Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

[Mono]: Reduce Mono AOT cross compiler x64 memory footprint. #97096

Merged
merged 3 commits into from
Feb 9, 2024
Merged

[Mono]: Reduce Mono AOT cross compiler x64 memory footprint. #97096

merged 3 commits into from
Feb 9, 2024

Commits on Feb 9, 2024

  1. Reduce Mono AOT cross compiler x64 memory footprint. 

    Building .net8 S.P.C using Mono AOT cross compiler in full AOT consumes
a large amount of memory (up to 6 GB). This is mainly due to generated
LLVM module not being optimized at all while kept in memory during
full module generation. Mono x64 also lacks support for several
intrinsics as well as Vector 256/512 that in turn leads to massive
inlining of intrinsics functions generating a very large LLVM module,
where majority of this code ends up as dead code due to
IsSupported/IsHardwareAccelerated returning false.

The follow commit adjusts several things that will bring down the
memory usage, compiling .net8/.net9 Mono S.P.C on x64 Windows
from 6 GB down to ~750 MB.

* Use PSNE implementations on intrinsics not supported on Mono.
* Add ILLinker substitutions for intrinsics not supported on Mono. Enables
ILLinker to do dead code elimination, reduce code to AOT compile.
* Prevent aggressive inlining for a couple of unsupported intrinsics types
making sure we don't end up with excessive inlining, exploding code size.
* Run a couple of LLVM optimization passes on each generated method doing
early code simplification and dead code elimination during LLVM module
generation.
* Explicit SN_get_IsHardwareAccelerated/SN_get_IsSupported intrinsics
implementation for all unsupported Mono x64 SIMD intrinsics.
* Fixed numerous memory leaks in Mono AOT cross compiler code.
* Fix a couple of sequence points free after use errors.
* Fix an anonymous struct build warning triggering build error for
LLVM enabled cross compiler on Windows.
    @lateralusX @vargaz
    lateralusX authored and vargaz committed Feb 9, 2024
    Configuration menu
    Copy the full SHA
    f090a34 View commit details
    Browse the repository at this point in the history

  2. Fix review feedback.

    @lateralusX @vargaz
    lateralusX authored and vargaz committed Feb 9, 2024
    Configuration menu
    Copy the full SHA
    cfaf8d9 View commit details
    Browse the repository at this point in the history

  3. Minor cleanups.

    @vargaz
    vargaz committed Feb 9, 2024
    Configuration menu
    Copy the full SHA
    5ab0d94 View commit details
    Browse the repository at this point in the history