#define DEBUG_TYPE "mips-lower"
#include "MipsISelLowering.h"
+#include "InstPrinter/MipsInstPrinter.h"
+#include "MCTargetDesc/MipsBaseInfo.h"
#include "MipsMachineFunction.h"
+#include "MipsSubtarget.h"
#include "MipsTargetMachine.h"
#include "MipsTargetObjectFile.h"
-#include "MipsSubtarget.h"
-#include "InstPrinter/MipsInstPrinter.h"
-#include "MCTargetDesc/MipsBaseInfo.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Function.h"
-#include "llvm/GlobalVariable.h"
-#include "llvm/Intrinsics.h"
-#include "llvm/CallingConv.h"
#include "llvm/ADT/Statistic.h"
+#include "llvm/CallingConv.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Function.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/Intrinsics.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
EnableMipsTailCalls("enable-mips-tail-calls", cl::Hidden,
cl::desc("MIPS: Enable tail calls."), cl::init(false));
+static cl::opt<bool>
+LargeGOT("mxgot", cl::Hidden,
+ cl::desc("MIPS: Enable GOT larger than 64k."), cl::init(false));
+
static const uint16_t O32IntRegs[4] = {
Mips::A0, Mips::A1, Mips::A2, Mips::A3
};
return DAG.getRegister(FI->getGlobalBaseReg(), Ty);
}
+static SDValue getTargetNode(SDValue Op, SelectionDAG &DAG, unsigned Flag) {
+ EVT Ty = Op.getValueType();
+
+ if (GlobalAddressSDNode *N = dyn_cast<GlobalAddressSDNode>(Op))
+ return DAG.getTargetGlobalAddress(N->getGlobal(), Op.getDebugLoc(), Ty, 0,
+ Flag);
+ if (ExternalSymbolSDNode *N = dyn_cast<ExternalSymbolSDNode>(Op))
+ return DAG.getTargetExternalSymbol(N->getSymbol(), Ty, Flag);
+ if (BlockAddressSDNode *N = dyn_cast<BlockAddressSDNode>(Op))
+ return DAG.getTargetBlockAddress(N->getBlockAddress(), Ty, 0, Flag);
+ if (JumpTableSDNode *N = dyn_cast<JumpTableSDNode>(Op))
+ return DAG.getTargetJumpTable(N->getIndex(), Ty, Flag);
+ if (ConstantPoolSDNode *N = dyn_cast<ConstantPoolSDNode>(Op))
+ return DAG.getTargetConstantPool(N->getConstVal(), Ty, N->getAlignment(),
+ N->getOffset(), Flag);
+
+ llvm_unreachable("Unexpected node type.");
+ return SDValue();
+}
+
+static SDValue getAddrNonPIC(SDValue Op, SelectionDAG &DAG) {
+ DebugLoc DL = Op.getDebugLoc();
+ EVT Ty = Op.getValueType();
+ SDValue Hi = getTargetNode(Op, DAG, MipsII::MO_ABS_HI);
+ SDValue Lo = getTargetNode(Op, DAG, MipsII::MO_ABS_LO);
+ return DAG.getNode(ISD::ADD, DL, Ty,
+ DAG.getNode(MipsISD::Hi, DL, Ty, Hi),
+ DAG.getNode(MipsISD::Lo, DL, Ty, Lo));
+}
+
+static SDValue getAddrLocal(SDValue Op, SelectionDAG &DAG, bool HasMips64) {
+ DebugLoc DL = Op.getDebugLoc();
+ EVT Ty = Op.getValueType();
+ unsigned GOTFlag = HasMips64 ? MipsII::MO_GOT_PAGE : MipsII::MO_GOT;
+ SDValue GOT = DAG.getNode(MipsISD::Wrapper, DL, Ty, GetGlobalReg(DAG, Ty),
+ getTargetNode(Op, DAG, GOTFlag));
+ SDValue Load = DAG.getLoad(Ty, DL, DAG.getEntryNode(), GOT,
+ MachinePointerInfo::getGOT(), false, false, false,
+ 0);
+ unsigned LoFlag = HasMips64 ? MipsII::MO_GOT_OFST : MipsII::MO_ABS_LO;
+ SDValue Lo = DAG.getNode(MipsISD::Lo, DL, Ty, getTargetNode(Op, DAG, LoFlag));
+ return DAG.getNode(ISD::ADD, DL, Ty, Load, Lo);
+}
+
