Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 952 insertions, 0 deletions

diff --git a/third_party/rust/half/src/slice.rs b/third_party/rust/half/src/slice.rs
new file mode 100644
index 0000000000..3157e6a355
--- /dev/null
+++ b/third_party/rust/half/src/slice.rs
@@ -0,0 +1,952 @@
+//! Contains utility functions and traits to convert between slices of [`u16`] bits and [`f16`] or
+//! [`bf16`] numbers.
+//!
+//! The utility [`HalfBitsSliceExt`] sealed extension trait is implemented for `[u16]` slices,
+//! while the utility [`HalfFloatSliceExt`] sealed extension trait is implemented for both `[f16]`
+//! and `[bf16]` slices. These traits provide efficient conversions and reinterpret casting of
+//! larger buffers of floating point values, and are automatically included in the
+//! [`prelude`][crate::prelude] module.
+
+use crate::{bf16, binary16::convert, f16};
+#[cfg(feature = "alloc")]
+use alloc::vec::Vec;
+use core::slice;
+
+/// Extensions to `[f16]` and `[bf16]` slices to support conversion and reinterpret operations.
+///
+/// This trait is sealed and cannot be implemented outside of this crate.
+pub trait HalfFloatSliceExt: private::SealedHalfFloatSlice {
+    /// Reinterprets a slice of [`f16`] or [`bf16`] numbers as a slice of [`u16`] bits.
+    ///
+    /// This is a zero-copy operation. The reinterpreted slice has the same lifetime and memory
+    /// location as `self`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use half::prelude::*;
+    /// let float_buffer = [f16::from_f32(1.), f16::from_f32(2.), f16::from_f32(3.)];
+    /// let int_buffer = float_buffer.reinterpret_cast();
+    ///
+    /// assert_eq!(int_buffer, [float_buffer[0].to_bits(), float_buffer[1].to_bits(), float_buffer[2].to_bits()]);
+    /// ```
+    fn reinterpret_cast(&self) -> &[u16];
+
+    /// Reinterprets a mutable slice of [`f16`] or [`bf16`] numbers as a mutable slice of [`u16`].
+    /// bits
+    ///
+    /// This is a zero-copy operation. The transmuted slice has the same lifetime as the original,
+    /// which prevents mutating `self` as long as the returned `&mut [u16]` is borrowed.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use half::prelude::*;
+    /// let mut float_buffer = [f16::from_f32(1.), f16::from_f32(2.), f16::from_f32(3.)];
+    ///
+    /// {
+    ///     let int_buffer = float_buffer.reinterpret_cast_mut();
+    ///
+    ///     assert_eq!(int_buffer, [f16::from_f32(1.).to_bits(), f16::from_f32(2.).to_bits(), f16::from_f32(3.).to_bits()]);
+    ///
+    ///     // Mutating the u16 slice will mutating the original
+    ///     int_buffer[0] = 0;
+    /// }
+    ///
+    /// // Note that we need to drop int_buffer before using float_buffer again or we will get a borrow error.
+    /// assert_eq!(float_buffer, [f16::from_f32(0.), f16::from_f32(2.), f16::from_f32(3.)]);
+    /// ```
+    fn reinterpret_cast_mut(&mut self) -> &mut [u16];
+
+    /// Converts all of the elements of a `[f32]` slice into [`f16`] or [`bf16`] values in `self`.
+    ///
+    /// The length of `src` must be the same as `self`.
+    ///
+    /// The conversion operation is vectorized over the slice, meaning the conversion may be more
+    /// efficient than converting individual elements on some hardware that supports SIMD
+    /// conversions. See [crate documentation](crate) for more information on hardware conversion
+    /// support.
+    ///
+    /// # Panics
+    ///
+    /// This function will panic if the two slices have different lengths.
+    ///
+    /// # Examples
+    /// ```rust
+    /// # use half::prelude::*;
+    /// // Initialize an empty buffer
+    /// let mut buffer = [0u16; 4];
+    /// let buffer = buffer.reinterpret_cast_mut::<f16>();
+    ///
+    /// let float_values = [1., 2., 3., 4.];
+    ///
+    /// // Now convert
+    /// buffer.convert_from_f32_slice(&float_values);
+    ///
+    /// assert_eq!(buffer, [f16::from_f32(1.), f16::from_f32(2.), f16::from_f32(3.), f16::from_f32(4.)]);
+    /// ```
+    fn convert_from_f32_slice(&mut self, src: &[f32]);
+
+    /// Converts all of the elements of a `[f64]` slice into [`f16`] or [`bf16`] values in `self`.
+    ///
+    /// The length of `src` must be the same as `self`.
