//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mips-lower"
+//#include <algorithm>
#include "MipsISelLowering.h"
#include "MipsMachineFunction.h"
#include "MipsTargetMachine.h"
const char *MipsTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
- case MipsISD::JmpLink : return "MipsISD::JmpLink";
- case MipsISD::Hi : return "MipsISD::Hi";
- case MipsISD::Lo : return "MipsISD::Lo";
- case MipsISD::GPRel : return "MipsISD::GPRel";
- case MipsISD::Ret : return "MipsISD::Ret";
- case MipsISD::FPBrcond : return "MipsISD::FPBrcond";
- case MipsISD::FPCmp : return "MipsISD::FPCmp";
- case MipsISD::CMovFP_T : return "MipsISD::CMovFP_T";
- case MipsISD::CMovFP_F : return "MipsISD::CMovFP_F";
- case MipsISD::FPRound : return "MipsISD::FPRound";
- case MipsISD::MAdd : return "MipsISD::MAdd";
- case MipsISD::MAddu : return "MipsISD::MAddu";
- case MipsISD::MSub : return "MipsISD::MSub";
- case MipsISD::MSubu : return "MipsISD::MSubu";
- case MipsISD::DivRem : return "MipsISD::DivRem";
- case MipsISD::DivRemU : return "MipsISD::DivRemU";
- default : return NULL;
+ case MipsISD::JmpLink: return "MipsISD::JmpLink";
+ case MipsISD::Hi: return "MipsISD::Hi";
+ case MipsISD::Lo: return "MipsISD::Lo";
+ case MipsISD::GPRel: return "MipsISD::GPRel";
+ case MipsISD::Ret: return "MipsISD::Ret";
+ case MipsISD::FPBrcond: return "MipsISD::FPBrcond";
+ case MipsISD::FPCmp: return "MipsISD::FPCmp";
+ case MipsISD::CMovFP_T: return "MipsISD::CMovFP_T";
+ case MipsISD::CMovFP_F: return "MipsISD::CMovFP_F";
+ case MipsISD::FPRound: return "MipsISD::FPRound";
+ case MipsISD::MAdd: return "MipsISD::MAdd";
+ case MipsISD::MAddu: return "MipsISD::MAddu";
+ case MipsISD::MSub: return "MipsISD::MSub";
+ case MipsISD::MSubu: return "MipsISD::MSubu";
+ case MipsISD::DivRem: return "MipsISD::DivRem";
+ case MipsISD::DivRemU: return "MipsISD::DivRemU";
+ case MipsISD::BuildPairF64: return "MipsISD::BuildPairF64";
+ case MipsISD::ExtractElementF64: return "MipsISD::ExtractElementF64";
+ default: return NULL;
}
}
setOperationAction(ISD::FCOS, MVT::f64, Expand);
setOperationAction(ISD::FPOWI, MVT::f32, Expand);
setOperationAction(ISD::FPOW, MVT::f32, Expand);
+ setOperationAction(ISD::FPOW, MVT::f64, Expand);
setOperationAction(ISD::FLOG, MVT::f32, Expand);
setOperationAction(ISD::FLOG2, MVT::f32, Expand);
setOperationAction(ISD::FLOG10, MVT::f32, Expand);
setTargetDAGCombine(ISD::UDIVREM);
setTargetDAGCombine(ISD::SETCC);
+ setMinFunctionAlignment(2);
+
setStackPointerRegisterToSaveRestore(Mips::SP);
computeRegisterProperties();
}
return MVT::i32;
}
-/// getFunctionAlignment - Return the Log2 alignment of this function.
-unsigned MipsTargetLowering::getFunctionAlignment(const Function *) const {
- return 2;
-}
-
// SelectMadd -
// Transforms a subgraph in CurDAG if the following pattern is found:
// (addc multLo, Lo0), (adde multHi, Hi0),
// insert MFHI
if (N->hasAnyUseOfValue(1)) {
SDValue CopyFromHi = DAG.getCopyFromReg(InChain, dl,
- Mips::HI, MVT::i32, InGlue);
+ Mips::HI, MVT::i32, InGlue);
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 1), CopyFromHi);
}
SDValue RHS = Op.getOperand(1);
DebugLoc dl = Op.getDebugLoc();
- // Assume the 3rd operand is a CondCodeSDNode. Add code to check the type of node
- // if necessary.
