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video_core: rasterizer_cache: Use u16 for cached page count.

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- Greatly reduces the risk of overflow, at the cost of doubling the size of this array.
This commit is contained in:
bunnei
2021-05-27 14:47:24 -07:00
parent 9110cfdefb
commit 4b95b0df97
2 changed files with 9 additions and 9 deletions
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6
src/video_core/rasterizer_accelerated.cpp
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@ -18,10 +18,10 @@ RasterizerAccelerated::~RasterizerAccelerated() = default;
void RasterizerAccelerated::UpdatePagesCachedCount(VAddr addr, u64 size, int delta) {
const auto page_end = Common::DivCeil(addr + size, Core::Memory::PAGE_SIZE);
for (auto page = addr >> Core::Memory::PAGE_BITS; page != page_end; ++page) {
auto& count = cached_pages.at(page >> 3).Count(page);
auto& count = cached_pages.at(page >> 2).Count(page);
if (delta > 0) {
ASSERT_MSG(count < UINT8_MAX, "Count may overflow!");
ASSERT_MSG(count < UINT16_MAX, "Count may overflow!");
} else if (delta < 0) {
ASSERT_MSG(count > 0, "Count may underflow!");
} else {
@ -29,7 +29,7 @@ void RasterizerAccelerated::UpdatePagesCachedCount(VAddr addr, u64 size, int del
}
// Adds or subtracts 1, as count is a unsigned 8-bit value
count += static_cast<u8>(delta);
count += static_cast<u16>(delta);
// Assume delta is either -1 or 1
if (count == 0) {