--- /dev/null
+; RUN: opt -S -loop-unroll -unroll-runtime < %s | FileCheck %s
+
+; Epilog unroll allows to keep PHI constant value.
+; For the test this means that after unroll XOR could be deleted.
+; Check that we do epilogue reminder here.
+
+; CHECK-LABEL: const_phi_val
+; CHECK: for.body.epil
+
+; Function Attrs: norecurse nounwind uwtable
+define void @const_phi_val(i32 %i0, i32* nocapture %a) {
+entry:
+ %cmp6 = icmp slt i32 %i0, 1000
+ br i1 %cmp6, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %tmp = sext i32 %i0 to i64
+ br label %for.body
+
+for.body: ; preds = %for.body, %for.body.preheader
+ %indvars.iv = phi i64 [ %tmp, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
+ %s.08 = phi i32 [ 0, %for.body.preheader ], [ %xor, %for.body ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
+ store i32 %s.08, i32* %arrayidx, align 4
+ %xor = xor i32 %s.08, 1
+ %indvars.iv.next = add nsw i64 %indvars.iv, 1
+ %exitcond = icmp eq i64 %indvars.iv.next, 1000
+ br i1 %exitcond, label %for.end.loopexit, label %for.body
+
+for.end.loopexit: ; preds = %for.body
+ br label %for.end
+
+for.end: ; preds = %for.end.loopexit, %entry
+ ret void
+}
+
+; When there is no phi with const coming from preheader,
+; there is no need to do epilogue unrolling.
+
+; CHECK-LABEL: var_phi_val
+; CHECK: for.body.prol
+
+; Function Attrs: norecurse nounwind uwtable
+define void @var_phi_val(i32 %i0, i32* nocapture %a) {
+entry:
+ %cmp6 = icmp slt i32 %i0, 1000
+ br i1 %cmp6, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %tmp = sext i32 %i0 to i64
+ br label %for.body
+
+for.body: ; preds = %for.body, %for.body.preheader
+ %indvars.iv = phi i64 [ %tmp, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
+ %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
+ %indvars.iv.next = add nsw i64 %indvars.iv, 1
+ %exitcond = icmp eq i64 %indvars.iv.next, 1000
+ br i1 %exitcond, label %for.end.loopexit, label %for.body
+
+for.end.loopexit: ; preds = %for.body
+ br label %for.end
+
+for.end: ; preds = %for.end.loopexit, %entry
+ ret void
+}