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+//===- InlineCost.h - Cost analysis for inliner -----------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements heuristics for inlining decisions.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_INLINECOST_H
+#define LLVM_ANALYSIS_INLINECOST_H
+
+#include "llvm/Analysis/AssumptionCache.h"
+#include "llvm/Analysis/CallGraphSCCPass.h"
+#include "llvm/Analysis/OptimizationRemarkEmitter.h"
+#include <cassert>
+#include <climits>
+
+namespace llvm {
+class AssumptionCacheTracker;
+class BlockFrequencyInfo;
+class CallSite;
+class DataLayout;
+class Function;
+class ProfileSummaryInfo;
+class TargetTransformInfo;
+
+namespace InlineConstants {
+// Various thresholds used by inline cost analysis.
+/// Use when optsize (-Os) is specified.
+const int OptSizeThreshold = 50;
+
+/// Use when minsize (-Oz) is specified.
+const int OptMinSizeThreshold = 5;
+
+/// Use when -O3 is specified.
+const int OptAggressiveThreshold = 250;
+
+// Various magic constants used to adjust heuristics.
+const int InstrCost = 5;
+const int IndirectCallThreshold = 100;
+const int CallPenalty = 25;
+const int LastCallToStaticBonus = 15000;
+const int ColdccPenalty = 2000;
+const int NoreturnPenalty = 10000;
+/// Do not inline functions which allocate this many bytes on the stack
+/// when the caller is recursive.
+const unsigned TotalAllocaSizeRecursiveCaller = 1024;
+}
+
+/// \brief Represents the cost of inlining a function.
+///
+/// This supports special values for functions which should "always" or
+/// "never" be inlined. Otherwise, the cost represents a unitless amount;
+/// smaller values increase the likelihood of the function being inlined.
+///
+/// Objects of this type also provide the adjusted threshold for inlining
+/// based on the information available for a particular callsite. They can be
+/// directly tested to determine if inlining should occur given the cost and
+/// threshold for this cost metric.
+class InlineCost {
+ enum SentinelValues {
+ AlwaysInlineCost = INT_MIN,
+ NeverInlineCost = INT_MAX
+ };
+
+ /// \brief The estimated cost of inlining this callsite.
+ const int Cost;
+
+ /// \brief The adjusted threshold against which this cost was computed.
+ const int Threshold;
+
+ // Trivial constructor, interesting logic in the factory functions below.
+ InlineCost(int Cost, int Threshold) : Cost(Cost), Threshold(Threshold) {}
+
+public:
+ static InlineCost get(int Cost, int Threshold) {
+ assert(Cost > AlwaysInlineCost && "Cost crosses sentinel value");
+ assert(Cost < NeverInlineCost && "Cost crosses sentinel value");
+ return InlineCost(Cost, Threshold);
+ }
+ static InlineCost getAlways() {
+ return InlineCost(AlwaysInlineCost, 0);
+ }
+ static InlineCost getNever() {
+ return InlineCost(NeverInlineCost, 0);
+ }
+
+ /// \brief Test whether the inline cost is low enough for inlining.
+ explicit operator bool() const {
+ return Cost < Threshold;
+ }
+
+ bool isAlways() const { return Cost == AlwaysInlineCost; }
+ bool isNever() const { return Cost == NeverInlineCost; }
+ bool isVariable() const { return !isAlways() && !isNever(); }
+
+ /// \brief Get the inline cost estimate.
+ /// It is an error to call this on an "always" or "never" InlineCost.
+ int getCost() const {
+ assert(isVariable() && "Invalid access of InlineCost");
+ return Cost;
+ }
+
+ /// \brief Get the threshold against which the cost was computed
+ int getThreshold() const {
+ assert(isVariable() && "Invalid access of InlineCost");
+ return Threshold;
+ }
+
+ /// \brief Get the cost delta from the threshold for inlining.
+ /// Only valid if the cost is of the variable kind. Returns a negative
+ /// value if the cost is too high to inline.
