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Merged
vanlueckn merged 1 commit into from
Sep 3, 2026
Merged

Enable x86-64-v3 optimization for release binaries #130

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8 changes: 8 additions & 0 deletions .github/workflows/release.yml
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Expand Up @@ -92,6 +92,14 @@ jobs:
- name: Build
shell: bash
run: |
# Release binaries target x86-64-v3 (AVX2/FMA/BMI — Intel Haswell/2013+,
# AMD Zen+; lets LLVM autovectorise wider than baseline SSE2). Dev/CI
# builds stay on the baseline for compatibility and fast compiles.
# aarch64 is excluded: the flag is invalid there, and ARM64 already
# has NEON in its baseline.
if [[ "${{ matrix.target }}" == x86_64-* ]]; then
export RUSTFLAGS="-C target-cpu=x86-64-v3"
fi
args=(--release --locked --target ${{ matrix.target }} -p app -p route-editor -p vehicle-editor)
if [ "${{ matrix.dlss }}" = "true" ]; then
# Linux: libvulkan-dev puts the headers under /usr/include. Windows
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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -72,7 +72,7 @@ For a faster edit-compile-run loop, add `--features dev` to any of the four bina
(`app`, `route-editor`, `vehicle-editor`, `signal-editor`). It links Bevy as a shared library, which cuts the
relink after a code change. The first build with the flag recompiles Bevy, and the resulting
binary needs the Bevy DLL next to it — so use it for development only, never for a release.
Builds also use the toolchain's own `rust-lld` linker on Windows (see `.cargo/config.toml`), dependencies compile at `opt-level = 3` while the workspace itself stays at `1`, and `--release` adds thin LTO with a single codegen unit.
Builds also use the toolchain's own `rust-lld` linker on Windows (see `.cargo/config.toml`), dependencies compile at `opt-level = 3` while the workspace itself stays at `1`, and `--release` adds thin LTO with a single codegen unit. Release binaries for `x86_64` additionally build with `-C target-cpu=x86-64-v3` (see `.github/workflows/release.yml`) — needs an Intel/AMD CPU from ~2013+ (Haswell/Zen+); for a local release-equivalent build set `RUSTFLAGS="-C target-cpu=x86-64-v3"` yourself.

On Linux the four programs run natively on **Wayland**: winit picks Wayland whenever `WAYLAND_DISPLAY` or `WAYLAND_SOCKET` is set and falls back to X11 (or XWayland) otherwise.

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