1 //===-- PPC32ISelDAGToDAG.cpp - PPC32 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 32 bit PowerPC,
11 // converting from a legalized dag to a PPC dag.
13 //===----------------------------------------------------------------------===//
16 #include "PPC32TargetMachine.h"
17 #include "PPC32ISelLowering.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 /// PPC32DAGToDAGISel - PPC32 specific code to select PPC32 machine
37 /// instructions for SelectionDAG operations.
39 class PPC32DAGToDAGISel : public SelectionDAGISel {
40 PPC32TargetLowering PPC32Lowering;
41 unsigned GlobalBaseReg;
43 PPC32DAGToDAGISel(TargetMachine &TM)
44 : SelectionDAGISel(PPC32Lowering), PPC32Lowering(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 *SelectIntImmediateExpr(SDOperand LHS, SDOperand RHS,
67 unsigned OCHi, unsigned OCLo,
68 bool IsArithmetic = false,
70 SDNode *SelectBitfieldInsert(SDNode *N);
72 /// SelectCC - Select a comparison of the specified values with the
73 /// specified condition code, returning the CR# of the expression.
74 SDOperand SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC);
76 /// SelectAddr - Given the specified address, return the two operands for a
77 /// load/store instruction, and return true if it should be an indexed [r+r]
79 bool SelectAddr(SDOperand Addr, SDOperand &Op1, SDOperand &Op2);
81 SDOperand BuildSDIVSequence(SDNode *N);
82 SDOperand BuildUDIVSequence(SDNode *N);
84 /// InstructionSelectBasicBlock - This callback is invoked by
85 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
86 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG) {
88 // Select target instructions for the DAG.
89 Select(DAG.getRoot());
90 DAG.RemoveDeadNodes();
92 // Emit machine code to BB.
93 ScheduleAndEmitDAG(DAG);
96 virtual const char *getPassName() const {
97 return "PowerPC DAG->DAG Pattern Instruction Selection";
102 /// getGlobalBaseReg - Output the instructions required to put the
103 /// base address to use for accessing globals into a register.
105 SDOperand PPC32DAGToDAGISel::getGlobalBaseReg() {
106 if (!GlobalBaseReg) {
107 // Insert the set of GlobalBaseReg into the first MBB of the function
108 MachineBasicBlock &FirstMBB = BB->getParent()->front();
109 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
110 SSARegMap *RegMap = BB->getParent()->getSSARegMap();
111 GlobalBaseReg = RegMap->createVirtualRegister(PPC32::GPRCRegisterClass);
112 BuildMI(FirstMBB, MBBI, PPC::MovePCtoLR, 0, PPC::LR);
113 BuildMI(FirstMBB, MBBI, PPC::MFLR, 1, GlobalBaseReg);
115 return CurDAG->getRegister(GlobalBaseReg, MVT::i32);
119 // isIntImmediate - This method tests to see if a constant operand.
120 // If so Imm will receive the 32 bit value.
121 static bool isIntImmediate(SDNode *N, unsigned& Imm) {
122 if (N->getOpcode() == ISD::Constant) {
123 Imm = cast<ConstantSDNode>(N)->getValue();
129 // isOprShiftImm - Returns true if the specified operand is a shift opcode with
130 // a immediate shift count less than 32.
131 static bool isOprShiftImm(SDNode *N, unsigned& Opc, unsigned& SH) {
132 Opc = N->getOpcode();
133 return (Opc == ISD::SHL || Opc == ISD::SRL || Opc == ISD::SRA) &&
134 isIntImmediate(N->getOperand(1).Val, SH) && SH < 32;
137 // isRunOfOnes - Returns true iff Val consists of one contiguous run of 1s with
138 // any number of 0s on either side. The 1s are allowed to wrap from LSB to
139 // MSB, so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs. 0x0F0F0000 is
140 // not, since all 1s are not contiguous.
141 static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
142 if (isShiftedMask_32(Val)) {
143 // look for the first non-zero bit
144 MB = CountLeadingZeros_32(Val);
145 // look for the first zero bit after the run of ones
146 ME = CountLeadingZeros_32((Val - 1) ^ Val);
149 Val = ~Val; // invert mask
150 if (isShiftedMask_32(Val)) {
151 // effectively look for the first zero bit
152 ME = CountLeadingZeros_32(Val) - 1;
153 // effectively look for the first one bit after the run of zeros
154 MB = CountLeadingZeros_32((Val - 1) ^ Val) + 1;
162 // isRotateAndMask - Returns true if Mask and Shift can be folded in to a rotate
163 // and mask opcode and mask operation.
164 static bool isRotateAndMask(SDNode *N, unsigned Mask, bool IsShiftMask,
165 unsigned &SH, unsigned &MB, unsigned &ME) {
167 unsigned Indeterminant = ~0; // bit mask marking indeterminant results
168 unsigned Opcode = N->getOpcode();
169 if (!isIntImmediate(N->getOperand(1).Val, Shift) || (Shift > 31))
172 if (Opcode == ISD::SHL) {
173 // apply shift left to mask if it comes first
174 if (IsShiftMask) Mask = Mask << Shift;
175 // determine which bits are made indeterminant by shift
176 Indeterminant = ~(0xFFFFFFFFu << Shift);
177 } else if (Opcode == ISD::SRA || Opcode == ISD::SRL) {
178 // apply shift right to mask if it comes first
179 if (IsShiftMask) Mask = Mask >> Shift;
180 // determine which bits are made indeterminant by shift
181 Indeterminant = ~(0xFFFFFFFFu >> Shift);
182 // adjust for the left rotate
188 // if the mask doesn't intersect any Indeterminant bits
189 if (Mask && !(Mask & Indeterminant)) {
191 // make sure the mask is still a mask (wrap arounds may not be)
192 return isRunOfOnes(Mask, MB, ME);
197 // isOpcWithIntImmediate - This method tests to see if the node is a specific
198 // opcode and that it has a immediate integer right operand.
199 // If so Imm will receive the 32 bit value.
200 static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) {
201 return N->getOpcode() == Opc && isIntImmediate(N->getOperand(1).Val, Imm);
204 // isOprNot - Returns true if the specified operand is an xor with immediate -1.
205 static bool isOprNot(SDNode *N) {
207 return isOpcWithIntImmediate(N, ISD::XOR, Imm) && (signed)Imm == -1;
210 // Immediate constant composers.
211 // Lo16 - grabs the lo 16 bits from a 32 bit constant.
212 // Hi16 - grabs the hi 16 bits from a 32 bit constant.
213 // HA16 - computes the hi bits required if the lo bits are add/subtracted in
215 static unsigned Lo16(unsigned x) { return x & 0x0000FFFF; }
216 static unsigned Hi16(unsigned x) { return Lo16(x >> 16); }
217 static unsigned HA16(unsigned x) { return Hi16((signed)x - (signed short)x); }
219 // isIntImmediate - This method tests to see if a constant operand.
220 // If so Imm will receive the 32 bit value.
221 static bool isIntImmediate(SDOperand N, unsigned& Imm) {
222 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
223 Imm = (unsigned)CN->getSignExtended();
229 /// SelectBitfieldInsert - turn an or of two masked values into
230 /// the rotate left word immediate then mask insert (rlwimi) instruction.
231 /// Returns true on success, false if the caller still needs to select OR.
