CodeMetrics.h revision 42c7d23c6d56e0743169d94025264eaf17eb799d
1//===- CodeMetrics.h - Measures the weight of a function---------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements various weight measurements for a function, helping 11// the Inliner and PartialSpecialization decide whether to duplicate its 12// contents. 13// 14//===----------------------------------------------------------------------===// 15 16#ifndef LLVM_ANALYSIS_CODEMETRICS_H 17#define LLVM_ANALYSIS_CODEMETRICS_H 18 19namespace llvm { 20 // CodeMetrics - Calculate size and a few similar metrics for a set of 21 // basic blocks. 22 struct CodeMetrics { 23 /// NeverInline - True if this callee should never be inlined into a 24 /// caller. 25 // bool NeverInline; 26 27 // True if this function contains a call to setjmp or _setjmp 28 bool callsSetJmp; 29 30 // True if this function calls itself 31 bool isRecursive; 32 33 // True if this function contains one or more indirect branches 34 bool containsIndirectBr; 35 36 /// usesDynamicAlloca - True if this function calls alloca (in the C sense). 37 bool usesDynamicAlloca; 38 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; 42 43 /// NumBBInsts - Keeps track of basic block code size estimates. 44 DenseMap<const BasicBlock *, unsigned> NumBBInsts; 45 46 /// NumCalls - Keep track of the number of calls to 'big' functions. 47 unsigned NumCalls; 48 49 /// NumVectorInsts - Keep track of how many instructions produce vector 50 /// values. The inliner is being more aggressive with inlining vector 51 /// kernels. 52 unsigned NumVectorInsts; 53 54 /// NumRets - Keep track of how many Ret instructions the block contains. 55 unsigned NumRets; 56 57 CodeMetrics() : callsSetJmp(false), isRecursive(false), 58 containsIndirectBr(false), usesDynamicAlloca(false), 59 NumInsts(0), NumBlocks(0), NumCalls(0), NumVectorInsts(0), 60 NumRets(0) {} 61 62 /// analyzeBasicBlock - Add information about the specified basic block 63 /// to the current structure. 64 void analyzeBasicBlock(const BasicBlock *BB); 65 66 /// analyzeFunction - Add information about the specified function 67 /// to the current structure. 68 void analyzeFunction(Function *F); 69 }; 70} 71 72#endif 73