In computer science, register transfer language (RTL) is a kind of intermediate representation (IR) that is very close to assembly language, such as that which is used in a compiler. Academic papers and textbooks also often use a form of RTL as an architecture-neutral assembly language. RTL is also the name of a specific IR used in the GNU Compiler Collection (GCC), and several other compilers, such as Zephyr or the European compiler projects CerCo and CompCert.