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llvm-6502/lib/Target/PowerPC/PPC64ISelPattern.cpp
Andrew Lenharth 691ef2ba06 Implement count leading zeros (ctlz), count trailing zeros (cttz), and count 
population (ctpop).  Generic lowering is implemented, however only promotion
is implemented for SelectionDAG at the moment.

More coming soon.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21676 91177308-0d34-0410-b5e6-96231b3b80d8
2005-05-03 17:19:30 +00:00

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//===-- PPC64ISelPattern.cpp - A pattern matching inst selector for PPC64 -===//
//
// 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 64 bit PowerPC.
//
//===----------------------------------------------------------------------===//
#include "PowerPC.h"
#include "PowerPCInstrBuilder.h"
#include "PowerPCInstrInfo.h"
#include "PPC64RegisterInfo.h"
#include "llvm/Constants.h" // FIXME: REMOVE
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineConstantPool.h" // FIXME: REMOVE
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLowering.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;
//===----------------------------------------------------------------------===//
// PPC32TargetLowering - PPC32 Implementation of the TargetLowering interface
namespace {
class PPC64TargetLowering : public TargetLowering {
int VarArgsFrameIndex; // FrameIndex for start of varargs area.
int ReturnAddrIndex; // FrameIndex for return slot.
public:
PPC64TargetLowering(TargetMachine &TM) : TargetLowering(TM) {
// Set up the register classes.
addRegisterClass(MVT::i64, PPC64::GPRCRegisterClass);
addRegisterClass(MVT::f32, PPC64::FPRCRegisterClass);
addRegisterClass(MVT::f64, PPC64::FPRCRegisterClass);
// PowerPC has no intrinsics for these particular operations
setOperationAction(ISD::BRCONDTWOWAY, MVT::Other, Expand);
setOperationAction(ISD::MEMMOVE, MVT::Other, Expand);
setOperationAction(ISD::MEMSET, MVT::Other, Expand);
setOperationAction(ISD::MEMCPY, MVT::Other, Expand);
// We don't support sin/cos/sqrt
setOperationAction(ISD::FSIN , MVT::f64, Expand);
setOperationAction(ISD::FCOS , MVT::f64, Expand);
setOperationAction(ISD::FSQRT, MVT::f64, Expand);
setOperationAction(ISD::FSIN , MVT::f32, Expand);
setOperationAction(ISD::FCOS , MVT::f32, Expand);
setOperationAction(ISD::FSQRT, MVT::f32, Expand);
// PPC 64 has i16 and i32 but no i8 (or i1) SEXTLOAD
setOperationAction(ISD::SEXTLOAD, MVT::i1, Expand);
setOperationAction(ISD::SEXTLOAD, MVT::i8, Expand);
// PowerPC has no SREM/UREM instructions
setOperationAction(ISD::SREM, MVT::i64, Expand);
setOperationAction(ISD::UREM, MVT::i64, Expand);
// PowerPC has these, but they are not implemented
setOperationAction(ISD::CTPOP, MVT::i64, Expand);
setOperationAction(ISD::CTTZ , MVT::i64, Expand);
setOperationAction(ISD::CTTZ , MVT::i64, Expand);
setShiftAmountFlavor(Extend); // shl X, 32 == 0
addLegalFPImmediate(+0.0); // Necessary for FSEL
addLegalFPImmediate(-0.0); //
computeRegisterProperties();
}
/// LowerArguments - This hook must be implemented to indicate how we should
/// lower the arguments for the specified function, into the specified DAG.
virtual std::vector<SDOperand>
LowerArguments(Function &F, SelectionDAG &DAG);
/// LowerCallTo - This hook lowers an abstract call to a function into an
/// actual call.
virtual std::pair<SDOperand, SDOperand>
LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg,
SDOperand Callee, ArgListTy &Args, SelectionDAG &DAG);
virtual std::pair<SDOperand, SDOperand>
LowerVAStart(SDOperand Chain, SelectionDAG &DAG);
virtual std::pair<SDOperand,SDOperand>
LowerVAArgNext(bool isVANext, SDOperand Chain, SDOperand VAList,
const Type *ArgTy, SelectionDAG &DAG);
virtual std::pair<SDOperand, SDOperand>
LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
SelectionDAG &DAG);
};
}
std::vector<SDOperand>
PPC64TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
//
// add beautiful description of PPC stack frame format, or at least some docs
//
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineBasicBlock& BB = MF.front();
std::vector<SDOperand> ArgValues;
// Due to the rather complicated nature of the PowerPC ABI, rather than a
// fixed size array of physical args, for the sake of simplicity let the STL
// handle tracking them for us.
std::vector<unsigned> argVR, argPR, argOp;
unsigned ArgOffset = 48;
unsigned GPR_remaining = 8;
unsigned FPR_remaining = 13;
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
};
// Add DAG nodes to load the arguments... On entry to a function on PPC,
// the arguments start at offset 48, although they are likely to be passed
// in registers.
