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108 lines
3.7 KiB
C++
108 lines
3.7 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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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/IR/CallSite.h"
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namespace llvm {
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class AssumptionCache;
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class BasicBlock;
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class Loop;
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class Function;
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class Instruction;
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class DataLayout;
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class TargetTransformInfo;
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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 this callsite will lower to something
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/// significantly cheaper than a traditional call, often a single
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/// instruction. Note that if isInstructionFree(CS.getInstruction()) would
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/// return true, so will this function.
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bool callIsSmall(ImmutableCallSite CS);
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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 cannot be duplicated.
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///
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/// True if this function contains one or more indirect branches, or it contains
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/// one or more 'noduplicate' instructions.
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bool notDuplicatable;
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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()
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: exposesReturnsTwice(false), isRecursive(false), notDuplicatable(false),
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usesDynamicAlloca(false), NumInsts(0), NumBlocks(0), NumCalls(0),
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NumInlineCandidates(0), NumVectorInsts(0), 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 TargetTransformInfo &TTI,
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SmallPtrSetImpl<const Value*> &EphValues);
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/// \brief Collect a loop's ephemeral values (those used only by an assume
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/// or similar intrinsics in the loop).
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static void collectEphemeralValues(const Loop *L, AssumptionCache *AC,
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SmallPtrSetImpl<const Value *> &EphValues);
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/// \brief Collect a functions's ephemeral values (those used only by an
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/// assume or similar intrinsics in the function).
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static void collectEphemeralValues(const Function *L, AssumptionCache *AC,
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SmallPtrSetImpl<const Value *> &EphValues);
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};
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}
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#endif
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