| //! Horizontal swap bytes |
| |
| macro_rules! impl_swap_bytes { |
| ([$elem_ty:ident; $elem_count:expr]: $id:ident | $test_tt:tt) => { |
| impl $id { |
| /// Reverses the byte order of the vector. |
| #[inline] |
| pub fn swap_bytes(self) -> Self { |
| super::codegen::swap_bytes::SwapBytes::swap_bytes(self) |
| } |
| |
| /// Converts self to little endian from the target's endianness. |
| /// |
| /// On little endian this is a no-op. On big endian the bytes are |
| /// swapped. |
| #[inline] |
| pub fn to_le(self) -> Self { |
| #[cfg(target_endian = "little")] |
| { |
| self |
| } |
| #[cfg(not(target_endian = "little"))] |
| { |
| self.swap_bytes() |
| } |
| } |
| |
| /// Converts self to big endian from the target's endianness. |
| /// |
| /// On big endian this is a no-op. On little endian the bytes are |
| /// swapped. |
| #[inline] |
| pub fn to_be(self) -> Self { |
| #[cfg(target_endian = "big")] |
| { |
| self |
| } |
| #[cfg(not(target_endian = "big"))] |
| { |
| self.swap_bytes() |
| } |
| } |
| |
| /// Converts a vector from little endian to the target's endianness. |
| /// |
| /// On little endian this is a no-op. On big endian the bytes are |
| /// swapped. |
| #[inline] |
| pub fn from_le(x: Self) -> Self { |
| #[cfg(target_endian = "little")] |
| { |
| x |
| } |
| #[cfg(not(target_endian = "little"))] |
| { |
| x.swap_bytes() |
| } |
| } |
| |
| /// Converts a vector from big endian to the target's endianness. |
| /// |
| /// On big endian this is a no-op. On little endian the bytes are |
| /// swapped. |
| #[inline] |
| pub fn from_be(x: Self) -> Self { |
| #[cfg(target_endian = "big")] |
| { |
| x |
| } |
| #[cfg(not(target_endian = "big"))] |
| { |
| x.swap_bytes() |
| } |
| } |
| } |
| |
| test_if! { |
| $test_tt: |
| paste::item! { |
| pub mod [<$id _swap_bytes>] { |
| use super::*; |
| |
| const BYTES: [u8; 64] = [ |
| 0, 1, 2, 3, 4, 5, 6, 7, |
| 8, 9, 10, 11, 12, 13, 14, 15, |
| 16, 17, 18, 19, 20, 21, 22, 23, |
| 24, 25, 26, 27, 28, 29, 30, 31, |
| 32, 33, 34, 35, 36, 37, 38, 39, |
| 40, 41, 42, 43, 44, 45, 46, 47, |
| 48, 49, 50, 51, 52, 53, 54, 55, |
| 56, 57, 58, 59, 60, 61, 62, 63, |
| ]; |
| |
| macro_rules! swap { |
| ($func: ident) => {{ |
| // catch possible future >512 vectors |
| assert!(mem::size_of::<$id>() <= 64); |
| |
| let mut actual = BYTES; |
| let elems: &mut [$elem_ty] = unsafe { |
| slice::from_raw_parts_mut( |
| actual.as_mut_ptr() as *mut $elem_ty, |
| $id::lanes(), |
| ) |
| }; |
| |
| let vec = $id::from_slice_unaligned(elems); |
| $id::$func(vec).write_to_slice_unaligned(elems); |
| |
| actual |
| }}; |
| } |
| |
| macro_rules! test_swap { |
| ($func: ident) => {{ |
| let actual = swap!($func); |
| let expected = |
| BYTES.iter().rev() |
| .skip(64 - crate::mem::size_of::<$id>()); |
| assert!(actual.iter().zip(expected) |
| .all(|(x, y)| x == y)); |
| }}; |
| } |
| |
| macro_rules! test_no_swap { |
| ($func: ident) => {{ |
| let actual = swap!($func); |
| let expected = BYTES.iter() |
| .take(mem::size_of::<$id>()); |
| |
| assert!(actual.iter().zip(expected) |
| .all(|(x, y)| x == y)); |
| }}; |
| } |
| |
| #[cfg_attr(not(target_arch = "wasm32"), test)] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] |
| fn swap_bytes() { |
| test_swap!(swap_bytes); |
| } |
| |
| #[cfg_attr(not(target_arch = "wasm32"), test)] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] |
| fn to_le() { |
| #[cfg(target_endian = "little")] |
| { |
| test_no_swap!(to_le); |
| } |
| #[cfg(not(target_endian = "little"))] |
| { |
| test_swap!(to_le); |
| } |
| } |
| |
| #[cfg_attr(not(target_arch = "wasm32"), test)] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] |
| fn to_be() { |
| #[cfg(target_endian = "big")] |
| { |
| test_no_swap!(to_be); |
| } |
| #[cfg(not(target_endian = "big"))] |
| { |
| test_swap!(to_be); |
| } |
| } |
| |
| #[cfg_attr(not(target_arch = "wasm32"), test)] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] |
| fn from_le() { |
| #[cfg(target_endian = "little")] |
| { |
| test_no_swap!(from_le); |
| } |
| #[cfg(not(target_endian = "little"))] |
| { |
| test_swap!(from_le); |
| } |
| } |
| |
| #[cfg_attr(not(target_arch = "wasm32"), test)] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] |
| fn from_be() { |
| #[cfg(target_endian = "big")] |
| { |
| test_no_swap!(from_be); |
| } |
| #[cfg(not(target_endian = "big"))] |
| { |
| test_swap!(from_be); |
| } |
| } |
| } |
| } |
| } |
| }; |
| } |