233 /// Patterns matched:
234 /// 1. or shl, and 5. or and, and
235 /// 2. or and, shl 6. or shl, shr
236 /// 3. or shr, and 7. or shr, shl
238 SDNode *PPC32DAGToDAGISel::SelectBitfieldInsert(SDNode *N) {
239 bool IsRotate = false;
240 unsigned TgtMask = 0xFFFFFFFF, InsMask = 0xFFFFFFFF, SH = 0;
243 SDOperand Op0 = N->getOperand(0);
244 SDOperand Op1 = N->getOperand(1);
246 unsigned Op0Opc = Op0.getOpcode();
247 unsigned Op1Opc = Op1.getOpcode();
249 // Verify that we have the correct opcodes
250 if (ISD::SHL != Op0Opc && ISD::SRL != Op0Opc && ISD::AND != Op0Opc)
252 if (ISD::SHL != Op1Opc && ISD::SRL != Op1Opc && ISD::AND != Op1Opc)
255 // Generate Mask value for Target
256 if (isIntImmediate(Op0.getOperand(1), Value)) {
258 case ISD::SHL: TgtMask <<= Value; break;
259 case ISD::SRL: TgtMask >>= Value; break;
260 case ISD::AND: TgtMask &= Value; break;
266 // Generate Mask value for Insert
267 if (isIntImmediate(Op1.getOperand(1), Value)) {
272 if (Op0Opc == ISD::SRL) IsRotate = true;
278 if (Op0Opc == ISD::SHL) IsRotate = true;
288 // If both of the inputs are ANDs and one of them has a logical shift by
289 // constant as its input, make that AND the inserted value so that we can
290 // combine the shift into the rotate part of the rlwimi instruction
291 bool IsAndWithShiftOp = false;
292 if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) {
293 if (Op1.getOperand(0).getOpcode() == ISD::SHL ||
294 Op1.getOperand(0).getOpcode() == ISD::SRL) {
295 if (isIntImmediate(Op1.getOperand(0).getOperand(1), Value)) {
296 SH = Op1.getOperand(0).getOpcode() == ISD::SHL ? Value : 32 - Value;
297 IsAndWithShiftOp = true;
299 } else if (Op0.getOperand(0).getOpcode() == ISD::SHL ||
300 Op0.getOperand(0).getOpcode() == ISD::SRL) {
301 if (isIntImmediate(Op0.getOperand(0).getOperand(1), Value)) {
303 std::swap(TgtMask, InsMask);
304 SH = Op1.getOperand(0).getOpcode() == ISD::SHL ? Value : 32 - Value;
305 IsAndWithShiftOp = true;
310 // Verify that the Target mask and Insert mask together form a full word mask
311 // and that the Insert mask is a run of set bits (which implies both are runs
312 // of set bits). Given that, Select the arguments and generate the rlwimi
315 if (((TgtMask & InsMask) == 0) && isRunOfOnes(InsMask, MB, ME)) {
316 bool fullMask = (TgtMask ^ InsMask) == 0xFFFFFFFF;
317 bool Op0IsAND = Op0Opc == ISD::AND;
318 // Check for rotlwi / rotrwi here, a special case of bitfield insert
319 // where both bitfield halves are sourced from the same value.
320 if (IsRotate && fullMask &&
321 N->getOperand(0).getOperand(0) == N->getOperand(1).getOperand(0)) {
322 Op0 = CurDAG->getTargetNode(PPC::RLWINM, MVT::i32,
323 Select(N->getOperand(0).getOperand(0)),
324 getI32Imm(SH), getI32Imm(0), getI32Imm(31));
327 SDOperand Tmp1 = (Op0IsAND && fullMask) ? Select(Op0.getOperand(0))
329 SDOperand Tmp2 = IsAndWithShiftOp ? Select(Op1.getOperand(0).getOperand(0))
330 : Select(Op1.getOperand(0));
331 Op0 = CurDAG->getTargetNode(PPC::RLWIMI, MVT::i32, Tmp1, Tmp2,
332 getI32Imm(SH), getI32Imm(MB), getI32Imm(ME));
338 // SelectIntImmediateExpr - Choose code for integer operations with an immediate
340 SDNode *PPC32DAGToDAGISel::SelectIntImmediateExpr(SDOperand LHS, SDOperand RHS,
341 unsigned OCHi, unsigned OCLo,
344 // Check to make sure this is a constant.
345 ConstantSDNode *CN = dyn_cast<ConstantSDNode>(RHS);
346 // Exit if not a constant.
348 // Extract immediate.
349 unsigned C = (unsigned)CN->getValue();
350 // Negate if required (ISD::SUB).
352 // Get the hi and lo portions of constant.
353 unsigned Hi = IsArithmetic ? HA16(C) : Hi16(C);
354 unsigned Lo = Lo16(C);
356 // If two instructions are needed and usage indicates it would be better to
357 // load immediate into a register, bail out.
358 if (Hi && Lo && CN->use_size() > 2) return false;
360 // Select the first operand.
361 SDOperand Opr0 = Select(LHS);
363 if (Lo) // Add in the lo-part.
364 Opr0 = CurDAG->getTargetNode(OCLo, MVT::i32, Opr0, getI32Imm(Lo));
365 if (Hi) // Add in the hi-part.
366 Opr0 = CurDAG->getTargetNode(OCHi, MVT::i32, Opr0, getI32Imm(Hi));
370 /// SelectAddr - Given the specified address, return the two operands for a
371 /// load/store instruction, and return true if it should be an indexed [r+r]
373 bool PPC32DAGToDAGISel::SelectAddr(SDOperand Addr, SDOperand &Op1,
376 if (Addr.getOpcode() == ISD::ADD) {
377 if (isIntImmediate(Addr.getOperand(1), imm) && isInt16(imm)) {
378 Op1 = getI32Imm(Lo16(imm));
379 if (FrameIndexSDNode *FI =
380 dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
382 Op2 = CurDAG->getTargetFrameIndex(FI->getIndex(), MVT::i32);
384 Op2 = Select(Addr.getOperand(0));
388 Op1 = Select(Addr.getOperand(0));
389 Op2 = Select(Addr.getOperand(1));
390 return true; // [r+r]
394 // Now check if we're dealing with a global, and whether or not we should emit
395 // an optimized load or store for statics.
396 if (GlobalAddressSDNode *GN = dyn_cast<GlobalAddressSDNode>(Addr)) {
397 GlobalValue *GV = GN->getGlobal();
398 if (!GV->hasWeakLinkage() && !GV->isExternal()) {
399 Op1 = CurDAG->getTargetGlobalAddress(GV, MVT::i32);
401 Op2 = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(),
404 Op2 = CurDAG->getTargetNode(PPC::LIS, MVT::i32, Op1);
407 } else if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Addr)) {
409 Op2 = CurDAG->getTargetFrameIndex(FI->getIndex(), MVT::i32);
411 } else if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Addr)) {
414 Op2 = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(),Op1);
416 Op2 = CurDAG->getTargetNode(PPC::LIS, MVT::i32, Op1);
424 /// SelectCC - Select a comparison of the specified values with the specified
425 /// condition code, returning the CR# of the expression.
426 SDOperand PPC32DAGToDAGISel::SelectCC(SDOperand LHS, SDOperand RHS,
428 // Always select the LHS.
431 // Use U to determine whether the SETCC immediate range is signed or not.
432 if (MVT::isInteger(LHS.getValueType())) {
433 bool U = ISD::isUnsignedIntSetCC(CC);
435 if (isIntImmediate(RHS, Imm) &&
436 ((U && isUInt16(Imm)) || (!U && isInt16(Imm))))
437 return CurDAG->getTargetNode(U ? PPC::CMPLWI : PPC::CMPWI, MVT::i32,
438 LHS, getI32Imm(Lo16(Imm)));
439 return CurDAG->getTargetNode(U ? PPC::CMPLW : PPC::CMPW, MVT::i32,
442 return CurDAG->getTargetNode(PPC::FCMPU, MVT::i32, LHS, Select(RHS));
446 /// getBCCForSetCC - Returns the PowerPC condition branch mnemonic corresponding
448 static unsigned getBCCForSetCC(ISD::CondCode CC) {
450 default: assert(0 && "Unknown condition!"); abort();
451 case ISD::SETEQ: return PPC::BEQ;
452 case ISD::SETNE: return PPC::BNE;
454 case ISD::SETLT: return PPC::BLT;
456 case ISD::SETLE: return PPC::BLE;
458 case ISD::SETGT: return PPC::BGT;
460 case ISD::SETGE: return PPC::BGE;
465 /// getCRIdxForSetCC - Return the index of the condition register field
466 /// associated with the SetCC condition, and whether or not the field is
467 /// treated as inverted. That is, lt = 0; ge = 0 inverted.
