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llvm-6502/lib/Target/PowerPC/PPCISelPattern.cpp
Nate Begeman 6957523b9d Move the target constant divide optimization up into the dag combiner, so 
that the nodes can be folded with other nodes, and we can not duplicate
code in every backend.  Alpha will probably want this too.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23835 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-20 02:15:44 +00:00

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//===-- PPC32ISelPattern.cpp - A pattern matching inst selector for PPC32 -===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Nate Begeman and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a pattern matching instruction selector for 32 bit PowerPC.
// Magic number generation for integer divide from the PowerPC Compiler Writer's
// Guide, section 3.2.3.5
//
//===----------------------------------------------------------------------===//
#include "PPC.h"
#include "PPCInstrBuilder.h"
#include "PPCTargetMachine.h"
#include "PPCISelLowering.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/ADT/Statistic.h"
#include <set>
#include <algorithm>
using namespace llvm;
namespace {
Statistic<> Recorded("ppc-codegen", "Number of recording ops emitted");
Statistic<> FusedFP ("ppc-codegen", "Number of fused fp operations");
Statistic<> FrameOff("ppc-codegen", "Number of frame idx offsets collapsed");
//===--------------------------------------------------------------------===//
// ISel - PPC32 specific code to select PPC32 machine instructions for
// SelectionDAG operations.
//===--------------------------------------------------------------------===//
class ISel : public SelectionDAGISel {
PPCTargetLowering PPCLowering;
SelectionDAG *ISelDAG; // Hack to support us having a dag->dag transform
// for sdiv and udiv until it is put into the future
// dag combiner.
/// ExprMap - As shared expressions are codegen'd, we keep track of which
/// vreg the value is produced in, so we only emit one copy of each compiled
/// tree.
std::map<SDOperand, unsigned> ExprMap;
unsigned GlobalBaseReg;
bool GlobalBaseInitialized;
bool RecordSuccess;
public:
ISel(TargetMachine &TM) : SelectionDAGISel(PPCLowering), PPCLowering(TM),
ISelDAG(0) {}
/// runOnFunction - Override this function in order to reset our per-function
/// variables.
virtual bool runOnFunction(Function &Fn) {
// Make sure we re-emit a set of the global base reg if necessary
GlobalBaseInitialized = false;
return SelectionDAGISel::runOnFunction(Fn);
}
/// InstructionSelectBasicBlock - This callback is invoked by
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG) {
DEBUG(BB->dump());
// Codegen the basic block.
ISelDAG = &DAG;
Select(DAG.getRoot());
// Clear state used for selection.
ExprMap.clear();
ISelDAG = 0;
}
// convenience functions for virtual register creation
inline unsigned MakeIntReg() {
return RegMap->createVirtualRegister(PPC::GPRCRegisterClass);
}
// dag -> dag expanders for integer divide by constant
SDOperand BuildSDIVSequence(SDOperand N);
SDOperand BuildUDIVSequence(SDOperand N);
unsigned getGlobalBaseReg();
void MoveCRtoGPR(unsigned CCReg, ISD::CondCode CC, unsigned Result);
bool SelectBitfieldInsert(SDOperand OR, unsigned Result);
unsigned FoldIfWideZeroExtend(SDOperand N);
unsigned SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC);
bool SelectIntImmediateExpr(SDOperand N, unsigned Result,
unsigned OCHi, unsigned OCLo,
bool IsArithmetic = false, bool Negate = false);
unsigned SelectExpr(SDOperand N, bool Recording=false);
void Select(SDOperand N);
unsigned SelectAddr(SDOperand N, unsigned& Reg, int& offset);
void SelectBranchCC(SDOperand N);
virtual const char *getPassName() const {
return "PowerPC Pattern Instruction Selection";
}
};
// isRunOfOnes - Returns true iff Val consists of one contiguous run of 1s with
// any number of 0s on either side. The 1s are allowed to wrap from LSB to
// MSB, so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs. 0x0F0F0000 is
// not, since all 1s are not contiguous.
static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
if (isShiftedMask_32(Val)) {
// look for the first non-zero bit
MB = CountLeadingZeros_32(Val);
// look for the first zero bit after the run of ones
ME = CountLeadingZeros_32((Val - 1) ^ Val);
return true;
} else if (isShiftedMask_32(Val = ~Val)) { // invert mask
// effectively look for the first zero bit
ME = CountLeadingZeros_32(Val) - 1;
// effectively look for the first one bit after the run of zeros
MB = CountLeadingZeros_32((Val - 1) ^ Val) + 1;
return true;
}
// no run present
return false;
}
// isRotateAndMask - Returns true if Mask and Shift can be folded in to a rotate
// and mask opcode and mask operation.
static bool isRotateAndMask(unsigned Opcode, unsigned Shift, unsigned Mask,
bool IsShiftMask,
unsigned &SH, unsigned &MB, unsigned &ME) {
if (Shift > 31) return false;
unsigned Indeterminant = ~0; // bit mask marking indeterminant results
if (Opcode == ISD::SHL) { // shift left
// apply shift to mask if it comes first
if (IsShiftMask) Mask = Mask << Shift;
// determine which bits are made indeterminant by shift
Indeterminant = ~(0xFFFFFFFFu << Shift);
} else if (Opcode == ISD::SRL) { // shift rights
// apply shift to mask if it comes first
if (IsShiftMask) Mask = Mask >> Shift;
// determine which bits are made indeterminant by shift
Indeterminant = ~(0xFFFFFFFFu >> Shift);
// adjust for the left rotate
Shift = 32 - Shift;
}
// if the mask doesn't intersect any Indeterminant bits
if (Mask && !(Mask & Indeterminant)) {
SH = Shift;
// make sure the mask is still a mask (wrap arounds may not be)
return isRunOfOnes(Mask, MB, ME);
}
// can't do it
return false;
}
// isIntImmediate - This method tests to see if a constant operand.
// If so Imm will receive the 32 bit value.
static bool isIntImmediate(SDOperand N, unsigned& Imm) {
// test for constant
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
// retrieve value
Imm = (unsigned)CN->getValue();
// passes muster
return true;
}
// not a constant
return false;
}
// isOpcWithIntImmediate - This method tests to see if the node is a specific
// opcode and that it has a immediate integer right operand.
// If so Imm will receive the 32 bit value.
static bool isOpcWithIntImmediate(SDOperand N, unsigned Opc, unsigned& Imm) {
return N.getOpcode() == Opc && isIntImmediate(N.getOperand(1), Imm);
}
// isOprShiftImm - Returns true if the specified operand is a shift opcode with
// a immediate shift count less than 32.
static bool isOprShiftImm(SDOperand N, unsigned& Opc, unsigned& SH) {
Opc = N.getOpcode();
return (Opc == ISD::SHL || Opc == ISD::SRL || Opc == ISD::SRA) &&
isIntImmediate(N.getOperand(1), SH) && SH < 32;
}
// isOprNot - Returns true if the specified operand is an xor with immediate -1.
static bool isOprNot(SDOperand N) {
unsigned Imm;
return isOpcWithIntImmediate(N, ISD::XOR, Imm) && (signed)Imm == -1;
}
// Immediate constant composers.
// Lo16 - grabs the lo 16 bits from a 32 bit constant.
// Hi16 - grabs the hi 16 bits from a 32 bit constant.
