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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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21
libraries/libmesosphere/source/kern_panic.cpp
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@@ -42,15 +42,15 @@ namespace ams::kern {
return arr;
}();
std::atomic<s32> g_next_ticket = 0;
std::atomic<s32> g_current_ticket = 0;
constinit util::Atomic<s32> g_next_ticket{0};
constinit util::Atomic<s32> g_current_ticket{0};
std::array<s32, cpu::NumCores> g_core_tickets = NegativeArray;
constinit std::array<s32, cpu::NumCores> g_core_tickets = NegativeArray;
s32 GetCoreTicket() {
const s32 core_id = GetCurrentCoreId();
if (g_core_tickets[core_id] == -1) {
g_core_tickets[core_id] = 2 * g_next_ticket.fetch_add(1);
g_core_tickets[core_id] = 2 * g_next_ticket.FetchAdd(1);
}
return g_core_tickets[core_id];
}
@@ -58,24 +58,21 @@ namespace ams::kern {
void WaitCoreTicket() {
const s32 expected = GetCoreTicket();
const s32 desired = expected + 1;
s32 compare = g_current_ticket;
s32 compare = g_current_ticket.Load<std::memory_order_relaxed>();
do {
if (compare == desired) {
break;
}
compare = expected;
} while (!g_current_ticket.compare_exchange_weak(compare, desired));
} while (!g_current_ticket.CompareExchangeWeak(compare, desired));
}
void ReleaseCoreTicket() {
const s32 expected = GetCoreTicket() + 1;
const s32 desired = expected + 1;
s32 compare = g_current_ticket;
do {
if (compare != expected) {
break;
}
} while (!g_current_ticket.compare_exchange_weak(compare, desired));
s32 compare = expected;
g_current_ticket.CompareExchangeStrong(compare, desired);
}
ALWAYS_INLINE KExceptionContext *GetPanicExceptionContext(int core_id) {