578 SDOperand PPCDAGToDAGISel::SelectADD_PARTS(SDOperand Op) {
580 SDOperand LHSL = Select(N->getOperand(0));
581 SDOperand LHSH = Select(N->getOperand(1));
584 bool ME = false, ZE = false;
585 if (isIntImmediate(N->getOperand(3), Imm)) {
586 ME = (signed)Imm == -1;
590 std::vector<SDOperand> Result;
591 SDOperand CarryFromLo;
592 if (isIntImmediate(N->getOperand(2), Imm) &&
593 ((signed)Imm >= -32768 || (signed)Imm < 32768)) {
594 // Codegen the low 32 bits of the add. Interestingly, there is no
595 // shifted form of add immediate carrying.
596 CarryFromLo = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag,
597 LHSL, getI32Imm(Imm));
599 CarryFromLo = CurDAG->getTargetNode(PPC::ADDC, MVT::i32, MVT::Flag,
600 LHSL, Select(N->getOperand(2)));
602 CarryFromLo = CarryFromLo.getValue(1);
604 // Codegen the high 32 bits, adding zero, minus one, or the full value
605 // along with the carry flag produced by addc/addic.
608 ResultHi = CurDAG->getTargetNode(PPC::ADDZE, MVT::i32, LHSH, CarryFromLo);
610 ResultHi = CurDAG->getTargetNode(PPC::ADDME, MVT::i32, LHSH, CarryFromLo);
612 ResultHi = CurDAG->getTargetNode(PPC::ADDE, MVT::i32, LHSH,
613 Select(N->getOperand(3)), CarryFromLo);
614 Result.push_back(CarryFromLo.getValue(0));
615 Result.push_back(ResultHi);
617 CodeGenMap[Op.getValue(0)] = Result[0];
618 CodeGenMap[Op.getValue(1)] = Result[1];
619 return Result[Op.ResNo];
621 SDOperand PPCDAGToDAGISel::SelectSUB_PARTS(SDOperand Op) {
623 SDOperand LHSL = Select(N->getOperand(0));
624 SDOperand LHSH = Select(N->getOperand(1));
625 SDOperand RHSL = Select(N->getOperand(2));
626 SDOperand RHSH = Select(N->getOperand(3));
628 std::vector<SDOperand> Result;
629 Result.push_back(CurDAG->getTargetNode(PPC::SUBFC, MVT::i32, MVT::Flag,
631 Result.push_back(CurDAG->getTargetNode(PPC::SUBFE, MVT::i32, RHSH, LHSH,
632 Result[0].getValue(1)));
633 CodeGenMap[Op.getValue(0)] = Result[0];
634 CodeGenMap[Op.getValue(1)] = Result[1];
635 return Result[Op.ResNo];
638 SDOperand PPCDAGToDAGISel::SelectSETCC(SDOperand Op) {
641 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
642 if (isIntImmediate(N->getOperand(1), Imm)) {
643 // We can codegen setcc op, imm very efficiently compared to a brcond.
644 // Check for those cases here.