// HA16 - computes the hi bits required if the lo bits are add/subtracted in
// arithmethically.
static unsigned Lo16(unsigned x) { return x & 0x0000FFFF; }
static unsigned Hi16(unsigned x) { return Lo16(x >> 16); }
static unsigned HA16(unsigned x) { return Hi16((signed)x - (signed short)x); }
/// NodeHasRecordingVariant - If SelectExpr can always produce code for
/// NodeOpcode that also sets CR0 as a side effect, return true. Otherwise,
/// return false.
static bool NodeHasRecordingVariant(unsigned NodeOpcode) {
switch(NodeOpcode) {
default: return false;
case ISD::AND:
case ISD::OR:
return true;
}
}
/// getBCCForSetCC - Returns the PowerPC condition branch mnemonic corresponding
/// to Condition.
static unsigned getBCCForSetCC(ISD::CondCode CC) {
switch (CC) {
default: assert(0 && "Unknown condition!"); abort();
case ISD::SETEQ: return PPC::BEQ;
case ISD::SETNE: return PPC::BNE;
case ISD::SETULT:
case ISD::SETLT: return PPC::BLT;
case ISD::SETULE:
case ISD::SETLE: return PPC::BLE;
case ISD::SETUGT:
case ISD::SETGT: return PPC::BGT;
case ISD::SETUGE:
case ISD::SETGE: return PPC::BGE;
}
return 0;
}
/// getCRIdxForSetCC - Return the index of the condition register field
/// associated with the SetCC condition, and whether or not the field is
/// treated as inverted. That is, lt = 0; ge = 0 inverted.
static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool& Inv) {
switch (CC) {
default: assert(0 && "Unknown condition!"); abort();
case ISD::SETULT:
case ISD::SETLT: Inv = false; return 0;
case ISD::SETUGE:
case ISD::SETGE: Inv = true; return 0;
case ISD::SETUGT:
case ISD::SETGT: Inv = false; return 1;
case ISD::SETULE:
case ISD::SETLE: Inv = true; return 1;
case ISD::SETEQ: Inv = false; return 2;
case ISD::SETNE: Inv = true; return 2;
}
return 0;
}
/// IndexedOpForOp - Return the indexed variant for each of the PowerPC load
/// and store immediate instructions.
static unsigned IndexedOpForOp(unsigned Opcode) {
switch(Opcode) {
default: assert(0 && "Unknown opcode!"); abort();
case PPC::LBZ: return PPC::LBZX; case PPC::STB: return PPC::STBX;
case PPC::LHZ: return PPC::LHZX; case PPC::STH: return PPC::STHX;
case PPC::LHA: return PPC::LHAX; case PPC::STW: return PPC::STWX;
case PPC::LWZ: return PPC::LWZX; case PPC::STFS: return PPC::STFSX;
case PPC::LFS: return PPC::LFSX; case PPC::STFD: return PPC::STFDX;
case PPC::LFD: return PPC::LFDX;
}
return 0;
}
}
/// getGlobalBaseReg - Output the instructions required to put the
/// base address to use for accessing globals into a register.
///
unsigned ISel::getGlobalBaseReg() {
if (!GlobalBaseInitialized) {
// Insert the set of GlobalBaseReg into the first MBB of the function
MachineBasicBlock &FirstMBB = BB->getParent()->front();
MachineBasicBlock::iterator MBBI = FirstMBB.begin();
GlobalBaseReg = MakeIntReg();
BuildMI(FirstMBB, MBBI, PPC::MovePCtoLR, 0, PPC::LR);
BuildMI(FirstMBB, MBBI, PPC::MFLR, 1, GlobalBaseReg);
GlobalBaseInitialized = true;
}
return GlobalBaseReg;
}
/// MoveCRtoGPR - Move CCReg[Idx] to the least significant bit of Result. If
/// Inv is true, then invert the result.
void ISel::MoveCRtoGPR(unsigned CCReg, ISD::CondCode CC, unsigned Result){
bool Inv;
unsigned IntCR = MakeIntReg();
unsigned Idx = getCRIdxForSetCC(CC, Inv);
BuildMI(BB, PPC::MCRF, 1, PPC::CR7).addReg(CCReg);
bool GPOpt =
TLI.getTargetMachine().getSubtarget<PPCSubtarget>().isGigaProcessor();
if (GPOpt)
BuildMI(BB, PPC::MFOCRF, 1, IntCR).addReg(PPC::CR7);
else
BuildMI(BB, PPC::MFCR, 0, IntCR);
if (Inv) {
unsigned Tmp1 = MakeIntReg();
BuildMI(BB, PPC::RLWINM, 4, Tmp1).addReg(IntCR).addImm(32-(3-Idx))
.addImm(31).addImm(31);
BuildMI(BB, PPC::XORI, 2, Result).addReg(Tmp1).addImm(1);
} else {
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(IntCR).addImm(32-(3-Idx))
.addImm(31).addImm(31);
}
}
/// SelectBitfieldInsert - turn an or of two masked values into
/// the rotate left word immediate then mask insert (rlwimi) instruction.
/// Returns true on success, false if the caller still needs to select OR.
///
/// Patterns matched:
/// 1. or shl, and 5. or and, and
/// 2. or and, shl 6. or shl, shr
/// 3. or shr, and 7. or shr, shl
/// 4. or and, shr
bool ISel::SelectBitfieldInsert(SDOperand OR, unsigned Result) {
bool IsRotate = false;
unsigned TgtMask = 0xFFFFFFFF, InsMask = 0xFFFFFFFF, Amount = 0;
unsigned Value;
SDOperand Op0 = OR.getOperand(0);
SDOperand Op1 = OR.getOperand(1);
unsigned Op0Opc = Op0.getOpcode();
unsigned Op1Opc = Op1.getOpcode();
// Verify that we have the correct opcodes
if (ISD::SHL != Op0Opc && ISD::SRL != Op0Opc && ISD::AND != Op0Opc)
return false;
if (ISD::SHL != Op1Opc && ISD::SRL != Op1Opc && ISD::AND != Op1Opc)
return false;
// Generate Mask value for Target
if (isIntImmediate(Op0.getOperand(1), Value)) {
switch(Op0Opc) {
case ISD::SHL: TgtMask <<= Value; break;
case ISD::SRL: TgtMask >>= Value; break;
case ISD::AND: TgtMask &= Value; break;
}
} else {
return false;
}
// Generate Mask value for Insert
if (isIntImmediate(Op1.getOperand(1), Value)) {
switch(Op1Opc) {
case ISD::SHL:
Amount = Value;
InsMask <<= Amount;
if (Op0Opc == ISD::SRL) IsRotate = true;
break;
case ISD::SRL:
Amount = Value;
InsMask >>= Amount;
Amount = 32-Amount;
if (Op0Opc == ISD::SHL) IsRotate = true;
break;
case ISD::AND:
InsMask &= Value;
break;
}
} else {
return false;
}
unsigned Tmp3 = 0;
// If both of the inputs are ANDs and one of them has a logical shift by
// constant as its input, make that the inserted value so that we can combine
// the shift into the rotate part of the rlwimi instruction
if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) {
if (Op1.getOperand(0).getOpcode() == ISD::SHL ||
Op1.getOperand(0).getOpcode() == ISD::SRL) {
if (isIntImmediate(Op1.getOperand(0).getOperand(1), Value)) {
Amount = Op1.getOperand(0).getOpcode() == ISD::SHL ?
Value : 32 - Value;
Tmp3 = SelectExpr(Op1.getOperand(0).getOperand(0));
}
} else if (Op0.getOperand(0).getOpcode() == ISD::SHL ||
Op0.getOperand(0).getOpcode() == ISD::SRL) {
if (isIntImmediate(Op0.getOperand(0).getOperand(1), Value)) {
std::swap(Op0, Op1);
std::swap(TgtMask, InsMask);
Amount = Op1.getOperand(0).getOpcode() == ISD::SHL ?
Value : 32 - Value;
Tmp3 = SelectExpr(Op1.getOperand(0).getOperand(0));
}
}
}
// Verify that the Target mask and Insert mask together form a full word mask
// and that the Insert mask is a run of set bits (which implies both are runs
// of set bits). Given that, Select the arguments and generate the rlwimi
// instruction.
unsigned MB, ME;
if (((TgtMask & InsMask) == 0) && isRunOfOnes(InsMask, MB, ME)) {
unsigned Tmp1, Tmp2;
bool fullMask = (TgtMask ^ InsMask) == 0xFFFFFFFF;
// Check for rotlwi / rotrwi here, a special case of bitfield insert
// where both bitfield halves are sourced from the same value.
if (IsRotate && fullMask &&
OR.getOperand(0).getOperand(0) == OR.getOperand(1).getOperand(0)) {
Tmp1 = SelectExpr(OR.getOperand(0).getOperand(0));
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(Amount)
.addImm(0).addImm(31);
return true;
}
if (Op0Opc == ISD::AND && fullMask)
Tmp1 = SelectExpr(Op0.getOperand(0));
else
Tmp1 = SelectExpr(Op0);
Tmp2 = Tmp3 ? Tmp3 : SelectExpr(Op1.getOperand(0));
BuildMI(BB, PPC::RLWIMI, 5, Result).addReg(Tmp1).addReg(Tmp2)
.addImm(Amount).addImm(MB).addImm(ME);
return true;
}
return false;
}
/// FoldIfWideZeroExtend - 32 bit PowerPC implicit masks shift amounts to the
/// low six bits. If the shift amount is an ISD::AND node with a mask that is
/// wider than the implicit mask, then we can get rid of the AND and let the
/// shift do the mask.
