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// This file is part of faster, the SIMD library for humans.
// Copyright 2017 Adam Niederer <adam.niederer@gmail.com>

// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

use stdsimd::vendor::*;
use stdsimd::simd::*;

pub trait PackedSaturatingHsub {
    fn saturating_hsub(&self, other: Self) -> Self;
}

impl PackedSaturatingHsub for i16x8 {
    #[inline(always)]
    #[cfg(target_feature = "ssse3")]
    fn saturating_hsub(&self, other: Self) -> Self {
        unsafe { _mm_hsubs_epi16(*self, other) }
    }

    #[inline(always)]
    #[cfg(not(target_feature = "ssse3"))]
    fn saturating_hsub(&self, other: Self) -> Self {
        Self::new(self.extract(0).saturating_sub(self.extract(1)),
                  self.extract(2).saturating_sub(self.extract(3)),
                  self.extract(4).saturating_sub(self.extract(5)),
                  self.extract(6).saturating_sub(self.extract(7)),
                  other.extract(0).saturating_sub(other.extract(1)),
                  other.extract(2).saturating_sub(other.extract(3)),
                  other.extract(4).saturating_sub(other.extract(5)),
                  other.extract(6).saturating_sub(other.extract(7)))
    }
}

impl PackedSaturatingHsub for i16x16 {
    #[inline(always)]
    #[cfg(target_feature = "avx2")]
    fn saturating_hsub(&self, other: Self) -> Self {
        unsafe { _mm256_hsubs_epi16(*self, other) }
    }

    #[inline(always)]
    #[cfg(not(target_feature = "avx2"))]
    fn saturating_hsub(&self, other: Self) -> Self {
        Self::new(self.extract(0).saturating_sub(self.extract(1)),
                  self.extract(2).saturating_sub(self.extract(3)),
                  self.extract(4).saturating_sub(self.extract(5)),
                  self.extract(6).saturating_sub(self.extract(7)),
                  other.extract(0).saturating_sub(other.extract(1)),
                  other.extract(2).saturating_sub(other.extract(3)),
                  other.extract(4).saturating_sub(other.extract(5)),
                  other.extract(6).saturating_sub(other.extract(7)),
                  self.extract(8).saturating_sub(self.extract(9)),
                  self.extract(10).saturating_sub(self.extract(11)),
                  self.extract(12).saturating_sub(self.extract(13)),
                  self.extract(14).saturating_sub(self.extract(15)),
                  other.extract(8).saturating_sub(other.extract(9)),
                  other.extract(10).saturating_sub(other.extract(11)),
                  other.extract(12).saturating_sub(other.extract(13)),
                  other.extract(14).saturating_sub(other.extract(15)))
    }
}