1 //===-- PPCISelDAGToDAG.cpp - PPC --pattern matching inst selector --------===//
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 a pattern matching instruction selector for PowerPC,
11 // converting from a legalized dag to a PPC dag.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "ppc-codegen"
17 #include "PPCPredicates.h"
18 #include "PPCTargetMachine.h"
19 #include "PPCHazardRecognizers.h"
20 #include "llvm/CodeGen/MachineInstrBuilder.h"
21 #include "llvm/CodeGen/MachineFunction.h"
22 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
23 #include "llvm/CodeGen/MachineRegisterInfo.h"
24 #include "llvm/CodeGen/SelectionDAG.h"
25 #include "llvm/CodeGen/SelectionDAGISel.h"
26 #include "llvm/Target/TargetOptions.h"
27 #include "llvm/Constants.h"
28 #include "llvm/Function.h"
29 #include "llvm/GlobalValue.h"
30 #include "llvm/Intrinsics.h"
31 #include "llvm/Support/Debug.h"
32 #include "llvm/Support/MathExtras.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/raw_ostream.h"
38 //===--------------------------------------------------------------------===//
39 /// PPCDAGToDAGISel - PPC specific code to select PPC machine
40 /// instructions for SelectionDAG operations.
42 class PPCDAGToDAGISel : public SelectionDAGISel {
43 const PPCTargetMachine &TM;
44 const PPCTargetLowering &PPCLowering;
45 const PPCSubtarget &PPCSubTarget;
46 unsigned GlobalBaseReg;
48 explicit PPCDAGToDAGISel(PPCTargetMachine &tm)
49 : SelectionDAGISel(tm), TM(tm),
50 PPCLowering(*TM.getTargetLowering()),
51 PPCSubTarget(*TM.getSubtargetImpl()) {}
53 virtual bool runOnMachineFunction(MachineFunction &MF) {
54 // Make sure we re-emit a set of the global base reg if necessary
56 SelectionDAGISel::runOnMachineFunction(MF);
62 /// getI32Imm - Return a target constant with the specified value, of type
64 inline SDValue getI32Imm(unsigned Imm) {
65 return CurDAG->getTargetConstant(Imm, MVT::i32);
68 /// getI64Imm - Return a target constant with the specified value, of type
70 inline SDValue getI64Imm(uint64_t Imm) {
71 return CurDAG->getTargetConstant(Imm, MVT::i64);
74 /// getSmallIPtrImm - Return a target constant of pointer type.
75 inline SDValue getSmallIPtrImm(unsigned Imm) {
76 return CurDAG->getTargetConstant(Imm, PPCLowering.getPointerTy());
79 /// isRunOfOnes - Returns true iff Val consists of one contiguous run of 1s
80 /// with any number of 0s on either side. The 1s are allowed to wrap from
81 /// LSB to MSB, so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs.
82 /// 0x0F0F0000 is not, since all 1s are not contiguous.
83 static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME);
86 /// isRotateAndMask - Returns true if Mask and Shift can be folded into a
87 /// rotate and mask opcode and mask operation.
88 static bool isRotateAndMask(SDNode *N, unsigned Mask, bool isShiftMask,
89 unsigned &SH, unsigned &MB, unsigned &ME);
91 /// getGlobalBaseReg - insert code into the entry mbb to materialize the PIC
92 /// base register. Return the virtual register that holds this value.
93 SDNode *getGlobalBaseReg();
95 // Select - Convert the specified operand from a target-independent to a
96 // target-specific node if it hasn't already been changed.
97 SDNode *Select(SDNode *N);
99 SDNode *SelectBitfieldInsert(SDNode *N);
101 /// SelectCC - Select a comparison of the specified values with the
102 /// specified condition code, returning the CR# of the expression.
103 SDValue SelectCC(SDValue LHS, SDValue RHS, ISD::CondCode CC, DebugLoc dl);
105 /// SelectAddrImm - Returns true if the address N can be represented by
106 /// a base register plus a signed 16-bit displacement [r+imm].
107 bool SelectAddrImm(SDNode *Op, SDValue N, SDValue &Disp,
109 return PPCLowering.SelectAddressRegImm(N, Disp, Base, *CurDAG);
112 /// SelectAddrImmOffs - Return true if the operand is valid for a preinc
113 /// immediate field. Because preinc imms have already been validated, just
115 bool SelectAddrImmOffs(SDNode *Op, SDValue N, SDValue &Out) const {
120 /// SelectAddrIdx - Given the specified addressed, check to see if it can be
121 /// represented as an indexed [r+r] operation. Returns false if it can
122 /// be represented by [r+imm], which are preferred.
123 bool SelectAddrIdx(SDNode *Op, SDValue N, SDValue &Base,
125 return PPCLowering.SelectAddressRegReg(N, Base, Index, *CurDAG);
128 /// SelectAddrIdxOnly - Given the specified addressed, force it to be
129 /// represented as an indexed [r+r] operation.