647 SDOperand Op = Select(N->getOperand(0));
651 Op = CurDAG->getTargetNode(PPC::CNTLZW, MVT::i32, Op);
652 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Op, getI32Imm(27),
653 getI32Imm(5), getI32Imm(31));
654 return SDOperand(N, 0);
656 SDOperand AD = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag,
658 CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op, AD.getValue(1));
659 return SDOperand(N, 0);
662 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Op, getI32Imm(1),
663 getI32Imm(31), getI32Imm(31));
664 return SDOperand(N, 0);
666 SDOperand T = CurDAG->getTargetNode(PPC::NEG, MVT::i32, Op);
667 T = CurDAG->getTargetNode(PPC::ANDC, MVT::i32, T, Op);;
668 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, T, getI32Imm(1),
669 getI32Imm(31), getI32Imm(31));
670 return SDOperand(N, 0);
673 } else if (Imm == ~0U) { // setcc op, -1
674 SDOperand Op = Select(N->getOperand(0));
678 Op = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag,
680 CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
681 CurDAG->getTargetNode(PPC::LI, MVT::i32,
684 return SDOperand(N, 0);
686 Op = CurDAG->getTargetNode(PPC::NOR, MVT::i32, Op, Op);
687 SDOperand AD = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag,
689 CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op, AD.getValue(1));
690 return SDOperand(N, 0);
693 SDOperand AD = CurDAG->getTargetNode(PPC::ADDI, MVT::i32, Op,
695 SDOperand AN = CurDAG->getTargetNode(PPC::AND, MVT::i32, AD, Op);
696 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, AN, getI32Imm(1),
697 getI32Imm(31), getI32Imm(31));
698 return SDOperand(N, 0);
701 Op = CurDAG->getTargetNode(PPC::RLWINM, MVT::i32, Op, getI32Imm(1),
702 getI32Imm(31), getI32Imm(31));
703 CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Op, getI32Imm(1));
704 return SDOperand(N, 0);
710 unsigned Idx = getCRIdxForSetCC(CC, Inv);
711 SDOperand CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC);
714 // Force the ccreg into CR7.
715 SDOperand CR7Reg = CurDAG->getRegister(PPC::CR7, MVT::i32);
717 std::vector<MVT::ValueType> VTs;
718 VTs.push_back(MVT::Other);
719 VTs.push_back(MVT::Flag); // NONSTANDARD CopyToReg node: defines a flag
720 std::vector<SDOperand> Ops;
721 Ops.push_back(CurDAG->getEntryNode());
722 Ops.push_back(CR7Reg);
723 Ops.push_back(CCReg);
724 CCReg = CurDAG->getNode(ISD::CopyToReg, VTs, Ops).getValue(1);
726 if (TLI.getTargetMachine().getSubtarget<PPCSubtarget>().isGigaProcessor())
727 IntCR = CurDAG->getTargetNode(PPC::MFOCRF, MVT::i32, CR7Reg, CCReg);
729 IntCR = CurDAG->getTargetNode(PPC::MFCR, MVT::i32, CCReg);
732 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, IntCR,
733 getI32Imm((32-(3-Idx)) & 31),
734 getI32Imm(31), getI32Imm(31));
737 CurDAG->getTargetNode(PPC::RLWINM, MVT::i32, IntCR,
738 getI32Imm((32-(3-Idx)) & 31),
739 getI32Imm(31),getI32Imm(31));
740 CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Tmp, getI32Imm(1));
743 return SDOperand(N, 0);
746 /// isCallCompatibleAddress - Return true if the specified 32-bit value is
747 /// representable in the immediate field of a Bx instruction.
748 static bool isCallCompatibleAddress(ConstantSDNode *C) {
749 int Addr = C->getValue();
750 if (Addr & 3) return false; // Low 2 bits are implicitly zero.
751 return (Addr << 6 >> 6) == Addr; // Top 6 bits have to be sext of immediate.
754 SDOperand PPCDAGToDAGISel::SelectCALL(SDOperand Op) {
756 SDOperand Chain = Select(N->getOperand(0));
759 std::vector<SDOperand> CallOperands;
761 if (GlobalAddressSDNode *GASD =
762 dyn_cast<GlobalAddressSDNode>(N->getOperand(1))) {
763 CallOpcode = PPC::BL;
764 CallOperands.push_back(N->getOperand(1));
765 } else if (ExternalSymbolSDNode *ESSDN =
766 dyn_cast<ExternalSymbolSDNode>(N->getOperand(1))) {
767 CallOpcode = PPC::BL;
768 CallOperands.push_back(N->getOperand(1));
769 } else if (isa<ConstantSDNode>(N->getOperand(1)) &&
770 isCallCompatibleAddress(cast<ConstantSDNode>(N->getOperand(1)))) {
771 ConstantSDNode *C = cast<ConstantSDNode>(N->getOperand(1));
772 CallOpcode = PPC::BLA;
773 CallOperands.push_back(getI32Imm((int)C->getValue() >> 2));
775 // Copy the callee address into the CTR register.
