new testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9064 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LoopSimplify/single-backedge.ll b/test/Transforms/LoopSimplify/single-backedge.ll
new file mode 100644 (file)
index 0000000..63fa33a
--- /dev/null
+++ b/test/Transforms/LoopSimplify/single-backedge.ll
@@ -0,0 +1,17 @@
+; The loop canonicalization pass should guarantee that there is one backedge 
+; for all loops.  This allows the -indvars pass to recognize the %IV 
+; induction variable in this testcase.
+
+; RUN: llvm-as < %s | opt -indvars | llvm-dis | grep indvar
+
+int %test(bool %C) {
+       br label %Loop
+Loop:
+       %IV = phi uint [0, %0], [%IV2, %BE1], [%IV2, %BE2]
+       %IV2 = add uint %IV, 2
+       br bool %C, label %BE1, label %BE2
+BE1:
+       br label %Loop
+BE2:
+       br label %Loop
+}