Add a simple testcase for garbage collection support

llvm-svn: 13697

llvm/test/Regression/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()