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//! Safe but somewhat low-level variants of the comparison operations in CFAVML.
//!
//! In general, I would recommend using the higher level generic functions api which provides
//! some syntax sugar over these traits.
use crate::buffer::WriteOnlyBuffer;
use crate::danger::export_cmp_ops;
/// Various comparison operations over vectors.
pub trait CmpOps: Sized {
/// Finds the horizontal max element of a given vector and returns the result.
///
/// ### Pseudocode
///
/// ```ignore
/// result = -inf
///
/// for i in range(dims):
/// result = max(result, a[i])
///
/// return result
/// ```
///
/// ### Panics
///
/// Panics if the size of vector `a` does not match `dims`.
fn max_horizontal(dims: usize, a: &[Self]) -> Self;
/// Performs an element wise max on each element of vector `a` and the provided broadcast
/// value, writing the result to `result`.
///
/// ### Pseudocode
///
/// ```ignore
/// result = [0; dims]
///
/// for i in range(dims):
/// result[i] = max(value, a[i])
///
/// return result
/// ```
///
/// ### Result buffer
///
/// The result buffer can be either an initialized slice i.e. [`&mut [Self]`]
/// or it can be a slice holding potentially uninitialized data i.e. [`&mut [MaybeUninit<Self>]`].
///
/// Once the operation is complete, it is safe to assume the data written is fully initialized.
///
/// ### Panics
///
/// Panics if the size of vector `a` or `result` does not match `dims`.
fn max_value<B>(dims: usize, value: Self, a: &[Self], result: &mut [B])
where
for<'a> &'a mut [B]: WriteOnlyBuffer<Item = Self>;
/// Performs an element wise max on each element of vector `a` and `b`,
/// writing the result to `result`.
///
/// ### Pseudocode
///
/// ```ignore
/// result = [0; dims]
///
/// for i in range(dims):
/// result[i] = max(a[i], b[i])
///
/// return result
/// ```
///
/// ### Result buffer
///
/// The result buffer can be either an initialized slice i.e. [`&mut [Self]`]
/// or it can be a slice holding potentially uninitialized data i.e. [`&mut [MaybeUninit<Self>]`].
///
/// Once the operation is complete, it is safe to assume the data written is fully initialized.
///
/// ### Panics
///
/// Panics if the size of vector `a`, `b` or `result` does not match `dims`.
fn max_vector<B>(dims: usize, a: &[Self], b: &[Self], result: &mut [B])
where
for<'a> &'a mut [B]: WriteOnlyBuffer<Item = Self>;
/// Finds the horizontal min element of a given vector.
///
/// ### Pseudocode
///
/// ```ignore
/// result = inf
///
/// for i in range(dims):
/// result = min(result, a[i])
///
/// return result
/// ```
fn min_horizontal(dims: usize, a: &[Self]) -> Self;
/// Performs an element wise min on each element of vector `a` and the provided broadcast
/// value, writing the result to `result`.
///
/// ### Pseudocode
///
/// ```ignore
/// result = [0; dims]
///
/// for i in range(dims):
/// result[i] = min(value, a[i])
///
/// return result
/// ```
///
/// ### Result buffer
///
/// The result buffer can be either an initialized slice i.e. [`&mut [Self]`]
/// or it can be a slice holding potentially uninitialized data i.e. [`&mut [MaybeUninit<Self>]`].
///
/// Once the operation is complete, it is safe to assume the data written is fully initialized.
///
/// ### Panics
///
/// Panics if the size of vector `a` or `result` does not match `dims`.
fn min_value<B>(dims: usize, value: Self, a: &[Self], result: &mut [B])
where
for<'a> &'a mut [B]: WriteOnlyBuffer<Item = Self>;
/// Performs an element wise min on each element of vector `a` and `b`,
/// writing the result to `result`.
///
/// ### Pseudocode
///
/// ```ignore
/// result = [0; dims]
///
/// for i in range(dims):
/// result[i] = min(a[i], b[i])
///
/// return result
/// ```
///
/// ### Result buffer
///
/// The result buffer can be either an initialized slice i.e. [`&mut [Self]`]
/// or it can be a slice holding potentially uninitialized data i.e. [`&mut [MaybeUninit<Self>]`].
///
/// Once the operation is complete, it is safe to assume the data written is fully initialized.