130 bool SelectAddrIdxOnly(SDNode *Op, SDValue N, SDValue &Base,
132 return PPCLowering.SelectAddressRegRegOnly(N, Base, Index, *CurDAG);
135 /// SelectAddrImmShift - Returns true if the address N can be represented by
136 /// a base register plus a signed 14-bit displacement [r+imm*4]. Suitable
137 /// for use by STD and friends.
138 bool SelectAddrImmShift(SDNode *Op, SDValue N, SDValue &Disp,
140 return PPCLowering.SelectAddressRegImmShift(N, Disp, Base, *CurDAG);
143 /// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
144 /// inline asm expressions. It is always correct to compute the value into
145 /// a register. The case of adding a (possibly relocatable) constant to a
146 /// register can be improved, but it is wrong to substitute Reg+Reg for
147 /// Reg in an asm, because the load or store opcode would have to change.
148 virtual bool SelectInlineAsmMemoryOperand(const SDValue &Op,
150 std::vector<SDValue> &OutOps) {
151 OutOps.push_back(Op);
155 SDValue BuildSDIVSequence(SDNode *N);
156 SDValue BuildUDIVSequence(SDNode *N);
158 void InsertVRSaveCode(MachineFunction &MF);
160 virtual const char *getPassName() const {
161 return "PowerPC DAG->DAG Pattern Instruction Selection";
164 /// CreateTargetHazardRecognizer - Return the hazard recognizer to use for
165 /// this target when scheduling the DAG.
166 virtual ScheduleHazardRecognizer *CreateTargetHazardRecognizer() {
167 // Should use subtarget info to pick the right hazard recognizer. For
168 // now, always return a PPC970 recognizer.
169 const TargetInstrInfo *II = TM.getInstrInfo();
170 assert(II && "No InstrInfo?");
171 return new PPCHazardRecognizer970(*II);
174 // Include the pieces autogenerated from the target description.
175 #include "PPCGenDAGISel.inc"
178 SDNode *SelectSETCC(SDNode *N);
182 /// InsertVRSaveCode - Once the entire function has been instruction selected,
183 /// all virtual registers are created and all machine instructions are built,
184 /// check to see if we need to save/restore VRSAVE. If so, do it.
185 void PPCDAGToDAGISel::InsertVRSaveCode(MachineFunction &Fn) {
186 // Check to see if this function uses vector registers, which means we have to
187 // save and restore the VRSAVE register and update it with the regs we use.
189 // In this case, there will be virtual registers of vector type created
190 // by the scheduler. Detect them now.
191 bool HasVectorVReg = false;
192 for (unsigned i = TargetRegisterInfo::FirstVirtualRegister,
193 e = RegInfo->getLastVirtReg()+1; i != e; ++i)
194 if (RegInfo->getRegClass(i) == &PPC::VRRCRegClass) {
195 HasVectorVReg = true;
198 if (!HasVectorVReg) return; // nothing to do.
200 // If we have a vector register, we want to emit code into the entry and exit
201 // blocks to save and restore the VRSAVE register. We do this here (instead
202 // of marking all vector instructions as clobbering VRSAVE) for two reasons:
204 // 1. This (trivially) reduces the load on the register allocator, by not
205 // having to represent the live range of the VRSAVE register.
206 // 2. This (more significantly) allows us to create a temporary virtual
207 // register to hold the saved VRSAVE value, allowing this temporary to be
208 // register allocated, instead of forcing it to be spilled to the stack.
210 // Create two vregs - one to hold the VRSAVE register that is live-in to the
211 // function and one for the value after having bits or'd into it.
212 unsigned InVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
213 unsigned UpdatedVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
215 const TargetInstrInfo &TII = *TM.getInstrInfo();
216 MachineBasicBlock &EntryBB = *Fn.begin();
218 // Emit the following code into the entry block:
219 // InVRSAVE = MFVRSAVE
220 // UpdatedVRSAVE = UPDATE_VRSAVE InVRSAVE
221 // MTVRSAVE UpdatedVRSAVE
222 MachineBasicBlock::iterator IP = EntryBB.begin(); // Insert Point
223 BuildMI(EntryBB, IP, dl, TII.get(PPC::MFVRSAVE), InVRSAVE);
224 BuildMI(EntryBB, IP, dl, TII.get(PPC::UPDATE_VRSAVE),
225 UpdatedVRSAVE).addReg(InVRSAVE);
226 BuildMI(EntryBB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(UpdatedVRSAVE);
228 // Find all return blocks, outputting a restore in each epilog.
229 for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
230 if (!BB->empty() && BB->back().getDesc().isReturn()) {
231 IP = BB->end(); --IP;
233 // Skip over all terminator instructions, which are part of the return
235 MachineBasicBlock::iterator I2 = IP;
236 while (I2 != BB->begin() && (--I2)->getDesc().isTerminator())
239 // Emit: MTVRSAVE InVRSave
240 BuildMI(*BB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(InVRSAVE);
246 /// getGlobalBaseReg - Output the instructions required to put the
247 /// base address to use for accessing globals into a register.
