1 //===-- PPC32ISelPattern.cpp - A pattern matching inst selector for PPC32 -===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Nate Begeman 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 // Magic number generation for integer divide from the PowerPC Compiler Writer's
12 // Guide, section 3.2.3.5
14 //===----------------------------------------------------------------------===//
17 #include "PowerPCInstrBuilder.h"
18 #include "PowerPCInstrInfo.h"
19 #include "PPC32TargetMachine.h"
20 #include "PPC32ISelLowering.h"
21 #include "llvm/Constants.h"
22 #include "llvm/Function.h"
23 #include "llvm/CodeGen/MachineConstantPool.h"
24 #include "llvm/CodeGen/MachineFunction.h"
25 #include "llvm/CodeGen/MachineFrameInfo.h"
26 #include "llvm/CodeGen/SelectionDAG.h"
27 #include "llvm/CodeGen/SelectionDAGISel.h"
28 #include "llvm/CodeGen/SSARegMap.h"
29 #include "llvm/Target/TargetData.h"
30 #include "llvm/Target/TargetOptions.h"
31 #include "llvm/Support/Debug.h"
32 #include "llvm/Support/MathExtras.h"
33 #include "llvm/ADT/Statistic.h"
39 Statistic<> Recorded("ppc-codegen", "Number of recording ops emitted");
40 Statistic<> FusedFP ("ppc-codegen", "Number of fused fp operations");
41 Statistic<> FrameOff("ppc-codegen", "Number of frame idx offsets collapsed");
43 //===--------------------------------------------------------------------===//
44 // ISel - PPC32 specific code to select PPC32 machine instructions for
45 // SelectionDAG operations.
46 //===--------------------------------------------------------------------===//
48 class ISel : public SelectionDAGISel {
49 PPC32TargetLowering PPC32Lowering;
50 SelectionDAG *ISelDAG; // Hack to support us having a dag->dag transform
51 // for sdiv and udiv until it is put into the future
54 /// ExprMap - As shared expressions are codegen'd, we keep track of which
55 /// vreg the value is produced in, so we only emit one copy of each compiled
57 std::map<SDOperand, unsigned> ExprMap;
59 unsigned GlobalBaseReg;
60 bool GlobalBaseInitialized;
63 ISel(TargetMachine &TM) : SelectionDAGISel(PPC32Lowering), PPC32Lowering(TM),
66 /// runOnFunction - Override this function in order to reset our per-function
68 virtual bool runOnFunction(Function &Fn) {
69 // Make sure we re-emit a set of the global base reg if necessary
70 GlobalBaseInitialized = false;
71 return SelectionDAGISel::runOnFunction(Fn);
74 /// InstructionSelectBasicBlock - This callback is invoked by
75 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
76 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG) {
78 // Codegen the basic block.
80 Select(DAG.getRoot());
82 // Clear state used for selection.
87 // convenience functions for virtual register creation
88 inline unsigned MakeIntReg() {
89 return RegMap->createVirtualRegister(PPC32::GPRCRegisterClass);
91 inline unsigned MakeFPReg() {
92 return RegMap->createVirtualRegister(PPC32::FPRCRegisterClass);
95 // dag -> dag expanders for integer divide by constant
96 SDOperand BuildSDIVSequence(SDOperand N);
97 SDOperand BuildUDIVSequence(SDOperand N);
99 unsigned getGlobalBaseReg();
100 unsigned getConstDouble(double floatVal, unsigned Result);
101 void MoveCRtoGPR(unsigned CCReg, ISD::CondCode CC, unsigned Result);
102 bool SelectBitfieldInsert(SDOperand OR, unsigned Result);
103 unsigned FoldIfWideZeroExtend(SDOperand N);
104 unsigned SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC);
105 bool SelectIntImmediateExpr(SDOperand N, unsigned Result,
106 unsigned OCHi, unsigned OCLo,
107 bool IsArithmetic = false, bool Negate = false);
108 unsigned SelectExpr(SDOperand N, bool Recording=false);
109 void Select(SDOperand N);
111 unsigned SelectAddr(SDOperand N, unsigned& Reg, int& offset);
112 void SelectBranchCC(SDOperand N);
114 virtual const char *getPassName() const {
115 return "PowerPC Pattern Instruction Selection";
119 // isRunOfOnes - Returns true iff Val consists of one contiguous run of 1s with
120 // any number of 0s on either side. The 1s are allowed to wrap from LSB to
121 // MSB, so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs. 0x0F0F0000 is
122 // not, since all 1s are not contiguous.
123 static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
124 if (isShiftedMask_32(Val)) {
125 // look for the first non-zero bit
126 MB = CountLeadingZeros_32(Val);
127 // look for the first zero bit after the run of ones
128 ME = CountLeadingZeros_32((Val - 1) ^ Val);
130 } else if (isShiftedMask_32(Val = ~Val)) { // invert mask
131 // effectively look for the first zero bit
132 ME = CountLeadingZeros_32(Val) - 1;
133 // effectively look for the first one bit after the run of zeros
134 MB = CountLeadingZeros_32((Val - 1) ^ Val) + 1;
141 // isRotateAndMask - Returns true if Mask and Shift can be folded in to a rotate
142 // and mask opcode and mask operation.
143 static bool isRotateAndMask(unsigned Opcode, unsigned Shift, unsigned Mask,
145 unsigned &SH, unsigned &MB, unsigned &ME) {
146 if (Shift > 31) return false;
147 unsigned Indeterminant = ~0; // bit mask marking indeterminant results
149 if (Opcode == ISD::SHL) { // shift left
150 // apply shift to mask if it comes first
151 if (IsShiftMask) Mask = Mask << Shift;
152 // determine which bits are made indeterminant by shift
153 Indeterminant = ~(0xFFFFFFFFu << Shift);
154 } else if (Opcode == ISD::SRA || Opcode == ISD::SRL) { // shift rights
155 // apply shift to mask if it comes first
156 if (IsShiftMask) Mask = Mask >> Shift;
157 // determine which bits are made indeterminant by shift
158 Indeterminant = ~(0xFFFFFFFFu >> Shift);
159 // adjust for the left rotate
163 // if the mask doesn't intersect any Indeterminant bits
164 if (Mask && !(Mask & Indeterminant)) {
166 // make sure the mask is still a mask (wrap arounds may not be)
167 return isRunOfOnes(Mask, MB, ME);
174 // isIntImmediate - This method tests to see if a constant operand.
175 // If so Imm will receive the 32 bit value.
176 static bool isIntImmediate(SDOperand N, unsigned& Imm) {
178 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
180 Imm = (unsigned)CN->getValue();
188 // isOpcWithIntImmediate - This method tests to see if the node is a specific
189 // opcode and that it has a immediate integer right operand.
190 // If so Imm will receive the 32 bit value.
191 static bool isOpcWithIntImmediate(SDOperand N, unsigned Opc, unsigned& Imm) {
192 return N.getOpcode() == Opc && isIntImmediate(N.getOperand(1), Imm);
195 // isOprShiftImm - Returns true if the specified operand is a shift opcode with
196 // a immediate shift count less than 32.
197 static bool isOprShiftImm(SDOperand N, unsigned& Opc, unsigned& SH) {
199 return (Opc == ISD::SHL || Opc == ISD::SRL || Opc == ISD::SRA) &&
200 isIntImmediate(N.getOperand(1), SH) && SH < 32;
203 // isOprNot - Returns true if the specified operand is an xor with immediate -1.
204 static bool isOprNot(SDOperand N) {
206 return isOpcWithIntImmediate(N, ISD::XOR, Imm) && (signed)Imm == -1;
209 // Immediate constant composers.
210 // Lo16 - grabs the lo 16 bits from a 32 bit constant.
211 // Hi16 - grabs the hi 16 bits from a 32 bit constant.
212 // HA16 - computes the hi bits required if the lo bits are add/subtracted in
214 static unsigned Lo16(unsigned x) { return x & 0x0000FFFF; }
215 static unsigned Hi16(unsigned x) { return Lo16(x >> 16); }
216 static unsigned HA16(unsigned x) { return Hi16((signed)x - (signed short)x); }
218 /// NodeHasRecordingVariant - If SelectExpr can always produce code for
219 /// NodeOpcode that also sets CR0 as a side effect, return true. Otherwise,
221 static bool NodeHasRecordingVariant(unsigned NodeOpcode) {
223 default: return false;
230 /// getBCCForSetCC - Returns the PowerPC condition branch mnemonic corresponding
232 static unsigned getBCCForSetCC(ISD::CondCode CC) {
234 default: assert(0 && "Unknown condition!"); abort();
235 case ISD::SETEQ: return PPC::BEQ;
236 case ISD::SETNE: return PPC::BNE;
238 case ISD::SETLT: return PPC::BLT;
240 case ISD::SETLE: return PPC::BLE;
242 case ISD::SETGT: return PPC::BGT;
244 case ISD::SETGE: return PPC::BGE;
249 /// getCRIdxForSetCC - Return the index of the condition register field
250 /// associated with the SetCC condition, and whether or not the field is
251 /// treated as inverted. That is, lt = 0; ge = 0 inverted.
252 static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool& Inv) {
254 default: assert(0 && "Unknown condition!"); abort();
256 case ISD::SETLT: Inv = false; return 0;
258 case ISD::SETGE: Inv = true; return 0;
260 case ISD::SETGT: Inv = false; return 1;
262 case ISD::SETLE: Inv = true; return 1;
263 case ISD::SETEQ: Inv = false; return 2;
264 case ISD::SETNE: Inv = true; return 2;
269 /// IndexedOpForOp - Return the indexed variant for each of the PowerPC load
270 /// and store immediate instructions.