+ // Assume the 3rd operand is a CondCodeSDNode. Add code to check the type of
+ // node if necessary.
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
return DAG.getNode(MipsISD::FPCmp, dl, MVT::Glue, LHS, RHS,
SDValue CondRes = CreateFPCmp(DAG, Op.getOperand(1));
- // Return if flag is not set by a floating point comparision.
+ // Return if flag is not set by a floating point comparison.
if (CondRes.getOpcode() != MipsISD::FPCmp)
return Op;
{
SDValue Cond = CreateFPCmp(DAG, Op.getOperand(0));
- // Return if flag is not set by a floating point comparision.
+ // Return if flag is not set by a floating point comparison.
if (Cond.getOpcode() != MipsISD::FPCmp)
return Op;
false, false, 0);
// On functions and global targets not internal linked only
// a load from got/GP is necessary for PIC to work.
- if (!GV->hasLocalLinkage() || isa<Function>(GV))
+ if (!GV->hasInternalLinkage() &&
+ (!GV->hasLocalLinkage() || isa<Function>(GV)))
return ResNode;
SDValue GALo = DAG.getTargetGlobalAddress(GV, dl, MVT::i32, 0,
MipsII::MO_ABS_LO);
SDValue MipsTargetLowering::LowerBlockAddress(SDValue Op,
SelectionDAG &DAG) const {
+ const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
+ // FIXME there isn't actually debug info here
+ DebugLoc dl = Op.getDebugLoc();
+
if (getTargetMachine().getRelocationModel() != Reloc::PIC_) {
- assert(false && "implement LowerBlockAddress for -static");
- return SDValue(0, 0);
- }
- else {
- // FIXME there isn't actually debug info here
- DebugLoc dl = Op.getDebugLoc();
- const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
- SDValue BAGOTOffset = DAG.getBlockAddress(BA, MVT::i32, true,
- MipsII::MO_GOT);
- SDValue BALOOffset = DAG.getBlockAddress(BA, MVT::i32, true,
- MipsII::MO_ABS_LO);
- SDValue Load = DAG.getLoad(MVT::i32, dl,
- DAG.getEntryNode(), BAGOTOffset,
- MachinePointerInfo(), false, false, 0);
- SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, BALOOffset);
- return DAG.getNode(ISD::ADD, dl, MVT::i32, Load, Lo);
+ // %hi/%lo relocation
+ SDValue BAHi = DAG.getBlockAddress(BA, MVT::i32, true,
+ MipsII::MO_ABS_HI);
+ SDValue BALo = DAG.getBlockAddress(BA, MVT::i32, true,
+ MipsII::MO_ABS_LO);
+ SDValue Hi = DAG.getNode(MipsISD::Hi, dl, MVT::i32, BAHi);
+ SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, BALo);
+ return DAG.getNode(ISD::ADD, dl, MVT::i32, Hi, Lo);
}
+
+ SDValue BAGOTOffset = DAG.getBlockAddress(BA, MVT::i32, true,
+ MipsII::MO_GOT);
+ SDValue BALOOffset = DAG.getBlockAddress(BA, MVT::i32, true,
+ MipsII::MO_ABS_LO);
+ SDValue Load = DAG.getLoad(MVT::i32, dl,
+ DAG.getEntryNode(), BAGOTOffset,
+ MachinePointerInfo(), false, false, 0);
+ SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, BALOOffset);
+ return DAG.getNode(ISD::ADD, dl, MVT::i32, Load, Lo);
}
SDValue MipsTargetLowering::
MachinePointerInfo(),
false, false, 0);
- SDValue JTILo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MipsII::MO_ABS_LO);
+ SDValue JTILo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT,
+ MipsII::MO_ABS_LO);
SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, JTILo);
ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
// gp_rel relocation
// FIXME: we should reference the constant pool using small data sections,
- // but the asm printer currently doens't support this feature without
+ // but the asm printer currently doesn't support this feature without
// hacking it. This feature should come soon so we can uncomment the
// stuff below.
