llvm/tools/llvm-reduce/deltas/SimplifyInstructions.cpp

   1 //===- SimplifyInstructions.cpp - Specialized Delta Pass ------------------===//
   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 implements a function which calls the Generic Delta pass in order
  10 // to simplify Instructions in defined functions.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "SimplifyInstructions.h"
  15 #include "llvm/Analysis/InstructionSimplify.h"
  16 #include "llvm/IR/Constants.h"
  17
  18 using namespace llvm;
  19
  20 /// Calls simplifyInstruction in each instruction in functions, and replaces
  21 /// their values.
  22 static void extractInstrFromModule(Oracle &O, ReducerWorkItem &WorkItem) {
  23   std::vector<Instruction *> InstsToDelete;
  24
  25   Module &Program = WorkItem.getModule();
  26   const DataLayout &DL = Program.getDataLayout();
  27
  28   std::vector<Instruction *> InstToDelete;
  29   for (auto &F : Program) {
  30     for (auto &BB : F) {
  31       for (auto &Inst : BB) {
  32
  33         SimplifyQuery Q(DL, &Inst);
  34         if (Value *Simplified = simplifyInstruction(&Inst, Q)) {
  35           if (O.shouldKeep())
  36             continue;
  37           Inst.replaceAllUsesWith(Simplified);
  38           InstToDelete.push_back(&Inst);
  39         }
  40       }
  41     }
  42   }
  43
  44   for (Instruction *I : InstToDelete)
  45     I->eraseFromParent();
  46 }
  47
  48 void llvm::simplifyInstructionsDeltaPass(TestRunner &Test) {
  49   runDeltaPass(Test, extractInstrFromModule, "Simplifying Instructions");
  50 }