static void createFPFnStub(Function *F, Module *M, FPParamVariant PV,
const MipsTargetMachine &TM) {
bool PicMode = TM.isPositionIndependent();
bool LE = TM.isLittleEndian();
LLVMContext &Context = M->getContext();
std::string Name = F->getName();
std::string SectionName = ".mips16.fn." + Name;
std::string StubName = "__fn_stub_" + Name;
std::string LocalName = "$$__fn_local_" + Name;
Function *FStub = Function::Create
(F->getFunctionType(),
Function::InternalLinkage, StubName, M);
FStub->addFnAttr("mips16_fp_stub");
FStub->addFnAttr(llvm::Attribute::Naked);
FStub->addFnAttr(llvm::Attribute::NoUnwind);
FStub->addFnAttr(llvm::Attribute::NoInline);
FStub->addFnAttr("nomips16");
FStub->setSection(SectionName);
BasicBlock *BB = BasicBlock::Create(Context, "entry", FStub);
std::string AsmText;
if (PicMode) {
AsmText += ".set noreorder\n";
AsmText += ".cpload $$25\n";
AsmText += ".set reorder\n";
AsmText += ".reloc 0, R_MIPS_NONE, " + Name + "\n";
AsmText += "la $$25, " + LocalName + "\n";
} else
AsmText += "la $$25, " + Name + "\n";
AsmText += swapFPIntParams(PV, M, LE, false);
AsmText += "jr $$25\n";
AsmText += LocalName + " = " + Name + "\n";
EmitInlineAsm(Context, BB, AsmText);
new UnreachableInst(FStub->getContext(), BB);
}
//
// Make sure that we know we already need a stub for this function.
// Having called needsFPHelperFromSig
//
static void assureFPCallStub(Function &F, Module *M,
const MipsTargetMachine &TM) {
// for now we only need them for static relocation
if (TM.isPositionIndependent())
return;
LLVMContext &Context = M->getContext();
bool LE = TM.isLittleEndian();
std::string Name = F.getName();
std::string SectionName = ".mips16.call.fp." + Name;
std::string StubName = "__call_stub_fp_" + Name;
//
// see if we already have the stub
//
Function *FStub = M->getFunction(StubName);
if (FStub && !FStub->isDeclaration()) return;
FStub = Function::Create(F.getFunctionType(),
Function::InternalLinkage, StubName, M);
FStub->addFnAttr("mips16_fp_stub");
FStub->addFnAttr(llvm::Attribute::Naked);
FStub->addFnAttr(llvm::Attribute::NoInline);
FStub->addFnAttr(llvm::Attribute::NoUnwind);
FStub->addFnAttr("nomips16");
FStub->setSection(SectionName);
BasicBlock *BB = BasicBlock::Create(Context, "entry", FStub);
FPReturnVariant RV = whichFPReturnVariant(FStub->getReturnType());
FPParamVariant PV = whichFPParamVariantNeeded(F);
std::string AsmText;
AsmText += ".set reorder\n";
AsmText += swapFPIntParams(PV, M, LE, true);
if (RV != NoFPRet) {
AsmText += "move $$18, $$31\n";
AsmText += "jal " + Name + "\n";
} else {
AsmText += "lui $$25, %hi(" + Name + ")\n";
AsmText += "addiu $$25, $$25, %lo(" + Name + ")\n";
}
switch (RV) {
case FRet:
AsmText += "mfc1 $$2, $$f0\n";
break;
case DRet:
if (LE) {
AsmText += "mfc1 $$2, $$f0\n";
AsmText += "mfc1 $$3, $$f1\n";
} else {
AsmText += "mfc1 $$3, $$f0\n";
AsmText += "mfc1 $$2, $$f1\n";
}
break;
case CFRet:
if (LE) {
AsmText += "mfc1 $$2, $$f0\n";
AsmText += "mfc1 $$3, $$f2\n";
} else {
AsmText += "mfc1 $$3, $$f0\n";
AsmText += "mfc1 $$3, $$f2\n";
}
break;
case CDRet:
if (LE) {
AsmText += "mfc1 $$4, $$f2\n";
AsmText += "mfc1 $$5, $$f3\n";
AsmText += "mfc1 $$2, $$f0\n";
AsmText += "mfc1 $$3, $$f1\n";
} else {
AsmText += "mfc1 $$5, $$f2\n";
AsmText += "mfc1 $$4, $$f3\n";
AsmText += "mfc1 $$3, $$f0\n";
AsmText += "mfc1 $$2, $$f1\n";
}
break;
case NoFPRet:
break;
}
if (RV != NoFPRet)
AsmText += "jr $$18\n";
else
AsmText += "jr $$25\n";
EmitInlineAsm(Context, BB, AsmText);
new UnreachableInst(Context, BB);
}
//
// Returns of float, double and complex need to be handled with a helper
// function.
//
static bool fixupFPReturnAndCall(Function &F, Module *M,
const MipsTargetMachine &TM) {
bool Modified = false;
LLVMContext &C = M->getContext();
Type *MyVoid = Type::getVoidTy(C);
for (auto &BB: F)
for (auto &I: BB) {
if (const ReturnInst *RI = dyn_cast<ReturnInst>(&I)) {
Value *RVal = RI->getReturnValue();
if (!RVal) continue;
//
// If there is a return value and it needs a helper function,
// figure out which one and add a call before the actual
// return to this helper. The purpose of the helper is to move
// floating point values from their soft float return mapping to
// where they would have been mapped to in floating point registers.
