sse4a.rs.html -- source
Description: Source to the Rust file `src/libcore/../stdsimd/coresimd/x86/sse4a.rs`.
Keywords: rust, rustlang, rust-lang

      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
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159

    //! `i686`'s Streaming SIMD Extensions 4a (`SSE4a`)

    use coresimd::simd::*;
    use coresimd::x86::*;
    use mem;

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

    #[allow(improper_ctypes)]
    extern "C" {
        #[link_name = "llvm.x86.sse4a.extrq"]
        fn extrq(x: i64x2, y: i8x16) -> i64x2;
        #[link_name = "llvm.x86.sse4a.insertq"]
        fn insertq(x: i64x2, y: i64x2) -> i64x2;
        #[link_name = "llvm.x86.sse4a.movnt.sd"]
        fn movntsd(x: *mut f64, y: __m128d);
        #[link_name = "llvm.x86.sse4a.movnt.ss"]
        fn movntss(x: *mut f32, y: __m128);
    }

    // FIXME(blocked on #248): _mm_extracti_si64(x, len, idx) // EXTRQ
    // FIXME(blocked on #248): _mm_inserti_si64(x, y, len, idx) // INSERTQ

    /// Extracts the bit range specified by `y` from the lower 64 bits of `x`.
    ///
    /// The `[13:8]` bits of `y` specify the index of the bit-range to extract. The
    /// `[5:0]` bits of `y` specify the length of the bit-range to extract. All
    /// other bits are ignored.
    ///
    /// If the length is zero, it is interpreted as `64`. If the length and index
    /// are zero, the lower 64 bits of `x` are extracted.
    ///
    /// If `length == 0 && index > 0` or `lenght + index > 64` the result is
    /// undefined.
    #[inline]
    #[target_feature(enable = "sse4a")]
    #[cfg_attr(test, assert_instr(extrq))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_extract_si64(x: __m128i, y: __m128i) -> __m128i {
        mem::transmute(extrq(x.as_i64x2(), y.as_i8x16()))
    }

    /// Inserts the `[length:0]` bits of `y` into `x` at `index`.
    ///
    /// The bits of `y`:
    ///
    /// - `[69:64]` specify the `length`,
    /// - `[77:72]` specify the index.
    ///
    /// If the `length` is zero it is interpreted as `64`. If `index + length > 64`
    /// or `index > 0 && length == 0` the result is undefined.
    #[inline]
    #[target_feature(enable = "sse4a")]
    #[cfg_attr(test, assert_instr(insertq))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_insert_si64(x: __m128i, y: __m128i) -> __m128i {
        mem::transmute(insertq(x.as_i64x2(), y.as_i64x2()))
    }

    /// Non-temporal store of `a.0` into `p`.
    #[inline]
    #[target_feature(enable = "sse4a")]
    #[cfg_attr(test, assert_instr(movntsd))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_stream_sd(p: *mut f64, a: __m128d) {
        movntsd(p, a);
    }

    /// Non-temporal store of `a.0` into `p`.
    #[inline]
    #[target_feature(enable = "sse4a")]
    #[cfg_attr(test, assert_instr(movntss))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_stream_ss(p: *mut f32, a: __m128) {
        movntss(p, a);
    }

    #[cfg(test)]
    mod tests {
        use coresimd::x86::*;
        use stdsimd_test::simd_test;

        #[simd_test(enable = "sse4a")]
        unsafe fn test_mm_extract_si64() {
            let b = 0b0110_0000_0000_i64;
            //        ^^^^ bit range extracted
            let x = _mm_setr_epi64x(b, 0);
            let v = 0b001000___00___000100_i64;
            //        ^idx: 2^3 = 8 ^length = 2^2 = 4
            let y = _mm_setr_epi64x(v, 0);
            let e = _mm_setr_epi64x(0b0110_i64, 0);
            let r = _mm_extract_si64(x, y);
            assert_eq_m128i(r, e);
        }

        #[simd_test(enable = "sse4a")]
        unsafe fn test_mm_insert_si64() {
            let i = 0b0110_i64;
            //        ^^^^ bit range inserted
            let z = 0b1010_1010_1010i64;
            //        ^^^^ bit range replaced
            let e = 0b0110_1010_1010i64;
            //        ^^^^ replaced 1010 with 0110
            let x = _mm_setr_epi64x(z, 0);
            let expected = _mm_setr_epi64x(e, 0);
            let v = 0b001000___00___000100_i64;
            //        ^idx: 2^3 = 8 ^length = 2^2 = 4
            let y = _mm_setr_epi64x(i, v);
            let r = _mm_insert_si64(x, y);
            assert_eq_m128i(r, expected);
        }

        #[repr(align(16))]
        struct MemoryF64 {
            data: [f64; 2],
        }

        #[simd_test(enable = "sse4a")]
        unsafe fn test_mm_stream_sd() {
            let mut mem = MemoryF64 {
                data: [1.0_f64, 2.0],
            };
            {
                let vals = &mut mem.data;
                let d = vals.as_mut_ptr();

                let x = _mm_setr_pd(3.0, 4.0);

                _mm_stream_sd(d, x);
            }
            assert_eq!(mem.data[0], 3.0);
            assert_eq!(mem.data[1], 2.0);
        }

        #[repr(align(16))]
        struct MemoryF32 {
            data: [f32; 4],
        }

        #[simd_test(enable = "sse4a")]
        unsafe fn test_mm_stream_ss() {
            let mut mem = MemoryF32 {
                data: [1.0_f32, 2.0, 3.0, 4.0],
            };
            {
                let vals = &mut mem.data;
                let d = vals.as_mut_ptr();

                let x = _mm_setr_ps(5.0, 6.0, 7.0, 8.0);

                _mm_stream_ss(d, x);
            }
            assert_eq!(mem.data[0], 5.0);
            assert_eq!(mem.data[1], 2.0);
            assert_eq!(mem.data[2], 3.0);
            assert_eq!(mem.data[3], 4.0);
        }
    }

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)