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//===---- MipsOs16.cpp for Mips Option -Os16 --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an optimization phase for the MIPS target.
//
//===----------------------------------------------------------------------===//
#include "Mips.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "mips-os16"
static cl::opt<std::string> Mips32FunctionMask(
"mips32-function-mask",
cl::init(""),
cl::desc("Force function to be mips32"),
cl::Hidden);
namespace {
class MipsOs16 : public ModulePass {
public:
static char ID;
MipsOs16() : ModulePass(ID) {}
StringRef getPassName() const override { return "MIPS Os16 Optimization"; }
bool runOnModule(Module &M) override;
};
char MipsOs16::ID = 0;
}
// Figure out if we need float point based on the function signature.
// We need to move variables in and/or out of floating point
// registers because of the ABI
//
static bool needsFPFromSig(Function &F) {
Type* RetType = F.getReturnType();
switch (RetType->getTypeID()) {
case Type::FloatTyID:
case Type::DoubleTyID:
return true;
default:
;
}
if (F.arg_size() >=1) {
Argument &Arg = *F.arg_begin();
switch (Arg.getType()->getTypeID()) {
case Type::FloatTyID:
case Type::DoubleTyID:
return true;
default:
;
}
}
return false;
}
// Figure out if the function will need floating point operations
//
static bool needsFP(Function &F) {
if (needsFPFromSig(F))
return true;
for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
I != E; ++I) {
const Instruction &Inst = *I;
switch (Inst.getOpcode()) {
case Instruction::FAdd:
case Instruction::FSub:
case Instruction::FMul:
case Instruction::FDiv:
case Instruction::FRem:
case Instruction::FPToUI:
case Instruction::FPToSI:
case Instruction::UIToFP:
case Instruction::SIToFP:
case Instruction::FPTrunc:
case Instruction::FPExt:
case Instruction::FCmp:
return true;
default:
;
}
if (const CallInst *CI = dyn_cast<CallInst>(I)) {
DEBUG(dbgs() << "Working on call" << "\n");
Function &F_ = *CI->getCalledFunction();
if (needsFPFromSig(F_))
return true;
}
}
return false;
}
bool MipsOs16::runOnModule(Module &M) {
bool usingMask = Mips32FunctionMask.length() > 0;
bool doneUsingMask = false; // this will make it stop repeating
DEBUG(dbgs() << "Run on Module MipsOs16 \n" << Mips32FunctionMask << "\n");
if (usingMask)
DEBUG(dbgs() << "using mask \n" << Mips32FunctionMask << "\n");
unsigned int functionIndex = 0;
bool modified = false;
for (auto &F : M) {
if (F.isDeclaration())
continue;
DEBUG(dbgs() << "Working on " << F.getName() << "\n");
if (usingMask) {
if (!doneUsingMask) {
if (functionIndex == Mips32FunctionMask.length())
functionIndex = 0;
switch (Mips32FunctionMask[functionIndex]) {
case '1':
DEBUG(dbgs() << "mask forced mips32: " << F.getName() << "\n");
F.addFnAttr("nomips16");
break;
case '.':
doneUsingMask = true;
break;
default:
break;
}
functionIndex++;
}
}
else {
if (needsFP(F)) {
DEBUG(dbgs() << "os16 forced mips32: " << F.getName() << "\n");
F.addFnAttr("nomips16");
}
else {
DEBUG(dbgs() << "os16 forced mips16: " << F.getName() << "\n");
F.addFnAttr("mips16");
}
}
}
return modified;
}
ModulePass *llvm::createMipsOs16Pass() { return new MipsOs16(); }
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