+    ///
+    /// The conversion operation is vectorized over the slice, meaning the conversion may be more
+    /// efficient than converting individual elements on some hardware that supports SIMD
+    /// conversions. See [crate documentation](crate) for more information on hardware conversion
+    /// support.
+    ///
+    /// # Panics
+    ///
+    /// This function will panic if the two slices have different lengths.
+    ///
+    /// # Examples
+    /// ```rust
+    /// # use half::prelude::*;
+    /// // Initialize an empty buffer
+    /// let mut buffer = [0u16; 4];
+    /// let buffer = buffer.reinterpret_cast_mut::<f16>();
+    ///
+    /// let float_values = [1., 2., 3., 4.];
+    ///
+    /// // Now convert
+    /// buffer.convert_from_f64_slice(&float_values);
+    ///
+    /// assert_eq!(buffer, [f16::from_f64(1.), f16::from_f64(2.), f16::from_f64(3.), f16::from_f64(4.)]);
+    /// ```
+    fn convert_from_f64_slice(&mut self, src: &[f64]);
+
+    /// Converts all of the [`f16`] or [`bf16`] elements of `self` into [`f32`] values in `dst`.
+    ///
+    /// The length of `src` must be the same as `self`.
+    ///
+    /// The conversion operation is vectorized over the slice, meaning the conversion may be more
+    /// efficient than converting individual elements on some hardware that supports SIMD
+    /// conversions. See [crate documentation](crate) for more information on hardware conversion
+    /// support.
+    ///
+    /// # Panics
+    ///
+    /// This function will panic if the two slices have different lengths.
+    ///
+    /// # Examples
+    /// ```rust
+    /// # use half::prelude::*;
+    /// // Initialize an empty buffer
+    /// let mut buffer = [0f32; 4];
+    ///
+    /// let half_values = [f16::from_f32(1.), f16::from_f32(2.), f16::from_f32(3.), f16::from_f32(4.)];
+    ///
+    /// // Now convert
+    /// half_values.convert_to_f32_slice(&mut buffer);
+    ///
+    /// assert_eq!(buffer, [1., 2., 3., 4.]);
+    /// ```
+    fn convert_to_f32_slice(&self, dst: &mut [f32]);
+
+    /// Converts all of the [`f16`] or [`bf16`] elements of `self` into [`f64`] values in `dst`.
+    ///
+    /// The length of `src` must be the same as `self`.
+    ///
+    /// The conversion operation is vectorized over the slice, meaning the conversion may be more
+    /// efficient than converting individual elements on some hardware that supports SIMD
+    /// conversions. See [crate documentation](crate) for more information on hardware conversion
+    /// support.
+    ///
+    /// # Panics
+    ///
+    /// This function will panic if the two slices have different lengths.
+    ///
+    /// # Examples
+    /// ```rust
+    /// # use half::prelude::*;
+    /// // Initialize an empty buffer
+    /// let mut buffer = [0f64; 4];
+    ///
+    /// let half_values = [f16::from_f64(1.), f16::from_f64(2.), f16::from_f64(3.), f16::from_f64(4.)];
+    ///
+    /// // Now convert
+    /// half_values.convert_to_f64_slice(&mut buffer);
+    ///
+    /// assert_eq!(buffer, [1., 2., 3., 4.]);
+    /// ```
+    fn convert_to_f64_slice(&self, dst: &mut [f64]);
+
+    // Because trait is sealed, we can get away with different interfaces between features.
+
+    /// Converts all of the [`f16`] or [`bf16`] elements of `self` into [`f32`] values in a new
+    /// vector
+    ///
+    /// The conversion operation is vectorized over the slice, meaning the conversion may be more
+    /// efficient than converting individual elements on some hardware that supports SIMD
+    /// conversions. See [crate documentation](crate) for more information on hardware conversion
+    /// support.
+    ///
+    /// This method is only available with the `std` or `alloc` feature.
+    ///
+    /// # Examples
+    /// ```rust
+    /// # use half::prelude::*;
+    /// let half_values = [f16::from_f32(1.), f16::from_f32(2.), f16::from_f32(3.), f16::from_f32(4.)];
+    /// let vec = half_values.to_f32_vec();
+    ///
+    /// assert_eq!(vec, vec![1., 2., 3., 4.]);
+    /// ```
+    #[cfg(any(feature = "alloc", feature = "std"))]
+    #[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
+    fn to_f32_vec(&self) -> Vec<f32>;
+
+    /// Converts all of the [`f16`] or [`bf16`] elements of `self` into [`f64`] values in a new
+    /// vector.
