; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep icmp
; PR1646

@__gthrw_pthread_cancel = alias weak i32 (i32)* @pthread_cancel		; <i32 (i32)*> [#uses=1]
@__gthread_active_ptr.5335 = internal constant i8* bitcast (i32 (i32)* @__gthrw_pthread_cancel to i8*)		; <i8**> [#uses=1]
declare extern_weak i32 @pthread_cancel(i32)

define i1 @__gthread_active_p() {
entry:
	%tmp1 = load i8** @__gthread_active_ptr.5335, align 4		; <i8*> [#uses=1]
	%tmp2 = icmp ne i8* %tmp1, null		; <i1> [#uses=1]
	ret i1 %tmp2
}