for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
SDOperand newroot, argt;
bool needsLoad = false;
MVT::ValueType ObjectVT = getValueType(I->getType());
switch (ObjectVT) {
default: assert(0 && "Unhandled argument type!");
case MVT::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
case MVT::i64:
if (GPR_remaining > 0) {
BuildMI(&BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx]);
argt = newroot = DAG.getCopyFromReg(GPR[GPR_idx], MVT::i32,
DAG.getRoot());
if (ObjectVT != MVT::i64)
argt = DAG.getNode(ISD::TRUNCATE, ObjectVT, newroot);
} else {
needsLoad = true;
}
break;
case MVT::f32:
case MVT::f64:
if (FPR_remaining > 0) {
BuildMI(&BB, PPC::IMPLICIT_DEF, 0, FPR[FPR_idx]);
argt = newroot = DAG.getCopyFromReg(FPR[FPR_idx], ObjectVT,
DAG.getRoot());
--FPR_remaining;
++FPR_idx;
} else {
needsLoad = true;
}
break;
}
// We need to load the argument to a virtual register if we determined above
// that we ran out of physical registers of the appropriate type
if (needsLoad) {
unsigned SubregOffset = 0;
switch (ObjectVT) {
default: assert(0 && "Unhandled argument type!");
case MVT::i1:
case MVT::i8: SubregOffset = 7; break;
case MVT::i16: SubregOffset = 6; break;
case MVT::i32:
case MVT::f32: SubregOffset = 4; break;
case MVT::i64:
case MVT::f64: SubregOffset = 0; break;
}
int FI = MFI->CreateFixedObject(8, ArgOffset);
SDOperand FIN = DAG.getFrameIndex(FI, MVT::i64);
FIN = DAG.getNode(ISD::ADD, MVT::i64, FIN,
DAG.getConstant(SubregOffset, MVT::i64));
argt = newroot = DAG.getLoad(ObjectVT, DAG.getEntryNode(), FIN, DAG.getSrcValue(NULL));
}
// Every 4 bytes of argument space consumes one of the GPRs available for
// argument passing.
if (GPR_remaining > 0) {
--GPR_remaining;
++GPR_idx;
}
ArgOffset += 8;
DAG.setRoot(newroot.getValue(1));
ArgValues.push_back(argt);
}
// If the function takes variable number of arguments, make a frame index for
// the start of the first vararg value... for expansion of llvm.va_start.
if (F.isVarArg()) {
VarArgsFrameIndex = MFI->CreateFixedObject(8, ArgOffset);
SDOperand FIN = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i64);
// If this function is vararg, store any remaining integer argument regs
// to their spots on the stack so that they may be loaded by deferencing the
// result of va_next.
std::vector<SDOperand> MemOps;
for (; GPR_remaining > 0; --GPR_remaining, ++GPR_idx) {
BuildMI(&BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx]);
SDOperand Val = DAG.getCopyFromReg(GPR[GPR_idx], MVT::i64, DAG.getRoot());
SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Val.getValue(1),
Val, FIN, DAG.getSrcValue(NULL));
MemOps.push_back(Store);
// Increment the address by eight for the next argument to store
SDOperand PtrOff = DAG.getConstant(8, getPointerTy());
FIN = DAG.getNode(ISD::ADD, MVT::i32, FIN, PtrOff);
}
DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, MemOps));
}
return ArgValues;
}
std::pair<SDOperand, SDOperand>
PPC64TargetLowering::LowerCallTo(SDOperand Chain,
const Type *RetTy, bool isVarArg,
SDOperand Callee, ArgListTy &Args,
SelectionDAG &DAG) {
// args_to_use will accumulate outgoing args for the ISD::CALL case in
// SelectExpr to use to put the arguments in the appropriate registers.
std::vector<SDOperand> args_to_use;
// Count how many bytes are to be pushed on the stack, including the linkage
// area, and parameter passing area.
unsigned NumBytes = 48;
if (Args.empty()) {
Chain = DAG.getNode(ISD::ADJCALLSTACKDOWN, MVT::Other, Chain,
DAG.getConstant(NumBytes, getPointerTy()));
} else {
NumBytes = 8 * Args.size(); // All arguments are rounded up to 8 bytes
// Just to be safe, we'll always reserve the full 48 bytes of linkage area
// plus 64 bytes of argument space in case any called code gets funky on us.
if (NumBytes < 112) NumBytes = 112;
// Adjust the stack pointer for the new arguments...
// These operations are automatically eliminated by the prolog/epilog pass
Chain = DAG.getNode(ISD::ADJCALLSTACKDOWN, MVT::Other, Chain,
DAG.getConstant(NumBytes, getPointerTy()));
// Set up a copy of the stack pointer for use loading and storing any
// arguments that may not fit in the registers available for argument
// passing.
SDOperand StackPtr = DAG.getCopyFromReg(PPC::R1, MVT::i32,
DAG.getEntryNode());
// Figure out which arguments are going to go in registers, and which in
// memory. Also, if this is a vararg function, floating point operations
// must be stored to our stack, and loaded into integer regs as well, if
// any integer regs are available for argument passing.
unsigned ArgOffset = 48;
unsigned GPR_remaining = 8;
unsigned FPR_remaining = 13;
std::vector<SDOperand> MemOps;
for (unsigned i = 0, e = Args.size(); i != e; ++i) {
// PtrOff will be used to store the current argument to the stack if a
// register cannot be found for it.
SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
MVT::ValueType ArgVT = getValueType(Args[i].second);
switch (ArgVT) {
default: assert(0 && "Unexpected ValueType for argument!");
case MVT::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
// Promote the integer to 64 bits. If the input type is signed use a
// sign extend, otherwise use a zero extend.
if (Args[i].second->isSigned())
Args[i].first =DAG.getNode(ISD::SIGN_EXTEND, MVT::i64, Args[i].first);
else
Args[i].first =DAG.getNode(ISD::ZERO_EXTEND, MVT::i64, Args[i].first);
// FALL THROUGH
case MVT::i64:
if (GPR_remaining > 0) {
args_to_use.push_back(Args[i].first);
--GPR_remaining;
} else {
MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
Args[i].first, PtrOff, DAG.getSrcValue(NULL)));
}
ArgOffset += 8;
break;
case MVT::f32:
case MVT::f64:
if (FPR_remaining > 0) {
args_to_use.push_back(Args[i].first);
--FPR_remaining;
if (isVarArg) {
SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Chain,
Args[i].first, PtrOff, DAG.getSrcValue(NULL));
MemOps.push_back(Store);
// Float varargs are always shadowed in available integer registers
if (GPR_remaining > 0) {
SDOperand Load = DAG.getLoad(MVT::i64, Store, PtrOff, DAG.getSrcValue(NULL));
MemOps.push_back(Load);
args_to_use.push_back(Load);
--GPR_remaining;
}
} else {
// If we have any FPRs remaining, we may also have GPRs remaining.
