//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "inline"
-#include "llvm/Module.h"
-#include "llvm/Instructions.h"
-#include "llvm/IntrinsicInst.h"
+#include "llvm/Transforms/IPO/InlinerPass.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/InlineCost.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Transforms/IPO/InlinerPass.h"
-#include "llvm/Transforms/Utils/Cloning.h"
-#include "llvm/Transforms/Utils/Local.h"
+#include "llvm/DataLayout.h"
+#include "llvm/Instructions.h"
+#include "llvm/IntrinsicInst.h"
+#include "llvm/Module.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/Statistic.h"
+#include "llvm/Target/TargetLibraryInfo.h"
+#include "llvm/Transforms/Utils/Cloning.h"
+#include "llvm/Transforms/Utils/Local.h"
using namespace llvm;
STATISTIC(NumInlined, "Number of functions inlined");
STATISTIC(NumDeleted, "Number of functions deleted because all callers found");
STATISTIC(NumMergedAllocas, "Number of allocas merged together");
+// This weirdly named statistic tracks the number of times that, when attempting
+// to inline a function A into B, we analyze the callers of B in order to see
+// if those would be more profitable and blocked inline steps.
+STATISTIC(NumCallerCallersAnalyzed, "Number of caller-callers analyzed");
+
static cl::opt<int>
InlineLimit("inline-threshold", cl::Hidden, cl::init(225), cl::ZeroOrMore,
cl::desc("Control the amount of inlining to perform (default = 225)"));
// If the inlined function had a higher stack protection level than the
// calling function, then bump up the caller's stack protection level.
- if (Callee->hasFnAttr(Attribute::StackProtectReq))
- Caller->addFnAttr(Attribute::StackProtectReq);
- else if (Callee->hasFnAttr(Attribute::StackProtect) &&
- !Caller->hasFnAttr(Attribute::StackProtectReq))
- Caller->addFnAttr(Attribute::StackProtect);
+ if (Callee->getFnAttributes().hasAttribute(Attributes::StackProtectReq))
+ Caller->addFnAttr(Attributes::StackProtectReq);
+ else if (Callee->getFnAttributes().hasAttribute(Attributes::StackProtect) &&
+ !Caller->getFnAttributes().hasAttribute(Attributes::StackProtectReq))
+ Caller->addFnAttr(Attributes::StackProtect);
// Look at all of the allocas that we inlined through this call site. If we
// have already inlined other allocas through other calls into this function,
}
unsigned Inliner::getInlineThreshold(CallSite CS) const {
- int thres = InlineThreshold;
+ int thres = InlineThreshold; // -inline-threshold or else selected by
+ // overall opt level
- // Listen to optsize when -inline-limit is not given.
+ // If -inline-threshold is not given, listen to the optsize attribute when it
+ // would decrease the threshold.
Function *Caller = CS.getCaller();
- if (Caller && !Caller->isDeclaration() &&
- Caller->hasFnAttr(Attribute::OptimizeForSize) &&
- InlineLimit.getNumOccurrences() == 0)
+ bool OptSize = Caller && !Caller->isDeclaration() &&
+ Caller->getFnAttributes().hasAttribute(Attributes::OptimizeForSize);
+ if (!(InlineLimit.getNumOccurrences() > 0) && OptSize &&
+ OptSizeThreshold < thres)
thres = OptSizeThreshold;
- // Listen to inlinehint when it would increase the threshold.
+ // Listen to the inlinehint attribute when it would increase the threshold.
Function *Callee = CS.getCalledFunction();
- if (HintThreshold > thres && Callee && !Callee->isDeclaration() &&
- Callee->hasFnAttr(Attribute::InlineHint))
+ bool InlineHint = Callee && !Callee->isDeclaration() &&
+ Callee->getFnAttributes().hasAttribute(Attributes::InlineHint);
+ if (InlineHint && HintThreshold > thres)
thres = HintThreshold;
return thres;
return false;
}
- int Cost = IC.getValue();
Function *Caller = CS.getCaller();
- int CurrentThreshold = getInlineThreshold(CS);
- float FudgeFactor = getInlineFudgeFactor(CS);
- int AdjThreshold = (int)(CurrentThreshold * FudgeFactor);
- if (Cost >= AdjThreshold) {
- DEBUG(dbgs() << " NOT Inlining: cost=" << Cost
- << ", thres=" << AdjThreshold
+ if (!IC) {
+ DEBUG(dbgs() << " NOT Inlining: cost=" << IC.getCost()
+ << ", thres=" << (IC.getCostDelta() + IC.getCost())
<< ", Call: " << *CS.getInstruction() << "\n");
return false;
}
// are used. Thus we will always have the opportunity to make local inlining
// decisions. Importantly the linkonce-ODR linkage covers inline functions
// and templates in C++.
+ //
+ // FIXME: All of this logic should be sunk into getInlineCost. It relies on
+ // the internal implementation of the inline cost metrics rather than
+ // treating them as truly abstract units etc.
if (Caller->hasLocalLinkage() ||
Caller->getLinkage() == GlobalValue::LinkOnceODRLinkage) {
int TotalSecondaryCost = 0;
- bool outerCallsFound = false;
+ // The candidate cost to be imposed upon the current function.
+ int CandidateCost = IC.getCost() - (InlineConstants::CallPenalty + 1);
// This bool tracks what happens if we do NOT inline C into B.
bool callerWillBeRemoved = Caller->hasLocalLinkage();
// This bool tracks what happens if we DO inline C into B.
