1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | //===---- MipsOs16.cpp for Mips Option -Os16 --------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // // 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)) { LLVM_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 LLVM_DEBUG(dbgs() << "Run on Module MipsOs16 \n" << Mips32FunctionMask << "\n"); if (usingMask) LLVM_DEBUG(dbgs() << "using mask \n" << Mips32FunctionMask << "\n"); unsigned int functionIndex = 0; bool modified = false; for (auto &F : M) { if (F.isDeclaration()) continue; LLVM_DEBUG(dbgs() << "Working on " << F.getName() << "\n"); if (usingMask) { if (!doneUsingMask) { if (functionIndex == Mips32FunctionMask.length()) functionIndex = 0; switch (Mips32FunctionMask[functionIndex]) { case '1': LLVM_DEBUG(dbgs() << "mask forced mips32: " << F.getName() << "\n"); F.addFnAttr("nomips16"); break; case '.': doneUsingMask = true; break; default: break; } functionIndex++; } } else { if (needsFP(F)) { LLVM_DEBUG(dbgs() << "os16 forced mips32: " << F.getName() << "\n"); F.addFnAttr("nomips16"); } else { LLVM_DEBUG(dbgs() << "os16 forced mips16: " << F.getName() << "\n"); F.addFnAttr("mips16"); } } } return modified; } ModulePass *llvm::createMipsOs16Pass() { return new MipsOs16(); } |