//
Type *T = RVal->getType();
FPReturnVariant RV = whichFPReturnVariant(T);
if (RV == NoFPRet) continue;
static const char *const Helper[NoFPRet] = {
"__mips16_ret_sf", "__mips16_ret_df", "__mips16_ret_sc",
"__mips16_ret_dc"
};
const char *Name = Helper[RV];
AttributeList A;
Value *Params[] = {RVal};
Modified = true;
//
// These helper functions have a different calling ABI so
// this __Mips16RetHelper indicates that so that later
// during call setup, the proper call lowering to the helper
// functions will take place.
//
A = A.addAttribute(C, AttributeList::FunctionIndex,
"__Mips16RetHelper");
A = A.addAttribute(C, AttributeList::FunctionIndex,
Attribute::ReadNone);
A = A.addAttribute(C, AttributeList::FunctionIndex,
Attribute::NoInline);
Value *F = (M->getOrInsertFunction(Name, A, MyVoid, T));
CallInst::Create(F, Params, "", &I);
} else if (const CallInst *CI = dyn_cast<CallInst>(&I)) {
FunctionType *FT = CI->getFunctionType();
Function *F_ = CI->getCalledFunction();
if (needsFPReturnHelper(*FT) &&
!(F_ && isIntrinsicInline(F_))) {
Modified=true;
F.addFnAttr("saveS2");
}
if (F_ && !isIntrinsicInline(F_)) {
// pic mode calls are handled by already defined
// helper functions
if (needsFPReturnHelper(*F_)) {
Modified=true;
F.addFnAttr("saveS2");
}
if (!TM.isPositionIndependent()) {
if (needsFPHelperFromSig(*F_)) {
assureFPCallStub(*F_, M, TM);
Modified=true;
}
}
}
}
}
return Modified;
}
MipsSubtarget::MipsSubtarget(const Triple &TT, const std::string &CPU,
const std::string &FS, bool little,
const MipsTargetMachine &TM)
: MipsGenSubtargetInfo(TT, CPU, FS), MipsArchVersion(MipsDefault),
IsLittle(little), IsSoftFloat(false), IsSingleFloat(false), IsFPXX(false),
NoABICalls(false), IsFP64bit(false), UseOddSPReg(true),
IsNaN2008bit(false), IsGP64bit(false), HasVFPU(false), HasCnMips(false),
HasMips3_32(false), HasMips3_32r2(false), HasMips4_32(false),
HasMips4_32r2(false), HasMips5_32r2(false), InMips16Mode(false),
InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
HasDSPR2(false), HasDSPR3(false), AllowMixed16_32(Mixed16_32 | Mips_Os16),
Os16(Mips_Os16), HasMSA(false), UseTCCInDIV(false), HasSym32(false),
HasEVA(false), TM(TM), TargetTriple(TT), TSInfo(),
InstrInfo(
MipsInstrInfo::create(initializeSubtargetDependencies(CPU, FS, TM))),
FrameLowering(MipsFrameLowering::create(*this)),
TLInfo(MipsTargetLowering::create(TM, *this)) {
PreviousInMips16Mode = InMips16Mode;
if (MipsArchVersion == MipsDefault)
MipsArchVersion = Mips32;
// Don't even attempt to generate code for MIPS-I and MIPS-V. They have not
// been tested and currently exist for the integrated assembler only.
if (MipsArchVersion == Mips1)
report_fatal_error("Code generation for MIPS-I is not implemented", false);
if (MipsArchVersion == Mips5)
report_fatal_error("Code generation for MIPS-V is not implemented", false);
// Check if Architecture and ABI are compatible.
assert(((!isGP64bit() && isABI_O32()) ||
(isGP64bit() && (isABI_N32() || isABI_N64()))) &&
"Invalid Arch & ABI pair.");
if (hasMSA() && !isFP64bit())
report_fatal_error("MSA requires a 64-bit FPU register file (FR=1 mode). "
"See -mattr=+fp64.",
false);
if (!isABI_O32() && !useOddSPReg())
report_fatal_error("-mattr=+nooddspreg requires the O32 ABI.", false);
if (IsFPXX && (isABI_N32() || isABI_N64()))
report_fatal_error("FPXX is not permitted for the N32/N64 ABI's.", false);
if (hasMips32r6()) {
StringRef ISA = hasMips64r6() ? "MIPS64r6" : "MIPS32r6";
assert(isFP64bit());
assert(isNaN2008());
if (hasDSP())
report_fatal_error(ISA + " is not compatible with the DSP ASE", false);
}
if (NoABICalls && TM.isPositionIndependent())
report_fatal_error("position-independent code requires '-mabicalls'");
if (isABI_N64() && !TM.isPositionIndependent() && !hasSym32())
NoABICalls = true;
// Set UseSmallSection.
UseSmallSection = GPOpt;
if (!NoABICalls && GPOpt) {
errs() << "warning: cannot use small-data accesses for '-mabicalls'"
<< "\n";
UseSmallSection = false;
}
}