Fix a bug in IfConversion.cpp.

The bug is introduced in r254377 which failed some tests on ARM, where a new
probability is assigned to a successor but the provided BB may not be a
successor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254463 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/IfConversion.cpp b/lib/CodeGen/IfConversion.cpp
index ff28f95cc33de8b4b682744f1fb5a69c5386412b..e90cb02bd2804c821effc0d31b443783bdd65482 100644 (file)
--- a/lib/CodeGen/IfConversion.cpp
+++ b/lib/CodeGen/IfConversion.cpp
@@ -1254,9 +1254,8 @@ bool IfConverter::IfConvertTriangle(BBInfo &BBI, IfcvtKind Kind) {
     auto NewNext = BBNext + BBCvt * CvtNext;
     auto NewTrueBBIter =
         std::find(BBI.BB->succ_begin(), BBI.BB->succ_end(), NewTrueBB);
     auto NewNext = BBNext + BBCvt * CvtNext;
     auto NewTrueBBIter =
         std::find(BBI.BB->succ_begin(), BBI.BB->succ_end(), NewTrueBB);

-    assert(NewTrueBBIter != BBI.BB->succ_end() &&
-           "NewTrueBB is not a successor of BBI.BB.");
-    BBI.BB->setSuccProbability(NewTrueBBIter, NewNext);
+    if (NewTrueBBIter != BBI.BB->succ_end())
+      BBI.BB->setSuccProbability(NewTrueBBIter, NewNext);

 
     auto NewFalse = BBCvt * CvtFalse;
     TII->InsertBranch(*BBI.BB, CvtBBI->FalseBB, nullptr, RevCond, dl);
 
     auto NewFalse = BBCvt * CvtFalse;
     TII->InsertBranch(*BBI.BB, CvtBBI->FalseBB, nullptr, RevCond, dl);