diff --git a/llvm/include/llvm/Transforms/Utils/CodeExtractor.h b/llvm/include/llvm/Transforms/Utils/CodeExtractor.h
--- a/llvm/include/llvm/Transforms/Utils/CodeExtractor.h
+++ b/llvm/include/llvm/Transforms/Utils/CodeExtractor.h
@@ -106,6 +106,11 @@
     /// returns false.
     Function *extractCodeRegion();
 
+    /// Verify that assumption cache isn't stale after a region is extracted.
+    /// Returns false when verifier finds errors. AssumptionCache is passed as
+    /// parameter to make this function stateless.
+    static bool verifyAssumptionCache(const Function& F, AssumptionCache *AC);
+
     /// Test whether this code extractor is eligible.
     ///
     /// Based on the blocks used when constructing the code extractor,
diff --git a/llvm/lib/Transforms/Utils/CodeExtractor.cpp b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
--- a/llvm/lib/Transforms/Utils/CodeExtractor.cpp
+++ b/llvm/lib/Transforms/Utils/CodeExtractor.cpp
@@ -1568,5 +1568,17 @@
   });
   LLVM_DEBUG(if (verifyFunction(*oldFunction))
              report_fatal_error("verification of oldFunction failed!"));
+  LLVM_DEBUG(if (AC && verifyAssumptionCache(*oldFunction, AC))
+             report_fatal_error("Stale Asumption cache for old Function!"));
   return newFunction;
 }
+
+bool CodeExtractor::verifyAssumptionCache(const Function& F,
+                                          AssumptionCache *AC) {
+  for (auto AssumeVH : AC->assumptions()) {
+    CallInst *I = cast<CallInst>(AssumeVH);
+    if (I->getParent()->getParent() != &F)
+      return true;
+  }
+  return false;
+}
diff --git a/llvm/test/Transforms/HotColdSplit/assumption-cache-invalidation.ll b/llvm/test/Transforms/HotColdSplit/assumption-cache-invalidation.ll
--- a/llvm/test/Transforms/HotColdSplit/assumption-cache-invalidation.ll
+++ b/llvm/test/Transforms/HotColdSplit/assumption-cache-invalidation.ll
@@ -1,4 +1,5 @@
-; RUN: opt -instcombine -hotcoldsplit -instsimplify %s -o /dev/null
+; REQUIRES: asserts
+; RUN: opt -instcombine -hotcoldsplit -instsimplify -debug %s -o /dev/null
 
 target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
 target triple = "aarch64"