80 lines
1.7 KiB
Rust
80 lines
1.7 KiB
Rust
macro_rules! hty {
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($ty:ty) => {
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<$ty as LargeInt>::HighHalf
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}
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}
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macro_rules! os_ty {
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($ty:ty) => {
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<$ty as Int>::OtherSign
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}
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}
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pub mod mul;
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pub mod sdiv;
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pub mod shift;
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pub mod udiv;
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/// Trait for some basic operations on integers
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pub trait Int {
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/// Type with the same width but other signedness
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type OtherSign;
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/// Returns the bitwidth of the int type
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fn bits() -> u32;
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}
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macro_rules! int_impl {
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($ity:ty, $sty:ty, $bits:expr) => {
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impl Int for $ity {
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type OtherSign = $sty;
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fn bits() -> u32 {
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$bits
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}
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}
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impl Int for $sty {
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type OtherSign = $ity;
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fn bits() -> u32 {
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$bits
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}
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}
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}
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}
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int_impl!(i32, u32, 32);
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int_impl!(i64, u64, 64);
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int_impl!(i128, u128, 128);
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/// Trait to convert an integer to/from smaller parts
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pub trait LargeInt {
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type LowHalf;
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type HighHalf;
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fn low(self) -> Self::LowHalf;
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fn high(self) -> Self::HighHalf;
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fn from_parts(low: Self::LowHalf, high: Self::HighHalf) -> Self;
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}
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macro_rules! large_int {
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($ty:ty, $tylow:ty, $tyhigh:ty, $halfbits:expr) => {
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impl LargeInt for $ty {
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type LowHalf = $tylow;
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type HighHalf = $tyhigh;
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fn low(self) -> $tylow {
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self as $tylow
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}
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fn high(self) -> $tyhigh {
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(self >> $halfbits) as $tyhigh
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}
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fn from_parts(low: $tylow, high: $tyhigh) -> $ty {
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low as $ty | ((high as $ty) << $halfbits)
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}
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}
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}
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}
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large_int!(u64, u32, u32, 32);
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large_int!(i64, u32, i32, 32);
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large_int!(u128, u64, u64, 64);
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large_int!(i128, u64, i64, 64);
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