mirror of https://github.com/rust-lang/rust
43 lines
865 B
Rust
43 lines
865 B
Rust
//@ only-x86_64
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//@ run-pass
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//@ needs-asm-support
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#![feature(asm_const)]
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use std::arch::{asm, global_asm};
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fn const_generic<const X: usize>() -> usize {
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unsafe {
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let a: usize;
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asm!("mov {}, {}", out(reg) a, const X);
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a
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}
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}
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const fn constfn(x: usize) -> usize {
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x
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}
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fn main() {
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unsafe {
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let a: usize;
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asm!("mov {}, {}", out(reg) a, const 5);
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assert_eq!(a, 5);
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let b: usize;
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asm!("mov {}, {}", out(reg) b, const constfn(5));
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assert_eq!(b, 5);
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let c: usize;
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asm!("mov {}, {}", out(reg) c, const constfn(5) + constfn(5));
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assert_eq!(c, 10);
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}
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let d = const_generic::<5>();
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assert_eq!(d, 5);
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}
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global_asm!("mov eax, {}", const 5);
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global_asm!("mov eax, {}", const constfn(5));
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global_asm!("mov eax, {}", const constfn(5) + constfn(5));
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