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Merge "Clean up __builtin_expect usage."

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This commit is contained in:
Elliott Hughes 2013-07-16 19:52:30 +00:00 committed by Gerrit Code Review
commit 9562d38df1
4 changed files with 26 additions and 48 deletions
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11
libc/bionic/pthread-rwlocks.c
View file

@ -53,9 +53,6 @@
*
*/
#define __likely(cond) __builtin_expect(!!(cond), 1)
#define __unlikely(cond) __builtin_expect(!!(cond), 0)
#define RWLOCKATTR_DEFAULT 0
#define RWLOCKATTR_SHARED_MASK 0x0010
@ -212,7 +209,7 @@ int pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock)
return EINVAL;
pthread_mutex_lock(&rwlock->lock);
if (__unlikely(!read_precondition(rwlock, __get_thread()->tid)))
if (__predict_false(!read_precondition(rwlock, __get_thread()->tid)))
ret = EBUSY;
else
rwlock->numLocks ++;
@ -230,7 +227,7 @@ int pthread_rwlock_timedrdlock(pthread_rwlock_t *rwlock, const struct timespec *
pthread_mutex_lock(&rwlock->lock);
int tid = __get_thread()->tid;
if (__unlikely(!read_precondition(rwlock, tid))) {
if (__predict_false(!read_precondition(rwlock, tid))) {
rwlock->pendingReaders += 1;
do {
ret = pthread_cond_timedwait(&rwlock->cond, &rwlock->lock, abs_timeout);
@ -260,7 +257,7 @@ int pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock)
pthread_mutex_lock(&rwlock->lock);
int tid = __get_thread()->tid;
if (__unlikely(!write_precondition(rwlock, tid))) {
if (__predict_false(!write_precondition(rwlock, tid))) {
ret = EBUSY;
} else {
rwlock->numLocks ++;
@ -279,7 +276,7 @@ int pthread_rwlock_timedwrlock(pthread_rwlock_t *rwlock, const struct timespec *
pthread_mutex_lock(&rwlock->lock);
int tid = __get_thread()->tid;
if (__unlikely(!write_precondition(rwlock, tid))) {
if (__predict_false(!write_precondition(rwlock, tid))) {
/* If we can't read yet, wait until the rwlock is unlocked
* and try again. Increment pendingReaders to get the
* cond broadcast when that happens.

13
libc/bionic/pthread-timers.c
View file

@ -81,9 +81,6 @@
/* the maximum value of overrun counters */
#define DELAYTIMER_MAX 0x7fffffff
#define __likely(x) __builtin_expect(!!(x),1)
#define __unlikely(x) __builtin_expect(!!(x),0)
typedef struct thr_timer thr_timer_t;
typedef struct thr_timer_table thr_timer_table_t;
@ -294,7 +291,7 @@ static void* timer_thread_start(void*);
int timer_create(clockid_t clock_id, struct sigevent* evp, timer_t* timer_id) {
// If not a SIGEV_THREAD timer, the kernel can handle it without our help.
if (__likely(evp == NULL || evp->sigev_notify != SIGEV_THREAD)) {
if (__predict_true(evp == NULL || evp->sigev_notify != SIGEV_THREAD)) {
return __timer_create(clock_id, evp, timer_id);
}
@ -360,7 +357,7 @@ int timer_create(clockid_t clock_id, struct sigevent* evp, timer_t* timer_id) {
int
timer_delete( timer_t id )
{
if ( __likely(!TIMER_ID_IS_WRAPPED(id)) )
if ( __predict_true(!TIMER_ID_IS_WRAPPED(id)) )
return __timer_delete( id );
else
{
@ -422,7 +419,7 @@ timer_gettime( timer_t id, struct itimerspec* ospec )
return -1;
}
if ( __likely(!TIMER_ID_IS_WRAPPED(id)) ) {
if ( __predict_true(!TIMER_ID_IS_WRAPPED(id)) ) {
return __timer_gettime( id, ospec );
} else {
thr_timer_t* timer = thr_timer_from_id(id);
@ -450,7 +447,7 @@ timer_settime( timer_t id,
return -1;
}
if ( __likely(!TIMER_ID_IS_WRAPPED(id)) ) {
if ( __predict_true(!TIMER_ID_IS_WRAPPED(id)) ) {
return __timer_settime( id, flags, spec, ospec );
} else {
thr_timer_t* timer = thr_timer_from_id(id);
@ -494,7 +491,7 @@ timer_settime( timer_t id,
int
timer_getoverrun(timer_t id)
{
if ( __likely(!TIMER_ID_IS_WRAPPED(id)) ) {
if ( __predict_true(!TIMER_ID_IS_WRAPPED(id)) ) {
return __timer_getoverrun( id );
} else {
thr_timer_t* timer = thr_timer_from_id(id);

