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Ryan Houdek 10ad5db686 Adds an option to disable the IR interpreter

By default we won't build with the interpeter to reduce user confusion.
The interpreter isn't really useful to end users so remove it.

Completely removes it from building except for the fallback operations.

This also removes the selection from FEXConfig to remove selection
confusion there.

File Stats:
FEXLoader Size with Interpreter:    3422768 bytes
FEXLoader Size without Interpreter: 3301944 bytes
Size difference:                    96.4699915%
Bytes removed:                      120824 bytes
4k pages removed:                   29.498046875 -> 30 rounded up

VM Stats (Reported from bloaty):
Memory Size with Interpreter:    6.50Mi
Memory Size without Interpreter: 6.38Mi
Size difference:                 98.1538462%

2022-02-01 13:00:29 -08:00

docs

IR: Add AOT Cache

2021-02-23 12:08:57 +02:00

include

externals: Update fmt to 8.1.1

2022-01-13 14:48:35 -05:00

Scripts

json_ir_generator: Mark generated IR functions [[nodiscard]] where applicable

2021-11-26 14:09:17 -05:00

Source

Adds an option to disable the IR interpreter

2022-02-01 13:00:29 -08:00

CMakeLists.txt

CMake: Adds an OVERRIDE_VERSION option

2021-12-30 22:55:46 -08:00

LICENSE

FEXCore: Move to Externals/FEXCore

2020-03-06 09:07:37 +02:00

Readme.md

Moves SonicUtils in to FEXCore

2020-11-29 00:30:28 -08:00

Readme.md

FEXCore - Fast x86 Core emulation library

This is the core emulation library that is used for the FEX emulator project. This project aims to provide a fast and functional x86-64 emulation library that can meet and surpass other x86-64 emulation libraries.

Goals

Be as fast as possible, beating and exceeding current options for x86-64 emulation
- 25% - 50% lower performance than native code would be desired target
- Use an IR to efficiently translate x86-64 to our host architecture
- Support a tiered recompiler to allow for fast runtime performance
- Support offline compilation and offline tooling for inspection and performance analysis
- Support threaded emulation. Including emulating x86-64's strong memory model on weak memory model architectures
Support a significant portion of the x86-64 instruction space.
- Including MMX, SSE, SSE2, SSE3, SSSE3, and SSE4*
Support fallback routines for uncommonly used x86-64 instructions
- Including x87 and 3DNow!
Only support userspace emulation.
- All x86-64 instructions run as if they are under CPL-3(userland) security layer
Minimal Linux Syscall emulation for testing purposes
Portable library implementation in order to support easy integration in to applications

Target Host Architecture

The target host architecture for this library is AArch64. Specifically the ARMv8.1 version or newer. The CPU IR is designed with AArch64 in mind but there is a desire to run the recompiled code on other architectures as well. Multiple architecture support is desired for easier bringup and debugging, performance isn't as much of a priority there (ex. x86-64(guest) translated to x86-64(host))

Not currently goals but will be in the future

32bit x86 support
- This will be a desire in the future, but to lower the amount of work required, decided to push this off for now.
Integration in to WINE
Later generation of x86-64 instruction sets
- Including AVX, F16C, XOP, FMA, AVX2, etc

Not desired

Kernel space emulation
CPL0-2 emulation
Real Mode, Protected Mode, Virtual-8086 Mode, System Management Mode
IRQs
SVM
"Cycle Accurate" emulation

Dependencies

clang-tidy if you want to ensure the code stays tidy
cmake
A C++17 compliant compiler (There are assumptions made about using Clang and LTO)