}
InlineCost IC2 = getInlineCost(CS2);
- if (IC2.isNever())
+ ++NumCallerCallersAnalyzed;
+ if (!IC2) {
callerWillBeRemoved = false;
- if (IC2.isAlways() || IC2.isNever())
+ continue;
+ }
+ if (IC2.isAlways())
continue;
- outerCallsFound = true;
- int Cost2 = IC2.getValue();
- int CurrentThreshold2 = getInlineThreshold(CS2);
- float FudgeFactor2 = getInlineFudgeFactor(CS2);
-
- if (Cost2 >= (int)(CurrentThreshold2 * FudgeFactor2))
- callerWillBeRemoved = false;
-
- // See if we have this case. We subtract off the penalty
- // for the call instruction, which we would be deleting.
- if (Cost2 < (int)(CurrentThreshold2 * FudgeFactor2) &&
- Cost2 + Cost - (InlineConstants::CallPenalty + 1) >=
- (int)(CurrentThreshold2 * FudgeFactor2)) {
+ // See if inlining or original callsite would erase the cost delta of
+ // this callsite. We subtract off the penalty for the call instruction,
+ // which we would be deleting.
+ if (IC2.getCostDelta() <= CandidateCost) {
inliningPreventsSomeOuterInline = true;
- TotalSecondaryCost += Cost2;
+ TotalSecondaryCost += IC2.getCost();
}
}
// If all outer calls to Caller would get inlined, the cost for the last
if (callerWillBeRemoved && Caller->use_begin() != Caller->use_end())
TotalSecondaryCost += InlineConstants::LastCallToStaticBonus;
- if (outerCallsFound && inliningPreventsSomeOuterInline &&
- TotalSecondaryCost < Cost) {
- DEBUG(dbgs() << " NOT Inlining: " << *CS.getInstruction() <<
- " Cost = " << Cost <<
+ if (inliningPreventsSomeOuterInline && TotalSecondaryCost < IC.getCost()) {
+ DEBUG(dbgs() << " NOT Inlining: " << *CS.getInstruction() <<
+ " Cost = " << IC.getCost() <<
", outer Cost = " << TotalSecondaryCost << '\n');
return false;
}
}
- DEBUG(dbgs() << " Inlining: cost=" << Cost
- << ", thres=" << AdjThreshold
+ DEBUG(dbgs() << " Inlining: cost=" << IC.getCost()
+ << ", thres=" << (IC.getCostDelta() + IC.getCost())
<< ", Call: " << *CS.getInstruction() << '\n');
return true;
}
bool Inliner::runOnSCC(CallGraphSCC &SCC) {
CallGraph &CG = getAnalysis<CallGraph>();
- const TargetData *TD = getAnalysisIfAvailable<TargetData>();
+ const DataLayout *TD = getAnalysisIfAvailable<DataLayout>();
+ const TargetLibraryInfo *TLI = getAnalysisIfAvailable<TargetLibraryInfo>();
SmallPtrSet<Function*, 8> SCCFunctions;
DEBUG(dbgs() << "Inliner visiting SCC:");
// just delete the call instead of trying to inline it, regardless of
// size. This happens because IPSCCP propagates the result out of the
// call and then we're left with the dead call.
- if (isInstructionTriviallyDead(CS.getInstruction())) {
+ if (isInstructionTriviallyDead(CS.getInstruction(), TLI)) {
DEBUG(dbgs() << " -> Deleting dead call: "
<< *CS.getInstruction() << "\n");
// Update the call graph by deleting the edge from Callee to Caller.
CG[Caller]->removeCallEdgeFor(CS);
CS.getInstruction()->eraseFromParent();
++NumCallsDeleted;
- // Update the cached cost info with the missing call
- growCachedCostInfo(Caller, NULL);
} else {
// We can only inline direct calls to non-declarations.
if (Callee == 0 || Callee->isDeclaration()) continue;
CallSites.push_back(std::make_pair(CallSite(Ptr), NewHistoryID));
}
}
-
- // Update the cached cost info with the inlined call.
- growCachedCostInfo(Caller, Callee);
}
// If we inlined or deleted the last possible call site to the function,
// Remove any call graph edges from the callee to its callees.
CalleeNode->removeAllCalledFunctions();
- resetCachedCostInfo(Callee);
-
// Removing the node for callee from the call graph and delete it.
delete CG.removeFunctionFromModule(CalleeNode);
++NumDeleted;
// Handle the case when this function is called and we only want to care
// about always-inline functions. This is a bit of a hack to share code
// between here and the InlineAlways pass.
- if (AlwaysInlineOnly && !F->hasFnAttr(Attribute::AlwaysInline))
+ if (AlwaysInlineOnly &&
+ !F->getFnAttributes().hasAttribute(Attributes::AlwaysInline))
continue;
// If the only remaining users of the function are dead constants, remove
// Note that it doesn't matter that we are iterating over a non-stable order
// here to do this, it doesn't matter which order the functions are deleted
// in.
- std::sort(FunctionsToRemove.begin(), FunctionsToRemove.end());
+ array_pod_sort(FunctionsToRemove.begin(), FunctionsToRemove.end());
FunctionsToRemove.erase(std::unique(FunctionsToRemove.begin(),
FunctionsToRemove.end()),
FunctionsToRemove.end());
for (SmallVectorImpl<CallGraphNode *>::iterator I = FunctionsToRemove.begin(),
E = FunctionsToRemove.end();
I != E; ++I) {
- resetCachedCostInfo((*I)->getFunction());
delete CG.removeFunctionFromModule(*I);
++NumDeleted;
}
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