///
/// ### Panics
///
/// Panics if the size of vector `a`, `b` or `result` does not match `dims`.
fn min_vector<B>(dims: usize, a: &[Self], b: &[Self], result: &mut [B])
where
for<'a> &'a mut [B]: WriteOnlyBuffer<Item = Self>;
}
macro_rules! cmp_ops {
($t:ty) => {
impl CmpOps for $t {
fn max_horizontal(dims: usize, a: &[Self]) -> Self {
assert_eq!(a.len(), dims, "Input vector `a` does not match size `dims`");
unsafe {
crate::dispatch!(
avx512 = export_cmp_ops::generic_avx512_max_horizontal,
avx2 = export_cmp_ops::generic_avx2_max_horizontal,
neon = export_cmp_ops::generic_neon_max_horizontal,
fallback = export_cmp_ops::generic_fallback_max_horizontal,
args = (dims, a)
)
}
}
fn max_value<B>(dims: usize, value: Self, a: &[Self], result: &mut [B])
where
for<'a> &'a mut [B]: WriteOnlyBuffer<Item = Self>,
{
assert_eq!(a.len(), dims, "Input vector `a` does not match size `dims`");
assert_eq!(
result.len(),
dims,
"Input vector `result` does not match size `dims`"
);
unsafe {
crate::dispatch!(
avx512 = export_cmp_ops::generic_avx512_max_value,
avx2 = export_cmp_ops::generic_avx2_max_value,
neon = export_cmp_ops::generic_neon_max_value,
fallback = export_cmp_ops::generic_fallback_max_value,
args = (dims, value, a, result)
)
}
}
fn max_vector<B>(dims: usize, a: &[Self], b: &[Self], result: &mut [B])
where
for<'a> &'a mut [B]: WriteOnlyBuffer<Item = Self>,
{
assert_eq!(a.len(), dims, "Input vector `a` does not match size `dims`");
assert_eq!(b.len(), dims, "Input vector `b` does not match size `dims`");
assert_eq!(
result.len(),
dims,
"Input vector `result` does not match size `dims`"
);
unsafe {
crate::dispatch!(
avx512 = export_cmp_ops::generic_avx512_max_vector,
avx2 = export_cmp_ops::generic_avx2_max_vector,
neon = export_cmp_ops::generic_neon_max_vector,
fallback = export_cmp_ops::generic_fallback_max_vector,
args = (dims, a, b, result)
)
}
}
fn min_horizontal(dims: usize, a: &[Self]) -> Self {
assert_eq!(a.len(), dims, "Input vector `a` does not match size `dims`");
unsafe {
crate::dispatch!(
avx512 = export_cmp_ops::generic_avx512_min_horizontal,
avx2 = export_cmp_ops::generic_avx2_min_horizontal,
neon = export_cmp_ops::generic_neon_min_horizontal,
fallback = export_cmp_ops::generic_fallback_min_horizontal,
args = (dims, a)
)
}
}
fn min_value<B>(dims: usize, value: Self, a: &[Self], result: &mut [B])
where
for<'a> &'a mut [B]: WriteOnlyBuffer<Item = Self>,
{
assert_eq!(a.len(), dims, "Input vector `a` does not match size `dims`");
assert_eq!(
result.len(),
dims,
"Input vector `result` does not match size `dims`"
);
unsafe {
crate::dispatch!(
avx512 = export_cmp_ops::generic_avx512_min_value,
avx2 = export_cmp_ops::generic_avx2_min_value,
neon = export_cmp_ops::generic_neon_min_value,
fallback = export_cmp_ops::generic_fallback_min_value,
args = (dims, value, a, result)
)
}
}
fn min_vector<B>(dims: usize, a: &[Self], b: &[Self], result: &mut [B])
where
for<'a> &'a mut [B]: WriteOnlyBuffer<Item = Self>,
{
assert_eq!(a.len(), dims, "Input vector `a` does not match size `dims`");
assert_eq!(b.len(), dims, "Input vector `b` does not match size `dims`");
assert_eq!(
result.len(),
dims,
"Input vector `result` does not match size `dims`"
);
unsafe {
crate::dispatch!(
avx512 = export_cmp_ops::generic_avx512_min_vector,
avx2 = export_cmp_ops::generic_avx2_min_vector,
neon = export_cmp_ops::generic_neon_min_vector,
fallback = export_cmp_ops::generic_fallback_min_vector,
args = (dims, a, b, result)
)
}
}
}
};
}
cmp_ops!(f32);
cmp_ops!(f64);
cmp_ops!(i8);
cmp_ops!(i16);
cmp_ops!(i32);
cmp_ops!(i64);
cmp_ops!(u8);
cmp_ops!(u16);
cmp_ops!(u32);
cmp_ops!(u64);