1 files changed, 43 insertions, 0 deletions
diff --git a/test/Analysis/LoopAccessAnalysis/safe-no-checks.ll b/test/Analysis/LoopAccessAnalysis/safe-no-checks.ll
new file mode 100644
index 0000000..fa70c02
--- /dev/null
+++ b/test/Analysis/LoopAccessAnalysis/safe-no-checks.ll
@@ -0,0 +1,43 @@
+; RUN: opt -basicaa -loop-accesses -analyze < %s | FileCheck %s
+
+; If the arrays don't alias this loop is safe with no memchecks:
+;   for (i = 0; i < n; i++)
+;    A[i] = A[i+1] * B[i] * C[i];
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.10.0"
+
+; CHECK: Memory dependences are safe{{$}}
+
+define void @f(i16* noalias %a,
+               i16* noalias %b,
+               i16* noalias %c) {
+entry:
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
+
+  %add = add nuw nsw i64 %ind, 1
+
+  %arrayidxA_plus_2 = getelementptr inbounds i16, i16* %a, i64 %add
+  %loadA_plus_2 = load i16, i16* %arrayidxA_plus_2, align 2
+
+  %arrayidxB = getelementptr inbounds i16, i16* %b, i64 %ind
+  %loadB = load i16, i16* %arrayidxB, align 2
+
+  %arrayidxC = getelementptr inbounds i16, i16* %c, i64 %ind
+  %loadC = load i16, i16* %arrayidxC, align 2
+
+  %mul = mul i16 %loadB, %loadA_plus_2
+  %mul1 = mul i16 %mul, %loadC
+
+  %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %ind
+  store i16 %mul1, i16* %arrayidxA, align 2
+
+  %exitcond = icmp eq i64 %add, 20
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body
+  ret void
+}