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handle phi nodes

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llvm-svn: 244273
This commit is contained in:
David Majnemer 2015-08-06 21:08:30 +00:00
parent e7cdbd1fa7
commit 123d7d227a
1 changed files with 27 additions and 4 deletions
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31
lib/CodeGen/WinEHPrepare.cpp
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@ -2980,15 +2980,37 @@ bool WinEHPrepare::prepareExplicitEH(Function &F) {
numberFunclet(CRI->getSuccessor(), EntryBlock);
}
// Strip PHI nodes off of EH pads.
for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE;) {
BasicBlock *BB = FI++;
for (BasicBlock::iterator BI = BB->begin(), BE = BB->end(); BI != BE;) {
if (!BI->isEHPad())
continue;
Instruction *I = BI++;
auto *PN = dyn_cast<PHINode>(I);
if (!PN)
continue;
auto *SpillSlot = new AllocaInst(I->getType(), nullptr,
Twine(I->getName(), ".wineh.phispill"),
EntryBlock->begin());
// Iterate over each operand inserting a store in each predecessor.
for (unsigned i = 0, e = PN->getNumIncomingValues(); i < e; ++i)
new StoreInst(P->getIncomingValue(i), Slot,
P->getIncomingBlock(i)->getTerminator());
}
}
// Turn all inter-funclet uses of a Value into loads and stores.
for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE;) {
BasicBlock *BB = FI++;
std::set<BasicBlock *> &ColorsForBB = BlockColors[BB];
for (BasicBlock::iterator BI = BB->begin(), BE = BB->end(); BI != BE;) {
Instruction *I = BI++;
// Funclets are permitted to use allocas.
if (isa<AllocaInst>(I))
continue;
// Funclets are permitted to use static allocas.
if (auto *AI = dyn_cast<AllocaInst>(I))
if (AI->isStaticAlloca())
continue;
// FIXME: Our spill-placement algorithm is incredibly naive. We should
// try to sink+hoist as much as possible to avoid redundant stores and reloads.
@ -3065,7 +3087,8 @@ bool WinEHPrepare::prepareExplicitEH(Function &F) {
BasicBlock *NewBlock = SplitCriticalEdge(II, SuccNum);
assert(NewBlock && "Unable to split critical edge.");
// Update the color mapping for the newly split edge.
std::set<BasicBlock *> &ColorsForUsingBB = BlockColors[II->getParent()];
std::set<BasicBlock *> &ColorsForUsingBB =
BlockColors[II->getParent()];
BlockColors[NewBlock] = ColorsForUsingBB;
for (BasicBlock *FuncletPad : ColorsForUsingBB)
FuncletBlocks[FuncletPad].insert(NewBlock);