6f288bd772
Having a separate counting method runs the risk of a mismatch between the actual reduction method and the counting method. Instead, create an Oracle that always returns true for shouldKeep(), run the reduction, and count how many times shouldKeep() was called. The module should not be modified if shouldKeep() always returns true. Reviewed By: Meinersbur Differential Revision: https://reviews.llvm.org/D113537
43 lines
1.5 KiB
C++
43 lines
1.5 KiB
C++
//===- ReduceSpecialGlobals.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 special globals, like @llvm.used, in the provided Module.
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//
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// For more details about special globals, see
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// https://llvm.org/docs/LangRef.html#intrinsic-global-variables
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//
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//===----------------------------------------------------------------------===//
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#include "ReduceSpecialGlobals.h"
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#include "Delta.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/GlobalValue.h"
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using namespace llvm;
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static StringRef SpecialGlobalNames[] = {"llvm.used", "llvm.compiler.used"};
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/// Removes all special globals aren't inside any of the
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/// desired Chunks.
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static void extractSpecialGlobalsFromModule(Oracle &O, Module &Program) {
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for (StringRef Name : SpecialGlobalNames) {
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if (auto *Used = Program.getNamedGlobal(Name)) {
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Used->replaceAllUsesWith(UndefValue::get(Used->getType()));
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Used->eraseFromParent();
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}
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}
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}
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void llvm::reduceSpecialGlobalsDeltaPass(TestRunner &Test) {
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errs() << "*** Reducing Special Globals ...\n";
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runDeltaPass(Test, extractSpecialGlobalsFromModule);
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errs() << "----------------------------\n";
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}
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