core::simd::num

Trait SimdInt

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pub trait SimdInt: Copy + Sealed {
    type Mask;
    type Scalar;
    type Unsigned;
    type Cast<T: SimdElement>;


Show 22 methods    // Required methods
    fn cast<T: SimdCast>(self) -> Self::Cast<T>;
    fn saturating_add(self, second: Self) -> Self;
    fn saturating_sub(self, second: Self) -> Self;
    fn abs(self) -> Self;
    fn saturating_abs(self) -> Self;
    fn saturating_neg(self) -> Self;
    fn is_positive(self) -> Self::Mask;
    fn is_negative(self) -> Self::Mask;
    fn signum(self) -> Self;
    fn reduce_sum(self) -> Self::Scalar;
    fn reduce_product(self) -> Self::Scalar;
    fn reduce_max(self) -> Self::Scalar;
    fn reduce_min(self) -> Self::Scalar;
    fn reduce_and(self) -> Self::Scalar;
    fn reduce_or(self) -> Self::Scalar;
    fn reduce_xor(self) -> Self::Scalar;
    fn swap_bytes(self) -> Self;
    fn reverse_bits(self) -> Self;
    fn leading_zeros(self) -> Self::Unsigned;
    fn trailing_zeros(self) -> Self::Unsigned;
    fn leading_ones(self) -> Self::Unsigned;
    fn trailing_ones(self) -> Self::Unsigned;

}
🔬This is a nightly-only experimental API. (portable_simd #86656)
Expand description

Operations on SIMD vectors of signed integers.

Required Associated Types§

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type Mask

🔬This is a nightly-only experimental API. (portable_simd #86656)

Mask type used for manipulating this SIMD vector type.

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type Scalar

🔬This is a nightly-only experimental API. (portable_simd #86656)

Scalar type contained by this SIMD vector type.

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type Unsigned

🔬This is a nightly-only experimental API. (portable_simd #86656)

A SIMD vector of unsigned integers with the same element size.

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type Cast<T: SimdElement>

🔬This is a nightly-only experimental API. (portable_simd #86656)

A SIMD vector with a different element type.

Required Methods§

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fn cast<T: SimdCast>(self) -> Self::Cast<T>

🔬This is a nightly-only experimental API. (portable_simd #86656)

Performs elementwise conversion of this vector’s elements to another SIMD-valid type.

This follows the semantics of Rust’s as conversion for casting integers (wrapping to other integer types, and saturating to float types).

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fn saturating_add(self, second: Self) -> Self

🔬This is a nightly-only experimental API. (portable_simd #86656)

Lanewise saturating add.

§Examples
use core::i32::{MIN, MAX};
let x = Simd::from_array([MIN, 0, 1, MAX]);
let max = Simd::splat(MAX);
let unsat = x + max;
let sat = x.saturating_add(max);
assert_eq!(unsat, Simd::from_array([-1, MAX, MIN, -2]));
assert_eq!(sat, Simd::from_array([-1, MAX, MAX, MAX]));
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fn saturating_sub(self, second: Self) -> Self

🔬This is a nightly-only experimental API. (portable_simd #86656)

Lanewise saturating subtract.

§Examples
use core::i32::{MIN, MAX};
let x = Simd::from_array([MIN, -2, -1, MAX]);
let max = Simd::splat(MAX);
let unsat = x - max;
let sat = x.saturating_sub(max);
assert_eq!(unsat, Simd::from_array([1, MAX, MIN, 0]));
assert_eq!(sat, Simd::from_array([MIN, MIN, MIN, 0]));
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fn abs(self) -> Self

🔬This is a nightly-only experimental API. (portable_simd #86656)

Lanewise absolute value, implemented in Rust. Every element becomes its absolute value.

§Examples
use core::i32::{MIN, MAX};
let xs = Simd::from_array([MIN, MIN +1, -5, 0]);
assert_eq!(xs.abs(), Simd::from_array([MIN, MAX, 5, 0]));
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fn saturating_abs(self) -> Self

🔬This is a nightly-only experimental API. (portable_simd #86656)

Lanewise saturating absolute value, implemented in Rust. As abs(), except the MIN value becomes MAX instead of itself.

