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video_core: rasterizer_cache: Use u16 for cached page count.
- Greatly reduces the risk of overflow, at the cost of doubling the size of this array.
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parent
9110cfdefb
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4b95b0df97
2 changed files with 9 additions and 9 deletions
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@ -18,10 +18,10 @@ RasterizerAccelerated::~RasterizerAccelerated() = default;
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void RasterizerAccelerated::UpdatePagesCachedCount(VAddr addr, u64 size, int delta) {
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const auto page_end = Common::DivCeil(addr + size, Core::Memory::PAGE_SIZE);
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for (auto page = addr >> Core::Memory::PAGE_BITS; page != page_end; ++page) {
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auto& count = cached_pages.at(page >> 3).Count(page);
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auto& count = cached_pages.at(page >> 2).Count(page);
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if (delta > 0) {
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ASSERT_MSG(count < UINT8_MAX, "Count may overflow!");
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ASSERT_MSG(count < UINT16_MAX, "Count may overflow!");
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} else if (delta < 0) {
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ASSERT_MSG(count > 0, "Count may underflow!");
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} else {
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@ -29,7 +29,7 @@ void RasterizerAccelerated::UpdatePagesCachedCount(VAddr addr, u64 size, int del
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}
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// Adds or subtracts 1, as count is a unsigned 8-bit value
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count += static_cast<u8>(delta);
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count += static_cast<u16>(delta);
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// Assume delta is either -1 or 1
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if (count == 0) {
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@ -29,20 +29,20 @@ private:
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public:
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CacheEntry() = default;
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std::atomic_uint8_t& Count(std::size_t page) {
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return values[page & 7];
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std::atomic_uint16_t& Count(std::size_t page) {
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return values[page & 3];
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}
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const std::atomic_uint8_t& Count(std::size_t page) const {
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return values[page & 7];
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const std::atomic_uint16_t& Count(std::size_t page) const {
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return values[page & 3];
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}
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private:
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std::array<std::atomic_uint8_t, 8> values{};
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std::array<std::atomic_uint16_t, 4> values{};
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};
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static_assert(sizeof(CacheEntry) == 8, "CacheEntry should be 8 bytes!");
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std::array<CacheEntry, 0x800000> cached_pages;
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std::array<CacheEntry, 0x1000000> cached_pages;
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Core::Memory::Memory& cpu_memory;
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};
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