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
21using namespace llvm;
22
23namespace {
24void 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
43PreservedAnalyses InstructionNamerPass::run(Function &F,
44 FunctionAnalysisManager &FAM) {
45 nameInstructions(F);
46 return PreservedAnalyses::all();
47}
48