Fix PR25838.
This is a quick fix to PR25838. The issue comes from the restriction that we
cannot normalize probabilities containing both known and unknown ones. A patch
that removes this restriction is under the review now:
http://reviews.llvm.org/D15548
llvm-svn: 255867
diff --git a/llvm/lib/CodeGen/IfConversion.cpp b/llvm/lib/CodeGen/IfConversion.cpp
index a1835fa..c38c9d2 100644
--- a/llvm/lib/CodeGen/IfConversion.cpp
+++ b/llvm/lib/CodeGen/IfConversion.cpp
@@ -1662,6 +1662,12 @@
ToBBI.BB->splice(ToBBI.BB->end(),
FromBBI.BB, FromBBI.BB->begin(), FromBBI.BB->end());
+ // Force normalizing the successors' probabilities of ToBBI.BB to convert all
+ // unknown probabilities into known ones.
+ // FIXME: This usage is too tricky and in the future we would like to
+ // eliminate all unknown probabilities in MBB.
+ ToBBI.BB->normalizeSuccProbs();
+
SmallVector<MachineBasicBlock *, 4> FromSuccs(FromBBI.BB->succ_begin(),
FromBBI.BB->succ_end());
MachineBasicBlock *NBB = getNextBlock(FromBBI.BB);