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9b081d9691
analysis implementation. The header was already separated. Also cleanup all the comments in the header to follow a nice modern doxygen form. There is still plenty of cruft here, but some of that will fall out in subsequent refactorings and this was an easy step in the right direction. No functionality changed here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152898 91177308-0d34-0410-b5e6-96231b3b80d8
90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
//===- CodeMetrics.h - Code cost measurements -------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements various weight measurements for code, helping
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// the Inliner and other passes decide whether to duplicate its contents.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_CODEMETRICS_H
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#define LLVM_ANALYSIS_CODEMETRICS_H
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#include "llvm/ADT/DenseMap.h"
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namespace llvm {
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class BasicBlock;
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class Function;
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class TargetData;
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class Value;
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/// \brief Check whether a call will lower to something small.
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///
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/// This tests checks whether calls to this function will lower to something
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/// significantly cheaper than a traditional call, often a single
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/// instruction.
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bool callIsSmall(const Function *F);
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/// \brief Utility to calculate the size and a few similar metrics for a set
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/// of basic blocks.
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struct CodeMetrics {
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/// \brief True if this function contains a call to setjmp or other functions
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/// with attribute "returns twice" without having the attribute itself.
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bool exposesReturnsTwice;
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/// \brief True if this function calls itself.
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bool isRecursive;
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/// \brief True if this function contains one or more indirect branches.
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bool containsIndirectBr;
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/// \brief True if this function calls alloca (in the C sense).
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bool usesDynamicAlloca;
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/// \brief Number of instructions in the analyzed blocks.
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unsigned NumInsts;
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/// \brief Number of analyzed blocks.
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unsigned NumBlocks;
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/// \brief Keeps track of basic block code size estimates.
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DenseMap<const BasicBlock *, unsigned> NumBBInsts;
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/// \brief Keep track of the number of calls to 'big' functions.
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unsigned NumCalls;
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/// \brief The number of calls to internal functions with a single caller.
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///
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/// These are likely targets for future inlining, likely exposed by
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/// interleaved devirtualization.
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unsigned NumInlineCandidates;
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/// \brief How many instructions produce vector values.
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///
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/// The inliner is more aggressive with inlining vector kernels.
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unsigned NumVectorInsts;
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/// \brief How many 'ret' instructions the blocks contain.
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unsigned NumRets;
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CodeMetrics() : exposesReturnsTwice(false), isRecursive(false),
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containsIndirectBr(false), usesDynamicAlloca(false),
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NumInsts(0), NumBlocks(0), NumCalls(0),
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NumInlineCandidates(0), NumVectorInsts(0),
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NumRets(0) {}
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/// \brief Add information about a block to the current state.
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void analyzeBasicBlock(const BasicBlock *BB, const TargetData *TD = 0);
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/// \brief Add information about a function to the current state.
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void analyzeFunction(Function *F, const TargetData *TD = 0);
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};
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}
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#endif
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