249 SDNode *PPCDAGToDAGISel::getGlobalBaseReg() {
250 if (!GlobalBaseReg) {
251 const TargetInstrInfo &TII = *TM.getInstrInfo();
252 // Insert the set of GlobalBaseReg into the first MBB of the function
253 MachineBasicBlock &FirstMBB = MF->front();
254 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
257 if (PPCLowering.getPointerTy() == MVT::i32) {
258 GlobalBaseReg = RegInfo->createVirtualRegister(PPC::GPRCRegisterClass);
259 BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR), PPC::LR);
260 BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
262 GlobalBaseReg = RegInfo->createVirtualRegister(PPC::G8RCRegisterClass);
263 BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR8), PPC::LR8);
264 BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR8), GlobalBaseReg);
267 return CurDAG->getRegister(GlobalBaseReg,
268 PPCLowering.getPointerTy()).getNode();
271 /// isIntS16Immediate - This method tests to see if the node is either a 32-bit
272 /// or 64-bit immediate, and if the value can be accurately represented as a
273 /// sign extension from a 16-bit value. If so, this returns true and the
275 static bool isIntS16Immediate(SDNode *N, short &Imm) {
276 if (N->getOpcode() != ISD::Constant)
279 Imm = (short)cast<ConstantSDNode>(N)->getZExtValue();
280 if (N->getValueType(0) == MVT::i32)
281 return Imm == (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
283 return Imm == (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
286 static bool isIntS16Immediate(SDValue Op, short &Imm) {
287 return isIntS16Immediate(Op.getNode(), Imm);
291 /// isInt32Immediate - This method tests to see if the node is a 32-bit constant
292 /// operand. If so Imm will receive the 32-bit value.
293 static bool isInt32Immediate(SDNode *N, unsigned &Imm) {
294 if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) {
295 Imm = cast<ConstantSDNode>(N)->getZExtValue();
301 /// isInt64Immediate - This method tests to see if the node is a 64-bit constant
302 /// operand. If so Imm will receive the 64-bit value.
303 static bool isInt64Immediate(SDNode *N, uint64_t &Imm) {
304 if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i64) {
305 Imm = cast<ConstantSDNode>(N)->getZExtValue();
311 // isInt32Immediate - This method tests to see if a constant operand.
312 // If so Imm will receive the 32 bit value.
313 static bool isInt32Immediate(SDValue N, unsigned &Imm) {
314 return isInt32Immediate(N.getNode(), Imm);
318 // isOpcWithIntImmediate - This method tests to see if the node is a specific
319 // opcode and that it has a immediate integer right operand.
320 // If so Imm will receive the 32 bit value.
321 static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) {
322 return N->getOpcode() == Opc
323 && isInt32Immediate(N->getOperand(1).getNode(), Imm);
326 bool PPCDAGToDAGISel::isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
327 if (isShiftedMask_32(Val)) {
328 // look for the first non-zero bit
329 MB = CountLeadingZeros_32(Val);
330 // look for the first zero bit after the run of ones
331 ME = CountLeadingZeros_32((Val - 1) ^ Val);
334 Val = ~Val; // invert mask
335 if (isShiftedMask_32(Val)) {
336 // effectively look for the first zero bit
337 ME = CountLeadingZeros_32(Val) - 1;
338 // effectively look for the first one bit after the run of zeros
339 MB = CountLeadingZeros_32((Val - 1) ^ Val) + 1;
347 bool PPCDAGToDAGISel::isRotateAndMask(SDNode *N, unsigned Mask,
348 bool isShiftMask, unsigned &SH,
349 unsigned &MB, unsigned &ME) {
350 // Don't even go down this path for i64, since different logic will be
351 // necessary for rldicl/rldicr/rldimi.
352 if (N->getValueType(0) != MVT::i32)
356 unsigned Indeterminant = ~0; // bit mask marking indeterminant results
357 unsigned Opcode = N->getOpcode();
358 if (N->getNumOperands() != 2 ||
359 !isInt32Immediate(N->getOperand(1).getNode(), Shift) || (Shift > 31))
362 if (Opcode == ISD::SHL) {
363 // apply shift left to mask if it comes first
364 if (isShiftMask) Mask = Mask << Shift;
365 // determine which bits are made indeterminant by shift
366 Indeterminant = ~(0xFFFFFFFFu << Shift);
367 } else if (Opcode == ISD::SRL) {
368 // apply shift right to mask if it comes first
369 if (isShiftMask) Mask = Mask >> Shift;
370 // determine which bits are made indeterminant by shift
371 Indeterminant = ~(0xFFFFFFFFu >> Shift);
372 // adjust for the left rotate
374 } else if (Opcode == ISD::ROTL) {
380 // if the mask doesn't intersect any Indeterminant bits
381 if (Mask && !(Mask & Indeterminant)) {
383 // make sure the mask is still a mask (wrap arounds may not be)
384 return isRunOfOnes(Mask, MB, ME);
389 /// SelectBitfieldInsert - turn an or of two masked values into
390 /// the rotate left word immediate then mask insert (rlwimi) instruction.