//if (IsInSmallSection(C->getType())) {
// yet to hold an argument. Otherwise, use A2, A3 and stack. If A1 is
// not used, it must be shadowed. If only A3 is avaiable, shadow it and
// go to stack.
+//
+// For vararg functions, all arguments are passed in A0, A1, A2, A3 and stack.
//===----------------------------------------------------------------------===//
static bool CC_MipsO32(unsigned ValNo, MVT ValVT,
Mips::D6, Mips::D7
};
- unsigned Reg = 0;
- static bool IntRegUsed = false;
-
- // This must be the first arg of the call if no regs have been allocated.
- // Initialize IntRegUsed in that case.
- if (IntRegs[State.getFirstUnallocated(IntRegs, IntRegsSize)] == Mips::A0 &&
- F32Regs[State.getFirstUnallocated(F32Regs, FloatRegsSize)] == Mips::F12 &&
- F64Regs[State.getFirstUnallocated(F64Regs, FloatRegsSize)] == Mips::D6)
- IntRegUsed = false;
-
- // Promote i8 and i16
- if (LocVT == MVT::i8 || LocVT == MVT::i16) {
- LocVT = MVT::i32;
- if (ArgFlags.isSExt())
- LocInfo = CCValAssign::SExt;
- else if (ArgFlags.isZExt())
- LocInfo = CCValAssign::ZExt;
- else
- LocInfo = CCValAssign::AExt;
- }
-
- if (ValVT == MVT::i32) {
- Reg = State.AllocateReg(IntRegs, IntRegsSize);
- IntRegUsed = true;
- } else if (ValVT == MVT::f32) {
- // An int reg has to be marked allocated regardless of whether or not
- // IntRegUsed is true.
- Reg = State.AllocateReg(IntRegs, IntRegsSize);
-
- if (IntRegUsed) {
- if (Reg) // Int reg is available
- LocVT = MVT::i32;
- } else {
- unsigned FReg = State.AllocateReg(F32Regs, FloatRegsSize);
- if (FReg) // F32 reg is available
- Reg = FReg;
- else if (Reg) // No F32 regs are available, but an int reg is available.
- LocVT = MVT::i32;
- }
- } else if (ValVT == MVT::f64) {
- // Int regs have to be marked allocated regardless of whether or not
- // IntRegUsed is true.
- Reg = State.AllocateReg(IntRegs, IntRegsSize);
- if (Reg == Mips::A1)
- Reg = State.AllocateReg(IntRegs, IntRegsSize);
- else if (Reg == Mips::A3)
- Reg = 0;
- State.AllocateReg(IntRegs, IntRegsSize);
-
- // At this point, Reg is A0, A2 or 0, and all the unavailable integer regs
- // are marked as allocated.
- if (IntRegUsed) {
- if (Reg)// if int reg is available
- LocVT = MVT::i32;
- } else {
- unsigned FReg = State.AllocateReg(F64Regs, FloatRegsSize);
- if (FReg) // F64 reg is available.
- Reg = FReg;
- else if (Reg) // No F64 regs are available, but an int reg is available.
- LocVT = MVT::i32;
- }
- } else
- assert(false && "cannot handle this ValVT");
-
- if (!Reg) {
- unsigned SizeInBytes = ValVT.getSizeInBits() >> 3;
- unsigned Offset = State.AllocateStack(SizeInBytes, SizeInBytes);
- State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
- } else
- State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
-
- return false; // CC must always match
-}
-
-static bool CC_MipsO32_VarArgs(unsigned ValNo, MVT ValVT,
- MVT LocVT, CCValAssign::LocInfo LocInfo,
- ISD::ArgFlagsTy ArgFlags, CCState &State) {
-
- static const unsigned IntRegsSize=4;
-
- static const unsigned IntRegs[] = {
- Mips::A0, Mips::A1, Mips::A2, Mips::A3
- };
-
// Promote i8 and i16
if (LocVT == MVT::i8 || LocVT == MVT::i16) {
LocVT = MVT::i32;
unsigned Reg;
- if (ValVT == MVT::i32 || ValVT == MVT::f32) {
+ // f32 and f64 are allocated in A0, A1, A2, A3 when either of the following
+ // is true: function is vararg, argument is 3rd or higher, there is previous
+ // argument which is not f32 or f64.