776 SDOperand Callee = Select(N->getOperand(1));
777 Chain = CurDAG->getTargetNode(PPC::MTCTR, MVT::Other, Callee, Chain);
779 // Copy the callee address into R12 on darwin.
780 SDOperand R12 = CurDAG->getRegister(PPC::R12, MVT::i32);
781 Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, R12, Callee);
783 CallOperands.push_back(R12);
784 CallOpcode = PPC::BCTRL;
787 unsigned GPR_idx = 0, FPR_idx = 0;
788 static const unsigned GPR[] = {
789 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
790 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
792 static const unsigned FPR[] = {
793 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
794 PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
797 SDOperand InFlag; // Null incoming flag value.
799 for (unsigned i = 2, e = N->getNumOperands(); i != e; ++i) {
800 unsigned DestReg = 0;
801 MVT::ValueType RegTy = N->getOperand(i).getValueType();
802 if (RegTy == MVT::i32) {
803 assert(GPR_idx < 8 && "Too many int args");
804 DestReg = GPR[GPR_idx++];
806 assert(MVT::isFloatingPoint(N->getOperand(i).getValueType()) &&
807 "Unpromoted integer arg?");
808 assert(FPR_idx < 13 && "Too many fp args");
809 DestReg = FPR[FPR_idx++];
812 if (N->getOperand(i).getOpcode() != ISD::UNDEF) {
813 SDOperand Val = Select(N->getOperand(i));
814 Chain = CurDAG->getCopyToReg(Chain, DestReg, Val, InFlag);
815 InFlag = Chain.getValue(1);
816 CallOperands.push_back(CurDAG->getRegister(DestReg, RegTy));
820 // Finally, once everything is in registers to pass to the call, emit the
823 CallOperands.push_back(InFlag); // Strong dep on register copies.
825 CallOperands.push_back(Chain); // Weak dep on whatever occurs before
826 Chain = CurDAG->getTargetNode(CallOpcode, MVT::Other, MVT::Flag,
829 std::vector<SDOperand> CallResults;
831 // If the call has results, copy the values out of the ret val registers.
832 switch (N->getValueType(0)) {
833 default: assert(0 && "Unexpected ret value!");
834 case MVT::Other: break;
836 if (N->getValueType(1) == MVT::i32) {
837 Chain = CurDAG->getCopyFromReg(Chain, PPC::R4, MVT::i32,
838 Chain.getValue(1)).getValue(1);
839 CallResults.push_back(Chain.getValue(0));
840 Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32,
841 Chain.getValue(2)).getValue(1);
842 CallResults.push_back(Chain.getValue(0));
844 Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32,
845 Chain.getValue(1)).getValue(1);
846 CallResults.push_back(Chain.getValue(0));
851 Chain = CurDAG->getCopyFromReg(Chain, PPC::F1, N->getValueType(0),
852 Chain.getValue(1)).getValue(1);
853 CallResults.push_back(Chain.getValue(0));
857 CallResults.push_back(Chain);
858 for (unsigned i = 0, e = CallResults.size(); i != e; ++i)
859 CodeGenMap[Op.getValue(i)] = CallResults[i];
860 return CallResults[Op.ResNo];
863 // Select - Convert the specified operand from a target-independent to a
864 // target-specific node if it hasn't already been changed.
865 SDOperand PPCDAGToDAGISel::Select(SDOperand Op) {
867 if (N->getOpcode() >= ISD::BUILTIN_OP_END &&
868 N->getOpcode() < PPCISD::FIRST_NUMBER)
869 return Op; // Already selected.
871 // If this has already been converted, use it.