391 SDNode *PPCDAGToDAGISel::SelectBitfieldInsert(SDNode *N) {
392 SDValue Op0 = N->getOperand(0);
393 SDValue Op1 = N->getOperand(1);
394 DebugLoc dl = N->getDebugLoc();
396 APInt LKZ, LKO, RKZ, RKO;
397 CurDAG->ComputeMaskedBits(Op0, APInt::getAllOnesValue(32), LKZ, LKO);
398 CurDAG->ComputeMaskedBits(Op1, APInt::getAllOnesValue(32), RKZ, RKO);
400 unsigned TargetMask = LKZ.getZExtValue();
401 unsigned InsertMask = RKZ.getZExtValue();
403 if ((TargetMask | InsertMask) == 0xFFFFFFFF) {
404 unsigned Op0Opc = Op0.getOpcode();
405 unsigned Op1Opc = Op1.getOpcode();
406 unsigned Value, SH = 0;
407 TargetMask = ~TargetMask;
408 InsertMask = ~InsertMask;
410 // If the LHS has a foldable shift and the RHS does not, then swap it to the
411 // RHS so that we can fold the shift into the insert.
412 if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) {
413 if (Op0.getOperand(0).getOpcode() == ISD::SHL ||
414 Op0.getOperand(0).getOpcode() == ISD::SRL) {
415 if (Op1.getOperand(0).getOpcode() != ISD::SHL &&
416 Op1.getOperand(0).getOpcode() != ISD::SRL) {
418 std::swap(Op0Opc, Op1Opc);
419 std::swap(TargetMask, InsertMask);
422 } else if (Op0Opc == ISD::SHL || Op0Opc == ISD::SRL) {
423 if (Op1Opc == ISD::AND && Op1.getOperand(0).getOpcode() != ISD::SHL &&
424 Op1.getOperand(0).getOpcode() != ISD::SRL) {
426 std::swap(Op0Opc, Op1Opc);
427 std::swap(TargetMask, InsertMask);
432 if (InsertMask && isRunOfOnes(InsertMask, MB, ME)) {
435 if ((Op1Opc == ISD::SHL || Op1Opc == ISD::SRL) &&
436 isInt32Immediate(Op1.getOperand(1), Value)) {
437 Op1 = Op1.getOperand(0);
438 SH = (Op1Opc == ISD::SHL) ? Value : 32 - Value;
440 if (Op1Opc == ISD::AND) {
441 unsigned SHOpc = Op1.getOperand(0).getOpcode();
442 if ((SHOpc == ISD::SHL || SHOpc == ISD::SRL) &&
443 isInt32Immediate(Op1.getOperand(0).getOperand(1), Value)) {
444 Op1 = Op1.getOperand(0).getOperand(0);
445 SH = (SHOpc == ISD::SHL) ? Value : 32 - Value;
447 Op1 = Op1.getOperand(0);
452 SDValue Ops[] = { Op0, Op1, getI32Imm(SH), getI32Imm(MB),
454 return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops, 5);
460 /// SelectCC - Select a comparison of the specified values with the specified
461 /// condition code, returning the CR# of the expression.
462 SDValue PPCDAGToDAGISel::SelectCC(SDValue LHS, SDValue RHS,
463 ISD::CondCode CC, DebugLoc dl) {
464 // Always select the LHS.
467 if (LHS.getValueType() == MVT::i32) {
469 if (CC == ISD::SETEQ || CC == ISD::SETNE) {
470 if (isInt32Immediate(RHS, Imm)) {
471 // SETEQ/SETNE comparison with 16-bit immediate, fold it.
473 return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
474 getI32Imm(Imm & 0xFFFF)), 0);
475 // If this is a 16-bit signed immediate, fold it.
476 if (isInt<16>((int)Imm))
477 return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
478 getI32Imm(Imm & 0xFFFF)), 0);
480 // For non-equality comparisons, the default code would materialize the
481 // constant, then compare against it, like this:
485 // Since we are just comparing for equality, we can emit this instead:
486 // xoris r0,r3,0x1234
487 // cmplwi cr0,r0,0x5678
489 SDValue Xor(CurDAG->getMachineNode(PPC::XORIS, dl, MVT::i32, LHS,
490 getI32Imm(Imm >> 16)), 0);
491 return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, Xor,
492 getI32Imm(Imm & 0xFFFF)), 0);
495 } else if (ISD::isUnsignedIntSetCC(CC)) {
496 if (isInt32Immediate(RHS, Imm) && isUInt<16>(Imm))
497 return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
498 getI32Imm(Imm & 0xFFFF)), 0);
502 if (isIntS16Immediate(RHS, SImm))
503 return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
504 getI32Imm((int)SImm & 0xFFFF)),
508 } else if (LHS.getValueType() == MVT::i64) {
510 if (CC == ISD::SETEQ || CC == ISD::SETNE) {
511 if (isInt64Immediate(RHS.getNode(), Imm)) {
512 // SETEQ/SETNE comparison with 16-bit immediate, fold it.