+    ///
+    /// The conversion operation is vectorized over the slice, meaning the conversion may be more
+    /// efficient than converting individual elements on some hardware that supports SIMD
+    /// conversions. See [crate documentation](crate) for more information on hardware conversion
+    /// support.
+    ///
+    /// This method is only available with the `std` or `alloc` feature.
+    ///
+    /// # Examples
+    /// ```rust
+    /// # use half::prelude::*;
+    /// let half_values = [f16::from_f64(1.), f16::from_f64(2.), f16::from_f64(3.), f16::from_f64(4.)];
+    /// let vec = half_values.to_f64_vec();
+    ///
+    /// assert_eq!(vec, vec![1., 2., 3., 4.]);
+    /// ```
+    #[cfg(feature = "alloc")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
+    fn to_f64_vec(&self) -> Vec<f64>;
+}
+
+/// Extensions to `[u16]` slices to support reinterpret operations.
+///
+/// This trait is sealed and cannot be implemented outside of this crate.
+pub trait HalfBitsSliceExt: private::SealedHalfBitsSlice {
+    /// Reinterprets a slice of [`u16`] bits as a slice of [`f16`] or [`bf16`] numbers.
+    ///
+    /// `H` is the type to cast to, and must be either the [`f16`] or [`bf16`] type.
+    ///
+    /// This is a zero-copy operation. The reinterpreted slice has the same lifetime and memory
+    /// location as `self`.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use half::prelude::*;
+    /// let int_buffer = [f16::from_f32(1.).to_bits(), f16::from_f32(2.).to_bits(), f16::from_f32(3.).to_bits()];
+    /// let float_buffer: &[f16] = int_buffer.reinterpret_cast();
+    ///
+    /// assert_eq!(float_buffer, [f16::from_f32(1.), f16::from_f32(2.), f16::from_f32(3.)]);
+    ///
+    /// // You may have to specify the cast type directly if the compiler can't infer the type.
+    /// // The following is also valid in Rust.
+    /// let typed_buffer = int_buffer.reinterpret_cast::<f16>();
+    /// ```
+    fn reinterpret_cast<H>(&self) -> &[H]
+    where
+        H: crate::private::SealedHalf;
+
+    /// Reinterprets a mutable slice of [`u16`] bits as a mutable slice of [`f16`] or [`bf16`]
+    /// numbers.
+    ///
+    /// `H` is the type to cast to, and must be either the [`f16`] or [`bf16`] type.
+    ///
+    /// This is a zero-copy operation. The transmuted slice has the same lifetime as the original,
+    /// which prevents mutating `self` as long as the returned `&mut [f16]` is borrowed.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use half::prelude::*;
+    /// let mut int_buffer = [f16::from_f32(1.).to_bits(), f16::from_f32(2.).to_bits(), f16::from_f32(3.).to_bits()];
+    ///
+    /// {
+    ///     let float_buffer: &mut [f16] = int_buffer.reinterpret_cast_mut();
+    ///
+    ///     assert_eq!(float_buffer, [f16::from_f32(1.), f16::from_f32(2.), f16::from_f32(3.)]);
+    ///
+    ///     // Mutating the f16 slice will mutating the original
+    ///     float_buffer[0] = f16::from_f32(0.);
+    /// }
+    ///
+    /// // Note that we need to drop float_buffer before using int_buffer again or we will get a borrow error.
+    /// assert_eq!(int_buffer, [f16::from_f32(0.).to_bits(), f16::from_f32(2.).to_bits(), f16::from_f32(3.).to_bits()]);
+    ///
+    /// // You may have to specify the cast type directly if the compiler can't infer the type.
+    /// // The following is also valid in Rust.
