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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.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mips-os16"
#include "MipsOs16.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
namespace {
// 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
//
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.getArgumentList().front();
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
//
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;
}
}
namespace llvm {
bool MipsOs16::runOnModule(Module &M) {
DEBUG(errs() << "Run on Module MipsOs16\n");
bool modified = false;
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
if (F->isDeclaration()) continue;
DEBUG(dbgs() << "Working on " << F->getName() << "\n");
if (needsFP(*F)) {
DEBUG(dbgs() << " need to compile as nomips16 \n");
F->addFnAttr("nomips16");
}
else {
F->addFnAttr("mips16");
DEBUG(dbgs() << " no need to compile as nomips16 \n");
}
}
return modified;
}
char MipsOs16::ID = 0;
}
ModulePass *llvm::createMipsOs16(MipsTargetMachine &TM) {
return new MipsOs16;
}
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