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Add niche optimization #49

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79323d7
Only use public interface in tests
Kijewski Sep 5, 2022
3b02c33
Add niche optimization
Kijewski Sep 5, 2022
191510c
FIXUP: distinguish between signed and unsigned bytes
Kijewski Sep 5, 2022
36acdeb
FIXUP: combine signed_bytes and unsigned_bytes
Kijewski Sep 5, 2022
01c5bf3
FIXUP: combine into one file
Kijewski Sep 14, 2022
1c7a8ef
Make every method `#[inline]`
Kijewski Sep 14, 2022
dadb1db
Add layout test
Kijewski Sep 16, 2022
65b6a7e
Cleanup: remove lib core
Kijewski Sep 16, 2022
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113 changes: 55 additions & 58 deletions src/conversion.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,14 +4,16 @@ use crate::*;
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct TryFromIntError(pub(crate) ());

impl From<lib::core::num::TryFromIntError> for TryFromIntError {
fn from(_: lib::core::num::TryFromIntError) -> TryFromIntError {
impl From<core::num::TryFromIntError> for TryFromIntError {
#[inline]
fn from(_: core::num::TryFromIntError) -> TryFromIntError {
TryFromIntError(())
}
}

impl From<lib::core::convert::Infallible> for TryFromIntError {
fn from(_: lib::core::convert::Infallible) -> TryFromIntError {
impl From<core::convert::Infallible> for TryFromIntError {
#[inline]
fn from(_: core::convert::Infallible) -> TryFromIntError {
TryFromIntError(())
}
}
Expand All @@ -23,8 +25,9 @@ macro_rules! implement_from {
{[$($name:ident),*], $from:ident } => {$(implement_from!($name, $from);)*};
{$name:ident, $from:ty} => {
impl From<$from> for $name {
#[inline]
fn from(x: $from) -> $name {
$name(x.into())
unsafe { $name::new_unchecked(x.into()) }
}
}
};
Expand All @@ -38,15 +41,9 @@ macro_rules! implement_try_from {
impl TryFrom<$from> for $name {
type Error = TryFromIntError;

#[inline]
fn try_from(x: $from) -> Result<$name, Self::Error> {
// First get the value into the correct type
let value = x.try_into()?;

if value <= $name::MAX.into() && value >= $name::MIN.into() {
Ok($name(value))
} else {
Err(TryFromIntError(()))
}
Self::try_new(x.try_into()?).ok_or(TryFromIntError(()))
}
}
};
Expand All @@ -57,8 +54,9 @@ macro_rules! implement_into {
{[$($name:ident),*], $from:ident } => {$(implement_into!($name, $from);)*};
{$name:ident, $into:ident} => {
impl From<$name> for $into {
#[inline]
fn from(x: $name) -> $into {
$into::from(x.0)
x.get().into()
}
}
};
Expand All @@ -71,8 +69,9 @@ macro_rules! implement_try_into {
impl TryFrom<$name> for $into {
type Error = TryFromIntError;

#[inline]
fn try_from(x: $name) -> Result<$into, Self::Error> {
Ok($into::try_from(x.0)?)
Ok(x.get().try_into()?)
}
}
};
Expand Down Expand Up @@ -1735,21 +1734,19 @@ implement_from!(
);

impl From<bool> for u1 {
#[inline]
fn from(b: bool) -> Self {
match b {
true => u1(1),
false => u1(0),
}
unsafe { Self::new_unchecked(match b {
true => 1,
false => 0,
}) }
}
}

impl From<u1> for bool {
fn from(u1(x): u1) -> Self {
match x {
0 => false,
1 => true,
_ => unreachable!(),
}
#[inline]
fn from(x: u1) -> Self {
x.get() != 0
}
}

Expand All @@ -1759,45 +1756,45 @@ mod tests {

#[test]
fn test_infallible_conversion_unsigned() {
assert_eq!(u16::from(u9(12)), 12u16);
assert_eq!(u32::from(u9(12)), 12u32);
assert_eq!(u16::from(u9::new(12)), 12u16);
assert_eq!(u32::from(u9::new(12)), 12u32);

assert_eq!(u9(127), 127u8.into());
assert_eq!(u9::new(127), 127u8.into());

assert_eq!(u7::from(u6(65)), u7(65));
assert_eq!(u7::from(u6::new(25)), u7::new(25));
}