514 return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
515 getI32Imm(Imm & 0xFFFF)), 0);
516 // If this is a 16-bit signed immediate, fold it.
518 return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
519 getI32Imm(Imm & 0xFFFF)), 0);
521 // For non-equality comparisons, the default code would materialize the
522 // constant, then compare against it, like this:
526 // Since we are just comparing for equality, we can emit this instead:
527 // xoris r0,r3,0x1234
528 // cmpldi cr0,r0,0x5678
530 if (isUInt<32>(Imm)) {
531 SDValue Xor(CurDAG->getMachineNode(PPC::XORIS8, dl, MVT::i64, LHS,
532 getI64Imm(Imm >> 16)), 0);
533 return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, Xor,
534 getI64Imm(Imm & 0xFFFF)), 0);
538 } else if (ISD::isUnsignedIntSetCC(CC)) {
539 if (isInt64Immediate(RHS.getNode(), Imm) && isUInt<16>(Imm))
540 return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
541 getI64Imm(Imm & 0xFFFF)), 0);
545 if (isIntS16Immediate(RHS, SImm))
546 return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
547 getI64Imm(SImm & 0xFFFF)),
551 } else if (LHS.getValueType() == MVT::f32) {
554 assert(LHS.getValueType() == MVT::f64 && "Unknown vt!");
557 return SDValue(CurDAG->getMachineNode(Opc, dl, MVT::i32, LHS, RHS), 0);
560 static PPC::Predicate getPredicateForSetCC(ISD::CondCode CC) {
566 llvm_unreachable("Should be lowered by legalize!");
567 default: llvm_unreachable("Unknown condition!");
569 case ISD::SETEQ: return PPC::PRED_EQ;
571 case ISD::SETNE: return PPC::PRED_NE;
573 case ISD::SETLT: return PPC::PRED_LT;
575 case ISD::SETLE: return PPC::PRED_LE;
577 case ISD::SETGT: return PPC::PRED_GT;
579 case ISD::SETGE: return PPC::PRED_GE;
580 case ISD::SETO: return PPC::PRED_NU;
581 case ISD::SETUO: return PPC::PRED_UN;
582 // These two are invalid for floating point. Assume we have int.
583 case ISD::SETULT: return PPC::PRED_LT;
584 case ISD::SETUGT: return PPC::PRED_GT;
588 /// getCRIdxForSetCC - Return the index of the condition register field
589 /// associated with the SetCC condition, and whether or not the field is
590 /// treated as inverted. That is, lt = 0; ge = 0 inverted.
592 /// If this returns with Other != -1, then the returned comparison is an or of
593 /// two simpler comparisons. In this case, Invert is guaranteed to be false.
594 static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool &Invert, int &Other) {
598 default: llvm_unreachable("Unknown condition!");
600 case ISD::SETLT: return 0; // Bit #0 = SETOLT
602 case ISD::SETGT: return 1; // Bit #1 = SETOGT
604 case ISD::SETEQ: return 2; // Bit #2 = SETOEQ
605 case ISD::SETUO: return 3; // Bit #3 = SETUO
607 case ISD::SETGE: Invert = true; return 0; // !Bit #0 = SETUGE
609 case ISD::SETLE: Invert = true; return 1; // !Bit #1 = SETULE
611 case ISD::SETNE: Invert = true; return 2; // !Bit #2 = SETUNE
612 case ISD::SETO: Invert = true; return 3; // !Bit #3 = SETO
617 llvm_unreachable("Invalid branch code: should be expanded by legalize");
618 // These are invalid for floating point. Assume integer.
619 case ISD::SETULT: return 0;
620 case ISD::SETUGT: return 1;
625 SDNode *PPCDAGToDAGISel::SelectSETCC(SDNode *N) {
626 DebugLoc dl = N->getDebugLoc();
628 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
629 if (isInt32Immediate(N->getOperand(1), Imm)) {
630 // We can codegen setcc op, imm very efficiently compared to a brcond.
631 // Check for those cases here.
634 SDValue Op = N->getOperand(0);
638 Op = SDValue(CurDAG->getMachineNode(PPC::CNTLZW, dl, MVT::i32, Op), 0);
639 SDValue Ops[] = { Op, getI32Imm(27), getI32Imm(5), getI32Imm(31) };
640 return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
644 SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Flag,
645 Op, getI32Imm(~0U)), 0);
646 return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op,
650 SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
651 return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
655 SDValue(CurDAG->getMachineNode(PPC::NEG, dl, MVT::i32, Op), 0);
656 T = SDValue(CurDAG->getMachineNode(PPC::ANDC, dl, MVT::i32, T, Op), 0);
657 SDValue Ops[] = { T, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
658 return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
661 } else if (Imm == ~0U) { // setcc op, -1
662 SDValue Op = N->getOperand(0);
666 Op = SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Flag,
667 Op, getI32Imm(1)), 0);
668 return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
669 SDValue(CurDAG->getMachineNode(PPC::LI, dl,
674 Op = SDValue(CurDAG->getMachineNode(PPC::NOR, dl, MVT::i32, Op, Op), 0);
675 SDNode *AD = CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Flag,
677 return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, SDValue(AD, 0),
681 SDValue AD = SDValue(CurDAG->getMachineNode(PPC::ADDI, dl, MVT::i32, Op,
683 SDValue AN = SDValue(CurDAG->getMachineNode(PPC::AND, dl, MVT::i32, AD,
685 SDValue Ops[] = { AN, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
686 return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
689 SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
690 Op = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops, 4),
692 return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Op,
701 unsigned Idx = getCRIdxForSetCC(CC, Inv, OtherCondIdx);
702 SDValue CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC, dl);
705 // Force the ccreg into CR7.