// Args passed in FPRs also consume an available GPR.
if (GPR_remaining > 0) {
args_to_use.push_back(DAG.getNode(ISD::UNDEF, MVT::i64));
--GPR_remaining;
}
}
} else {
MemOps.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
Args[i].first, PtrOff, DAG.getSrcValue(NULL)));
}
ArgOffset += 8;
break;
}
}
if (!MemOps.empty())
Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, MemOps);
}
std::vector<MVT::ValueType> RetVals;
MVT::ValueType RetTyVT = getValueType(RetTy);
if (RetTyVT != MVT::isVoid)
RetVals.push_back(RetTyVT);
RetVals.push_back(MVT::Other);
SDOperand TheCall = SDOperand(DAG.getCall(RetVals,
Chain, Callee, args_to_use), 0);
Chain = TheCall.getValue(RetTyVT != MVT::isVoid);
Chain = DAG.getNode(ISD::ADJCALLSTACKUP, MVT::Other, Chain,
DAG.getConstant(NumBytes, getPointerTy()));
return std::make_pair(TheCall, Chain);
}
std::pair<SDOperand, SDOperand>
PPC64TargetLowering::LowerVAStart(SDOperand Chain, SelectionDAG &DAG) {
//vastart just returns the address of the VarArgsFrameIndex slot.
return std::make_pair(DAG.getFrameIndex(VarArgsFrameIndex, MVT::i64), Chain);
}
std::pair<SDOperand,SDOperand> PPC64TargetLowering::
LowerVAArgNext(bool isVANext, SDOperand Chain, SDOperand VAList,
const Type *ArgTy, SelectionDAG &DAG) {
MVT::ValueType ArgVT = getValueType(ArgTy);
SDOperand Result;
if (!isVANext) {
Result = DAG.getLoad(ArgVT, DAG.getEntryNode(), VAList, DAG.getSrcValue(NULL));
} else {
Result = DAG.getNode(ISD::ADD, VAList.getValueType(), VAList,
DAG.getConstant(8, VAList.getValueType()));
}
return std::make_pair(Result, Chain);
}
std::pair<SDOperand, SDOperand> PPC64TargetLowering::
LowerFrameReturnAddress(bool isFrameAddress, SDOperand Chain, unsigned Depth,
SelectionDAG &DAG) {
assert(0 && "LowerFrameReturnAddress unimplemented");
abort();
}
namespace {
Statistic<>NotLogic("ppc-codegen", "Number of inverted logical ops");
Statistic<>FusedFP("ppc-codegen", "Number of fused fp operations");
//===--------------------------------------------------------------------===//
/// ISel - PPC32 specific code to select PPC32 machine instructions for
/// SelectionDAG operations.
//===--------------------------------------------------------------------===//
class ISel : public SelectionDAGISel {
/// Comment Here.
PPC64TargetLowering PPC64Lowering;
/// 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;
public:
ISel(TargetMachine &TM) : SelectionDAGISel(PPC64Lowering), PPC64Lowering(TM)
{}
/// 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.
Select(DAG.getRoot());
// Clear state used for selection.
ExprMap.clear();
}
unsigned getGlobalBaseReg();
unsigned getConstDouble(double floatVal, unsigned Result);
unsigned SelectSetCR0(SDOperand CC);
unsigned SelectExpr(SDOperand N);
unsigned SelectExprFP(SDOperand N, unsigned Result);
void Select(SDOperand N);
bool SelectAddr(SDOperand N, unsigned& Reg, int& offset);
void SelectBranchCC(SDOperand N);
};
/// ExactLog2 - This function solves for (Val == 1 << (N-1)) and returns N. It
/// returns zero when the input is not exactly a power of two.
static unsigned ExactLog2(unsigned Val) {
if (Val == 0 || (Val & (Val-1))) return 0;
unsigned Count = 0;
while (Val != 1) {
Val >>= 1;
++Count;
}
return Count;
}
/// getImmediateForOpcode - This method returns a value indicating whether
/// the ConstantSDNode N can be used as an immediate to Opcode. The return
/// values are either 0, 1 or 2. 0 indicates that either N is not a
/// ConstantSDNode, or is not suitable for use by that opcode. A return value
/// of 1 indicates that the constant may be used in normal immediate form. A
/// return value of 2 indicates that the constant may be used in shifted
/// immediate form. A return value of 3 indicates that log base 2 of the
/// constant may be used.
///
static unsigned getImmediateForOpcode(SDOperand N, unsigned Opcode,
unsigned& Imm, bool U = false) {
if (N.getOpcode() != ISD::Constant) return 0;
int v = (int)cast<ConstantSDNode>(N)->getSignExtended();
switch(Opcode) {
default: return 0;
case ISD::ADD:
if (v <= 32767 && v >= -32768) { Imm = v & 0xFFFF; return 1; }
if ((v & 0x0000FFFF) == 0) { Imm = v >> 16; return 2; }
break;
case ISD::AND:
case ISD::XOR:
case ISD::OR:
if (v >= 0 && v <= 65535) { Imm = v & 0xFFFF; return 1; }
if ((v & 0x0000FFFF) == 0) { Imm = v >> 16; return 2; }
break;
case ISD::MUL:
case ISD::SUB:
if (v <= 32767 && v >= -32768) { Imm = v & 0xFFFF; return 1; }
break;
case ISD::SETCC:
if (U && (v >= 0 && v <= 65535)) { Imm = v & 0xFFFF; return 1; }
if (!U && (v <= 32767 && v >= -32768)) { Imm = v & 0xFFFF; return 1; }
break;
case ISD::SDIV:
if ((Imm = ExactLog2(v))) { return 3; }
break;
}
return 0;
}
/// getBCCForSetCC - Returns the PowerPC condition branch mnemonic corresponding
/// to Condition. If the Condition is unordered or unsigned, the bool argument
/// U is set to true, otherwise it is set to false.
