include/llvm/Transforms/Scalar/ADCE.h

   1 //===- ADCE.h - Aggressive dead code elimination ----------------*- C++ -*-===//
   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 file provides the interface for the Aggressive Dead Code Elimination
  10 // pass. This pass optimistically assumes that all instructions are dead until
  11 // proven otherwise, allowing it to eliminate dead computations that other DCE
  12 // passes do not catch, particularly involving loop computations.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #ifndef LLVM_TRANSFORMS_SCALAR_ADCE_H
  17 #define LLVM_TRANSFORMS_SCALAR_ADCE_H
  18
  19 #include "llvm/IR/PassManager.h"
  20
  21 namespace llvm {
  22
  23 class Function;
  24
  25 /// A DCE pass that assumes instructions are dead until proven otherwise.
  26 ///
  27 /// This pass eliminates dead code by optimistically assuming that all
  28 /// instructions are dead until proven otherwise. This allows it to eliminate
  29 /// dead computations that other DCE passes do not catch, particularly involving
  30 /// loop computations.
  31 struct ADCEPass : PassInfoMixin<ADCEPass> {
  32   PreservedAnalyses run(Function &F, FunctionAnalysisManager &);
  33 };
  34
  35 } // end namespace llvm
  36
  37 #endif // LLVM_TRANSFORMS_SCALAR_ADCE_H