1 files changed, 86 insertions, 0 deletions
diff --git a/test/Analysis/LoopDependenceAnalysis/siv-weak-crossing.ll b/test/Analysis/LoopDependenceAnalysis/siv-weak-crossing.ll
new file mode 100644
index 0000000..eff3644
--- /dev/null
+++ b/test/Analysis/LoopDependenceAnalysis/siv-weak-crossing.ll
@@ -0,0 +1,86 @@
+; RUN: llvm-as < %s | opt -disable-output -analyze -lda | FileCheck %s
+
+@x = common global [256 x i32] zeroinitializer, align 4
+@y = common global [256 x i32] zeroinitializer, align 4
+
+; for (i = 0; i < 256; i++)
+;   x[i] = x[256 - i] + y[i]
+
+define void @f1(...) nounwind {
+entry:
+  br label %for.body
+
+for.body:
+  %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
+  %i.256 = sub i64 256, %i
+  %y.ld.addr = getelementptr [256 x i32]* @y, i64 0, i64 %i.256
+  %x.ld.addr = getelementptr [256 x i32]* @x, i64 0, i64 %i
+  %x.st.addr = getelementptr [256 x i32]* @x, i64 0, i64 %i
+  %x = load i32* %x.ld.addr     ; 0
+  %y = load i32* %y.ld.addr     ; 1
+  %r = add i32 %y, %x
+  store i32 %r, i32* %x.st.addr ; 2
+; CHECK: 0,2: dep
+; CHECK: 1,2: ind
+  %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
+}
+
+; // the same example, using more realistic IR
+; for (i = 0; i < 256; i++)
+;   x[i] = x[256 - i] + y[i]
+
+define void @f2(...) nounwind {
+entry:
+  br label %for.body
+
+for.body:
+  %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
+  %i.256 = sub i64 0, %i
+  %y.ld.addr = getelementptr [256 x i32]* @y, i64 0, i64 %i
+  %x.ld.addr = getelementptr [256 x i32]* @x, i64 1, i64 %i.256
+  %x.st.addr = getelementptr [256 x i32]* @x, i64 0, i64 %i
+  %x = load i32* %x.ld.addr     ; 0
+  %y = load i32* %y.ld.addr     ; 1
+  %r = add i32 %y, %x
+  store i32 %r, i32* %x.st.addr ; 2
+; CHECK: 0,2: dep
+; CHECK: 1,2: ind
+  %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
+}
+
+; for (i = 0; i < 100; i++)
+;   x[i] = x[256 - i] + y[i]
+
+define void @f3(...) nounwind {
+entry:
+  br label %for.body
+
+for.body:
+  %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
+  %i.256 = sub i64 0, %i
+  %y.ld.addr = getelementptr [256 x i32]* @y, i64 0, i64 %i
+  %x.ld.addr = getelementptr [256 x i32]* @x, i64 1, i64 %i.256
+  %x.st.addr = getelementptr [256 x i32]* @x, i64 0, i64 %i
+  %x = load i32* %x.ld.addr     ; 0
+  %y = load i32* %y.ld.addr     ; 1
+  %r = add i32 %y, %x
+  store i32 %r, i32* %x.st.addr ; 2
+; CHECK: 0,2: dep
+; CHECK: 1,2: ind
+  %i.next = add i64 %i, 1
+  %exitcond = icmp eq i64 %i.next, 100
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:
+  ret void
+}