+    /// let typed_buffer = int_buffer.reinterpret_cast_mut::<f16>();
+    /// ```
+    fn reinterpret_cast_mut<H>(&mut self) -> &mut [H]
+    where
+        H: crate::private::SealedHalf;
+}
+
+mod private {
+    use crate::{bf16, f16};
+
+    pub trait SealedHalfFloatSlice {}
+    impl SealedHalfFloatSlice for [f16] {}
+    impl SealedHalfFloatSlice for [bf16] {}
+
+    pub trait SealedHalfBitsSlice {}
+    impl SealedHalfBitsSlice for [u16] {}
+}
+
+impl HalfFloatSliceExt for [f16] {
+    #[inline]
+    fn reinterpret_cast(&self) -> &[u16] {
+        let pointer = self.as_ptr() as *const u16;
+        let length = self.len();
+        // SAFETY: We are reconstructing full length of original slice, using its same lifetime,
+        // and the size of elements are identical
+        unsafe { slice::from_raw_parts(pointer, length) }
+    }
+
+    #[inline]
+    fn reinterpret_cast_mut(&mut self) -> &mut [u16] {
+        let pointer = self.as_ptr() as *mut u16;
+        let length = self.len();
+        // SAFETY: We are reconstructing full length of original slice, using its same lifetime,
+        // and the size of elements are identical
+        unsafe { slice::from_raw_parts_mut(pointer, length) }
+    }
+
+    fn convert_from_f32_slice(&mut self, src: &[f32]) {
+        assert_eq!(
+            self.len(),
+            src.len(),
+            "destination and source slices have different lengths"
+        );
+
+        let mut chunks = src.chunks_exact(4);
+        let mut chunk_count = 0usize; // Not using .enumerate() because we need this value for remainder
+        for chunk in &mut chunks {
+            let vec = convert::f32x4_to_f16x4(chunk);
+            let dst_idx = chunk_count * 4;
+            self[dst_idx..dst_idx + 4].copy_from_slice(vec.reinterpret_cast());
+            chunk_count += 1;
+        }
+
+        // Process remainder
+        if !chunks.remainder().is_empty() {
+            let mut buf = [0f32; 4];
+            buf[..chunks.remainder().len()].copy_from_slice(chunks.remainder());
+            let vec = convert::f32x4_to_f16x4(&buf);
+            let dst_idx = chunk_count * 4;
+            self[dst_idx..dst_idx + chunks.remainder().len()]
+                .copy_from_slice(vec[..chunks.remainder().len()].reinterpret_cast());
+        }
+    }
+
+    fn convert_from_f64_slice(&mut self, src: &[f64]) {
+        assert_eq!(
+            self.len(),
+            src.len(),
+            "destination and source slices have different lengths"
+        );
+
+        let mut chunks = src.chunks_exact(4);
+        let mut chunk_count = 0usize; // Not using .enumerate() because we need this value for remainder
+        for chunk in &mut chunks {
+            let vec = convert::f64x4_to_f16x4(chunk);
+            let dst_idx = chunk_count * 4;
+            self[dst_idx..dst_idx + 4].copy_from_slice(vec.reinterpret_cast());
+            chunk_count += 1;
+        }
+
+        // Process remainder
+        if !chunks.remainder().is_empty() {
+            let mut buf = [0f64; 4];
+            buf[..chunks.remainder().len()].copy_from_slice(chunks.remainder());
+            let vec = convert::f64x4_to_f16x4(&buf);
+            let dst_idx = chunk_count * 4;
+            self[dst_idx..dst_idx + chunks.remainder().len()]
+                .copy_from_slice(vec[..chunks.remainder().len()].reinterpret_cast());
+        }
+    }
+
+    fn convert_to_f32_slice(&self, dst: &mut [f32]) {
+        assert_eq!(
+            self.len(),
+            dst.len(),
+            "destination and source slices have different lengths"
+        );
+
+        let mut chunks = self.chunks_exact(4);
+        let mut chunk_count = 0usize; // Not using .enumerate() because we need this value for remainder
+        for chunk in &mut chunks {
+            let vec = convert::f16x4_to_f32x4(chunk.reinterpret_cast());
+            let dst_idx = chunk_count * 4;
+            dst[dst_idx..dst_idx + 4].copy_from_slice(&vec);
+            chunk_count += 1;
+        }
+
+        // Process remainder
+        if !chunks.remainder().is_empty() {
+            let mut buf = [0u16; 4];
+            buf[..chunks.remainder().len()].copy_from_slice(chunks.remainder().reinterpret_cast());
+            let vec = convert::f16x4_to_f32x4(&buf);
+            let dst_idx = chunk_count * 4;
+            dst[dst_idx..dst_idx + chunks.remainder().len()]
+                .copy_from_slice(&vec[..chunks.remainder().len()]);
+        }
+    }
+
+    fn convert_to_f64_slice(&self, dst: &mut [f64]) {
+        assert_eq!(
+            self.len(),
+            dst.len(),
+            "destination and source slices have different lengths"
+        );
+
+        let mut chunks = self.chunks_exact(4);
+        let mut chunk_count = 0usize; // Not using .enumerate() because we need this value for remainder
+        for chunk in &mut chunks {
+            let vec = convert::f16x4_to_f64x4(chunk.reinterpret_cast());
+            let dst_idx = chunk_count * 4;
+            dst[dst_idx..dst_idx + 4].copy_from_slice(&vec);
+            chunk_count += 1;
+        }
+
+        // Process remainder
+        if !chunks.remainder().is_empty() {
+            let mut buf = [0u16; 4];
+            buf[..chunks.remainder().len()].copy_from_slice(chunks.remainder().reinterpret_cast());
+            let vec = convert::f16x4_to_f64x4(&buf);
+            let dst_idx = chunk_count * 4;
+            dst[dst_idx..dst_idx + chunks.remainder().len()]
+                .copy_from_slice(&vec[..chunks.remainder().len()]);
+        }
+    }
+
+    #[cfg(any(feature = "alloc", feature = "std"))]
+    #[inline]
+    fn to_f32_vec(&self) -> Vec<f32> {
+        let mut vec = Vec::with_capacity(self.len());
+        // SAFETY: convert will initialize every value in the vector without reading them,
+        // so this is safe to do instead of double initialize from resize, and we're setting it to
+        // same value as capacity.