+ int getCostDelta() const { return Threshold - getCost(); }
+};
+
+/// Thresholds to tune inline cost analysis. The inline cost analysis decides
+/// the condition to apply a threshold and applies it. Otherwise,
+/// DefaultThreshold is used. If a threshold is Optional, it is applied only
+/// when it has a valid value. Typically, users of inline cost analysis
+/// obtain an InlineParams object through one of the \c getInlineParams methods
+/// and pass it to \c getInlineCost. Some specialized versions of inliner
+/// (such as the pre-inliner) might have custom logic to compute \c InlineParams
+/// object.
+
+struct InlineParams {
+ /// The default threshold to start with for a callee.
+ int DefaultThreshold;
+
+ /// Threshold to use for callees with inline hint.
+ Optional<int> HintThreshold;
+
+ /// Threshold to use for cold callees.
+ Optional<int> ColdThreshold;
+
+ /// Threshold to use when the caller is optimized for size.
+ Optional<int> OptSizeThreshold;
+
+ /// Threshold to use when the caller is optimized for minsize.
+ Optional<int> OptMinSizeThreshold;
+
+ /// Threshold to use when the callsite is considered hot.
+ Optional<int> HotCallSiteThreshold;
+
+ /// Threshold to use when the callsite is considered hot relative to function
+ /// entry.
+ Optional<int> LocallyHotCallSiteThreshold;
+
+ /// Threshold to use when the callsite is considered cold.
+ Optional<int> ColdCallSiteThreshold;
+
+ /// Compute inline cost even when the cost has exceeded the threshold.
+ Optional<bool> ComputeFullInlineCost;
+};
+
+/// Generate the parameters to tune the inline cost analysis based only on the
+/// commandline options.
+InlineParams getInlineParams();
+
+/// Generate the parameters to tune the inline cost analysis based on command
+/// line options. If -inline-threshold option is not explicitly passed,
+/// \p Threshold is used as the default threshold.
+InlineParams getInlineParams(int Threshold);
+
+/// Generate the parameters to tune the inline cost analysis based on command
+/// line options. If -inline-threshold option is not explicitly passed,
+/// the default threshold is computed from \p OptLevel and \p SizeOptLevel.
+/// An \p OptLevel value above 3 is considered an aggressive optimization mode.
+/// \p SizeOptLevel of 1 corresponds to the -Os flag and 2 corresponds to
+/// the -Oz flag.
+InlineParams getInlineParams(unsigned OptLevel, unsigned SizeOptLevel);
+
+/// Return the cost associated with a callsite, including parameter passing
+/// and the call/return instruction.
+int getCallsiteCost(CallSite CS, const DataLayout &DL);
+
+/// \brief Get an InlineCost object representing the cost of inlining this
+/// callsite.
+///
+/// Note that a default threshold is passed into this function. This threshold
+/// could be modified based on callsite's properties and only costs below this
+/// new threshold are computed with any accuracy. The new threshold can be
+/// used to bound the computation necessary to determine whether the cost is
+/// sufficiently low to warrant inlining.
+///
+/// Also note that calling this function *dynamically* computes the cost of
+/// inlining the callsite. It is an expensive, heavyweight call.
+InlineCost getInlineCost(
+ CallSite CS, const InlineParams &Params, TargetTransformInfo &CalleeTTI,
+ std::function<AssumptionCache &(Function &)> &GetAssumptionCache,
+ Optional<function_ref<BlockFrequencyInfo &(Function &)>> GetBFI,
+ ProfileSummaryInfo *PSI, OptimizationRemarkEmitter *ORE = nullptr);
+
+/// \brief Get an InlineCost with the callee explicitly specified.
+/// This allows you to calculate the cost of inlining a function via a
+/// pointer. This behaves exactly as the version with no explicit callee
+/// parameter in all other respects.
+//
+InlineCost
+getInlineCost(CallSite CS, Function *Callee, const InlineParams &Params,
+ TargetTransformInfo &CalleeTTI,
+ std::function<AssumptionCache &(Function &)> &GetAssumptionCache,
+ Optional<function_ref<BlockFrequencyInfo &(Function &)>> GetBFI,
+ ProfileSummaryInfo *PSI, OptimizationRemarkEmitter *ORE);
+
+/// \brief Minimal filter to detect invalid constructs for inlining.
+bool isInlineViable(Function &Callee);
+}
+
+#endif