468 static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool& Inv) {
470 default: assert(0 && "Unknown condition!"); abort();
472 case ISD::SETLT: Inv = false; return 0;
474 case ISD::SETGE: Inv = true; return 0;
476 case ISD::SETGT: Inv = false; return 1;
478 case ISD::SETLE: Inv = true; return 1;
479 case ISD::SETEQ: Inv = false; return 2;
480 case ISD::SETNE: Inv = true; return 2;
485 // Structure used to return the necessary information to codegen an SDIV as
488 int m; // magic number
489 int s; // shift amount
493 unsigned int m; // magic number
494 int a; // add indicator
495 int s; // shift amount
498 /// magic - calculate the magic numbers required to codegen an integer sdiv as
499 /// a sequence of multiply and shifts. Requires that the divisor not be 0, 1,
501 static struct ms magic(int d) {
503 unsigned int ad, anc, delta, q1, r1, q2, r2, t;
504 const unsigned int two31 = 0x80000000U;
508 t = two31 + ((unsigned int)d >> 31);
509 anc = t - 1 - t%ad; // absolute value of nc
510 p = 31; // initialize p
511 q1 = two31/anc; // initialize q1 = 2p/abs(nc)
512 r1 = two31 - q1*anc; // initialize r1 = rem(2p,abs(nc))
513 q2 = two31/ad; // initialize q2 = 2p/abs(d)
514 r2 = two31 - q2*ad; // initialize r2 = rem(2p,abs(d))
517 q1 = 2*q1; // update q1 = 2p/abs(nc)
518 r1 = 2*r1; // update r1 = rem(2p/abs(nc))
519 if (r1 >= anc) { // must be unsigned comparison
523 q2 = 2*q2; // update q2 = 2p/abs(d)
524 r2 = 2*r2; // update r2 = rem(2p/abs(d))
525 if (r2 >= ad) { // must be unsigned comparison
530 } while (q1 < delta || (q1 == delta && r1 == 0));
533 if (d < 0) mag.m = -mag.m; // resulting magic number
534 mag.s = p - 32; // resulting shift
538 /// magicu - calculate the magic numbers required to codegen an integer udiv as
539 /// a sequence of multiply, add and shifts. Requires that the divisor not be 0.
540 static struct mu magicu(unsigned d)
543 unsigned int nc, delta, q1, r1, q2, r2;
545 magu.a = 0; // initialize "add" indicator
547 p = 31; // initialize p
548 q1 = 0x80000000/nc; // initialize q1 = 2p/nc
549 r1 = 0x80000000 - q1*nc; // initialize r1 = rem(2p,nc)
550 q2 = 0x7FFFFFFF/d; // initialize q2 = (2p-1)/d
551 r2 = 0x7FFFFFFF - q2*d; // initialize r2 = rem((2p-1),d)
554 if (r1 >= nc - r1 ) {
555 q1 = 2*q1 + 1; // update q1
556 r1 = 2*r1 - nc; // update r1
559 q1 = 2*q1; // update q1
560 r1 = 2*r1; // update r1
562 if (r2 + 1 >= d - r2) {
563 if (q2 >= 0x7FFFFFFF) magu.a = 1;
564 q2 = 2*q2 + 1; // update q2
565 r2 = 2*r2 + 1 - d; // update r2
568 if (q2 >= 0x80000000) magu.a = 1;
569 q2 = 2*q2; // update q2
570 r2 = 2*r2 + 1; // update r2
573 } while (p < 64 && (q1 < delta || (q1 == delta && r1 == 0)));
574 magu.m = q2 + 1; // resulting magic number
575 magu.s = p - 32; // resulting shift
579 /// BuildSDIVSequence - Given an ISD::SDIV node expressing a divide by constant,
580 /// return a DAG expression to select that will generate the same value by
581 /// multiplying by a magic number. See:
582 /// <http://the.wall.riscom.net/books/proc/ppc/cwg/code2.html>
583 SDOperand PPC32DAGToDAGISel::BuildSDIVSequence(SDNode *N) {
584 int d = (int)cast<ConstantSDNode>(N->getOperand(1))->getValue();
585 ms magics = magic(d);
586 // Multiply the numerator (operand 0) by the magic value
587 SDOperand Q = CurDAG->getNode(ISD::MULHS, MVT::i32, N->getOperand(0),
588 CurDAG->getConstant(magics.m, MVT::i32));
589 // If d > 0 and m < 0, add the numerator
590 if (d > 0 && magics.m < 0)
591 Q = CurDAG->getNode(ISD::ADD, MVT::i32, Q, N->getOperand(0));
592 // If d < 0 and m > 0, subtract the numerator.
593 if (d < 0 && magics.m > 0)
594 Q = CurDAG->getNode(ISD::SUB, MVT::i32, Q, N->getOperand(0));
595 // Shift right algebraic if shift value is nonzero
597 Q = CurDAG->getNode(ISD::SRA, MVT::i32, Q,
598 CurDAG->getConstant(magics.s, MVT::i32));
599 // Extract the sign bit and add it to the quotient
601 CurDAG->getNode(ISD::SRL, MVT::i32, Q, CurDAG->getConstant(31, MVT::i32));
602 return CurDAG->getNode(ISD::ADD, MVT::i32, Q, T);
605 /// BuildUDIVSequence - Given an ISD::UDIV node expressing a divide by constant,
606 /// return a DAG expression to select that will generate the same value by
607 /// multiplying by a magic number. See:
608 /// <http://the.wall.riscom.net/books/proc/ppc/cwg/code2.html>
609 SDOperand PPC32DAGToDAGISel::BuildUDIVSequence(SDNode *N) {
610 unsigned d = (unsigned)cast<ConstantSDNode>(N->getOperand(1))->getValue();
611 mu magics = magicu(d);
612 // Multiply the numerator (operand 0) by the magic value
613 SDOperand Q = CurDAG->getNode(ISD::MULHU, MVT::i32, N->getOperand(0),
614 CurDAG->getConstant(magics.m, MVT::i32));
616 return CurDAG->getNode(ISD::SRL, MVT::i32, Q,
617 CurDAG->getConstant(magics.s, MVT::i32));
619 SDOperand NPQ = CurDAG->getNode(ISD::SUB, MVT::i32, N->getOperand(0), Q);
620 NPQ = CurDAG->getNode(ISD::SRL, MVT::i32, NPQ,
621 CurDAG->getConstant(1, MVT::i32));
622 NPQ = CurDAG->getNode(ISD::ADD, MVT::i32, NPQ, Q);
623 return CurDAG->getNode(ISD::SRL, MVT::i32, NPQ,
624 CurDAG->getConstant(magics.s-1, MVT::i32));
628 // Select - Convert the specified operand from a target-independent to a
629 // target-specific node if it hasn't already been changed.
630 SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
632 if (N->getOpcode() >= ISD::BUILTIN_OP_END)
633 return Op; // Already selected.
635 switch (N->getOpcode()) {
637 std::cerr << "Cannot yet select: ";
641 case ISD::EntryToken: // These leaves remain the same.