+        unsafe { vec.set_len(self.len()) };
+        self.convert_to_f32_slice(&mut vec);
+        vec
+    }
+
+    #[cfg(any(feature = "alloc", feature = "std"))]
+    #[inline]
+    fn to_f64_vec(&self) -> Vec<f64> {
+        let mut vec = Vec::with_capacity(self.len());
+        // SAFETY: convert will initialize every value in the vector without reading them,
+        // so this is safe to do instead of double initialize from resize, and we're setting it to
+        // same value as capacity.
+        unsafe { vec.set_len(self.len()) };
+        self.convert_to_f64_slice(&mut vec);
+        vec
+    }
+}
+
+impl HalfFloatSliceExt for [bf16] {
+    #[inline]
+    fn reinterpret_cast(&self) -> &[u16] {
+        let pointer = self.as_ptr() as *const u16;
+        let length = self.len();
+        // SAFETY: We are reconstructing full length of original slice, using its same lifetime,
+        // and the size of elements are identical
+        unsafe { slice::from_raw_parts(pointer, length) }
+    }
+
+    #[inline]
+    fn reinterpret_cast_mut(&mut self) -> &mut [u16] {
+        let pointer = self.as_ptr() as *mut u16;
+        let length = self.len();
+        // SAFETY: We are reconstructing full length of original slice, using its same lifetime,
+        // and the size of elements are identical
+        unsafe { slice::from_raw_parts_mut(pointer, length) }
+    }
+
+    fn convert_from_f32_slice(&mut self, src: &[f32]) {
+        assert_eq!(
+            self.len(),
+            src.len(),
+            "destination and source slices have different lengths"
+        );
+
+        // Just use regular loop here until there's any bf16 SIMD support.
+        for (i, f) in src.iter().enumerate() {
+            self[i] = bf16::from_f32(*f);
+        }
+    }
+
+    fn convert_from_f64_slice(&mut self, src: &[f64]) {
+        assert_eq!(
+            self.len(),
+            src.len(),
+            "destination and source slices have different lengths"
+        );
+
+        // Just use regular loop here until there's any bf16 SIMD support.
+        for (i, f) in src.iter().enumerate() {
+            self[i] = bf16::from_f64(*f);
+        }
+    }
+
+    fn convert_to_f32_slice(&self, dst: &mut [f32]) {
+        assert_eq!(
+            self.len(),
+            dst.len(),
+            "destination and source slices have different lengths"
+        );
+
+        // Just use regular loop here until there's any bf16 SIMD support.
+        for (i, f) in self.iter().enumerate() {
+            dst[i] = f.to_f32();
+        }
+    }
+
+    fn convert_to_f64_slice(&self, dst: &mut [f64]) {
+        assert_eq!(
+            self.len(),
+            dst.len(),
+            "destination and source slices have different lengths"
+        );
+
+        // Just use regular loop here until there's any bf16 SIMD support.
+        for (i, f) in self.iter().enumerate() {
+            dst[i] = f.to_f64();
+        }
+    }
+
+    #[cfg(any(feature = "alloc", feature = "std"))]
+    #[inline]
+    fn to_f32_vec(&self) -> Vec<f32> {
+        let mut vec = Vec::with_capacity(self.len());
+        // SAFETY: convert will initialize every value in the vector without reading them,
+        // so this is safe to do instead of double initialize from resize, and we're setting it to
+        // same value as capacity.
+        unsafe { vec.set_len(self.len()) };
+        self.convert_to_f32_slice(&mut vec);
+        vec
+    }
+
+    #[cfg(any(feature = "alloc", feature = "std"))]
+    #[inline]
+    fn to_f64_vec(&self) -> Vec<f64> {
+        let mut vec = Vec::with_capacity(self.len());
+        // SAFETY: convert will initialize every value in the vector without reading them,
+        // so this is safe to do instead of double initialize from resize, and we're setting it to
+        // same value as capacity.
