Macro core::simd::simd_swizzle
source · pub macro simd_swizzle { ( $vector:expr, $index:expr $(,)? ) => { ... }, ( $first:expr, $second:expr, $index:expr $(,)? ) => { ... }, }
🔬This is a nightly-only experimental API. (
portable_simd
#86656)Expand description
Constructs a new SIMD vector by copying elements from selected elements in other vectors.
When swizzling one vector, elements are selected like Swizzle::swizzle
.
When swizzling two vectors, elements are selected like Swizzle::concat_swizzle
.
§Examples
With a single SIMD vector, the const array specifies element indices in that vector:
let v = u32x4::from_array([10, 11, 12, 13]);
// Keeping the same size
let r: u32x4 = simd_swizzle!(v, [3, 0, 1, 2]);
assert_eq!(r.to_array(), [13, 10, 11, 12]);
// Changing the number of elements
let r: u32x2 = simd_swizzle!(v, [3, 1]);
assert_eq!(r.to_array(), [13, 11]);
RunWith two input SIMD vectors, the const array specifies element indices in the concatenation of those vectors:
let a = u32x4::from_array([0, 1, 2, 3]);
let b = u32x4::from_array([4, 5, 6, 7]);
// Keeping the same size
let r: u32x4 = simd_swizzle!(a, b, [0, 1, 6, 7]);
assert_eq!(r.to_array(), [0, 1, 6, 7]);
// Changing the number of elements
let r: u32x2 = simd_swizzle!(a, b, [0, 4]);
assert_eq!(r.to_array(), [0, 4]);
Run