unsigned ISel::FoldIfWideZeroExtend(SDOperand N) {
unsigned C;
if (isOpcWithIntImmediate(N, ISD::AND, C) && isMask_32(C) && C > 63)
return SelectExpr(N.getOperand(0));
else
return SelectExpr(N);
}
unsigned ISel::SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC) {
unsigned Result, Tmp1, Tmp2;
bool AlreadySelected = false;
// Allocate a condition register for this expression
Result = RegMap->createVirtualRegister(PPC::CRRCRegisterClass);
// Use U to determine whether the SETCC immediate range is signed or not.
bool U = ISD::isUnsignedIntSetCC(CC);
if (isIntImmediate(RHS, Tmp2) &&
((U && isUInt16(Tmp2)) || (!U && isInt16(Tmp2)))) {
Tmp2 = Lo16(Tmp2);
// For comparisons against zero, we can implicity set CR0 if a recording
// variant (e.g. 'or.' instead of 'or') of the instruction that defines
// operand zero of the SetCC node is available.
if (Tmp2 == 0 &&
NodeHasRecordingVariant(LHS.getOpcode()) && LHS.Val->hasOneUse()) {
RecordSuccess = false;
Tmp1 = SelectExpr(LHS, true);
if (RecordSuccess) {
++Recorded;
BuildMI(BB, PPC::MCRF, 1, Result).addReg(PPC::CR0);
return Result;
}
AlreadySelected = true;
}
// If we could not implicitly set CR0, then emit a compare immediate
// instead.
if (!AlreadySelected) Tmp1 = SelectExpr(LHS);
if (U)
BuildMI(BB, PPC::CMPLWI, 2, Result).addReg(Tmp1).addImm(Tmp2);
else
BuildMI(BB, PPC::CMPWI, 2, Result).addReg(Tmp1).addSImm(Tmp2);
} else {
unsigned CompareOpc;
if (MVT::isInteger(LHS.getValueType()))
CompareOpc = U ? PPC::CMPLW : PPC::CMPW;
else if (LHS.getValueType() == MVT::f32)
CompareOpc = PPC::FCMPUS;
else
CompareOpc = PPC::FCMPUD;
Tmp1 = SelectExpr(LHS);
Tmp2 = SelectExpr(RHS);
BuildMI(BB, CompareOpc, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
}
/// Check to see if the load is a constant offset from a base register.
unsigned ISel::SelectAddr(SDOperand N, unsigned& Reg, int& offset)
{
unsigned imm = 0, opcode = N.getOpcode();
if (N.getOpcode() == ISD::ADD) {
bool isFrame = N.getOperand(0).getOpcode() == ISD::FrameIndex;
if (isIntImmediate(N.getOperand(1), imm) && isInt16(imm)) {
offset = Lo16(imm);
if (isFrame) {
++FrameOff;
Reg = cast<FrameIndexSDNode>(N.getOperand(0))->getIndex();
return 1;
} else {
Reg = SelectExpr(N.getOperand(0));
return 0;
}
} else {
Reg = SelectExpr(N.getOperand(0));
offset = SelectExpr(N.getOperand(1));
return 2;
}
}
// Now check if we're dealing with a global, and whether or not we should emit
// an optimized load or store for statics.
if(GlobalAddressSDNode *GN = dyn_cast<GlobalAddressSDNode>(N)) {
GlobalValue *GV = GN->getGlobal();
if (!GV->hasWeakLinkage() && !GV->isExternal()) {
unsigned GlobalHi = MakeIntReg();
if (PICEnabled)
BuildMI(BB, PPC::ADDIS, 2, GlobalHi).addReg(getGlobalBaseReg())
.addGlobalAddress(GV);
else
BuildMI(BB, PPC::LIS, 1, GlobalHi).addGlobalAddress(GV);
Reg = GlobalHi;
offset = 0;
return 3;
}
}
Reg = SelectExpr(N);
offset = 0;
return 0;
}
void ISel::SelectBranchCC(SDOperand N)
{
MachineBasicBlock *Dest =
cast<BasicBlockSDNode>(N.getOperand(4))->getBasicBlock();
Select(N.getOperand(0)); //chain
ISD::CondCode CC = cast<CondCodeSDNode>(N.getOperand(1))->get();
unsigned CCReg = SelectCC(N.getOperand(2), N.getOperand(3), CC);
unsigned Opc = getBCCForSetCC(CC);
// If this is a two way branch, then grab the fallthrough basic block argument
// and build a PowerPC branch pseudo-op, suitable for long branch conversion
// if necessary by the branch selection pass. Otherwise, emit a standard
// conditional branch.
if (N.getOpcode() == ISD::BRTWOWAY_CC) {
MachineBasicBlock *Fallthrough =
cast<BasicBlockSDNode>(N.getOperand(5))->getBasicBlock();
BuildMI(BB, PPC::COND_BRANCH, 4).addReg(CCReg).addImm(Opc)
.addMBB(Dest).addMBB(Fallthrough);
BuildMI(BB, PPC::B, 1).addMBB(Fallthrough);
} else {
// Iterate to the next basic block
ilist<MachineBasicBlock>::iterator It = BB;
++It;
// If the fallthrough path is off the end of the function, which would be
// undefined behavior, set it to be the same as the current block because
// we have nothing better to set it to, and leaving it alone will cause the
// PowerPC Branch Selection pass to crash.
if (It == BB->getParent()->end()) It = Dest;
BuildMI(BB, PPC::COND_BRANCH, 4).addReg(CCReg).addImm(Opc)
.addMBB(Dest).addMBB(It);
}
return;
}
// SelectIntImmediateExpr - Choose code for opcodes with immediate value.
bool ISel::SelectIntImmediateExpr(SDOperand N, unsigned Result,
unsigned OCHi, unsigned OCLo,
bool IsArithmetic, bool Negate) {
// check constant
ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1));
// exit if not a constant
if (!CN) return false;
// extract immediate
unsigned C = (unsigned)CN->getValue();
// negate if required (ISD::SUB)
if (Negate) C = -C;
// get the hi and lo portions of constant
unsigned Hi = IsArithmetic ? HA16(C) : Hi16(C);
unsigned Lo = Lo16(C);
// assume no intermediate result from lo instruction (same as final result)
unsigned Tmp = Result;
// check if two instructions are needed
if (Hi && Lo) {
// exit if usage indicates it would be better to load immediate into a
// register
if (CN->use_size() > 2) return false;
// need intermediate result for two instructions
Tmp = MakeIntReg();
}
// get first operand
unsigned Opr0 = SelectExpr(N.getOperand(0));
// is a lo instruction needed
if (Lo) {
// generate instruction for lo portion
BuildMI(BB, OCLo, 2, Tmp).addReg(Opr0).addImm(Lo);
// need to switch out first operand for hi instruction
Opr0 = Tmp;
}
// is a hi instruction needed
if (Hi) {
// generate instruction for hi portion
BuildMI(BB, OCHi, 2, Result).addReg(Opr0).addImm(Hi);
}
return true;
}
unsigned ISel::SelectExpr(SDOperand N, bool Recording) {
unsigned Result;
unsigned Tmp1, Tmp2, Tmp3;
unsigned Opc = 0;
unsigned opcode = N.getOpcode();
SDNode *Node = N.Val;
MVT::ValueType DestType = N.getValueType();
if (Node->getOpcode() == ISD::CopyFromReg) {
unsigned Reg = cast<RegisterSDNode>(Node->getOperand(1))->getReg();
// Just use the specified register as our input.
if (MRegisterInfo::isVirtualRegister(Reg) || Reg == PPC::R1)
return Reg;
}
unsigned &Reg = ExprMap[N];
if (Reg) return Reg;
switch (N.getOpcode()) {
default:
Reg = Result = (N.getValueType() != MVT::Other) ?