static unsigned getBCCForSetCC(unsigned Condition, bool& U) {
U = false;
switch (Condition) {
default: assert(0 && "Unknown condition!"); abort();
case ISD::SETEQ: return PPC::BEQ;
case ISD::SETNE: return PPC::BNE;
case ISD::SETULT: U = true;
case ISD::SETLT: return PPC::BLT;
case ISD::SETULE: U = true;
case ISD::SETLE: return PPC::BLE;
case ISD::SETUGT: U = true;
case ISD::SETGT: return PPC::BGT;
case ISD::SETUGE: U = true;
case ISD::SETGE: return PPC::BGE;
}
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::STD: return PPC::STDX;
case PPC::LD: return PPC::LDX; 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 = MakeReg(MVT::i64);
BuildMI(FirstMBB, MBBI, PPC::MovePCtoLR, 0, PPC::LR);
BuildMI(FirstMBB, MBBI, PPC::MFLR, 1, GlobalBaseReg).addReg(PPC::LR);
GlobalBaseInitialized = true;
}
return GlobalBaseReg;
}
/// getConstDouble - Loads a floating point value into a register, via the
/// Constant Pool. Optionally takes a register in which to load the value.
unsigned ISel::getConstDouble(double doubleVal, unsigned Result=0) {
unsigned Tmp1 = MakeReg(MVT::i64);
if (0 == Result) Result = MakeReg(MVT::f64);
MachineConstantPool *CP = BB->getParent()->getConstantPool();
ConstantFP *CFP = ConstantFP::get(Type::DoubleTy, doubleVal);
unsigned CPI = CP->getConstantPoolIndex(CFP);
BuildMI(BB, PPC::LOADHiAddr, 2, Tmp1).addReg(getGlobalBaseReg())
.addConstantPoolIndex(CPI);
BuildMI(BB, PPC::LFD, 2, Result).addConstantPoolIndex(CPI).addReg(Tmp1);
return Result;
}
unsigned ISel::SelectSetCR0(SDOperand CC) {
unsigned Opc, Tmp1, Tmp2;
static const unsigned CompareOpcodes[] =
{ PPC::FCMPU, PPC::FCMPU, PPC::CMPW, PPC::CMPLW };
// If the first operand to the select is a SETCC node, then we can fold it
// into the branch that selects which value to return.
SetCCSDNode* SetCC = dyn_cast<SetCCSDNode>(CC.Val);
if (SetCC && CC.getOpcode() == ISD::SETCC) {
bool U;
Opc = getBCCForSetCC(SetCC->getCondition(), U);
Tmp1 = SelectExpr(SetCC->getOperand(0));
// Pass the optional argument U to getImmediateForOpcode for SETCC,
// so that it knows whether the SETCC immediate range is signed or not.
if (1 == getImmediateForOpcode(SetCC->getOperand(1), ISD::SETCC,
Tmp2, U)) {
if (U)
BuildMI(BB, PPC::CMPLWI, 2, PPC::CR0).addReg(Tmp1).addImm(Tmp2);
else
BuildMI(BB, PPC::CMPWI, 2, PPC::CR0).addReg(Tmp1).addSImm(Tmp2);
} else {
bool IsInteger = MVT::isInteger(SetCC->getOperand(0).getValueType());
unsigned CompareOpc = CompareOpcodes[2 * IsInteger + U];
Tmp2 = SelectExpr(SetCC->getOperand(1));
BuildMI(BB, CompareOpc, 2, PPC::CR0).addReg(Tmp1).addReg(Tmp2);
}
} else {
Tmp1 = SelectExpr(CC);
BuildMI(BB, PPC::CMPLWI, 2, PPC::CR0).addReg(Tmp1).addImm(0);
Opc = PPC::BNE;
}
return Opc;
}
/// Check to see if the load is a constant offset from a base register
bool ISel::SelectAddr(SDOperand N, unsigned& Reg, int& offset)
{
unsigned imm = 0, opcode = N.getOpcode();
if (N.getOpcode() == ISD::ADD) {
Reg = SelectExpr(N.getOperand(0));
if (1 == getImmediateForOpcode(N.getOperand(1), opcode, imm)) {
offset = imm;
return false;
}
offset = SelectExpr(N.getOperand(1));
return true;
}
Reg = SelectExpr(N);
offset = 0;
return false;
}
void ISel::SelectBranchCC(SDOperand N)
{
assert(N.getOpcode() == ISD::BRCOND && "Not a BranchCC???");
MachineBasicBlock *Dest =
cast<BasicBlockSDNode>(N.getOperand(2))->getBasicBlock();
// Get the MBB we will fall through to so that we can hand it off to the
// branch selection pass as an argument to the PPC::COND_BRANCH pseudo op.
//ilist<MachineBasicBlock>::iterator It = BB;
//MachineBasicBlock *Fallthrough = ++It;
Select(N.getOperand(0)); //chain
unsigned Opc = SelectSetCR0(N.getOperand(1));
// FIXME: Use this once we have something approximating two-way branches
// We cannot currently use this in case the ISel hands us something like
// BRcc MBBx
// BR MBBy
// since the fallthrough basic block for the conditional branch does not start
// with the unconditional branch (it is skipped over).
