1 files changed, 26 insertions, 0 deletions
diff --git a/test/Transforms/LoopVectorize/loop-vect-memdep.ll b/test/Transforms/LoopVectorize/loop-vect-memdep.ll
new file mode 100644
index 0000000..e2c7524
--- /dev/null
+++ b/test/Transforms/LoopVectorize/loop-vect-memdep.ll
@@ -0,0 +1,26 @@
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+; RUN: opt < %s -S -loop-vectorize -debug-only=loop-vectorize 2>&1 | FileCheck %s
+; REQUIRES: asserts
+; CHECK: LV: Can't vectorize due to memory conflicts
+
+define void @test_loop_novect(double** %arr, i64 %n) {
+for.body.lr.ph:
+  %t = load double** %arr, align 8
+  br label %for.body
+
+for.body:                                      ; preds = %for.body, %for.body.lr.ph
+  %i = phi i64 [ 0, %for.body.lr.ph ], [ %i.next, %for.body ]
+  %a = getelementptr inbounds double* %t, i64 %i
+  %i.next = add nuw nsw i64 %i, 1
+  %a.next = getelementptr inbounds double* %t, i64 %i.next
+  %t1 = load double* %a, align 8
+  %t2 = load double* %a.next, align 8
+  store double %t1, double* %a.next, align 8
+  store double %t2, double* %a, align 8
+  %c = icmp eq i64 %i, %n
+  br i1 %c, label %final, label %for.body
+
+final:                                   ; preds = %for.body
+  ret void
+}