706 SDValue CR7Reg = CurDAG->getRegister(PPC::CR7, MVT::i32);
708 SDValue InFlag(0, 0); // Null incoming flag value.
709 CCReg = CurDAG->getCopyToReg(CurDAG->getEntryNode(), dl, CR7Reg, CCReg,
712 if (PPCSubTarget.isGigaProcessor() && OtherCondIdx == -1)
713 IntCR = SDValue(CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32, CR7Reg,
716 IntCR = SDValue(CurDAG->getMachineNode(PPC::MFCR, dl, MVT::i32, CCReg), 0);
718 SDValue Ops[] = { IntCR, getI32Imm((32-(3-Idx)) & 31),
719 getI32Imm(31), getI32Imm(31) };
720 if (OtherCondIdx == -1 && !Inv)
721 return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
723 // Get the specified bit.
725 SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops, 4), 0);
727 assert(OtherCondIdx == -1 && "Can't have split plus negation");
728 return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Tmp, getI32Imm(1));
731 // Otherwise, we have to turn an operation like SETONE -> SETOLT | SETOGT.
732 // We already got the bit for the first part of the comparison (e.g. SETULE).
734 // Get the other bit of the comparison.
735 Ops[1] = getI32Imm((32-(3-OtherCondIdx)) & 31);
737 SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops, 4), 0);
739 return CurDAG->SelectNodeTo(N, PPC::OR, MVT::i32, Tmp, OtherCond);
743 // Select - Convert the specified operand from a target-independent to a
744 // target-specific node if it hasn't already been changed.
745 SDNode *PPCDAGToDAGISel::Select(SDNode *N) {
746 DebugLoc dl = N->getDebugLoc();
747 if (N->isMachineOpcode())
748 return NULL; // Already selected.
750 switch (N->getOpcode()) {
753 case ISD::Constant: {
754 if (N->getValueType(0) == MVT::i64) {
756 int64_t Imm = cast<ConstantSDNode>(N)->getZExtValue();
757 // Assume no remaining bits.
758 unsigned Remainder = 0;
759 // Assume no shift required.
762 // If it can't be represented as a 32 bit value.
763 if (!isInt<32>(Imm)) {
764 Shift = CountTrailingZeros_64(Imm);
765 int64_t ImmSh = static_cast<uint64_t>(Imm) >> Shift;
767 // If the shifted value fits 32 bits.
768 if (isInt<32>(ImmSh)) {
769 // Go with the shifted value.
772 // Still stuck with a 64 bit value.
779 // Intermediate operand.
782 // Handle first 32 bits.
783 unsigned Lo = Imm & 0xFFFF;
784 unsigned Hi = (Imm >> 16) & 0xFFFF;
787 if (isInt<16>(Imm)) {
789 Result = CurDAG->getMachineNode(PPC::LI8, dl, MVT::i64, getI32Imm(Lo));
791 // Handle the Hi bits.
792 unsigned OpC = Hi ? PPC::LIS8 : PPC::LI8;
793 Result = CurDAG->getMachineNode(OpC, dl, MVT::i64, getI32Imm(Hi));
795 Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
796 SDValue(Result, 0), getI32Imm(Lo));
799 Result = CurDAG->getMachineNode(PPC::LIS8, dl, MVT::i64, getI32Imm(Hi));
802 // If no shift, we're done.
803 if (!Shift) return Result;
805 // Shift for next step if the upper 32-bits were not zero.
807 Result = CurDAG->getMachineNode(PPC::RLDICR, dl, MVT::i64,
810 getI32Imm(63 - Shift));
813 // Add in the last bits as required.
814 if ((Hi = (Remainder >> 16) & 0xFFFF)) {
815 Result = CurDAG->getMachineNode(PPC::ORIS8, dl, MVT::i64,
816 SDValue(Result, 0), getI32Imm(Hi));
818 if ((Lo = Remainder & 0xFFFF)) {
819 Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
820 SDValue(Result, 0), getI32Imm(Lo));
829 return SelectSETCC(N);
830 case PPCISD::GlobalBaseReg:
831 return getGlobalBaseReg();
833 case ISD::FrameIndex: {
834 int FI = cast<FrameIndexSDNode>(N)->getIndex();
835 SDValue TFI = CurDAG->getTargetFrameIndex(FI, N->getValueType(0));
836 unsigned Opc = N->getValueType(0) == MVT::i32 ? PPC::ADDI : PPC::ADDI8;
838 return CurDAG->SelectNodeTo(N, Opc, N->getValueType(0), TFI,
840 return CurDAG->getMachineNode(Opc, dl, N->getValueType(0), TFI,
845 SDValue InFlag = N->getOperand(1);
846 // Use MFOCRF if supported.
