Most floating-point operations on the Wii/GC set result flags based on the result of the operation. In addition, unnecessary loads from the destination memory are eliminated. In a memory copy routine, the dcbz instruction is used to simply establish a destination data block in the cache so that subsequent store instructions result in cache hits. This instruction is often used to efficiently zero large sections of memory without first fetching that memory into the cache. The Data Cache Block Set to Zero (dcbz) instruction in Power ISA establishes a cache block in the data cache and fills it with zero bytes without accessing memory if the effective address of the dcbz is marked cacheable and non-write-through. Secondly, the GameCube only has 24MB (and some specialized areas) of RAM across a 4GB address space, meaning most memory addresses have no RAM backing them! If a game were to access a real memory address with no backing memory, it'd get garbage or even crash! By using virtual memory, the MMU can throw an exception giving the game a way to handle the situation or provide valuable feedback to developers on what went wrong.ĭolphin is able to emulate the MMU with several degrees of accuracy based on theories of how the game is going to behave. First of all, it gives the CPU an opportunity to cache accesses, greatly speeding up the efficiency of accessing often used values. The games are given access to virtual memory instead of real memory for several reasons. This can be done in two ways, with Block Address Translations (BATs) for huge portions of memory or the page tables for small fine-grained mappings. Rather than directly accessing available RAM, games interface with virtual memory which is then translated to physical memory by the MMU. The Memory Management Unit, or MMU, is responsible for quickly giving games access to data and code. We've only removed the ability to turn it off, not the feature itself." "Idle skipping is always turned on, starting with Dolphin 5.0-948. JosJuice (One of the Dolphin Developers): Has to do with sound, note: In more recent builds of Dolphin it is always turned on and even the option to turn it off has been removed. For example Skies of Arcadia Legends Requires it to be off so the text in the pause menu won't look all glitched.Įnable Idle Skipping (Has to do with sound) Refer to this page for a list of titles that require disabling Dual Core. Recommended on most titles, though may cause issues like crashing or graphic issues on some titles. Provides a significant speedup on modern systems. Here is an explanation as to what each one is and what they do:Įnable Dual Core: (Used to access all of your computer's cores) These settings are manually set for every game, but you may be able to improve performance of any one game by turning on and off certain options. And you will see a list of Core Settings. When you right click a game from your game list and go to properties you will be on the Game Config Tab.
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