271 static unsigned IndexedOpForOp(unsigned Opcode) {
273 default: assert(0 && "Unknown opcode!"); abort();
274 case PPC::LBZ: return PPC::LBZX; case PPC::STB: return PPC::STBX;
275 case PPC::LHZ: return PPC::LHZX; case PPC::STH: return PPC::STHX;
276 case PPC::LHA: return PPC::LHAX; case PPC::STW: return PPC::STWX;
277 case PPC::LWZ: return PPC::LWZX; case PPC::STFS: return PPC::STFSX;
278 case PPC::LFS: return PPC::LFSX; case PPC::STFD: return PPC::STFDX;
279 case PPC::LFD: return PPC::LFDX;
284 // Structure used to return the necessary information to codegen an SDIV as
287 int m; // magic number
288 int s; // shift amount
292 unsigned int m; // magic number
293 int a; // add indicator
294 int s; // shift amount
297 /// magic - calculate the magic numbers required to codegen an integer sdiv as
298 /// a sequence of multiply and shifts. Requires that the divisor not be 0, 1,
300 static struct ms magic(int d) {
302 unsigned int ad, anc, delta, q1, r1, q2, r2, t;
303 const unsigned int two31 = 0x80000000U;
307 t = two31 + ((unsigned int)d >> 31);
308 anc = t - 1 - t%ad; // absolute value of nc
309 p = 31; // initialize p
310 q1 = two31/anc; // initialize q1 = 2p/abs(nc)
311 r1 = two31 - q1*anc; // initialize r1 = rem(2p,abs(nc))
312 q2 = two31/ad; // initialize q2 = 2p/abs(d)
313 r2 = two31 - q2*ad; // initialize r2 = rem(2p,abs(d))
316 q1 = 2*q1; // update q1 = 2p/abs(nc)
317 r1 = 2*r1; // update r1 = rem(2p/abs(nc))
318 if (r1 >= anc) { // must be unsigned comparison
322 q2 = 2*q2; // update q2 = 2p/abs(d)
323 r2 = 2*r2; // update r2 = rem(2p/abs(d))
324 if (r2 >= ad) { // must be unsigned comparison
329 } while (q1 < delta || (q1 == delta && r1 == 0));
332 if (d < 0) mag.m = -mag.m; // resulting magic number
333 mag.s = p - 32; // resulting shift
337 /// magicu - calculate the magic numbers required to codegen an integer udiv as
338 /// a sequence of multiply, add and shifts. Requires that the divisor not be 0.
339 static struct mu magicu(unsigned d)
342 unsigned int nc, delta, q1, r1, q2, r2;
344 magu.a = 0; // initialize "add" indicator
346 p = 31; // initialize p
347 q1 = 0x80000000/nc; // initialize q1 = 2p/nc
348 r1 = 0x80000000 - q1*nc; // initialize r1 = rem(2p,nc)
349 q2 = 0x7FFFFFFF/d; // initialize q2 = (2p-1)/d
350 r2 = 0x7FFFFFFF - q2*d; // initialize r2 = rem((2p-1),d)
353 if (r1 >= nc - r1 ) {
354 q1 = 2*q1 + 1; // update q1
355 r1 = 2*r1 - nc; // update r1
358 q1 = 2*q1; // update q1
359 r1 = 2*r1; // update r1
361 if (r2 + 1 >= d - r2) {
362 if (q2 >= 0x7FFFFFFF) magu.a = 1;
363 q2 = 2*q2 + 1; // update q2
364 r2 = 2*r2 + 1 - d; // update r2
367 if (q2 >= 0x80000000) magu.a = 1;
368 q2 = 2*q2; // update q2
369 r2 = 2*r2 + 1; // update r2
372 } while (p < 64 && (q1 < delta || (q1 == delta && r1 == 0)));
373 magu.m = q2 + 1; // resulting magic number
374 magu.s = p - 32; // resulting shift
379 /// BuildSDIVSequence - Given an ISD::SDIV node expressing a divide by constant,
380 /// return a DAG expression to select that will generate the same value by
381 /// multiplying by a magic number. See:
382 /// <http://the.wall.riscom.net/books/proc/ppc/cwg/code2.html>
383 SDOperand ISel::BuildSDIVSequence(SDOperand N) {
384 int d = (int)cast<ConstantSDNode>(N.getOperand(1))->getSignExtended();
385 ms magics = magic(d);
386 // Multiply the numerator (operand 0) by the magic value
387 SDOperand Q = ISelDAG->getNode(ISD::MULHS, MVT::i32, N.getOperand(0),
388 ISelDAG->getConstant(magics.m, MVT::i32));
389 // If d > 0 and m < 0, add the numerator
390 if (d > 0 && magics.m < 0)
391 Q = ISelDAG->getNode(ISD::ADD, MVT::i32, Q, N.getOperand(0));
392 // If d < 0 and m > 0, subtract the numerator.
393 if (d < 0 && magics.m > 0)
394 Q = ISelDAG->getNode(ISD::SUB, MVT::i32, Q, N.getOperand(0));
395 // Shift right algebraic if shift value is nonzero
397 Q = ISelDAG->getNode(ISD::SRA, MVT::i32, Q,
398 ISelDAG->getConstant(magics.s, MVT::i32));
399 // Extract the sign bit and add it to the quotient
401 ISelDAG->getNode(ISD::SRL, MVT::i32, Q, ISelDAG->getConstant(31, MVT::i32));
402 return ISelDAG->getNode(ISD::ADD, MVT::i32, Q, T);
405 /// BuildUDIVSequence - Given an ISD::UDIV node expressing a divide by constant,
406 /// return a DAG expression to select that will generate the same value by
407 /// multiplying by a magic number. See:
408 /// <http://the.wall.riscom.net/books/proc/ppc/cwg/code2.html>
409 SDOperand ISel::BuildUDIVSequence(SDOperand N) {
411 (unsigned)cast<ConstantSDNode>(N.getOperand(1))->getSignExtended();
412 mu magics = magicu(d);
413 // Multiply the numerator (operand 0) by the magic value
414 SDOperand Q = ISelDAG->getNode(ISD::MULHU, MVT::i32, N.getOperand(0),
415 ISelDAG->getConstant(magics.m, MVT::i32));
417 Q = ISelDAG->getNode(ISD::SRL, MVT::i32, Q,
418 ISelDAG->getConstant(magics.s, MVT::i32));
420 SDOperand NPQ = ISelDAG->getNode(ISD::SUB, MVT::i32, N.getOperand(0), Q);
421 NPQ = ISelDAG->getNode(ISD::SRL, MVT::i32, NPQ,
422 ISelDAG->getConstant(1, MVT::i32));
423 NPQ = ISelDAG->getNode(ISD::ADD, MVT::i32, NPQ, Q);
424 Q = ISelDAG->getNode(ISD::SRL, MVT::i32, NPQ,
425 ISelDAG->getConstant(magics.s-1, MVT::i32));
430 /// getGlobalBaseReg - Output the instructions required to put the
431 /// base address to use for accessing globals into a register.
433 unsigned ISel::getGlobalBaseReg() {
434 if (!GlobalBaseInitialized) {
435 // Insert the set of GlobalBaseReg into the first MBB of the function
436 MachineBasicBlock &FirstMBB = BB->getParent()->front();
437 MachineBasicBlock::iterator MBBI = FirstMBB.begin();
438 GlobalBaseReg = MakeIntReg();
439 BuildMI(FirstMBB, MBBI, PPC::MovePCtoLR, 0, PPC::LR);
440 BuildMI(FirstMBB, MBBI, PPC::MFLR, 1, GlobalBaseReg);
441 GlobalBaseInitialized = true;
443 return GlobalBaseReg;
446 /// getConstDouble - Loads a floating point value into a register, via the
447 /// Constant Pool. Optionally takes a register in which to load the value.
448 unsigned ISel::getConstDouble(double doubleVal, unsigned Result=0) {
449 unsigned Tmp1 = MakeIntReg();
450 if (0 == Result) Result = MakeFPReg();
451 MachineConstantPool *CP = BB->getParent()->getConstantPool();
452 ConstantFP *CFP = ConstantFP::get(Type::DoubleTy, doubleVal);
453 unsigned CPI = CP->getConstantPoolIndex(CFP);
455 BuildMI(BB, PPC::ADDIS, 2, Tmp1).addReg(getGlobalBaseReg())
456 .addConstantPoolIndex(CPI);
458 BuildMI(BB, PPC::LIS, 1, Tmp1).addConstantPoolIndex(CPI);
459 BuildMI(BB, PPC::LFD, 2, Result).addConstantPoolIndex(CPI).addReg(Tmp1);
463 /// MoveCRtoGPR - Move CCReg[Idx] to the least significant bit of Result. If
464 /// Inv is true, then invert the result.
465 void ISel::MoveCRtoGPR(unsigned CCReg, ISD::CondCode CC, unsigned Result){
467 unsigned IntCR = MakeIntReg();
468 unsigned Idx = getCRIdxForSetCC(CC, Inv);
469 BuildMI(BB, PPC::MCRF, 1, PPC::CR7).addReg(CCReg);
471 TLI.getTargetMachine().getSubtarget<PPCSubtarget>().isGigaProcessor();
473 BuildMI(BB, PPC::MFOCRF, 1, IntCR).addReg(PPC::CR7);
475 BuildMI(BB, PPC::MFCR, 0, IntCR);
477 unsigned Tmp1 = MakeIntReg();
478 BuildMI(BB, PPC::RLWINM, 4, Tmp1).addReg(IntCR).addImm(32-(3-Idx))
479 .addImm(31).addImm(31);
480 BuildMI(BB, PPC::XORI, 2, Result).addReg(Tmp1).addImm(1);
482 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(IntCR).addImm(32-(3-Idx))
483 .addImm(31).addImm(31);
487 /// SelectBitfieldInsert - turn an or of two masked values into
488 /// the rotate left word immediate then mask insert (rlwimi) instruction.
489 /// Returns true on success, false if the caller still needs to select OR.
