jump threading can't split a critical edge from an indirectbr. This
fixes PR7356.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105950 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/JumpThreading.cpp b/lib/Transforms/Scalar/JumpThreading.cpp
index 0352c6e..1a64b2c 100644
--- a/lib/Transforms/Scalar/JumpThreading.cpp
+++ b/lib/Transforms/Scalar/JumpThreading.cpp
@@ -870,9 +870,14 @@
// Add all the unavailable predecessors to the PredsToSplit list.
for (pred_iterator PI = pred_begin(LoadBB), PE = pred_end(LoadBB);
- PI != PE; ++PI)
+ PI != PE; ++PI) {
+ // If the predecessor is an indirect goto, we can't split the edge.
+ if (isa<IndirectBrInst>((*PI)->getTerminator()))
+ return false;
+
if (!AvailablePredSet.count(*PI))
PredsToSplit.push_back(*PI);
+ }
// Split them out to their own block.
UnavailablePred =