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Skyler used a method described in the documentation that would change the mapped memory between Writeable when emitting code to Executable when executing code. Apple even provides documentation for helping developers port JITs to macOS on ARM. This was thankfully a lot less strict than on iOS devices, which strictly forbid mapping memory as executable whatsoever and made iOS untenable for us to officially support. Outside of emulators, the primary place that you'll actually see self-modifying code is web browsers, which is often a vector for attack on a computer. This requirement from Apple is mostly a security feature to prevent bugs in programs that read untrusted data from being exploited to run malware. What it does is make it so that areas of memory must be explicitly marked as for Write or Execute, but not both! Because it's easier and hasn't been forbidden on any of the prior platforms that Dolphin supports, the emulator previously just marked memory regions used by the JIT as for Write and Execute. Apple requires W^X ( Write Xor Execute) conformance for native macOS M1 applications. Unfortunately, getting the AArch64 JIT to work wasn't exactly trivial. Developers thought, why not just use Dolphin's AArch64 JIT for native support? And thus, the race was on as several people tried to figure out the hurdles of getting Dolphin's AArch64 JIT to run on the M1. But the fact it had to do it through a translation layer was a huge performance bottleneck. The experience wasn't entirely smooth due to jitter from Jitting a JIT, yet the processor proved itself more than capable of handling Dolphin.

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Using the Rosetta 2 translation layer with Dolphin's x86-64 JIT, the M1 easily ran most games at full speed and handily outran like-class Intel Macs. Let's just say they had gotten our attention. Not only can the M1 perform the same tasks as their former Intel processors, they can do it faster even when using their Rosetta 2 translation layer! All of this while still providing considerably better single threaded performance compared to Intel. Yet even with ARM reaching datacenters and even some interesting hardware giving us a glimpse at what could be, ARM's reputation as being weaker than x86 has remained firmly entrenched.Д«ut with M1, Apple has completely shattered this foolish notion. Intel's iron grip of process superiority has long slipped, and the ARM instruction set has carefully expanded to more efficiently handle more tasks while not sacrificing power efficiency. It was a processor for casual things like phones, and not really meant for 'real work'.

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All combined, ARM was the processor of choice for battery life in portable devices, but when pushed they had poor overall performance compared to Intel's x86 processors. However given unoptimized workloads, an ARM processor would need many more cycles to perform it than an x86 CPU.

With a tight instruction set instead of the ever ballooning mess that is x86, ARM was able to get away with literally less processor while performing optimized tasks, giving it exceptional power efficiency. ARM is a Reduced Instruction Set Computing (RISC) architecture that was specifically designed for efficiency with portable devices.

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It is an understatement to say that Apple dropped a bomb on the PC industry with the M1 ARM processor. These builds are available immediately and natively support both macOS M1 and Intel macOS devices. That's because delroth and Skyler had set up a new buildbot using a service called MacStadium for creating Universal macOS binaries. This announcement has been in the works for some time, eagle eyed users may have noticed that earlier this month macOS builds were now being designated as 'Intel'. Now we have the answer.ДЄpple's M1 hardware is incredibly powerful and excels at running Dolphin. With its powerful Apple Silicon processor smashing benchmarks all over the place, users and developers were both asking if a native Dolphin build would be possible.

From the announcement made on November 10th, 2020, users have had high hopes for the new Apple M1 devices.