+ bool AllocateFloatsInIntReg = State.isVarArg() || ValNo > 1
+ || State.getFirstUnallocated(F32Regs, FloatRegsSize) != ValNo;
+ unsigned OrigAlign = ArgFlags.getOrigAlign();
+ bool isI64 = (ValVT == MVT::i32 && OrigAlign == 8);
+
+ if (ValVT == MVT::i32 || (ValVT == MVT::f32 && AllocateFloatsInIntReg)) {
Reg = State.AllocateReg(IntRegs, IntRegsSize);
+ // If this is the first part of an i64 arg,
+ // the allocated register must be either A0 or A2.
+ if (isI64 && (Reg == Mips::A1 || Reg == Mips::A3))
+ Reg = State.AllocateReg(IntRegs, IntRegsSize);
LocVT = MVT::i32;
- } else if (ValVT == MVT::f64) {
+ } else if (ValVT == MVT::f64 && AllocateFloatsInIntReg) {
+ // Allocate int register and shadow next int register. If first
+ // available register is Mips::A1 or Mips::A3, shadow it too.
Reg = State.AllocateReg(IntRegs, IntRegsSize);
if (Reg == Mips::A1 || Reg == Mips::A3)
Reg = State.AllocateReg(IntRegs, IntRegsSize);
State.AllocateReg(IntRegs, IntRegsSize);
LocVT = MVT::i32;
+ } else if (ValVT.isFloatingPoint() && !AllocateFloatsInIntReg) {
+ // we are guaranteed to find an available float register
+ if (ValVT == MVT::f32) {
+ Reg = State.AllocateReg(F32Regs, FloatRegsSize);
+ // Shadow int register
+ State.AllocateReg(IntRegs, IntRegsSize);
+ } else {
+ Reg = State.AllocateReg(F64Regs, FloatRegsSize);
+ // Shadow int registers
+ unsigned Reg2 = State.AllocateReg(IntRegs, IntRegsSize);
+ if (Reg2 == Mips::A1 || Reg2 == Mips::A3)
+ State.AllocateReg(IntRegs, IntRegsSize);
+ State.AllocateReg(IntRegs, IntRegsSize);
+ }
} else
llvm_unreachable("Cannot handle this ValVT.");
- if (!Reg) {
- unsigned SizeInBytes = ValVT.getSizeInBits() >> 3;
- unsigned Offset = State.AllocateStack(SizeInBytes, SizeInBytes);
+ unsigned SizeInBytes = ValVT.getSizeInBits() >> 3;
+ unsigned Offset = State.AllocateStack(SizeInBytes, OrigAlign);
+
+ if (!Reg)
State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
- } else
+ else
State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
return false; // CC must always match
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
+ const TargetFrameLowering *TFL = MF.getTarget().getFrameLowering();
bool IsPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
+ MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
// Analyze operands of the call, assigning locations to each operand.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
*DAG.getContext());
- // To meet O32 ABI, Mips must always allocate 16 bytes on
- // the stack (even if less than 4 are used as arguments)
- if (Subtarget->isABI_O32()) {
- int VTsize = MVT(MVT::i32).getSizeInBits()/8;
- MFI->CreateFixedObject(VTsize, (VTsize*3), true);
- CCInfo.AnalyzeCallOperands(Outs,
- isVarArg ? CC_MipsO32_VarArgs : CC_MipsO32);
- } else
+ if (Subtarget->isABI_O32())
+ CCInfo.AnalyzeCallOperands(Outs, CC_MipsO32);
+ else
CCInfo.AnalyzeCallOperands(Outs, CC_Mips);
// Get a count of how many bytes are to be pushed on the stack.
