mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-27 05:53:07 +01:00
3c79328838
has hard float, when you compile the mips32 code you have to make sure that it knows to compile any mips32 routines as hard float. I need to clean up the way mips16 hard float is specified but I need to first think through all the details. Mips16 always has a form of soft float, the difference being whether the underlying hardware has floating point. So it's not really necessary to pass the -soft-float to llvm since soft-float is always true for mips16 by virtue of the fact that it will not register floating point registers. By using this fact, I can simplify the way this is all handled. llvm-svn: 189690
496 lines
14 KiB
C++
496 lines
14 KiB
C++
//===---- Mips16HardFloat.cpp for Mips16 Hard Float --------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines a pass needed for Mips16 Hard Float
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "mips16-hard-float"
|
|
#include "Mips16HardFloat.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include <algorithm>
|
|
#include <string>
|
|
|
|
static void inlineAsmOut
|
|
(LLVMContext &C, StringRef AsmString, BasicBlock *BB ) {
|
|
std::vector<llvm::Type *> AsmArgTypes;
|
|
std::vector<llvm::Value*> AsmArgs;
|
|
llvm::FunctionType *AsmFTy =
|
|
llvm::FunctionType::get(Type::getVoidTy(C),
|
|
AsmArgTypes, false);
|
|
llvm::InlineAsm *IA =
|
|
llvm::InlineAsm::get(AsmFTy, AsmString, "", true,
|
|
/* IsAlignStack */ false,
|
|
llvm::InlineAsm::AD_ATT);
|
|
CallInst::Create(IA, AsmArgs, "", BB);
|
|
}
|
|
|
|
namespace {
|
|
|
|
class InlineAsmHelper {
|
|
LLVMContext &C;
|
|
BasicBlock *BB;
|
|
public:
|
|
InlineAsmHelper(LLVMContext &C_, BasicBlock *BB_) :
|
|
C(C_), BB(BB_) {
|
|
}
|
|
|
|
void Out(StringRef AsmString) {
|
|
inlineAsmOut(C, AsmString, BB);
|
|
}
|
|
|
|
};
|
|
}
|
|
//
|
|
// Return types that matter for hard float are:
|
|
// float, double, complex float, and complex double
|
|
//
|
|
enum FPReturnVariant {
|
|
FRet, DRet, CFRet, CDRet, NoFPRet
|
|
};
|
|
|
|
//
|
|
// Determine which FP return type this function has
|
|
//
|
|
static FPReturnVariant whichFPReturnVariant(Type *T) {
|
|
switch (T->getTypeID()) {
|
|
case Type::FloatTyID:
|
|
return FRet;
|
|
case Type::DoubleTyID:
|
|
return DRet;
|
|
case Type::StructTyID:
|
|
if (T->getStructNumElements() != 2)
|
|
break;
|
|
if ((T->getContainedType(0)->isFloatTy()) &&
|
|
(T->getContainedType(1)->isFloatTy()))
|
|
return CFRet;
|
|
if ((T->getContainedType(0)->isDoubleTy()) &&
|
|
(T->getContainedType(1)->isDoubleTy()))
|
|
return CDRet;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return NoFPRet;
|
|
}
|
|
|
|
//
|
|
// Parameter type that matter are float, (float, float), (float, double),
|
|
// double, (double, double), (double, float)
|
|
//
|
|
enum FPParamVariant {
|
|
FSig, FFSig, FDSig,
|
|
DSig, DDSig, DFSig, NoSig
|
|
};
|
|
|
|
// which floating point parameter signature variant we are dealing with
|
|
//
|
|
typedef Type::TypeID TypeID;
|
|
const Type::TypeID FloatTyID = Type::FloatTyID;
|
|
const Type::TypeID DoubleTyID = Type::DoubleTyID;
|
|
|
|
static FPParamVariant whichFPParamVariantNeeded(Function &F) {
|
|
switch (F.arg_size()) {
|
|
case 0:
|
|
return NoSig;
|
|
case 1:{
|
|
TypeID ArgTypeID = F.getFunctionType()->getParamType(0)->getTypeID();
|
|
switch (ArgTypeID) {
|
|
case FloatTyID:
|
|
return FSig;
|
|
case DoubleTyID:
|
|
return DSig;
|
|
default:
|
|
return NoSig;
|
|
}
|
|
}
|
|
default: {
|
|
TypeID ArgTypeID0 = F.getFunctionType()->getParamType(0)->getTypeID();
|
|
TypeID ArgTypeID1 = F.getFunctionType()->getParamType(1)->getTypeID();
|
|
switch(ArgTypeID0) {
|
|
case FloatTyID: {
|
|
switch (ArgTypeID1) {
|
|
case FloatTyID:
|
|
return FFSig;
|
|
case DoubleTyID:
|
|
return FDSig;
|
|
default:
|
|
return FSig;
|
|
}
|
|
}
|
|
case DoubleTyID: {
|
|
switch (ArgTypeID1) {
|
|
case FloatTyID:
|
|
return DFSig;
|
|
case DoubleTyID:
|
|
return DDSig;
|
|
default:
|
|
return DSig;
|
|
}
|
|
}
|
|
default:
|
|
return NoSig;
|
|
}
|
|
}
|
|
}
|
|
llvm_unreachable("can't get here");
|
|
}
|
|
|
|
// Figure out if we need float point based on the function parameters.