643 case ISD::TokenFactor: {
645 if (N->getNumOperands() == 2) {
646 SDOperand Op0 = Select(N->getOperand(0));
647 SDOperand Op1 = Select(N->getOperand(1));
648 New = CurDAG->getNode(ISD::TokenFactor, MVT::Other, Op0, Op1);
650 std::vector<SDOperand> Ops;
651 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
652 Ops.push_back(Select(N->getOperand(i)));
653 New = CurDAG->getNode(ISD::TokenFactor, MVT::Other, Ops);
657 CurDAG->ReplaceAllUsesWith(Op, New);
662 case ISD::CopyFromReg: {
663 SDOperand Chain = Select(N->getOperand(0));
664 if (Chain == N->getOperand(0)) return Op; // No change
665 SDOperand New = CurDAG->getCopyFromReg(Chain,
666 cast<RegisterSDNode>(N->getOperand(1))->getReg(), N->getValueType(0));
667 return New.getValue(Op.ResNo);
669 case ISD::CopyToReg: {
670 SDOperand Chain = Select(N->getOperand(0));
671 SDOperand Reg = N->getOperand(1);
672 SDOperand Val = Select(N->getOperand(2));
673 if (Chain != N->getOperand(0) || Val != N->getOperand(2)) {
674 SDOperand New = CurDAG->getNode(ISD::CopyToReg, MVT::Other,
676 CurDAG->ReplaceAllUsesWith(Op, New);
681 case ISD::Constant: {
682 assert(N->getValueType(0) == MVT::i32);
683 unsigned v = (unsigned)cast<ConstantSDNode>(N)->getValue();
684 unsigned Hi = HA16(v);
685 unsigned Lo = Lo16(v);
687 SDOperand Top = CurDAG->getTargetNode(PPC::LIS, MVT::i32,
689 CurDAG->SelectNodeTo(N, PPC::ORI, MVT::i32, Top, getI32Imm(v & 0xFFFF));
691 CurDAG->SelectNodeTo(N, PPC::LI, MVT::i32, getI32Imm(v));
693 CurDAG->SelectNodeTo(N, PPC::LIS, MVT::i32, getI32Imm(v >> 16));
698 if (N->getValueType(0) == MVT::i32)
699 CurDAG->SelectNodeTo(N, PPC::IMPLICIT_DEF_GPR, MVT::i32);
701 CurDAG->SelectNodeTo(N, PPC::IMPLICIT_DEF_FP, N->getValueType(0));
703 case ISD::FrameIndex: {
704 int FI = cast<FrameIndexSDNode>(N)->getIndex();
705 CurDAG->SelectNodeTo(N, PPC::ADDI, MVT::i32,
706 CurDAG->getTargetFrameIndex(FI, MVT::i32),
710 case ISD::ConstantPool: {
711 Constant *C = cast<ConstantPoolSDNode>(N)->get();
712 SDOperand Tmp, CPI = CurDAG->getTargetConstantPool(C, MVT::i32);
714 Tmp = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(),CPI);
716 Tmp = CurDAG->getTargetNode(PPC::LIS, MVT::i32, CPI);
717 CurDAG->SelectNodeTo(N, PPC::LA, MVT::i32, Tmp, CPI);
720 case ISD::GlobalAddress: {
721 GlobalValue *GV = cast<GlobalAddressSDNode>(N)->getGlobal();
723 SDOperand GA = CurDAG->getTargetGlobalAddress(GV, MVT::i32);
725 Tmp = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(), GA);
727 Tmp = CurDAG->getTargetNode(PPC::LIS, MVT::i32, GA);
729 if (GV->hasWeakLinkage() || GV->isExternal())
730 CurDAG->SelectNodeTo(N, PPC::LWZ, MVT::i32, GA, Tmp);
732 CurDAG->SelectNodeTo(N, PPC::LA, MVT::i32, Tmp, GA);
735 case ISD::SIGN_EXTEND_INREG:
736 switch(cast<VTSDNode>(N->getOperand(1))->getVT()) {
737 default: assert(0 && "Illegal type in SIGN_EXTEND_INREG"); break;
739 CurDAG->SelectNodeTo(N, PPC::EXTSH, MVT::i32, Select(N->getOperand(0)));
742 CurDAG->SelectNodeTo(N, PPC::EXTSB, MVT::i32, Select(N->getOperand(0)));
747 assert(N->getValueType(0) == MVT::i32);
748 CurDAG->SelectNodeTo(N, PPC::CNTLZW, MVT::i32, Select(N->getOperand(0)));
751 MVT::ValueType Ty = N->getValueType(0);
752 if (Ty == MVT::i32) {
753 if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0), N->getOperand(1),
754 PPC::ADDIS, PPC::ADDI, true)) {
755 CurDAG->ReplaceAllUsesWith(Op, SDOperand(I, 0));
758 CurDAG->SelectNodeTo(N, PPC::ADD, MVT::i32, Select(N->getOperand(0)),
759 Select(N->getOperand(1)));
764 if (!NoExcessFPPrecision) { // Match FMA ops
765 if (N->getOperand(0).getOpcode() == ISD::MUL &&
766 N->getOperand(0).Val->hasOneUse()) {
767 ++FusedFP; // Statistic
768 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FMADD : PPC::FMADDS, Ty,
769 Select(N->getOperand(0).getOperand(0)),
770 Select(N->getOperand(0).getOperand(1)),
771 Select(N->getOperand(1)));
773 } else if (N->getOperand(1).getOpcode() == ISD::MUL &&
774 N->getOperand(1).hasOneUse()) {
775 ++FusedFP; // Statistic
776 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FMADD : PPC::FMADDS, Ty,
777 Select(N->getOperand(1).getOperand(0)),
778 Select(N->getOperand(1).getOperand(1)),
779 Select(N->getOperand(0)));
784 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FADD : PPC::FADDS, Ty,
785 Select(N->getOperand(0)), Select(N->getOperand(1)));
789 MVT::ValueType Ty = N->getValueType(0);
790 if (Ty == MVT::i32) {
792 if (isIntImmediate(N->getOperand(0), Imm) && isInt16(Imm)) {
794 CurDAG->SelectNodeTo(N, PPC::NEG, Ty, Select(N->getOperand(1)));
796 CurDAG->SelectNodeTo(N, PPC::SUBFIC, Ty, Select(N->getOperand(1)),
797 getI32Imm(Lo16(Imm)));
800 if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0), N->getOperand(1),
801 PPC::ADDIS, PPC::ADDI, true, true)) {
802 CurDAG->ReplaceAllUsesWith(Op, SDOperand(I, 0));
805 CurDAG->SelectNodeTo(N, PPC::SUBF, Ty, Select(N->getOperand(1)),
806 Select(N->getOperand(0)));
811 if (!NoExcessFPPrecision) { // Match FMA ops
812 if (N->getOperand(0).getOpcode() == ISD::MUL &&
813 N->getOperand(0).Val->hasOneUse()) {
814 ++FusedFP; // Statistic
815 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FMSUB : PPC::FMSUBS, Ty,
816 Select(N->getOperand(0).getOperand(0)),
817 Select(N->getOperand(0).getOperand(1)),
818 Select(N->getOperand(1)));
820 } else if (N->getOperand(1).getOpcode() == ISD::MUL &&
821 N->getOperand(1).Val->hasOneUse()) {
822 ++FusedFP; // Statistic
823 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FNMSUB : PPC::FNMSUBS, Ty,
824 Select(N->getOperand(1).getOperand(0)),
825 Select(N->getOperand(1).getOperand(1)),
826 Select(N->getOperand(0)));
830 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FSUB : PPC::FSUBS, Ty,
831 Select(N->getOperand(0)),
832 Select(N->getOperand(1)));
837 if (isIntImmediate(N->getOperand(1), Imm) && isInt16(Imm)) {
838 CurDAG->SelectNodeTo(N, PPC::MULLI, MVT::i32,
839 Select(N->getOperand(0)), getI32Imm(Lo16(Imm)));
842 switch (N->getValueType(0)) {
843 default: assert(0 && "Unhandled multiply type!");
844 case MVT::i32: Opc = PPC::MULLW; break;
845 case MVT::f32: Opc = PPC::FMULS; break;
846 case MVT::f64: Opc = PPC::FMUL; break;
848 CurDAG->SelectNodeTo(N, Opc, N->getValueType(0), Select(N->getOperand(0)),
849 Select(N->getOperand(1)));
854 if (isIntImmediate(N->getOperand(1), Imm)) {
855 if ((signed)Imm > 0 && isPowerOf2_32(Imm)) {
857 CurDAG->getTargetNode(PPC::SRAWI, MVT::i32, MVT::Flag,
858 Select(N->getOperand(0)),
859 getI32Imm(Log2_32(Imm)));
860 CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
861 Op.getValue(0), Op.getValue(1));
863 } else if ((signed)Imm < 0 && isPowerOf2_32(-Imm)) {
865 CurDAG->getTargetNode(PPC::SRAWI, MVT::Flag, MVT::i32,
866 Select(N->getOperand(0)),
867 getI32Imm(Log2_32(-Imm)));
869 CurDAG->getTargetNode(PPC::ADDZE, MVT::i32, Op.getValue(1),
871 CurDAG->SelectNodeTo(N, PPC::NEG, MVT::i32, PT);
874 SDOperand Result = Select(BuildSDIVSequence(N));
875 assert(Result.ResNo == 0);
876 CurDAG->ReplaceAllUsesWith(Op, Result);
883 switch (N->getValueType(0)) {
884 default: assert(0 && "Unknown type to ISD::SDIV");
885 case MVT::i32: Opc = PPC::DIVW; break;
886 case MVT::f32: Opc = PPC::FDIVS; break;
887 case MVT::f64: Opc = PPC::FDIV; break;
889 CurDAG->SelectNodeTo(N, Opc, N->getValueType(0), Select(N->getOperand(0)),
890 Select(N->getOperand(1)));
894 // If this is a divide by constant, we can emit code using some magic
895 // constants to implement it as a multiply instead.
