rust/tests/ui/rfcs/rfc-2396-target_feature-11/check-pass.rs

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2020-05-01 13:32:28 +00:00
// Tests the new rules added by RFC 2396, including:
// - applying `#[target_feature]` to safe functions is allowed
// - calling functions with `#[target_feature]` is allowed in
// functions which have (at least) the same features
// - calling functions with `#[target_feature]` is allowed in
// unsafe contexts
// - functions with `#[target_feature]` can coerce to unsafe fn pointers
// check-pass
// only-x86_64
// revisions: mir thir
// [thir]compile-flags: -Z thir-unsafeck
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#![feature(target_feature_11)]
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#[target_feature(enable = "sse2")]
const fn sse2() {}
#[cfg(target_feature = "sse2")]
const SSE2_ONLY: () = unsafe {
sse2();
};
#[target_feature(enable = "sse2")]
fn also_sse2() {
sse2();
}
#[target_feature(enable = "sse2")]
#[target_feature(enable = "avx")]
fn sse2_and_avx() {
sse2();
}
struct Foo;
impl Foo {
#[target_feature(enable = "sse2")]
fn sse2(&self) {
sse2();
}
}
fn main() {
if cfg!(target_feature = "sse2") {
unsafe {
sse2();
Foo.sse2();
}
}
let sse2_ptr: unsafe fn() = sse2;
}