11a6799740
Currently, when the -relink-builtin-bitcodes-postop option is used we link builtin bitcodes twice: once before optimization, and again after optimization. With this change, we omit the pre-opt linking when the option is set, and we rename the option to the following: -Xclang -mlink-builtin-bitcodes-postopt (-Xclang -mno-link-builtin-bitcodes-postopt) The goal of this change is to reduce compile time. We do lose the theoretical benefits of pre-opt linking, but in practice these are small than the overhead of linking twice. However we may be able to address this in a future patch by adjusting the position of the builtin-bitcode linking pass. Compilations not setting the option are unaffected
36 lines
1.1 KiB
C++
36 lines
1.1 KiB
C++
//===-- LinkInModulesPass.cpp - Module Linking pass --------------- C++ -*-===//
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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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/// \file
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///
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/// LinkInModulesPass implementation.
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///
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//===----------------------------------------------------------------------===//
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#include "LinkInModulesPass.h"
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#include "BackendConsumer.h"
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#include "clang/Basic/CodeGenOptions.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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using namespace llvm;
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LinkInModulesPass::LinkInModulesPass(clang::BackendConsumer *BC,
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bool ShouldLinkFiles)
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: BC(BC), ShouldLinkFiles(ShouldLinkFiles) {}
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PreservedAnalyses LinkInModulesPass::run(Module &M, ModuleAnalysisManager &AM) {
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if (!BC)
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return PreservedAnalyses::all();
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if (BC->LinkInModules(&M, ShouldLinkFiles))
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report_fatal_error("Bitcode module postopt linking failed, aborted!");
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return PreservedAnalyses::none();
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}
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