//BuildMI(BB, PPC::COND_BRANCH, 4).addReg(PPC::CR0).addImm(Opc)
// .addMBB(Dest).addMBB(Fallthrough);
BuildMI(BB, Opc, 2).addReg(PPC::CR0).addMBB(Dest);
return;
}
unsigned ISel::SelectExprFP(SDOperand N, unsigned Result)
{
unsigned Tmp1, Tmp2, Tmp3;
unsigned Opc = 0;
SDNode *Node = N.Val;
MVT::ValueType DestType = N.getValueType();
unsigned opcode = N.getOpcode();
switch (opcode) {
default:
Node->dump();
assert(0 && "Node not handled!\n");
case ISD::SELECT: {
// Attempt to generate FSEL. We can do this whenever we have an FP result,
// and an FP comparison in the SetCC node.
SetCCSDNode* SetCC = dyn_cast<SetCCSDNode>(N.getOperand(0).Val);
if (SetCC && N.getOperand(0).getOpcode() == ISD::SETCC &&
!MVT::isInteger(SetCC->getOperand(0).getValueType()) &&
SetCC->getCondition() != ISD::SETEQ &&
SetCC->getCondition() != ISD::SETNE) {
MVT::ValueType VT = SetCC->getOperand(0).getValueType();
Tmp1 = SelectExpr(SetCC->getOperand(0)); // Val to compare against
unsigned TV = SelectExpr(N.getOperand(1)); // Use if TRUE
unsigned FV = SelectExpr(N.getOperand(2)); // Use if FALSE
ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(SetCC->getOperand(1));
if (CN && (CN->isExactlyValue(-0.0) || CN->isExactlyValue(0.0))) {
switch(SetCC->getCondition()) {
default: assert(0 && "Invalid FSEL condition"); abort();
case ISD::SETULT:
case ISD::SETLT:
BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp1).addReg(FV).addReg(TV);
return Result;
case ISD::SETUGE:
case ISD::SETGE:
BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp1).addReg(TV).addReg(FV);
return Result;
case ISD::SETUGT:
case ISD::SETGT: {
Tmp2 = MakeReg(VT);
BuildMI(BB, PPC::FNEG, 1, Tmp2).addReg(Tmp1);
BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp2).addReg(FV).addReg(TV);
return Result;
}
case ISD::SETULE:
case ISD::SETLE: {
Tmp2 = MakeReg(VT);
BuildMI(BB, PPC::FNEG, 1, Tmp2).addReg(Tmp1);
BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp2).addReg(TV).addReg(FV);
return Result;
}
}
} else {
Opc = (MVT::f64 == VT) ? PPC::FSUB : PPC::FSUBS;
Tmp2 = SelectExpr(SetCC->getOperand(1));
Tmp3 = MakeReg(VT);
switch(SetCC->getCondition()) {
default: assert(0 && "Invalid FSEL condition"); abort();
case ISD::SETULT:
case ISD::SETLT:
BuildMI(BB, Opc, 2, Tmp3).addReg(Tmp1).addReg(Tmp2);
BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp3).addReg(FV).addReg(TV);
return Result;
case ISD::SETUGE:
case ISD::SETGE:
BuildMI(BB, Opc, 2, Tmp3).addReg(Tmp1).addReg(Tmp2);
BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp3).addReg(TV).addReg(FV);
return Result;
case ISD::SETUGT:
case ISD::SETGT:
BuildMI(BB, Opc, 2, Tmp3).addReg(Tmp2).addReg(Tmp1);
BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp3).addReg(FV).addReg(TV);
return Result;
case ISD::SETULE:
case ISD::SETLE:
BuildMI(BB, Opc, 2, Tmp3).addReg(Tmp2).addReg(Tmp1);
BuildMI(BB, PPC::FSEL, 3, Result).addReg(Tmp3).addReg(TV).addReg(FV);
return Result;
}
}
assert(0 && "Should never get here");
return 0;
}
unsigned TrueValue = SelectExpr(N.getOperand(1)); //Use if TRUE
unsigned FalseValue = SelectExpr(N.getOperand(2)); //Use if FALSE
Opc = SelectSetCR0(N.getOperand(0));
// 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 cr0, r1, r2
// bCC copy1MBB
// fallthrough --> copy0MBB
MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
BuildMI(BB, Opc, 2).addReg(PPC::CR0).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;
// 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::FNEG:
if (!NoExcessFPPrecision &&
ISD::ADD == N.getOperand(0).getOpcode() &&
N.getOperand(0).Val->hasOneUse() &&
ISD::MUL == 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::SUB == N.getOperand(0).getOpcode() &&
N.getOperand(0).Val->hasOneUse() &&
ISD::MUL == 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::FNMSUB : PPC::FNMSUBS;
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));
BuildMI(BB, PPC::FNABS, 1, Result).addReg(Tmp1);
} else {
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::FNEG, 1, Result).addReg(Tmp1);
}
return Result;
case ISD::FABS:
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::FABS, 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::FMR, 1, Result).addReg(Tmp1);
return Result;
case ISD::CopyFromReg:
if (Result == 1)
Result = ExprMap[N.getValue(0)] = MakeReg(N.getValue(0).getValueType());
Tmp1 = dyn_cast<RegSDNode>(Node)->getReg();
BuildMI(BB, PPC::FMR, 1, Result).addReg(Tmp1);
return Result;
case ISD::ConstantFP: {
ConstantFPSDNode *CN = cast<ConstantFPSDNode>(N);
Result = getConstDouble(CN->getValue(), Result);
return Result;
}
case ISD::ADD:
if (!NoExcessFPPrecision && N.getOperand(0).getOpcode() == ISD::MUL &&
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;
}
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::SUB:
if (!NoExcessFPPrecision && N.getOperand(0).getOpcode() == ISD::MUL &&
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;
}
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::MUL:
case ISD::SDIV:
switch( opcode ) {
case ISD::MUL: Opc = DestType == MVT::f64 ? PPC::FMUL : PPC::FMULS; break;
case ISD::SDIV: Opc = DestType == MVT::f64 ? PPC::FDIV : PPC::FDIVS; break;
};
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::UINT_TO_FP:
case ISD::SINT_TO_FP: {
bool IsUnsigned = (ISD::UINT_TO_FP == opcode);
Tmp1 = SelectExpr(N.getOperand(0)); // Get the operand register
Tmp2 = MakeReg(MVT::f64); // temp reg to load the integer value into
Tmp3 = MakeReg(MVT::i64); // temp reg to hold the conversion constant
unsigned ConstF = MakeReg(MVT::f64); // temp reg to hold the fp constant
int FrameIdx = BB->getParent()->getFrameInfo()->CreateStackObject(8, 8);
MachineConstantPool *CP = BB->getParent()->getConstantPool();
// FIXME: pull this FP constant generation stuff out into something like
// the simple ISel's getReg.
