diff --git a/llvm/lib/CodeGen/GlobalISel/InstructionSelector.cpp b/llvm/lib/CodeGen/GlobalISel/InstructionSelector.cpp
--- a/llvm/lib/CodeGen/GlobalISel/InstructionSelector.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/InstructionSelector.cpp
@@ -59,6 +59,10 @@
       std::next(MI.getIterator()) == IntoMI.getIterator())
     return true;
 
+  // Convergent instructions cannot be moved in the CFG.
+  if (MI.isConvergent() && MI.getParent() != IntoMI.getParent())
+    return false;
+
   return !MI.mayLoadOrStore() && !MI.mayRaiseFPException() &&
          !MI.hasUnmodeledSideEffects() && MI.implicit_operands().empty();
 }