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Only installs the tables if SVE256 isn't supported yet AVX is explicitly enabled with HostFeatures, to protect accidental enablement early. - Only implements 85 instructions starting out - Basic vector moves - Basic vector unary operations - Basic vector binary operations - VZeroUpper/VZeroAll The bulk of the implementation is currently the handling for loading and storing the halves of the registers from the context or from memory. This means the load/store helpers must always return a pair unless only requesting the bottom half of the register, which occurs with 128-bit AVX operations. The store side then needing to consume the named zero register if it occurs since those cases will zero the upper bits. This implementation approach has a few benefits. - I can pound this out extremely quickly - SSE implementations are unaffected and don't need to deal with the insert behaviour of SVE256. - We still keep the SVE256 implementation for the inevitable future when hardware vendors actually do implement it (Give it 8 years or something). - We can actually unit test this path in CI once it is complete. - We can partially optimize some paths with SVE128 (Gathers) and support a full ASIMD path if necessary. One downside is that I can't enable this in CI yet because it can't pass all unittests. but that's a non-issue since it is going to be in heavy flux as I'm hammering out the implementation. It'll get switched on at the end when it's passing all 1265 AVX unittests. Currently at 1001 on this.
FEX - Fast x86 emulation frontend
FEX allows you to run x86 and x86-64 binaries on an AArch64 host, similar to qemu-user and box86. It has native support for a rootfs overlay, so you don't need to chroot, as well as some thunklibs so it can forward things like GL to the host. FEX presents a Linux 5.0+ interface to the guest, and supports only AArch64 as a host. FEX is very much work in progress, so expect things to change.
Quick start guide
For Ubuntu 20.04, 21.04, 21.10, 22.04
Execute the following command in the terminal to install FEX through a PPA.
curl --silent https://raw.githubusercontent.com/FEX-Emu/FEX/main/Scripts/InstallFEX.py --output /tmp/InstallFEX.py && python3 /tmp/InstallFEX.py && rm /tmp/InstallFEX.py
This command will walk you through installing FEX through a PPA, and downloading a RootFS for use with FEX.
Ubuntu PPA is updated with our monthly releases.
For everyone else
Please see Building FEX.
Getting Started
FEX has been tested to build and run on ARMv8.0+ hardware. ARMv7 hardware will not work. Expected operating system usage is Linux. FEX has been tested with Ubuntu 20.04, 20.10, and 21.04. Also Arch Linux.
On AArch64 hosts the user MUST have an x86-64 RootFS Creating a RootFS.
Navigating the Source
See the Source Outline for more information.
Building FEX
Follow the guide on the official FEX-Emu Wiki here.
RootFS generation
AArch64 hosts require a rootfs for running applications. Follow the guide on the wiki page for seeing how to set up the rootfs from scratch https://wiki.fex-emu.com/index.php/Development:Setting_up_RootFS
