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Completely replace LargeInt

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This commit is contained in:
Aaron Kutch
2020-10-12 23:58:55 -05:00
parent d5b7e2b6d3
commit fac884b0c4
5 changed files with 83 additions and 170 deletions
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44
library/compiler-builtins/src/int/mod.rs
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@@ -384,50 +384,6 @@ impl_h_int!(
i64 u64 i128
);
/// Trait to convert an integer to/from smaller parts
pub(crate) trait LargeInt: Int {
type LowHalf: Int;
type HighHalf: Int;
fn low(self) -> Self::LowHalf;
fn low_as_high(low: Self::LowHalf) -> Self::HighHalf;
fn high(self) -> Self::HighHalf;
fn high_as_low(low: Self::HighHalf) -> Self::LowHalf;
fn from_parts(low: Self::LowHalf, high: Self::HighHalf) -> Self;
}
macro_rules! large_int {
($ty:ty, $tylow:ty, $tyhigh:ty, $halfbits:expr) => {
impl LargeInt for $ty {
type LowHalf = $tylow;
type HighHalf = $tyhigh;
fn low(self) -> $tylow {
self as $tylow
}
fn low_as_high(low: $tylow) -> $tyhigh {
low as $tyhigh
}
fn high(self) -> $tyhigh {
(self >> $halfbits) as $tyhigh
}
fn high_as_low(high: $tyhigh) -> $tylow {
high as $tylow
}
fn from_parts(low: $tylow, high: $tyhigh) -> $ty {
low as $ty | ((high as $ty) << $halfbits)
}
}
};
}
large_int!(u32, u16, u16, 16);
large_int!(i32, u16, i16, 16);
large_int!(u64, u32, u32, 32);
large_int!(i64, u32, i32, 32);
large_int!(u128, u64, u64, 64);
large_int!(i128, u64, i64, 64);
/// Trait to express (possibly lossy) casting of integers
pub(crate) trait CastInto<T: Copy>: Copy {
fn cast(self) -> T;