if (IsUnsigned) {
addFrameReference(BuildMI(BB, PPC::STD, 3).addReg(Tmp1), FrameIdx);
addFrameReference(BuildMI(BB, PPC::LFD, 2, Tmp2), FrameIdx);
BuildMI(BB, PPC::FCFID, 1, Result).addReg(Tmp2);
} else {
ConstantFP *CFP = ConstantFP::get(Type::DoubleTy, 0x1.000008p52);
unsigned CPI = CP->getConstantPoolIndex(CFP);
// Load constant fp value
unsigned Tmp4 = MakeReg(MVT::i32);
unsigned TmpL = MakeReg(MVT::i32);
BuildMI(BB, PPC::LOADHiAddr, 2, Tmp4).addReg(getGlobalBaseReg())
.addConstantPoolIndex(CPI);
BuildMI(BB, PPC::LFD, 2, ConstF).addConstantPoolIndex(CPI).addReg(Tmp4);
// Store the hi & low halves of the fp value, currently in int regs
BuildMI(BB, PPC::LIS, 1, Tmp3).addSImm(0x4330);
addFrameReference(BuildMI(BB, PPC::STW, 3).addReg(Tmp3), FrameIdx);
BuildMI(BB, PPC::XORIS, 2, TmpL).addReg(Tmp1).addImm(0x8000);
addFrameReference(BuildMI(BB, PPC::STW, 3).addReg(TmpL), FrameIdx, 4);
addFrameReference(BuildMI(BB, PPC::LFD, 2, Tmp2), FrameIdx);
// Generate the return value with a subtract
BuildMI(BB, PPC::FSUB, 2, Result).addReg(Tmp2).addReg(ConstF);
}
return Result;
}
}
assert(0 && "Should never get here");
return 0;
}
unsigned ISel::SelectExpr(SDOperand N) {
unsigned Result;
unsigned Tmp1, Tmp2, Tmp3;
unsigned Opc = 0;
unsigned opcode = N.getOpcode();
SDNode *Node = N.Val;
MVT::ValueType DestType = N.getValueType();
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::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;
}
if (ISD::CopyFromReg == opcode)
DestType = N.getValue(0).getValueType();
if (DestType == MVT::f64 || DestType == MVT::f32)
if (ISD::LOAD != opcode && ISD::EXTLOAD != opcode && ISD::UNDEF != opcode)
return SelectExprFP(N, Result);
switch (opcode) {
default:
Node->dump();
assert(0 && "Node not handled!\n");
case ISD::UNDEF:
BuildMI(BB, PPC::IMPLICIT_DEF, 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::OR, 2, Result).addReg(PPC::R1).addReg(PPC::R1);
return Result;
case ISD::ConstantPool:
Tmp1 = cast<ConstantPoolSDNode>(N)->getIndex();
Tmp2 = MakeReg(MVT::i64);
BuildMI(BB, PPC::LOADHiAddr, 2, Tmp2).addReg(getGlobalBaseReg())
.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 = MakeReg(MVT::i64);
BuildMI(BB, PPC::LOADHiAddr, 2, Tmp1).addReg(getGlobalBaseReg())
.addGlobalAddress(GV);
if (GV->hasWeakLinkage() || GV->isExternal()) {
BuildMI(BB, PPC::LD, 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<MVTSDNode>(Node)->getExtraValueType();
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 = sext ? PPC::LWA : PPC::LWZ; break;
case MVT::i64: Opc = PPC::LD; break;
case MVT::f32: Opc = PPC::LFS; break;
case MVT::f64: Opc = PPC::LFD; break;
}
if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Address)) {
Tmp1 = MakeReg(MVT::i64);
int CPI = CP->getIndex();
BuildMI(BB, PPC::LOADHiAddr, 2, Tmp1).addReg(getGlobalBaseReg())
.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;
bool idx = SelectAddr(Address, Tmp1, offset);
if (idx) {
Opc = IndexedOpForOp(Opc);
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(offset);
} else {
BuildMI(BB, Opc, 2, Result).addSImm(offset).addReg(Tmp1);
}
}
return Result;
}
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::OR, 2, PPC::R12).addReg(Tmp1).addReg(Tmp1);
BuildMI(BB, PPC::MTCTR, 1).addReg(PPC::R12);
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::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
case MVT::i64:
assert(GPR_idx < 8 && "Too many int args");
if (N.getOperand(i+2).getOpcode() != ISD::UNDEF) {
BuildMI(BB, PPC::OR,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, PPC::FMR, 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::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
case MVT::i64:
BuildMI(BB, PPC::OR, 2, Result).addReg(PPC::R3).addReg(PPC::R3);
break;
case MVT::f32:
case MVT::f64:
BuildMI(BB, PPC::FMR, 1, Result).addReg(PPC::F1);
break;
}
return Result+N.ResNo;
}
case ISD::SIGN_EXTEND:
case ISD::SIGN_EXTEND_INREG:
Tmp1 = SelectExpr(N.getOperand(0));
switch(cast<MVTSDNode>(Node)->getExtraValueType()) {
default: Node->dump(); assert(0 && "Unhandled SIGN_EXTEND type"); break;
case MVT::i32:
BuildMI(BB, PPC::EXTSW, 1, Result).addReg(Tmp1);
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;
case MVT::i1:
BuildMI(BB, PPC::SUBFIC, 2, Result).addReg(Tmp1).addSImm(0);
break;
}
return Result;
case ISD::CopyFromReg:
if (Result == 1)
Result = ExprMap[N.getValue(0)] = MakeReg(N.getValue(0).getValueType());
Tmp1 = dyn_cast<RegSDNode>(Node)->getReg();
BuildMI(BB, PPC::OR, 2, Result).addReg(Tmp1).addReg(Tmp1);
return Result;
case ISD::SHL:
Tmp1 = SelectExpr(N.getOperand(0));
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
Tmp2 = CN->getValue() & 0x3F;
BuildMI(BB, PPC::RLDICR, 3, Result).addReg(Tmp1).addImm(Tmp2)
.addImm(63-Tmp2);
} else {
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::SLD, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::SRL:
