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//! Implements portable vector shuffles with immediate indices. // FIXME: comprehensive tests // https://github.com/rust-lang-nursery/packed_simd/issues/20 /// Shuffles vector elements. /// /// This macro returns a new vector that contains a shuffle of the elements in /// one (`shuffle!(vec, [indices...])`) or two (`shuffle!(vec0, vec1, /// [indices...])`) input vectors. /// /// The type of `vec0` and `vec1` must be equal, and the element type of the /// resulting vector is the element type of the input vector. /// /// The number of `indices` must be a power-of-two in range `[0, 64)`, since /// currently, the largest vector supported by the library has 64 lanes. The /// length of the resulting vector equals the number of indices provided. /// /// The indices must be in range `[0, M * N)` where `M` is the number of input /// vectors (`1` or `2`) and `N` is the number of lanes of the input vectors. /// The indices `i` in range `[0, N)` refer to the `i`-th element of `vec0`, /// while the indices in range `[N, 2*N)` refer to the `i - N`-th element of /// `vec1`. /// /// # Examples /// /// Shuffling elements of two vectors: /// /// ``` /// # #[macro_use] /// # extern crate packed_simd; /// # use packed_simd::*; /// # fn main() { /// // Shuffle allows reordering the elements: /// let x = i32x4::new(1, 2, 3, 4); /// let y = i32x4::new(5, 6, 7, 8); /// let r = shuffle!(x, y, [4, 0, 5, 1]); /// assert_eq!(r, i32x4::new(5, 1, 6, 2)); /// /// // The resulting vector can als be smaller than the input: /// let r = shuffle!(x, y, [1, 6]); /// assert_eq!(r, i32x2::new(2, 7)); /// /// // Or larger: /// let r = shuffle!(x, y, [1, 3, 4, 2, 1, 7, 2, 2]); /// assert_eq!(r, i32x8::new(2, 4, 5, 3, 2, 8, 3, 3)); /// // At most 2 * the number of lanes in the input vector. /// # } /// ``` /// /// Shuffling elements of one vector: /// /// ``` /// # #[macro_use] /// # extern crate packed_simd; /// # use packed_simd::*; /// # fn main() { /// // Shuffle allows reordering the elements of a vector: /// let x = i32x4::new(1, 2, 3, 4); /// let r = shuffle!(x, [2, 1, 3, 0]); /// assert_eq!(r, i32x4::new(3, 2, 4, 1)); /// /// // The resulting vector can be smaller than the input: /// let r = shuffle!(x, [1, 3]); /// assert_eq!(r, i32x2::new(2, 4)); /// /// // Equal: /// let r = shuffle!(x, [1, 3, 2, 0]); /// assert_eq!(r, i32x4::new(2, 4, 3, 1)); /// /// // Or larger: /// let r = shuffle!(x, [1, 3, 2, 2, 1, 3, 2, 2]); /// assert_eq!