28.6.2. GCC inline assembly scratch registers
How to use temporary registers in inline assembly:
Bibliography: https://stackoverflow.com/questions/6682733/gcc-prohibit-use-of-some-registers/54963829#54963829
How to use temporary registers in inline assembly:
Bibliography: https://stackoverflow.com/questions/6682733/gcc-prohibit-use-of-some-registers/54963829#54963829