+        unsafe { vec.set_len(self.len()) };
+        self.convert_to_f64_slice(&mut vec);
+        vec
+    }
+}
+
+impl HalfBitsSliceExt for [u16] {
+    // Since we sealed all the traits involved, these are safe.
+    #[inline]
+    fn reinterpret_cast<H>(&self) -> &[H]
+    where
+        H: crate::private::SealedHalf,
+    {
+        let pointer = self.as_ptr() as *const H;
+        let length = self.len();
+        // SAFETY: We are reconstructing full length of original slice, using its same lifetime,
+        // and the size of elements are identical
+        unsafe { slice::from_raw_parts(pointer, length) }
+    }
+
+    #[inline]
+    fn reinterpret_cast_mut<H>(&mut self) -> &mut [H]
+    where
+        H: crate::private::SealedHalf,
+    {
+        let pointer = self.as_mut_ptr() as *mut H;
+        let length = self.len();
+        // SAFETY: We are reconstructing full length of original slice, using its same lifetime,
+        // and the size of elements are identical
+        unsafe { slice::from_raw_parts_mut(pointer, length) }
+    }
+}
+
+#[doc(hidden)]
+#[deprecated(
+    since = "1.4.0",
+    note = "use `HalfBitsSliceExt::reinterpret_cast_mut` instead"
+)]
+#[inline]
+pub fn from_bits_mut(bits: &mut [u16]) -> &mut [f16] {
+    bits.reinterpret_cast_mut()
+}
+
+#[doc(hidden)]
+#[deprecated(
+    since = "1.4.0",
+    note = "use `HalfFloatSliceExt::reinterpret_cast_mut` instead"
+)]
+#[inline]
+pub fn to_bits_mut(bits: &mut [f16]) -> &mut [u16] {
+    bits.reinterpret_cast_mut()
+}
+
+#[doc(hidden)]
+#[deprecated(
+    since = "1.4.0",
+    note = "use `HalfBitsSliceExt::reinterpret_cast` instead"
+)]
+#[inline]
+pub fn from_bits(bits: &[u16]) -> &[f16] {
+    bits.reinterpret_cast()
+}
+
+#[doc(hidden)]
+#[deprecated(
+    since = "1.4.0",
+    note = "use `HalfFloatSliceExt::reinterpret_cast` instead"
+)]
+#[inline]
+pub fn to_bits(bits: &[f16]) -> &[u16] {
+    bits.reinterpret_cast()
+}
+
+#[allow(clippy::float_cmp)]
+#[cfg(test)]
+mod test {
+    use super::{HalfBitsSliceExt, HalfFloatSliceExt};
+    use crate::{bf16, f16};
+
+    #[test]
+    fn test_slice_conversions_f16() {
+        let bits = &[
+            f16::E.to_bits(),
+            f16::PI.to_bits(),
+            f16::EPSILON.to_bits(),
+            f16::FRAC_1_SQRT_2.to_bits(),
+        ];
+        let numbers = &[f16::E, f16::PI, f16::EPSILON, f16::FRAC_1_SQRT_2];
+
+        // Convert from bits to numbers
+        let from_bits = bits.reinterpret_cast::<f16>();
+        assert_eq!(from_bits, numbers);
+
+        // Convert from numbers back to bits
+        let to_bits = from_bits.reinterpret_cast();
+        assert_eq!(to_bits, bits);
+    }
+
+    #[test]
+    fn test_mutablility_f16() {
+        let mut bits_array = [f16::PI.to_bits()];
+        let bits = &mut bits_array[..];
+
+        {
+            // would not compile without these braces
+            let numbers = bits.reinterpret_cast_mut();
+            numbers[0] = f16::E;
+        }
+
+        assert_eq!(bits, &[f16::E.to_bits()]);
+
+        bits[0] = f16::LN_2.to_bits();
+        assert_eq!(bits, &[f16::LN_2.to_bits()]);
+    }
+
+    #[test]
+    fn test_slice_conversions_bf16() {
+        let bits = &[
+            bf16::E.to_bits(),
+            bf16::PI.to_bits(),
+            bf16::EPSILON.to_bits(),
+            bf16::FRAC_1_SQRT_2.to_bits(),
+        ];
+        let numbers = &[bf16::E, bf16::PI, bf16::EPSILON, bf16::FRAC_1_SQRT_2];
+
+        // Convert from bits to numbers
+        let from_bits = bits.reinterpret_cast::<bf16>();
+        assert_eq!(from_bits, numbers);
+
+        // Convert from numbers back to bits
+        let to_bits = from_bits.reinterpret_cast();
+        assert_eq!(to_bits, bits);
+    }
+
+    #[test]
+    fn test_mutablility_bf16() {
+        let mut bits_array = [bf16::PI.to_bits()];
+        let bits = &mut bits_array[..];
+
+        {