SmallVector<std::pair<unsigned, SDValue>, 16> RegsToPass;
SmallVector<SDValue, 8> MemOpChains;
- // First/LastArgStackLoc contains the first/last
- // "at stack" argument location.
- int LastArgStackLoc = 0;
- unsigned FirstStackArgLoc = (Subtarget->isABI_EABI() ? 0 : 16);
+ MipsFI->setHasCall();
+
+ // Create GP frame object if this is the first call.
+ // SPOffset will be updated after call frame size is known.
+ if (IsPIC && !MipsFI->getGPFI())
+ MipsFI->setGPFI(MFI->CreateFixedObject(4, 0, true));
+
+ int FirstFI = -MFI->getNumFixedObjects() - 1, LastFI = 0;
// Walk the register/memloc assignments, inserting copies/loads.
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
if (VA.getValVT() == MVT::f32 && VA.getLocVT() == MVT::i32)
Arg = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Arg);
if (VA.getValVT() == MVT::f64 && VA.getLocVT() == MVT::i32) {
- Arg = DAG.getNode(ISD::BITCAST, dl, MVT::i64, Arg);
- SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
- DAG.getConstant(0, getPointerTy()));
- SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Arg,
- DAG.getConstant(1, getPointerTy()));
+ SDValue Lo = DAG.getNode(MipsISD::ExtractElementF64, dl, MVT::i32,
+ Arg, DAG.getConstant(0, MVT::i32));
+ SDValue Hi = DAG.getNode(MipsISD::ExtractElementF64, dl, MVT::i32,
+ Arg, DAG.getConstant(1, MVT::i32));
+ if (!Subtarget->isLittle())
+ std::swap(Lo, Hi);
RegsToPass.push_back(std::make_pair(VA.getLocReg(), Lo));
RegsToPass.push_back(std::make_pair(VA.getLocReg()+1, Hi));
continue;
// This guarantees that when allocating Local Area the firsts
// 16 bytes which are alwayes reserved won't be overwritten
// if O32 ABI is used. For EABI the first address is zero.
- LastArgStackLoc = (FirstStackArgLoc + VA.getLocMemOffset());
- int FI = MFI->CreateFixedObject(VA.getValVT().getSizeInBits()/8,
- LastArgStackLoc, true);
-
- SDValue PtrOff = DAG.getFrameIndex(FI,getPointerTy());
+ LastFI = MFI->CreateFixedObject(VA.getValVT().getSizeInBits()/8,
+ VA.getLocMemOffset(), true);
+ SDValue PtrOff = DAG.getFrameIndex(LastFI, getPointerTy());
// emit ISD::STORE whichs stores the
// parameter value to a stack Location
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOpChains[0], MemOpChains.size());
+ // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
+ // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
+ // node so that legalize doesn't hack it.
+ unsigned char OpFlag = IsPIC ? MipsII::MO_GOT_CALL : MipsII::MO_NO_FLAG;
+ bool LoadSymAddr = false;
+ SDValue CalleeLo;
+
+ if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
+ if (IsPIC && G->getGlobal()->hasInternalLinkage()) {
+ Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
+ getPointerTy(), 0,MipsII:: MO_GOT);
+ CalleeLo = DAG.getTargetGlobalAddress(G->getGlobal(), dl, getPointerTy(),
+ 0, MipsII::MO_ABS_LO);
+ } else {
+ Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
+ getPointerTy(), 0, OpFlag);
+ }
+
+ LoadSymAddr = true;
+ }
+ else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
+ Callee = DAG.getTargetExternalSymbol(S->getSymbol(),
+ getPointerTy(), OpFlag);
+ LoadSymAddr = true;
+ }
+
+ SDValue InFlag;
+
+ // Create nodes that load address of callee and copy it to T9
+ if (IsPIC) {
+ if (LoadSymAddr) {
+ // Load callee address
+ SDValue LoadValue = DAG.getLoad(MVT::i32, dl, Chain, Callee,
+ MachinePointerInfo::getGOT(),
+ false, false, 0);
+
+ // Use GOT+LO if callee has internal linkage.