491 /// Patterns matched:
492 /// 1. or shl, and 5. or and, and
493 /// 2. or and, shl 6. or shl, shr
494 /// 3. or shr, and 7. or shr, shl
496 bool ISel::SelectBitfieldInsert(SDOperand OR, unsigned Result) {
497 bool IsRotate = false;
498 unsigned TgtMask = 0xFFFFFFFF, InsMask = 0xFFFFFFFF, Amount = 0;
501 SDOperand Op0 = OR.getOperand(0);
502 SDOperand Op1 = OR.getOperand(1);
504 unsigned Op0Opc = Op0.getOpcode();
505 unsigned Op1Opc = Op1.getOpcode();
507 // Verify that we have the correct opcodes
508 if (ISD::SHL != Op0Opc && ISD::SRL != Op0Opc && ISD::AND != Op0Opc)
510 if (ISD::SHL != Op1Opc && ISD::SRL != Op1Opc && ISD::AND != Op1Opc)
513 // Generate Mask value for Target
514 if (isIntImmediate(Op0.getOperand(1), Value)) {
516 case ISD::SHL: TgtMask <<= Value; break;
517 case ISD::SRL: TgtMask >>= Value; break;
518 case ISD::AND: TgtMask &= Value; break;
524 // Generate Mask value for Insert
525 if (isIntImmediate(Op1.getOperand(1), Value)) {
530 if (Op0Opc == ISD::SRL) IsRotate = true;
536 if (Op0Opc == ISD::SHL) IsRotate = true;
548 // If both of the inputs are ANDs and one of them has a logical shift by
549 // constant as its input, make that the inserted value so that we can combine
550 // the shift into the rotate part of the rlwimi instruction
551 if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) {
552 if (Op1.getOperand(0).getOpcode() == ISD::SHL ||
553 Op1.getOperand(0).getOpcode() == ISD::SRL) {
554 if (isIntImmediate(Op1.getOperand(0).getOperand(1), Value)) {
555 Amount = Op1.getOperand(0).getOpcode() == ISD::SHL ?
557 Tmp3 = SelectExpr(Op1.getOperand(0).getOperand(0));
559 } else if (Op0.getOperand(0).getOpcode() == ISD::SHL ||
560 Op0.getOperand(0).getOpcode() == ISD::SRL) {
561 if (isIntImmediate(Op0.getOperand(0).getOperand(1), Value)) {
563 std::swap(TgtMask, InsMask);
564 Amount = Op1.getOperand(0).getOpcode() == ISD::SHL ?
566 Tmp3 = SelectExpr(Op1.getOperand(0).getOperand(0));
571 // Verify that the Target mask and Insert mask together form a full word mask
572 // and that the Insert mask is a run of set bits (which implies both are runs
573 // of set bits). Given that, Select the arguments and generate the rlwimi
576 if (((TgtMask & InsMask) == 0) && isRunOfOnes(InsMask, MB, ME)) {
578 bool fullMask = (TgtMask ^ InsMask) == 0xFFFFFFFF;
579 // Check for rotlwi / rotrwi here, a special case of bitfield insert
580 // where both bitfield halves are sourced from the same value.
581 if (IsRotate && fullMask &&
582 OR.getOperand(0).getOperand(0) == OR.getOperand(1).getOperand(0)) {
583 Tmp1 = SelectExpr(OR.getOperand(0).getOperand(0));
584 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(Amount)
585 .addImm(0).addImm(31);
588 if (Op0Opc == ISD::AND && fullMask)
589 Tmp1 = SelectExpr(Op0.getOperand(0));
591 Tmp1 = SelectExpr(Op0);
592 Tmp2 = Tmp3 ? Tmp3 : SelectExpr(Op1.getOperand(0));
593 BuildMI(BB, PPC::RLWIMI, 5, Result).addReg(Tmp1).addReg(Tmp2)
594 .addImm(Amount).addImm(MB).addImm(ME);
600 /// FoldIfWideZeroExtend - 32 bit PowerPC implicit masks shift amounts to the
601 /// low six bits. If the shift amount is an ISD::AND node with a mask that is
602 /// wider than the implicit mask, then we can get rid of the AND and let the
603 /// shift do the mask.
604 unsigned ISel::FoldIfWideZeroExtend(SDOperand N) {
606 if (isOpcWithIntImmediate(N, ISD::AND, C) && isMask_32(C) && C > 63)
607 return SelectExpr(N.getOperand(0));
609 return SelectExpr(N);
612 unsigned ISel::SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC) {
613 unsigned Result, Tmp1, Tmp2;
614 bool AlreadySelected = false;
615 static const unsigned CompareOpcodes[] =
616 { PPC::FCMPU, PPC::FCMPU, PPC::CMPW, PPC::CMPLW };
618 // Allocate a condition register for this expression
619 Result = RegMap->createVirtualRegister(PPC32::CRRCRegisterClass);
621 // Use U to determine whether the SETCC immediate range is signed or not.
622 bool U = ISD::isUnsignedIntSetCC(CC);
623 if (isIntImmediate(RHS, Tmp2) &&
624 ((U && isUInt16(Tmp2)) || (!U && isInt16(Tmp2)))) {
626 // For comparisons against zero, we can implicity set CR0 if a recording
627 // variant (e.g. 'or.' instead of 'or') of the instruction that defines
628 // operand zero of the SetCC node is available.
630 NodeHasRecordingVariant(LHS.getOpcode()) && LHS.Val->hasOneUse()) {
631 RecordSuccess = false;
632 Tmp1 = SelectExpr(LHS, true);
635 BuildMI(BB, PPC::MCRF, 1, Result).addReg(PPC::CR0);
638 AlreadySelected = true;
640 // If we could not implicitly set CR0, then emit a compare immediate
642 if (!AlreadySelected) Tmp1 = SelectExpr(LHS);
644 BuildMI(BB, PPC::CMPLWI, 2, Result).addReg(Tmp1).addImm(Tmp2);
646 BuildMI(BB, PPC::CMPWI, 2, Result).addReg(Tmp1).addSImm(Tmp2);
648 bool IsInteger = MVT::isInteger(LHS.getValueType());
649 unsigned CompareOpc = CompareOpcodes[2 * IsInteger + U];
650 Tmp1 = SelectExpr(LHS);
651 Tmp2 = SelectExpr(RHS);
652 BuildMI(BB, CompareOpc, 2, Result).addReg(Tmp1).addReg(Tmp2);
657 /// Check to see if the load is a constant offset from a base register.
658 unsigned ISel::SelectAddr(SDOperand N, unsigned& Reg, int& offset)
660 unsigned imm = 0, opcode = N.getOpcode();
661 if (N.getOpcode() == ISD::ADD) {
662 bool isFrame = N.getOperand(0).getOpcode() == ISD::FrameIndex;
663 if (isIntImmediate(N.getOperand(1), imm) && isInt16(imm)) {
667 Reg = cast<FrameIndexSDNode>(N.getOperand(0))->getIndex();
670 Reg = SelectExpr(N.getOperand(0));
674 Reg = SelectExpr(N.getOperand(0));
675 offset = SelectExpr(N.getOperand(1));
679 // Now check if we're dealing with a global, and whether or not we should emit
680 // an optimized load or store for statics.
681 if(GlobalAddressSDNode *GN = dyn_cast<GlobalAddressSDNode>(N)) {
682 GlobalValue *GV = GN->getGlobal();
683 if (!GV->hasWeakLinkage() && !GV->isExternal()) {
684 unsigned GlobalHi = MakeIntReg();
686 BuildMI(BB, PPC::ADDIS, 2, GlobalHi).addReg(getGlobalBaseReg())
687 .addGlobalAddress(GV);
689 BuildMI(BB, PPC::LIS, 1, GlobalHi).addGlobalAddress(GV);
700 void ISel::SelectBranchCC(SDOperand N)
702 MachineBasicBlock *Dest =
703 cast<BasicBlockSDNode>(N.getOperand(4))->getBasicBlock();
705 Select(N.getOperand(0)); //chain
706 ISD::CondCode CC = cast<CondCodeSDNode>(N.getOperand(1))->get();
707 unsigned CCReg = SelectCC(N.getOperand(2), N.getOperand(3), CC);
708 unsigned Opc = getBCCForSetCC(CC);
710 // If this is a two way branch, then grab the fallthrough basic block argument
711 // and build a PowerPC branch pseudo-op, suitable for long branch conversion
712 // if necessary by the branch selection pass. Otherwise, emit a standard
713 // conditional branch.
714 if (N.getOpcode() == ISD::BRTWOWAY_CC) {
715 MachineBasicBlock *Fallthrough =
716 cast<BasicBlockSDNode>(N.getOperand(5))->getBasicBlock();
717 BuildMI(BB, PPC::COND_BRANCH, 4).addReg(CCReg).addImm(Opc)
718 .addMBB(Dest).addMBB(Fallthrough);
719 BuildMI(BB, PPC::B, 1).addMBB(Fallthrough);
721 // Iterate to the next basic block
722 ilist<MachineBasicBlock>::iterator It = BB;
725 // If the fallthrough path is off the end of the function, which would be
726 // undefined behavior, set it to be the same as the current block because
727 // we have nothing better to set it to, and leaving it alone will cause the
728 // PowerPC Branch Selection pass to crash.
729 if (It == BB->getParent()->end()) It = Dest;
730 BuildMI(BB, PPC::COND_BRANCH, 4).addReg(CCReg).addImm(Opc)
731 .addMBB(Dest).addMBB(It);
736 // SelectIntImmediateExpr - Choose code for opcodes with immediate value.
737 bool ISel::SelectIntImmediateExpr(SDOperand N, unsigned Result,
738 unsigned OCHi, unsigned OCLo,
739 bool IsArithmetic, bool Negate) {
741 ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1));
742 // exit if not a constant
743 if (!CN) return false;
745 unsigned C = (unsigned)CN->getValue();
746 // negate if required (ISD::SUB)
748 // get the hi and lo portions of constant
749 unsigned Hi = IsArithmetic ? HA16(C) : Hi16(C);
750 unsigned Lo = Lo16(C);
751 // assume no intermediate result from lo instruction (same as final result)
752 unsigned Tmp = Result;
753 // check if two instructions are needed
755 // exit if usage indicates it would be better to load immediate into a
757 if (CN->use_size() > 2) return false;
758 // need intermediate result for two instructions
762 unsigned Opr0 = SelectExpr(N.getOperand(0));
763 // is a lo instruction needed
765 // generate instruction for lo portion
766 BuildMI(BB, OCLo, 2, Tmp).addReg(Opr0).addImm(Lo);
767 // need to switch out first operand for hi instruction
770 // is a hi instruction needed
772 // generate instruction for hi portion
773 BuildMI(BB, OCHi, 2, Result).addReg(Opr0).addImm(Hi);
778 unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
780 unsigned Tmp1, Tmp2, Tmp3;
782 unsigned opcode = N.getOpcode();
784 SDNode *Node = N.Val;
785 MVT::ValueType DestType = N.getValueType();
787 if (Node->getOpcode() == ISD::CopyFromReg) {
788 unsigned Reg = cast<RegisterSDNode>(Node->getOperand(1))->getReg();
789 // Just use the specified register as our input.
