Index: lib/Transforms/Utils/LoopUnrollRuntime.cpp
===================================================================
--- lib/Transforms/Utils/LoopUnrollRuntime.cpp
+++ lib/Transforms/Utils/LoopUnrollRuntime.cpp
@@ -491,11 +491,6 @@
   if (Log2_32(Count) > BEWidth)
     return false;
 
-  // If this loop is nested, then the loop unroller changes the code in the
-  // parent loop, so the Scalar Evolution pass needs to be run again.
-  if (Loop *ParentLoop = L->getParentLoop())
-    SE->forgetLoop(ParentLoop);
-
   BasicBlock *Latch = L->getLoopLatch();
 
   // Loop structure is the following:
@@ -685,6 +680,12 @@
     ConnectProlog(L, BECount, Count, PrologExit, PreHeader, NewPreHeader,
                   VMap, DT, LI, PreserveLCSSA);
   }
+
+  // If this loop is nested, then the loop unroller changes the code in the
+  // parent loop, so the Scalar Evolution pass needs to be run again.
+  if (Loop *ParentLoop = L->getParentLoop())
+    SE->forgetLoop(ParentLoop);
+
   NumRuntimeUnrolled++;
   return true;
 }
Index: test/Analysis/ScalarEvolution/scev-expander-existing-value.ll
===================================================================
--- test/Analysis/ScalarEvolution/scev-expander-existing-value.ll
+++ test/Analysis/ScalarEvolution/scev-expander-existing-value.ll
@@ -1,38 +0,0 @@
-; RUN: opt < %s -loop-vectorize -force-vector-width=4 -verify-scev-maps -S |FileCheck %s
-
-; SCEV expansion uses existing value when the SCEV has no AddRec expr.
-; CHECK: select
-; CHECK-NOT: select
-
-@a = common global [1000 x i16] zeroinitializer, align 16
-
-define i32 @foo(i32 %x, i32 %y) {
-entry:
-  %cmp = icmp slt i32 %x, %y
-  %cond = select i1 %cmp, i32 %x, i32 %y
-  %cmp1.10 = icmp sgt i32 %cond, 0
-  br i1 %cmp1.10, label %for.body.lr.ph, label %for.end
-
-for.body.lr.ph:                                   ; preds = %entry
-  %tmp = sext i32 %cond to i64
-  br label %for.body
-
-for.body:                                         ; preds = %for.body, %for.body.lr.ph
-  %indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ]
-  %total.011 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
-  %arrayidx = getelementptr inbounds [1000 x i16], [1000 x i16]* @a, i64 0, i64 %indvars.iv
-  %tmp1 = load i16, i16* %arrayidx, align 2
-  %conv = sext i16 %tmp1 to i32
-  %add = add nsw i32 %conv, %total.011
-  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
-  %cmp1 = icmp slt i64 %indvars.iv.next, %tmp
-  br i1 %cmp1, label %for.body, label %for.end.loopexit
-
-for.end.loopexit:                                 ; preds = %for.body
-  %add.lcssa = phi i32 [ %add, %for.body ]
-  br label %for.end
-
-for.end:                                          ; preds = %for.end.loopexit, %entry
-  %total.0.lcssa = phi i32 [ 0, %entry ], [ %add.lcssa, %for.end.loopexit ]
-  ret i32 %total.0.lcssa
-}
Index: test/Analysis/ScalarEvolution/scev-expander-reuse-unroll.ll
===================================================================
--- test/Analysis/ScalarEvolution/scev-expander-reuse-unroll.ll
+++ test/Analysis/ScalarEvolution/scev-expander-reuse-unroll.ll
@@ -0,0 +1,35 @@
+; RUN: opt < %s -loop-unroll -unroll-runtime -unroll-count=2 -verify-scev-maps -S | FileCheck %s
+
+; Check SCEV expansion uses existing value when unrolling an inner loop with runtime trip count in a loop nest.
+; CHECK-LABEL: @foo(
+; CHECK: select
+; CHECK-NOT: select
+; CHECK: ret
+
+define void @foo(i32 %xfL, i32 %scaleL) local_unnamed_addr {
+entry:
+  br label %for.body
+
+for.body:                                         ; preds = %for.body5, %for.body, %entry
+  %xfL.addr.033 = phi i32 [ %xfL, %entry ], [ %add, %for.body5 ]
+  %add = add nsw i32 %xfL.addr.033, %scaleL
+  %shr = ashr i32 %add, 16
+  %cmp.i = icmp slt i32 0, %shr
+  %.sroa.speculated = select i1 %cmp.i, i32 0, i32 %shr
+  %cmp425 = icmp slt i32 0, %.sroa.speculated
+  br i1 %cmp425, label %for.body5.preheader, label %for.end
+
+for.body5.preheader:                              ; preds = %for.body
+  %tmp0 = sext i32 %.sroa.speculated to i64
+  br label %for.body5
+
+for.body5:                                        ; preds = %for.body5, %for.body5.preheader
+  %indvars.iv = phi i64 [ 0, %for.body5.preheader ], [ %indvars.iv.next, %for.body5 ]
+  %indvars.iv.next = add nsw i64 %indvars.iv, 1
+  %cmp4 = icmp slt i64 %indvars.iv.next, %tmp0
+  br i1 %cmp4, label %for.body5, label %for.body
+
+for.end:
+  ret void
+}
+
Index: test/Analysis/ScalarEvolution/scev-expander-reuse-vect.ll
===================================================================
--- test/Analysis/ScalarEvolution/scev-expander-reuse-vect.ll
+++ test/Analysis/ScalarEvolution/scev-expander-reuse-vect.ll
@@ -0,0 +1,40 @@
+; RUN: opt < %s -loop-vectorize -force-vector-width=4 -verify-scev-maps -S |FileCheck %s
+
+; SCEV expansion uses existing value when the SCEV has no AddRec expr.
+; CHECK-LABEL: @foo(
+; CHECK: select
+; CHECK-NOT: select
+; CHECK: ret
+
+@a = common global [1000 x i16] zeroinitializer, align 16
+
+define i32 @foo(i32 %x, i32 %y) {
+entry:
+  %cmp = icmp slt i32 %x, %y
+  %cond = select i1 %cmp, i32 %x, i32 %y
+  %cmp1.10 = icmp sgt i32 %cond, 0
+  br i1 %cmp1.10, label %for.body.lr.ph, label %for.end
+
+for.body.lr.ph:                                   ; preds = %entry
+  %tmp = sext i32 %cond to i64
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %for.body.lr.ph
+  %indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ]
+  %total.011 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
+  %arrayidx = getelementptr inbounds [1000 x i16], [1000 x i16]* @a, i64 0, i64 %indvars.iv
+  %tmp1 = load i16, i16* %arrayidx, align 2
+  %conv = sext i16 %tmp1 to i32
+  %add = add nsw i32 %conv, %total.011
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %cmp1 = icmp slt i64 %indvars.iv.next, %tmp
+  br i1 %cmp1, label %for.body, label %for.end.loopexit
+
+for.end.loopexit:                                 ; preds = %for.body
+  %add.lcssa = phi i32 [ %add, %for.body ]
+  br label %for.end
+
+for.end:                                          ; preds = %for.end.loopexit, %entry
+  %total.0.lcssa = phi i32 [ 0, %entry ], [ %add.lcssa, %for.end.loopexit ]
+  ret i32 %total.0.lcssa
+}