x86.rs.html -- source
Description: Source to the Rust file `src\libstd\..\stdarch\crates\std_detect\src\detect\arch\x86.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
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196

    //! This module implements minimal run-time feature detection for x86.
    //!
    //! The features are detected using the `detect_features` function below.
    //! This function uses the CPUID instruction to read the feature flags from the
    //! CPU and encodes them in an `usize` where each bit position represents
    //! whether a feature is available (bit is set) or unavaiable (bit is cleared).
    //!
    //! The enum `Feature` is used to map bit positions to feature names, and the
    //! the `__crate::detect::check_for!` macro is used to map string literals (e.g.,
    //! "avx") to these bit positions (e.g., `Feature::avx`).
    //!
    //! The run-time feature detection is performed by the
    //! `__crate::detect::check_for(Feature) -> bool` function. On its first call,
    //! this functions queries the CPU for the available features and stores them
    //! in a global `AtomicUsize` variable. The query is performed by just checking
    //! whether the feature bit in this global variable is set or cleared.

    features! {
        @TARGET: x86;
        @MACRO_NAME: is_x86_feature_detected;
        @MACRO_ATTRS:
        /// A macro to test at *runtime* whether a CPU feature is available on
        /// x86/x86-64 platforms.
        ///
        /// This macro is provided in the standard library and will detect at runtime
        /// whether the specified CPU feature is detected. This does **not** resolve at
        /// compile time unless the specified feature is already enabled for the entire
        /// crate. Runtime detection currently relies mostly on the `cpuid` instruction.
        ///
        /// This macro only takes one argument which is a string literal of the feature
        /// being tested for. The feature names supported are the lowercase versions of
        /// the ones defined by Intel in [their documentation][docs].
        ///
        /// ## Supported arguments
        ///
        /// This macro supports the same names that `#[target_feature]` supports. Unlike
        /// `#[target_feature]`, however, this macro does not support names separated
        /// with a comma. Instead testing for multiple features must be done through
        /// separate macro invocations for now.
        ///
        /// Supported arguments are:
        ///
        /// * `"aes"`
        /// * `"pclmulqdq"`
        /// * `"rdrand"`
        /// * `"rdseed"`
        /// * `"tsc"`
        /// * `"mmx"`
        /// * `"sse"`
        /// * `"sse2"`
        /// * `"sse3"`
        /// * `"ssse3"`
        /// * `"sse4.1"`
        /// * `"sse4.2"`
        /// * `"sse4a"`
        /// * `"sha"`
        /// * `"avx"`
        /// * `"avx2"`
        /// * `"avx512f"`
        /// * `"avx512cd"`
        /// * `"avx512er"`
        /// * `"avx512pf"`
        /// * `"avx512bw"`
        /// * `"avx512dq"`
        /// * `"avx512vl"`
        /// * `"avx512ifma"`
        /// * `"avx512vbmi"`
        /// * `"avx512vpopcntdq"`
        /// * `"avx512vbmi2"`
        /// * `"avx512gfni"`
        /// * `"avx512vaes"`
        /// * `"avx512vpclmulqdq"`
        /// * `"avx512vnni"`
        /// * `"avx512bitalg"`
        /// * `"avx512bf16"`
        /// * `"avx512vp2intersect"`
        /// * `"f16c"`
        /// * `"fma"`
        /// * `"bmi1"`
        /// * `"bmi2"`
        /// * `"abm"`
        /// * `"lzcnt"`
        /// * `"tbm"`
        /// * `"popcnt"`
        /// * `"fxsr"`
        /// * `"xsave"`
        /// * `"xsaveopt"`
        /// * `"xsaves"`
        /// * `"xsavec"`
        /// * `"cmpxchg16b"`
        /// * `"adx"`
        /// * `"rtm"`
        ///
        /// [docs]: https://software.intel.com/sites/landingpage/IntrinsicsGuide
        #[stable(feature = "simd_x86", since = "1.27.0")]
        @BIND_FEATURE_NAME: "abm"; "lzcnt"; // abm is a synonym for lzcnt
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] aes: "aes";
        /// AES (Advanced Encryption Standard New Instructions AES-NI)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] pclmulqdq: "pclmulqdq";
        /// CLMUL (Carry-less Multiplication)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] rdrand: "rdrand";
        /// RDRAND
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] rdseed: "rdseed";
        /// RDSEED
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] tsc: "tsc";
        /// TSC (Time Stamp Counter)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] mmx: "mmx";
        /// MMX (MultiMedia eXtensions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] sse: "sse";
        /// SSE (Streaming SIMD Extensions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] sse2: "sse2";
        /// SSE2 (Streaming SIMD Extensions 2)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] sse3: "sse3";
        /// SSE3 (Streaming SIMD Extensions 3)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] ssse3: "ssse3";
