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

On Thu, Mar 30, 2023 at 8:36 PM Bin Meng bmeng@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@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) --

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