897 if (isIntImmediate(N->getOperand(1), Imm) && Imm) {
898 SDOperand Result = Select(BuildUDIVSequence(N));
899 assert(Result.ResNo == 0);
900 CurDAG->ReplaceAllUsesWith(Op, Result);
905 CurDAG->SelectNodeTo(N, PPC::DIVWU, MVT::i32, Select(N->getOperand(0)),
906 Select(N->getOperand(1)));
910 assert(N->getValueType(0) == MVT::i32);
911 CurDAG->SelectNodeTo(N, PPC::MULHW, MVT::i32, Select(N->getOperand(0)),
912 Select(N->getOperand(1)));
915 assert(N->getValueType(0) == MVT::i32);
916 CurDAG->SelectNodeTo(N, PPC::MULHWU, MVT::i32, Select(N->getOperand(0)),
917 Select(N->getOperand(1)));
921 // If this is an and of a value rotated between 0 and 31 bits and then and'd
922 // with a mask, emit rlwinm
923 if (isIntImmediate(N->getOperand(1), Imm) && (isShiftedMask_32(Imm) ||
924 isShiftedMask_32(~Imm))) {
927 if (isRotateAndMask(N->getOperand(0).Val, Imm, false, SH, MB, ME)) {
928 Val = Select(N->getOperand(0).getOperand(0));
930 Val = Select(N->getOperand(0));
931 isRunOfOnes(Imm, MB, ME);
934 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Val, getI32Imm(SH),
935 getI32Imm(MB), getI32Imm(ME));
938 // If this is an and with an immediate that isn't a mask, then codegen it as
939 // high and low 16 bit immediate ands.
940 if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0),
942 PPC::ANDISo, PPC::ANDIo)) {
943 CurDAG->ReplaceAllUsesWith(Op, SDOperand(I, 0));
947 // Finally, check for the case where we are being asked to select
948 // and (not(a), b) or and (a, not(b)) which can be selected as andc.
949 if (isOprNot(N->getOperand(0).Val))
950 CurDAG->SelectNodeTo(N, PPC::ANDC, MVT::i32, Select(N->getOperand(1)),
951 Select(N->getOperand(0).getOperand(0)));
952 else if (isOprNot(N->getOperand(1).Val))
953 CurDAG->SelectNodeTo(N, PPC::ANDC, MVT::i32, Select(N->getOperand(0)),
954 Select(N->getOperand(1).getOperand(0)));
956 CurDAG->SelectNodeTo(N, PPC::AND, MVT::i32, Select(N->getOperand(0)),
957 Select(N->getOperand(1)));
961 if (SDNode *I = SelectBitfieldInsert(N)) {
962 CurDAG->ReplaceAllUsesWith(Op, SDOperand(I, 0));
966 if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0),
968 PPC::ORIS, PPC::ORI)) {
969 CurDAG->ReplaceAllUsesWith(Op, SDOperand(I, 0));
973 // Finally, check for the case where we are being asked to select
974 // 'or (not(a), b)' or 'or (a, not(b))' which can be selected as orc.
975 if (isOprNot(N->getOperand(0).Val))
976 CurDAG->SelectNodeTo(N, PPC::ORC, MVT::i32, Select(N->getOperand(1)),
977 Select(N->getOperand(0).getOperand(0)));
978 else if (isOprNot(N->getOperand(1).Val))
979 CurDAG->SelectNodeTo(N, PPC::ORC, MVT::i32, Select(N->getOperand(0)),
980 Select(N->getOperand(1).getOperand(0)));
982 CurDAG->SelectNodeTo(N, PPC::OR, MVT::i32, Select(N->getOperand(0)),
983 Select(N->getOperand(1)));
986 // Check whether or not this node is a logical 'not'. This is represented
987 // by llvm as a xor with the constant value -1 (all bits set). If this is a
988 // 'not', then fold 'or' into 'nor', and so forth for the supported ops.
991 SDOperand Val = Select(N->getOperand(0));
992 switch (Val.getTargetOpcode()) {
993 default: Opc = 0; break;
994 case PPC::OR: Opc = PPC::NOR; break;
995 case PPC::AND: Opc = PPC::NAND; break;
996 case PPC::XOR: Opc = PPC::EQV; break;
999 CurDAG->SelectNodeTo(N, Opc, MVT::i32, Val.getOperand(0),
1002 CurDAG->SelectNodeTo(N, PPC::NOR, MVT::i32, Val, Val);
1005 // If this is a xor with an immediate other than -1, then codegen it as high
1006 // and low 16 bit immediate xors.
