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//! `x86_64` 流式 SIMD 扩展 (SSE)

use crate::core_arch::x86::*;

#[cfg(test)]
use stdarch_test::assert_instr;

#[allow(improper_ctypes)]
extern "C" {
    #[link_name = "llvm.x86.sse.cvtss2si64"]
    fn cvtss2si64(a: __m128) -> i64;
    #[link_name = "llvm.x86.sse.cvttss2si64"]
    fn cvttss2si64(a: __m128) -> i64;
    #[link_name = "llvm.x86.sse.cvtsi642ss"]
    fn cvtsi642ss(a: __m128, b: i64) -> __m128;
}

/// 将输入 vector 中的最低 32 位浮点型转换为 64 位整数。
///
/// 根据当前舍入模式对结果进行舍入。
/// 如果结果不能表示为 64 位整数，则结果将为 `0x8000_0000_0000_0000` (`i64::MIN`) 或在未屏蔽的情况下触发无效的操作浮点异常 (请参见 [`_mm_setcsr`](fn._mm_setcsr.html))。)
///
///
/// 这对应于 `CVTSS2SI` 指令 (具有 64 位输出)。
///
/// [Intel's documentation](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_cvtss_si64)
///
///
#[inline]
#[target_feature(enable = "sse")]
#[cfg_attr(test, assert_instr(cvtss2si))]
#[stable(feature = "simd_x86", since = "1.27.0")]
pub unsafe fn _mm_cvtss_si64(a: __m128) -> i64 {
    cvtss2si64(a)
}

/// 将输入 vector 中的最低 32 位浮点型转换为带截断的 64 位整数。
///
/// 始终使用截断将结果四舍五入 (趋向于零)。
/// 如果结果不能表示为 64 位整数，则结果将为 `0x8000_0000_0000_0000` (`i64::MIN`) 或无效的操作浮点异常 (如果未屏蔽) (请参见 [`_mm_setcsr`](fn._mm_setcsr.html)))。
///
///
/// 这对应于 `CVTTSS2SI` 指令 (具有 64 位输出)。
///
/// [Intel's documentation](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_cvttss_si64)
///
///
#[inline]
#[target_feature(enable = "sse")]
#[cfg_attr(test, assert_instr(cvttss2si))]
#[stable(feature = "simd_x86", since = "1.27.0")]
pub unsafe fn _mm_cvttss_si64(a: __m128) -> i64 {
    cvttss2si64(a)
}

/// 将 64 位整数转换为 32 位浮点型。
/// 结果 vector 是输入 vector `a`，其最低 32 位浮点数已由转换后的整数替换。
///
/// 此内部函数对应于 `CVTSI2SS` 指令 (具有 64 位输入)。
///
/// [Intel's documentation](https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_cvtsi64_ss)
///
#[inline]
#[target_feature(enable = "sse")]
#[cfg_attr(test, assert_instr(cvtsi2ss))]
#[stable(feature = "simd_x86", since = "1.27.0")]
pub unsafe fn _mm_cvtsi64_ss(a: __m128, b: i64) -> __m128 {
    cvtsi642ss(a, b)
}

#[cfg(test)]
mod tests {
    use crate::core_arch::arch::x86_64::*;
    use stdarch_test::simd_test;

    #[simd_test(enable = "sse")]
    unsafe fn test_mm_cvtss_si64() {
        let inputs = &[
            (42.0f32, 42i64),
            (-31.4, -31),
            (-33.5, -34),
            (-34.5, -34),
            (4.0e10, 40_000_000_000),
            (4.0e-10, 0),
            (f32::NAN, i64::MIN),
            (2147483500.1, 2147483520),
            (9.223371e18, 9223370937343148032),
        ];
        for i in 0..inputs.len() {
            let (xi, e) = inputs[i];
            let x = _mm_setr_ps(xi, 1.0, 3.0, 4.0);
            let r = _mm_cvtss_si64(x);
            assert_eq!(
                e, r,
                "TestCase #{} _mm_cvtss_si64({:?}) = {}, expected: {}",
                i, x, r, e
            );
        }
    }

    #[simd_test(enable = "sse")]
    unsafe fn test_mm_cvttss_si64() {
        let inputs = &[
            (42.0f32, 42i64),
            (-31.4, -31),
            (-33.5, -33),
            (-34.5, -34),
            (10.999, 10),
            (-5.99, -5),
            (4.0e10, 40_000_000_000),
            (4.0e-10, 0),
            (f32::NAN, i64::MIN),
            (2147483500.1, 2147483520),
            (9.223371e18, 9223370937343148032),
            (9.223372e18, i64::MIN),
        ];
        for i in 0..inputs.len() {
            let (xi, e) = inputs[i];
            let x = _mm_setr_ps(xi, 1.0, 3.0, 4.0);
            let r = _mm_cvttss_si64(x);
            assert_eq!(
                e, r,
                "TestCase #{} _mm_cvttss_si64({:?}) = {}, expected: {}",
                i, x, r, e
            );
        }
    }

    #[simd_test(enable = "sse")]
    unsafe fn test_mm_cvtsi64_ss() {
        let inputs = &[
            (4555i64, 4555.0f32),
            (322223333, 322223330.0),
            (-432, -432.0),
            (-322223333, -322223330.0),
            (9223372036854775807, 9.223372e18),
            (-9223372036854775808, -9.223372e18),
        ];

        for i in 0..inputs.len() {
            let (x, f) = inputs[i];
            let a = _mm_setr_ps(5.0, 6.0, 7.0, 8.0);
            let r = _mm_cvtsi64_ss(a, x);
            let e = _mm_setr_ps(f, 6.0, 7.0, 8.0);
            assert_eq_m128(e, r);
        }
    }
}