95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
//===- CodeMetrics.h - Code cost measurements -------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 AssumptionCache;
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class BasicBlock;
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class Loop;
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class Function;
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template <class T> class SmallPtrSetImpl;
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class TargetTransformInfo;
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class Value;
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/// 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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/// 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 = false;
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/// True if this function calls itself.
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bool isRecursive = false;
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/// 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 = false;
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/// True if this function contains a call to a convergent function.
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bool convergent = false;
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/// True if this function calls alloca (in the C sense).
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bool usesDynamicAlloca = false;
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/// Number of instructions in the analyzed blocks.
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unsigned NumInsts = false;
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/// Number of analyzed blocks.
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unsigned NumBlocks = false;
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/// Keeps track of basic block code size estimates.
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DenseMap<const BasicBlock *, unsigned> NumBBInsts;
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/// Keep track of the number of calls to 'big' functions.
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unsigned NumCalls = false;
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/// 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 = 0;
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/// 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 = 0;
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/// How many 'ret' instructions the blocks contain.
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unsigned NumRets = 0;
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/// 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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const SmallPtrSetImpl<const Value *> &EphValues,
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bool PrepareForLTO = false);
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/// 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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/// 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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