790 if (MRegisterInfo::isVirtualRegister(Reg) || Reg == PPC::R1)
794 unsigned &Reg = ExprMap[N];
797 switch (N.getOpcode()) {
799 Reg = Result = (N.getValueType() != MVT::Other) ?
800 MakeReg(N.getValueType()) : 1;
804 // If this is a call instruction, make sure to prepare ALL of the result
805 // values as well as the chain.
806 if (Node->getNumValues() == 1)
807 Reg = Result = 1; // Void call, just a chain.
809 Result = MakeReg(Node->getValueType(0));
810 ExprMap[N.getValue(0)] = Result;
811 for (unsigned i = 1, e = N.Val->getNumValues()-1; i != e; ++i)
812 ExprMap[N.getValue(i)] = MakeReg(Node->getValueType(i));
813 ExprMap[SDOperand(Node, Node->getNumValues()-1)] = 1;
821 Result = MakeReg(Node->getValueType(0));
822 ExprMap[N.getValue(0)] = Result;
823 for (unsigned i = 1, e = N.Val->getNumValues(); i != e; ++i)
824 ExprMap[N.getValue(i)] = MakeReg(Node->getValueType(i));
830 Node->dump(); std::cerr << '\n';
831 assert(0 && "Node not handled!\n");
833 if (Node->getValueType(0) == MVT::i32)
834 BuildMI(BB, PPC::IMPLICIT_DEF_GPR, 0, Result);
836 BuildMI(BB, PPC::IMPLICIT_DEF_FP, 0, Result);
838 case ISD::DYNAMIC_STACKALLOC:
839 // Generate both result values. FIXME: Need a better commment here?
841 ExprMap[N.getValue(1)] = 1;
843 Result = ExprMap[N.getValue(0)] = MakeReg(N.getValue(0).getValueType());
845 // FIXME: We are currently ignoring the requested alignment for handling
846 // greater than the stack alignment. This will need to be revisited at some
847 // point. Align = N.getOperand(2);
848 if (!isa<ConstantSDNode>(N.getOperand(2)) ||
849 cast<ConstantSDNode>(N.getOperand(2))->getValue() != 0) {
850 std::cerr << "Cannot allocate stack object with greater alignment than"
851 << " the stack alignment yet!";
854 Select(N.getOperand(0));
855 Tmp1 = SelectExpr(N.getOperand(1));
856 // Subtract size from stack pointer, thereby allocating some space.
857 BuildMI(BB, PPC::SUBF, 2, PPC::R1).addReg(Tmp1).addReg(PPC::R1);
858 // Put a pointer to the space into the result register by copying the SP
859 BuildMI(BB, PPC::OR, 2, Result).addReg(PPC::R1).addReg(PPC::R1);
862 case ISD::ConstantPool:
863 Tmp1 = cast<ConstantPoolSDNode>(N)->getIndex();
866 BuildMI(BB, PPC::ADDIS, 2, Tmp2).addReg(getGlobalBaseReg())
867 .addConstantPoolIndex(Tmp1);
869 BuildMI(BB, PPC::LIS, 1, Tmp2).addConstantPoolIndex(Tmp1);
870 BuildMI(BB, PPC::LA, 2, Result).addReg(Tmp2).addConstantPoolIndex(Tmp1);
873 case ISD::FrameIndex:
874 Tmp1 = cast<FrameIndexSDNode>(N)->getIndex();
875 addFrameReference(BuildMI(BB, PPC::ADDI, 2, Result), (int)Tmp1, 0, false);
878 case ISD::GlobalAddress: {
879 GlobalValue *GV = cast<GlobalAddressSDNode>(N)->getGlobal();
882 BuildMI(BB, PPC::ADDIS, 2, Tmp1).addReg(getGlobalBaseReg())
883 .addGlobalAddress(GV);
885 BuildMI(BB, PPC::LIS, 1, Tmp1).addGlobalAddress(GV);
886 if (GV->hasWeakLinkage() || GV->isExternal()) {
887 BuildMI(BB, PPC::LWZ, 2, Result).addGlobalAddress(GV).addReg(Tmp1);
889 BuildMI(BB, PPC::LA, 2, Result).addReg(Tmp1).addGlobalAddress(GV);
897 case ISD::SEXTLOAD: {
898 MVT::ValueType TypeBeingLoaded = (ISD::LOAD == opcode) ?
899 Node->getValueType(0) : cast<VTSDNode>(Node->getOperand(3))->getVT();
900 bool sext = (ISD::SEXTLOAD == opcode);
902 // Make sure we generate both values.
904 ExprMap[N.getValue(1)] = 1; // Generate the token
906 Result = ExprMap[N.getValue(0)] = MakeReg(N.getValue(0).getValueType());
908 SDOperand Chain = N.getOperand(0);
909 SDOperand Address = N.getOperand(1);
912 switch (TypeBeingLoaded) {
913 default: Node->dump(); assert(0 && "Cannot load this type!");
914 case MVT::i1: Opc = PPC::LBZ; break;
915 case MVT::i8: Opc = PPC::LBZ; break;
916 case MVT::i16: Opc = sext ? PPC::LHA : PPC::LHZ; break;
917 case MVT::i32: Opc = PPC::LWZ; break;
918 case MVT::f32: Opc = PPC::LFS; break;
919 case MVT::f64: Opc = PPC::LFD; break;
922 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Address)) {
924 int CPI = CP->getIndex();
926 BuildMI(BB, PPC::ADDIS, 2, Tmp1).addReg(getGlobalBaseReg())
927 .addConstantPoolIndex(CPI);
929 BuildMI(BB, PPC::LIS, 1, Tmp1).addConstantPoolIndex(CPI);
930 BuildMI(BB, Opc, 2, Result).addConstantPoolIndex(CPI).addReg(Tmp1);
931 } else if (Address.getOpcode() == ISD::FrameIndex) {
932 Tmp1 = cast<FrameIndexSDNode>(Address)->getIndex();
933 addFrameReference(BuildMI(BB, Opc, 2, Result), (int)Tmp1);
936 switch(SelectAddr(Address, Tmp1, offset)) {
937 default: assert(0 && "Unhandled return value from SelectAddr");
938 case 0: // imm offset, no frame, no index
939 BuildMI(BB, Opc, 2, Result).addSImm(offset).addReg(Tmp1);
941 case 1: // imm offset + frame index
942 addFrameReference(BuildMI(BB, Opc, 2, Result), (int)Tmp1, offset);
944 case 2: // base+index addressing
945 Opc = IndexedOpForOp(Opc);
946 BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(offset);
949 GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(Address);
950 GlobalValue *GV = GN->getGlobal();
951 BuildMI(BB, Opc, 2, Result).addGlobalAddress(GV).addReg(Tmp1);
960 unsigned GPR_idx = 0, FPR_idx = 0;
961 static const unsigned GPR[] = {
962 PPC::R3, PPC::R4, PPC::R5, PPC::R6,
963 PPC::R7, PPC::R8, PPC::R9, PPC::R10,
965 static const unsigned FPR[] = {
966 PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
967 PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
970 // Lower the chain for this call.
971 Select(N.getOperand(0));
972 ExprMap[N.getValue(Node->getNumValues()-1)] = 1;
974 MachineInstr *CallMI;
975 // Emit the correct call instruction based on the type of symbol called.
976 if (GlobalAddressSDNode *GASD =
977 dyn_cast<GlobalAddressSDNode>(N.getOperand(1))) {
978 CallMI = BuildMI(PPC::CALLpcrel, 1).addGlobalAddress(GASD->getGlobal(),
980 } else if (ExternalSymbolSDNode *ESSDN =
981 dyn_cast<ExternalSymbolSDNode>(N.getOperand(1))) {
982 CallMI = BuildMI(PPC::CALLpcrel, 1).addExternalSymbol(ESSDN->getSymbol(),
985 Tmp1 = SelectExpr(N.getOperand(1));
986 BuildMI(BB, PPC::MTCTR, 1).addReg(Tmp1);
987 BuildMI(BB, PPC::OR, 2, PPC::R12).addReg(Tmp1).addReg(Tmp1);
988 CallMI = BuildMI(PPC::CALLindirect, 3).addImm(20).addImm(0)
992 // Load the register args to virtual regs
993 std::vector<unsigned> ArgVR;
994 for(int i = 2, e = Node->getNumOperands(); i < e; ++i)
995 ArgVR.push_back(SelectExpr(N.getOperand(i)));
997 // Copy the virtual registers into the appropriate argument register
998 for(int i = 0, e = ArgVR.size(); i < e; ++i) {
999 switch(N.getOperand(i+2).getValueType()) {
1000 default: Node->dump(); assert(0 && "Unknown value type for call");
1002 assert(GPR_idx < 8 && "Too many int args");
1003 if (N.getOperand(i+2).getOpcode() != ISD::UNDEF) {
1004 BuildMI(BB, PPC::OR,2,GPR[GPR_idx]).addReg(ArgVR[i]).addReg(ArgVR[i]);
1005 CallMI->addRegOperand(GPR[GPR_idx], MachineOperand::Use);
1011 assert(FPR_idx < 13 && "Too many fp args");
1012 BuildMI(BB, PPC::FMR, 1, FPR[FPR_idx]).addReg(ArgVR[i]);
1013 CallMI->addRegOperand(FPR[FPR_idx], MachineOperand::Use);
1019 // Put the call instruction in the correct place in the MachineBasicBlock
1020 BB->push_back(CallMI);
1022 switch (Node->getValueType(0)) {
1023 default: assert(0 && "Unknown value type for call result!");
1024 case MVT::Other: return 1;
1026 if (Node->getValueType(1) == MVT::i32) {
1027 BuildMI(BB, PPC::OR, 2, Result+1).addReg(PPC::R3).addReg(PPC::R3);
1028 BuildMI(BB, PPC::OR, 2, Result).addReg(PPC::R4).addReg(PPC::R4);
1030 BuildMI(BB, PPC::OR, 2, Result).addReg(PPC::R3).addReg(PPC::R3);
1035 BuildMI(BB, PPC::FMR, 1, Result).addReg(PPC::F1);
1038 return Result+N.ResNo;
1041 case ISD::SIGN_EXTEND:
1042 case ISD::SIGN_EXTEND_INREG:
1043 Tmp1 = SelectExpr(N.getOperand(0));
1044 switch(cast<VTSDNode>(Node->getOperand(1))->getVT()) {
1045 default: Node->dump(); assert(0 && "Unhandled SIGN_EXTEND type"); break;
1047 BuildMI(BB, PPC::EXTSH, 1, Result).addReg(Tmp1);