MakeReg(N.getValueType()) : 1;
break;
case ISD::AssertSext:
case ISD::AssertZext:
// Don't allocate a vreg for these nodes.
return Reg = SelectExpr(N.getOperand(0));
case ISD::TAILCALL:
case ISD::CALL:
// If this is a call instruction, make sure to prepare ALL of the result
// values as well as the chain.
if (Node->getNumValues() == 1)
Reg = Result = 1; // Void call, just a chain.
else {
Result = MakeReg(Node->getValueType(0));
ExprMap[N.getValue(0)] = Result;
for (unsigned i = 1, e = N.Val->getNumValues()-1; i != e; ++i)
ExprMap[N.getValue(i)] = MakeReg(Node->getValueType(i));
ExprMap[SDOperand(Node, Node->getNumValues()-1)] = 1;
}
break;
case ISD::ADD_PARTS:
case ISD::SUB_PARTS:
Result = MakeReg(Node->getValueType(0));
ExprMap[N.getValue(0)] = Result;
for (unsigned i = 1, e = N.Val->getNumValues(); i != e; ++i)
ExprMap[N.getValue(i)] = MakeReg(Node->getValueType(i));
break;
}
switch (opcode) {
default:
Node->dump(); std::cerr << '\n';
assert(0 && "Node not handled!\n");
case PPCISD::FSEL:
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
Tmp3 = SelectExpr(N.getOperand(2));
// Extend the comparison to 64-bits if needed.
if (N.getOperand(0).getValueType() == MVT::f32) {
unsigned Tmp1New = MakeReg(MVT::f64);
BuildMI(BB, PPC::FMRSD, 1, Tmp1New).addReg(Tmp1);
Tmp1 = Tmp1New;
}
Opc = N.Val->getValueType(0) == MVT::f32 ? PPC::FSELS : PPC::FSELD;
BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
return Result;
case PPCISD::FCFID:
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::FCFID, 1, Result).addReg(Tmp1);
return Result;
case PPCISD::FCTIDZ:
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::FCTIDZ, 1, Result).addReg(Tmp1);
return Result;
case PPCISD::FCTIWZ:
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::FCTIWZ, 1, Result).addReg(Tmp1);
return Result;
case ISD::UNDEF:
if (Node->getValueType(0) == MVT::i32)
BuildMI(BB, PPC::IMPLICIT_DEF_GPR, 0, Result);
else if (Node->getValueType(0) == MVT::f32)
BuildMI(BB, PPC::IMPLICIT_DEF_F4, 0, Result);
else
BuildMI(BB, PPC::IMPLICIT_DEF_F8, 0, Result);
return Result;
case ISD::DYNAMIC_STACKALLOC:
// Generate both result values. FIXME: Need a better commment here?
if (Result != 1)
ExprMap[N.getValue(1)] = 1;
else
Result = ExprMap[N.getValue(0)] = MakeReg(N.getValue(0).getValueType());
// FIXME: We are currently ignoring the requested alignment for handling
// greater than the stack alignment. This will need to be revisited at some
// point. Align = N.getOperand(2);
if (!isa<ConstantSDNode>(N.getOperand(2)) ||
cast<ConstantSDNode>(N.getOperand(2))->getValue() != 0) {
std::cerr << "Cannot allocate stack object with greater alignment than"
<< " the stack alignment yet!";
abort();
}
Select(N.getOperand(0));
Tmp1 = SelectExpr(N.getOperand(1));
// Subtract size from stack pointer, thereby allocating some space.
BuildMI(BB, PPC::SUBF, 2, PPC::R1).addReg(Tmp1).addReg(PPC::R1);
// Put a pointer to the space into the result register by copying the SP
BuildMI(BB, PPC::OR4, 2, Result).addReg(PPC::R1).addReg(PPC::R1);
return Result;
case ISD::ConstantPool:
Tmp1 = BB->getParent()->getConstantPool()->
getConstantPoolIndex(cast<ConstantPoolSDNode>(N)->get());
Tmp2 = MakeIntReg();
if (PICEnabled)
BuildMI(BB, PPC::ADDIS, 2, Tmp2).addReg(getGlobalBaseReg())
.addConstantPoolIndex(Tmp1);
else
BuildMI(BB, PPC::LIS, 1, Tmp2).addConstantPoolIndex(Tmp1);
BuildMI(BB, PPC::LA, 2, Result).addReg(Tmp2).addConstantPoolIndex(Tmp1);
return Result;
case ISD::FrameIndex:
Tmp1 = cast<FrameIndexSDNode>(N)->getIndex();
addFrameReference(BuildMI(BB, PPC::ADDI, 2, Result), (int)Tmp1, 0, false);
return Result;
case ISD::GlobalAddress: {
GlobalValue *GV = cast<GlobalAddressSDNode>(N)->getGlobal();
Tmp1 = MakeIntReg();
if (PICEnabled)
BuildMI(BB, PPC::ADDIS, 2, Tmp1).addReg(getGlobalBaseReg())
.addGlobalAddress(GV);
else
BuildMI(BB, PPC::LIS, 1, Tmp1).addGlobalAddress(GV);
if (GV->hasWeakLinkage() || GV->isExternal()) {
BuildMI(BB, PPC::LWZ, 2, Result).addGlobalAddress(GV).addReg(Tmp1);
} else {
BuildMI(BB, PPC::LA, 2, Result).addReg(Tmp1).addGlobalAddress(GV);
}
return Result;
}
case ISD::LOAD:
case ISD::EXTLOAD:
case ISD::ZEXTLOAD:
case ISD::SEXTLOAD: {
MVT::ValueType TypeBeingLoaded = (ISD::LOAD == opcode) ?
Node->getValueType(0) : cast<VTSDNode>(Node->getOperand(3))->getVT();
bool sext = (ISD::SEXTLOAD == opcode);
// Make sure we generate both values.
if (Result != 1)
ExprMap[N.getValue(1)] = 1; // Generate the token
else
Result = ExprMap[N.getValue(0)] = MakeReg(N.getValue(0).getValueType());
SDOperand Chain = N.getOperand(0);
SDOperand Address = N.getOperand(1);
Select(Chain);
switch (TypeBeingLoaded) {
default: Node->dump(); assert(0 && "Cannot load this type!");
case MVT::i1: Opc = PPC::LBZ; break;
case MVT::i8: Opc = PPC::LBZ; break;
case MVT::i16: Opc = sext ? PPC::LHA : PPC::LHZ; break;
case MVT::i32: Opc = PPC::LWZ; break;
case MVT::f32: Opc = PPC::LFS; break;
case MVT::f64: Opc = PPC::LFD; break;
}
if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Address)) {
Tmp1 = MakeIntReg();
unsigned CPI = BB->getParent()->getConstantPool()->
getConstantPoolIndex(CP->get());
if (PICEnabled)
BuildMI(BB, PPC::ADDIS, 2, Tmp1).addReg(getGlobalBaseReg())
.addConstantPoolIndex(CPI);
else
BuildMI(BB, PPC::LIS, 1, Tmp1).addConstantPoolIndex(CPI);
BuildMI(BB, Opc, 2, Result).addConstantPoolIndex(CPI).addReg(Tmp1);
} else if (Address.getOpcode() == ISD::FrameIndex) {
Tmp1 = cast<FrameIndexSDNode>(Address)->getIndex();
addFrameReference(BuildMI(BB, Opc, 2, Result), (int)Tmp1);
} else {
int offset;
switch(SelectAddr(Address, Tmp1, offset)) {
default: assert(0 && "Unhandled return value from SelectAddr");
case 0: // imm offset, no frame, no index
BuildMI(BB, Opc, 2, Result).addSImm(offset).addReg(Tmp1);
break;
case 1: // imm offset + frame index
addFrameReference(BuildMI(BB, Opc, 2, Result), (int)Tmp1, offset);
break;
case 2: // base+index addressing
Opc = IndexedOpForOp(Opc);
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(offset);
break;
case 3: {
GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(Address);
GlobalValue *GV = GN->getGlobal();
BuildMI(BB, Opc, 2, Result).addGlobalAddress(GV).addReg(Tmp1);
}
}
}
return Result;
}
case ISD::TAILCALL:
case ISD::CALL: {
unsigned GPR_idx = 0, FPR_idx = 0;
static const unsigned GPR[] = {
PPC::R3, PPC::R4, PPC::R5, PPC::R6,
PPC::R7, PPC::R8, PPC::R9, PPC::R10,
};
static const unsigned FPR[] = {
PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
};
// Lower the chain for this call.
