Rename diagnostics to error_codes

src/librustc_codegen_llvm/error_codes.rs

@@ -0,0 +1,40 @@
+#![allow(non_snake_case)]
+
+register_long_diagnostics! {
+
+E0511: r##"
+Invalid monomorphization of an intrinsic function was used. Erroneous code
+example:
+
+```ignore (error-emitted-at-codegen-which-cannot-be-handled-by-compile_fail)
+#![feature(platform_intrinsics)]
+
+extern "platform-intrinsic" {
+    fn simd_add<T>(a: T, b: T) -> T;
+}
+
+fn main() {
+    unsafe { simd_add(0, 1); }
+    // error: invalid monomorphization of `simd_add` intrinsic
+}
+```
+
+The generic type has to be a SIMD type. Example:
+
+```
+#![feature(repr_simd)]
+#![feature(platform_intrinsics)]
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+struct i32x2(i32, i32);
+
+extern "platform-intrinsic" {
+    fn simd_add<T>(a: T, b: T) -> T;
+}
+
+unsafe { simd_add(i32x2(0, 0), i32x2(1, 2)); } // ok!
+```
+"##,
+
+}