1050 BuildMI(BB, PPC::EXTSB, 1, Result).addReg(Tmp1);
1055 case ISD::CopyFromReg:
1056 DestType = N.getValue(0).getValueType();
1058 Result = ExprMap[N.getValue(0)] = MakeReg(DestType);
1059 Tmp1 = dyn_cast<RegisterSDNode>(Node->getOperand(1))->getReg();
1060 if (MVT::isInteger(DestType))
1061 BuildMI(BB, PPC::OR, 2, Result).addReg(Tmp1).addReg(Tmp1);
1063 BuildMI(BB, PPC::FMR, 1, Result).addReg(Tmp1);
1067 if (isIntImmediate(N.getOperand(1), Tmp2)) {
1068 unsigned SH, MB, ME;
1069 if (isOpcWithIntImmediate(N.getOperand(0), ISD::AND, Tmp3) &&
1070 isRotateAndMask(ISD::SHL, Tmp2, Tmp3, true, SH, MB, ME)) {
1071 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1072 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(SH)
1073 .addImm(MB).addImm(ME);
1076 Tmp1 = SelectExpr(N.getOperand(0));
1078 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(Tmp2).addImm(0)
1081 Tmp1 = SelectExpr(N.getOperand(0));
1082 Tmp2 = FoldIfWideZeroExtend(N.getOperand(1));
1083 BuildMI(BB, PPC::SLW, 2, Result).addReg(Tmp1).addReg(Tmp2);
1088 if (isIntImmediate(N.getOperand(1), Tmp2)) {
1089 unsigned SH, MB, ME;
1090 if (isOpcWithIntImmediate(N.getOperand(0), ISD::AND, Tmp3) &&
1091 isRotateAndMask(ISD::SRL, Tmp2, Tmp3, true, SH, MB, ME)) {
1092 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1093 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(SH)
1094 .addImm(MB).addImm(ME);
1097 Tmp1 = SelectExpr(N.getOperand(0));
1099 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(32-Tmp2)
1100 .addImm(Tmp2).addImm(31);
1102 Tmp1 = SelectExpr(N.getOperand(0));
1103 Tmp2 = FoldIfWideZeroExtend(N.getOperand(1));
1104 BuildMI(BB, PPC::SRW, 2, Result).addReg(Tmp1).addReg(Tmp2);
1109 if (isIntImmediate(N.getOperand(1), Tmp2)) {
1110 unsigned SH, MB, ME;
1111 if (isOpcWithIntImmediate(N.getOperand(0), ISD::AND, Tmp3) &&
1112 isRotateAndMask(ISD::SRA, Tmp2, Tmp3, true, SH, MB, ME)) {
1113 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1114 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(SH)
1115 .addImm(MB).addImm(ME);
1118 Tmp1 = SelectExpr(N.getOperand(0));
1120 BuildMI(BB, PPC::SRAWI, 2, Result).addReg(Tmp1).addImm(Tmp2);
1122 Tmp1 = SelectExpr(N.getOperand(0));
1123 Tmp2 = FoldIfWideZeroExtend(N.getOperand(1));
1124 BuildMI(BB, PPC::SRAW, 2, Result).addReg(Tmp1).addReg(Tmp2);
1129 Tmp1 = SelectExpr(N.getOperand(0));
1130 BuildMI(BB, PPC::CNTLZW, 1, Result).addReg(Tmp1);
1134 if (!MVT::isInteger(DestType)) {
1135 if (!NoExcessFPPrecision && N.getOperand(0).getOpcode() == ISD::MUL &&
1136 N.getOperand(0).Val->hasOneUse()) {
1137 ++FusedFP; // Statistic
1138 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1139 Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
1140 Tmp3 = SelectExpr(N.getOperand(1));
1141 Opc = DestType == MVT::f64 ? PPC::FMADD : PPC::FMADDS;
1142 BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
1145 if (!NoExcessFPPrecision && N.getOperand(1).getOpcode() == ISD::MUL &&
1146 N.getOperand(1).Val->hasOneUse()) {
1147 ++FusedFP; // Statistic
1148 Tmp1 = SelectExpr(N.getOperand(1).getOperand(0));
1149 Tmp2 = SelectExpr(N.getOperand(1).getOperand(1));
1150 Tmp3 = SelectExpr(N.getOperand(0));
1151 Opc = DestType == MVT::f64 ? PPC::FMADD : PPC::FMADDS;
1152 BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
1155 Opc = DestType == MVT::f64 ? PPC::FADD : PPC::FADDS;
1156 Tmp1 = SelectExpr(N.getOperand(0));
1157 Tmp2 = SelectExpr(N.getOperand(1));
1158 BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
1161 if (SelectIntImmediateExpr(N, Result, PPC::ADDIS, PPC::ADDI, true))
1163 Tmp1 = SelectExpr(N.getOperand(0));
1164 Tmp2 = SelectExpr(N.getOperand(1));
1165 BuildMI(BB, PPC::ADD, 2, Result).addReg(Tmp1).addReg(Tmp2);
1169 if (isIntImmediate(N.getOperand(1), Tmp2)) {
1170 if (isShiftedMask_32(Tmp2) || isShiftedMask_32(~Tmp2)) {
1171 unsigned SH, MB, ME;
1172 Opc = Recording ? PPC::RLWINMo : PPC::RLWINM;
1174 if (isOprShiftImm(N.getOperand(0), OprOpc, Tmp3) &&
1175 isRotateAndMask(OprOpc, Tmp3, Tmp2, false, SH, MB, ME)) {
1176 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1178 Tmp1 = SelectExpr(N.getOperand(0));
1179 isRunOfOnes(Tmp2, MB, ME);
1182 BuildMI(BB, Opc, 4, Result).addReg(Tmp1).addImm(SH)
1183 .addImm(MB).addImm(ME);
1184 RecordSuccess = true;
1186 } else if (isUInt16(Tmp2)) {
1188 Tmp1 = SelectExpr(N.getOperand(0));
1189 BuildMI(BB, PPC::ANDIo, 2, Result).addReg(Tmp1).addImm(Tmp2);
1190 RecordSuccess = true;
1192 } else if (isUInt16(Tmp2)) {
1194 Tmp1 = SelectExpr(N.getOperand(0));
1195 BuildMI(BB, PPC::ANDISo, 2, Result).addReg(Tmp1).addImm(Tmp2);
1196 RecordSuccess = true;
1200 if (isOprNot(N.getOperand(1))) {
1201 Tmp1 = SelectExpr(N.getOperand(0));
1202 Tmp2 = SelectExpr(N.getOperand(1).getOperand(0));
1203 BuildMI(BB, PPC::ANDC, 2, Result).addReg(Tmp1).addReg(Tmp2);
1204 RecordSuccess = false;
1207 if (isOprNot(N.getOperand(0))) {
1208 Tmp1 = SelectExpr(N.getOperand(1));
1209 Tmp2 = SelectExpr(N.getOperand(0).getOperand(0));
1210 BuildMI(BB, PPC::ANDC, 2, Result).addReg(Tmp1).addReg(Tmp2);
1211 RecordSuccess = false;
1214 // emit a regular and
1215 Tmp1 = SelectExpr(N.getOperand(0));
1216 Tmp2 = SelectExpr(N.getOperand(1));
1217 Opc = Recording ? PPC::ANDo : PPC::AND;
1218 BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
1219 RecordSuccess = true;
1223 if (SelectBitfieldInsert(N, Result))
1225 if (SelectIntImmediateExpr(N, Result, PPC::ORIS, PPC::ORI))
1227 if (isOprNot(N.getOperand(1))) {
1228 Tmp1 = SelectExpr(N.getOperand(0));
1229 Tmp2 = SelectExpr(N.getOperand(1).getOperand(0));
1230 BuildMI(BB, PPC::ORC, 2, Result).addReg(Tmp1).addReg(Tmp2);
1231 RecordSuccess = false;
1234 if (isOprNot(N.getOperand(0))) {
1235 Tmp1 = SelectExpr(N.getOperand(1));
1236 Tmp2 = SelectExpr(N.getOperand(0).getOperand(0));
1237 BuildMI(BB, PPC::ORC, 2, Result).addReg(Tmp1).addReg(Tmp2);
1238 RecordSuccess = false;
1242 Tmp1 = SelectExpr(N.getOperand(0));
1243 Tmp2 = SelectExpr(N.getOperand(1));
1244 Opc = Recording ? PPC::ORo : PPC::OR;
1245 RecordSuccess = true;
1246 BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
1250 // Check for EQV: xor, (xor a, -1), b
1251 if (isOprNot(N.getOperand(0))) {
1252 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1253 Tmp2 = SelectExpr(N.getOperand(1));
1254 BuildMI(BB, PPC::EQV, 2, Result).addReg(Tmp1).addReg(Tmp2);
1257 // Check for NOT, NOR, EQV, and NAND: xor (copy, or, xor, and), -1
1259 switch(N.getOperand(0).getOpcode()) {
1261 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1262 Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
1263 BuildMI(BB, PPC::NOR, 2, Result).addReg(Tmp1).addReg(Tmp2);
1266 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1267 Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
1268 BuildMI(BB, PPC::NAND, 2, Result).addReg(Tmp1).addReg(Tmp2);
1271 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1272 Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
1273 BuildMI(BB, PPC::EQV, 2, Result).addReg(Tmp1).addReg(Tmp2);
1276 Tmp1 = SelectExpr(N.getOperand(0));
1277 BuildMI(BB, PPC::NOR, 2, Result).addReg(Tmp1).addReg(Tmp1);
1282 if (SelectIntImmediateExpr(N, Result, PPC::XORIS, PPC::XORI))
1285 Tmp1 = SelectExpr(N.getOperand(0));
1286 Tmp2 = SelectExpr(N.getOperand(1));
1287 BuildMI(BB, PPC::XOR, 2, Result).addReg(Tmp1).addReg(Tmp2);
1292 if (!MVT::isInteger(DestType)) {
1293 if (!NoExcessFPPrecision && N.getOperand(0).getOpcode() == ISD::MUL &&
1294 N.getOperand(0).Val->hasOneUse()) {
1295 ++FusedFP; // Statistic
1296 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1297 Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
1298 Tmp3 = SelectExpr(N.getOperand(1));
1299 Opc = DestType == MVT::f64 ? PPC::FMSUB : PPC::FMSUBS;
1300 BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
1303 if (!NoExcessFPPrecision && N.getOperand(1).getOpcode() == ISD::MUL &&