Select(N.getOperand(0));
ExprMap[N.getValue(Node->getNumValues()-1)] = 1;
MachineInstr *CallMI;
// Emit the correct call instruction based on the type of symbol called.
if (GlobalAddressSDNode *GASD =
dyn_cast<GlobalAddressSDNode>(N.getOperand(1))) {
CallMI = BuildMI(PPC::CALLpcrel, 1).addGlobalAddress(GASD->getGlobal(),
true);
} else if (ExternalSymbolSDNode *ESSDN =
dyn_cast<ExternalSymbolSDNode>(N.getOperand(1))) {
CallMI = BuildMI(PPC::CALLpcrel, 1).addExternalSymbol(ESSDN->getSymbol(),
true);
} else {
Tmp1 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::MTCTR, 1).addReg(Tmp1);
BuildMI(BB, PPC::OR4, 2, PPC::R12).addReg(Tmp1).addReg(Tmp1);
CallMI = BuildMI(PPC::CALLindirect, 3).addImm(20).addImm(0)
.addReg(PPC::R12);
}
// Load the register args to virtual regs
std::vector<unsigned> ArgVR;
for(int i = 2, e = Node->getNumOperands(); i < e; ++i)
ArgVR.push_back(SelectExpr(N.getOperand(i)));
// Copy the virtual registers into the appropriate argument register
for(int i = 0, e = ArgVR.size(); i < e; ++i) {
switch(N.getOperand(i+2).getValueType()) {
default: Node->dump(); assert(0 && "Unknown value type for call");
case MVT::i32:
assert(GPR_idx < 8 && "Too many int args");
if (N.getOperand(i+2).getOpcode() != ISD::UNDEF) {
BuildMI(BB, PPC::OR4,2,GPR[GPR_idx]).addReg(ArgVR[i]).addReg(ArgVR[i]);
CallMI->addRegOperand(GPR[GPR_idx], MachineOperand::Use);
}
++GPR_idx;
break;
case MVT::f64:
case MVT::f32:
assert(FPR_idx < 13 && "Too many fp args");
BuildMI(BB, N.getOperand(i+2).getValueType() == MVT::f32 ? PPC::FMRS :
PPC::FMRD, 1, FPR[FPR_idx]).addReg(ArgVR[i]);
CallMI->addRegOperand(FPR[FPR_idx], MachineOperand::Use);
++FPR_idx;
break;
}
}
// Put the call instruction in the correct place in the MachineBasicBlock
BB->push_back(CallMI);
switch (Node->getValueType(0)) {
default: assert(0 && "Unknown value type for call result!");
case MVT::Other: return 1;
case MVT::i32:
if (Node->getValueType(1) == MVT::i32) {
BuildMI(BB, PPC::OR4, 2, Result+1).addReg(PPC::R3).addReg(PPC::R3);
BuildMI(BB, PPC::OR4, 2, Result).addReg(PPC::R4).addReg(PPC::R4);
} else {
BuildMI(BB, PPC::OR4, 2, Result).addReg(PPC::R3).addReg(PPC::R3);
}
break;
case MVT::f32:
BuildMI(BB, PPC::FMRS, 1, Result).addReg(PPC::F1);
break;
case MVT::f64:
BuildMI(BB, PPC::FMRD, 1, Result).addReg(PPC::F1);
break;
}
return Result+N.ResNo;
}
case ISD::SIGN_EXTEND_INREG:
Tmp1 = SelectExpr(N.getOperand(0));
switch(cast<VTSDNode>(Node->getOperand(1))->getVT()) {
default: Node->dump(); assert(0 && "Unhandled SIGN_EXTEND type"); break;
case MVT::i16:
BuildMI(BB, PPC::EXTSH, 1, Result).addReg(Tmp1);
break;
case MVT::i8:
BuildMI(BB, PPC::EXTSB, 1, Result).addReg(Tmp1);
break;
}
return Result;
case ISD::CopyFromReg:
DestType = N.getValue(0).getValueType();
if (Result == 1)
Result = ExprMap[N.getValue(0)] = MakeReg(DestType);
else
ExprMap[N.getValue(1)] = 1;
Tmp1 = dyn_cast<RegisterSDNode>(Node->getOperand(1))->getReg();
if (MVT::isInteger(DestType))
BuildMI(BB, PPC::OR4, 2, Result).addReg(Tmp1).addReg(Tmp1);
else if (DestType == MVT::f32)
BuildMI(BB, PPC::FMRS, 1, Result).addReg(Tmp1);
else
BuildMI(BB, PPC::FMRD, 1, Result).addReg(Tmp1);
return Result;
case ISD::SHL:
if (isIntImmediate(N.getOperand(1), Tmp2)) {
unsigned SH, MB, ME;
if (isOpcWithIntImmediate(N.getOperand(0), ISD::AND, Tmp3) &&
isRotateAndMask(ISD::SHL, Tmp2, Tmp3, true, SH, MB, ME)) {
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(SH)
.addImm(MB).addImm(ME);
return Result;
}
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 &= 0x1F;
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(Tmp2).addImm(0)
.addImm(31-Tmp2);
} else {
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = FoldIfWideZeroExtend(N.getOperand(1));
BuildMI(BB, PPC::SLW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::SRL:
if (isIntImmediate(N.getOperand(1), Tmp2)) {
unsigned SH, MB, ME;
if (isOpcWithIntImmediate(N.getOperand(0), ISD::AND, Tmp3) &&
isRotateAndMask(ISD::SRL, Tmp2, Tmp3, true, SH, MB, ME)) {
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(SH & 0x1F)
.addImm(MB).addImm(ME);
return Result;
}
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 &= 0x1F;
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm((32-Tmp2) & 0x1F)
.addImm(Tmp2).addImm(31);
} else {
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = FoldIfWideZeroExtend(N.getOperand(1));
BuildMI(BB, PPC::SRW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::SRA:
if (isIntImmediate(N.getOperand(1), Tmp2)) {
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::SRAWI, 2, Result).addReg(Tmp1).addImm(Tmp2 & 0x1F);
} else {
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = FoldIfWideZeroExtend(N.getOperand(1));
BuildMI(BB, PPC::SRAW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::CTLZ:
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::CNTLZW, 1, Result).addReg(Tmp1);
return Result;
case ISD::ADD:
if (SelectIntImmediateExpr(N, Result, PPC::ADDIS, PPC::ADDI, true))
return Result;
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::ADD4, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::FADD:
if (!NoExcessFPPrecision && N.getOperand(0).getOpcode() == ISD::FMUL &&
N.getOperand(0).Val->hasOneUse()) {
++FusedFP; // Statistic
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
Tmp3 = SelectExpr(N.getOperand(1));
Opc = DestType == MVT::f64 ? PPC::FMADD : PPC::FMADDS;
BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
return Result;
}
if (!NoExcessFPPrecision && N.getOperand(1).getOpcode() == ISD::FMUL &&
N.getOperand(1).Val->hasOneUse()) {
++FusedFP; // Statistic
Tmp1 = SelectExpr(N.getOperand(1).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1).getOperand(1));
Tmp3 = SelectExpr(N.getOperand(0));
Opc = DestType == MVT::f64 ? PPC::FMADD : PPC::FMADDS;
BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
return Result;
}
Opc = DestType == MVT::f64 ? PPC::FADD : PPC::FADDS;
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::AND:
if (isIntImmediate(N.getOperand(1), Tmp2)) {
if (isShiftedMask_32(Tmp2) || isShiftedMask_32(~Tmp2)) {
unsigned SH, MB, ME;
Opc = Recording ? PPC::RLWINMo : PPC::RLWINM;
unsigned OprOpc;
if (isOprShiftImm(N.getOperand(0), OprOpc, Tmp3) &&
isRotateAndMask(OprOpc, Tmp3, Tmp2, false, SH, MB, ME)) {
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
} else {
Tmp1 = SelectExpr(N.getOperand(0));
isRunOfOnes(Tmp2, MB, ME);
SH = 0;
}
BuildMI(BB, Opc, 4, Result).addReg(Tmp1).addImm(SH)
.addImm(MB).addImm(ME);
RecordSuccess = true;
return Result;
} else if (isUInt16(Tmp2)) {
Tmp2 = Lo16(Tmp2);
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::ANDIo, 2, Result).addReg(Tmp1).addImm(Tmp2);
RecordSuccess = true;
return Result;
} else if (isUInt16(Tmp2)) {
Tmp2 = Hi16(Tmp2);
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::ANDISo, 2, Result).addReg(Tmp1).addImm(Tmp2);
RecordSuccess = true;
return Result;
}
}
if (isOprNot(N.getOperand(1))) {
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1).getOperand(0));
BuildMI(BB, PPC::ANDC, 2, Result).addReg(Tmp1).addReg(Tmp2);
