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Diffstat (limited to 'third_party/rust/packed_simd/src/api/reductions/integer_arithmetic.rs')
| -rw-r--r-- | third_party/rust/packed_simd/src/api/reductions/integer_arithmetic.rs | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/third_party/rust/packed_simd/src/api/reductions/integer_arithmetic.rs b/third_party/rust/packed_simd/src/api/reductions/integer_arithmetic.rs deleted file mode 100644 index e99e6cb5d7..0000000000 --- a/third_party/rust/packed_simd/src/api/reductions/integer_arithmetic.rs +++ /dev/null @@ -1,193 +0,0 @@ -//! Implements portable horizontal integer vector arithmetic reductions. - -macro_rules! impl_reduction_integer_arithmetic { - ([$elem_ty:ident; $elem_count:expr]: $id:ident | $ielem_ty:ident - | $test_tt:tt) => { - impl $id { - /// Horizontal wrapping sum of the vector elements. - /// - /// The intrinsic performs a tree-reduction of the vector elements. - /// That is, for an 8 element vector: - /// - /// > ((x0 + x1) + (x2 + x3)) + ((x4 + x5) + (x6 + x7)) - /// - /// If an operation overflows it returns the mathematical result - /// modulo `2^n` where `n` is the number of times it overflows. - #[inline] - pub fn wrapping_sum(self) -> $elem_ty { - #[cfg(not(target_arch = "aarch64"))] - { - use crate::llvm::simd_reduce_add_ordered; - let v: $ielem_ty = unsafe { simd_reduce_add_ordered(self.0, 0 as $ielem_ty) }; - v as $elem_ty - } - #[cfg(target_arch = "aarch64")] - { - // FIXME: broken on AArch64 - // https://github.com/rust-lang-nursery/packed_simd/issues/15 - let mut x = self.extract(0) as $elem_ty; - for i in 1..$id::lanes() { - x = x.wrapping_add(self.extract(i) as $elem_ty); - } - x - } - } - - /// Horizontal wrapping product of the vector elements. - /// - /// The intrinsic performs a tree-reduction of the vector elements. - /// That is, for an 8 element vector: - /// - /// > ((x0 * x1) * (x2 * x3)) * ((x4 * x5) * (x6 * x7)) - /// - /// If an operation overflows it returns the mathematical result - /// modulo `2^n` where `n` is the number of times it overflows. - #[inline] - pub fn wrapping_product(self) -> $elem_ty { - #[cfg(not(target_arch = "aarch64"))] - { - use crate::llvm::simd_reduce_mul_ordered; - let v: $ielem_ty = unsafe { simd_reduce_mul_ordered(self.0, 1 as $ielem_ty) }; - v as $elem_ty - } - #[cfg(target_arch = "aarch64")] - { - // FIXME: broken on AArch64 - // https://github.com/rust-lang-nursery/packed_simd/issues/15 - let mut x = self.extract(0) as $elem_ty; - for i in 1..$id::lanes() { - x = x.wrapping_mul(self.extract(i) as $elem_ty); - } - x - } - } - } - - impl crate::iter::Sum for $id { - #[inline] - fn sum<I: Iterator<Item = $id>>(iter: I) -> $id { - iter.fold($id::splat(0), crate::ops::Add::add) - } - } - - impl crate::iter::Product for $id { - #[inline] - fn product<I: Iterator<Item = $id>>(iter: I) -> $id { - iter.fold($id::splat(1), crate::ops::Mul::mul) - } - } - - impl<'a> crate::iter::Sum<&'a $id> for $id { - #[inline] - fn sum<I: Iterator<Item = &'a $id>>(iter: I) -> $id { - iter.fold($id::splat(0), |a, b| crate::ops::Add::add(a, *b)) - } - } - - impl<'a> crate::iter::Product<&'a $id> for $id { - #[inline] - fn product<I: Iterator<Item = &'a $id>>(iter: I) -> $id { - iter.fold($id::splat(1), |a, b| crate::ops::Mul::mul(a, *b)) - } - } - - test_if! { - $test_tt: - paste::item! { - pub mod [<$id _reduction_int_arith>] { - use super::*; - - fn alternating(x: usize) -> $id { - let mut v = $id::splat(1 as $elem_ty); - for i in 0..$id::lanes() { - if i % x == 0 { - v = v.replace(i, 2 as $elem_ty); - } - } - v - } - - #[cfg_attr(not(target_arch = "wasm32"), test)] - #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] - fn wrapping_sum() { - let v = $id::splat(0 as $elem_ty); - assert_eq!(v.wrapping_sum(), 0 as $elem_ty); - let v = $id::splat(1 as $elem_ty); - assert_eq!(v.wrapping_sum(), $id::lanes() as $elem_ty); - let v = alternating(2); - if $id::lanes() > 1 { - assert_eq!( - v.wrapping_sum(), - ($id::lanes() / 2 + $id::lanes()) as $elem_ty - ); - } else { - assert_eq!( - v.wrapping_sum(), - 2 as $elem_ty - ); - } - } - #[cfg_attr(not(target_arch = "wasm32"), test)] - #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] - fn wrapping_sum_overflow() { - let start = $elem_ty::max_value() - - ($id::lanes() as $elem_ty / 2); - - let v = $id::splat(start as $elem_ty); - let vwrapping_sum = v.wrapping_sum(); - - let mut wrapping_sum = start; - for _ in 1..$id::lanes() { - wrapping_sum = wrapping_sum.wrapping_add(start); - } - assert_eq!(wrapping_sum, vwrapping_sum, "v = {:?}", v); - } - - #[cfg_attr(not(target_arch = "wasm32"), test)] - #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] - fn wrapping_product() { - let v = $id::splat(0 as $elem_ty); - assert_eq!(v.wrapping_product(), 0 as $elem_ty); - let v = $id::splat(1 as $elem_ty); - assert_eq!(v.wrapping_product(), 1 as $elem_ty); - let f = match $id::lanes() { - 64 => 16, - 32 => 8, - 16 => 4, - _ => 2, - }; - let v = alternating(f); - if $id::lanes() > 1 { - assert_eq!( - v.wrapping_product(), - (2_usize.pow(($id::lanes() / f) as u32) - as $elem_ty) - ); - } else { - assert_eq!( - v.wrapping_product(), - 2 as $elem_ty - ); - } - } - - #[cfg_attr(not(target_arch = "wasm32"), test)] - #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] - fn wrapping_product_overflow() { - let start = $elem_ty::max_value() - - ($id::lanes() as $elem_ty / 2); - - let v = $id::splat(start as $elem_ty); - let vmul = v.wrapping_product(); - - let mut mul = start; - for _ in 1..$id::lanes() { - mul = mul.wrapping_mul(start); - } - assert_eq!(mul, vmul, "v = {:?}", v); - } - } - } - } - }; -} |