1304 N.getOperand(1).Val->hasOneUse()) {
1305 ++FusedFP; // Statistic
1306 Tmp1 = SelectExpr(N.getOperand(1).getOperand(0));
1307 Tmp2 = SelectExpr(N.getOperand(1).getOperand(1));
1308 Tmp3 = SelectExpr(N.getOperand(0));
1309 Opc = DestType == MVT::f64 ? PPC::FNMSUB : PPC::FNMSUBS;
1310 BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
1313 Opc = DestType == MVT::f64 ? PPC::FSUB : PPC::FSUBS;
1314 Tmp1 = SelectExpr(N.getOperand(0));
1315 Tmp2 = SelectExpr(N.getOperand(1));
1316 BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
1319 if (isIntImmediate(N.getOperand(0), Tmp1) && isInt16(Tmp1)) {
1321 Tmp2 = SelectExpr(N.getOperand(1));
1323 BuildMI(BB, PPC::NEG, 1, Result).addReg(Tmp2);
1325 BuildMI(BB, PPC::SUBFIC, 2, Result).addReg(Tmp2).addSImm(Tmp1);
1328 if (SelectIntImmediateExpr(N, Result, PPC::ADDIS, PPC::ADDI, true, true))
1330 Tmp1 = SelectExpr(N.getOperand(0));
1331 Tmp2 = SelectExpr(N.getOperand(1));
1332 BuildMI(BB, PPC::SUBF, 2, Result).addReg(Tmp2).addReg(Tmp1);
1336 Tmp1 = SelectExpr(N.getOperand(0));
1337 if (isIntImmediate(N.getOperand(1), Tmp2) && isInt16(Tmp2)) {
1339 BuildMI(BB, PPC::MULLI, 2, Result).addReg(Tmp1).addSImm(Tmp2);
1341 Tmp2 = SelectExpr(N.getOperand(1));
1343 default: assert(0 && "Unknown type to ISD::MUL"); break;
1344 case MVT::i32: Opc = PPC::MULLW; break;
1345 case MVT::f32: Opc = PPC::FMULS; break;
1346 case MVT::f64: Opc = PPC::FMUL; break;
1348 BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
1354 Tmp1 = SelectExpr(N.getOperand(0));
1355 Tmp2 = SelectExpr(N.getOperand(1));
1356 Opc = (ISD::MULHU == opcode) ? PPC::MULHWU : PPC::MULHW;
1357 BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
1361 if (isIntImmediate(N.getOperand(1), Tmp3)) {
1362 if ((signed)Tmp3 > 0 && isPowerOf2_32(Tmp3)) {
1363 Tmp3 = Log2_32(Tmp3);
1364 Tmp1 = MakeIntReg();
1365 Tmp2 = SelectExpr(N.getOperand(0));
1366 BuildMI(BB, PPC::SRAWI, 2, Tmp1).addReg(Tmp2).addImm(Tmp3);
1367 BuildMI(BB, PPC::ADDZE, 1, Result).addReg(Tmp1);
1369 } else if ((signed)Tmp3 < 0 && isPowerOf2_32(-Tmp3)) {
1370 Tmp3 = Log2_32(-Tmp3);
1371 Tmp2 = SelectExpr(N.getOperand(0));
1372 Tmp1 = MakeIntReg();
1373 unsigned Tmp4 = MakeIntReg();
1374 BuildMI(BB, PPC::SRAWI, 2, Tmp1).addReg(Tmp2).addImm(Tmp3);
1375 BuildMI(BB, PPC::ADDZE, 1, Tmp4).addReg(Tmp1);
1376 BuildMI(BB, PPC::NEG, 1, Result).addReg(Tmp4);
1380 return SelectExpr(BuildSDIVSequence(N));
1385 // If this is a divide by constant, we can emit code using some magic
1386 // constants to implement it as a multiply instead.
1387 if (isIntImmediate(N.getOperand(1), Tmp3) && Tmp3) {
1389 return SelectExpr(BuildUDIVSequence(N));
1391 Tmp1 = SelectExpr(N.getOperand(0));
1392 Tmp2 = SelectExpr(N.getOperand(1));
1394 default: assert(0 && "Unknown type to ISD::DIV"); break;
1395 case MVT::i32: Opc = (ISD::UDIV == opcode) ? PPC::DIVWU : PPC::DIVW; break;
1396 case MVT::f32: Opc = PPC::FDIVS; break;
1397 case MVT::f64: Opc = PPC::FDIV; break;
1399 BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
1402 case ISD::ADD_PARTS:
1403 case ISD::SUB_PARTS: {
1404 assert(N.getNumOperands() == 4 && N.getValueType() == MVT::i32 &&
1405 "Not an i64 add/sub!");
1407 Tmp1 = SelectExpr(N.getOperand(0));
1408 Tmp2 = SelectExpr(N.getOperand(1));
1410 if (N.getOpcode() == ISD::ADD_PARTS) {
1412 if (isIntImmediate(N.getOperand(3), Tmp3)) {
1413 ME = (signed)Tmp3 == -1;
1418 Tmp4 = SelectExpr(N.getOperand(3));
1420 if (isIntImmediate(N.getOperand(2), Tmp3) &&
1421 ((signed)Tmp3 >= -32768 || (signed)Tmp3 < 32768)) {
1422 // Codegen the low 32 bits of the add. Interestingly, there is no
1423 // shifted form of add immediate carrying.
1424 BuildMI(BB, PPC::ADDIC, 2, Result).addReg(Tmp1).addSImm(Tmp3);
1426 Tmp3 = SelectExpr(N.getOperand(2));
1427 BuildMI(BB, PPC::ADDC, 2, Result).addReg(Tmp1).addReg(Tmp3);
1430 // Codegen the high 32 bits, adding zero, minus one, or the full value
1431 // along with the carry flag produced by addc/addic to tmp2.
1433 BuildMI(BB, PPC::ADDZE, 1, Result+1).addReg(Tmp2);
1435 BuildMI(BB, PPC::ADDME, 1, Result+1).addReg(Tmp2);
1437 BuildMI(BB, PPC::ADDE, 2, Result+1).addReg(Tmp2).addReg(Tmp4);
1440 Tmp3 = SelectExpr(N.getOperand(2));
1441 Tmp4 = SelectExpr(N.getOperand(3));
1442 BuildMI(BB, PPC::SUBFC, 2, Result).addReg(Tmp3).addReg(Tmp1);
1443 BuildMI(BB, PPC::SUBFE, 2, Result+1).addReg(Tmp4).addReg(Tmp2);
1445 return Result+N.ResNo;
1448 case ISD::SHL_PARTS:
1449 case ISD::SRA_PARTS:
1450 case ISD::SRL_PARTS: {
1451 assert(N.getNumOperands() == 3 && N.getValueType() == MVT::i32 &&
1452 "Not an i64 shift!");
1453 unsigned ShiftOpLo = SelectExpr(N.getOperand(0));
1454 unsigned ShiftOpHi = SelectExpr(N.getOperand(1));
1455 unsigned SHReg = FoldIfWideZeroExtend(N.getOperand(2));
1456 Tmp1 = MakeIntReg();
1457 Tmp2 = MakeIntReg();
1458 Tmp3 = MakeIntReg();
1459 unsigned Tmp4 = MakeIntReg();
1460 unsigned Tmp5 = MakeIntReg();
1461 unsigned Tmp6 = MakeIntReg();
1462 BuildMI(BB, PPC::SUBFIC, 2, Tmp1).addReg(SHReg).addSImm(32);
1463 if (ISD::SHL_PARTS == opcode) {
1464 BuildMI(BB, PPC::SLW, 2, Tmp2).addReg(ShiftOpHi).addReg(SHReg);
1465 BuildMI(BB, PPC::SRW, 2, Tmp3).addReg(ShiftOpLo).addReg(Tmp1);
1466 BuildMI(BB, PPC::OR, 2, Tmp4).addReg(Tmp2).addReg(Tmp3);
1467 BuildMI(BB, PPC::ADDI, 2, Tmp5).addReg(SHReg).addSImm(-32);
1468 BuildMI(BB, PPC::SLW, 2, Tmp6).addReg(ShiftOpLo).addReg(Tmp5);
1469 BuildMI(BB, PPC::OR, 2, Result+1).addReg(Tmp4).addReg(Tmp6);
1470 BuildMI(BB, PPC::SLW, 2, Result).addReg(ShiftOpLo).addReg(SHReg);
1471 } else if (ISD::SRL_PARTS == opcode) {
1472 BuildMI(BB, PPC::SRW, 2, Tmp2).addReg(ShiftOpLo).addReg(SHReg);
1473 BuildMI(BB, PPC::SLW, 2, Tmp3).addReg(ShiftOpHi).addReg(Tmp1);
1474 BuildMI(BB, PPC::OR, 2, Tmp4).addReg(Tmp2).addReg(Tmp3);
1475 BuildMI(BB, PPC::ADDI, 2, Tmp5).addReg(SHReg).addSImm(-32);
1476 BuildMI(BB, PPC::SRW, 2, Tmp6).addReg(ShiftOpHi).addReg(Tmp5);
1477 BuildMI(BB, PPC::OR, 2, Result).addReg(Tmp4).addReg(Tmp6);
1478 BuildMI(BB, PPC::SRW, 2, Result+1).addReg(ShiftOpHi).addReg(SHReg);
1480 MachineBasicBlock *TmpMBB = new MachineBasicBlock(BB->getBasicBlock());
1481 MachineBasicBlock *PhiMBB = new MachineBasicBlock(BB->getBasicBlock());
1482 MachineBasicBlock *OldMBB = BB;
1483 MachineFunction *F = BB->getParent();
1484 ilist<MachineBasicBlock>::iterator It = BB; ++It;
1485 F->getBasicBlockList().insert(It, TmpMBB);
1486 F->getBasicBlockList().insert(It, PhiMBB);
1487 BB->addSuccessor(TmpMBB);
1488 BB->addSuccessor(PhiMBB);
1489 BuildMI(BB, PPC::SRW, 2, Tmp2).addReg(ShiftOpLo).addReg(SHReg);
1490 BuildMI(BB, PPC::SLW, 2, Tmp3).addReg(ShiftOpHi).addReg(Tmp1);
1491 BuildMI(BB, PPC::OR, 2, Tmp4).addReg(Tmp2).addReg(Tmp3);
1492 BuildMI(BB, PPC::ADDICo, 2, Tmp5).addReg(SHReg).addSImm(-32);
1493 BuildMI(BB, PPC::SRAW, 2, Tmp6).addReg(ShiftOpHi).addReg(Tmp5);
1494 BuildMI(BB, PPC::SRAW, 2, Result+1).addReg(ShiftOpHi).addReg(SHReg);
1495 BuildMI(BB, PPC::BLE, 2).addReg(PPC::CR0).addMBB(PhiMBB);
1496 // Select correct least significant half if the shift amount > 32
1498 unsigned Tmp7 = MakeIntReg();
1499 BuildMI(BB, PPC::OR, 2, Tmp7).addReg(Tmp6).addReg(Tmp6);
1500 TmpMBB->addSuccessor(PhiMBB);
1502 BuildMI(BB, PPC::PHI, 4, Result).addReg(Tmp4).addMBB(OldMBB)
1503 .addReg(Tmp7).addMBB(TmpMBB);
1505 return Result+N.ResNo;
1508 case ISD::FP_TO_SINT: {
1509 Tmp1 = SelectExpr(N.getOperand(0));
1511 BuildMI(BB, PPC::FCTIWZ, 1, Tmp2).addReg(Tmp1);
1512 int FrameIdx = BB->getParent()->getFrameInfo()->CreateStackObject(8, 8);
1513 addFrameReference(BuildMI(BB, PPC::STFD, 3).addReg(Tmp2), FrameIdx);
1514 addFrameReference(BuildMI(BB, PPC::LWZ, 2, Result), FrameIdx, 4);
1519 ISD::CondCode CC = cast<CondCodeSDNode>(Node->getOperand(2))->get();
1520 if (isIntImmediate(Node->getOperand(1), Tmp3)) {
1521 // We can codegen setcc op, imm very efficiently compared to a brcond.
