Do not save registers below r1 stack pointer because
it is not checked by stack undeflow is not able to detect
it.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
It is ancient code. There is possible to save several instructions
just if we use offset instead of addik
Signed-off-by: Michal Simek <monstr@monstr.eu>