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570a4a5d9c
This time it's for real! I am going to hook this up in the frontends as well. The inliner has some experimental heuristics for dealing with the inline hint. When given a -respect-inlinehint option, functions marked with the inline keyword are given a threshold just above the default for -O3. We need some experiments to determine if that is the right thing to do. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95466 91177308-0d34-0410-b5e6-96231b3b80d8
94 lines
3.5 KiB
C++
94 lines
3.5 KiB
C++
//===- InlinerPass.h - Code common to all inliners --------------*- 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 defines a simple policy-based bottom-up inliner. This file
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// implements all of the boring mechanics of the bottom-up inlining, while the
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// subclass determines WHAT to inline, which is the much more interesting
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// component.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_IPO_INLINERPASS_H
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#define LLVM_TRANSFORMS_IPO_INLINERPASS_H
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#include "llvm/CallGraphSCCPass.h"
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namespace llvm {
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class CallSite;
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class TargetData;
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class InlineCost;
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template<class PtrType, unsigned SmallSize>
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class SmallPtrSet;
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/// Inliner - This class contains all of the helper code which is used to
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/// perform the inlining operations that do not depend on the policy.
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///
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struct Inliner : public CallGraphSCCPass {
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explicit Inliner(void *ID);
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explicit Inliner(void *ID, int Threshold);
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/// getAnalysisUsage - For this class, we declare that we require and preserve
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/// the call graph. If the derived class implements this method, it should
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/// always explicitly call the implementation here.
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virtual void getAnalysisUsage(AnalysisUsage &Info) const;
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// Main run interface method, this implements the interface required by the
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// Pass class.
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virtual bool runOnSCC(std::vector<CallGraphNode *> &SCC);
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// doFinalization - Remove now-dead linkonce functions at the end of
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// processing to avoid breaking the SCC traversal.
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virtual bool doFinalization(CallGraph &CG);
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/// This method returns the value specified by the -inline-threshold value,
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/// specified on the command line. This is typically not directly needed.
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///
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unsigned getInlineThreshold() const { return InlineThreshold; }
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/// Calculate the inline threshold for given Caller. This threshold is lower
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/// if the caller is marked with OptimizeForSize and -inline-threshold is not
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/// given on the comand line. It is higher if the callee is marked with the
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/// inlinehint attribute.
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///
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unsigned getInlineThreshold(CallSite CS) const;
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/// getInlineCost - This method must be implemented by the subclass to
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/// determine the cost of inlining the specified call site. If the cost
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/// returned is greater than the current inline threshold, the call site is
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/// not inlined.
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///
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virtual InlineCost getInlineCost(CallSite CS) = 0;
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// getInlineFudgeFactor - Return a > 1.0 factor if the inliner should use a
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// higher threshold to determine if the function call should be inlined.
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///
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virtual float getInlineFudgeFactor(CallSite CS) = 0;
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/// resetCachedCostInfo - erase any cached cost data from the derived class.
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/// If the derived class has no such data this can be empty.
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///
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virtual void resetCachedCostInfo(Function* Caller) = 0;
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/// removeDeadFunctions - Remove dead functions that are not included in
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/// DNR (Do Not Remove) list.
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bool removeDeadFunctions(CallGraph &CG,
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SmallPtrSet<const Function *, 16> *DNR = NULL);
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private:
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// InlineThreshold - Cache the value here for easy access.
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unsigned InlineThreshold;
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/// shouldInline - Return true if the inliner should attempt to
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/// inline at the given CallSite.
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bool shouldInline(CallSite CS);
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};
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} // End llvm namespace
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#endif
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