Revert "[nce] Adjusted precise access fault window handling + decay mechanism"

src/core/arm/nce/arm_nce.cpp

@@ -190,44 +190,10 @@ bool ArmNce::IsPreciseAccessPage(u64 addr) const {
 
 void ArmNce::MarkPreciseAccessPage(u64 addr) {
     const std::scoped_lock lk{m_precise_pages_guard};
-    const u64 page = AlignDownPage(addr);
-    if (auto it = m_precise_pages.find(page); it != m_precise_pages.end()) {
-        it->second = std::min<u8>(MaxPreciseAccessPageWeight, static_cast<u8>(it->second + 1));
-        return;
-    }
-
-    while (m_precise_pages.size() >= MaxPreciseAccessPages) {
-        DecayPreciseAccessPagesLocked();
-    }
-
-    m_precise_pages.emplace(page, 1);
-}
-
-void ArmNce::MarkPreciseAccessFaultWindow(u64 addr) {
-    MarkPreciseAccessPage(addr);
-
-    if (!IsNearPageBoundary(addr)) {
-        return;
-    }
-
-    const u64 page_offset = addr & Memory::YUZU_PAGEMASK;
-    if (page_offset < SplitPageAccessWindow && addr >= Memory::YUZU_PAGESIZE) {
-        MarkPreciseAccessPage(addr - Memory::YUZU_PAGESIZE);
-    }
-    if (page_offset + SplitPageAccessWindow > Memory::YUZU_PAGESIZE) {
-        MarkPreciseAccessPage(addr + Memory::YUZU_PAGESIZE);
-    }
-}
-
-void ArmNce::DecayPreciseAccessPagesLocked() {
-    for (auto it = m_precise_pages.begin(); it != m_precise_pages.end();) {
-        if (it->second > 1) {
-            --it->second;
-            ++it;
-        } else {
-            it = m_precise_pages.erase(it);
-        }
+    if (m_precise_pages.size() >= MaxPreciseAccessPages) {
+        m_precise_pages.clear();
     }
+    m_precise_pages.insert(AlignDownPage(addr));
 }
 
 void ArmNce::LockThread(Kernel::KThread* thread) {

src/core/arm/nce/arm_nce.h

@@ -7,7 +7,7 @@
 #pragma once
 
 #include <mutex>
-#include <unordered_map>
+#include <unordered_set>
 
 #include "core/arm/arm_interface.h"
 #include "core/arm/nce/guest_context.h"
@@ -84,8 +84,6 @@ private:
 
     bool IsPreciseAccessPage(u64 addr) const;
     void MarkPreciseAccessPage(u64 addr);
-    void MarkPreciseAccessFaultWindow(u64 addr);
-    void DecayPreciseAccessPagesLocked();
 
 public:
     Core::System& m_system;
@@ -99,7 +97,7 @@ public:
     Kernel::KThread* m_running_thread{};
 
     mutable std::mutex m_precise_pages_guard{};
-    std::unordered_map<u64, u8> m_precise_pages{};
+    std::unordered_set<u64> m_precise_pages{};
 
     // Stack for signal processing.
     std::unique_ptr<u8[]> m_stack{};