+            // would not compile without these braces
+            let numbers = bits.reinterpret_cast_mut();
+            numbers[0] = bf16::E;
+        }
+
+        assert_eq!(bits, &[bf16::E.to_bits()]);
+
+        bits[0] = bf16::LN_2.to_bits();
+        assert_eq!(bits, &[bf16::LN_2.to_bits()]);
+    }
+
+    #[test]
+    fn slice_convert_f16_f32() {
+        // Exact chunks
+        let vf32 = [1., 2., 3., 4., 5., 6., 7., 8.];
+        let vf16 = [
+            f16::from_f32(1.),
+            f16::from_f32(2.),
+            f16::from_f32(3.),
+            f16::from_f32(4.),
+            f16::from_f32(5.),
+            f16::from_f32(6.),
+            f16::from_f32(7.),
+            f16::from_f32(8.),
+        ];
+        let mut buf32 = vf32;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f32_slice(&mut buf32);
+        assert_eq!(&vf32, &buf32);
+
+        buf16.convert_from_f32_slice(&vf32);
+        assert_eq!(&vf16, &buf16);
+
+        // Partial with chunks
+        let vf32 = [1., 2., 3., 4., 5., 6., 7., 8., 9.];
+        let vf16 = [
+            f16::from_f32(1.),
+            f16::from_f32(2.),
+            f16::from_f32(3.),
+            f16::from_f32(4.),
+            f16::from_f32(5.),
+            f16::from_f32(6.),
+            f16::from_f32(7.),
+            f16::from_f32(8.),
+            f16::from_f32(9.),
+        ];
+        let mut buf32 = vf32;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f32_slice(&mut buf32);
+        assert_eq!(&vf32, &buf32);
+
+        buf16.convert_from_f32_slice(&vf32);
+        assert_eq!(&vf16, &buf16);
+
+        // Partial with chunks
+        let vf32 = [1., 2.];
+        let vf16 = [f16::from_f32(1.), f16::from_f32(2.)];
+        let mut buf32 = vf32;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f32_slice(&mut buf32);
+        assert_eq!(&vf32, &buf32);
+
+        buf16.convert_from_f32_slice(&vf32);
+        assert_eq!(&vf16, &buf16);
+    }
+
+    #[test]
+    fn slice_convert_bf16_f32() {
+        // Exact chunks
+        let vf32 = [1., 2., 3., 4., 5., 6., 7., 8.];
+        let vf16 = [
+            bf16::from_f32(1.),
+            bf16::from_f32(2.),
+            bf16::from_f32(3.),
+            bf16::from_f32(4.),
+            bf16::from_f32(5.),
+            bf16::from_f32(6.),
+            bf16::from_f32(7.),
+            bf16::from_f32(8.),
+        ];
+        let mut buf32 = vf32;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f32_slice(&mut buf32);
+        assert_eq!(&vf32, &buf32);
+
+        buf16.convert_from_f32_slice(&vf32);
+        assert_eq!(&vf16, &buf16);
+
+        // Partial with chunks
+        let vf32 = [1., 2., 3., 4., 5., 6., 7., 8., 9.];
+        let vf16 = [
+            bf16::from_f32(1.),
+            bf16::from_f32(2.),
+            bf16::from_f32(3.),
+            bf16::from_f32(4.),
+            bf16::from_f32(5.),
+            bf16::from_f32(6.),
+            bf16::from_f32(7.),
+            bf16::from_f32(8.),
+            bf16::from_f32(9.),
+        ];
+        let mut buf32 = vf32;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f32_slice(&mut buf32);
+        assert_eq!(&vf32, &buf32);
+
+        buf16.convert_from_f32_slice(&vf32);
+        assert_eq!(&vf16, &buf16);
+
+        // Partial with chunks
+        let vf32 = [1., 2.];
+        let vf16 = [bf16::from_f32(1.), bf16::from_f32(2.)];
+        let mut buf32 = vf32;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f32_slice(&mut buf32);
+        assert_eq!(&vf32, &buf32);
+
+        buf16.convert_from_f32_slice(&vf32);
+        assert_eq!(&vf16, &buf16);
+    }
+
+    #[test]
+    fn slice_convert_f16_f64() {
+        // Exact chunks
+        let vf64 = [1., 2., 3., 4., 5., 6., 7., 8.];
+        let vf16 = [
+            f16::from_f64(1.),
+            f16::from_f64(2.),
+            f16::from_f64(3.),
+            f16::from_f64(4.),
+            f16::from_f64(5.),
