Test wasm32 with and without simd128 in CI

.github/workflows/rust.yml

@@ -27,3 +27,19 @@ jobs:
         run: cargo build --verbose
       - name: Run tests
         run: cargo test --verbose
+
+  test-wasm:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        simd128: ["-simd128", "+simd128"]
+    env:
+      RUSTFLAGS: -C target-feature=${{ matrix.simd128 }}
+      CARGO_TARGET_WASM32_WASIP1_RUNNER: node --no-warnings scripts/wasi-node.mjs
+    steps:
+      - uses: actions/checkout@v4
+      - run: rustup target add wasm32-wasip1 wasm32-unknown-unknown
+      - name: Check wasm32-unknown-unknown
+        run: cargo check --verbose --release --lib --no-default-features --features scalar --target wasm32-unknown-unknown
+      - name: Run release tests
+        run: cargo test --verbose --release --no-default-features --features rand,scalar --target wasm32-wasip1

scripts/wasi-node.mjs

@@ -0,0 +1,25 @@
+// Run a wasm32-wasip1 binary under Node's V8 engine, for use as a cargo runner:
+//
+//   CARGO_TARGET_WASM32_WASIP1_RUNNER="node --no-warnings scripts/wasi-node.mjs" \
+//   RUSTFLAGS="-C target-feature=+simd128" \
+//   cargo test --release --features scalar --target wasm32-wasip1
+import { readFile } from 'node:fs/promises';
+import process from 'node:process';
+import { WASI } from 'node:wasi';
+
+const [wasmPath, ...args] = process.argv.slice(2);
+if (!wasmPath) {
+  console.error('usage: node wasi-node.mjs <file.wasm> [args...]');
+  process.exit(2);
+}
+
+const wasi = new WASI({
+  version: 'preview1',
+  args: [wasmPath, ...args],
+  env: process.env,
+  returnOnExit: true,
+});
+
+const module = await WebAssembly.compile(await readFile(wasmPath));
+const instance = await WebAssembly.instantiate(module, wasi.getImportObject());
+process.exitCode = wasi.start(instance);