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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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31
libraries/libmesosphere/source/kern_k_auto_object.cpp
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@@ -27,35 +27,4 @@ namespace ams::kern {
return obj;
}
NOINLINE bool KAutoObject::Open() {
MESOSPHERE_ASSERT_THIS();
/* Atomically increment the reference count, only if it's positive. */
u32 cur_ref_count = m_ref_count.load(std::memory_order_relaxed);
do {
if (AMS_UNLIKELY(cur_ref_count == 0)) {
MESOSPHERE_AUDIT(cur_ref_count != 0);
return false;
}
MESOSPHERE_ABORT_UNLESS(cur_ref_count < cur_ref_count + 1);
} while (!m_ref_count.compare_exchange_weak(cur_ref_count, cur_ref_count + 1, std::memory_order_relaxed));
return true;
}
NOINLINE void KAutoObject::Close() {
MESOSPHERE_ASSERT_THIS();
/* Atomically decrement the reference count, not allowing it to become negative. */
u32 cur_ref_count = m_ref_count.load(std::memory_order_relaxed);
do {
MESOSPHERE_ABORT_UNLESS(cur_ref_count > 0);
} while (!m_ref_count.compare_exchange_weak(cur_ref_count, cur_ref_count - 1, std::memory_order_relaxed));
/* If ref count hits zero, schedule the object for destruction. */
if (cur_ref_count - 1 == 0) {
this->ScheduleDestruction();
}
}
}