Enable optimization tweaks and remarks

.github/workflows/rust.yml

@@ -5,6 +5,7 @@ on:
     branches: [ "master" ]
 env:
   CARGO_TERM_COLOR: always
+  RUSTFLAGS: -Clinker-plugin-lto -Cremark=all -Zremark-dir=/tmp/remarks -Clinker=clang-17
 jobs:
   test:
     runs-on: ubuntu-latest
@@ -43,6 +44,12 @@ jobs:
           command: bench
           args: --no-run
           toolchain: nightly
+      - name: Upload optimization remarks
+        uses: actions/upload-artifact@v4
+        with:
+          name: Optimization remarks
+          path: /tmp/remarks/
+          if-no-files-found: error
       - name: Save Rust cache
         uses: actions/cache/save@v3
         with:

Cargo.toml

@@ -23,3 +23,6 @@ num_cpus = "1.16.0"
 [[bench]]
 name = "bench"
 harness = false
+lto = true
+codegen-units = 1
+opt-level = 3