forked from OSchip/llvm-project
148 lines
4.0 KiB
C++
148 lines
4.0 KiB
C++
//===---- MipsOs16.cpp for Mips Option -Os16 --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an optimization phase for the MIPS target.
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//
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//===----------------------------------------------------------------------===//
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#include "MipsOs16.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#define DEBUG_TYPE "mips-os16"
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static cl::opt<std::string> Mips32FunctionMask(
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"mips32-function-mask",
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cl::init(""),
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cl::desc("Force function to be mips32"),
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cl::Hidden);
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namespace {
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// Figure out if we need float point based on the function signature.
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// We need to move variables in and/or out of floating point
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// registers because of the ABI
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//
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bool needsFPFromSig(Function &F) {
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Type* RetType = F.getReturnType();
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switch (RetType->getTypeID()) {
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case Type::FloatTyID:
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case Type::DoubleTyID:
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return true;
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default:
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;
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}
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if (F.arg_size() >=1) {
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Argument &Arg = F.getArgumentList().front();
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switch (Arg.getType()->getTypeID()) {
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case Type::FloatTyID:
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case Type::DoubleTyID:
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return true;
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default:
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;
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}
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}
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return false;
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}
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// Figure out if the function will need floating point operations
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//
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bool needsFP(Function &F) {
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if (needsFPFromSig(F))
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return true;
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for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
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for (BasicBlock::const_iterator I = BB->begin(), E = BB->end();
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I != E; ++I) {
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const Instruction &Inst = *I;
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switch (Inst.getOpcode()) {
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case Instruction::FAdd:
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case Instruction::FSub:
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case Instruction::FMul:
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case Instruction::FDiv:
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case Instruction::FRem:
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case Instruction::FPToUI:
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case Instruction::FPToSI:
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case Instruction::UIToFP:
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case Instruction::SIToFP:
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case Instruction::FPTrunc:
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case Instruction::FPExt:
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case Instruction::FCmp:
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return true;
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default:
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;
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}
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if (const CallInst *CI = dyn_cast<CallInst>(I)) {
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DEBUG(dbgs() << "Working on call" << "\n");
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Function &F_ = *CI->getCalledFunction();
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if (needsFPFromSig(F_))
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return true;
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}
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}
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return false;
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}
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}
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namespace llvm {
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bool MipsOs16::runOnModule(Module &M) {
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bool usingMask = Mips32FunctionMask.length() > 0;
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bool doneUsingMask = false; // this will make it stop repeating
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DEBUG(dbgs() << "Run on Module MipsOs16 \n" << Mips32FunctionMask << "\n");
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if (usingMask)
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DEBUG(dbgs() << "using mask \n" << Mips32FunctionMask << "\n");
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unsigned int functionIndex = 0;
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bool modified = false;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
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if (F->isDeclaration()) continue;
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DEBUG(dbgs() << "Working on " << F->getName() << "\n");
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if (usingMask) {
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if (!doneUsingMask) {
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if (functionIndex == Mips32FunctionMask.length())
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functionIndex = 0;
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switch (Mips32FunctionMask[functionIndex]) {
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case '1':
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DEBUG(dbgs() << "mask forced mips32: " << F->getName() << "\n");
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F->addFnAttr("nomips16");
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break;
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case '.':
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doneUsingMask = true;
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break;
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default:
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break;
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}
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functionIndex++;
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}
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}
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else {
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if (needsFP(*F)) {
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DEBUG(dbgs() << "os16 forced mips32: " << F->getName() << "\n");
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F->addFnAttr("nomips16");
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}
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else {
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DEBUG(dbgs() << "os16 forced mips16: " << F->getName() << "\n");
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F->addFnAttr("mips16");
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}
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}
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}
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return modified;
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}
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char MipsOs16::ID = 0;
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}
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ModulePass *llvm::createMipsOs16(MipsTargetMachine &TM) {
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return new MipsOs16;
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}
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