#[test]
fn test_infallible_conversion_signed() {
assert_eq!(i16::from(i9(12)), 12i16);
assert_eq!(i32::from(i9(12)), 12i32);
assert_eq!(i16::from(i9::new(12)), 12i16);
assert_eq!(i32::from(i9::new(12)), 12i32);

assert_eq!(i16::from(i9(-12)), -12i16);
assert_eq!(i32::from(i9(-12)), -12i32);
assert_eq!(i16::from(i9::new(-12)), -12i16);
assert_eq!(i32::from(i9::new(-12)), -12i32);

assert_eq!(i9(127), 127i8.into());
assert_eq!(i9::new(127), 127i8.into());

assert_eq!(i7::from(i6(65)), i7(65));
assert_eq!(i7::from(i6(-65)), i7(-65));
assert_eq!(i7::from(i6::new(25)), i7::new(25));
assert_eq!(i7::from(i6::new(-25)), i7::new(-25));
}

#[test]
fn test_fallible_conversion_unsigned() {
assert_eq!(u16::try_from(u9(12)), Ok(12u16));
assert_eq!(u32::try_from(u9(12)), Ok(12u32));
assert_eq!(u16::try_from(u9::new(12)), Ok(12u16));
assert_eq!(u32::try_from(u9::new(12)), Ok(12u32));

assert_eq!(127u8.try_into(), Ok(u9(127)));
assert_eq!(127u8.try_into(), Ok(u9::new(127)));

assert_eq!(u7::try_from(u6(65)), Ok(u7(65)));
assert_eq!(u7::try_from(u6::new(25)), Ok(u7::new(25)));

assert!(u16::try_from(u19(0x1_ffff)).is_err());
assert!(u32::try_from(u39(0x1_fffff_ffff)).is_err());
assert!(u16::try_from(u19::new(0x1_ffff)).is_err());
assert!(u32::try_from(u39::new(0x1_fffff_ffff)).is_err());

assert!(u6::try_from(u7(127)).is_err());
assert!(u6::try_from(u7::new(127)).is_err());

assert_eq!(u2::try_from(1usize), Ok(u2(1)));
assert_eq!(u2::try_from(1usize), Ok(u2::new(1)));
assert!(u2::try_from(4usize).is_err());
assert_eq!(u2(1).try_into(), Ok(1usize));
assert_eq!(u2::new(1).try_into(), Ok(1usize));

// Make sure that uX types behave the same as standard types with regards to usize
// conversion.
Expand All @@ -1809,24 +1806,24 @@ mod tests {

#[test]
fn test_fallible_conversion_signed() {
assert_eq!(i16::try_from(i9(12)), Ok(12i16));
assert_eq!(i32::try_from(i9(12)), Ok(12i32));
assert_eq!(i16::try_from(i9::new(12)), Ok(12i16));
assert_eq!(i32::try_from(i9::new(12)), Ok(12i32));

assert_eq!(i16::try_from(i9(-12)), Ok(-12i16));
assert_eq!(i32::try_from(i9(-12)), Ok(-12i32));
assert_eq!(i16::try_from(i9::new(-12)), Ok(-12i16));
assert_eq!(i32::try_from(i9::new(-12)), Ok(-12i32));

assert_eq!(127i8.try_into(), Ok(i9(127)));
assert_eq!(127i8.try_into(), Ok(i9::new(127)));

assert_eq!(i7::try_from(i6(65)), Ok(i7(65)));
assert_eq!(i7::try_from(i6(-65)), Ok(i7(-65)));
assert_eq!(i7::try_from(i6::new(25)), Ok(i7::new(25)));
assert_eq!(i7::try_from(i6::new(-25)), Ok(i7::new(-25)));

assert!(i16::try_from(i19(0xffff)).is_err());
assert!(i32::try_from(i39(0xffff_ffff)).is_err());
assert!(i16::try_from(i19::new(0xffff)).is_err());
assert!(i32::try_from(i39::new(0xffff_ffff)).is_err());

assert!(i16::try_from(i19(-0xffff)).is_err());
assert!(i32::try_from(i39(-0xffff_ffff)).is_err());
assert!(i16::try_from(i19::new(-0xffff)).is_err());
assert!(i32::try_from(i39::new(-0xffff_ffff)).is_err());

assert!(i6::try_from(i7(64)).is_err());
assert!(i6::try_from(i7(-64)).is_err());
assert!(i6::try_from(i7::new(63)).is_err());
assert!(i6::try_from(i7::new(-64)).is_err());
}
}
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