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kern/util: use custom atomics wrapper to substantially improve codegen

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This commit is contained in:
Michael Scire
2021-10-19 15:24:15 -07:00
parent 52332e8d75
commit d74f364107
26 changed files with 688 additions and 260 deletions
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11
libraries/libmesosphere/source/kern_k_light_lock.cpp
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@@ -40,7 +40,7 @@ namespace ams::kern {
KScopedSchedulerLock sl;
/* Ensure we actually have locking to do. */
if (m_tag.load(std::memory_order_relaxed) != _owner) {
if (m_tag.Load<std::memory_order_relaxed>() != _owner) {
return false;
}
@@ -68,16 +68,13 @@ namespace ams::kern {
KScopedSchedulerLock sl;
/* Get the next owner. */
s32 num_waiters = 0;
s32 num_waiters;
KThread *next_owner = owner_thread->RemoveWaiterByKey(std::addressof(num_waiters), reinterpret_cast<uintptr_t>(std::addressof(m_tag)));
/* Pass the lock to the next owner. */
uintptr_t next_tag = 0;
if (next_owner != nullptr) {
next_tag = reinterpret_cast<uintptr_t>(next_owner);
if (num_waiters > 1) {
next_tag |= 0x1;
}
next_tag = reinterpret_cast<uintptr_t>(next_owner) | static_cast<uintptr_t>(num_waiters > 1);
next_owner->EndWait(ResultSuccess());
@@ -92,7 +89,7 @@ namespace ams::kern {
}
/* Write the new tag value. */
m_tag.store(next_tag);
m_tag.Store<std::memory_order_release>(next_tag);
}
}