mirror of https://github.com/rust-lang/rust
34 lines
890 B
Rust
34 lines
890 B
Rust
//@ run-pass
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#![feature(repr_simd, intrinsics)]
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extern "rust-intrinsic" {
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fn simd_cast_ptr<T, U>(x: T) -> U;
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fn simd_expose_provenance<T, U>(x: T) -> U;
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fn simd_with_exposed_provenance<T, U>(x: T) -> U;
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}
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#[derive(Copy, Clone)]
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#[repr(simd)]
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struct V<T>([T; 2]);
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fn main() {
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unsafe {
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let mut foo = 4i8;
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let ptr = &mut foo as *mut i8;
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let ptrs = V::<*mut i8>([ptr, core::ptr::null_mut()]);
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// change constness and type
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let const_ptrs: V<*const u8> = simd_cast_ptr(ptrs);
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let exposed_addr: V<usize> = simd_expose_provenance(const_ptrs);
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let with_exposed_provenance: V<*mut i8> = simd_with_exposed_provenance(exposed_addr);
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assert!(const_ptrs.0 == [ptr as *const u8, core::ptr::null()]);
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assert!(exposed_addr.0 == [ptr as usize, 0]);
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assert!(with_exposed_provenance.0 == ptrs.0);
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}
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}
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