Current implementation wastes another register to pass the
argument, but we only need addi to calculate the result. Optimize
the code with minimize the usage of registers.
Signed-off-by: NGuo Ren <guoren@linux.alibaba.com>
Signed-off-by: NGuo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20220505035526.2974382-3-guoren@kernel.orgSigned-off-by: NPalmer Dabbelt <palmer@rivosinc.com>