47
libc/bionic/pthread.c
View file

@ -56,19 +56,6 @@ int __futex_wait_ex(volatile void *ftx, int pshared, int val, const struct time
return __futex_syscall4(ftx, pshared ? FUTEX_WAIT : FUTEX_WAIT_PRIVATE, val, timeout);
}
#define __likely(cond) __builtin_expect(!!(cond), 1)
#define __unlikely(cond) __builtin_expect(!!(cond), 0)
void*
__get_stack_base(int *p_stack_size)
{
pthread_internal_t* thread = __get_thread();
*p_stack_size = thread->attr.stack_size;
return thread->attr.stack_base;
}
/* CAVEAT: our implementation of pthread_cleanup_push/pop doesn't support C++ exceptions
* and thread cancelation
*/
@ -399,7 +386,7 @@ int pthread_mutex_init(pthread_mutex_t *mutex,
if (mutex == NULL)
return EINVAL;
if (__likely(attr == NULL)) {
if (__predict_true(attr == NULL)) {
mutex->value = MUTEX_TYPE_BITS_NORMAL;
return 0;
}
@ -565,7 +552,7 @@ _recursive_increment(pthread_mutex_t* mutex, int mvalue, int mtype)
for (;;) {
/* increment counter, overflow was already checked */
int newval = mvalue + MUTEX_COUNTER_BITS_ONE;
if (__likely(__bionic_cmpxchg(mvalue, newval, &mutex->value) == 0)) {
if (__predict_true(__bionic_cmpxchg(mvalue, newval, &mutex->value) == 0)) {
/* mutex is still locked, not need for a memory barrier */
return 0;
}
@ -582,7 +569,7 @@ int pthread_mutex_lock_impl(pthread_mutex_t *mutex)
{
int mvalue, mtype, tid, shared;
if (__unlikely(mutex == NULL))
if (__predict_false(mutex == NULL))
return EINVAL;
mvalue = mutex->value;
@ -590,7 +577,7 @@ int pthread_mutex_lock_impl(pthread_mutex_t *mutex)
shared = (mvalue & MUTEX_SHARED_MASK);
/* Handle normal case first */
if ( __likely(mtype == MUTEX_TYPE_BITS_NORMAL) ) {
if ( __predict_true(mtype == MUTEX_TYPE_BITS_NORMAL) ) {
_normal_lock(mutex, shared);
return 0;
}
@ -631,7 +618,7 @@ int pthread_mutex_lock_impl(pthread_mutex_t *mutex)
* implement it to get rid of the explicit memory
* barrier below.
*/
if (__unlikely(__bionic_cmpxchg(mvalue, newval, &mutex->value) != 0)) {
if (__predict_false(__bionic_cmpxchg(mvalue, newval, &mutex->value) != 0)) {
mvalue = mutex->value;
continue;
}
@ -643,7 +630,7 @@ int pthread_mutex_lock_impl(pthread_mutex_t *mutex)
* we will change it to 2 to indicate contention. */
if (MUTEX_STATE_BITS_IS_LOCKED_UNCONTENDED(mvalue)) {
newval = MUTEX_STATE_BITS_FLIP_CONTENTION(mvalue); /* locked state 1 => state 2 */
if (__unlikely(__bionic_cmpxchg(mvalue, newval, &mutex->value) != 0)) {
if (__predict_false(__bionic_cmpxchg(mvalue, newval, &mutex->value) != 0)) {
mvalue = mutex->value;
continue;
}
@ -676,7 +663,7 @@ int pthread_mutex_unlock_impl(pthread_mutex_t *mutex)
{
int mvalue, mtype, tid, shared;
if (__unlikely(mutex == NULL))
if (__predict_false(mutex == NULL))
return EINVAL;
mvalue = mutex->value;
@ -684,7 +671,7 @@ int pthread_mutex_unlock_impl(pthread_mutex_t *mutex)
shared = (mvalue & MUTEX_SHARED_MASK);
/* Handle common case first */
if (__likely(mtype == MUTEX_TYPE_BITS_NORMAL)) {
if (__predict_true(mtype == MUTEX_TYPE_BITS_NORMAL)) {
_normal_unlock(mutex, shared);
return 0;
}
@ -701,7 +688,7 @@ int pthread_mutex_unlock_impl(pthread_mutex_t *mutex)
if (!MUTEX_COUNTER_BITS_IS_ZERO(mvalue)) {
for (;;) {
