Le 06/04/2020 à 03:29, Nicholas Piggin a écrit :
Christophe Leroy's on April 6, 2020 3:44 am:
When r3 is not modified, reload it from regs->orig_r3 to free
volatile registers. This avoids a stack frame for the likely part
of syscall_call_exception()
Before : 353 cycles on null_syscall
After
Christophe Leroy's on April 6, 2020 3:44 am:
> When r3 is not modified, reload it from regs->orig_r3 to free
> volatile registers. This avoids a stack frame for the likely part
> of syscall_call_exception()
>
> Before : 353 cycles on null_syscall
> After : 347 cycles on null_syscall
>
> Before
When r3 is not modified, reload it from regs->orig_r3 to free
volatile registers. This avoids a stack frame for the likely part
of syscall_call_exception()
Before : 353 cycles on null_syscall
After : 347 cycles on null_syscall
Before the patch:
c000b4d4 :
c000b4d4: 7c 08 02 a6 mflr
