LLVM 19.0.0git
UnreachableBlockElim.h
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1//===-- UnreachableBlockElim.h - Remove unreachable blocks for codegen --===//
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 pass is an extremely simple version of the SimplifyCFG pass. Its sole
10// job is to delete LLVM basic blocks that are not reachable from the entry
11// node. To do this, it performs a simple depth first traversal of the CFG,
12// then deletes any unvisited nodes.
13//
14// Note that this pass is really a hack. In particular, the instruction
15// selectors for various targets should just not generate code for unreachable
16// blocks. Until LLVM has a more systematic way of defining instruction
17// selectors, however, we cannot really expect them to handle additional
18// complexity.
19//
20//===----------------------------------------------------------------------===//
21
22#ifndef LLVM_CODEGEN_UNREACHABLEBLOCKELIM_H
23#define LLVM_CODEGEN_UNREACHABLEBLOCKELIM_H
24
25#include "llvm/IR/PassManager.h"
26
27namespace llvm {
28
30 : public PassInfoMixin<UnreachableBlockElimPass> {
31public:
33};
34} // end namespace llvm
35
36#endif // LLVM_CODEGEN_UNREACHABLEBLOCKELIM_H
#define F(x, y, z)
Definition: MD5.cpp:55
This header defines various interfaces for pass management in LLVM.
A container for analyses that lazily runs them and caches their results.
Definition: PassManager.h:348
A set of analyses that are preserved following a run of a transformation pass.
Definition: Analysis.h:109
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM)
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
A CRTP mix-in to automatically provide informational APIs needed for passes.
Definition: PassManager.h:91