+ if (CalleeLo.getNode()) {
+ SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, CalleeLo);
+ Callee = DAG.getNode(ISD::ADD, dl, MVT::i32, LoadValue, Lo);
+ } else
+ Callee = LoadValue;
+
+ // Use chain output from LoadValue
+ Chain = LoadValue.getValue(1);
+ }
+
+ // copy to T9
+ Chain = DAG.getCopyToReg(Chain, dl, Mips::T9, Callee, SDValue(0, 0));
+ InFlag = Chain.getValue(1);
+ Callee = DAG.getRegister(Mips::T9, MVT::i32);
+ }
+
// Build a sequence of copy-to-reg nodes chained together with token
// chain and flag operands which copy the outgoing args into registers.
- // The InFlag in necessary since all emited instructions must be
+ // The InFlag in necessary since all emitted instructions must be
// stuck together.
- SDValue InFlag;
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
RegsToPass[i].second, InFlag);
InFlag = Chain.getValue(1);
}
- // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
- // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
- // node so that legalize doesn't hack it.
- unsigned char OpFlag = IsPIC ? MipsII::MO_GOT_CALL : MipsII::MO_NO_FLAG;
- if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
- Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
- getPointerTy(), 0, OpFlag);
- else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee))
- Callee = DAG.getTargetExternalSymbol(S->getSymbol(),
- getPointerTy(), OpFlag);
-
// MipsJmpLink = #chain, #target_address, #opt_in_flags...
// = Chain, Callee, Reg#1, Reg#2, ...
//
// Create a stack location to hold GP when PIC is used. This stack
// location is used on function prologue to save GP and also after all
- // emited CALL's to restore GP.
+ // emitted CALL's to restore GP.
if (IsPIC) {
- // Function can have an arbitrary number of calls, so
- // hold the LastArgStackLoc with the biggest offset.
- int FI;
- MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
- if (LastArgStackLoc >= MipsFI->getGPStackOffset()) {
- LastArgStackLoc = (!LastArgStackLoc) ? (16) : (LastArgStackLoc+4);
- // Create the frame index only once. SPOffset here can be anything
- // (this will be fixed on processFunctionBeforeFrameFinalized)
- if (MipsFI->getGPStackOffset() == -1) {
- FI = MFI->CreateFixedObject(4, 0, true);
- MipsFI->setGPFI(FI);
- }
- MipsFI->setGPStackOffset(LastArgStackLoc);
- }
-
- // Reload GP value.
- FI = MipsFI->getGPFI();
- SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
- SDValue GPLoad = DAG.getLoad(MVT::i32, dl, Chain, FIN,
- MachinePointerInfo::getFixedStack(FI),
- false, false, 0);
- Chain = GPLoad.getValue(1);
- Chain = DAG.getCopyToReg(Chain, dl, DAG.getRegister(Mips::GP, MVT::i32),
- GPLoad, SDValue(0,0));
- InFlag = Chain.getValue(1);
+ // Function can have an arbitrary number of calls, so
+ // hold the LastArgStackLoc with the biggest offset.
+ int MaxCallFrameSize = MipsFI->getMaxCallFrameSize();
+ unsigned NextStackOffset = CCInfo.getNextStackOffset();
+
+ // For O32, a minimum of four words (16 bytes) of argument space is
+ // allocated.
+ if (Subtarget->isABI_O32())
+ NextStackOffset = std::max(NextStackOffset, (unsigned)16);
+
+ if (MaxCallFrameSize < (int)NextStackOffset) {
+ MipsFI->setMaxCallFrameSize(NextStackOffset);
+
+ // $gp restore slot must be aligned.
+ unsigned StackAlignment = TFL->getStackAlignment();
+ NextStackOffset = (NextStackOffset + StackAlignment - 1) /
+ StackAlignment * StackAlignment;
+ int GPFI = MipsFI->getGPFI();
+ MFI->setObjectOffset(GPFI, NextStackOffset);
+ }
}
+ // Extend range of indices of frame objects for outgoing arguments that were
+ // created during this function call. Skip this step if no such objects were
+ // created.