1522 // Check for those cases here.
1525 Tmp1 = SelectExpr(Node->getOperand(0));
1527 default: Node->dump(); assert(0 && "Unhandled SetCC condition");abort();
1529 Tmp2 = MakeIntReg();
1530 BuildMI(BB, PPC::CNTLZW, 1, Tmp2).addReg(Tmp1);
1531 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp2).addImm(27)
1532 .addImm(5).addImm(31);
1535 Tmp2 = MakeIntReg();
1536 BuildMI(BB, PPC::ADDIC, 2, Tmp2).addReg(Tmp1).addSImm(-1);
1537 BuildMI(BB, PPC::SUBFE, 2, Result).addReg(Tmp2).addReg(Tmp1);
1540 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(1)
1541 .addImm(31).addImm(31);
1544 Tmp2 = MakeIntReg();
1545 Tmp3 = MakeIntReg();
1546 BuildMI(BB, PPC::NEG, 2, Tmp2).addReg(Tmp1);
1547 BuildMI(BB, PPC::ANDC, 2, Tmp3).addReg(Tmp2).addReg(Tmp1);
1548 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp3).addImm(1)
1549 .addImm(31).addImm(31);
1553 } else if (Tmp3 == ~0U) { // setcc op, -1
1554 Tmp1 = SelectExpr(Node->getOperand(0));
1556 default: assert(0 && "Unhandled SetCC condition"); abort();
1558 Tmp2 = MakeIntReg();
1559 Tmp3 = MakeIntReg();
1560 BuildMI(BB, PPC::ADDIC, 2, Tmp2).addReg(Tmp1).addSImm(1);
1561 BuildMI(BB, PPC::LI, 1, Tmp3).addSImm(0);
1562 BuildMI(BB, PPC::ADDZE, 1, Result).addReg(Tmp3);
1565 Tmp2 = MakeIntReg();
1566 Tmp3 = MakeIntReg();
1567 BuildMI(BB, PPC::NOR, 2, Tmp2).addReg(Tmp1).addReg(Tmp1);
1568 BuildMI(BB, PPC::ADDIC, 2, Tmp3).addReg(Tmp2).addSImm(-1);
1569 BuildMI(BB, PPC::SUBFE, 2, Result).addReg(Tmp3).addReg(Tmp2);
1572 Tmp2 = MakeIntReg();
1573 Tmp3 = MakeIntReg();
1574 BuildMI(BB, PPC::ADDI, 2, Tmp2).addReg(Tmp1).addSImm(1);
1575 BuildMI(BB, PPC::AND, 2, Tmp3).addReg(Tmp2).addReg(Tmp1);
1576 BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp3).addImm(1)
1577 .addImm(31).addImm(31);
1580 Tmp2 = MakeIntReg();
1581 BuildMI(BB, PPC::RLWINM, 4, Tmp2).addReg(Tmp1).addImm(1)
1582 .addImm(31).addImm(31);
1583 BuildMI(BB, PPC::XORI, 2, Result).addReg(Tmp2).addImm(1);
1590 unsigned CCReg = SelectCC(N.getOperand(0), N.getOperand(1), CC);
1591 MoveCRtoGPR(CCReg, CC, Result);
1595 case ISD::SELECT_CC: {
1596 ISD::CondCode CC = cast<CondCodeSDNode>(N.getOperand(4))->get();
1597 if (!MVT::isInteger(N.getOperand(0).getValueType()) &&
1598 !MVT::isInteger(N.getOperand(2).getValueType()) &&
1599 CC != ISD::SETEQ && CC != ISD::SETNE) {
1600 MVT::ValueType VT = N.getOperand(0).getValueType();
1601 unsigned TV = SelectExpr(N.getOperand(2)); // Use if TRUE
1602 unsigned FV = SelectExpr(N.getOperand(3)); // Use if FALSE
1604 ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(N.getOperand(1));
1605 if (CN && (CN->isExactlyValue(-0.0) || CN->isExactlyValue(0.0))) {
1607 default: assert(0 && "Invalid FSEL condition"); abort();
1610 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
1613 Tmp1 = SelectExpr(N.getOperand(0)); // Val to compare against
1614 BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp1).addReg(TV).addReg(FV);
1618 std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
1621 if (N.getOperand(0).getOpcode() == ISD::FNEG) {
1622 Tmp2 = SelectExpr(N.getOperand(0).getOperand(0));
1625 Tmp1 = SelectExpr(N.getOperand(0)); // Val to compare against
1626 BuildMI(BB, PPC::FNEG, 1, Tmp2).addReg(Tmp1);
1628 BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp2).addReg(TV).addReg(FV);
1633 Opc = (MVT::f64 == VT) ? PPC::FSUB : PPC::FSUBS;
1634 Tmp1 = SelectExpr(N.getOperand(0)); // Val to compare against
1635 Tmp2 = SelectExpr(N.getOperand(1));
1638 default: assert(0 && "Invalid FSEL condition"); abort();
1641 BuildMI(BB, Opc, 2, Tmp3).addReg(Tmp1).addReg(Tmp2);
1642 BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp3).addReg(FV).addReg(TV);
1646 BuildMI(BB, Opc, 2, Tmp3).addReg(Tmp1).addReg(Tmp2);
1647 BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp3).addReg(TV).addReg(FV);
1651 BuildMI(BB, Opc, 2, Tmp3).addReg(Tmp2).addReg(Tmp1);
1652 BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp3).addReg(FV).addReg(TV);
1656 BuildMI(BB, Opc, 2, Tmp3).addReg(Tmp2).addReg(Tmp1);
1657 BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp3).addReg(TV).addReg(FV);
1661 assert(0 && "Should never get here");
1664 // handle the setcc cases here. select_cc lhs, 0, 1, 0, cc
1665 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N.getOperand(1));
1666 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N.getOperand(2));
1667 ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N.getOperand(3));
1668 if (N1C && N2C && N3C && N1C->isNullValue() && N3C->isNullValue() &&
1669 N2C->getValue() == 1ULL && CC == ISD::SETNE) {
1670 Tmp1 = SelectExpr(Node->getOperand(0));
1671 Tmp2 = MakeIntReg();
1672 BuildMI(BB, PPC::ADDIC, 2, Tmp2).addReg(Tmp1).addSImm(-1);
1673 BuildMI(BB, PPC::SUBFE, 2, Result).addReg(Tmp2).addReg(Tmp1);
1677 // If the False value only has one use, we can generate better code by
1678 // selecting it in the fallthrough basic block rather than here, which
1679 // increases register pressure.
1680 unsigned TrueValue = SelectExpr(N.getOperand(2));
1681 unsigned FalseValue;
1683 // If the false value is simple enough, evaluate it inline in the false
1685 if (N.getOperand(3).Val->hasOneUse() &&
1686 (isa<ConstantSDNode>(N.getOperand(3)) ||
1687 isa<ConstantFPSDNode>(N.getOperand(3)) ||
1688 isa<GlobalAddressSDNode>(N.getOperand(3))))
1691 FalseValue = SelectExpr(N.getOperand(3));
1692 unsigned CCReg = SelectCC(N.getOperand(0), N.getOperand(1), CC);
1693 Opc = getBCCForSetCC(CC);
1695 // Create an iterator with which to insert the MBB for copying the false
1696 // value and the MBB to hold the PHI instruction for this SetCC.
1697 MachineBasicBlock *thisMBB = BB;
1698 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1699 ilist<MachineBasicBlock>::iterator It = BB;
1705 // cmpTY ccX, r1, r2
1707 // fallthrough --> copy0MBB
1708 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
1709 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
1710 BuildMI(BB, Opc, 2).addReg(CCReg).addMBB(sinkMBB);
1711 MachineFunction *F = BB->getParent();
1712 F->getBasicBlockList().insert(It, copy0MBB);
1713 F->getBasicBlockList().insert(It, sinkMBB);
1714 // Update machine-CFG edges
1715 BB->addSuccessor(copy0MBB);
1716 BB->addSuccessor(sinkMBB);
1719 // %FalseValue = ...
1720 // # fallthrough to sinkMBB
1723 // If the false value is simple enough, evaluate it here, to avoid it being
1724 // evaluated on the true edge.
