compiler-builtins-zynq/src/lib.rs

#![allow(unused_features)]
#![no_std]
#![feature(asm)]
#![feature(core_intrinsics)]
#![feature(naked_functions)]
// TODO(rust-lang/rust#35021) uncomment when that PR lands
// #![feature(rustc_builtins)]

// We disable #[no_mangle] for tests so that we can verify the test results
// against the native compiler-rt implementations of the builtins.

#[cfg(test)]
#[macro_use]
extern crate quickcheck;

#[cfg(target_arch = "arm")]
pub mod arm;

pub mod udiv;
pub mod mul;
pub mod shift;

/// Trait for some basic operations on integers
trait Int {
    fn bits() -> u32;
}

// TODO: Once i128/u128 support lands, we'll want to add impls for those as well
impl Int for u32 {
    fn bits() -> u32 {
        32
    }
}
impl Int for i32 {
    fn bits() -> u32 {
        32
    }
}
impl Int for u64 {
    fn bits() -> u32 {
        64
    }
}
impl Int for i64 {
    fn bits() -> u32 {
        64
    }
}

/// Trait to convert an integer to/from smaller parts
trait LargeInt {
    type LowHalf;
    type HighHalf;

    fn low(self) -> Self::LowHalf;
    fn high(self) -> Self::HighHalf;
    fn from_parts(low: Self::LowHalf, high: Self::HighHalf) -> Self;
}

// TODO: Once i128/u128 support lands, we'll want to add impls for those as well
impl LargeInt for u64 {
    type LowHalf = u32;
    type HighHalf = u32;

    fn low(self) -> u32 {
        self as u32
    }
    fn high(self) -> u32 {
        (self >> 32) as u32
    }
    fn from_parts(low: u32, high: u32) -> u64 {
        low as u64 | ((high as u64) << 32)
    }
}
impl LargeInt for i64 {
    type LowHalf = u32;
    type HighHalf = i32;

    fn low(self) -> u32 {
        self as u32
    }
    fn high(self) -> i32 {
        (self >> 32) as i32
    }
    fn from_parts(low: u32, high: i32) -> i64 {
        low as i64 | ((high as i64) << 32)
    }
}