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    //! Streaming SIMD Extensions 4.2 (SSE4.2)
    //!
    //! Extends SSE4.1 with STTNI (String and Text New Instructions).

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

    use coresimd::simd::*;
    use coresimd::simd_llvm::*;
    use coresimd::x86::*;

    /// String contains unsigned 8-bit characters *(Default)*
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_UBYTE_OPS: i32 = 0b0000_0000;
    /// String contains unsigned 16-bit characters
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_UWORD_OPS: i32 = 0b0000_0001;
    /// String contains signed 8-bit characters
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_SBYTE_OPS: i32 = 0b0000_0010;
    /// String contains unsigned 16-bit characters
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_SWORD_OPS: i32 = 0b0000_0011;

    /// For each character in `a`, find if it is in `b` *(Default)*
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_CMP_EQUAL_ANY: i32 = 0b0000_0000;
    /// For each character in `a`, determine if
    /// `b[0] <= c <= b[1] or b[1] <= c <= b[2]...`
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_CMP_RANGES: i32 = 0b0000_0100;
    /// The strings defined by `a` and `b` are equal
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_CMP_EQUAL_EACH: i32 = 0b0000_1000;
    /// Search for the defined substring in the target
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_CMP_EQUAL_ORDERED: i32 = 0b0000_1100;

    /// Do not negate results *(Default)*
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_POSITIVE_POLARITY: i32 = 0b0000_0000;
    /// Negate results
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_NEGATIVE_POLARITY: i32 = 0b0001_0000;
    /// Do not negate results before the end of the string
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_MASKED_POSITIVE_POLARITY: i32 = 0b0010_0000;
    /// Negate results only before the end of the string
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_MASKED_NEGATIVE_POLARITY: i32 = 0b0011_0000;

    /// **Index only**: return the least significant bit *(Default)*
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_LEAST_SIGNIFICANT: i32 = 0b0000_0000;
    /// **Index only**: return the most significant bit
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_MOST_SIGNIFICANT: i32 = 0b0100_0000;

    /// **Mask only**: return the bit mask
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_BIT_MASK: i32 = 0b0000_0000;
    /// **Mask only**: return the byte mask
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_UNIT_MASK: i32 = 0b0100_0000;

    /// Compare packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return the generated mask.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistrm)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistrm, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistrm(a: __m128i, b: __m128i, imm8: i32) -> __m128i {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistrm128(a, b, $imm8)
            };
        }
        mem::transmute(constify_imm8!(imm8, call))
    }

