diff --git a/test/Transforms/LoopIdiom/expander-do-not-delete-reused-values.ll b/test/Transforms/LoopIdiom/expander-do-not-delete-reused-values.ll
new file mode 100644
index 00000000000..4a05c44a50f
--- /dev/null
+++ b/test/Transforms/LoopIdiom/expander-do-not-delete-reused-values.ll
@@ -0,0 +1,64 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -loop-idiom -S %s | FileCheck %s
+
+; Make sure we do not delete instructions not inserted during expansion, e.g.
+; because the expande re-used existing instructions.
+
+define void @test(i64 %init, float* %ptr) {
+; CHECK-LABEL: @test(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[OUTER_HEADER:%.*]]
+; CHECK:       outer.header:
+; CHECK-NEXT:    [[J_0:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[OUTER_LATCH:%.*]] ]
+; CHECK-NEXT:    [[I_0:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[ADD:%.*]], [[OUTER_LATCH]] ]
+; CHECK-NEXT:    [[ADD_PTR:%.*]] = getelementptr inbounds float, float* [[PTR:%.*]], i32 [[I_0]]
+; CHECK-NEXT:    br label [[INNER:%.*]]
+; CHECK:       inner:
+; CHECK-NEXT:    [[INNER_IV:%.*]] = phi i64 [ [[INNER_IV_NEXT:%.*]], [[INNER]] ], [ [[INIT:%.*]], [[OUTER_HEADER]] ]
+; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds float, float* [[PTR]], i64 [[INNER_IV]]
+; CHECK-NEXT:    [[TMP0:%.*]] = bitcast float* [[ARRAYIDX]] to i32*
+; CHECK-NEXT:    [[TMP1:%.*]] = load i32, i32* [[TMP0]], align 4
+; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds float, float* [[ADD_PTR]], i64 [[INNER_IV]]
+; CHECK-NEXT:    [[TMP2:%.*]] = bitcast float* [[ARRAYIDX3]] to i32*
+; CHECK-NEXT:    store i32 [[TMP1]], i32* [[TMP2]], align 4
+; CHECK-NEXT:    [[INNER_IV_NEXT]] = add nsw i64 [[INNER_IV]], 1
+; CHECK-NEXT:    [[EC_1:%.*]] = icmp eq i64 [[INNER_IV_NEXT]], 0
+; CHECK-NEXT:    br i1 [[EC_1]], label [[OUTER_LATCH]], label [[INNER]]
+; CHECK:       outer.latch:
+; CHECK-NEXT:    [[INC]] = add nuw nsw i32 [[J_0]], 1
+; CHECK-NEXT:    [[ADD]] = add nuw nsw i32 [[I_0]], [[INC]]
+; CHECK-NEXT:    [[EC_2:%.*]] = icmp eq i32 [[ADD]], 4000
+; CHECK-NEXT:    br i1 [[EC_2]], label [[EXIT:%.*]], label [[OUTER_HEADER]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %outer.header
+
+outer.header:
+  %j.0 = phi i32 [ 0, %entry ], [ %inc, %outer.latch ]
+  %i.0 = phi i32 [ 0, %entry ], [ %add, %outer.latch ]
+  %add.ptr = getelementptr inbounds float, float* %ptr, i32 %i.0
+  br label %inner
+
+inner:
+  %inner.iv = phi i64 [ %inner.iv.next, %inner ], [ %init, %outer.header ]
+  %arrayidx = getelementptr inbounds float, float* %ptr, i64 %inner.iv
+  %0 = bitcast float* %arrayidx to i32*
+  %1 = load i32, i32* %0, align 4
+  %arrayidx3 = getelementptr inbounds float, float* %add.ptr, i64 %inner.iv
+  %2 = bitcast float* %arrayidx3 to i32*
+  store i32 %1, i32* %2, align 4
+  %inner.iv.next = add nsw i64 %inner.iv, 1
+  %ec.1 = icmp eq i64 %inner.iv.next, 0
+  br i1 %ec.1, label %outer.latch, label %inner
+
+outer.latch:
+  %inc = add nuw nsw i32 %j.0, 1
+  %add = add nuw nsw i32 %i.0, %inc
+  %ec.2 = icmp eq i32 %add, 4000
+  br i1 %ec.2, label %exit, label %outer.header
+
+exit:
+  ret void
+}
diff --git a/test/Transforms/LoopStrengthReduce/X86/expander-reused-value-insert-point.ll b/test/Transforms/LoopStrengthReduce/X86/expander-reused-value-insert-point.ll
new file mode 100644
index 00000000000..b84b8842c98
--- /dev/null
+++ b/test/Transforms/LoopStrengthReduce/X86/expander-reused-value-insert-point.ll
@@ -0,0 +1,65 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -loop-reduce -S %s | FileCheck %s
+
+target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.15.0"
+
+declare void @use(double) readnone
+
+; Make sure re-used instructions do not impact the insertion points for SCEV
+; expansion.
