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https://github.com/c64scene-ar/llvm-6502.git
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b2ab2fa524
We want heuristics to be based on accurate data, but more importantly we don't want llvm to behave randomly. A benign trunc inserted by an upstream pass should not cause a wild swings in optimization level. See PR11034. It's a general problem with threshold-based heuristics, but we can make it less bad. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140919 91177308-0d34-0410-b5e6-96231b3b80d8
89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
//===- InlineAlways.cpp - Code to inline always_inline functions ----------===//
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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 a custom inliner that handles only functions that
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// are marked as "always inline".
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "inline"
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#include "llvm/CallingConv.h"
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#include "llvm/Instructions.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Analysis/InlineCost.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/IPO/InlinerPass.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/ADT/SmallPtrSet.h"
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using namespace llvm;
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namespace {
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// AlwaysInliner only inlines functions that are mark as "always inline".
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class AlwaysInliner : public Inliner {
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// Functions that are never inlined
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SmallPtrSet<const Function*, 16> NeverInline;
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InlineCostAnalyzer CA;
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public:
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// Use extremely low threshold.
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AlwaysInliner() : Inliner(ID, -2000000000) {
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initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
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}
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static char ID; // Pass identification, replacement for typeid
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InlineCost getInlineCost(CallSite CS) {
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return CA.getInlineCost(CS, NeverInline);
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}
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float getInlineFudgeFactor(CallSite CS) {
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return CA.getInlineFudgeFactor(CS);
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}
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void resetCachedCostInfo(Function *Caller) {
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CA.resetCachedCostInfo(Caller);
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}
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void growCachedCostInfo(Function* Caller, Function* Callee) {
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CA.growCachedCostInfo(Caller, Callee);
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}
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virtual bool doFinalization(CallGraph &CG) {
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return removeDeadFunctions(CG, &NeverInline);
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}
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virtual bool doInitialization(CallGraph &CG);
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void releaseMemory() {
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CA.clear();
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}
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};
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}
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char AlwaysInliner::ID = 0;
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INITIALIZE_PASS_BEGIN(AlwaysInliner, "always-inline",
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"Inliner for always_inline functions", false, false)
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INITIALIZE_AG_DEPENDENCY(CallGraph)
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INITIALIZE_PASS_END(AlwaysInliner, "always-inline",
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"Inliner for always_inline functions", false, false)
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Pass *llvm::createAlwaysInlinerPass() { return new AlwaysInliner(); }
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// doInitialization - Initializes the vector of functions that have not
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// been annotated with the "always inline" attribute.
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bool AlwaysInliner::doInitialization(CallGraph &CG) {
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CA.setTargetData(getAnalysisIfAvailable<TargetData>());
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Module &M = CG.getModule();
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for (Module::iterator I = M.begin(), E = M.end();
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I != E; ++I)
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if (!I->isDeclaration() && !I->hasFnAttr(Attribute::AlwaysInline))
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NeverInline.insert(I);
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return false;
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}
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