[PATCH 1/8] riscv: Optimize source end address calculation in start.S

[Bin Meng]

On Thu, Mar 30, 2023 at 8:36 PM Bin Meng <bmeng at tinylab.org> wrote:
>
> The __bss_start is the source end address hence load its address
> directly into register 't2' for optimization.
>
> Signed-off-by: Bin Meng <bmeng at tinylab.org>
> ---
>
>  arch/riscv/cpu/start.S | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S
> index 4687bca3c9..3c8344c345 100644
> --- a/arch/riscv/cpu/start.S
> +++ b/arch/riscv/cpu/start.S
> @@ -283,9 +283,7 @@ stack_setup:
>         beq     t0, s4, clear_bss       /* skip relocation */
>
>         mv      t1, s4                  /* t1 <- scratch for copy_loop */
> -       la      t3, __bss_start
> -       sub     t3, t3, t0              /* t3 <- __bss_start_ofs */
> -       add     t2, t0, t3              /* t2 <- source end address */
> +       la      t2, __bss_start         /* t2 <- source end address */
>
>  copy_loop:
>         LREG    t5, 0(t0)
> --

Ping for this series?