|
|
// We need to move variables in and/or out of floating point
|
|
// registers because of the ABI
|
|
//
|
|
static bool needsFPStubFromParams(Function &F) {
|
|
if (F.arg_size() >=1) {
|
|
Type *ArgType = F.getFunctionType()->getParamType(0);
|
|
switch (ArgType->getTypeID()) {
|
|
case Type::FloatTyID:
|
|
case Type::DoubleTyID:
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool needsFPReturnHelper(Function &F) {
|
|
Type* RetType = F.getReturnType();
|
|
return whichFPReturnVariant(RetType) != NoFPRet;
|
|
}
|
|
|
|
static bool needsFPHelperFromSig(Function &F) {
|
|
return needsFPStubFromParams(F) || needsFPReturnHelper(F);
|
|
}
|
|
|
|
//
|
|
// We swap between FP and Integer registers to allow Mips16 and Mips32 to
|
|
// interoperate
|
|
//
|
|
|
|
static void swapFPIntParams
|
|
(FPParamVariant PV, Module *M, InlineAsmHelper &IAH,
|
|
bool LE, bool ToFP) {
|
|
//LLVMContext &Context = M->getContext();
|
|
std::string MI = ToFP? "mtc1 ": "mfc1 ";
|
|
switch (PV) {
|
|
case FSig:
|
|
IAH.Out(MI + "$$4,$$f12");
|
|
break;
|
|
case FFSig:
|
|
IAH.Out(MI +"$$4,$$f12");
|
|
IAH.Out(MI + "$$5,$$f14");
|
|
break;
|
|
case FDSig:
|
|
IAH.Out(MI + "$$4,$$f12");
|
|
if (LE) {
|
|
IAH.Out(MI + "$$6,$$f14");
|
|
IAH.Out(MI + "$$7,$$f15");
|
|
} else {
|
|
IAH.Out(MI + "$$7,$$f14");
|
|
IAH.Out(MI + "$$6,$$f15");
|
|
}
|
|
break;
|
|
case DSig:
|
|
if (LE) {
|
|
IAH.Out(MI + "$$4,$$f12");
|
|
IAH.Out(MI + "$$5,$$f13");
|
|
} else {
|
|
IAH.Out(MI + "$$5,$$f12");
|
|
IAH.Out(MI + "$$4,$$f13");
|
|
}
|
|
break;
|
|
case DDSig:
|
|
if (LE) {
|
|
IAH.Out(MI + "$$4,$$f12");
|
|
IAH.Out(MI + "$$5,$$f13");
|
|
IAH.Out(MI + "$$6,$$f14");
|
|
IAH.Out(MI + "$$7,$$f15");
|
|
} else {
|
|
IAH.Out(MI + "$$5,$$f12");
|
|
IAH.Out(MI + "$$4,$$f13");
|
|
IAH.Out(MI + "$$7,$$f14");
|
|
IAH.Out(MI + "$$6,$$f15");
|
|
}
|
|
break;
|
|
case DFSig:
|
|
if (LE) {
|
|
IAH.Out(MI + "$$4,$$f12");
|
|
IAH.Out(MI + "$$5,$$f13");
|
|
} else {
|
|
IAH.Out(MI + "$$5,$$f12");
|
|
IAH.Out(MI + "$$4,$$f13");
|
|
}
|
|
IAH.Out(MI + "$$6,$$f14");
|
|
break;
|
|
case NoSig:
|
|
return;
|
|
}
|
|
}
|
|
//
|
|
// Make sure that we know we already need a stub for this function.