RecordSuccess = false;
return Result;
}
if (isOprNot(N.getOperand(0))) {
Tmp1 = SelectExpr(N.getOperand(1));
Tmp2 = SelectExpr(N.getOperand(0).getOperand(0));
BuildMI(BB, PPC::ANDC, 2, Result).addReg(Tmp1).addReg(Tmp2);
RecordSuccess = false;
return Result;
}
// emit a regular and
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
Opc = Recording ? PPC::ANDo : PPC::AND;
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
RecordSuccess = true;
return Result;
case ISD::OR:
if (SelectBitfieldInsert(N, Result))
return Result;
if (SelectIntImmediateExpr(N, Result, PPC::ORIS, PPC::ORI))
return Result;
if (isOprNot(N.getOperand(1))) {
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1).getOperand(0));
BuildMI(BB, PPC::ORC, 2, Result).addReg(Tmp1).addReg(Tmp2);
RecordSuccess = false;
return Result;
}
if (isOprNot(N.getOperand(0))) {
Tmp1 = SelectExpr(N.getOperand(1));
Tmp2 = SelectExpr(N.getOperand(0).getOperand(0));
BuildMI(BB, PPC::ORC, 2, Result).addReg(Tmp1).addReg(Tmp2);
RecordSuccess = false;
return Result;
}
// emit regular or
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
Opc = Recording ? PPC::ORo : PPC::OR4;
RecordSuccess = true;
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::XOR: {
// Check for EQV: xor, (xor a, -1), b
if (isOprNot(N.getOperand(0))) {
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::EQV, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
}
// Check for NOT, NOR, EQV, and NAND: xor (copy, or, xor, and), -1
if (isOprNot(N)) {
switch(N.getOperand(0).getOpcode()) {
case ISD::OR:
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
BuildMI(BB, PPC::NOR, 2, Result).addReg(Tmp1).addReg(Tmp2);
break;
case ISD::AND:
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
BuildMI(BB, PPC::NAND, 2, Result).addReg(Tmp1).addReg(Tmp2);
break;
case ISD::XOR:
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
BuildMI(BB, PPC::EQV, 2, Result).addReg(Tmp1).addReg(Tmp2);
break;
default:
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::NOR, 2, Result).addReg(Tmp1).addReg(Tmp1);
break;
}
return Result;
}
if (SelectIntImmediateExpr(N, Result, PPC::XORIS, PPC::XORI))
return Result;
// emit regular xor
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::XOR, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
}
case ISD::FSUB:
if (!NoExcessFPPrecision && N.getOperand(0).getOpcode() == ISD::FMUL &&
N.getOperand(0).Val->hasOneUse()) {
++FusedFP; // Statistic
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(0).getOperand(1));
Tmp3 = SelectExpr(N.getOperand(1));
Opc = DestType == MVT::f64 ? PPC::FMSUB : PPC::FMSUBS;
BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
return Result;
}
if (!NoExcessFPPrecision && N.getOperand(1).getOpcode() == ISD::FMUL &&
N.getOperand(1).Val->hasOneUse()) {
++FusedFP; // Statistic
Tmp1 = SelectExpr(N.getOperand(1).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1).getOperand(1));
Tmp3 = SelectExpr(N.getOperand(0));
Opc = DestType == MVT::f64 ? PPC::FNMSUB : PPC::FNMSUBS;
BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
return Result;
}
Opc = DestType == MVT::f64 ? PPC::FSUB : PPC::FSUBS;
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::SUB:
if (isIntImmediate(N.getOperand(0), Tmp1) && isInt16(Tmp1)) {
Tmp1 = Lo16(Tmp1);
Tmp2 = SelectExpr(N.getOperand(1));
if (0 == Tmp1)
BuildMI(BB, PPC::NEG, 1, Result).addReg(Tmp2);
else
BuildMI(BB, PPC::SUBFIC, 2, Result).addReg(Tmp2).addSImm(Tmp1);
return Result;
}
if (SelectIntImmediateExpr(N, Result, PPC::ADDIS, PPC::ADDI, true, true))
return Result;
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::SUBF, 2, Result).addReg(Tmp2).addReg(Tmp1);
return Result;
case ISD::FMUL:
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, DestType == MVT::f32 ? PPC::FMULS : PPC::FMUL, 2,
Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::MUL:
Tmp1 = SelectExpr(N.getOperand(0));
if (isIntImmediate(N.getOperand(1), Tmp2) && isInt16(Tmp2)) {
Tmp2 = Lo16(Tmp2);
BuildMI(BB, PPC::MULLI, 2, Result).addReg(Tmp1).addSImm(Tmp2);
} else {
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::MULLW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::MULHS:
case ISD::MULHU:
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
Opc = (ISD::MULHU == opcode) ? PPC::MULHWU : PPC::MULHW;
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::FDIV:
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
switch (DestType) {
default: assert(0 && "Unknown type to ISD::FDIV"); break;
case MVT::f32: Opc = PPC::FDIVS; break;
case MVT::f64: Opc = PPC::FDIV; break;
}
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::SDIV:
if (isIntImmediate(N.getOperand(1), Tmp3)) {
if ((signed)Tmp3 > 0 && isPowerOf2_32(Tmp3)) {
Tmp3 = Log2_32(Tmp3);
Tmp1 = MakeIntReg();
Tmp2 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::SRAWI, 2, Tmp1).addReg(Tmp2).addImm(Tmp3);
BuildMI(BB, PPC::ADDZE, 1, Result).addReg(Tmp1);
return Result;
} else if ((signed)Tmp3 < 0 && isPowerOf2_32(-Tmp3)) {
Tmp3 = Log2_32(-Tmp3);
Tmp2 = SelectExpr(N.getOperand(0));
Tmp1 = MakeIntReg();
unsigned Tmp4 = MakeIntReg();
BuildMI(BB, PPC::SRAWI, 2, Tmp1).addReg(Tmp2).addImm(Tmp3);
BuildMI(BB, PPC::ADDZE, 1, Tmp4).addReg(Tmp1);
BuildMI(BB, PPC::NEG, 1, Result).addReg(Tmp4);
return Result;
}
}
// fall thru
case ISD::UDIV:
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
Opc = (ISD::UDIV == opcode) ? PPC::DIVWU : PPC::DIVW; break;
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::ADD_PARTS:
case ISD::SUB_PARTS: {
assert(N.getNumOperands() == 4 && N.getValueType() == MVT::i32 &&
"Not an i64 add/sub!");
unsigned Tmp4 = 0;
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
if (N.getOpcode() == ISD::ADD_PARTS) {
bool ME = false, ZE = false;
if (isIntImmediate(N.getOperand(3), Tmp3)) {
ME = (signed)Tmp3 == -1;
ZE = Tmp3 == 0;
}
if (!ZE && !ME)
Tmp4 = SelectExpr(N.getOperand(3));
if (isIntImmediate(N.getOperand(2), Tmp3) &&
((signed)Tmp3 >= -32768 || (signed)Tmp3 < 32768)) {
// Codegen the low 32 bits of the add. Interestingly, there is no
// shifted form of add immediate carrying.
BuildMI(BB, PPC::ADDIC, 2, Result).addReg(Tmp1).addSImm(Tmp3);
} else {
Tmp3 = SelectExpr(N.getOperand(2));
BuildMI(BB, PPC::ADDC, 2, Result).addReg(Tmp1).addReg(Tmp3);
}
// Codegen the high 32 bits, adding zero, minus one, or the full value
// along with the carry flag produced by addc/addic to tmp2.
if (ZE) {
BuildMI(BB, PPC::ADDZE, 1, Result+1).addReg(Tmp2);
} else if (ME) {
BuildMI(BB, PPC::ADDME, 1, Result+1).addReg(Tmp2);
} else {
BuildMI(BB, PPC::ADDE, 2, Result+1).addReg(Tmp2).addReg(Tmp4);
}
} else {
Tmp3 = SelectExpr(N.getOperand(2));
Tmp4 = SelectExpr(N.getOperand(3));
BuildMI(BB, PPC::SUBFC, 2, Result).addReg(Tmp3).addReg(Tmp1);
BuildMI(BB, PPC::SUBFE, 2, Result+1).addReg(Tmp4).addReg(Tmp2);
}
return Result+N.ResNo;
}
case ISD::SETCC: {
ISD::CondCode CC = cast<CondCodeSDNode>(Node->getOperand(2))->get();
if (isIntImmediate(Node->getOperand(1), Tmp3)) {
// We can codegen setcc op, imm very efficiently compared to a brcond.
// Check for those cases here.