    /// Compare packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8` and return the generated index. Similar to
    /// [`_mm_cmpestri`] with the exception that [`_mm_cmpestri`] requires the
    /// lengths of `a` and `b` to be explicitly specified.
    ///
    /// # Control modes
    ///
    /// The control specified by `imm8` may be one or more of the following.
    ///
    /// ## Data size and signedness
    ///
    ///  - [`_SIDD_UBYTE_OPS`] - Default
    ///  - [`_SIDD_UWORD_OPS`]
    ///  - [`_SIDD_SBYTE_OPS`]
    ///  - [`_SIDD_SWORD_OPS`]
    ///
    /// ## Comparison options
    ///  - [`_SIDD_CMP_EQUAL_ANY`] - Default
    ///  - [`_SIDD_CMP_RANGES`]
    ///  - [`_SIDD_CMP_EQUAL_EACH`]
    ///  - [`_SIDD_CMP_EQUAL_ORDERED`]
    ///
    /// ## Result polarity
    ///  - [`_SIDD_POSITIVE_POLARITY`] - Default
    ///  - [`_SIDD_NEGATIVE_POLARITY`]
    ///
    /// ## Bit returned
    ///  - [`_SIDD_LEAST_SIGNIFICANT`] - Default
    ///  - [`_SIDD_MOST_SIGNIFICANT`]
    ///
    /// # Examples
    ///
    /// Find a substring using [`_SIDD_CMP_EQUAL_ORDERED`]
    ///
    /// ```
    /// # #![feature(stdsimd)]
    /// # #![cfg_attr(not(dox), no_std)]
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate std as real_std;
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate stdsimd as std;
    /// # #[cfg(not(dox))]
    /// # use real_std::prelude::v1::*;
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    /// let haystack = b"This is a long string of text data\r\n\tthat extends
    /// multiple lines";
    /// let needle = b"\r\n\t\0\0\0\0\0\0\0\0\0\0\0\0\0";
    ///
    /// let a = _mm_loadu_si128(needle.as_ptr() as *const _);
    /// let hop = 16;
    /// let mut indexes = Vec::new();
    ///
    /// // Chunk the haystack into 16 byte chunks and find
    /// // the first "\r\n\t" in the chunk.
    /// for (i, chunk) in haystack.chunks(hop).enumerate() {
    ///     let b = _mm_loadu_si128(chunk.as_ptr() as *const _);
    ///     let idx = _mm_cmpistri(a, b, _SIDD_CMP_EQUAL_ORDERED);
    ///     if idx != 16 {
    ///         indexes.push((idx as usize) + (i * hop));
    ///     }
    /// }
    /// assert_eq!(indexes, vec![34]);
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// The `_mm_cmpistri` intrinsic may also be used to find the existance of
    /// one or more of a given set of characters in the haystack.
    ///
    /// ```
    /// # #![feature(stdsimd)]
    /// # #![cfg_attr(not(dox), no_std)]
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate std as real_std;
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate stdsimd as std;
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    /// // Ensure your input is 16 byte aligned
    /// let password = b"hunter2\0\0\0\0\0\0\0\0\0";
    /// let special_chars = b"!@#$%^&*()[]:;<>";
    ///
    /// // Load the input
    /// let a = _mm_loadu_si128(special_chars.as_ptr() as *const _);
    /// let b = _mm_loadu_si128(password.as_ptr() as *const _);
    ///
    /// // Use _SIDD_CMP_EQUAL_ANY to find the index of any bytes in b
    /// let idx = _mm_cmpistri(a.into(), b.into(), _SIDD_CMP_EQUAL_ANY);
    ///
    /// if idx < 16 {
    ///     println!("Congrats! Your password contains a special character");
    ///     # panic!("{:?} does not contain a special character", password);
    /// } else {
    ///     println!("Your password should contain a special character");
    /// }
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// Find the index of the first character in the haystack that is within a
    /// range of characters.
    ///
    /// ```
    /// # #![feature(stdsimd)]
    /// # #![cfg_attr(not(dox), no_std)]
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate std as real_std;
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate stdsimd as std;
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    /// # let b = b":;<=>?@[\\]^_`abc";
    /// # let b = _mm_loadu_si128(b.as_ptr() as *const _);
    ///
    /// // Specify the ranges of values to be searched for [A-Za-z0-9].
    /// let a = b"AZaz09\0\0\0\0\0\0\0\0\0\0";
    /// let a = _mm_loadu_si128(a.as_ptr() as *const _);
    ///
    /// // Use _SIDD_CMP_RANGES to find the index of first byte in ranges.
    /// // Which in this case will be the first alpha numeric byte found
    /// // in the string.
    /// let idx = _mm_cmpistri(a, b, _SIDD_CMP_RANGES);
    ///
    /// if idx < 16 {