1007 if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0),
1009 PPC::XORIS, PPC::XORI)) {
1010 CurDAG->ReplaceAllUsesWith(Op, SDOperand(I, 0));
1014 // Finally, check for the case where we are being asked to select
1015 // xor (not(a), b) which is equivalent to not(xor a, b), which is eqv
1016 if (isOprNot(N->getOperand(0).Val))
1017 CurDAG->SelectNodeTo(N, PPC::EQV, MVT::i32,
1018 Select(N->getOperand(0).getOperand(0)),
1019 Select(N->getOperand(1)));
1021 CurDAG->SelectNodeTo(N, PPC::XOR, MVT::i32, Select(N->getOperand(0)),
1022 Select(N->getOperand(1)));
1025 unsigned Imm, SH, MB, ME;
1026 if (isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) &&
1027 isRotateAndMask(N, Imm, true, SH, MB, ME))
1028 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32,
1029 Select(N->getOperand(0).getOperand(0)),
1030 getI32Imm(SH), getI32Imm(MB), getI32Imm(ME));
1031 else if (isIntImmediate(N->getOperand(1), Imm))
1032 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Select(N->getOperand(0)),
1033 getI32Imm(Imm), getI32Imm(0), getI32Imm(31-Imm));
1035 CurDAG->SelectNodeTo(N, PPC::SLW, MVT::i32, Select(N->getOperand(0)),
1036 Select(N->getOperand(1)));
1040 unsigned Imm, SH, MB, ME;
1041 if (isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) &&
1042 isRotateAndMask(N, Imm, true, SH, MB, ME))
1043 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32,
1044 Select(N->getOperand(0).getOperand(0)),
1045 getI32Imm(SH), getI32Imm(MB), getI32Imm(ME));
1046 else if (isIntImmediate(N->getOperand(1), Imm))
1047 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Select(N->getOperand(0)),
1048 getI32Imm(32-Imm), getI32Imm(Imm), getI32Imm(31));
1050 CurDAG->SelectNodeTo(N, PPC::SRW, MVT::i32, Select(N->getOperand(0)),
1051 Select(N->getOperand(1)));
1055 unsigned Imm, SH, MB, ME;
1056 if (isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) &&
1057 isRotateAndMask(N, Imm, true, SH, MB, ME))
1058 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32,
1059 Select(N->getOperand(0).getOperand(0)),
1060 getI32Imm(SH), getI32Imm(MB), getI32Imm(ME));
1061 else if (isIntImmediate(N->getOperand(1), Imm))
1062 CurDAG->SelectNodeTo(N, PPC::SRAWI, MVT::i32, Select(N->getOperand(0)),
1065 CurDAG->SelectNodeTo(N, PPC::SRAW, MVT::i32, Select(N->getOperand(0)),
1066 Select(N->getOperand(1)));
1070 CurDAG->SelectNodeTo(N, PPC::FABS, N->getValueType(0),
1071 Select(N->getOperand(0)));
1073 case ISD::FP_EXTEND: {
1074 assert(MVT::f64 == N->getValueType(0) &&
1075 MVT::f32 == N->getOperand(0).getValueType() && "Illegal FP_EXTEND");
1076 SDOperand Tmp = Select(N->getOperand(0));
1077 CurDAG->ReplaceAllUsesWith(Op, Tmp); // Just use the operand as the result.
1081 assert(MVT::f32 == N->getValueType(0) &&
1082 MVT::f64 == N->getOperand(0).getValueType() && "Illegal FP_ROUND");
1083 CurDAG->SelectNodeTo(N, PPC::FRSP, MVT::f32, Select(N->getOperand(0)));
1086 SDOperand Val = Select(N->getOperand(0));
1087 MVT::ValueType Ty = N->getValueType(0);
1088 if (Val.Val->hasOneUse()) {
1090 switch (Val.getTargetOpcode()) {
1091 default: Opc = 0; break;
1092 case PPC::FABS: Opc = PPC::FNABS; break;
1093 case PPC::FMADD: Opc = PPC::FNMADD; break;
1094 case PPC::FMADDS: Opc = PPC::FNMADDS; break;
1095 case PPC::FMSUB: Opc = PPC::FNMSUB; break;
1096 case PPC::FMSUBS: Opc = PPC::FNMSUBS; break;
1098 // If we inverted the opcode, then emit the new instruction with the
1099 // inverted opcode and the original instruction's operands. Otherwise,
1100 // fall through and generate a fneg instruction.
1102 if (PPC::FNABS == Opc)
1103 CurDAG->SelectNodeTo(N, Opc, Ty, Val.getOperand(0));
1105 CurDAG->SelectNodeTo(N, Opc, Ty, Val.getOperand(0),
1106 Val.getOperand(1), Val.getOperand(2));
1110 CurDAG->SelectNodeTo(N, PPC::FNEG, Ty, Val);
1114 MVT::ValueType Ty = N->getValueType(0);
1115 CurDAG->SelectNodeTo(N, Ty == MVT::f64 ? PPC::FSQRT : PPC::FSQRTS, Ty,
1116 Select(N->getOperand(0)));
1120 case ISD::ADD_PARTS: {
1121 SDOperand LHSL = Select(N->getOperand(0));
1122 SDOperand LHSH = Select(N->getOperand(1));
1125 bool ME = false, ZE = false;
1126 if (isIntImmediate(N->getOperand(3), Imm)) {
1127 ME = (signed)Imm == -1;
1131 std::vector<SDOperand> Result;
1132 SDOperand CarryFromLo;
1133 if (isIntImmediate(N->getOperand(2), Imm) &&
1134 ((signed)Imm >= -32768 || (signed)Imm < 32768)) {
1135 // Codegen the low 32 bits of the add. Interestingly, there is no
1136 // shifted form of add immediate carrying.
1137 CarryFromLo = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag,
1138 LHSL, getI32Imm(Imm));
1140 CarryFromLo = CurDAG->getTargetNode(PPC::ADDC, MVT::i32, MVT::Flag,
1141 LHSL, Select(N->getOperand(2)));
1143 CarryFromLo = CarryFromLo.getValue(1);
1145 // Codegen the high 32 bits, adding zero, minus one, or the full value
1146 // along with the carry flag produced by addc/addic.
1149 ResultHi = CurDAG->getTargetNode(PPC::ADDZE, MVT::i32, LHSH, CarryFromLo);
1151 ResultHi = CurDAG->getTargetNode(PPC::ADDME, MVT::i32, LHSH, CarryFromLo);
1153 ResultHi = CurDAG->getTargetNode(PPC::ADDE, MVT::i32, LHSH,
1154 Select(N->getOperand(3)), CarryFromLo);
1155 Result.push_back(ResultHi);
1156 Result.push_back(CarryFromLo.getValue(0));
1157 CurDAG->ReplaceAllUsesWith(N, Result);
1158 return Result[Op.ResNo];
1160 case ISD::SUB_PARTS: {
1161 SDOperand LHSL = Select(N->getOperand(0));
1162 SDOperand LHSH = Select(N->getOperand(1));
1163 SDOperand RHSL = Select(N->getOperand(2));
1164 SDOperand RHSH = Select(N->getOperand(3));
1166 std::vector<SDOperand> Result;
1167 Result.push_back(CurDAG->getTargetNode(PPC::SUBFC, MVT::i32, MVT::Flag,
1169 Result.push_back(CurDAG->getTargetNode(PPC::SUBFE, MVT::i32, RHSH, LHSH,
1170 Result[0].getValue(1)));
1171 CurDAG->ReplaceAllUsesWith(N, Result);
1172 return Result[Op.ResNo];
1174 case ISD::SHL_PARTS: {
1175 SDOperand HI = Select(N->getOperand(0));
1176 SDOperand LO = Select(N->getOperand(1));
1177 SDOperand SH = Select(N->getOperand(2));
1178 SDOperand SH_LO_R = CurDAG->getTargetNode(PPC::SUBFIC, MVT::i32, MVT::Flag,
1180 SDOperand SH_LO_L = CurDAG->getTargetNode(PPC::ADDI, MVT::i32, SH,
1181 getI32Imm((unsigned)-32));
1182 SDOperand HI_SHL = CurDAG->getTargetNode(PPC::SLW, MVT::i32, HI, SH);
1183 SDOperand HI_LOR = CurDAG->getTargetNode(PPC::SRW, MVT::i32, LO, SH_LO_R);
1184 SDOperand HI_LOL = CurDAG->getTargetNode(PPC::SLW, MVT::i32, LO, SH_LO_L);
1185 SDOperand HI_OR = CurDAG->getTargetNode(PPC::OR, MVT::i32, HI_SHL, HI_LOR);
1187 std::vector<SDOperand> Result;
1188 Result.push_back(CurDAG->getTargetNode(PPC::SLW, MVT::i32, LO, SH));
1189 Result.push_back(CurDAG->getTargetNode(PPC::OR, MVT::i32, HI_OR, HI_LOL));
1190 CurDAG->ReplaceAllUsesWith(N, Result);
1191 return Result[Op.ResNo];
1193 case ISD::SRL_PARTS: {
1194 SDOperand HI = Select(N->getOperand(0));
1195 SDOperand LO = Select(N->getOperand(1));
1196 SDOperand SH = Select(N->getOperand(2));
1197 SDOperand SH_HI_L = CurDAG->getTargetNode(PPC::SUBFIC, MVT::i32, MVT::Flag,
1199 SDOperand SH_HI_R = CurDAG->getTargetNode(PPC::ADDI, MVT::i32, SH,
1200 getI32Imm((unsigned)-32));
1201 SDOperand LO_SHR = CurDAG->getTargetNode(PPC::SRW, MVT::i32, LO, SH);
1202 SDOperand LO_HIL = CurDAG->getTargetNode(PPC::SLW, MVT::i32, HI, SH_HI_L);
1203 SDOperand LO_HIR = CurDAG->getTargetNode(PPC::SRW, MVT::i32, HI, SH_HI_R);
1204 SDOperand LO_OR = CurDAG->getTargetNode(PPC::OR, MVT::i32, LO_SHR, LO_HIL);
1206 std::vector<SDOperand> Result;
1207 Result.push_back(CurDAG->getTargetNode(PPC::OR, MVT::i32, LO_OR, LO_HIR));
1208 Result.push_back(CurDAG->getTargetNode(PPC::SRW, MVT::i32, HI, SH));
1209 CurDAG->ReplaceAllUsesWith(N, Result);
1210 return Result[Op.ResNo];
1216 case ISD::SEXTLOAD: {
1218 bool isIdx = SelectAddr(N->getOperand(1), Op1, Op2);