        /// SSSE3 (Supplemental Streaming SIMD Extensions 3)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] sse4_1: "sse4.1";
        /// SSE4.1 (Streaming SIMD Extensions 4.1)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] sse4_2: "sse4.2";
        /// SSE4.2 (Streaming SIMD Extensions 4.2)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] sse4a: "sse4a";
        /// SSE4a (Streaming SIMD Extensions 4a)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] sha: "sha";
        /// SHA
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx: "avx";
        /// AVX (Advanced Vector Extensions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx2: "avx2";
        /// AVX2 (Advanced Vector Extensions 2)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512f: "avx512f" ;
        /// AVX-512 F (Foundation)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512cd: "avx512cd" ;
        /// AVX-512 CD (Conflict Detection Instructions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512er: "avx512er";
        /// AVX-512 ER (Expo nential and Reciprocal Instructions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512pf: "avx512pf";
        /// AVX-512 PF (Prefetch Instructions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512bw: "avx512bw";
        /// AVX-512 BW (Byte and Word Instructions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512dq: "avx512dq";
        /// AVX-512 DQ (Doubleword and Quadword)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512vl: "avx512vl";
        /// AVX-512 VL (Vector Length Extensions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512ifma: "avx512ifma";
        /// AVX-512 IFMA (Integer Fused Multiply Add)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512vbmi: "avx512vbmi";
        /// AVX-512 VBMI (Vector Byte Manipulation Instructions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512vpopcntdq: "avx512vpopcntdq";
        /// AVX-512 VPOPCNTDQ (Vector Population Count Doubleword and
        /// Quadword)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512vbmi2: "avx512vbmi2";
        /// AVX-512 VBMI2 (Additional byte, word, dword and qword capabilities)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512gfni: "avx512gfni";
        /// AVX-512 GFNI (Galois Field New Instruction)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512vaes: "avx512vaes";
        /// AVX-512 VAES (Vector AES instruction)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512vpclmulqdq: "avx512vpclmulqdq";
        /// AVX-512 VPCLMULQDQ (Vector PCLMULQDQ instructions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512vnni: "avx512vnni";
        /// AVX-512 VNNI (Vector Neural Network Instructions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512bitalg: "avx512bitalg";
        /// AVX-512 BITALG (Support for VPOPCNT[B,W] and VPSHUFBITQMB)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512bf16: "avx512bf16";
        /// AVX-512 BF16 (BFLOAT16 instructions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] avx512vp2intersect: "avx512vp2intersect";
        /// AVX-512 P2INTERSECT
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] f16c: "f16c";
        /// F16C (Conversions between IEEE-754 `binary16` and `binary32` formats)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] fma: "fma";
        /// FMA (Fused Multiply Add)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] bmi1: "bmi1" ;
        /// BMI1 (Bit Manipulation Instructions 1)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] bmi2: "bmi2" ;
        /// BMI2 (Bit Manipulation Instructions 2)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] lzcnt: "lzcnt";
        /// ABM (Advanced Bit Manipulation) / LZCNT (Leading Zero Count)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] tbm: "tbm";
        /// TBM (Trailing Bit Manipulation)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] popcnt: "popcnt";
        /// POPCNT (Population Count)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] fxsr: "fxsr";
        /// FXSR (Floating-point context fast save and restor)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] xsave: "xsave";
        /// XSAVE (Save Processor Extended States)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] xsaveopt: "xsaveopt";
        /// XSAVEOPT (Save Processor Extended States Optimized)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] xsaves: "xsaves";
        /// XSAVES (Save Processor Extended States Supervisor)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] xsavec: "xsavec";
        /// XSAVEC (Save Processor Extended States Compacted)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] cmpxchg16b: "cmpxchg16b";
        /// CMPXCH16B (16-byte compare-and-swap instruction)
        @FEATURE: #[stable(feature = "simd_x86_adx", since = "1.33.0")] adx: "adx";
        /// ADX, Intel ADX (Multi-Precision Add-Carry Instruction Extensions)
        @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] rtm: "rtm";
        /// RTM, Intel (Restricted Transactional Memory)
    }