872 std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(Op);
873 if (CGMI != CodeGenMap.end()) return CGMI->second;
875 switch (N->getOpcode()) {
877 case ISD::DYNAMIC_STACKALLOC: return SelectDYNAMIC_STACKALLOC(Op);
878 case ISD::ADD_PARTS: return SelectADD_PARTS(Op);
879 case ISD::SUB_PARTS: return SelectSUB_PARTS(Op);
880 case ISD::SETCC: return SelectSETCC(Op);
881 case ISD::CALL: return SelectCALL(Op);
882 case ISD::TAILCALL: return SelectCALL(Op);
883 case PPCISD::GlobalBaseReg: return getGlobalBaseReg();
885 case ISD::FrameIndex: {
886 int FI = cast<FrameIndexSDNode>(N)->getIndex();
887 if (N->hasOneUse()) {
888 CurDAG->SelectNodeTo(N, PPC::ADDI, MVT::i32,
889 CurDAG->getTargetFrameIndex(FI, MVT::i32),
891 return SDOperand(N, 0);
893 return CurDAG->getTargetNode(PPC::ADDI, MVT::i32,
894 CurDAG->getTargetFrameIndex(FI, MVT::i32),
897 case ISD::ConstantPool: {
898 Constant *C = cast<ConstantPoolSDNode>(N)->get();
899 SDOperand Tmp, CPI = CurDAG->getTargetConstantPool(C, MVT::i32);
901 Tmp = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(),CPI);
903 Tmp = CurDAG->getTargetNode(PPC::LIS, MVT::i32, CPI);
904 if (N->hasOneUse()) {
905 CurDAG->SelectNodeTo(N, PPC::LA, MVT::i32, Tmp, CPI);
906 return SDOperand(N, 0);
908 return CurDAG->getTargetNode(PPC::LA, MVT::i32, Tmp, CPI);
911 case ISD::GlobalAddress: {
912 GlobalValue *GV = cast<GlobalAddressSDNode>(N)->getGlobal();
914 SDOperand GA = CurDAG->getTargetGlobalAddress(GV, MVT::i32);
916 Tmp = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(), GA);
918 Tmp = CurDAG->getTargetNode(PPC::LIS, MVT::i32, GA);
920 if (GV->hasWeakLinkage() || GV->isExternal())
921 return CurDAG->getTargetNode(PPC::LWZ, MVT::i32, GA, Tmp);
923 return CurDAG->getTargetNode(PPC::LA, MVT::i32, Tmp, GA);
927 MVT::ValueType Ty = N->getValueType(0);
928 if (!NoExcessFPPrecision) { // Match FMA ops
929 if (N->getOperand(0).getOpcode() == ISD::FMUL &&
930 N->getOperand(0).Val->hasOneUse()) {
931 ++FusedFP; // Statistic
932 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FMADD : PPC::FMADDS, Ty,
933 Select(N->getOperand(0).getOperand(0)),
934 Select(N->getOperand(0).getOperand(1)),
935 Select(N->getOperand(1)));
936 return SDOperand(N, 0);
937 } else if (N->getOperand(1).getOpcode() == ISD::FMUL &&
938 N->getOperand(1).hasOneUse()) {
939 ++FusedFP; // Statistic
940 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FMADD : PPC::FMADDS, Ty,
941 Select(N->getOperand(1).getOperand(0)),
942 Select(N->getOperand(1).getOperand(1)),
943 Select(N->getOperand(0)));
944 return SDOperand(N, 0);
948 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FADD : PPC::FADDS, Ty,
949 Select(N->getOperand(0)), Select(N->getOperand(1)));
950 return SDOperand(N, 0);
953 MVT::ValueType Ty = N->getValueType(0);
955 if (!NoExcessFPPrecision) { // Match FMA ops
956 if (N->getOperand(0).getOpcode() == ISD::FMUL &&
957 N->getOperand(0).Val->hasOneUse()) {
958 ++FusedFP; // Statistic
959 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FMSUB : PPC::FMSUBS, Ty,
960 Select(N->getOperand(0).getOperand(0)),
961 Select(N->getOperand(0).getOperand(1)),
962 Select(N->getOperand(1)));
963 return SDOperand(N, 0);
964 } else if (N->getOperand(1).getOpcode() == ISD::FMUL &&
965 N->getOperand(1).Val->hasOneUse()) {
966 ++FusedFP; // Statistic
967 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FNMSUB : PPC::FNMSUBS, Ty,
968 Select(N->getOperand(1).getOperand(0)),
969 Select(N->getOperand(1).getOperand(1)),
970 Select(N->getOperand(0)));
971 return SDOperand(N, 0);
974 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FSUB : PPC::FSUBS, Ty,
975 Select(N->getOperand(0)),
976 Select(N->getOperand(1)));
977 return SDOperand(N, 0);
980 // FIXME: since this depends on the setting of the carry flag from the srawi
981 // we should really be making notes about that for the scheduler.