1725 if (FalseValue == 0)
1726 FalseValue = SelectExpr(N.getOperand(3));
1728 // Update machine-CFG edges
1729 BB->addSuccessor(sinkMBB);
1732 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1735 BuildMI(BB, PPC::PHI, 4, Result).addReg(FalseValue)
1736 .addMBB(copy0MBB).addReg(TrueValue).addMBB(thisMBB);
1740 case ISD::Constant: {
1741 assert(N.getValueType() == MVT::i32 &&
1742 "Only i32 constants are legal on this target!");
1743 unsigned v = (unsigned)cast<ConstantSDNode>(N)->getValue();
1745 BuildMI(BB, PPC::LI, 1, Result).addSImm(Lo16(v));
1747 unsigned Hi = Hi16(v);
1748 unsigned Lo = Lo16(v);
1750 Tmp1 = MakeIntReg();
1751 BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(Hi);
1752 BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(Lo);
1754 BuildMI(BB, PPC::LIS, 1, Result).addSImm(Hi);
1760 case ISD::ConstantFP: {
1761 ConstantFPSDNode *CN = cast<ConstantFPSDNode>(N);
1762 Result = getConstDouble(CN->getValue(), Result);
1767 if (!NoExcessFPPrecision &&
1768 ISD::ADD == N.getOperand(0).getOpcode() &&
1769 N.getOperand(0).Val->hasOneUse() &&
1770 ISD::MUL == N.getOperand(0).getOperand(0).getOpcode() &&
1771 N.getOperand(0).getOperand(0).Val->hasOneUse()) {
1772 ++FusedFP; // Statistic
1773 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0).getOperand(0));
1774 Tmp2 = SelectExpr(N.getOperand(0).getOperand(0).getOperand(1));
1775 Tmp3 = SelectExpr(N.getOperand(0).getOperand(1));
1776 Opc = DestType == MVT::f64 ? PPC::FNMADD : PPC::FNMADDS;
1777 BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
1778 } else if (!NoExcessFPPrecision &&
1779 ISD::ADD == N.getOperand(0).getOpcode() &&
1780 N.getOperand(0).Val->hasOneUse() &&
1781 ISD::MUL == N.getOperand(0).getOperand(1).getOpcode() &&
1782 N.getOperand(0).getOperand(1).Val->hasOneUse()) {
1783 ++FusedFP; // Statistic
1784 Tmp1 = SelectExpr(N.getOperand(0).getOperand(1).getOperand(0));
1785 Tmp2 = SelectExpr(N.getOperand(0).getOperand(1).getOperand(1));
1786 Tmp3 = SelectExpr(N.getOperand(0).getOperand(0));
1787 Opc = DestType == MVT::f64 ? PPC::FNMADD : PPC::FNMADDS;
1788 BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
1789 } else if (ISD::FABS == N.getOperand(0).getOpcode()) {
1790 Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
1791 BuildMI(BB, PPC::FNABS, 1, Result).addReg(Tmp1);
1793 Tmp1 = SelectExpr(N.getOperand(0));
1794 BuildMI(BB, PPC::FNEG, 1, Result).addReg(Tmp1);
1799 Tmp1 = SelectExpr(N.getOperand(0));
1800 BuildMI(BB, PPC::FABS, 1, Result).addReg(Tmp1);
1804 Tmp1 = SelectExpr(N.getOperand(0));
1805 Opc = DestType == MVT::f64 ? PPC::FSQRT : PPC::FSQRTS;
1806 BuildMI(BB, Opc, 1, Result).addReg(Tmp1);
1810 assert (DestType == MVT::f32 &&
1811 N.getOperand(0).getValueType() == MVT::f64 &&
1812 "only f64 to f32 conversion supported here");
1813 Tmp1 = SelectExpr(N.getOperand(0));
1814 BuildMI(BB, PPC::FRSP, 1, Result).addReg(Tmp1);
1817 case ISD::FP_EXTEND:
1818 assert (DestType == MVT::f64 &&
1819 N.getOperand(0).getValueType() == MVT::f32 &&
1820 "only f32 to f64 conversion supported here");
1821 Tmp1 = SelectExpr(N.getOperand(0));
1822 BuildMI(BB, PPC::FMR, 1, Result).addReg(Tmp1);
1828 void ISel::Select(SDOperand N) {
1829 unsigned Tmp1, Tmp2, Tmp3, Opc;
1830 unsigned opcode = N.getOpcode();
1832 if (!ExprMap.insert(std::make_pair(N, 1)).second)
1833 return; // Already selected.
1835 SDNode *Node = N.Val;
1837 switch (Node->getOpcode()) {
1839 Node->dump(); std::cerr << "\n";
1840 assert(0 && "Node not handled yet!");
1841 case ISD::EntryToken: return; // Noop
1842 case ISD::TokenFactor:
1843 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
1844 Select(Node->getOperand(i));
1846 case ISD::CALLSEQ_START:
1847 case ISD::CALLSEQ_END:
1848 Select(N.getOperand(0));
1849 Tmp1 = cast<ConstantSDNode>(N.getOperand(1))->getValue();
1850 Opc = N.getOpcode() == ISD::CALLSEQ_START ? PPC::ADJCALLSTACKDOWN :
1851 PPC::ADJCALLSTACKUP;
1852 BuildMI(BB, Opc, 1).addImm(Tmp1);
1855 MachineBasicBlock *Dest =
1856 cast<BasicBlockSDNode>(N.getOperand(1))->getBasicBlock();
1857 Select(N.getOperand(0));
1858 BuildMI(BB, PPC::B, 1).addMBB(Dest);
1862 case ISD::BRTWOWAY_CC:
1865 case ISD::CopyToReg:
1866 Select(N.getOperand(0));
1867 Tmp1 = SelectExpr(N.getOperand(2));
1868 Tmp2 = cast<RegisterSDNode>(N.getOperand(1))->getReg();
1871 if (N.getOperand(2).getValueType() == MVT::f64 ||
1872 N.getOperand(2).getValueType() == MVT::f32)
1873 BuildMI(BB, PPC::FMR, 1, Tmp2).addReg(Tmp1);
1875 BuildMI(BB, PPC::OR, 2, Tmp2).addReg(Tmp1).addReg(Tmp1);
1878 case ISD::ImplicitDef:
1879 Select(N.getOperand(0));
1880 Tmp1 = cast<RegisterSDNode>(N.getOperand(1))->getReg();
1881 if (N.getOperand(1).getValueType() == MVT::i32)
1882 BuildMI(BB, PPC::IMPLICIT_DEF_GPR, 0, Tmp1);
1884 BuildMI(BB, PPC::IMPLICIT_DEF_FP, 0, Tmp1);
1887 switch (N.getNumOperands()) {
1889 assert(0 && "Unknown return instruction!");
1891 assert(N.getOperand(1).getValueType() == MVT::i32 &&
1892 N.getOperand(2).getValueType() == MVT::i32 &&
1893 "Unknown two-register value!");
1894 Select(N.getOperand(0));
1895 Tmp1 = SelectExpr(N.getOperand(1));
1896 Tmp2 = SelectExpr(N.getOperand(2));
1897 BuildMI(BB, PPC::OR, 2, PPC::R3).addReg(Tmp2).addReg(Tmp2);
1898 BuildMI(BB, PPC::OR, 2, PPC::R4).addReg(Tmp1).addReg(Tmp1);
1901 Select(N.getOperand(0));
1902 Tmp1 = SelectExpr(N.getOperand(1));
1903 switch (N.getOperand(1).getValueType()) {
1905 assert(0 && "Unknown return type!");
1908 BuildMI(BB, PPC::FMR, 1, PPC::F1).addReg(Tmp1);
1911 BuildMI(BB, PPC::OR, 2, PPC::R3).addReg(Tmp1).addReg(Tmp1);
1915 Select(N.getOperand(0));
1918 BuildMI(BB, PPC::BLR, 0); // Just emit a 'ret' instruction
1920 case ISD::TRUNCSTORE:
1922 SDOperand Chain = N.getOperand(0);
1923 SDOperand Value = N.getOperand(1);
1924 SDOperand Address = N.getOperand(2);
1927 Tmp1 = SelectExpr(Value); //value
1929 if (opcode == ISD::STORE) {
1930 switch(Value.getValueType()) {
1931 default: assert(0 && "unknown Type in store");
1932 case MVT::i32: Opc = PPC::STW; break;
1933 case MVT::f64: Opc = PPC::STFD; break;
1934 case MVT::f32: Opc = PPC::STFS; break;
1936 } else { //ISD::TRUNCSTORE
1937 switch(cast<VTSDNode>(Node->getOperand(4))->getVT()) {
1938 default: assert(0 && "unknown Type in store");
1940 case MVT::i8: Opc = PPC::STB; break;
1941 case MVT::i16: Opc = PPC::STH; break;
1945 if(Address.getOpcode() == ISD::FrameIndex) {
1946 Tmp2 = cast<FrameIndexSDNode>(Address)->getIndex();
1947 addFrameReference(BuildMI(BB, Opc, 3).addReg(Tmp1), (int)Tmp2);
1950 switch(SelectAddr(Address, Tmp2, offset)) {
1951 default: assert(0 && "Unhandled return value from SelectAddr");
1952 case 0: // imm offset, no frame, no index
1953 BuildMI(BB, Opc, 3).addReg(Tmp1).addSImm(offset).addReg(Tmp2);
1955 case 1: // imm offset + frame index
1956 addFrameReference(BuildMI(BB, Opc, 3).addReg(Tmp1), (int)Tmp2, offset);
1958 case 2: // base+index addressing
1959 Opc = IndexedOpForOp(Opc);
1960 BuildMI(BB, Opc, 3).addReg(Tmp1).addReg(Tmp2).addReg(offset);
1963 GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(Address);
1964 GlobalValue *GV = GN->getGlobal();
1965 BuildMI(BB, Opc, 3).addReg(Tmp1).addGlobalAddress(GV).addReg(Tmp2);
1975 case ISD::CopyFromReg:
1978 case ISD::DYNAMIC_STACKALLOC:
1983 assert(0 && "Should not be reached!");
1987 /// createPPC32PatternInstructionSelector - This pass converts an LLVM function
1988 /// into a machine code representation using pattern matching and a machine
1989 /// description file.
1991 FunctionPass *llvm::createPPC32ISelPattern(TargetMachine &TM) {
1992 return new ISel(TM);