int newval = mvalue - MUTEX_COUNTER_BITS_ONE;
if (__likely(__bionic_cmpxchg(mvalue, newval, &mutex->value) == 0)) {
if (__predict_true(__bionic_cmpxchg(mvalue, newval, &mutex->value) == 0)) {
/* success: we still own the mutex, so no memory barrier */
return 0;
}
@ -743,7 +730,7 @@ int pthread_mutex_trylock_impl(pthread_mutex_t *mutex)
{
int mvalue, mtype, tid, shared;
if (__unlikely(mutex == NULL))
if (__predict_false(mutex == NULL))
return EINVAL;
mvalue = mutex->value;
@ -751,7 +738,7 @@ int pthread_mutex_trylock_impl(pthread_mutex_t *mutex)
shared = (mvalue & MUTEX_SHARED_MASK);
/* Handle common case first */
if ( __likely(mtype == MUTEX_TYPE_BITS_NORMAL) )
if ( __predict_true(mtype == MUTEX_TYPE_BITS_NORMAL) )
{
if (__bionic_cmpxchg(shared|MUTEX_STATE_BITS_UNLOCKED,
shared|MUTEX_STATE_BITS_LOCKED_UNCONTENDED,
@ -775,7 +762,7 @@ int pthread_mutex_trylock_impl(pthread_mutex_t *mutex)
mtype |= shared | MUTEX_STATE_BITS_UNLOCKED;
mvalue = MUTEX_OWNER_TO_BITS(tid) | mtype | MUTEX_STATE_BITS_LOCKED_UNCONTENDED;
if (__likely(__bionic_cmpxchg(mtype, mvalue, &mutex->value) == 0)) {
if (__predict_true(__bionic_cmpxchg(mtype, mvalue, &mutex->value) == 0)) {
ANDROID_MEMBAR_FULL();
return 0;
}
@ -841,7 +828,7 @@ int pthread_mutex_lock_timeout_np_impl(pthread_mutex_t *mutex, unsigned msecs)
/* compute absolute expiration time */
__timespec_to_relative_msec(&abstime, msecs, clock);
if (__unlikely(mutex == NULL))
if (__predict_false(mutex == NULL))
return EINVAL;
mvalue = mutex->value;
@ -849,7 +836,7 @@ int pthread_mutex_lock_timeout_np_impl(pthread_mutex_t *mutex, unsigned msecs)
shared = (mvalue & MUTEX_SHARED_MASK);
/* Handle common case first */
if ( __likely(mtype == MUTEX_TYPE_BITS_NORMAL) )
if ( __predict_true(mtype == MUTEX_TYPE_BITS_NORMAL) )
{
const int unlocked = shared | MUTEX_STATE_BITS_UNLOCKED;
const int locked_uncontended = shared | MUTEX_STATE_BITS_LOCKED_UNCONTENDED;
@ -886,7 +873,7 @@ int pthread_mutex_lock_timeout_np_impl(pthread_mutex_t *mutex, unsigned msecs)
/* first try a quick lock */
if (mvalue == mtype) {
mvalue = MUTEX_OWNER_TO_BITS(tid) | mtype | MUTEX_STATE_BITS_LOCKED_UNCONTENDED;
if (__likely(__bionic_cmpxchg(mtype, mvalue, &mutex->value) == 0)) {
if (__predict_true(__bionic_cmpxchg(mtype, mvalue, &mutex->value) == 0)) {
ANDROID_MEMBAR_FULL();
return 0;
}
@ -1063,7 +1050,7 @@ __pthread_cond_pulse(pthread_cond_t *cond, int counter)
{
long flags;
if (__unlikely(cond == NULL))
if (__predict_false(cond == NULL))
return EINVAL;
flags = (cond->value & ~COND_COUNTER_MASK);
@ -1204,7 +1191,7 @@ int pthread_once( pthread_once_t* once_control, void (*init_routine)(void) )
* stores performed by the initialization function are observable on
* this CPU after we exit.
*/
if (__likely((*ocptr & ONCE_COMPLETED) != 0)) {
if (__predict_true((*ocptr & ONCE_COMPLETED) != 0)) {
ANDROID_MEMBAR_FULL();
return 0;
}

3
libc/private/bionic_tls.h
View file

@ -105,9 +105,6 @@ extern int __set_tls(void* ptr);
#error unsupported architecture
#endif
/* return the stack base and size, used by our malloc debugger */
extern void* __get_stack_base(int* p_stack_size);
__END_DECLS
#if defined(__cplusplus)