    ///     println!("Found an alpha numeric character");
    ///     # assert_eq!(idx, 13);
    /// } else {
    ///     println!("Did not find an alpha numeric character");
    /// }
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// Working with 16-bit characters.
    ///
    /// ```
    /// # #![feature(stdsimd)]
    /// # #![cfg_attr(not(dox), no_std)]
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate std as real_std;
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate stdsimd as std;
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    /// # let mut some_utf16_words = [0u16; 8];
    /// # let mut more_utf16_words = [0u16; 8];
    /// # '❤'.encode_utf16(&mut some_utf16_words);
    /// # '𝕊'.encode_utf16(&mut more_utf16_words);
    /// // Load the input
    /// let a = _mm_loadu_si128(some_utf16_words.as_ptr() as *const _);
    /// let b = _mm_loadu_si128(more_utf16_words.as_ptr() as *const _);
    ///
    /// // Specify _SIDD_UWORD_OPS to compare words instead of bytes, and
    /// // use _SIDD_CMP_EQUAL_EACH to compare the two strings.
    /// let idx = _mm_cmpistri(a, b, _SIDD_UWORD_OPS | _SIDD_CMP_EQUAL_EACH);
    ///
    /// if idx == 0 {
    ///     println!("16-bit unicode strings were equal!");
    ///     # panic!("Strings should not be equal!")
    /// } else {
    ///     println!("16-bit unicode strings were not equal!");
    /// }
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// [`_SIDD_UBYTE_OPS`]: constant._SIDD_UBYTE_OPS.html
    /// [`_SIDD_UWORD_OPS`]: constant._SIDD_UWORD_OPS.html
    /// [`_SIDD_SBYTE_OPS`]: constant._SIDD_SBYTE_OPS.html
    /// [`_SIDD_SWORD_OPS`]: constant._SIDD_SWORD_OPS.html
    /// [`_SIDD_CMP_EQUAL_ANY`]: constant._SIDD_CMP_EQUAL_ANY.html
    /// [`_SIDD_CMP_RANGES`]: constant._SIDD_CMP_RANGES.html
    /// [`_SIDD_CMP_EQUAL_EACH`]: constant._SIDD_CMP_EQUAL_EACH.html
    /// [`_SIDD_CMP_EQUAL_ORDERED`]: constant._SIDD_CMP_EQUAL_ORDERED.html
    /// [`_SIDD_POSITIVE_POLARITY`]: constant._SIDD_POSITIVE_POLARITY.html
    /// [`_SIDD_NEGATIVE_POLARITY`]: constant._SIDD_NEGATIVE_POLARITY.html
    /// [`_SIDD_LEAST_SIGNIFICANT`]: constant._SIDD_LEAST_SIGNIFICANT.html
    /// [`_SIDD_MOST_SIGNIFICANT`]: constant._SIDD_MOST_SIGNIFICANT.html
    /// [`_mm_cmpestri`]: fn._mm_cmpestri.html
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistri)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistri(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistri128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return `1` if any character in `b` was null.
    /// and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistrz)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistrz(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistriz128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return `1` if the resulting mask was non-zero,
    /// and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistrc)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistrc(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistric128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and returns `1` if any character in `a` was null,
    /// and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistrs)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistrs(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistris128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return bit `0` of the resulting bit mask.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistro)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistro(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistrio128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return `1` if `b` did not contain a null
    /// character and the resulting mask was zero, and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistra)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistra(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistria128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return the generated mask.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestrm)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestrm, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestrm(
        a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32,
    ) -> __m128i {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestrm128(a, la, b, lb, $imm8)
            };
        }
        mem::transmute(constify_imm8!(imm8, call))
    }

