1 files changed, 38 insertions, 0 deletions
diff --git a/llvm/test/Analysis/ScalarEvolution/scev-expander-existing-value.ll b/llvm/test/Analysis/ScalarEvolution/scev-expander-existing-value.ll
new file mode 100644
index 00000000000..0c1d6766869
--- /dev/null
+++ b/llvm/test/Analysis/ScalarEvolution/scev-expander-existing-value.ll
@@ -0,0 +1,38 @@
+; 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
+}