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//===- SimplifyInstructions.cpp - Specialized Delta Pass ------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements a function which calls the Generic Delta pass in order
// to simplify Instructions in defined functions.
//
//===----------------------------------------------------------------------===//
#include "SimplifyInstructions.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/IR/Constants.h"
using namespace llvm;
/// Calls simplifyInstruction in each instruction in functions, and replaces
/// their values.
static void extractInstrFromModule(Oracle &O, ReducerWorkItem &WorkItem) {
std::vector<Instruction *> InstsToDelete;
Module &Program = WorkItem.getModule();
const DataLayout &DL = Program.getDataLayout();
std::vector<Instruction *> InstToDelete;
for (auto &F : Program) {
for (auto &BB : F) {
for (auto &Inst : BB) {
SimplifyQuery Q(DL, &Inst);
if (Value *Simplified = simplifyInstruction(&Inst, Q)) {
if (O.shouldKeep())
continue;
Inst.replaceAllUsesWith(Simplified);
InstToDelete.push_back(&Inst);
}
}
}
}
for (Instruction *I : InstToDelete)
I->eraseFromParent();
}
void llvm::simplifyInstructionsDeltaPass(TestRunner &Test) {
runDeltaPass(Test, extractInstrFromModule, "Simplifying Instructions");
}
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