1 files changed, 54 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopVersioning/noalias.ll b/llvm/test/Transforms/LoopVersioning/noalias.ll
new file mode 100644
index 00000000000..c2539726db4
--- /dev/null
+++ b/llvm/test/Transforms/LoopVersioning/noalias.ll
@@ -0,0 +1,54 @@
+; RUN: opt -basicaa -loop-versioning -S < %s | FileCheck %s
+
+; A very simple case.  After versioning the %loadA and %loadB can't alias with
+; the store.
+;
+; To see it easier what's going on, I expanded every noalias/scope metadata
+; reference below in a comment.  For a scope I use the format scope(domain),
+; e.g. scope 17 in domain 15 is written as 17(15).
+
+; CHECK-LABEL: @f(
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @f(i32* %a, i32* %b, i32* %c) {
+entry:
+  br label %for.body
+
+; CHECK: for.body.lver.orig:
+; CHECK: for.body:
+for.body:                                         ; preds = %for.body, %entry
+  %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
+
+  %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind
+; CHECK: %loadA = {{.*}} !alias.scope !0
+; A's scope: !0 -> { 1(2) }
+  %loadA = load i32, i32* %arrayidxA, align 4
+
+  %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind
+; CHECK: %loadB = {{.*}} !alias.scope !3
+; B's scope: !3 -> { 4(2) }
+  %loadB = load i32, i32* %arrayidxB, align 4
+
+  %mulC = mul i32 %loadA, %loadB
+
+  %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind
+; CHECK: store {{.*}} !alias.scope !5, !noalias !7
+; C noalias A and B: !7 -> { 1(2), 4(2) }
+  store i32 %mulC, i32* %arrayidxC, align 4
+
+  %add = add nuw nsw i64 %ind, 1
+  %exitcond = icmp eq i64 %add, 20
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body
+  ret void
+}
+; CHECK: !0 = !{!1}
+; CHECK: !1 = distinct !{!1, !2}
+; CHECK: !2 = distinct !{!2, !"LVerDomain"}
+; CHECK: !3 = !{!4}
+; CHECK: !4 = distinct !{!4, !2}
+; CHECK: !5 = !{!6}
+; CHECK: !6 = distinct !{!6, !2}
+; CHECK: !7 = !{!1, !4}