982 // FIXME: It sure would be nice if we could cheaply recognize the
983 // srl/add/sra pattern the dag combiner will generate for this as
984 // sra/addze rather than having to handle sdiv ourselves. oh well.
986 if (isIntImmediate(N->getOperand(1), Imm)) {
987 if ((signed)Imm > 0 && isPowerOf2_32(Imm)) {
989 CurDAG->getTargetNode(PPC::SRAWI, MVT::i32, MVT::Flag,
990 Select(N->getOperand(0)),
991 getI32Imm(Log2_32(Imm)));
992 CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
993 Op.getValue(0), Op.getValue(1));
994 return SDOperand(N, 0);
995 } else if ((signed)Imm < 0 && isPowerOf2_32(-Imm)) {
997 CurDAG->getTargetNode(PPC::SRAWI, MVT::i32, MVT::Flag,
998 Select(N->getOperand(0)),
999 getI32Imm(Log2_32(-Imm)));
1001 CurDAG->getTargetNode(PPC::ADDZE, MVT::i32, Op.getValue(0),
1003 CurDAG->SelectNodeTo(N, PPC::NEG, MVT::i32, PT);
1004 return SDOperand(N, 0);
1008 // Other cases are autogenerated.
1013 // If this is an and of a value rotated between 0 and 31 bits and then and'd
1014 // with a mask, emit rlwinm
1015 if (isIntImmediate(N->getOperand(1), Imm) && (isShiftedMask_32(Imm) ||
1016 isShiftedMask_32(~Imm))) {
1018 unsigned SH, MB, ME;
1019 if (isRotateAndMask(N->getOperand(0).Val, Imm, false, SH, MB, ME)) {
1020 Val = Select(N->getOperand(0).getOperand(0));
1021 } else if (Imm == 0) {
1022 // AND X, 0 -> 0, not "rlwinm 32".
1023 return Select(N->getOperand(1));
1025 Val = Select(N->getOperand(0));
1026 isRunOfOnes(Imm, MB, ME);
1029 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Val, getI32Imm(SH),
1030 getI32Imm(MB), getI32Imm(ME));
1031 return SDOperand(N, 0);
1034 // Other cases are autogenerated.
1038 if (SDNode *I = SelectBitfieldInsert(N))
1039 return CodeGenMap[Op] = SDOperand(I, 0);
1041 // Other cases are autogenerated.
1044 unsigned Imm, SH, MB, ME;
1045 if (isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) &&
1046 isRotateAndMask(N, Imm, true, SH, MB, ME)) {
1047 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32,
1048 Select(N->getOperand(0).getOperand(0)),
1049 getI32Imm(SH), getI32Imm(MB), getI32Imm(ME));
1050 return SDOperand(N, 0);
1053 // Other cases are autogenerated.