+ if (LastFI)
+ MipsFI->extendOutArgFIRange(FirstFI, LastFI);
+
// Create the CALLSEQ_END node.
Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
DAG.getIntPtrConstant(0, true), InFlag);
/// and generate load operations for arguments places on the stack.
SDValue
MipsTargetLowering::LowerFormalArguments(SDValue Chain,
- CallingConv::ID CallConv, bool isVarArg,
- const SmallVectorImpl<ISD::InputArg>
- &Ins,
- DebugLoc dl, SelectionDAG &DAG,
- SmallVectorImpl<SDValue> &InVals)
+ CallingConv::ID CallConv,
+ bool isVarArg,
+ const SmallVectorImpl<ISD::InputArg>
+ &Ins,
+ DebugLoc dl, SelectionDAG &DAG,
+ SmallVectorImpl<SDValue> &InVals)
const {
MachineFunction &MF = DAG.getMachineFunction();
// Used with vargs to acumulate store chains.
std::vector<SDValue> OutChains;
- // Keep track of the last register used for arguments
- unsigned ArgRegEnd = 0;
-
// Assign locations to all of the incoming arguments.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
ArgLocs, *DAG.getContext());
if (Subtarget->isABI_O32())
- CCInfo.AnalyzeFormalArguments(Ins,
- isVarArg ? CC_MipsO32_VarArgs : CC_MipsO32);
+ CCInfo.AnalyzeFormalArguments(Ins, CC_MipsO32);
else
CCInfo.AnalyzeFormalArguments(Ins, CC_Mips);
- unsigned FirstStackArgLoc = (Subtarget->isABI_EABI() ? 0 : 16);
- unsigned LastStackArgEndOffset = 0;
- EVT LastRegArgValVT;
+ int LastFI = 0;// MipsFI->LastInArgFI is 0 at the entry of this function.
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
// Arguments stored on registers
if (VA.isRegLoc()) {
EVT RegVT = VA.getLocVT();
- ArgRegEnd = VA.getLocReg();
- LastRegArgValVT = VA.getValVT();
+ unsigned ArgReg = VA.getLocReg();
TargetRegisterClass *RC = 0;
if (RegVT == MVT::i32)
// Transform the arguments stored on
// physical registers into virtual ones
- unsigned Reg = AddLiveIn(DAG.getMachineFunction(), ArgRegEnd, RC);
+ unsigned Reg = AddLiveIn(DAG.getMachineFunction(), ArgReg, RC);
SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
// If this is an 8 or 16-bit value, it has been passed promoted
unsigned Reg2 = AddLiveIn(DAG.getMachineFunction(),
VA.getLocReg()+1, RC);
SDValue ArgValue2 = DAG.getCopyFromReg(Chain, dl, Reg2, RegVT);
- SDValue Pair = DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, ArgValue,
- ArgValue2);
- ArgValue = DAG.getNode(ISD::BITCAST, dl, MVT::f64, Pair);
+ if (!Subtarget->isLittle())
+ std::swap(ArgValue, ArgValue2);
+ ArgValue = DAG.getNode(MipsISD::BuildPairF64, dl, MVT::f64,
+ ArgValue, ArgValue2);
}
}
// sanity check
assert(VA.isMemLoc());
- // The last argument is not a register anymore
- ArgRegEnd = 0;
-
// The stack pointer offset is relative to the caller stack frame.
// Since the real stack size is unknown here, a negative SPOffset
// is used so there's a way to adjust these offsets when the stack
// used instead of a direct negative address (which is recorded to
// be used on emitPrologue) to avoid mis-calc of the first stack
// offset on PEI::calculateFrameObjectOffsets.
