47 lines
1.7 KiB
C++
47 lines
1.7 KiB
C++
//===- ReduceInstructions.cpp - Specialized Delta Pass ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a function which calls the Generic Delta pass in order
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// to reduce uninteresting Instructions from defined functions.
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//
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//===----------------------------------------------------------------------===//
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#include "ReduceInstructions.h"
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#include "Utils.h"
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using namespace llvm;
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/// Filter out cases where deleting the instruction will likely cause the
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/// user/def of the instruction to fail the verifier.
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//
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// TODO: Technically the verifier only enforces preallocated token usage and
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// there is a none token.
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static bool shouldAlwaysKeep(const Instruction &I) {
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return I.isEHPad() || I.getType()->isTokenTy() || I.isSwiftError();
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}
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/// Removes out-of-chunk arguments from functions, and modifies their calls
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/// accordingly. It also removes allocations of out-of-chunk arguments.
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void llvm::reduceInstructionsDeltaPass(Oracle &O, ReducerWorkItem &WorkItem) {
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Module &Program = WorkItem.getModule();
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for (auto &F : Program) {
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for (auto &BB : F) {
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// Removing the terminator would make the block invalid. Only iterate over
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// instructions before the terminator.
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for (auto &Inst :
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make_early_inc_range(make_range(BB.begin(), std::prev(BB.end())))) {
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if (!shouldAlwaysKeep(Inst) && !O.shouldKeep()) {
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Inst.replaceAllUsesWith(getDefaultValue(Inst.getType()));
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Inst.eraseFromParent();
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}
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}
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}
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}
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}
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