+define void @test(double* %ioptr, i32 %X, double* %start, double* %end) {
+; CHECK-LABEL: @test(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[IDX_EXT32:%.*]] = sext i32 [[X:%.*]] to i64
+; CHECK-NEXT:    [[TMP0:%.*]] = shl nsw i64 [[IDX_EXT32]], 3
+; CHECK-NEXT:    [[TMP1:%.*]] = add nsw i64 [[TMP0]], 8
+; CHECK-NEXT:    br label [[FOR_BODY15:%.*]]
+; CHECK:       for.body15:
+; CHECK-NEXT:    br label [[FOR_BODY37:%.*]]
+; CHECK:       for.body37:
+; CHECK-NEXT:    [[P0R_0335:%.*]] = phi double* [ [[ADD_PTR94:%.*]], [[FOR_BODY37]] ], [ [[START:%.*]], [[FOR_BODY15]] ]
+; CHECK-NEXT:    [[ADD_PTR94]] = getelementptr inbounds double, double* [[P0R_0335]], i64 1
+; CHECK-NEXT:    [[P0R_03351:%.*]] = bitcast double* [[P0R_0335]] to i8*
+; CHECK-NEXT:    [[UGLYGEP:%.*]] = getelementptr i8, i8* [[P0R_03351]], i64 [[TMP1]]
+; CHECK-NEXT:    [[UGLYGEP2:%.*]] = bitcast i8* [[UGLYGEP]] to double*
+; CHECK-NEXT:    [[F1I_0:%.*]] = load double, double* [[UGLYGEP2]], align 8
+; CHECK-NEXT:    call void @use(double [[F1I_0]])
+; CHECK-NEXT:    [[EC0:%.*]] = icmp eq double* [[END:%.*]], [[ADD_PTR94]]
+; CHECK-NEXT:    br i1 [[EC0]], label [[FOR_BODY37]], label [[FOR_END_LOOPEXIT:%.*]]
+; CHECK:       for.end.loopexit:
+; CHECK-NEXT:    br label [[FOR_END:%.*]]
+; CHECK:       for.end:
+; CHECK-NEXT:    [[P0R_0_LCSSA:%.*]] = phi double* [ [[ADD_PTR94]], [[FOR_END_LOOPEXIT]] ]
+; CHECK-NEXT:    [[EC1:%.*]] = icmp eq double* [[P0R_0_LCSSA]], [[END]]
+; CHECK-NEXT:    br i1 [[EC1]], label [[FOR_BODY15]], label [[FOR_INC133:%.*]]
+; CHECK:       for.inc133:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %idx.ext32 = sext i32 %X to i64
+  br label %for.body15
+
+for.body15:                                       ; preds = %for.end, %for.body15.lr.ph
+  br label %for.body37
+
+for.body37:                                       ; preds = %for.body37, %for.body37.preheader
+  %p0r.0335 = phi double* [ %add.ptr94, %for.body37 ], [ %start, %for.body15 ]
+  %add.ptr94 = getelementptr inbounds double, double* %p0r.0335, i64 1
+  %f1i.0.in = getelementptr inbounds double, double* %add.ptr94, i64 %idx.ext32
+  %f1i.0 = load double, double* %f1i.0.in, align 8
+  call void @use(double %f1i.0)
+  %ec0 = icmp eq double* %add.ptr94, %end
+  br i1 %ec0, label %for.body37, label %for.end.loopexit
+
+for.end.loopexit:                                 ; preds = %for.body37
+  br label %for.end
+
+for.end:                                          ; preds = %for.end.loopexit, %for.body15
+  %p0r.0.lcssa = phi double* [ %add.ptr94, %for.end.loopexit ]
+  %ec1 = icmp eq double* %p0r.0.lcssa, %end
+  br i1 %ec1, label %for.body15, label %for.inc133
+
+for.inc133:                                       ; preds = %for.end
+  ret void
+}