1 files changed, 48 insertions, 0 deletions
diff --git a/test/Transforms/LoopReroll/negative.ll b/test/Transforms/LoopReroll/negative.ll
new file mode 100644
index 000000000000..36f6806e1c37
--- /dev/null
+++ b/test/Transforms/LoopReroll/negative.ll
@@ -0,0 +1,48 @@
+; RUN: opt -S  -loop-reroll   %s | FileCheck %s
+target triple = "aarch64--linux-gnu"
+@buf = global [16 x i8] c"\0A\0A\0A\0A\0A\0A\0A\0A\0A\0A\0A\0A\0A\0A\0A\0A", align 1
+
+define i32 @test1(i32 %len, i8* nocapture readonly %buf) #0 {
+entry:
+  %cmp.13 = icmp sgt i32 %len, 1
+  br i1 %cmp.13, label %while.body.lr.ph, label %while.end
+
+while.body.lr.ph:                                 ; preds = %entry
+  br label %while.body
+
+while.body:
+;CHECK-LABEL: while.body:
+;CHECK-NEXT:    %indvar = phi i32 [ %indvar.next, %while.body ], [ 0, %while.body.lr.ph ]
+;CHECK-NEXT:    %sum4.015 = phi i64 [ 0, %while.body.lr.ph ], [ %add, %while.body ]
+;CHECK-NOT:     %sub5 = add nsw i32 %len.addr.014, -1
+;CHECK-NOT:     %sub5 = add nsw i32 %len.addr.014, -2
+;CHECK:    br i1 %exitcond, label %while.cond.while.end_crit_edge, label %while.body
+
+  %sum4.015 = phi i64 [ 0, %while.body.lr.ph ], [ %add4, %while.body ]
+  %len.addr.014 = phi i32 [ %len, %while.body.lr.ph ], [ %sub5, %while.body ]
+  %idxprom = sext i32 %len.addr.014 to i64
+  %arrayidx = getelementptr inbounds i8, i8* %buf, i64 %idxprom
+  %0 = load i8, i8* %arrayidx, align 1
+  %conv = zext i8 %0 to i64
+  %add = add i64 %conv, %sum4.015
+  %sub = add nsw i32 %len.addr.014, -1
+  %idxprom1 = sext i32 %sub to i64
+  %arrayidx2 = getelementptr inbounds i8, i8* %buf, i64 %idxprom1
+  %1 = load i8, i8* %arrayidx2, align 1
+  %conv3 = zext i8 %1 to i64
+  %add4 = add i64 %add, %conv3
+  %sub5 = add nsw i32 %len.addr.014, -2
+  %cmp = icmp sgt i32 %sub5, 1
+  br i1 %cmp, label %while.body, label %while.cond.while.end_crit_edge
+
+while.cond.while.end_crit_edge:                   ; preds = %while.body
+  %add4.lcssa = phi i64 [ %add4, %while.body ]
+  %phitmp = trunc i64 %add4.lcssa to i32
+  br label %while.end
+
+while.end:                                        ; preds = %while.cond.while.end_crit_edge, %entry
+  %sum4.0.lcssa = phi i32 [ %phitmp, %while.cond.while.end_crit_edge ], [ 0, %entry ]
+  ret i32 %sum4.0.lcssa
+  unreachable
+}
+