+static SDValue getAddrGlobal(SDValue Op, SelectionDAG &DAG, unsigned Flag) {
+ DebugLoc DL = Op.getDebugLoc();
+ EVT Ty = Op.getValueType();
+ SDValue Tgt = DAG.getNode(MipsISD::Wrapper, DL, Ty, GetGlobalReg(DAG, Ty),
+ getTargetNode(Op, DAG, Flag));
+ return DAG.getLoad(Ty, DL, DAG.getEntryNode(), Tgt,
+ MachinePointerInfo::getGOT(), false, false, false, 0);
+}
+
+static SDValue getAddrGlobalLargeGOT(SDValue Op, SelectionDAG &DAG,
+ unsigned HiFlag, unsigned LoFlag) {
+ DebugLoc DL = Op.getDebugLoc();
+ EVT Ty = Op.getValueType();
+ SDValue Hi = DAG.getNode(MipsISD::Hi, DL, Ty, getTargetNode(Op, DAG, HiFlag));
+ Hi = DAG.getNode(ISD::ADD, DL, Ty, Hi, GetGlobalReg(DAG, Ty));
+ SDValue Wrapper = DAG.getNode(MipsISD::Wrapper, DL, Ty, Hi,
+ getTargetNode(Op, DAG, LoFlag));
+ return DAG.getLoad(Ty, DL, DAG.getEntryNode(), Wrapper,
+ MachinePointerInfo::getGOT(), false, false, false, 0);
+}
+
const char *MipsTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
case MipsISD::JmpLink: return "MipsISD::JmpLink";
case MipsISD::BuildPairF64: return "MipsISD::BuildPairF64";
case MipsISD::ExtractElementF64: return "MipsISD::ExtractElementF64";
case MipsISD::Wrapper: return "MipsISD::Wrapper";
- case MipsISD::DynAlloc: return "MipsISD::DynAlloc";
case MipsISD::Sync: return "MipsISD::Sync";
case MipsISD::Ext: return "MipsISD::Ext";
case MipsISD::Ins: return "MipsISD::Ins";
const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
if (getTargetMachine().getRelocationModel() != Reloc::PIC_ && !IsN64) {
- SDVTList VTs = DAG.getVTList(MVT::i32);
-
const MipsTargetObjectFile &TLOF =
(const MipsTargetObjectFile&)getObjFileLowering();
if (TLOF.IsGlobalInSmallSection(GV, getTargetMachine())) {
SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i32, 0,
MipsII::MO_GPREL);
- SDValue GPRelNode = DAG.getNode(MipsISD::GPRel, dl, VTs, &GA, 1);
+ SDValue GPRelNode = DAG.getNode(MipsISD::GPRel, dl,
+ DAG.getVTList(MVT::i32), &GA, 1);
SDValue GPReg = DAG.getRegister(Mips::GP, MVT::i32);
return DAG.getNode(ISD::ADD, dl, MVT::i32, GPReg, GPRelNode);
}
+
// %hi/%lo relocation
- SDValue GAHi = DAG.getTargetGlobalAddress(GV, dl, MVT::i32, 0,
- MipsII::MO_ABS_HI);
- SDValue GALo = DAG.getTargetGlobalAddress(GV, dl, MVT::i32, 0,
- MipsII::MO_ABS_LO);
- SDValue HiPart = DAG.getNode(MipsISD::Hi, dl, VTs, &GAHi, 1);
- SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, GALo);
- return DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
- }
-
- EVT ValTy = Op.getValueType();
- bool HasGotOfst = (GV->hasInternalLinkage() ||
- (GV->hasLocalLinkage() && !isa<Function>(GV)));
- unsigned GotFlag = HasMips64 ?
- (HasGotOfst ? MipsII::MO_GOT_PAGE : MipsII::MO_GOT_DISP) :
- (HasGotOfst ? MipsII::MO_GOT : MipsII::MO_GOT16);
- SDValue GA = DAG.getTargetGlobalAddress(GV, dl, ValTy, 0, GotFlag);
- GA = DAG.getNode(MipsISD::Wrapper, dl, ValTy, GetGlobalReg(DAG, ValTy), GA);
- SDValue ResNode = DAG.getLoad(ValTy, dl, DAG.getEntryNode(), GA,
- MachinePointerInfo(), false, false, false, 0);
- // On functions and global targets not internal linked only
- // a load from got/GP is necessary for PIC to work.