847 if (PPCSubTarget.isGigaProcessor())
848 return CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32,
849 N->getOperand(0), InFlag);
851 return CurDAG->getMachineNode(PPC::MFCR, dl, MVT::i32, InFlag);
855 // FIXME: since this depends on the setting of the carry flag from the srawi
856 // we should really be making notes about that for the scheduler.
857 // FIXME: It sure would be nice if we could cheaply recognize the
858 // srl/add/sra pattern the dag combiner will generate for this as
859 // sra/addze rather than having to handle sdiv ourselves. oh well.
861 if (isInt32Immediate(N->getOperand(1), Imm)) {
862 SDValue N0 = N->getOperand(0);
863 if ((signed)Imm > 0 && isPowerOf2_32(Imm)) {
865 CurDAG->getMachineNode(PPC::SRAWI, dl, MVT::i32, MVT::Flag,
866 N0, getI32Imm(Log2_32(Imm)));
867 return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
868 SDValue(Op, 0), SDValue(Op, 1));
869 } else if ((signed)Imm < 0 && isPowerOf2_32(-Imm)) {
871 CurDAG->getMachineNode(PPC::SRAWI, dl, MVT::i32, MVT::Flag,
872 N0, getI32Imm(Log2_32(-Imm)));
874 SDValue(CurDAG->getMachineNode(PPC::ADDZE, dl, MVT::i32,
875 SDValue(Op, 0), SDValue(Op, 1)),
877 return CurDAG->SelectNodeTo(N, PPC::NEG, MVT::i32, PT);
881 // Other cases are autogenerated.
886 // Handle preincrement loads.
887 LoadSDNode *LD = cast<LoadSDNode>(N);
888 EVT LoadedVT = LD->getMemoryVT();
890 // Normal loads are handled by code generated from the .td file.
891 if (LD->getAddressingMode() != ISD::PRE_INC)
894 SDValue Offset = LD->getOffset();
895 if (isa<ConstantSDNode>(Offset) ||
896 Offset.getOpcode() == ISD::TargetGlobalAddress) {
899 bool isSExt = LD->getExtensionType() == ISD::SEXTLOAD;
900 if (LD->getValueType(0) != MVT::i64) {
901 // Handle PPC32 integer and normal FP loads.
902 assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
903 switch (LoadedVT.getSimpleVT().SimpleTy) {
904 default: llvm_unreachable("Invalid PPC load type!");
905 case MVT::f64: Opcode = PPC::LFDU; break;
906 case MVT::f32: Opcode = PPC::LFSU; break;
907 case MVT::i32: Opcode = PPC::LWZU; break;
908 case MVT::i16: Opcode = isSExt ? PPC::LHAU : PPC::LHZU; break;
910 case MVT::i8: Opcode = PPC::LBZU; break;
913 assert(LD->getValueType(0) == MVT::i64 && "Unknown load result type!");
914 assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
915 switch (LoadedVT.getSimpleVT().SimpleTy) {
916 default: llvm_unreachable("Invalid PPC load type!");
917 case MVT::i64: Opcode = PPC::LDU; break;
918 case MVT::i32: Opcode = PPC::LWZU8; break;
919 case MVT::i16: Opcode = isSExt ? PPC::LHAU8 : PPC::LHZU8; break;
921 case MVT::i8: Opcode = PPC::LBZU8; break;
925 SDValue Chain = LD->getChain();
926 SDValue Base = LD->getBasePtr();
927 SDValue Ops[] = { Offset, Base, Chain };
929 return CurDAG->getMachineNode(Opcode, dl, LD->getValueType(0),
930 PPCLowering.getPointerTy(),
933 llvm_unreachable("R+R preindex loads not supported yet!");
938 unsigned Imm, Imm2, SH, MB, ME;
940 // If this is an and of a value rotated between 0 and 31 bits and then and'd
941 // with a mask, emit rlwinm
942 if (isInt32Immediate(N->getOperand(1), Imm) &&
943 isRotateAndMask(N->getOperand(0).getNode(), Imm, false, SH, MB, ME)) {
944 SDValue Val = N->getOperand(0).getOperand(0);
945 SDValue Ops[] = { Val, getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
946 return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
948 // If this is just a masked value where the input is not handled above, and
949 // is not a rotate-left (handled by a pattern in the .td file), emit rlwinm
950 if (isInt32Immediate(N->getOperand(1), Imm) &&
951 isRunOfOnes(Imm, MB, ME) &&
952 N->getOperand(0).getOpcode() != ISD::ROTL) {
953 SDValue Val = N->getOperand(0);
954 SDValue Ops[] = { Val, getI32Imm(0), getI32Imm(MB), getI32Imm(ME) };
955 return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
957 // AND X, 0 -> 0, not "rlwinm 32".
