luaur-vm 0.1.0

The Luau register virtual machine and standard library (Rust).
Documentation 
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use crate::functions::lua_l_checkinteger_64::lua_l_checkinteger_64;
use crate::functions::lua_pushinteger_64::lua_pushinteger_64;
use crate::type_aliases::lua_state::lua_State;

#[no_mangle]
pub unsafe fn int64_arshift(L: *mut lua_State) -> core::ffi::c_int {
    let n = lua_l_checkinteger_64(L, 1);
    let i = lua_l_checkinteger_64(L, 2);

    if i >= -63 && i <= 63 {
        lua_pushinteger_64(
            L,
            if i < 0 {
                ((n as u64) << (-i)) as i64
            } else {
                n >> i
            },
        );
    } else if i < -63 {
        lua_pushinteger_64(L, 0);
    } else {
        lua_pushinteger_64(L, if n < 0 { -1 } else { 0 });
    }

    1
}