- if (!HasGotOfst)
- return ResNode;
- SDValue GALo = DAG.getTargetGlobalAddress(GV, dl, ValTy, 0,
- HasMips64 ? MipsII::MO_GOT_OFST :
- MipsII::MO_ABS_LO);
- SDValue Lo = DAG.getNode(MipsISD::Lo, dl, ValTy, GALo);
- return DAG.getNode(ISD::ADD, dl, ValTy, ResNode, Lo);
+ return getAddrNonPIC(Op, DAG);
+ }
+
+ if (GV->hasInternalLinkage() || (GV->hasLocalLinkage() && !isa<Function>(GV)))
+ return getAddrLocal(Op, DAG, HasMips64);
+
+ if (LargeGOT)
+ return getAddrGlobalLargeGOT(Op, DAG, MipsII::MO_GOT_HI16,
+ MipsII::MO_GOT_LO16);
+
+ return getAddrGlobal(Op, DAG,
+ HasMips64 ? MipsII::MO_GOT_DISP : MipsII::MO_GOT16);
}
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_ && !IsN64)
+ return getAddrNonPIC(Op, DAG);
- if (getTargetMachine().getRelocationModel() != Reloc::PIC_ && !IsN64) {
- // %hi/%lo relocation
- SDValue BAHi =
- DAG.getTargetBlockAddress(BA, MVT::i32, 0, MipsII::MO_ABS_HI);
- SDValue BALo =
- DAG.getTargetBlockAddress(BA, MVT::i32, 0, 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);
- }
-
- EVT ValTy = Op.getValueType();
- unsigned GOTFlag = HasMips64 ? MipsII::MO_GOT_PAGE : MipsII::MO_GOT;
- unsigned OFSTFlag = HasMips64 ? MipsII::MO_GOT_OFST : MipsII::MO_ABS_LO;
- SDValue BAGOTOffset = DAG.getTargetBlockAddress(BA, ValTy, 0, GOTFlag);
- BAGOTOffset = DAG.getNode(MipsISD::Wrapper, dl, ValTy,
- GetGlobalReg(DAG, ValTy), BAGOTOffset);
- SDValue BALOOffset = DAG.getTargetBlockAddress(BA, ValTy, 0, OFSTFlag);
- SDValue Load = DAG.getLoad(ValTy, dl, DAG.getEntryNode(), BAGOTOffset,
- MachinePointerInfo(), false, false, false, 0);
- SDValue Lo = DAG.getNode(MipsISD::Lo, dl, ValTy, BALOOffset);
- return DAG.getNode(ISD::ADD, dl, ValTy, Load, Lo);
+ return getAddrLocal(Op, DAG, HasMips64);
}
SDValue MipsTargetLowering::
SDValue MipsTargetLowering::
LowerJumpTable(SDValue Op, SelectionDAG &DAG) const
{
- SDValue HiPart, JTI, JTILo;
- // FIXME there isn't actually debug info here
- DebugLoc dl = Op.getDebugLoc();
- bool IsPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
- EVT PtrVT = Op.getValueType();
- JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
+ if (getTargetMachine().getRelocationModel() != Reloc::PIC_ && !IsN64)
+ return getAddrNonPIC(Op, DAG);
- if (!IsPIC && !IsN64) {
- JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MipsII::MO_ABS_HI);
- HiPart = DAG.getNode(MipsISD::Hi, dl, PtrVT, JTI);
- JTILo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MipsII::MO_ABS_LO);
- } else {// Emit Load from Global Pointer
- unsigned GOTFlag = HasMips64 ? MipsII::MO_GOT_PAGE : MipsII::MO_GOT;
- unsigned OfstFlag = HasMips64 ? MipsII::MO_GOT_OFST : MipsII::MO_ABS_LO;
- JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, GOTFlag);
- JTI = DAG.getNode(MipsISD::Wrapper, dl, PtrVT, GetGlobalReg(DAG, PtrVT),
- JTI);
- HiPart = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), JTI,
- MachinePointerInfo(), false, false, false, 0);
- JTILo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, OfstFlag);
- }
-
- SDValue Lo = DAG.getNode(MipsISD::Lo, dl, PtrVT, JTILo);
- return DAG.getNode(ISD::ADD, dl, PtrVT, HiPart, Lo);
+ return getAddrLocal(Op, DAG, HasMips64);
}
SDValue MipsTargetLowering::
LowerConstantPool(SDValue Op, SelectionDAG &DAG) const
{
- SDValue ResNode;
- ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
- const Constant *C = N->getConstVal();
- // FIXME there isn't actually debug info here
- DebugLoc dl = Op.getDebugLoc();
-
// gp_rel relocation
// FIXME: we should reference the constant pool using small data sections,
// but the asm printer currently doesn't support this feature without
// SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(MVT::i32);
// ResNode = DAG.getNode(ISD::ADD, MVT::i32, GOT, GPRelNode);
- if (getTargetMachine().getRelocationModel() != Reloc::PIC_ && !IsN64) {
- SDValue CPHi = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