(r, i32x8::new(2, 4, 3, 3, 2, 4, 3, 3)); /// // At most 2 * the number of lanes in the input vector. /// # } /// ``` #[macro_export] macro_rules! shuffle { ($vec0:expr, $vec1:expr, [$l0:expr, $l1:expr]) => {{ #[allow(unused_unsafe)] unsafe { $crate::Simd($crate::__shuffle_vector2( $vec0.0, $vec1.0, [$l0, $l1], )) } }}; ($vec0:expr, $vec1:expr, [$l0:expr, $l1:expr, $l2:expr, $l3:expr]) => {{ #[allow(unused_unsafe)] unsafe { $crate::Simd($crate::__shuffle_vector4( $vec0.0, $vec1.0, [$l0, $l1, $l2, $l3], )) } }}; ($vec0:expr, $vec1:expr, [$l0:expr, $l1:expr, $l2:expr, $l3:expr, $l4:expr, $l5:expr, $l6:expr, $l7:expr]) => {{ #[allow(unused_unsafe)] unsafe { $crate::Simd($crate::__shuffle_vector8( $vec0.0, $vec1.0, [$l0, $l1, $l2, $l3, $l4, $l5, $l6, $l7], )) } }}; ($vec0:expr, $vec1:expr, [$l0:expr, $l1:expr, $l2:expr, $l3:expr, $l4:expr, $l5:expr, $l6:expr, $l7:expr, $l8:expr, $l9:expr, $l10:expr, $l11:expr, $l12:expr, $l13:expr, $l14:expr, $l15:expr]) => {{ #[allow(unused_unsafe)] unsafe { $crate::Simd($crate::__shuffle_vector16( $vec0.0, $vec1.0, [ $l0, $l1, $l2, $l3, $l4, $l5, $l6, $l7, $l8, $l9, $l10, $l11, $l12, $l13, $l14, $l15, ], )) } }}; ($vec0:expr, $vec1:expr, [$l0:expr, $l1:expr, $l2:expr, $l3:expr, $l4:expr, $l5:expr, $l6:expr, $l7:expr, $l8:expr, $l9:expr, $l10:expr, $l11:expr, $l12:expr, $l13:expr, $l14:expr, $l15:expr, $l16:expr, $l17:expr, $l18:expr, $l19:expr, $l20:expr, $l21:expr, $l22:expr, $l23:expr, $l24:expr, $l25:expr, $l26:expr, $l27:expr, $l28:expr, $l29:expr, $l30:expr, $l31:expr]) => {{ #[allow(unused_unsafe)] unsafe { $crate::Simd($crate::__shuffle_vector32( $vec0.0, $vec1.0, [ $l0, $l1, $l2, $l3, $l4, $l5, $l6, $l7, $l8, $l9, $l10, $l11, $l12, $l13, $l14, $l15, $l16, $l17, $l18, $l19, $l20, $l21, $l22, $l23, $l24, $l25, $l26, $l27, $l28, $l29, $l30, $l31, ], )) } }}; ($vec0:expr, $vec1:expr, [$l0:expr, $l1:expr, $l2:expr, $l3:expr, $l4:expr, $l5:expr, $l6:expr, $l7:expr, $l8:expr, $l9:expr, $l10:expr, $l11:expr, $l12:expr, $l13:expr, $l14:expr, $l15:expr, $l16:expr, $l17:expr, $l18:expr, $l19:expr, $l20:expr, $l21:expr, $l22:expr, $l23:expr, $l24:expr, $l25:expr, $l26:expr, $l27:expr, $l28:expr, $l29:expr, $l30:expr, $l31:expr, $l32:expr, $l33:expr, $l34:expr, $l35:expr, $l36:expr, $l37:expr, $l38:expr, $l39:expr, $l40:expr, $l41:expr, $l42:expr, $l43:expr, $l44:expr, $l45:expr, $l46:expr, $l47:expr, $l48:expr, $l49:expr, $l50:expr, $l51:expr, $l52:expr, $l53:expr, $l54:expr, $l55:expr, $l56:expr, $l57:expr, $l58:expr, $l59:expr, $l60:expr, $l61:expr, $l62:expr, $l63:expr]) => {{ #[allow(unused_unsafe)] unsafe { $crate::Simd($crate::__shuffle_vector64( $vec0.0, $vec1.0, [ $l0, $l1, $l2, $l3, $l4, $l5, $l6, $l7, $l8, $l9, $l10, $l11, $l12, $l13, $l14, $l15, $l16, $l17, $l18, $l19, $l20, $l21, $l22, $l23, $l24, $l25, $l26, $l27, $l28, $l29, $l30, $l31, $l32, $l33, $l34, $l35, $l36, $l37, $l38, $l39, $l40, $l41, $l42, $l43, $l44, $l45, $l46, $l47, $l48, $l49, $l50, $l51, $l52, $l53, $l54, $l55, $l56, $l57, $l58, $l59, $l60, $l61, $l62, $l63, ], )) } }}; ($vec:expr, [$($l:expr),*]) => { match $vec { v => shuffle!(v, v, [$($l),*]) } }; }