    /// Compare packed strings `a` and `b` with lengths `la` and `lb` using the
    /// control in `imm8` and return the generated index. Similar to
    /// [`_mm_cmpistri`] with the exception that [`_mm_cmpistri`] implicitly
    /// determines the length of `a` and `b`.
    ///
    /// # Control modes
    ///
    /// The control specified by `imm8` may be one or more of the following.
    ///
    /// ## Data size and signedness
    ///
    ///  - [`_SIDD_UBYTE_OPS`] - Default
    ///  - [`_SIDD_UWORD_OPS`]
    ///  - [`_SIDD_SBYTE_OPS`]
    ///  - [`_SIDD_SWORD_OPS`]
    ///
    /// ## Comparison options
    ///  - [`_SIDD_CMP_EQUAL_ANY`] - Default
    ///  - [`_SIDD_CMP_RANGES`]
    ///  - [`_SIDD_CMP_EQUAL_EACH`]
    ///  - [`_SIDD_CMP_EQUAL_ORDERED`]
    ///
    /// ## Result polarity
    ///  - [`_SIDD_POSITIVE_POLARITY`] - Default
    ///  - [`_SIDD_NEGATIVE_POLARITY`]
    ///
    /// ## Bit returned
    ///  - [`_SIDD_LEAST_SIGNIFICANT`] - Default
    ///  - [`_SIDD_MOST_SIGNIFICANT`]
    ///
    /// # Examples
    ///
    /// ```
    /// # #![feature(stdsimd)]
    /// # #![cfg_attr(not(dox), no_std)]
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate std as real_std;
    /// # #[cfg(not(dox))]
    /// # #[macro_use]
    /// # extern crate stdsimd as std;
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    ///
    /// // The string we want to find a substring in
    /// let haystack = b"Split \r\n\t line  ";
    ///
    /// // The string we want to search for with some
    /// // extra bytes we do not want to search for.
    /// let needle = b"\r\n\t ignore this ";
    ///
    /// let a = _mm_loadu_si128(needle.as_ptr() as *const _);
    /// let b = _mm_loadu_si128(haystack.as_ptr() as *const _);
    ///
    /// // Note: We explicitly specify we only want to search `b` for the
    /// // first 3 characters of a.
    /// let idx = _mm_cmpestri(a, 3, b, 15, _SIDD_CMP_EQUAL_ORDERED);
    ///
    /// assert_eq!(idx, 6);
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// [`_SIDD_UBYTE_OPS`]: constant._SIDD_UBYTE_OPS.html
    /// [`_SIDD_UWORD_OPS`]: constant._SIDD_UWORD_OPS.html
    /// [`_SIDD_SBYTE_OPS`]: constant._SIDD_SBYTE_OPS.html
    /// [`_SIDD_SWORD_OPS`]: constant._SIDD_SWORD_OPS.html
    /// [`_SIDD_CMP_EQUAL_ANY`]: constant._SIDD_CMP_EQUAL_ANY.html
    /// [`_SIDD_CMP_RANGES`]: constant._SIDD_CMP_RANGES.html
    /// [`_SIDD_CMP_EQUAL_EACH`]: constant._SIDD_CMP_EQUAL_EACH.html
    /// [`_SIDD_CMP_EQUAL_ORDERED`]: constant._SIDD_CMP_EQUAL_ORDERED.html
    /// [`_SIDD_POSITIVE_POLARITY`]: constant._SIDD_POSITIVE_POLARITY.html
    /// [`_SIDD_NEGATIVE_POLARITY`]: constant._SIDD_NEGATIVE_POLARITY.html
    /// [`_SIDD_LEAST_SIGNIFICANT`]: constant._SIDD_LEAST_SIGNIFICANT.html
    /// [`_SIDD_MOST_SIGNIFICANT`]: constant._SIDD_MOST_SIGNIFICANT.html
    /// [`_mm_cmpistri`]: fn._mm_cmpistri.html
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestri)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestri(
        a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32,
    ) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestri128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return `1` if any character in
    /// `b` was null, and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestrz)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestrz(
        a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32,
    ) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestriz128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return `1` if the resulting mask
    /// was non-zero, and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestrc)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestrc(
        a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32,
    ) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestric128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return `1` if any character in
    /// a was null, and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestrs)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestrs(
        a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32,
    ) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestris128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return bit `0` of the resulting
    /// bit mask.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestro)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestro(
        a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32,
    ) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestrio128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compare packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return `1` if `b` did not
    /// contain a null character and the resulting mask was zero, and `0`
    /// otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestra)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestra(
        a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32,
    ) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestria128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Starting with the initial value in `crc`, return the accumulated
    /// CRC32 value for unsigned 8-bit integer `v`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_crc32_u8)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(crc32))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_crc32_u8(crc: u32, v: u8) -> u32 {
        crc32_32_8(crc, v)
    }

