diff options
Diffstat (limited to 'library/portable-simd/crates/test_helpers/src/biteq.rs')
-rw-r--r-- | library/portable-simd/crates/test_helpers/src/biteq.rs | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/library/portable-simd/crates/test_helpers/src/biteq.rs b/library/portable-simd/crates/test_helpers/src/biteq.rs new file mode 100644 index 000000000..00350e224 --- /dev/null +++ b/library/portable-simd/crates/test_helpers/src/biteq.rs @@ -0,0 +1,106 @@ +//! Compare numeric types by exact bit value. + +pub trait BitEq { + fn biteq(&self, other: &Self) -> bool; + fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result; +} + +impl BitEq for bool { + fn biteq(&self, other: &Self) -> bool { + self == other + } + + fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { + write!(f, "{:?}", self) + } +} + +macro_rules! impl_integer_biteq { + { $($type:ty),* } => { + $( + impl BitEq for $type { + fn biteq(&self, other: &Self) -> bool { + self == other + } + + fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { + write!(f, "{:?} ({:x})", self, self) + } + } + )* + }; +} + +impl_integer_biteq! { u8, u16, u32, u64, u128, usize, i8, i16, i32, i64, i128, isize } + +macro_rules! impl_float_biteq { + { $($type:ty),* } => { + $( + impl BitEq for $type { + fn biteq(&self, other: &Self) -> bool { + if self.is_nan() && other.is_nan() { + true // exact nan bits don't matter + } else { + self.to_bits() == other.to_bits() + } + } + + fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { + write!(f, "{:?} ({:x})", self, self.to_bits()) + } + } + )* + }; +} + +impl_float_biteq! { f32, f64 } + +impl<T: BitEq, const N: usize> BitEq for [T; N] { + fn biteq(&self, other: &Self) -> bool { + self.iter() + .zip(other.iter()) + .fold(true, |value, (left, right)| value && left.biteq(right)) + } + + fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { + #[repr(transparent)] + struct Wrapper<'a, T: BitEq>(&'a T); + + impl<T: BitEq> core::fmt::Debug for Wrapper<'_, T> { + fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { + self.0.fmt(f) + } + } + + f.debug_list() + .entries(self.iter().map(|x| Wrapper(x))) + .finish() + } +} + +#[doc(hidden)] +pub struct BitEqWrapper<'a, T>(pub &'a T); + +impl<T: BitEq> PartialEq for BitEqWrapper<'_, T> { + fn eq(&self, other: &Self) -> bool { + self.0.biteq(other.0) + } +} + +impl<T: BitEq> core::fmt::Debug for BitEqWrapper<'_, T> { + fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result { + self.0.fmt(f) + } +} + +#[macro_export] +macro_rules! prop_assert_biteq { + { $a:expr, $b:expr $(,)? } => { + { + use $crate::biteq::BitEqWrapper; + let a = $a; + let b = $b; + proptest::prop_assert_eq!(BitEqWrapper(&a), BitEqWrapper(&b)); + } + } +} |