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[SwitchLowering] Remove quadratic vector removal.

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This can be triggered with giant switches. No functionality change
intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240221 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2015-06-20 15:59:34 +00:00
parent 1e71d7421a
commit 35d21618cb
1 changed files with 12 additions and 12 deletions
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24
lib/Transforms/Utils/LowerSwitch.cpp
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@ -364,9 +364,9 @@ unsigned LowerSwitch::Clusterify(CaseVector& Cases, SwitchInst *SI) {
std::sort(Cases.begin(), Cases.end(), CaseCmp());
// Merge case into clusters
if (Cases.size()>=2)
for (CaseItr I = Cases.begin(), J = std::next(Cases.begin());
J != Cases.end();) {
if (Cases.size() >= 2) {
CaseItr I = Cases.begin();
for (CaseItr J = std::next(I), E = Cases.end(); J != E; ++J) {
int64_t nextValue = J->Low->getSExtValue();
int64_t currentValue = I->High->getSExtValue();
BasicBlock* nextBB = J->BB;
@ -377,11 +377,13 @@ unsigned LowerSwitch::Clusterify(CaseVector& Cases, SwitchInst *SI) {
assert(nextValue > currentValue && "Cases should be strictly ascending");
if ((nextValue == currentValue + 1) && (currentBB == nextBB)) {
I->High = J->High;
J = Cases.erase(J);
} else {
I = J++;
// FIXME: Combine branch weights.
} else if (++I != J) {
*I = *J;
}
}
Cases.erase(std::next(I), Cases.end());
}
for (CaseItr I=Cases.begin(), E=Cases.end(); I!=E; ++I, ++numCmps) {
if (I->Low != I->High)
@ -477,12 +479,10 @@ void LowerSwitch::processSwitchInst(SwitchInst *SI) {
// cases.
assert(MaxPop > 0 && PopSucc);
Default = PopSucc;
for (CaseItr I = Cases.begin(); I != Cases.end();) {
if (I->BB == PopSucc)
I = Cases.erase(I);
else
++I;
}
Cases.erase(std::remove_if(
Cases.begin(), Cases.end(),
[PopSucc](const CaseRange &R) { return R.BB == PopSucc; }),
Cases.end());
// If there are no cases left, just branch.
if (Cases.empty()) {