diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8c6dee16fb..59aad0b5d0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -255,6 +255,28 @@ jobs:
       env:
         TARGET: ${{ matrix.target.tuple }}
 
+  # Check that the generated files agree with the checked-in versions.
+  check-stdarch-gen:
+    needs: [style]
+    name: Check stdarch-gen-{arm, loongarch} output 
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install Rust
+      run: rustup update nightly && rustup default nightly && rustup component add rustfmt
+    - name: Check arm spec
+      run: |
+        cargo run --bin=stdarch-gen-arm --release -- crates/stdarch-gen-arm/spec
+        git diff --exit-code
+    - name: Check lsx.spec
+      run: |
+        cargo run --bin=stdarch-gen-loongarch --release -- crates/stdarch-gen-loongarch/lsx.spec
+        git diff --exit-code
+    - name: Check lasx.spec
+      run: |
+        cargo run --bin=stdarch-gen-loongarch --release -- crates/stdarch-gen-loongarch/lasx.spec
+        git diff --exit-code
+
   build-std-detect:
     needs: [style]
     name: Build std_detect
@@ -271,6 +293,7 @@ jobs:
       - verify
       - test
       - build-std-detect
+      - check-stdarch-gen
     runs-on: ubuntu-latest
     # We need to ensure this job does *not* get skipped if its dependencies fail,
     # because a skipped job is considered a success by GitHub. So we have to
diff --git a/crates/stdarch-gen-loongarch/src/main.rs b/crates/stdarch-gen-loongarch/src/main.rs
index aa9990b6cc..9e10a4c3f0 100644
--- a/crates/stdarch-gen-loongarch/src/main.rs
+++ b/crates/stdarch-gen-loongarch/src/main.rs
@@ -280,7 +280,7 @@ fn gen_bind_body(
             let fn_output = if out_t.to_lowercase() == "void" {
                 String::new()
             } else {
-                format!("-> {}", type_to_rst(out_t, is_store))
+                format!(" -> {}", type_to_rst(out_t, is_store))
             };
             let fn_inputs = match para_num {
                 1 => format!("(a: {})", type_to_rst(in_t[0], is_store)),
@@ -304,7 +304,7 @@ fn gen_bind_body(
                 ),
                 _ => panic!("unsupported parameter number"),
             };
-            format!("fn __{current_name}{fn_inputs} {fn_output};")
+            format!("fn __{current_name}{fn_inputs}{fn_output};")
         };
         let function = format!(
             r#"    #[link_name = "llvm.loongarch.{}"]