+            f16::from_f64(6.),
+            f16::from_f64(7.),
+            f16::from_f64(8.),
+        ];
+        let mut buf64 = vf64;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f64_slice(&mut buf64);
+        assert_eq!(&vf64, &buf64);
+
+        buf16.convert_from_f64_slice(&vf64);
+        assert_eq!(&vf16, &buf16);
+
+        // Partial with chunks
+        let vf64 = [1., 2., 3., 4., 5., 6., 7., 8., 9.];
+        let vf16 = [
+            f16::from_f64(1.),
+            f16::from_f64(2.),
+            f16::from_f64(3.),
+            f16::from_f64(4.),
+            f16::from_f64(5.),
+            f16::from_f64(6.),
+            f16::from_f64(7.),
+            f16::from_f64(8.),
+            f16::from_f64(9.),
+        ];
+        let mut buf64 = vf64;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f64_slice(&mut buf64);
+        assert_eq!(&vf64, &buf64);
+
+        buf16.convert_from_f64_slice(&vf64);
+        assert_eq!(&vf16, &buf16);
+
+        // Partial with chunks
+        let vf64 = [1., 2.];
+        let vf16 = [f16::from_f64(1.), f16::from_f64(2.)];
+        let mut buf64 = vf64;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f64_slice(&mut buf64);
+        assert_eq!(&vf64, &buf64);
+
+        buf16.convert_from_f64_slice(&vf64);
+        assert_eq!(&vf16, &buf16);
+    }
+
+    #[test]
+    fn slice_convert_bf16_f64() {
+        // Exact chunks
+        let vf64 = [1., 2., 3., 4., 5., 6., 7., 8.];
+        let vf16 = [
+            bf16::from_f64(1.),
+            bf16::from_f64(2.),
+            bf16::from_f64(3.),
+            bf16::from_f64(4.),
+            bf16::from_f64(5.),
+            bf16::from_f64(6.),
+            bf16::from_f64(7.),
+            bf16::from_f64(8.),
+        ];
+        let mut buf64 = vf64;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f64_slice(&mut buf64);
+        assert_eq!(&vf64, &buf64);
+
+        buf16.convert_from_f64_slice(&vf64);
+        assert_eq!(&vf16, &buf16);
+
+        // Partial with chunks
+        let vf64 = [1., 2., 3., 4., 5., 6., 7., 8., 9.];
+        let vf16 = [
+            bf16::from_f64(1.),
+            bf16::from_f64(2.),
+            bf16::from_f64(3.),
+            bf16::from_f64(4.),
+            bf16::from_f64(5.),
+            bf16::from_f64(6.),
+            bf16::from_f64(7.),
+            bf16::from_f64(8.),
+            bf16::from_f64(9.),
+        ];
+        let mut buf64 = vf64;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f64_slice(&mut buf64);
+        assert_eq!(&vf64, &buf64);
+
+        buf16.convert_from_f64_slice(&vf64);
+        assert_eq!(&vf16, &buf16);
+
+        // Partial with chunks
+        let vf64 = [1., 2.];
+        let vf16 = [bf16::from_f64(1.), bf16::from_f64(2.)];
+        let mut buf64 = vf64;
+        let mut buf16 = vf16;
+
+        vf16.convert_to_f64_slice(&mut buf64);
+        assert_eq!(&vf64, &buf64);
+
+        buf16.convert_from_f64_slice(&vf64);
+        assert_eq!(&vf16, &buf16);
+    }
+
+    #[test]
+    #[should_panic]
+    fn convert_from_f32_slice_len_mismatch_panics() {
+        let mut slice1 = [f16::ZERO; 3];
+        let slice2 = [0f32; 4];
+        slice1.convert_from_f32_slice(&slice2);
+    }
+
+    #[test]
+    #[should_panic]
+    fn convert_from_f64_slice_len_mismatch_panics() {
+        let mut slice1 = [f16::ZERO; 3];
+        let slice2 = [0f64; 4];
+        slice1.convert_from_f64_slice(&slice2);
+    }
+
+    #[test]
+    #[should_panic]
+    fn convert_to_f32_slice_len_mismatch_panics() {
+        let slice1 = [f16::ZERO; 3];
+        let mut slice2 = [0f32; 4];
+        slice1.convert_to_f32_slice(&mut slice2);
+    }
+
+    #[test]
+    #[should_panic]
+    fn convert_to_f64_slice_len_mismatch_panics() {
+        let slice1 = [f16::ZERO; 3];
+        let mut slice2 = [0f64; 4];
+        slice1.convert_to_f64_slice(&mut slice2);
+    }
+}