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

   1 //===- ReduceInstructionFlagsMIR.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 reduce uninteresting MachineInstr flags from the MachineFunction.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "ReduceInstructionFlagsMIR.h"
  15 #include "llvm/CodeGen/MachineFunction.h"
  16 #include "llvm/CodeGen/MachineModuleInfo.h"
  17 using namespace llvm;
  18
  19 static void removeFlagsFromModule(Oracle &O, ReducerWorkItem &WorkItem) {
  20   for (const Function &F : WorkItem.getModule()) {
  21     if (auto *MF = WorkItem.MMI->getMachineFunction(F)) {
  22       for (MachineBasicBlock &MBB : *MF) {
  23         for (MachineInstr &MI : MBB) {
  24           // TODO: Should this clear flags individually?
  25           if (MI.getFlags() != 0 && !O.shouldKeep())
  26             MI.setFlags(0);
  27         }
  28       }
  29     }
  30   }
  31 }
  32
  33 void llvm::reduceInstructionFlagsMIRDeltaPass(TestRunner &Test) {
  34   runDeltaPass(Test, removeFlagsFromModule, "Reducing Instruction Flags");
  35 }