Add a simple testcase for garbage collection support

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13697 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/Generic/GC/alloc_loop.ll b/test/CodeGen/Generic/GC/alloc_loop.ll
new file mode 100644 (file)
index 0000000..de9d475
--- /dev/null
+++ b/test/CodeGen/Generic/GC/alloc_loop.ll
@@ -0,0 +1,52 @@
+implementation
+
+declare sbyte* %llvm_gc_allocate(uint)
+declare void %llvm_gc_initialize()
+
+declare void %llvm.gcroot(sbyte**, sbyte*)
+declare void %llvm.gcwrite(sbyte*, sbyte**)
+
+int %main() {
+entry:
+       %A = alloca sbyte*
+       %B = alloca sbyte**
+
+       call void %llvm_gc_initialize()
+
+        ;; void *A;
+       call void %llvm.gcroot(sbyte** %A, sbyte* null)
+
+        ;; A = gcalloc(10);
+       %Aptr = call sbyte* %llvm_gc_allocate(uint 10)
+       store sbyte* %Aptr, sbyte** %A
+
+        ;; void **B;
+       %tmp.1 = cast sbyte*** %B to sbyte **
+       call void %llvm.gcroot(sbyte** %tmp.1, sbyte* null)
+
+       ;; B = gcalloc(4);
+       %B = call sbyte* %llvm_gc_allocate(uint 8)
+       %tmp.2 = cast sbyte* %B to sbyte**
+       store sbyte** %tmp.2, sbyte*** %B
+
+       ;; *B = A;
+       %B.1 = load sbyte*** %B
+       %A.1 = load sbyte** %A
+       call void %llvm.gcwrite(sbyte* %A.1, sbyte** %B.1)
+       
+       br label %AllocLoop
+
+AllocLoop:
+       %i = phi uint [ 0, %entry ], [ %indvar.next, %AllocLoop ]
+        ;; Allocated mem: allocated memory is immediately dead.
+       call sbyte* %llvm_gc_allocate(uint 100)
+       
+       %indvar.next = add uint %i, 1
+       %exitcond = seteq uint %indvar.next, 10000000
+       br bool %exitcond, label %Exit, label %AllocLoop
+
+Exit:
+       ret int 0
+}
+
+declare void %__main()