github.com/cloudwego/frugal@v0.1.15/internal/atm/ssa/pass_reduce.go (about)

     1  /*
     2   * Copyright 2022 ByteDance Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package ssa
    18  
    19  // Reduce combines CSE, PhiElim, CopyElim and TDCE.
    20  type Reduce struct{}
    21  
    22  var Reductions = []PassDescriptor {
    23      { Name: "Common Sub-expression Elimination" , Pass: new(CSE)      },
    24      { Name: "Phi Elimination"                   , Pass: new(PhiElim)  },
    25      { Name: "Copy Elimination"                  , Pass: new(CopyElim) },
    26      { Name: "Trivial Dead Code Elimination"     , Pass: new(TDCE)     },
    27  }
    28  
    29  func (Reduce) Apply(cfg *CFG) {
    30      for _, r := range Reductions {
    31          r.Pass.Apply(cfg)
    32      }
    33  }
    34