1 //===- CodeMetrics.h - Measures the weight of a function---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements various weight measurements for a function, helping
11 // the Inliner and PartialSpecialization decide whether to duplicate its
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_ANALYSIS_CODEMETRICS_H
17 #define LLVM_ANALYSIS_CODEMETRICS_H
20 // CodeMetrics - Calculate size and a few similar metrics for a set of
23 /// NeverInline - True if this callee should never be inlined into a
27 // True if this function contains a call to setjmp or _setjmp
30 // True if this function calls itself
33 // True if this function contains one or more indirect branches
34 bool containsIndirectBr;
36 /// usesDynamicAlloca - True if this function calls alloca (in the C sense).
37 bool usesDynamicAlloca;
39 /// NumInsts, NumBlocks - Keep track of how large each function is, which
40 /// is used to estimate the code size cost of inlining it.
41 unsigned NumInsts, NumBlocks;
43 /// NumBBInsts - Keeps track of basic block code size estimates.
44 DenseMap<const BasicBlock *, unsigned> NumBBInsts;
46 /// NumCalls - Keep track of the number of calls to 'big' functions.
49 /// NumVectorInsts - Keep track of how many instructions produce vector
50 /// values. The inliner is being more aggressive with inlining vector
52 unsigned NumVectorInsts;
54 /// NumRets - Keep track of how many Ret instructions the block contains.
57 CodeMetrics() : callsSetJmp(false), isRecursive(false),
58 containsIndirectBr(false), usesDynamicAlloca(false),
59 NumInsts(0), NumBlocks(0), NumCalls(0), NumVectorInsts(0),
62 /// analyzeBasicBlock - Add information about the specified basic block
63 /// to the current structure.
64 void analyzeBasicBlock(const BasicBlock *BB);
66 /// analyzeFunction - Add information about the specified function
67 /// to the current structure.
68 void analyzeFunction(Function *F);