1 //===- InstructionNamer.cpp - Give anonymous instructions names -----------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This is a little utility pass that gives instructions names, this is mostly 10 // useful when diffing the effect of an optimization because deleting an 11 // unnamed instruction can change all other instruction numbering, making the 12 // diff very noisy. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #include "llvm/Transforms/Utils/InstructionNamer.h" 17 #include "llvm/IR/Function.h" 18 #include "llvm/IR/PassManager.h" 19 #include "llvm/IR/Type.h" 20 21 using namespace llvm; 22 23 namespace { 24 void nameInstructions(Function &F) { 25 for (auto &Arg : F.args()) { 26 if (!Arg.hasName()) 27 Arg.setName("arg"); 28 } 29 30 for (BasicBlock &BB : F) { 31 if (!BB.hasName()) 32 BB.setName("bb"); 33 34 for (Instruction &I : BB) { 35 if (!I.hasName() && !I.getType()->isVoidTy()) 36 I.setName("i"); 37 } 38 } 39 } 40 41 } // namespace 42 43 PreservedAnalyses InstructionNamerPass::run(Function &F, 44 FunctionAnalysisManager &FAM) { 45 nameInstructions(F); 46 return PreservedAnalyses::all(); 47 } 48