Index: llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
===================================================================
--- llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
+++ llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
@@ -263,9 +263,6 @@
     if (ICmpInst::isEquality(Pred) &&
         !SE.isKnownPredicate(ICmpInst::getInversePredicate(Pred), NextIterVal,
                              RightSCEV)) {
-      assert(!SE.isKnownPredicate(Pred, IterVal, RightSCEV) &&
-             SE.isKnownPredicate(Pred, NextIterVal, RightSCEV) &&
-             "Expected Pred to go from known to unknown.");
       if (!CanPeelOneMoreIteration())
         continue; // Need to peel one more iteration, but can't. Give up.
       PeelOneMoreIteration(); // Great!
Index: llvm/test/Transforms/LoopUnroll/wrong_assert_in_peeling.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/LoopUnroll/wrong_assert_in_peeling.ll
@@ -0,0 +1,49 @@
+; RUN: opt -S < %s -loop-unroll | FileCheck %s
+; RUN: opt -S < %s -passes=unroll | FileCheck %s
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128-ni:1-p2:32:8:8:32-ni:2"
+target triple = "x86_64-unknown-linux-gnu"
+
+define i32 @test() {
+; CHECK-LABEL: test
+bb:
+  br label %bb1
+
+bb1:                                              ; preds = %bb13, %bb
+  %tmp = phi i32 [ -147, %bb ], [ %tmp14, %bb13 ]
+  br label %bb2
+
+bb2:                                              ; preds = %bb12, %bb1
+  %tmp3 = phi i32 [ undef, %bb1 ], [ %tmp4, %bb12 ]
+  %tmp4 = add nsw i32 %tmp3, %tmp
+  br label %bb5
+
+bb5:                                              ; preds = %bb2
+  %tmp6 = icmp eq i32 undef, 33
+  br i1 %tmp6, label %bb7, label %bb15
+
+bb7:                                              ; preds = %bb5
+  %tmp8 = sub nsw i32 %tmp3, undef
+  %tmp9 = icmp eq i32 %tmp8, 0
+  br i1 %tmp9, label %bb10, label %bb10
+
+bb10:                                             ; preds = %bb7, %bb7
+  %tmp11 = icmp eq i8 undef, 0
+  br i1 %tmp11, label %bb12, label %bb17
+
+bb12:                                             ; preds = %bb10
+  br i1 false, label %bb13, label %bb2
+
+bb13:                                             ; preds = %bb12
+  %tmp14 = add nsw i32 %tmp, -1
+  br label %bb1
+
+bb15:                                             ; preds = %bb5
+  %tmp16 = call i32 (...) @llvm.experimental.deoptimize.i32(i32 17) [ "deopt"() ]
+  ret i32 %tmp16
+
+bb17:                                             ; preds = %bb10
+  %tmp18 = call i32 (...) @llvm.experimental.deoptimize.i32(i32 6) [ "deopt"() ]
+  ret i32 %tmp18
+}
+
+declare i32 @llvm.experimental.deoptimize.i32(...)