rust/compiler/rustc_codegen_gcc/example/mod_bench.rs

#![feature(start, core_intrinsics, lang_items)]
#![no_std]
#![allow(internal_features)]

#[link(name = "c")]
extern {}

#[panic_handler]
fn panic_handler(_: &core::panic::PanicInfo) -> ! {
    core::intrinsics::abort();
}

#[lang="eh_personality"]
fn eh_personality(){}

// Required for rustc_codegen_llvm
#[no_mangle]
unsafe extern "C" fn _Unwind_Resume() {
    core::intrinsics::unreachable();
}

#[start]
fn main(_argc: isize, _argv: *const *const u8) -> isize {
    for i in 2..100_000_000 {
        black_box((i + 1) % i);
    }

    0
}

#[inline(never)]
fn black_box(i: u32) {
    if i != 1 {
        core::intrinsics::abort();
    }
}