1220 MVT::ValueType TypeBeingLoaded = (N->getOpcode() == ISD::LOAD) ?
1221 N->getValueType(0) : cast<VTSDNode>(N->getOperand(3))->getVT();
1223 switch (TypeBeingLoaded) {
1224 default: N->dump(); assert(0 && "Cannot load this type!");
1226 case MVT::i8: Opc = isIdx ? PPC::LBZX : PPC::LBZ; break;
1228 if (N->getOpcode() == ISD::SEXTLOAD) { // SEXT load?
1229 Opc = isIdx ? PPC::LHAX : PPC::LHA;
1231 Opc = isIdx ? PPC::LHZX : PPC::LHZ;
1234 case MVT::i32: Opc = isIdx ? PPC::LWZX : PPC::LWZ; break;
1235 case MVT::f32: Opc = isIdx ? PPC::LFSX : PPC::LFS; break;
1236 case MVT::f64: Opc = isIdx ? PPC::LFDX : PPC::LFD; break;
1239 CurDAG->SelectNodeTo(N, Opc, N->getValueType(0), MVT::Other,
1240 Op1, Op2, Select(N->getOperand(0)));
1244 case ISD::TRUNCSTORE:
1246 SDOperand AddrOp1, AddrOp2;
1247 bool isIdx = SelectAddr(N->getOperand(2), AddrOp1, AddrOp2);
1250 if (N->getOpcode() == ISD::STORE) {
1251 switch (N->getOperand(1).getValueType()) {
1252 default: assert(0 && "unknown Type in store");
1253 case MVT::i32: Opc = isIdx ? PPC::STWX : PPC::STW; break;
1254 case MVT::f64: Opc = isIdx ? PPC::STFDX : PPC::STFD; break;
1255 case MVT::f32: Opc = isIdx ? PPC::STFSX : PPC::STFS; break;
1257 } else { //ISD::TRUNCSTORE
1258 switch(cast<VTSDNode>(N->getOperand(4))->getVT()) {
1259 default: assert(0 && "unknown Type in store");
1261 case MVT::i8: Opc = isIdx ? PPC::STBX : PPC::STB; break;
1262 case MVT::i16: Opc = isIdx ? PPC::STHX : PPC::STH; break;
1266 CurDAG->SelectNodeTo(N, Opc, MVT::Other, Select(N->getOperand(1)),
1267 AddrOp1, AddrOp2, Select(N->getOperand(0)));
1273 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
1274 if (isIntImmediate(N->getOperand(1), Imm)) {
1275 // We can codegen setcc op, imm very efficiently compared to a brcond.
1276 // Check for those cases here.
1279 SDOperand Op = Select(N->getOperand(0));
1281 default: assert(0 && "Unhandled SetCC condition"); abort();
1283 Op = CurDAG->getTargetNode(PPC::CNTLZW, MVT::i32, Op);
1284 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Op, getI32Imm(27),
1285 getI32Imm(5), getI32Imm(31));
1288 SDOperand AD = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag,
1289 Op, getI32Imm(~0U));
1290 CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op, AD.getValue(1));
1294 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Op, getI32Imm(1),
1295 getI32Imm(31), getI32Imm(31));
1298 SDOperand T = CurDAG->getTargetNode(PPC::NEG, MVT::i32, Op);
1299 T = CurDAG->getTargetNode(PPC::ANDC, MVT::i32, T, Op);;
1300 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, T, getI32Imm(1),
1301 getI32Imm(31), getI32Imm(31));
1306 } else if (Imm == ~0U) { // setcc op, -1
1307 SDOperand Op = Select(N->getOperand(0));
1309 default: assert(0 && "Unhandled SetCC condition"); abort();
1311 Op = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag,
1313 CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
1314 CurDAG->getTargetNode(PPC::LI, MVT::i32,
1319 Op = CurDAG->getTargetNode(PPC::NOR, MVT::i32, Op, Op);
1320 SDOperand AD = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, Op,
1322 CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op, AD.getValue(1));
1326 SDOperand AD = CurDAG->getTargetNode(PPC::ADDI, MVT::i32, Op,
1328 SDOperand AN = CurDAG->getTargetNode(PPC::AND, MVT::i32, AD, Op);
1329 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, AN, getI32Imm(1),
1330 getI32Imm(31), getI32Imm(31));
1334 Op = CurDAG->getTargetNode(PPC::RLWINM, MVT::i32, Op, getI32Imm(1),
1335 getI32Imm(31), getI32Imm(31));
1336 CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Op, getI32Imm(1));
1344 unsigned Idx = getCRIdxForSetCC(CC, Inv);
1346 SelectCC(Select(N->getOperand(0)), Select(N->getOperand(1)), CC);
1349 // Force the ccreg into CR7.
1350 SDOperand CR7Reg = CurDAG->getRegister(PPC::CR7, MVT::i32);
1352 std::vector<MVT::ValueType> VTs;
1353 VTs.push_back(MVT::Other);
1354 VTs.push_back(MVT::Flag); // NONSTANDARD CopyToReg node: defines a flag
1355 std::vector<SDOperand> Ops;
1356 Ops.push_back(CurDAG->getEntryNode());
1357 Ops.push_back(CR7Reg);
1358 Ops.push_back(CCReg);
1359 CCReg = CurDAG->getNode(ISD::CopyToReg, VTs, Ops).getValue(1);
1361 if (TLI.getTargetMachine().getSubtarget<PPCSubtarget>().isGigaProcessor())
1362 IntCR = CurDAG->getTargetNode(PPC::MFOCRF, MVT::i32, CR7Reg, CCReg);
1364 IntCR = CurDAG->getTargetNode(PPC::MFCR, MVT::i32, CCReg);
1367 CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, IntCR,
1368 getI32Imm(32-(3-Idx)), getI32Imm(31), getI32Imm(31));
1371 CurDAG->getTargetNode(PPC::RLWINM, MVT::i32, IntCR,
1372 getI32Imm(32-(3-Idx)), getI32Imm(31),getI32Imm(31));
1373 CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Tmp, getI32Imm(1));
1379 case ISD::CALLSEQ_START:
1380 case ISD::CALLSEQ_END: {
1381 unsigned Amt = cast<ConstantSDNode>(N->getOperand(1))->getValue();
1382 unsigned Opc = N->getOpcode() == ISD::CALLSEQ_START ?