Tmp1 = SelectExpr(N.getOperand(0));
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
Tmp2 = CN->getValue() & 0x3F;
BuildMI(BB, PPC::RLDICL, 3, Result).addReg(Tmp1).addImm(64-Tmp2)
.addImm(Tmp2);
} else {
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::SRD, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::SRA:
Tmp1 = SelectExpr(N.getOperand(0));
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
Tmp2 = CN->getValue() & 0x3F;
BuildMI(BB, PPC::SRADI, 2, Result).addReg(Tmp1).addImm(Tmp2);
} else {
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::SRAD, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::ADD:
Tmp1 = SelectExpr(N.getOperand(0));
switch(getImmediateForOpcode(N.getOperand(1), opcode, Tmp2)) {
default: assert(0 && "unhandled result code");
case 0: // No immediate
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::ADD, 2, Result).addReg(Tmp1).addReg(Tmp2);
break;
case 1: // Low immediate
BuildMI(BB, PPC::ADDI, 2, Result).addReg(Tmp1).addSImm(Tmp2);
break;
case 2: // Shifted immediate
BuildMI(BB, PPC::ADDIS, 2, Result).addReg(Tmp1).addSImm(Tmp2);
break;
}
return Result;
case ISD::AND:
case ISD::OR:
Tmp1 = SelectExpr(N.getOperand(0));
switch(getImmediateForOpcode(N.getOperand(1), opcode, Tmp2)) {
default: assert(0 && "unhandled result code");
case 0: // No immediate
Tmp2 = SelectExpr(N.getOperand(1));
switch (opcode) {
case ISD::AND: Opc = PPC::AND; break;
case ISD::OR: Opc = PPC::OR; break;
}
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
break;
case 1: // Low immediate
switch (opcode) {
case ISD::AND: Opc = PPC::ANDIo; break;
case ISD::OR: Opc = PPC::ORI; break;
}
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addImm(Tmp2);
break;
case 2: // Shifted immediate
switch (opcode) {
case ISD::AND: Opc = PPC::ANDISo; break;
case ISD::OR: Opc = PPC::ORIS; break;
}
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addImm(Tmp2);
break;
}
return Result;
case ISD::XOR: {
// Check for EQV: xor, (xor a, -1), b
if (N.getOperand(0).getOpcode() == ISD::XOR &&
N.getOperand(0).getOperand(1).getOpcode() == ISD::Constant &&
cast<ConstantSDNode>(N.getOperand(0).getOperand(1))->isAllOnesValue()) {
++NotLogic;
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, and NAND: xor (copy, or, and), -1
if (N.getOperand(1).getOpcode() == ISD::Constant &&
cast<ConstantSDNode>(N.getOperand(1))->isAllOnesValue()) {
++NotLogic;
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;
default:
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::NOR, 2, Result).addReg(Tmp1).addReg(Tmp1);
break;
}
return Result;
}
Tmp1 = SelectExpr(N.getOperand(0));
switch(getImmediateForOpcode(N.getOperand(1), opcode, Tmp2)) {
default: assert(0 && "unhandled result code");
case 0: // No immediate
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::XOR, 2, Result).addReg(Tmp1).addReg(Tmp2);
break;
case 1: // Low immediate
BuildMI(BB, PPC::XORI, 2, Result).addReg(Tmp1).addImm(Tmp2);
break;
case 2: // Shifted immediate
BuildMI(BB, PPC::XORIS, 2, Result).addReg(Tmp1).addImm(Tmp2);
break;
}
return Result;
}
case ISD::SUB:
Tmp2 = SelectExpr(N.getOperand(1));
if (1 == getImmediateForOpcode(N.getOperand(0), opcode, Tmp1))
BuildMI(BB, PPC::SUBFIC, 2, Result).addReg(Tmp2).addSImm(Tmp1);
else {
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::SUBF, 2, Result).addReg(Tmp2).addReg(Tmp1);
}
return Result;
case ISD::MUL:
Tmp1 = SelectExpr(N.getOperand(0));
if (1 == getImmediateForOpcode(N.getOperand(1), opcode, Tmp2))
BuildMI(BB, PPC::MULLI, 2, Result).addReg(Tmp1).addSImm(Tmp2);
else {
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::MULLD, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::SDIV:
case ISD::UDIV:
if (3 == getImmediateForOpcode(N.getOperand(1), opcode, Tmp3)) {
Tmp1 = MakeReg(MVT::i64);
Tmp2 = SelectExpr(N.getOperand(0));
BuildMI(BB, PPC::SRADI, 2, Tmp1).addReg(Tmp2).addImm(Tmp3);
BuildMI(BB, PPC::ADDZE, 1, Result).addReg(Tmp1);
return Result;
}
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
Opc = (ISD::UDIV == opcode) ? PPC::DIVWU : PPC::DIVW;
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::FP_TO_UINT:
case ISD::FP_TO_SINT: {
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = MakeReg(MVT::f64);
BuildMI(BB, PPC::FCTIDZ, 1, Tmp2).addReg(Tmp1);
int FrameIdx = BB->getParent()->getFrameInfo()->CreateStackObject(8, 8);
addFrameReference(BuildMI(BB, PPC::STFD, 3).addReg(Tmp2), FrameIdx);
addFrameReference(BuildMI(BB, PPC::LD, 2, Result), FrameIdx);
return Result;
}
case ISD::SETCC:
if (SetCCSDNode *SetCC = dyn_cast<SetCCSDNode>(Node)) {
Opc = SelectSetCR0(N);
unsigned TrueValue = MakeReg(MVT::i32);
BuildMI(BB, PPC::LI, 1, TrueValue).addSImm(1);
unsigned FalseValue = MakeReg(MVT::i32);
BuildMI(BB, PPC::LI, 1, FalseValue).addSImm(0);
// 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:
// ...
