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Hi Rafael, On 07/31/2017 04:20 PM, Rafael Avila de Espindola via llvm-dev wrote: > However, do we need to start with instrumentation? The original paper > uses sampling with good results and current intel cpus can record every > branch in a program. > > I would propose starting with just an lld patch that reads the call > graph from a file. The format would be very similar to

...const*, std::allocator<llvm::PassInfo const*> >::begin() const 1 1.5152 ld-2.19.so _dl_check_map_versions 1 1.5152 ld-2.19.so _dl_fixup 1 1.5152 ld-2.19.so do_lookup_x 1 1.5152 libLLVMAsmParser.so llvm::LLLexer::ReadString(llvm::lltok::Kind) 1 1.5152 libLLVMCodeGen.so llvm::MachineFunction::getName() const 1 1.5152 libLLVMCodeGen.so llvm::MachineOperand::isReg() const .... >From this you can see that lli is calling the oprofile interface. Oprofile is counting 6949 samples, but attr...

...;(this, &Sec, Name); + // Profile data. + if (Name == ".note.llvm.callgraph") { + ArrayRef<uint8_t> CallgraphBuff = + check(this->getObj().getSectionContents(&Sec)); + + StringRef Buff((const char *)CallgraphBuff.data(), CallgraphBuff.size()); + + auto ReadString = [&Buff]() { + size_t F = Buff.find_first_of(" \n"); + StringRef Ret = Buff.substr(0, F); + Buff = Buff.substr(F + 1); + return Ret; + }; + + while (!Buff.empty()) { + StringRef From = ReadString(); + StringRef To = ReadString(); + uint64_t Co...

...t;llvm::PassInfo const*> >::begin() const > 1 1.5152 ld-2.19.so _dl_check_map_versions > 1 1.5152 ld-2.19.so _dl_fixup > 1 1.5152 ld-2.19.so do_lookup_x > 1 1.5152 libLLVMAsmParser.so > llvm::LLLexer::ReadString(llvm::lltok::Kind) > 1 1.5152 libLLVMCodeGen.so > llvm::MachineFunction::getName() const > 1 1.5152 libLLVMCodeGen.so llvm::MachineOperand::isReg() > const > .... > > From this you can see that lli is calling the oprofile interface. Oprofile > is cou...

...;(this, &Sec, Name); + // Profile data. + if (Name == ".note.llvm.callgraph") { + ArrayRef<uint8_t> CallgraphBuff = + check(this->getObj().getSectionContents(&Sec)); + + StringRef Buff((const char *)CallgraphBuff.data(), CallgraphBuff.size()); + + auto ReadString = [&Buff]() { + size_t F = Buff.find_first_of(" \n"); + StringRef Ret = Buff.substr(0, F); + Buff = Buff.substr(F + 1); + return Ret; + }; + + while (!Buff.empty()) { + StringRef From = ReadString(); + StringRef To = ReadString(); + uint64_t Co...