9813553f02
We now have two types of destinations:
* regular destinations. These are SSA. You get exactly 1 per instruction. This
is what almost every instruction should use.
* special destinations, introduced here. These are *not* SSA. They must be
allocated with a special instruction (added later in this PR), and then they
are mutated by the instruction. There are two types, either pure destinations
("out") or read-modify-write source+destinations ("in-out"). The former are
useful for instructions that return multiple destinations, like Memcpy. The
latter are useful for instructions that need a source tied with a special
destination (currently just Pop, introduced later in this series).
Special destinations reuse the mechanism of sources, to get around the
limitations on regular destinations in our current IR. Ops with special
destinations desugar to ops with no destination but extra sources prefixed Out
or Inout.
They further require HasSideEffects so we don't optimize ourselves into corners.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
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
