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Invalid monomorphization of an intrinsic function was used.
Erroneous code example:
```compile_fail,E0511
#![feature(intrinsics)]
#[rustc_intrinsic]
unsafe 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(intrinsics)]
#[repr(simd)]
#[derive(Copy, Clone)]
struct i32x2([i32; 2]);
#[rustc_intrinsic]
unsafe fn simd_add<T>(a: T, b: T) -> T;
unsafe { simd_add(i32x2([0, 0]), i32x2([1, 2])); } // ok!
```
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