On Mon, Dec 09, 2019 at 11:17:30AM +0000, Russell King wrote:
> Improve the prologue code sequence to be able to take advantage of
> 64-bit stores, changing the code from:
>
> push {r4, r5, r6, r7, r8, r9, fp, lr}
> mov fp, sp
> sub ip, sp, #80 ; 0x50
> sub sp, sp, #600 ; 0x258
> str ip, [fp, #-100] ; 0xffffff9c
> mov r6, #0
> str r6, [fp, #-96] ; 0xffffffa0
> mov r4, #0
> mov r3, r4
> mov r2, r0
> str r4, [fp, #-104] ; 0xffffff98
> str r4, [fp, #-108] ; 0xffffff94
>
> to the tighter:
>
> push {r4, r5, r6, r7, r8, r9, fp, lr}
> mov fp, sp
> mov r3, #0
> sub r2, sp, #80 ; 0x50
> sub sp, sp, #600 ; 0x258
> strd r2, [fp, #-100] ; 0xffffff9c
> mov r2, #0
> strd r2, [fp, #-108] ; 0xffffff94
> mov r2, r0
>
> resulting in a saving of three instructions.
>
> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Applied, thanks!
