1 files changed, 78 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopVectorize/noalias-md.ll b/llvm/test/Transforms/LoopVectorize/noalias-md.ll
new file mode 100644
index 00000000000..787ea88f945
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/noalias-md.ll
@@ -0,0 +1,78 @@
+; RUN: opt -basicaa -loop-vectorize -force-vector-width=2 \
+; RUN:     -force-vector-interleave=1 -S < %s \
+; RUN:     | FileCheck %s -check-prefix=BOTH -check-prefix=LV
+; RUN: opt -basicaa -scoped-noalias -loop-vectorize -dse -force-vector-width=2 \
+; RUN:     -force-vector-interleave=1 -S < %s \
+; RUN:     | FileCheck %s -check-prefix=BOTH -check-prefix=DSE
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+
+; This loop needs to be versioned with memchecks between {A, B} x {C} before
+; it can be vectorized.
+;
+;   for (i = 0; i < n; i++) {
+;     C[i] = A[i] + 1;
+;     C[i] += B[i];
+;   }
+;
+; Check that the corresponding noalias metadata is added to the vector loop
+; but not to the scalar loop.
+;
+; Since in the versioned vector loop C and B can no longer alias, the first
+; store to C[i] can be DSE'd.
+
+
+define void @f(i32* %a, i32* %b, i32* %c) {
+entry:
+  br label %for.body
+
+; BOTH: vector.memcheck:
+; BOTH: vector.body:
+for.body:                                         ; preds = %for.body, %entry
+  %ind = phi i64 [ 0, %entry ], [ %inc, %for.body ]
+
+  %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind
+; Scope 1
+; LV: = load {{.*}} !alias.scope !0
+  %loadA = load i32, i32* %arrayidxA, align 4
+
+  %add = add nuw i32 %loadA, 2
+
+  %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind
+; Noalias with scope 1 and 6
+; LV: store {{.*}} !alias.scope !3, !noalias !5
+; DSE-NOT: store
+  store i32 %add, i32* %arrayidxC, align 4
+
+  %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind
+; Scope 6
+; LV: = load {{.*}} !alias.scope !7
+  %loadB = load i32, i32* %arrayidxB, align 4
+
+  %add2 = add nuw i32 %add, %loadB
+
+; Noalias with scope 1 and 6
+; LV: store {{.*}} !alias.scope !3, !noalias !5
+; DSE: store
+  store i32 %add2, i32* %arrayidxC, align 4
+
+  %inc = add nuw nsw i64 %ind, 1
+  %exitcond = icmp eq i64 %inc, 20
+  br i1 %exitcond, label %for.end, label %for.body
+
+; BOTH: for.body:
+; BOTH-NOT: !alias.scope
+; BOTH-NOT: !noalias
+
+for.end:                                          ; preds = %for.body
+  ret void
+}
+
+; LV: !0 = !{!1}
+; LV: !1 = distinct !{!1, !2}
+; LV: !2 = distinct !{!2, !"LVerDomain"}
+; LV: !3 = !{!4}
+; LV: !4 = distinct !{!4, !2}
+; LV: !5 = !{!1, !6}
+; LV: !6 = distinct !{!6, !2}
+; LV: !7 = !{!6}