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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40560 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
//===- InlineCost.cpp - Cost analysis for inliner ---------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 bottom-up inlining of functions into callees.
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//
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//===----------------------------------------------------------------------===//
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#ifndef INLINECOST_H
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#define INLINECOST_H
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#include "llvm/ADT/SmallPtrSet.h"
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#include <map>
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#include <vector>
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namespace llvm {
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class Value;
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class Function;
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class CallSite;
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/// InlineCostAnalyzer - Cost analyzer used by inliner.
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class InlineCostAnalyzer {
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struct ArgInfo {
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public:
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unsigned ConstantWeight;
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unsigned AllocaWeight;
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ArgInfo(unsigned CWeight, unsigned AWeight)
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: ConstantWeight(CWeight), AllocaWeight(AWeight) {}
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};
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// FunctionInfo - For each function, calculate the size of it in blocks and
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// instructions.
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struct FunctionInfo {
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// NumInsts, NumBlocks - Keep track of how large each function is, which is
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// used to estimate the code size cost of inlining it.
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unsigned NumInsts, NumBlocks;
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// ArgumentWeights - Each formal argument of the function is inspected to
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// see if it is used in any contexts where making it a constant or alloca
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// would reduce the code size. If so, we add some value to the argument
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// entry here.
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std::vector<ArgInfo> ArgumentWeights;
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FunctionInfo() : NumInsts(0), NumBlocks(0) {}
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/// analyzeFunction - Fill in the current structure with information gleaned
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/// from the specified function.
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void analyzeFunction(Function *F);
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// CountCodeReductionForConstant - Figure out an approximation for how many
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// instructions will be constant folded if the specified value is constant.
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//
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unsigned CountCodeReductionForConstant(Value *V);
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// CountCodeReductionForAlloca - Figure out an approximation of how much smaller
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// the function will be if it is inlined into a context where an argument
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// becomes an alloca.
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//
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unsigned CountCodeReductionForAlloca(Value *V);
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};
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std::map<const Function *, FunctionInfo>CachedFunctionInfo;
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public:
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// getInlineCost - The heuristic used to determine if we should inline the
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// function call or not.
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//
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int getInlineCost(CallSite CS, SmallPtrSet<const Function *, 16> &NeverInline);
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};
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}
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#endif
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