1 files changed, 30 insertions, 0 deletions
diff --git a/test/Analysis/ScalarEvolution/scev-expander-incorrect-nowrap.ll b/test/Analysis/ScalarEvolution/scev-expander-incorrect-nowrap.ll
new file mode 100644
index 0000000..012cad7
--- /dev/null
+++ b/test/Analysis/ScalarEvolution/scev-expander-incorrect-nowrap.ll
@@ -0,0 +1,30 @@
+; RUN: opt -indvars -S < %s | FileCheck %s
+
+declare void @use(i32)
+declare void @use.i8(i8)
+
+define void @f() {
+; CHECK-LABEL: @f
+ entry:
+  br label %loop
+
+ loop:
+; The only use for idx.mirror is to induce an nuw for %idx.  It does
+; not induce an nuw for %idx.inc
+  %idx.mirror = phi i8 [ -6, %entry ], [ %idx.mirror.inc, %loop ]
+  %idx = phi i8 [ -5, %entry ], [ %idx.inc, %loop ]
+
+  %idx.sext = sext i8 %idx to i32
+  call void @use(i32 %idx.sext)
+
+  %idx.mirror.inc = add nuw i8 %idx.mirror, 1
+  call void @use.i8(i8 %idx.mirror.inc)
+
+  %idx.inc = add i8 %idx, 1
+; CHECK-NOT: %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
+  %cmp = icmp ugt i8 %idx.inc, 0
+  br i1 %cmp, label %loop, label %exit
+
+ exit:
+  ret void
+}