    /// Starting with the initial value in `crc`, return the accumulated
    /// CRC32 value for unsigned 16-bit integer `v`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_crc32_u16)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(crc32))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_crc32_u16(crc: u32, v: u16) -> u32 {
        crc32_32_16(crc, v)
    }

    /// Starting with the initial value in `crc`, return the accumulated
    /// CRC32 value for unsigned 32-bit integer `v`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_crc32_u32)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(crc32))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_crc32_u32(crc: u32, v: u32) -> u32 {
        crc32_32_32(crc, v)
    }

    /// Compare packed 64-bit integers in `a` and `b` for greater-than,
    /// return the results.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpgt_epi64)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpgtq))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpgt_epi64(a: __m128i, b: __m128i) -> __m128i {
        mem::transmute(simd_gt::<_, i64x2>(a.as_i64x2(), b.as_i64x2()))
    }

    #[allow(improper_ctypes)]
    extern "C" {
        // SSE 4.2 string and text comparison ops
        #[link_name = "llvm.x86.sse42.pcmpestrm128"]
        fn pcmpestrm128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> u8x16;
        #[link_name = "llvm.x86.sse42.pcmpestri128"]
        fn pcmpestri128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestriz128"]
        fn pcmpestriz128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestric128"]
        fn pcmpestric128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestris128"]
        fn pcmpestris128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestrio128"]
        fn pcmpestrio128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestria128"]
        fn pcmpestria128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistrm128"]
        fn pcmpistrm128(a: i8x16, b: i8x16, imm8: i8) -> i8x16;
        #[link_name = "llvm.x86.sse42.pcmpistri128"]
        fn pcmpistri128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistriz128"]
        fn pcmpistriz128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistric128"]
        fn pcmpistric128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistris128"]
        fn pcmpistris128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistrio128"]
        fn pcmpistrio128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistria128"]
        fn pcmpistria128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        // SSE 4.2 CRC instructions
        #[link_name = "llvm.x86.sse42.crc32.32.8"]
        fn crc32_32_8(crc: u32, v: u8) -> u32;
        #[link_name = "llvm.x86.sse42.crc32.32.16"]
        fn crc32_32_16(crc: u32, v: u16) -> u32;
        #[link_name = "llvm.x86.sse42.crc32.32.32"]
        fn crc32_32_32(crc: u32, v: u32) -> u32;
    }

    #[cfg(test)]
    mod tests {
        use stdsimd_test::simd_test;

        use coresimd::x86::*;
        use std::ptr;

