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sched: Be explicit with loading of the waketime variable

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Explicilty load the timer waketime variable into local variables in
sched_timer_kick().  Change the optimization level from Os to O2.
This helps gcc to avoid unnecessary reloads from memory in the common
stepper_event() case.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-03-21 01:21:23 -04:00
parent 4dfa6c6ee4
commit 59b71d5d05
6 changed files with 26 additions and 26 deletions
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42
src/sched.c
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@ -122,55 +122,55 @@ sched_del_timer(struct timer *del)
irq_restore(flag);
}
// Move a rescheduled timer to its new location in the list. Returns
// the next timer to run.
static struct timer *
reschedule_timer(struct timer *t)
// Move a rescheduled timer to its new location in the list.
static void
reschedule_timer(struct timer *t, uint32_t updated_waketime)
{
uint32_t waketime = t->waketime;
struct timer *pos = t->next;
if (timer_is_before(waketime, pos->waketime))
// Timer is still the first - no insertion needed
return t;
// Find new timer position and update list
struct timer *pos = t->next, *prev;
timer_list = pos;
struct timer *prev;
for (;;) {
prev = pos;
if (CONFIG_MACH_AVR)
// micro optimization for AVR - reduces register pressure
asm("" : "+r"(prev) : : "memory");
asm("" : "+r"(prev));
pos = pos->next;
if (timer_is_before(waketime, pos->waketime))
if (timer_is_before(updated_waketime, pos->waketime))
break;
}
t->next = pos;
prev->next = t;
return timer_list;
}
// Invoke timers - called from board timer irq code.
void
sched_timer_kick(void)
{
struct timer *t = timer_list;
for (;;) {
// Invoke timer callback
struct timer *t = timer_list;
uint_fast8_t res;
if (CONFIG_INLINE_STEPPER_HACK && likely(!t->func))
uint32_t updated_waketime;
if (CONFIG_INLINE_STEPPER_HACK && likely(!t->func)) {
res = stepper_event(t);
else
updated_waketime = t->waketime;
} else {
res = t->func(t);
updated_waketime = t->waketime;
}
// Update timer_list (rescheduling current timer if necessary)
if (unlikely(res == SF_DONE))
unsigned int next_waketime = updated_waketime;
if (unlikely(res == SF_DONE)) {
t = timer_list = t->next;
else
t = reschedule_timer(t);
next_waketime = t->waketime;
} else if (!timer_is_before(updated_waketime, t->next->waketime)) {
next_waketime = t->next->waketime;
reschedule_timer(t, updated_waketime);
}
// Schedule next timer event (or run next timer if it's ready)
res = timer_try_set_next(t->waketime);
res = timer_try_set_next(next_waketime);
if (res)
break;
}