src/test/run-make-fulldeps/simd-ffi/simd.rs

// ensures that public symbols are not removed completely
#![crate_type = "lib"]
// we can compile to a variety of platforms, because we don't need
// cross-compiled standard libraries.
#![feature(no_core, optin_builtin_traits)]
#![no_core]

#![feature(repr_simd, simd_ffi, link_llvm_intrinsics, lang_items, rustc_attrs)]


#[repr(C)]
#[derive(Copy)]
#[repr(simd)]
pub struct f32x4(f32, f32, f32, f32);


extern {
    #[link_name = "llvm.sqrt.v4f32"]
    fn vsqrt(x: f32x4) -> f32x4;
}

pub fn foo(x: f32x4) -> f32x4 {
    unsafe {vsqrt(x)}
}

#[repr(C)]
#[derive(Copy)]
#[repr(simd)]
pub struct i32x4(i32, i32, i32, i32);


extern {
    // _mm_sll_epi32
    #[cfg(any(target_arch = "x86",
              target_arch = "x86-64"))]
    #[link_name = "llvm.x86.sse2.psll.d"]
    fn integer(a: i32x4, b: i32x4) -> i32x4;

    // vmaxq_s32
    #[cfg(target_arch = "arm")]
    #[link_name = "llvm.arm.neon.vmaxs.v4i32"]
    fn integer(a: i32x4, b: i32x4) -> i32x4;
    // vmaxq_s32
    #[cfg(target_arch = "aarch64")]
    #[link_name = "llvm.aarch64.neon.maxs.v4i32"]
    fn integer(a: i32x4, b: i32x4) -> i32x4;

    // just some substitute foreign symbol, not an LLVM intrinsic; so
    // we still get type checking, but not as detailed as (ab)using
    // LLVM.
    #[cfg(not(any(target_arch = "x86",
                  target_arch = "x86-64",
                  target_arch = "arm",
                  target_arch = "aarch64")))]
    fn integer(a: i32x4, b: i32x4) -> i32x4;
}

pub fn bar(a: i32x4, b: i32x4) -> i32x4 {
    unsafe {integer(a, b)}
}

#[lang = "sized"]
pub trait Sized { }

#[lang = "copy"]
pub trait Copy { }

impl Copy for f32 {}
impl Copy for i32 {}

pub mod marker {
    pub use Copy;
}

#[lang = "freeze"]
auto trait Freeze {}

#[macro_export]
#[rustc_builtin_macro]
macro_rules! Copy { () => () }