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added section on cranelift codegen #801

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added section on cranelift codegen #801

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added section on cranelift codegen
MalekiRe Nov 4, 2023
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alice-i-cecile May 5, 2024
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3 changes: 3 additions & 0 deletions content/learn/book/getting-started/setup/_index.md
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Expand Up @@ -200,6 +200,9 @@ Bevy can be built just fine using default configuration on stable Rust. However

For more information, see [The rustup book: Overrides](https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file).

* **Cranelift Codegen**: This uses a new nightly-only codegen that can be 300% faster than LLVM! However it only currently works on Linux.
[Cranelift codegen setup](https://bjorn3.github.io/2023/10/31/progress-report-oct-2023.html).
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Maybe link to the setup section of the readme instead? Unlike this page it will be kept up to date if the setup changes.

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Also it is possible to compile all dependencies with the LLVM backend and optimizations, but the main game crate with Cranelift to get much better runtime performance.

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@bjorn3 I've tried that before and ran into issues where I would get random segfaults.

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There were some abi incompatibilities in the past, but most should be fixed now.


* **Generic Sharing**: Allows crates to share monomorphized generic code instead of duplicating it. In some cases this allows us to "precompile" generic code so it doesn't affect iterative compiles. This is only available on nightly Rust.

To enable fast compiles, install the nightly rust compiler and LLD. Then copy the contents of [this file](https://github.com/bevyengine/bevy/blob/main/.cargo/config_fast_builds) to `YOUR_WORKSPACE/.cargo/config.toml`. For the project in this guide, that would be `my_bevy_game/.cargo/config.toml`.
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