1057 unsigned Imm, SH, MB, ME;
1058 if (isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) &&
1059 isRotateAndMask(N, Imm, true, SH, MB, ME)) {
1060 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32,
1061 Select(N->getOperand(0).getOperand(0)),
1062 getI32Imm(SH & 0x1F), getI32Imm(MB), getI32Imm(ME));
1063 return SDOperand(N, 0);
1066 // Other cases are autogenerated.
1070 SDOperand Val = Select(N->getOperand(0));
1071 MVT::ValueType Ty = N->getValueType(0);
1072 if (N->getOperand(0).Val->hasOneUse()) {
1074 switch (Val.isTargetOpcode() ? Val.getTargetOpcode() : 0) {
1075 default: Opc = 0; break;
1076 case PPC::FABSS: Opc = PPC::FNABSS; break;
1077 case PPC::FABSD: Opc = PPC::FNABSD; break;
1078 case PPC::FMADD: Opc = PPC::FNMADD; break;
1079 case PPC::FMADDS: Opc = PPC::FNMADDS; break;
1080 case PPC::FMSUB: Opc = PPC::FNMSUB; break;
1081 case PPC::FMSUBS: Opc = PPC::FNMSUBS; break;
1083 // If we inverted the opcode, then emit the new instruction with the
1084 // inverted opcode and the original instruction's operands. Otherwise,
1085 // fall through and generate a fneg instruction.
1087 if (Opc == PPC::FNABSS || Opc == PPC::FNABSD)
1088 CurDAG->SelectNodeTo(N, Opc, Ty, Val.getOperand(0));
1090 CurDAG->SelectNodeTo(N, Opc, Ty, Val.getOperand(0),
1091 Val.getOperand(1), Val.getOperand(2));
1092 return SDOperand(N, 0);
1096 CurDAG->SelectNodeTo(N, PPC::FNEGS, MVT::f32, Val);
1098 CurDAG->SelectNodeTo(N, PPC::FNEGD, MVT::f64, Val);
1099 return SDOperand(N, 0);
1104 case ISD::SEXTLOAD: {
1106 bool isIdx = SelectAddr(N->getOperand(1), Op1, Op2);
1108 MVT::ValueType TypeBeingLoaded = (N->getOpcode() == ISD::LOAD) ?
1109 N->getValueType(0) : cast<VTSDNode>(N->getOperand(3))->getVT();
1111 switch (TypeBeingLoaded) {
1112 default: N->dump(); assert(0 && "Cannot load this type!");
1114 case MVT::i8: Opc = isIdx ? PPC::LBZX : PPC::LBZ; break;
1116 if (N->getOpcode() == ISD::SEXTLOAD) { // SEXT load?
1117 Opc = isIdx ? PPC::LHAX : PPC::LHA;
1119 Opc = isIdx ? PPC::LHZX : PPC::LHZ;
1122 case MVT::i32: Opc = isIdx ? PPC::LWZX : PPC::LWZ; break;
1123 case MVT::f32: Opc = isIdx ? PPC::LFSX : PPC::LFS; break;
1124 case MVT::f64: Opc = isIdx ? PPC::LFDX : PPC::LFD; break;
1127 // If this is an f32 -> f64 load, emit the f32 load, then use an 'extending
1129 if (TypeBeingLoaded != MVT::f32 || N->getOpcode() == ISD::LOAD) {
1130 CurDAG->SelectNodeTo(N, Opc, N->getValueType(0), MVT::Other,
1131 Op1, Op2, Select(N->getOperand(0)));
1132 return SDOperand(N, Op.ResNo);
1134 std::vector<SDOperand> Ops;
1137 Ops.push_back(Select(N->getOperand(0)));
1138 SDOperand Res = CurDAG->getTargetNode(Opc, MVT::f32, MVT::Other, Ops);
