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```//! Implements portable arithmetic vector reductions.
#![allow(unused)]

macro_rules! impl_arithmetic_reductions {
(\$id:ident, \$elem_ty:ident) => {
impl \$id {
/// Horizontal 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))
///
/// # Integer vectors
///
/// If an operation overflows it returns the mathematical result
/// modulo `2^n` where `n` is the number of times it overflows.
///
/// # Floating-point vectors
///
/// If one of the vector element is `NaN` the reduction returns
/// `NaN`.
#[cfg(not(target_arch = "aarch64"))]
#[inline]
pub fn wrapping_sum(self) -> \$elem_ty {
unsafe { simd_reduce_add_ordered(self, 0 as \$elem_ty) }
}
/// Horizontal 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))
///
/// # Integer vectors
///
/// If an operation overflows it returns the mathematical result
/// modulo `2^n` where `n` is the number of times it overflows.
///
/// # Floating-point vectors
///
/// If one of the vector element is `NaN` the reduction returns
/// `NaN`.
#[cfg(target_arch = "aarch64")]
#[inline]
pub fn wrapping_sum(self) -> \$elem_ty {
// FIXME: broken on AArch64
// https://bugs.llvm.org/show_bug.cgi?id=36796
use super::codegen::wrapping::Wrapping;
let mut x = self.extract(0) as \$elem_ty;
for i in 1..\$id::lanes() {
x = Wrapping::add(x, self.extract(i) as \$elem_ty);
}
x
}

/// Horizontal 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))
///
/// # Integer vectors
///
/// If an operation overflows it returns the mathematical result
/// modulo `2^n` where `n` is the number of times it overflows.
///
/// # Floating-point vectors
///
/// If one of the vector element is `NaN` the reduction returns
/// `NaN`.
#[cfg(not(target_arch = "aarch64"))]
#[inline]
pub fn wrapping_product(self) -> \$elem_ty {
use coresimd::simd_llvm::simd_reduce_mul_ordered;
unsafe { simd_reduce_mul_ordered(self, 1 as \$elem_ty) }
}
/// Horizontal 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))
///
/// # Integer vectors
///
/// If an operation overflows it returns the mathematical result
/// modulo `2^n` where `n` is the number of times it overflows.
///
/// # Floating-point vectors
///
/// If one of the vector element is `NaN` the reduction returns
/// `NaN`.
#[cfg(target_arch = "aarch64")]
#[inline]
pub fn wrapping_product(self) -> \$elem_ty {
// FIXME: broken on AArch64
// https://bugs.llvm.org/show_bug.cgi?id=36796
use super::codegen::wrapping::Wrapping;
let mut x = self.extract(0) as \$elem_ty;
for i in 1..\$id::lanes() {
x = Wrapping::mul(x, self.extract(i) as \$elem_ty);
}
x
}
}
};
}

#[cfg(test)]
macro_rules! test_arithmetic_reductions {
(\$id:ident, \$elem_ty:ident) => {
fn alternating(x: usize) -> ::coresimd::simd::\$id {
use coresimd::simd::\$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
}

#[test]
fn wrapping_sum() {
use coresimd::simd::\$id;
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);
assert_eq!(
v.wrapping_sum(),
(\$id::lanes() / 2 + \$id::lanes()) as \$elem_ty
);
}
#[test]
fn wrapping_product() {
use coresimd::simd::\$id;
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);
assert_eq!(
v.wrapping_product(),
(2_usize.pow((\$id::lanes() / f) as u32) as \$elem_ty)
);
}
};
}
```