- unsigned ArgSize = VA.getValVT().getSizeInBits()/8;
- LastStackArgEndOffset = FirstStackArgLoc + VA.getLocMemOffset() + ArgSize;
- int FI = MFI->CreateFixedObject(ArgSize, 0, true);
- MipsFI->recordLoadArgsFI(FI, -(4 +
- (FirstStackArgLoc + VA.getLocMemOffset())));
+ LastFI = MFI->CreateFixedObject(VA.getValVT().getSizeInBits()/8,
+ VA.getLocMemOffset(), true);
// Create load nodes to retrieve arguments from the stack
- SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
+ SDValue FIN = DAG.getFrameIndex(LastFI, getPointerTy());
InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
- MachinePointerInfo::getFixedStack(FI),
+ MachinePointerInfo::getFixedStack(LastFI),
false, false, 0));
}
}
// must have their values written to the caller stack frame. If the last
// argument was placed in the stack, there's no need to save any register.
if (isVarArg && Subtarget->isABI_O32()) {
- if (ArgRegEnd) {
- // Last named formal argument is passed in register.
+ // Record the frame index of the first variable argument
+ // which is a value necessary to VASTART.
+ unsigned NextStackOffset = CCInfo.getNextStackOffset();
+ LastFI = MFI->CreateFixedObject(4, NextStackOffset, true);
+ MipsFI->setVarArgsFrameIndex(LastFI);
+
+ const unsigned O32IntRegs[] = {
+ Mips::A0, Mips::A1, Mips::A2, Mips::A3
+ };
- // The last register argument that must be saved is Mips::A3
+ // Copy variable arguments passed in registers to stack.
+ for (; NextStackOffset < 16; NextStackOffset += 4) {
TargetRegisterClass *RC = Mips::CPURegsRegisterClass;
- if (LastRegArgValVT == MVT::f64)
- ArgRegEnd++;
-
- if (ArgRegEnd < Mips::A3) {
- // Both the last named formal argument and the first variable
- // argument are passed in registers.
- for (++ArgRegEnd; ArgRegEnd <= Mips::A3; ++ArgRegEnd) {
- unsigned Reg = AddLiveIn(DAG.getMachineFunction(), ArgRegEnd, RC);
- SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, MVT::i32);
-
- int FI = MFI->CreateFixedObject(4, 0, true);
- MipsFI->recordStoreVarArgsFI(FI, -(4+(ArgRegEnd-Mips::A0)*4));
- SDValue PtrOff = DAG.getFrameIndex(FI, getPointerTy());
- OutChains.push_back(DAG.getStore(Chain, dl, ArgValue, PtrOff,
- MachinePointerInfo(),
- false, false, 0));
-
- // Record the frame index of the first variable argument
- // which is a value necessary to VASTART.
- if (!MipsFI->getVarArgsFrameIndex()) {
- MFI->setObjectAlignment(FI, 4);
- MipsFI->setVarArgsFrameIndex(FI);
- }
- }
- } else {
- // Last named formal argument is in register Mips::A3, and the first
- // variable argument is on stack. Record the frame index of the first
- // variable argument.
- int FI = MFI->CreateFixedObject(4, 0, true);
- MFI->setObjectAlignment(FI, 4);
- MipsFI->recordStoreVarArgsFI(FI, -20);
- MipsFI->setVarArgsFrameIndex(FI);
- }
- } else {
- // Last named formal argument and all the variable arguments are passed
- // on stack. Record the frame index of the first variable argument.
- int FI = MFI->CreateFixedObject(4, 0, true);
- MFI->setObjectAlignment(FI, 4);
- MipsFI->recordStoreVarArgsFI(FI, -(4+LastStackArgEndOffset));
- MipsFI->setVarArgsFrameIndex(FI);
+ unsigned Idx = NextStackOffset / 4;
+ unsigned Reg = AddLiveIn(DAG.getMachineFunction(), O32IntRegs[Idx], RC);
+ SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, MVT::i32);
+ LastFI = MFI->CreateFixedObject(4, NextStackOffset, true);
+ SDValue PtrOff = DAG.getFrameIndex(LastFI, getPointerTy());
+ OutChains.push_back(DAG.getStore(Chain, dl, ArgValue, PtrOff,
+ MachinePointerInfo(),
+ false, false, 0));
}
}
+ MipsFI->setLastInArgFI(LastFI);
+
// All stores are grouped in one node to allow the matching between
// the size of Ins and InVals. This only happens when on varg functions
if (!OutChains.empty()) {
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