From 148f9e883df67f6df8fb2a2afc79c3a63e36c923 Mon Sep 17 00:00:00 2001
From: can1357 <me@can.ac>
Date: Tue, 10 Feb 2026 22:06:34 +0100
Subject: [PATCH] ci(workflows): added RUSTFLAGS configuration for x86-64-v3
 CPU optimization in CI and native builds

- Added RUSTFLAGS environment variable configuration to CI workflow for x86-64-v3 CPU optimization across multiple build jobs.
- Added per-matrix rustflags configuration for native builds on x64 platforms (Linux, macOS Intel, Windows).
- Updated build-native script to default to native CPU optimization for local builds when not cross-compiling.
---
 .github/workflows/ci.yml                 | 8 ++++++++
 packages/natives/scripts/build-native.ts | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1c490d16c..92ed1ccf4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,6 +20,8 @@ concurrency:
 jobs:
   rust:
     runs-on: ubuntu-latest
+    env:
+      RUSTFLAGS: -C target-cpu=x86-64-v3
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@nightly
@@ -41,6 +43,7 @@ jobs:
           - os: ubuntu-latest
             platform: linux
             arch: x64
+            rustflags: "-C target-cpu=x86-64-v3"
           - os: ubuntu-latest
             platform: linux
             arch: arm64
@@ -48,12 +51,14 @@ jobs:
           - os: macos-15-intel
             platform: darwin
             arch: x64
+            rustflags: "-C target-cpu=x86-64-v3"
           - os: macos-14
             platform: darwin
             arch: arm64
           - os: windows-latest
             platform: win32
             arch: x64
+            rustflags: "-C target-cpu=x86-64-v3"
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
@@ -79,6 +84,7 @@ jobs:
           TARGET_PLATFORM: ${{ matrix.platform }}
           TARGET_ARCH: ${{ matrix.arch }}
           CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER: aarch64-linux-gnu-gcc
+          RUSTFLAGS: ${{ matrix.rustflags }}
         run: bun --cwd=packages/natives run build:native
       - name: Upload native addon
         uses: actions/upload-artifact@v4
@@ -89,6 +95,8 @@ jobs:
 
   test:
     runs-on: ubuntu-latest
+    env:
+      RUSTFLAGS: -C target-cpu=x86-64-v3
     steps:
       - uses: actions/checkout@v4
         with:
diff --git a/packages/natives/scripts/build-native.ts b/packages/natives/scripts/build-native.ts
index 6658eccc4..14a6c352b 100644
--- a/packages/natives/scripts/build-native.ts
+++ b/packages/natives/scripts/build-native.ts
@@ -15,6 +15,11 @@ const isCrossCompile =
 	targetPlatform !== process.platform ||
 	targetArch !== process.arch;
 
+// Default to native CPU optimization for local builds; CI overrides via RUSTFLAGS env
+if (!isCrossCompile && !Bun.env.RUSTFLAGS) {
+	Bun.env.RUSTFLAGS = "-C target-cpu=native";
+}
+
 async function cleanupStaleTemps(dir: string): Promise<void> {
 	try {
 		const entries = await fs.readdir(dir);