// setcc op, 0
if (Tmp3 == 0) {
Tmp1 = SelectExpr(Node->getOperand(0));
switch (CC) {
default: Node->dump(); assert(0 && "Unhandled SetCC condition");abort();
case ISD::SETEQ:
Tmp2 = MakeIntReg();
BuildMI(BB, PPC::CNTLZW, 1, Tmp2).addReg(Tmp1);
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp2).addImm(27)
.addImm(5).addImm(31);
break;
case ISD::SETNE:
Tmp2 = MakeIntReg();
BuildMI(BB, PPC::ADDIC, 2, Tmp2).addReg(Tmp1).addSImm(-1);
BuildMI(BB, PPC::SUBFE, 2, Result).addReg(Tmp2).addReg(Tmp1);
break;
case ISD::SETLT:
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp1).addImm(1)
.addImm(31).addImm(31);
break;
case ISD::SETGT:
Tmp2 = MakeIntReg();
Tmp3 = MakeIntReg();
BuildMI(BB, PPC::NEG, 2, Tmp2).addReg(Tmp1);
BuildMI(BB, PPC::ANDC, 2, Tmp3).addReg(Tmp2).addReg(Tmp1);
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp3).addImm(1)
.addImm(31).addImm(31);
break;
}
return Result;
} else if (Tmp3 == ~0U) { // setcc op, -1
Tmp1 = SelectExpr(Node->getOperand(0));
switch (CC) {
default: assert(0 && "Unhandled SetCC condition"); abort();
case ISD::SETEQ:
Tmp2 = MakeIntReg();
Tmp3 = MakeIntReg();
BuildMI(BB, PPC::ADDIC, 2, Tmp2).addReg(Tmp1).addSImm(1);
BuildMI(BB, PPC::LI, 1, Tmp3).addSImm(0);
BuildMI(BB, PPC::ADDZE, 1, Result).addReg(Tmp3);
break;
case ISD::SETNE:
Tmp2 = MakeIntReg();
Tmp3 = MakeIntReg();
BuildMI(BB, PPC::NOR, 2, Tmp2).addReg(Tmp1).addReg(Tmp1);
BuildMI(BB, PPC::ADDIC, 2, Tmp3).addReg(Tmp2).addSImm(-1);
BuildMI(BB, PPC::SUBFE, 2, Result).addReg(Tmp3).addReg(Tmp2);
break;
case ISD::SETLT:
Tmp2 = MakeIntReg();
Tmp3 = MakeIntReg();
BuildMI(BB, PPC::ADDI, 2, Tmp2).addReg(Tmp1).addSImm(1);
BuildMI(BB, PPC::AND, 2, Tmp3).addReg(Tmp2).addReg(Tmp1);
BuildMI(BB, PPC::RLWINM, 4, Result).addReg(Tmp3).addImm(1)
.addImm(31).addImm(31);
break;
case ISD::SETGT:
Tmp2 = MakeIntReg();
BuildMI(BB, PPC::RLWINM, 4, Tmp2).addReg(Tmp1).addImm(1)
.addImm(31).addImm(31);
BuildMI(BB, PPC::XORI, 2, Result).addReg(Tmp2).addImm(1);
break;
}
return Result;
}
}
unsigned CCReg = SelectCC(N.getOperand(0), N.getOperand(1), CC);
MoveCRtoGPR(CCReg, CC, Result);
return Result;
}
case ISD::SELECT_CC: {
ISD::CondCode CC = cast<CondCodeSDNode>(N.getOperand(4))->get();
// handle the setcc cases here. select_cc lhs, 0, 1, 0, cc
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N.getOperand(1));
ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N.getOperand(2));
ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N.getOperand(3));
if (N1C && N2C && N3C && N1C->isNullValue() && N3C->isNullValue() &&
N2C->getValue() == 1ULL && CC == ISD::SETNE) {
Tmp1 = SelectExpr(Node->getOperand(0));
Tmp2 = MakeIntReg();
BuildMI(BB, PPC::ADDIC, 2, Tmp2).addReg(Tmp1).addSImm(-1);
BuildMI(BB, PPC::SUBFE, 2, Result).addReg(Tmp2).addReg(Tmp1);
return Result;
}
// If the False value only has one use, we can generate better code by
// selecting it in the fallthrough basic block rather than here, which
// increases register pressure.
unsigned TrueValue = SelectExpr(N.getOperand(2));
unsigned FalseValue;
// If the false value is simple enough, evaluate it inline in the false
// block.
if (N.getOperand(3).Val->hasOneUse() &&
(isa<ConstantSDNode>(N.getOperand(3)) ||
isa<GlobalAddressSDNode>(N.getOperand(3))))
FalseValue = 0;
else
FalseValue = SelectExpr(N.getOperand(3));
unsigned CCReg = SelectCC(N.getOperand(0), N.getOperand(1), CC);
Opc = getBCCForSetCC(CC);
// Create an iterator with which to insert the MBB for copying the false
// value and the MBB to hold the PHI instruction for this SetCC.
MachineBasicBlock *thisMBB = BB;
const BasicBlock *LLVM_BB = BB->getBasicBlock();
ilist<MachineBasicBlock>::iterator It = BB;
++It;
// thisMBB:
// ...
// TrueVal = ...
// cmpTY ccX, r1, r2
// bCC copy1MBB
// fallthrough --> copy0MBB
MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
BuildMI(BB, Opc, 2).addReg(CCReg).addMBB(sinkMBB);
MachineFunction *F = BB->getParent();
F->getBasicBlockList().insert(It, copy0MBB);
F->getBasicBlockList().insert(It, sinkMBB);
// Update machine-CFG edges
BB->addSuccessor(copy0MBB);
BB->addSuccessor(sinkMBB);
// copy0MBB:
// %FalseValue = ...
// # fallthrough to sinkMBB
BB = copy0MBB;
// If the false value is simple enough, evaluate it here, to avoid it being
// evaluated on the true edge.
if (FalseValue == 0)
FalseValue = SelectExpr(N.getOperand(3));
// Update machine-CFG edges
BB->addSuccessor(sinkMBB);
// sinkMBB:
// %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
// ...
BB = sinkMBB;
BuildMI(BB, PPC::PHI, 4, Result).addReg(FalseValue)
.addMBB(copy0MBB).addReg(TrueValue).addMBB(thisMBB);
return Result;
}
case ISD::Constant: {
assert(N.getValueType() == MVT::i32 &&
"Only i32 constants are legal on this target!");
unsigned v = (unsigned)cast<ConstantSDNode>(N)->getValue();
if (isInt16(v)) {
BuildMI(BB, PPC::LI, 1, Result).addSImm(Lo16(v));
} else {
unsigned Hi = Hi16(v);
unsigned Lo = Lo16(v);
if (Lo) {
Tmp1 = MakeIntReg();
BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(Hi);
BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(Lo);
} else {
BuildMI(BB, PPC::LIS, 1, Result).addSImm(Hi);
}
}
return Result;
}
case ISD::FNEG:
if (!NoExcessFPPrecision &&
ISD::FADD == N.getOperand(0).getOpcode() &&
N.getOperand(0).Val->hasOneUse() &&
ISD::FMUL == N.getOperand(0).getOperand(0).getOpcode() &&
N.getOperand(0).getOperand(0).Val->hasOneUse()) {
++FusedFP; // Statistic
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(0).getOperand(0).getOperand(1));
Tmp3 = SelectExpr(N.getOperand(0).getOperand(1));
Opc = DestType == MVT::f64 ? PPC::FNMADD : PPC::FNMADDS;
BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
} else if (!NoExcessFPPrecision &&
ISD::FADD == N.getOperand(0).getOpcode() &&
N.getOperand(0).Val->hasOneUse() &&
ISD::FMUL == N.getOperand(0).getOperand(1).getOpcode() &&
N.getOperand(0).getOperand(1).Val->hasOneUse()) {
++FusedFP; // Statistic
Tmp1 = SelectExpr(N.getOperand(0).getOperand(1).getOperand(0));
Tmp2 = SelectExpr(N.getOperand(0).getOperand(1).getOperand(1));
Tmp3 = SelectExpr(N.getOperand(0).getOperand(0));
Opc = DestType == MVT::f64 ? PPC::FNMADD : PPC::FNMADDS;
BuildMI(BB, Opc, 3, Result).addReg(Tmp1).addReg(Tmp2).addReg(Tmp3);
} else if (ISD::FABS == N.getOperand(0).getOpcode()) {
Tmp1 = SelectExpr(N.getOperand(0).getOperand(0));
if (N.getOperand(0).getValueType() == MVT::f32)
BuildMI(BB, PPC::FNABSS, 1, Result).addReg(Tmp1);
else
BuildMI(BB, PPC::FNABSD, 1, Result).addReg(Tmp1);
} else {
Tmp1 = SelectExpr(N.getOperand(0));
if (N.getOperand(0).getValueType() == MVT::f32)
BuildMI(BB, PPC::FNEGS, 1, Result).addReg(Tmp1);
else
BuildMI(BB, PPC::FNEGD, 1, Result).addReg(Tmp1);
}
return Result;
case ISD::FABS:
Tmp1 = SelectExpr(N.getOperand(0));
if (N.getOperand(0).getValueType() == MVT::f32)
BuildMI(BB, PPC::FABSS, 1, Result).addReg(Tmp1);
else
BuildMI(BB, PPC::FABSD, 1, Result).addReg(Tmp1);
return Result;
case ISD::FSQRT:
Tmp1 = SelectExpr(N.getOperand(0));
Opc = DestType == MVT::f64 ? PPC::FSQRT : PPC::FSQRTS;
BuildMI(BB, Opc, 1, Result).addReg(Tmp1);
return Result;
case ISD::FP_ROUND:
assert (DestType == MVT::f32 &&
N.getOperand(0).getValueType() == MVT::f64 &&
"only f64 to f32 conversion supported here");
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::FRSP, 1, Result).addReg(Tmp1);
return Result;
case ISD::FP_EXTEND:
assert (DestType == MVT::f64 &&
N.getOperand(0).getValueType() == MVT::f32 &&
"only f32 to f64 conversion supported here");
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::FMRSD, 1, Result).addReg(Tmp1);
return Result;
}
return 0;
}
void ISel::Select(SDOperand N) {
unsigned Tmp1, Tmp2, Tmp3, Opc;
unsigned opcode = N.getOpcode();
if (!ExprMap.insert(std::make_pair(N, 1)).second)
return; // Already selected.
