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Add a mechanism for invalidating the LiveOutInfo of a PHI, and use it whenever

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a block is visited before all of its predecessors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126378 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich
2011-02-24 10:00:16 +00:00
parent a46cd97818
commit 324a24f6aa
2 changed files with 36 additions and 4 deletions
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19
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@@ -832,8 +832,25 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
CheckLineNumbers(LLVMBB);
#endif
if (OptLevel != CodeGenOpt::None)
if (OptLevel != CodeGenOpt::None) {
bool AllPredsVisited = true;
for (const_pred_iterator PI = pred_begin(LLVMBB), PE = pred_end(LLVMBB);
PI != PE; ++PI) {
if (!FuncInfo->VisitedBBs.count(*PI)) {
AllPredsVisited = false;
break;
}
}
if (!AllPredsVisited) {
for (BasicBlock::const_iterator I = LLVMBB->begin(), E = LLVMBB->end();
I != E && isa<PHINode>(I); ++I) {
FuncInfo->InvalidatePHILiveOutRegInfo(cast<PHINode>(I));
}
}
FuncInfo->VisitedBBs.insert(LLVMBB);
}
FuncInfo->MBB = FuncInfo->MBBMap[LLVMBB];
FuncInfo->InsertPt = FuncInfo->MBB->getFirstNonPHI();