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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 vecs::*;

pub trait PackedCmp {
    /// Return a vector where each element at an index i is the maximum of the
    /// elements at index i in `self` and `other`.
    ///
    /// ```
    /// extern crate faster;
    /// use faster::*;
    ///
    /// # fn main() {
    /// assert_eq!(i8s(0).max(i8s(2)), i8s(2));
    /// assert_eq!(i8s::halfs(1, 0).max(i8s::halfs(2, -1)), i8s::halfs(2, 0));
    /// # }
    /// ```
    fn max(&self, other: Self) -> Self;

    /// Return a vector where each element at an index i is the minimum of the
    /// elements at index i in `self` and `other`.
    ///
    /// ```
    /// extern crate faster;
    /// use faster::*;
    ///
    /// # fn main() {
    /// assert_eq!(i8s(0).min(i8s(2)), i8s(0));
    /// assert_eq!(i8s::halfs(1, 0).min(i8s::halfs(2, -1)), i8s::halfs(1, -1));
    /// # }
    /// ```
    fn min(&self, other: Self) -> Self;
}

rust_fallback_impl_binary! {
    impl PackedCmp for u8x16 where "sse2" {
        min => _mm_min_epu8(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
        max => _mm_max_epu8(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for i8x16 where "sse4.1" {
        min => _mm_min_epi8(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
        max => _mm_max_epi8(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for u16x8 where "sse4.1" {
        min => _mm_min_epu16(), [0, 1, 2, 3, 4, 5, 6, 7];
        max => _mm_max_epu16(), [0, 1, 2, 3, 4, 5, 6, 7];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for i16x8 where "sse4.1" {
        min => _mm_min_epi16(), [0, 1, 2, 3, 4, 5, 6, 7];
        max => _mm_max_epi16(), [0, 1, 2, 3, 4, 5, 6, 7];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for u32x4 where "sse4.1" {
        min => _mm_min_epu32(), [0, 1, 2, 3];
        max => _mm_max_epu32(), [0, 1, 2, 3];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for i32x4 where "sse4.1" {
        min => _mm_min_epi32(), [0, 1, 2, 3];
        max => _mm_max_epi32(), [0, 1, 2, 3];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for f32x4 where "sse" {
        min => _mm_min_ps(), [0, 1, 2, 3];
        max => _mm_max_ps(), [0, 1, 2, 3];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for f64x2 where "sse2" {
        min => _mm_min_pd(), [0, 1];
        max => _mm_max_pd(), [0, 1];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for u8x32 where "avx2" {
        min => _mm256_min_epu8(), [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];
        max => _mm256_max_epu8(), [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];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for i8x32 where "avx2" {
        min => _mm256_min_epi8(), [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];
        max => _mm256_max_epi8(), [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];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for u16x16 where "avx2" {
        min => _mm256_min_epu16(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
        max => _mm256_max_epu16(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
    }
}


rust_fallback_impl_binary! {
    impl PackedCmp for i16x16 where "avx2" {
        min => _mm256_min_epi16(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
        max => _mm256_max_epi16(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for u32x8 where "avx" {
        min => _mm256_min_epu32(), [0, 1, 2, 3, 4, 5, 6, 7];
        max => _mm256_max_epu32(), [0, 1, 2, 3, 4, 5, 6, 7];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for i32x8 where "avx" {
        min => _mm256_min_epi32(), [0, 1, 2, 3, 4, 5, 6, 7];
        max => _mm256_max_epi32(), [0, 1, 2, 3, 4, 5, 6, 7];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for f32x8 where "avx" {
        min => _mm256_min_ps(), [0, 1, 2, 3, 4, 5, 6, 7];
        max => _mm256_max_ps(), [0, 1, 2, 3, 4, 5, 6, 7];
    }
}

rust_fallback_impl_binary! {
    impl PackedCmp for f64x4 where "avx" {
        min => _mm256_min_pd(), [0, 1, 2, 3];
        max => _mm256_max_pd(), [0, 1, 2, 3];
    }
}