57 lines
2.2 KiB
Diff
57 lines
2.2 KiB
Diff
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From a9863e2b6e6783aa9be0b9d1d187084fd4b32a3a Mon Sep 17 00:00:00 2001
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From: Muhammad Asif Manzoor <muhammad.asif.manzoor1@huawei.com>
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Date: Thu, 21 Mar 2024 12:50:38 -0400
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Subject: [PATCH] Add BiSheng Autotuner support for LLVM compiler
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Automatic tuning is an automatic iterative process that optimizes a given
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program by manipulating compilation options for optimal performance.
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BiSheng Autotuner provides a resumable interface for tuning process. BiSheng
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Autotuner can tune 1) individual code segments/blocks (fine grain turning) like
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loops, callsites, instructions, etc. and 2) entire modules/programs (coarse
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grain tuning) for compiler flags, pass ordering, etc.
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This patch enables LLVM compiler to extract tuneable code regions and then apply
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suggested configuration (by Autotuner) to find out the optimal configurations.
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---
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lld/ELF/Driver.cpp | 18 ++++++++++++++++++
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1 file changed, 18 insertions(+)
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diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
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index c2059c70e15a..ffd0842b9078 100644
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--- a/lld/ELF/Driver.cpp
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+++ b/lld/ELF/Driver.cpp
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@@ -341,6 +341,18 @@ void LinkerDriver::addLibrary(StringRef name) {
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// Technically this can be delayed until we read bitcode files, but
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// we don't bother to do lazily because the initialization is fast.
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static void initLLVM() {
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+#if defined(ENABLE_AUTOTUNER)
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+ // AUTO-TUNING - initialization
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+ if (Error E = autotuning::Engine.init(config->outputFile.data())) {
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+ error(toString(std::move(E)));
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+ return;
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+ }
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+ if (autotuning::Engine.isEnabled() && autotuning::Engine.isParseInput() &&
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+ (autotuning::Engine.LLVMParams.size() ||
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+ autotuning::Engine.ProgramParams.size()))
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+ llvm::cl::ParseAutoTunerOptions(autotuning::Engine.LLVMParams,
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+ autotuning::Engine.ProgramParams);
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+#endif
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmPrinters();
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@@ -2814,6 +2826,12 @@ void LinkerDriver::link(opt::InputArgList &args) {
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reportBackrefs();
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writeArchiveStats();
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writeWhyExtract();
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+#if defined(ENABLE_AUTOTUNER)
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+ // AUTO-TUNING - finalization
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+ if (Error E = autotuning::Engine.finalize()) {
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+ error(toString(std::move(E)));
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+ }
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+#endif
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if (errorCount())
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return;
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--
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2.33.0
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