1139 SDOperand Ext = CurDAG->getTargetNode(PPC::FMRSD, MVT::f64, Res);
1140 CodeGenMap[Op.getValue(0)] = Ext;
1141 CodeGenMap[Op.getValue(1)] = Res.getValue(1);
1143 return Res.getValue(1);
1148 case ISD::TRUNCSTORE:
1150 SDOperand AddrOp1, AddrOp2;
1151 bool isIdx = SelectAddr(N->getOperand(2), AddrOp1, AddrOp2);
1154 if (N->getOpcode() == ISD::STORE) {
1155 switch (N->getOperand(1).getValueType()) {
1156 default: assert(0 && "unknown Type in store");
1157 case MVT::i32: Opc = isIdx ? PPC::STWX : PPC::STW; break;
1158 case MVT::f64: Opc = isIdx ? PPC::STFDX : PPC::STFD; break;
1159 case MVT::f32: Opc = isIdx ? PPC::STFSX : PPC::STFS; break;
1161 } else { //ISD::TRUNCSTORE
1162 switch(cast<VTSDNode>(N->getOperand(4))->getVT()) {
1163 default: assert(0 && "unknown Type in store");
1164 case MVT::i8: Opc = isIdx ? PPC::STBX : PPC::STB; break;
1165 case MVT::i16: Opc = isIdx ? PPC::STHX : PPC::STH; break;
1169 CurDAG->SelectNodeTo(N, Opc, MVT::Other, Select(N->getOperand(1)),
1170 AddrOp1, AddrOp2, Select(N->getOperand(0)));
1171 return SDOperand(N, 0);
1174 case ISD::SELECT_CC: {
1175 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
1177 // handle the setcc cases here. select_cc lhs, 0, 1, 0, cc
1178 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N->getOperand(1)))
1179 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N->getOperand(2)))
1180 if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N->getOperand(3)))
1181 if (N1C->isNullValue() && N3C->isNullValue() &&
1182 N2C->getValue() == 1ULL && CC == ISD::SETNE) {
1183 SDOperand LHS = Select(N->getOperand(0));
1185 CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag,
1186 LHS, getI32Imm(~0U));
1187 CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, Tmp, LHS,
1189 return SDOperand(N, 0);
1192 SDOperand CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC);
1193 unsigned BROpc = getBCCForSetCC(CC);
1195 bool isFP = MVT::isFloatingPoint(N->getValueType(0));
1196 unsigned SelectCCOp;
1197 if (MVT::isInteger(N->getValueType(0)))
1198 SelectCCOp = PPC::SELECT_CC_Int;
1199 else if (N->getValueType(0) == MVT::f32)
1200 SelectCCOp = PPC::SELECT_CC_F4;
1202 SelectCCOp = PPC::SELECT_CC_F8;
1203 CurDAG->SelectNodeTo(N, SelectCCOp, N->getValueType(0), CCReg,
1204 Select(N->getOperand(2)), Select(N->getOperand(3)),
1206 return SDOperand(N, 0);
1209 case ISD::CALLSEQ_START:
1210 case ISD::CALLSEQ_END: {
1211 unsigned Amt = cast<ConstantSDNode>(N->getOperand(1))->getValue();
1212 unsigned Opc = N->getOpcode() == ISD::CALLSEQ_START ?
1213 PPC::ADJCALLSTACKDOWN : PPC::ADJCALLSTACKUP;
1214 CurDAG->SelectNodeTo(N, Opc, MVT::Other,
1215 getI32Imm(Amt), Select(N->getOperand(0)));
1216 return SDOperand(N, 0);
