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Only apply the devirtualization bonus once instead of per-call site in the

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target function.

Fixes part of rdar://8546196


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124044 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2011-01-22 21:17:33 +00:00
parent 8184e289db
commit 7020f12ee8
1 changed files with 6 additions and 2 deletions
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8
lib/Analysis/InlineCost.cpp
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@ -146,17 +146,18 @@ void CodeMetrics::analyzeBasicBlock(const BasicBlock *BB) {
// performance boost we can expect if the specified value is constant.
unsigned CodeMetrics::CountBonusForConstant(Value *V) {
unsigned Bonus = 0;
bool indirectCallBonus = false;
for (Value::use_iterator UI = V->use_begin(), E = V->use_end(); UI != E;++UI){
User *U = *UI;
if (CallInst *CI = dyn_cast<CallInst>(U)) {
// Turning an indirect call into a direct call is a BIG win
if (CI->getCalledValue() == V)
Bonus += InlineConstants::IndirectCallBonus;
indirectCallBonus = true;
}
else if (InvokeInst *II = dyn_cast<InvokeInst>(U)) {
// Turning an indirect call into a direct call is a BIG win
if (II->getCalledValue() == V)
Bonus += InlineConstants::IndirectCallBonus;
indirectCallBonus = true;
}
// FIXME: Eliminating conditional branches and switches should
// also yield a per-call performance boost.
@ -187,6 +188,9 @@ unsigned CodeMetrics::CountBonusForConstant(Value *V) {
Bonus += CountBonusForConstant(&Inst);
}
}
if (indirectCallBonus) Bonus += InlineConstants::IndirectCallBonus;
return Bonus;
}