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74d368792a
This change adds an option to basic block sections to allow cold clusters to be assigned a custom text prefix. With a custom prefix such as ".text.split." (D87840), lld can place them in a separate output section. The benefits are - * Empirically shown to improve icache and itlb metrics by 3-5% (absolute) compared to placing split parts in .text.unlikely. * Mitigates against poor profiles, eg samplePGO profiles used with the machine function splitter. Optimizations such as hugepage remapping can make different decisions at the section granularity. * Enables section granularity hotness monitoring (checking on the decisions made during compilation vs sample data from production). Differential Revision: https://reviews.llvm.org/D87813
31 lines
979 B
C++
31 lines
979 B
C++
//===- BasicBlockSectionUtils.h - Utilities for basic block sections --===//
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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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#ifndef LLVM_CODEGEN_BASICBLOCKSECTIONUTILS_H
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#define LLVM_CODEGEN_BASICBLOCKSECTIONUTILS_H
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/CommandLine.h"
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namespace llvm {
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extern cl::opt<std::string> BBSectionsColdTextPrefix;
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class MachineFunction;
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class MachineBasicBlock;
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using MachineBasicBlockComparator =
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function_ref<bool(const MachineBasicBlock &, const MachineBasicBlock &)>;
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void sortBasicBlocksAndUpdateBranches(MachineFunction &MF,
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MachineBasicBlockComparator MBBCmp);
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} // end namespace llvm
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#endif // LLVM_CODEGEN_BASICBLOCKSECTIONUTILS_H
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