|
|
// Having called needsFPHelperFromSig
|
|
//
|
|
static void assureFPCallStub(Function &F, Module *M,
|
|
const MipsSubtarget &Subtarget){
|
|
// for now we only need them for static relocation
|
|
if (Subtarget.getRelocationModel() == Reloc::PIC_)
|
|
return;
|
|
LLVMContext &Context = M->getContext();
|
|
bool LE = Subtarget.isLittle();
|
|
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);
|
|
InlineAsmHelper IAH(Context, BB);
|
|
IAH.Out(".set reorder");
|
|
FPReturnVariant RV = whichFPReturnVariant(FStub->getReturnType());
|
|
FPParamVariant PV = whichFPParamVariantNeeded(F);
|
|
swapFPIntParams(PV, M, IAH, LE, true);
|
|
if (RV != NoFPRet) {
|
|
IAH.Out("move $$18, $$31");
|
|
IAH.Out("jal " + Name);
|
|
} else {
|
|
IAH.Out("lui $$25,%hi(" + Name + ")");
|
|
IAH.Out("addiu $$25,$$25,%lo(" + Name + ")" );
|
|
}
|
|
switch (RV) {
|
|
case FRet:
|
|
IAH.Out("mfc1 $$2,$$f0");
|
|
break;
|
|
case DRet:
|
|
if (LE) {
|
|
IAH.Out("mfc1 $$2,$$f0");
|
|
IAH.Out("mfc1 $$3,$$f1");
|
|
} else {
|
|
IAH.Out("mfc1 $$3,$$f0");
|
|
IAH.Out("mfc1 $$2,$$f1");
|
|
}
|
|
break;
|
|
case CFRet:
|
|
if (LE) {
|
|
IAH.Out("mfc1 $$2,$$f0");
|
|
IAH.Out("mfc1 $$3,$$f2");
|
|
} else {
|
|
IAH.Out("mfc1 $$3,$$f0");
|
|
IAH.Out("mfc1 $$3,$$f2");
|
|
}
|
|
break;
|
|
case CDRet:
|
|
if (LE) {
|
|
IAH.Out("mfc1 $$4,$$f2");
|
|
IAH.Out("mfc1 $$5,$$f3");
|
|
IAH.Out("mfc1 $$2,$$f0");
|
|
IAH.Out("mfc1 $$3,$$f1");
|
|
|
|
} else {
|
|
IAH.Out("mfc1 $$5,$$f2");
|
|
IAH.Out("mfc1 $$4,$$f3");
|
|
IAH.Out("mfc1 $$3,$$f0");
|
|
IAH.Out("mfc1 $$2,$$f1");
|
|
}
|
|
break;
|
|
case NoFPRet:
|
|
break;
|
|
}
|
|
if (RV != NoFPRet)
|
|
IAH.Out("jr $$18");
|
|
else
|
|
IAH.Out("jr $$25");
|
|
new UnreachableInst(Context, BB);
|
|
}
|
|
|
|
//
|
|
// Functions that are inline intrinsics don't need helpers.
|
|
//
|
|
static const char *IntrinsicInline[] =
|
|
{"fabs", "llvm.powi.f64"};
|
|
|
|
static bool isIntrinsicInline(Function *F) {
|
|
return std::binary_search(
|
|
IntrinsicInline, array_endof(IntrinsicInline),
|
|
F->getName());
|
|
}
|
|
//
|
|
// Returns of float, double and complex need to be handled with a helper
|
|
// function.