- N->getOffset(), MipsII::MO_ABS_HI);
- SDValue CPLo = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment(),
- N->getOffset(), MipsII::MO_ABS_LO);
- SDValue HiPart = DAG.getNode(MipsISD::Hi, dl, MVT::i32, CPHi);
- SDValue Lo = DAG.getNode(MipsISD::Lo, dl, MVT::i32, CPLo);
- ResNode = DAG.getNode(ISD::ADD, dl, MVT::i32, HiPart, Lo);
- } else {
- EVT ValTy = Op.getValueType();
- unsigned GOTFlag = HasMips64 ? MipsII::MO_GOT_PAGE : MipsII::MO_GOT;
- unsigned OFSTFlag = HasMips64 ? MipsII::MO_GOT_OFST : MipsII::MO_ABS_LO;
- SDValue CP = DAG.getTargetConstantPool(C, ValTy, N->getAlignment(),
- N->getOffset(), GOTFlag);
- CP = DAG.getNode(MipsISD::Wrapper, dl, ValTy, GetGlobalReg(DAG, ValTy), CP);
- SDValue Load = DAG.getLoad(ValTy, dl, DAG.getEntryNode(), CP,
- MachinePointerInfo::getConstantPool(), false,
- false, false, 0);
- SDValue CPLo = DAG.getTargetConstantPool(C, ValTy, N->getAlignment(),
- N->getOffset(), OFSTFlag);
- SDValue Lo = DAG.getNode(MipsISD::Lo, dl, ValTy, CPLo);
- ResNode = DAG.getNode(ISD::ADD, dl, ValTy, Load, Lo);
- }
+ if (getTargetMachine().getRelocationModel() != Reloc::PIC_ && !IsN64)
+ return getAddrNonPIC(Op, DAG);
- return ResNode;
+ return getAddrLocal(Op, DAG, HasMips64);
}
SDValue MipsTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
// 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;
bool IsPICCall = (IsN64 || IsPIC); // true if calls are translated to jalr $25
bool GlobalOrExternal = false;
SDValue CalleeLo;
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
- if (IsPICCall && G->getGlobal()->hasInternalLinkage()) {
- OpFlag = IsO32 ? MipsII::MO_GOT : MipsII::MO_GOT_PAGE;
- unsigned char LoFlag = IsO32 ? MipsII::MO_ABS_LO : MipsII::MO_GOT_OFST;
+ if (IsPICCall) {
+ if (G->getGlobal()->hasInternalLinkage())
+ Callee = getAddrLocal(Callee, DAG, HasMips64);
+ else if (LargeGOT)
+ Callee = getAddrGlobalLargeGOT(Callee, DAG, MipsII::MO_CALL_HI16,
+ MipsII::MO_CALL_LO16);
+ else
+ Callee = getAddrGlobal(Callee, DAG, MipsII::MO_GOT_CALL);
+ } else
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, getPointerTy(), 0,
- OpFlag);
- CalleeLo = DAG.getTargetGlobalAddress(G->getGlobal(), dl, getPointerTy(),
- 0, LoFlag);
- } else {
- OpFlag = IsPICCall ? MipsII::MO_GOT_CALL : MipsII::MO_NO_FLAG;
- Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
- getPointerTy(), 0, OpFlag);
- }
-
+ MipsII::MO_NO_FLAG);
GlobalOrExternal = true;
}
else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
- if (IsN64 || (!IsO32 && IsPIC))
- OpFlag = MipsII::MO_GOT_DISP;
- else if (!IsPIC) // !N64 && static
- OpFlag = MipsII::MO_NO_FLAG;
+ if (!IsN64 && !IsPIC) // !N64 && static
+ Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy(),
+ MipsII::MO_NO_FLAG);
+ else if (LargeGOT)
+ Callee = getAddrGlobalLargeGOT(Callee, DAG, MipsII::MO_CALL_HI16,
+ MipsII::MO_CALL_LO16);
+ else if (HasMips64)
+ Callee = getAddrGlobal(Callee, DAG, MipsII::MO_GOT_DISP);
else // O32 & PIC
- OpFlag = MipsII::MO_GOT_CALL;
- Callee = DAG.getTargetExternalSymbol(S->getSymbol(), getPointerTy(),
- OpFlag);
+ Callee = getAddrGlobal(Callee, DAG, MipsII::MO_GOT_CALL);
+
GlobalOrExternal = true;
}
SDValue InFlag;
- // Create nodes that load address of callee and copy it to T9
- if (IsPICCall) {
- if (GlobalOrExternal) {
- // Load callee address
- Callee = DAG.getNode(MipsISD::Wrapper, dl, getPointerTy(),
- GetGlobalReg(DAG, getPointerTy()), Callee);
- SDValue LoadValue = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
- Callee, MachinePointerInfo::getGOT(),
- false, false, false, 0);
-
- // Use GOT+LO if callee has internal linkage.
- if (CalleeLo.getNode()) {
- SDValue Lo = DAG.getNode(MipsISD::Lo, dl, getPointerTy(), CalleeLo);
- Callee = DAG.getNode(ISD::ADD, dl, getPointerTy(), LoadValue, Lo);
- } else
- Callee = LoadValue;
- }
- }
-
// T9 register operand.
SDValue T9;
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