1219 SDOperand Chain = Select(N->getOperand(0)); // Token chain.
1221 if (N->getNumOperands() == 2) {
1222 SDOperand Val = Select(N->getOperand(1));
1223 if (N->getOperand(1).getValueType() == MVT::i32) {
1224 Chain = CurDAG->getCopyToReg(Chain, PPC::R3, Val);
1226 assert(MVT::isFloatingPoint(N->getOperand(1).getValueType()));
1227 Chain = CurDAG->getCopyToReg(Chain, PPC::F1, Val);
1229 } else if (N->getNumOperands() > 1) {
1230 assert(N->getOperand(1).getValueType() == MVT::i32 &&
1231 N->getOperand(2).getValueType() == MVT::i32 &&
1232 N->getNumOperands() == 3 && "Unknown two-register ret value!");
1233 Chain = CurDAG->getCopyToReg(Chain, PPC::R4, Select(N->getOperand(1)));
1234 Chain = CurDAG->getCopyToReg(Chain, PPC::R3, Select(N->getOperand(2)));
1237 // Finally, select this to a blr (return) instruction.
1238 CurDAG->SelectNodeTo(N, PPC::BLR, MVT::Other, Chain);
1239 return SDOperand(N, 0);
1242 CurDAG->SelectNodeTo(N, PPC::B, MVT::Other, N->getOperand(1),
1243 Select(N->getOperand(0)));
1244 return SDOperand(N, 0);
1246 case ISD::BRTWOWAY_CC: {
1247 SDOperand Chain = Select(N->getOperand(0));
1248 MachineBasicBlock *Dest =
1249 cast<BasicBlockSDNode>(N->getOperand(4))->getBasicBlock();
1250 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
1251 SDOperand CondCode = SelectCC(N->getOperand(2), N->getOperand(3), CC);
1253 // If this is a two way branch, then grab the fallthrough basic block
1254 // argument and build a PowerPC branch pseudo-op, suitable for long branch
1255 // conversion if necessary by the branch selection pass. Otherwise, emit a
1256 // standard conditional branch.
1257 if (N->getOpcode() == ISD::BRTWOWAY_CC) {
1258 SDOperand CondTrueBlock = N->getOperand(4);
1259 SDOperand CondFalseBlock = N->getOperand(5);
1261 // If the false case is the current basic block, then this is a self loop.
1262 // We do not want to emit "Loop: ... brcond Out; br Loop", as it adds an
1263 // extra dispatch group to the loop. Instead, invert the condition and
1264 // emit "Loop: ... br!cond Loop; br Out
1265 if (cast<BasicBlockSDNode>(CondFalseBlock)->getBasicBlock() == BB) {
1266 std::swap(CondTrueBlock, CondFalseBlock);
1267 CC = getSetCCInverse(CC,
1268 MVT::isInteger(N->getOperand(2).getValueType()));
1271 unsigned Opc = getBCCForSetCC(CC);
1272 SDOperand CB = CurDAG->getTargetNode(PPC::COND_BRANCH, MVT::Other,
1273 CondCode, getI32Imm(Opc),
1274 CondTrueBlock, CondFalseBlock,
1276 CurDAG->SelectNodeTo(N, PPC::B, MVT::Other, CondFalseBlock, CB);
1278 // Iterate to the next basic block
1279 ilist<MachineBasicBlock>::iterator It = BB;
1282 // If the fallthrough path is off the end of the function, which would be
1283 // undefined behavior, set it to be the same as the current block because
1284 // we have nothing better to set it to, and leaving it alone will cause
1285 // the PowerPC Branch Selection pass to crash.
1286 if (It == BB->getParent()->end()) It = Dest;
1287 CurDAG->SelectNodeTo(N, PPC::COND_BRANCH, MVT::Other, CondCode,
1288 getI32Imm(getBCCForSetCC(CC)), N->getOperand(4),
1289 CurDAG->getBasicBlock(It), Chain);
1291 return SDOperand(N, 0);
1295 return SelectCode(Op);
1299 /// createPPCISelDag - This pass converts a legalized DAG into a
1300 /// PowerPC-specific DAG, ready for instruction scheduling.
1302 FunctionPass *llvm::createPPCISelDag(TargetMachine &TM) {
1303 return new PPCDAGToDAGISel(TM);