§Examples
use core::i32::{MIN, MAX};
let xs = Simd::from_array([MIN, -2, 0, 3]);
let unsat = xs.abs();
let sat = xs.saturating_abs();
assert_eq!(unsat, Simd::from_array([MIN, 2, 0, 3]));
assert_eq!(sat, Simd::from_array([MAX, 2, 0, 3]));
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fn saturating_neg(self) -> Self

🔬This is a nightly-only experimental API. (portable_simd #86656)

Lanewise saturating negation, implemented in Rust. As neg(), except the MIN value becomes MAX instead of itself.

§Examples
use core::i32::{MIN, MAX};
let x = Simd::from_array([MIN, -2, 3, MAX]);
let unsat = -x;
let sat = x.saturating_neg();
assert_eq!(unsat, Simd::from_array([MIN, 2, -3, MIN + 1]));
assert_eq!(sat, Simd::from_array([MAX, 2, -3, MIN + 1]));
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fn is_positive(self) -> Self::Mask

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns true for each positive element and false if it is zero or negative.

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fn is_negative(self) -> Self::Mask

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns true for each negative element and false if it is zero or positive.

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fn signum(self) -> Self

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns numbers representing the sign of each element.

  • 0 if the number is zero
  • 1 if the number is positive
  • -1 if the number is negative
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fn reduce_sum(self) -> Self::Scalar

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the sum of the elements of the vector, with wrapping addition.

§Examples
let v = i32x4::from_array([1, 2, 3, 4]);
assert_eq!(v.reduce_sum(), 10);

// SIMD integer addition is always wrapping
let v = i32x4::from_array([i32::MAX, 1, 0, 0]);
assert_eq!(v.reduce_sum(), i32::MIN);
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fn reduce_product(self) -> Self::Scalar

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the product of the elements of the vector, with wrapping multiplication.

§Examples
let v = i32x4::from_array([1, 2, 3, 4]);
assert_eq!(v.reduce_product(), 24);

// SIMD integer multiplication is always wrapping
let v = i32x4::from_array([i32::MAX, 2, 1, 1]);
assert!(v.reduce_product() < i32::MAX);
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fn reduce_max(self) -> Self::Scalar

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the maximum element in the vector.

§Examples
let v = i32x4::from_array([1, 2, 3, 4]);
assert_eq!(v.reduce_max(), 4);
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fn reduce_min(self) -> Self::Scalar

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the minimum element in the vector.

§Examples
let v = i32x4::from_array([1, 2, 3, 4]);
assert_eq!(v.reduce_min(), 1);
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fn reduce_and(self) -> Self::Scalar

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the cumulative bitwise “and” across the elements of the vector.

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fn reduce_or(self) -> Self::Scalar

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the cumulative bitwise “or” across the elements of the vector.

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fn reduce_xor(self) -> Self::Scalar

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the cumulative bitwise “xor” across the elements of the vector.

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fn swap_bytes(self) -> Self

🔬This is a nightly-only experimental API. (portable_simd #86656)

Reverses the byte order of each element.

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fn reverse_bits(self) -> Self

🔬This is a nightly-only experimental API. (portable_simd #86656)

Reverses the order of bits in each elemnent. The least significant bit becomes the most significant bit, second least-significant bit becomes second most-significant bit, etc.

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fn leading_zeros(self) -> Self::Unsigned

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the number of leading zeros in the binary representation of each element.

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fn trailing_zeros(self) -> Self::Unsigned

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the number of trailing zeros in the binary representation of each element.

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fn leading_ones(self) -> Self::Unsigned

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the number of leading ones in the binary representation of each element.

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fn trailing_ones(self) -> Self::Unsigned

🔬This is a nightly-only experimental API. (portable_simd #86656)

Returns the number of trailing ones in the binary representation of each element.

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§