gcc/testsuite/rust/execute/torture/ctlz_nonzero.rs

#![feature(no_core)]
#![no_core]
#![feature(intrinsics)]
#![feature(lang_items)]

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

extern "rust-intrinsic" {
    pub fn ctlz_nonzero<T>(x: T) -> u32;
    pub fn abort() -> !;
}

fn main() -> i32 {
    unsafe {
        if ctlz_nonzero(1u8) != 7 {
            abort();
        }
        if ctlz_nonzero(255u8) != 0 {
            abort();
        }

        if ctlz_nonzero(1u16) != 15 {
            abort();
        }
        if ctlz_nonzero(0xFFFFu16) != 0 {
            abort();
        }

        if ctlz_nonzero(1u32) != 31 {
            abort();
        }
        if ctlz_nonzero(0xFFFFFFFFu32) != 0 {
            abort();
        }

        if ctlz_nonzero(1u64) != 63 {
            abort();
        }
        if ctlz_nonzero(!0u64) != 0 {
            abort();
        }
    }

    0
}