SDNode *Node = N.Val;
switch (Node->getOpcode()) {
default:
Node->dump(); std::cerr << "\n";
assert(0 && "Node not handled yet!");
case ISD::EntryToken: return; // Noop
case ISD::TokenFactor:
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
Select(Node->getOperand(i));
return;
case ISD::CALLSEQ_START:
case ISD::CALLSEQ_END:
Select(N.getOperand(0));
Tmp1 = cast<ConstantSDNode>(N.getOperand(1))->getValue();
Opc = N.getOpcode() == ISD::CALLSEQ_START ? PPC::ADJCALLSTACKDOWN :
PPC::ADJCALLSTACKUP;
BuildMI(BB, Opc, 1).addImm(Tmp1);
return;
case ISD::BR: {
MachineBasicBlock *Dest =
cast<BasicBlockSDNode>(N.getOperand(1))->getBasicBlock();
Select(N.getOperand(0));
BuildMI(BB, PPC::B, 1).addMBB(Dest);
return;
}
case ISD::BR_CC:
case ISD::BRTWOWAY_CC:
SelectBranchCC(N);
return;
case ISD::CopyToReg:
Select(N.getOperand(0));
Tmp1 = SelectExpr(N.getOperand(2));
Tmp2 = cast<RegisterSDNode>(N.getOperand(1))->getReg();
if (Tmp1 != Tmp2) {
if (N.getOperand(2).getValueType() == MVT::f64)
BuildMI(BB, PPC::FMRD, 1, Tmp2).addReg(Tmp1);
else if (N.getOperand(2).getValueType() == MVT::f32)
BuildMI(BB, PPC::FMRS, 1, Tmp2).addReg(Tmp1);
else
BuildMI(BB, PPC::OR4, 2, Tmp2).addReg(Tmp1).addReg(Tmp1);
}
return;
case ISD::ImplicitDef:
Select(N.getOperand(0));
Tmp1 = cast<RegisterSDNode>(N.getOperand(1))->getReg();
if (N.getOperand(1).getValueType() == MVT::i32)
BuildMI(BB, PPC::IMPLICIT_DEF_GPR, 0, Tmp1);
else if (N.getOperand(1).getValueType() == MVT::f32)
BuildMI(BB, PPC::IMPLICIT_DEF_F4, 0, Tmp1);
else
BuildMI(BB, PPC::IMPLICIT_DEF_F8, 0, Tmp1);
return;
case ISD::RET:
switch (N.getNumOperands()) {
default:
assert(0 && "Unknown return instruction!");
case 3:
assert(N.getOperand(1).getValueType() == MVT::i32 &&
N.getOperand(2).getValueType() == MVT::i32 &&
"Unknown two-register value!");
Select(N.getOperand(0));
Tmp1 = SelectExpr(N.getOperand(1));
Tmp2 = SelectExpr(N.getOperand(2));
BuildMI(BB, PPC::OR4, 2, PPC::R3).addReg(Tmp2).addReg(Tmp2);
BuildMI(BB, PPC::OR4, 2, PPC::R4).addReg(Tmp1).addReg(Tmp1);
break;
case 2:
Select(N.getOperand(0));
Tmp1 = SelectExpr(N.getOperand(1));
switch (N.getOperand(1).getValueType()) {
default:
assert(0 && "Unknown return type!");
case MVT::f64:
BuildMI(BB, PPC::FMRD, 1, PPC::F1).addReg(Tmp1);
break;
case MVT::f32:
BuildMI(BB, PPC::FMRS, 1, PPC::F1).addReg(Tmp1);
break;
case MVT::i32:
BuildMI(BB, PPC::OR4, 2, PPC::R3).addReg(Tmp1).addReg(Tmp1);
break;
}
case 1:
Select(N.getOperand(0));
break;
}
BuildMI(BB, PPC::BLR, 0); // Just emit a 'ret' instruction
return;
case ISD::TRUNCSTORE:
case ISD::STORE: {
SDOperand Chain = N.getOperand(0);
SDOperand Value = N.getOperand(1);
SDOperand Address = N.getOperand(2);
Select(Chain);
Tmp1 = SelectExpr(Value); //value
if (opcode == ISD::STORE) {
switch(Value.getValueType()) {
default: assert(0 && "unknown Type in store");
case MVT::i32: Opc = PPC::STW; break;
case MVT::f64: Opc = PPC::STFD; break;
case MVT::f32: Opc = PPC::STFS; break;
}
} else { //ISD::TRUNCSTORE
switch(cast<VTSDNode>(Node->getOperand(4))->getVT()) {
default: assert(0 && "unknown Type in store");
case MVT::i8: Opc = PPC::STB; break;
case MVT::i16: Opc = PPC::STH; break;
}
}
if(Address.getOpcode() == ISD::FrameIndex) {
Tmp2 = cast<FrameIndexSDNode>(Address)->getIndex();
addFrameReference(BuildMI(BB, Opc, 3).addReg(Tmp1), (int)Tmp2);
} else {
int offset;
switch(SelectAddr(Address, Tmp2, offset)) {
default: assert(0 && "Unhandled return value from SelectAddr");
case 0: // imm offset, no frame, no index
BuildMI(BB, Opc, 3).addReg(Tmp1).addSImm(offset).addReg(Tmp2);
break;
case 1: // imm offset + frame index
addFrameReference(BuildMI(BB, Opc, 3).addReg(Tmp1), (int)Tmp2, offset);
break;
case 2: // base+index addressing
Opc = IndexedOpForOp(Opc);
BuildMI(BB, Opc, 3).addReg(Tmp1).addReg(Tmp2).addReg(offset);
break;
case 3: {
GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(Address);
GlobalValue *GV = GN->getGlobal();
BuildMI(BB, Opc, 3).addReg(Tmp1).addGlobalAddress(GV).addReg(Tmp2);
}
}
}
return;
}
case ISD::EXTLOAD:
case ISD::SEXTLOAD:
case ISD::ZEXTLOAD:
case ISD::LOAD:
case ISD::CopyFromReg:
case ISD::TAILCALL:
case ISD::CALL:
case ISD::DYNAMIC_STACKALLOC:
ExprMap.erase(N);
SelectExpr(N);
return;
}
assert(0 && "Should not be reached!");
}
/// createPPCPatternInstructionSelector - This pass converts an LLVM function
/// into a machine code representation using pattern matching and a machine
/// description file.
///
FunctionPass *llvm::createPPCISelPattern(TargetMachine &TM) {
return new ISel(TM);
}
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