Calling register files (or register renaming) the same as register windows, is a significant stretch. Renaming is important for OoO execution, register windows

Calling register files (or register renaming) the same as register windows, is a significant stretch. Renaming is important for OoO execution, register windows were used (in the original risc and sparc) to paper over the lack of a good register allocator. Later EPIC used a variant of it for software pipelining.