Add a mechanism for invalidating the LiveOutInfo of a PHI, and use it whenever
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
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 9d3f5bc..d540063 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -832,8 +832,25 @@
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();