Array accesses are independent if the underlying arrays differ.

llvm-svn: 74499

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/test/Analysis/LoopDependenceAnalysis/local-array.ll b/llvm/test/Analysis/LoopDependenceAnalysis/local-array.ll
new file mode 100644
index 00000000000..c42e0fad438
--- /dev/null
+++ b/llvm/test/Analysis/LoopDependenceAnalysis/local-array.ll
@@ -0,0 +1,24 @@
+; RUN: llvm-as < %s | opt -disable-output -analyze -lda > %t
+; RUN: grep {instructions: 2} %t | count 1
+; RUN: grep {0,1: dependent} %t | count 1
+
+; x[5] = x[6] // with x being an array on the stack
+
+define void @foo(...) nounwind {
+entry:
+  %xptr = alloca [256 x i32], align 4
+  %x.ld.addr = getelementptr [256 x i32]* %xptr, i64 0, i64 6
+  %x.st.addr = getelementptr [256 x i32]* %xptr, i64 0, i64 5
+  br label %for.body
+
+for.body:
+  %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
+  %x = load i32* %x.ld.addr
+  store i32 %x, i32* %x.st.addr
+  %i.next = add i64 %i, 1
+  %exitcond = icmp eq i64 %i.next, 256
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:
+  ret void
+}