|
|
//
|
|
static bool fixupFPReturnAndCall
|
|
(Function &F, Module *M, const MipsSubtarget &Subtarget) {
|
|
bool Modified = false;
|
|
LLVMContext &C = M->getContext();
|
|
Type *MyVoid = Type::getVoidTy(C);
|
|
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
|
|
for (BasicBlock::iterator I = BB->begin(), E = BB->end();
|
|
I != E; ++I) {
|
|
Instruction &Inst = *I;
|
|
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* Helper[NoFPRet] =
|
|
{"__mips16_ret_sf", "__mips16_ret_df", "__mips16_ret_sc",
|
|
"__mips16_ret_dc"};
|
|
const char *Name = Helper[RV];
|
|
AttributeSet 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, AttributeSet::FunctionIndex,
|
|
"__Mips16RetHelper");
|
|
A = A.addAttribute(C, AttributeSet::FunctionIndex,
|
|
Attribute::ReadNone);
|
|
A = A.addAttribute(C, AttributeSet::FunctionIndex,
|
|
Attribute::NoInline);
|
|
Value *F = (M->getOrInsertFunction(Name, A, MyVoid, T, NULL));
|
|
CallInst::Create(F, Params, "", &Inst );
|
|
} else if (const CallInst *CI = dyn_cast<CallInst>(I)) {
|
|
// pic mode calls are handled by already defined
|
|
// helper functions
|
|
if (Subtarget.getRelocationModel() != Reloc::PIC_ ) {
|
|
Function *F_ = CI->getCalledFunction();
|
|
if (F_ && !isIntrinsicInline(F_) && needsFPHelperFromSig(*F_)) {
|
|
assureFPCallStub(*F_, M, Subtarget);
|
|
Modified=true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return Modified;
|
|
}
|
|
|
|
static void createFPFnStub(Function *F, Module *M, FPParamVariant PV,
|
|
const MipsSubtarget &Subtarget ) {
|
|
bool PicMode = Subtarget.getRelocationModel() == Reloc::PIC_;
|
|
bool LE = Subtarget.isLittle();
|
|
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);
|
|
InlineAsmHelper IAH(Context, BB);
|
|
IAH.Out(" .set macro");
|
|
if (PicMode) {
|
|
IAH.Out(".set noreorder");
|
|
IAH.Out(".cpload $$2");
|
|
IAH.Out(".set reorder");
|
|
IAH.Out(".reloc 0,R_MIPS_NONE," + Name);
|
|
IAH.Out("la $$25," + LocalName);
|
|
}
|
|
else
|
|
IAH.Out("la $$25, " + Name);
|
|
swapFPIntParams(PV, M, IAH, LE, false);
|
|
IAH.Out("jr $$25");
|
|
IAH.Out(LocalName + " = " + Name);
|
|
new UnreachableInst(FStub->getContext(), BB);
|
|
}
|
|
|
|
//
|
|
// remove the use-soft-float attribute
|
|
//
|
|
static void removeUseSoftFloat(Function &F) {
|
|
AttributeSet A;
|
|
DEBUG(errs() << "removing -use-soft-float\n");
|
|
A = A.addAttribute(F.getContext(), AttributeSet::FunctionIndex,
|
|
"use-soft-float", "false");
|
|
F.removeAttributes(AttributeSet::FunctionIndex, A);
|
|
if (F.hasFnAttribute("use-soft-float")) {
|
|
DEBUG(errs() << "still has -use-soft-float\n");
|
|
}
|
|
F.addAttributes(AttributeSet::FunctionIndex, A);
|
|
}
|
|
|
|
namespace llvm {
|
|
|
|
//
|
|
// This pass only makes sense when the underlying chip has floating point but
|
|
// we are compiling as mips16.
|
|
// For all mips16 functions (that are not stubs we have already generated), or
|
|
// declared via attributes as nomips16, we must:
|
|
// 1) fixup all returns of float, double, single and double complex
|
|
// by calling a helper function before the actual return.
|
|
// 2) generate helper functions (stubs) that can be called by mips32 functions
|
|
// that will move parameters passed normally passed in floating point
|
|
// registers the soft float equivalents.
|
|
// 3) in the case of static relocation, generate helper functions so that
|
|
// mips16 functions can call extern functions of unknown type (mips16 or
|
|
// mips32).
|
|
// 4) TBD. For pic, calls to extern functions of unknown type are handled by
|
|
// predefined helper functions in libc but this work is currently done
|
|
// during call lowering but it should be moved here in the future.
|
|
//
|
|
bool Mips16HardFloat::runOnModule(Module &M) {
|
|
DEBUG(errs() << "Run on Module Mips16HardFloat\n");
|
|
bool Modified = false;
|
|
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
|
|
if (F->hasFnAttribute("nomips16") &&
|
|
F->hasFnAttribute("use-soft-float")) {
|
|
removeUseSoftFloat(*F);
|
|
continue;
|
|
}
|
|
if (F->isDeclaration() || F->hasFnAttribute("mips16_fp_stub") ||
|
|
F->hasFnAttribute("nomips16")) continue;
|
|
Modified |= fixupFPReturnAndCall(*F, &M, Subtarget);
|
|
FPParamVariant V = whichFPParamVariantNeeded(*F);
|
|
if (V != NoSig) {
|
|
Modified = true;
|
|
createFPFnStub(F, &M, V, Subtarget);
|
|
}
|
|
}
|
|
return Modified;
|
|
}
|
|
|
|
char Mips16HardFloat::ID = 0;
|
|
|
|
}
|
|
|
|
ModulePass *llvm::createMips16HardFloat(MipsTargetMachine &TM) {
|
|
return new Mips16HardFloat(TM);
|
|
}
|
|
|