958 if (isInt32Immediate(N->getOperand(1), Imm) && (Imm == 0)) {
959 ReplaceUses(SDValue(N, 0), N->getOperand(1));
962 // ISD::OR doesn't get all the bitfield insertion fun.
963 // (and (or x, c1), c2) where isRunOfOnes(~(c1^c2)) is a bitfield insert
964 if (isInt32Immediate(N->getOperand(1), Imm) &&
965 N->getOperand(0).getOpcode() == ISD::OR &&
966 isInt32Immediate(N->getOperand(0).getOperand(1), Imm2)) {
969 if (isRunOfOnes(Imm, MB, ME)) {
970 SDValue Ops[] = { N->getOperand(0).getOperand(0),
971 N->getOperand(0).getOperand(1),
972 getI32Imm(0), getI32Imm(MB),getI32Imm(ME) };
973 return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops, 5);
977 // Other cases are autogenerated.
981 if (N->getValueType(0) == MVT::i32)
982 if (SDNode *I = SelectBitfieldInsert(N))
985 // Other cases are autogenerated.
988 unsigned Imm, SH, MB, ME;
989 if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
990 isRotateAndMask(N, Imm, true, SH, MB, ME)) {
991 SDValue Ops[] = { N->getOperand(0).getOperand(0),
992 getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
993 return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
996 // Other cases are autogenerated.
1000 unsigned Imm, SH, MB, ME;
1001 if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
1002 isRotateAndMask(N, Imm, true, SH, MB, ME)) {
1003 SDValue Ops[] = { N->getOperand(0).getOperand(0),
1004 getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
1005 return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
1008 // Other cases are autogenerated.
1011 case ISD::SELECT_CC: {
1012 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
1014 // Handle the setcc cases here. select_cc lhs, 0, 1, 0, cc
1015 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N->getOperand(1)))
1016 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N->getOperand(2)))
1017 if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N->getOperand(3)))
1018 if (N1C->isNullValue() && N3C->isNullValue() &&
1019 N2C->getZExtValue() == 1ULL && CC == ISD::SETNE &&
1020 // FIXME: Implement this optzn for PPC64.
1021 N->getValueType(0) == MVT::i32) {
1023 CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Flag,
1024 N->getOperand(0), getI32Imm(~0U));
1025 return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32,
1026 SDValue(Tmp, 0), N->getOperand(0),
1030 SDValue CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC, dl);
1031 unsigned BROpc = getPredicateForSetCC(CC);
1033 unsigned SelectCCOp;
1034 if (N->getValueType(0) == MVT::i32)
1035 SelectCCOp = PPC::SELECT_CC_I4;
1036 else if (N->getValueType(0) == MVT::i64)
1037 SelectCCOp = PPC::SELECT_CC_I8;
1038 else if (N->getValueType(0) == MVT::f32)
1039 SelectCCOp = PPC::SELECT_CC_F4;
1040 else if (N->getValueType(0) == MVT::f64)
1041 SelectCCOp = PPC::SELECT_CC_F8;
1043 SelectCCOp = PPC::SELECT_CC_VRRC;
1045 SDValue Ops[] = { CCReg, N->getOperand(2), N->getOperand(3),
1047 return CurDAG->SelectNodeTo(N, SelectCCOp, N->getValueType(0), Ops, 4);
1049 case PPCISD::COND_BRANCH: {
1050 // Op #0 is the Chain.
1051 // Op #1 is the PPC::PRED_* number.
1053 // Op #3 is the Dest MBB
1054 // Op #4 is the Flag.
1055 // Prevent PPC::PRED_* from being selected into LI.
1057 getI32Imm(cast<ConstantSDNode>(N->getOperand(1))->getZExtValue());
1058 SDValue Ops[] = { Pred, N->getOperand(2), N->getOperand(3),
1059 N->getOperand(0), N->getOperand(4) };
1060 return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops, 5);
1063 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
1064 SDValue CondCode = SelectCC(N->getOperand(2), N->getOperand(3), CC, dl);
1065 SDValue Ops[] = { getI32Imm(getPredicateForSetCC(CC)), CondCode,
1066 N->getOperand(4), N->getOperand(0) };
1067 return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops, 4);
1070 // FIXME: Should custom lower this.
1071 SDValue Chain = N->getOperand(0);
1072 SDValue Target = N->getOperand(1);
1073 unsigned Opc = Target.getValueType() == MVT::i32 ? PPC::MTCTR : PPC::MTCTR8;
1074 Chain = SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Other, Target,
1076 return CurDAG->SelectNodeTo(N, PPC::BCTR, MVT::Other, Chain);
1080 return SelectCode(N);
1085 /// createPPCISelDag - This pass converts a legalized DAG into a
1086 /// PowerPC-specific DAG, ready for instruction scheduling.
1088 FunctionPass *llvm::createPPCISelDag(PPCTargetMachine &TM) {
1089 return new PPCDAGToDAGISel(TM);