// cmpTY cr0, r1, r2
// %TrueValue = li 1
// bCC sinkMBB
MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
BuildMI(BB, Opc, 2).addReg(PPC::CR0).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 = li 0
// fallthrough
BB = copy0MBB;
// 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;
}
assert(0 && "Is this legal?");
return 0;
case ISD::SELECT: {
unsigned TrueValue = SelectExpr(N.getOperand(1)); //Use if TRUE
unsigned FalseValue = SelectExpr(N.getOperand(2)); //Use if FALSE
Opc = SelectSetCR0(N.getOperand(0));
// 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 cr0, r1, r2
// bCC copy1MBB
// fallthrough --> copy0MBB
MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
BuildMI(BB, Opc, 2).addReg(PPC::CR0).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;
// 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);
// FIXME: Select i64?
return Result;
}
case ISD::Constant:
switch (N.getValueType()) {
default: assert(0 && "Cannot use constants of this type!");
case MVT::i1:
BuildMI(BB, PPC::LI, 1, Result)
.addSImm(!cast<ConstantSDNode>(N)->isNullValue());
break;
case MVT::i32:
{
int v = (int)cast<ConstantSDNode>(N)->getSignExtended();
if (v < 32768 && v >= -32768) {
BuildMI(BB, PPC::LI, 1, Result).addSImm(v);
} else {
Tmp1 = MakeReg(MVT::i32);
BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(v >> 16);
BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(v & 0xFFFF);
}
}
}
return Result;
}
return 0;
}
void ISel::Select(SDOperand N) {
unsigned Tmp1, Tmp2, 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::ADJCALLSTACKDOWN:
case ISD::ADJCALLSTACKUP:
Select(N.getOperand(0));
Tmp1 = cast<ConstantSDNode>(N.getOperand(1))->getValue();
Opc = N.getOpcode() == ISD::ADJCALLSTACKDOWN ? 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::BRCOND:
SelectBranchCC(N);
return;
case ISD::CopyToReg:
Select(N.getOperand(0));
Tmp1 = SelectExpr(N.getOperand(1));
Tmp2 = cast<RegSDNode>(N)->getReg();
if (Tmp1 != Tmp2) {
if (N.getOperand(1).getValueType() == MVT::f64 ||
N.getOperand(1).getValueType() == MVT::f32)
BuildMI(BB, PPC::FMR, 1, Tmp2).addReg(Tmp1);
else
BuildMI(BB, PPC::OR, 2, Tmp2).addReg(Tmp1).addReg(Tmp1);
}
return;
case ISD::ImplicitDef:
Select(N.getOperand(0));
BuildMI(BB, PPC::IMPLICIT_DEF, 0, cast<RegSDNode>(N)->getReg());
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::OR, 2, PPC::R3).addReg(Tmp2).addReg(Tmp2);
BuildMI(BB, PPC::OR, 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:
case MVT::f32:
BuildMI(BB, PPC::FMR, 1, PPC::F1).addReg(Tmp1);
break;
case MVT::i32:
BuildMI(BB, PPC::OR, 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::i64: Opc = PPC::STD; break;
case MVT::f64: Opc = PPC::STFD; break;
case MVT::f32: Opc = PPC::STFS; break;
}
} else { //ISD::TRUNCSTORE
switch(cast<MVTSDNode>(Node)->getExtraValueType()) {
default: assert(0 && "unknown Type in store");
case MVT::i1: //FIXME: DAG does not promote this load
case MVT::i8: Opc= PPC::STB; break;
case MVT::i16: Opc = PPC::STH; break;
case MVT::i32: Opc = PPC::STW; break;
}
}
if(Address.getOpcode() == ISD::FrameIndex)
{
Tmp2 = cast<FrameIndexSDNode>(Address)->getIndex();
addFrameReference(BuildMI(BB, Opc, 3).addReg(Tmp1), (int)Tmp2);
}
else
{
int offset;
bool idx = SelectAddr(Address, Tmp2, offset);
if (idx) {
Opc = IndexedOpForOp(Opc);
BuildMI(BB, Opc, 3).addReg(Tmp1).addReg(Tmp2).addReg(offset);
} else {
BuildMI(BB, Opc, 3).addReg(Tmp1).addImm(offset).addReg(Tmp2);
}
}
return;
}
case ISD::EXTLOAD:
case ISD::SEXTLOAD:
case ISD::ZEXTLOAD:
case ISD::LOAD:
case ISD::CopyFromReg:
case ISD::CALL:
case ISD::DYNAMIC_STACKALLOC:
ExprMap.erase(N);
SelectExpr(N);
return;
}
assert(0 && "Should not be reached!");
}
/// createPPC32PatternInstructionSelector - This pass converts an LLVM function
/// into a machine code representation using pattern matching and a machine
/// description file.
///
FunctionPass *llvm::createPPC64ISelPattern(TargetMachine &TM) {
return new ISel(TM);
}
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