1383 PPC::ADJCALLSTACKDOWN : PPC::ADJCALLSTACKUP;
1384 CurDAG->SelectNodeTo(N, Opc, MVT::Other,
1385 getI32Imm(Amt), Select(N->getOperand(0)));
1389 case ISD::TAILCALL: {
1390 SDOperand Chain = Select(N->getOperand(0));
1392 unsigned CallOpcode;
1393 std::vector<SDOperand> CallOperands;
1395 if (GlobalAddressSDNode *GASD =
1396 dyn_cast<GlobalAddressSDNode>(N->getOperand(1))) {
1397 CallOpcode = PPC::CALLpcrel;
1398 CallOperands.push_back(CurDAG->getTargetGlobalAddress(GASD->getGlobal(),
1400 } else if (ExternalSymbolSDNode *ESSDN =
1401 dyn_cast<ExternalSymbolSDNode>(N->getOperand(1))) {
1402 CallOpcode = PPC::CALLpcrel;
1403 CallOperands.push_back(N->getOperand(1));
1405 // Copy the callee address into the CTR register.
1406 SDOperand Callee = Select(N->getOperand(1));
1407 Chain = CurDAG->getTargetNode(PPC::MTCTR, MVT::Other, Callee, Chain);
1409 // Copy the callee address into R12 on darwin.
1410 SDOperand R12 = CurDAG->getRegister(PPC::R12, MVT::i32);
1411 Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, R12, Callee, Chain);
1413 CallOperands.push_back(getI32Imm(20)); // Information to encode indcall
1414 CallOperands.push_back(getI32Imm(0)); // Information to encode indcall
1415 CallOperands.push_back(R12);
1416 CallOpcode = PPC::CALLindirect;
1419 unsigned GPR_idx = 0, FPR_idx = 0;
1420 static const unsigned GPR[] = {
1421 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
1422 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
1424 static const unsigned FPR[] = {
1425 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
1426 PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
1429 for (unsigned i = 2, e = N->getNumOperands(); i != e; ++i)
1430 if (N->getOperand(i).getOpcode() != ISD::UNDEF) {
1431 unsigned DestReg = 0;
1432 MVT::ValueType RegTy;
1433 if (N->getOperand(i).getValueType() == MVT::i32) {
1434 assert(GPR_idx < 8 && "Too many int args");
1435 DestReg = GPR[GPR_idx++];
1438 assert(MVT::isFloatingPoint(N->getOperand(i).getValueType()) &&
1439 "Unpromoted integer arg?");
1440 assert(FPR_idx < 13 && "Too many fp args");
1441 DestReg = FPR[FPR_idx++];
1442 RegTy = MVT::f64; // Even if this is really f32!
1445 SDOperand Reg = CurDAG->getRegister(DestReg, RegTy);
1446 Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, Reg,
1447 Select(N->getOperand(i)));
1448 CallOperands.push_back(Reg);
1451 // Finally, once everything is in registers to pass to the call, emit the
1453 CallOperands.push_back(Chain);
1454 Chain = CurDAG->getTargetNode(CallOpcode, MVT::Other, CallOperands);
1456 std::vector<SDOperand> CallResults;
1458 // If the call has results, copy the values out of the ret val registers.
1459 switch (N->getValueType(0)) {
1460 default: assert(0 && "Unexpected ret value!");
1461 case MVT::Other: break;
1463 if (N->getValueType(1) == MVT::i32) {
1464 Chain = CurDAG->getCopyFromReg(Chain, PPC::R4, MVT::i32).getValue(1);
1465 CallResults.push_back(Chain.getValue(0));
1466 Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32).getValue(1);
1467 CallResults.push_back(Chain.getValue(0));
1469 Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32).getValue(1);
1470 CallResults.push_back(Chain.getValue(0));
1475 Chain = CurDAG->getCopyFromReg(Chain, PPC::F1, MVT::f64).getValue(1);
1476 CallResults.push_back(Chain.getValue(0));
1480 CallResults.push_back(Chain);
1481 CurDAG->ReplaceAllUsesWith(N, CallResults);
1482 return CallResults[Op.ResNo];
1485 SDOperand Chain = Select(N->getOperand(0)); // Token chain.
1487 if (N->getNumOperands() > 1) {
1488 SDOperand Val = Select(N->getOperand(1));
1489 switch (N->getOperand(1).getValueType()) {
1490 default: assert(0 && "Unknown return type!");
1493 Chain = CurDAG->getCopyToReg(Chain, PPC::F1, Val);
1496 Chain = CurDAG->getCopyToReg(Chain, PPC::R3, Val);
1500 if (N->getNumOperands() > 2) {
1501 assert(N->getOperand(1).getValueType() == MVT::i32 &&
1502 N->getOperand(2).getValueType() == MVT::i32 &&
1503 N->getNumOperands() == 3 && "Unknown two-register ret value!");
1504 Val = Select(N->getOperand(2));
1505 Chain = CurDAG->getCopyToReg(Chain, PPC::R4, Val);
1509 // Finally, select this to a blr (return) instruction.
1510 CurDAG->SelectNodeTo(N, PPC::BLR, MVT::Other, Chain);
1514 CurDAG->SelectNodeTo(N, PPC::B, MVT::Other, N->getOperand(1),
1515 Select(N->getOperand(0)));
1518 case ISD::BRTWOWAY_CC: {
1519 SDOperand Chain = Select(N->getOperand(0));
1520 MachineBasicBlock *Dest =
1521 cast<BasicBlockSDNode>(N->getOperand(4))->getBasicBlock();
1522 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
1523 SDOperand CondCode = SelectCC(N->getOperand(2), N->getOperand(3), CC);
1524 unsigned Opc = getBCCForSetCC(CC);
1526 // If this is a two way branch, then grab the fallthrough basic block
1527 // argument and build a PowerPC branch pseudo-op, suitable for long branch
1528 // conversion if necessary by the branch selection pass. Otherwise, emit a
1529 // standard conditional branch.
1530 if (N->getOpcode() == ISD::BRTWOWAY_CC) {
1531 MachineBasicBlock *Fallthrough =
1532 cast<BasicBlockSDNode>(N->getOperand(5))->getBasicBlock();
1533 SDOperand CB = CurDAG->getTargetNode(PPC::COND_BRANCH, MVT::Other,
1534 CondCode, getI32Imm(Opc),
1535 N->getOperand(4), N->getOperand(5),
1537 CurDAG->SelectNodeTo(N, PPC::B, MVT::Other, N->getOperand(5), CB);
1539 // Iterate to the next basic block
1540 ilist<MachineBasicBlock>::iterator It = BB;
1543 // If the fallthrough path is off the end of the function, which would be
1544 // undefined behavior, set it to be the same as the current block because
1545 // we have nothing better to set it to, and leaving it alone will cause
1546 // the PowerPC Branch Selection pass to crash.
1547 if (It == BB->getParent()->end()) It = Dest;
1548 CurDAG->SelectNodeTo(N, PPC::COND_BRANCH, MVT::Other, CondCode,
1549 getI32Imm(Opc), N->getOperand(4),
1550 CurDAG->getBasicBlock(It), Chain);
1555 return SDOperand(N, Op.ResNo);
1559 /// createPPC32ISelDag - This pass converts a legalized DAG into a
1560 /// PowerPC-specific DAG, ready for instruction scheduling.
1562 FunctionPass *llvm::createPPC32ISelDag(TargetMachine &TM) {
1563 return new PPC32DAGToDAGISel(TM);