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Fix quadratic behavior in InlineFunction by fetching the personality function of the callee once and not for every invoke in the caller.

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The callee is usually smaller than the caller, too. This reduces the compile
time of ARMDisassembler.cpp by 32% (Release build). It still takes ages to
compile though.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145690 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2011-12-02 18:37:31 +00:00
parent 94f2dc90a5
commit 30fe1ae20d
1 changed files with 32 additions and 28 deletions
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60
lib/Transforms/Utils/InlineFunction.cpp
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@ -924,39 +924,43 @@ bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI) {
return false;
}
// Get the personality function from the callee if it contains a landing pad.
Value *CalleePersonality = 0;
for (Function::const_iterator I = CalledFunc->begin(), E = CalledFunc->end();
I != E; ++I)
if (const InvokeInst *II = dyn_cast<InvokeInst>(I->getTerminator())) {
const BasicBlock *BB = II->getUnwindDest();
// FIXME: This 'if/dyn_cast' here should become a normal 'cast' once
// the new EH system is in place.
if (const LandingPadInst *LP =
dyn_cast<LandingPadInst>(BB->getFirstNonPHI()))
CalleePersonality = LP->getPersonalityFn();
break;
}
// Find the personality function used by the landing pads of the caller. If it
// exists, then check to see that it matches the personality function used in
// the callee.
for (Function::const_iterator
I = Caller->begin(), E = Caller->end(); I != E; ++I)
if (const InvokeInst *II = dyn_cast<InvokeInst>(I->getTerminator())) {
const BasicBlock *BB = II->getUnwindDest();
// FIXME: This 'isa' here should become go away once the new EH system is
// in place.
if (!isa<LandingPadInst>(BB->getFirstNonPHI()))
continue;
const LandingPadInst *LP = cast<LandingPadInst>(BB->getFirstNonPHI());
const Value *CallerPersFn = LP->getPersonalityFn();
if (CalleePersonality)
for (Function::const_iterator I = Caller->begin(), E = Caller->end();
I != E; ++I)
if (const InvokeInst *II = dyn_cast<InvokeInst>(I->getTerminator())) {
const BasicBlock *BB = II->getUnwindDest();
// FIXME: This 'isa' here should become go away once the new EH system
// is in place.
if (!isa<LandingPadInst>(BB->getFirstNonPHI()))
continue;
const LandingPadInst *LP = cast<LandingPadInst>(BB->getFirstNonPHI());
// If the personality functions match, then we can perform the
// inlining. Otherwise, we can't inline.
// TODO: This isn't 100% true. Some personality functions are proper
// supersets of others and can be used in place of the other.
for (Function::const_iterator
I = CalledFunc->begin(), E = CalledFunc->end(); I != E; ++I)
if (const InvokeInst *II = dyn_cast<InvokeInst>(I->getTerminator())) {
const BasicBlock *BB = II->getUnwindDest();
// FIXME: This 'if/dyn_cast' here should become a normal 'cast' once
// the new EH system is in place.
if (const LandingPadInst *LP =
dyn_cast<LandingPadInst>(BB->getFirstNonPHI()))
if (CallerPersFn != LP->getPersonalityFn())
return false;
break;
}
// If the personality functions match, then we can perform the
// inlining. Otherwise, we can't inline.
// TODO: This isn't 100% true. Some personality functions are proper
// supersets of others and can be used in place of the other.
if (LP->getPersonalityFn() != CalleePersonality)
return false;
break;
}
break;
}
// Get an iterator to the last basic block in the function, which will have
// the new function inlined after it.