        // Currently one cannot `load` a &[u8] that is is less than 16
        // in length. This makes loading strings less than 16 in length
        // a bit difficult. Rather than `load` and mutate the __m128i,
        // it is easier to memcpy the given string to a local slice with
        // length 16 and `load` the local slice.
        #[target_feature(enable = "sse4.2")]
        unsafe fn str_to_m128i(s: &[u8]) -> __m128i {
            assert!(s.len() <= 16);
            let slice = &mut [0u8; 16];
            ptr::copy_nonoverlapping(
                s.get_unchecked(0) as *const u8 as *const u8,
                slice.get_unchecked_mut(0) as *mut u8 as *mut u8,
                s.len(),
            );
            _mm_loadu_si128(slice.as_ptr() as *const _)
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistrm() {
            let a = str_to_m128i(b"Hello! Good-Bye!");
            let b = str_to_m128i(b"hello! good-bye!");
            let i = _mm_cmpistrm(a, b, _SIDD_UNIT_MASK);
            #[cfg_attr(rustfmt, rustfmt_skip)]
            let res = _mm_setr_epi8(
                0x00, !0, !0, !0, !0, !0, !0, 0x00,
                !0, !0, !0, !0, 0x00, !0, !0, !0,
            );
            assert_eq_m128i(i, res);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistri() {
            let a = str_to_m128i(b"Hello");
            let b = str_to_m128i(b"   Hello        ");
            let i = _mm_cmpistri(a, b, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(3, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistrz() {
            let a = str_to_m128i(b"");
            let b = str_to_m128i(b"Hello");
            let i = _mm_cmpistrz(a, b, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistrc() {
            let a = str_to_m128i(b"                ");
            let b = str_to_m128i(b"       !        ");
            let i = _mm_cmpistrc(a, b, _SIDD_UNIT_MASK);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistrs() {
            let a = str_to_m128i(b"Hello");
            let b = str_to_m128i(b"");
            let i = _mm_cmpistrs(a, b, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistro() {
            #[cfg_attr(rustfmt, rustfmt_skip)]
            let a_bytes = _mm_setr_epi8(
                0x00, 0x47, 0x00, 0x65, 0x00, 0x6c, 0x00, 0x6c,
                0x00, 0x6f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            );
            #[cfg_attr(rustfmt, rustfmt_skip)]
            let b_bytes = _mm_setr_epi8(
                0x00, 0x48, 0x00, 0x65, 0x00, 0x6c, 0x00, 0x6c,
                0x00, 0x6f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            );
            let a = a_bytes;
            let b = b_bytes;
            let i = _mm_cmpistro(a, b, _SIDD_UWORD_OPS | _SIDD_UNIT_MASK);
            assert_eq!(0, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistra() {
            let a = str_to_m128i(b"");
            let b = str_to_m128i(b"Hello!!!!!!!!!!!");
            let i = _mm_cmpistra(a, b, _SIDD_UNIT_MASK);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestrm() {
            let a = str_to_m128i(b"Hello!");
            let b = str_to_m128i(b"Hello.");
            let i = _mm_cmpestrm(a, 5, b, 5, _SIDD_UNIT_MASK);
            #[cfg_attr(rustfmt, rustfmt_skip)]
            let r = _mm_setr_epi8(
                !0, !0, !0, !0, !0, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
            );
            assert_eq_m128i(i, r);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestri() {
            let a = str_to_m128i(b"bar - garbage");
            let b = str_to_m128i(b"foobar");
            let i = _mm_cmpestri(a, 3, b, 6, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(3, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestrz() {
            let a = str_to_m128i(b"");
            let b = str_to_m128i(b"Hello");
            let i = _mm_cmpestrz(a, 16, b, 6, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestrc() {
            let va = str_to_m128i(b"!!!!!!!!");
            let vb = str_to_m128i(b"        ");
            let i = _mm_cmpestrc(va, 7, vb, 7, _SIDD_UNIT_MASK);
            assert_eq!(0, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestrs() {
            #[cfg_attr(rustfmt, rustfmt_skip)]
            let a_bytes = _mm_setr_epi8(
                0x00, 0x48, 0x00, 0x65, 0x00, 0x6c, 0x00, 0x6c,
                0x00, 0x6f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            );
            let a = a_bytes;
            let b = _mm_set1_epi8(0x00);
            let i = _mm_cmpestrs(a, 8, b, 0, _SIDD_UWORD_OPS);
            assert_eq!(0, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestro() {
            let a = str_to_m128i(b"Hello");
            let b = str_to_m128i(b"World");
            let i = _mm_cmpestro(a, 5, b, 5, _SIDD_UBYTE_OPS);
            assert_eq!(0, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestra() {
            let a = str_to_m128i(b"Cannot match a");
            let b = str_to_m128i(b"Null after 14");
            let i =
                _mm_cmpestra(a, 14, b, 16, _SIDD_CMP_EQUAL_EACH | _SIDD_UNIT_MASK);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_crc32_u8() {
            let crc = 0x2aa1e72b;
            let v = 0x2a;
            let i = _mm_crc32_u8(crc, v);
            assert_eq!(i, 0xf24122e4);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_crc32_u16() {
            let crc = 0x8ecec3b5;
            let v = 0x22b;
            let i = _mm_crc32_u16(crc, v);
            assert_eq!(i, 0x13bb2fb);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_crc32_u32() {
            let crc = 0xae2912c8;
            let v = 0x845fed;
            let i = _mm_crc32_u32(crc, v);
            assert_eq!(i, 0xffae2ed1);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpgt_epi64() {
            let a = _mm_setr_epi64x(0, 0x2a);
            let b = _mm_set1_epi64x(0x00);
            let i = _mm_cmpgt_epi64(a, b);
            assert_eq_m128i(
                i,
                _mm_setr_epi64x(0x00, 0xffffffffffffffffu64 as i64),
            );
        }
    }

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