Regarding an MCU with RISC-V. I have this MCU: RV32IMAC with 32 internal registers, including temporary registers (t0-t6), argument/return registers (a0-a1), and argument registers (a2-a7).
What would happen or what problems would one encounter if only t-registers were available, without any a-registers? I know C, so comparisons can be related to the programming language.