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analysis to be methods on the cost analysis's function info object instead of the code metrics object. These really are just users of the code metrics, they're building the information for the function's analysis. This is the first step of growing the amount of information we collect about a function in order to cope with pair-wise simplifications due to allocas. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152283 91177308-0d34-0410-b5e6-96231b3b80d8
92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
//===- CodeMetrics.h - Measures the weight of a function---------*- 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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// CodeMetrics - Calculate size and a few similar metrics for a set of
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// basic blocks.
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struct CodeMetrics {
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/// NeverInline - True if this callee should never be inlined into a
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/// caller.
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// bool NeverInline;
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// 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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// True if this function calls itself
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bool isRecursive;
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// True if this function contains one or more indirect branches
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bool containsIndirectBr;
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/// usesDynamicAlloca - True if this function calls alloca (in the C sense).
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bool usesDynamicAlloca;
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/// NumInsts, NumBlocks - Keep track of how large each function is, which
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/// is used to estimate the code size cost of inlining it.
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unsigned NumInsts, NumBlocks;
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/// NumBBInsts - Keeps track of basic block code size estimates.
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DenseMap<const BasicBlock *, unsigned> NumBBInsts;
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/// NumCalls - Keep track of the number of calls to 'big' functions.
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unsigned NumCalls;
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/// NumInlineCandidates - Keep track of the number of calls to internal
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/// functions with only a single caller. These are likely targets for
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/// future inlining, likely exposed by interleaved devirtualization.
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unsigned NumInlineCandidates;
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/// NumVectorInsts - Keep track of how many instructions produce vector
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/// values. The inliner is being more aggressive with inlining vector
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/// kernels.
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unsigned NumVectorInsts;
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/// NumRets - Keep track of how many Ret instructions the block contains.
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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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/// analyzeBasicBlock - Add information about the specified basic block
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/// to the current structure.
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void analyzeBasicBlock(const BasicBlock *BB, const TargetData *TD = 0);
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/// analyzeFunction - Add information about the specified function
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/// to the current structure.
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void analyzeFunction(Function *F, const TargetData *TD = 0);
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/// CountBonusForConstant - Figure out an approximation for how much
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/// per-call performance boost we can expect if the specified value is
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/// constant.
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unsigned CountBonusForConstant(Value *V);
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};
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}
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#endif
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