Trait HalfFloatSliceExt

pub trait HalfFloatSliceExt: SealedHalfFloatSlice {
    // Required methods
    fn reinterpret_cast(&self) -> &[u16];
    fn reinterpret_cast_mut(&mut self) -> &mut [u16];
    fn convert_from_f32_slice(&mut self, src: &[f32]);
    fn convert_from_f64_slice(&mut self, src: &[f64]);
    fn convert_to_f32_slice(&self, dst: &mut [f32]);
    fn convert_to_f64_slice(&self, dst: &mut [f64]);
}

Extensions to [f16] and [bf16] slices to support conversion and reinterpret operations.

This trait is sealed and cannot be implemented outside of this crate.

Required Methods

fn reinterpret_cast(&self) -> &[u16]

Reinterpret 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

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_mut(&mut self) -> &mut [u16]

Reinterpret 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

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 convert_from_f32_slice(&mut self, src: &[f32])

Convert 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 for more information on hardware conversion support.

Panics

This function will panic if the two slices have different lengths.

Examples

// 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_f64_slice(&mut self, src: &[f64])

Convert 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 for more information on hardware conversion support.

Panics

This function will panic if the two slices have different lengths.

Examples

// 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_to_f32_slice(&self, dst: &mut [f32])

Convert 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 for more information on hardware conversion support.

Panics

This function will panic if the two slices have different lengths.

Examples

// 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_f64_slice(&self, dst: &mut [f64])

Convert 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 for more information on hardware conversion support.

Panics

This function will panic if the two slices have different lengths.

Examples

// 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.]);

Implementations on Foreign Types

impl HalfFloatSliceExt for [bf16]

fn reinterpret_cast(&self) -> &[u16]

fn reinterpret_cast_mut(&mut self) -> &mut [u16]

fn convert_from_f32_slice(&mut self, src: &[f32])

fn convert_from_f64_slice(&mut self, src: &[f64])

fn convert_to_f32_slice(&self, dst: &mut [f32])

fn convert_to_f64_slice(&self, dst: &mut [f64])

impl HalfFloatSliceExt for [f16]

fn reinterpret_cast(&self) -> &[u16]

fn reinterpret_cast_mut(&mut self) -> &mut [u16]

fn convert_from_f32_slice(&mut self, src: &[f32])

fn convert_from_f64_slice(&mut self, src: &[f64])

fn convert_to_f32_slice(&self, dst: &mut [f32])

fn convert_to_f64_slice(&self, dst: &mut [f64])

Implementors