Macro is_x86_feature_detected 

macro_rules! is_x86_feature_detected {
    ("aes") => { ... };
    ("pclmulqdq") => { ... };
    ("rdrand") => { ... };
    ("rdseed") => { ... };
    ("tsc") => { ... };
    ("mmx") => { ... };
    ("sse") => { ... };
    ("sse2") => { ... };
    ("sse3") => { ... };
    ("ssse3") => { ... };
    ("sse4.1") => { ... };
    ("sse4.2") => { ... };
    ("sse4a") => { ... };
    ("sha") => { ... };
    ("avx") => { ... };
    ("avx2") => { ... };
    ("sha512") => { ... };
    ("sm3") => { ... };
    ("sm4") => { ... };
    ("avx512f") => { ... };
    ("avx512cd") => { ... };
    ("avx512er") => { ... };
    ("avx512pf") => { ... };
    ("avx512bw") => { ... };
    ("avx512dq") => { ... };
    ("avx512vl") => { ... };
    ("avx512ifma") => { ... };
    ("avx512vbmi") => { ... };
    ("avx512vpopcntdq") => { ... };
    ("avx512vbmi2") => { ... };
    ("gfni") => { ... };
    ("vaes") => { ... };
    ("vpclmulqdq") => { ... };
    ("avx512vnni") => { ... };
    ("avx512bitalg") => { ... };
    ("avx512bf16") => { ... };
    ("avx512vp2intersect") => { ... };
    ("avx512fp16") => { ... };
    ("avxifma") => { ... };
    ("avxneconvert") => { ... };
    ("avxvnni") => { ... };
    ("avxvnniint16") => { ... };
    ("avxvnniint8") => { ... };
    ("amx-tile") => { ... };
    ("amx-int8") => { ... };
    ("amx-bf16") => { ... };
    ("amx-fp16") => { ... };
    ("amx-complex") => { ... };
    ("amx-avx512") => { ... };
    ("amx-fp8") => { ... };
    ("amx-movrs") => { ... };
    ("amx-tf32") => { ... };
    ("apxf") => { ... };
    ("avx10.1") => { ... };
    ("avx10.2") => { ... };
    ("f16c") => { ... };
    ("fma") => { ... };
    ("bmi1") => { ... };
    ("bmi2") => { ... };
    ("lzcnt") => { ... };
    ("tbm") => { ... };
    ("popcnt") => { ... };
    ("fxsr") => { ... };
    ("xsave") => { ... };
    ("xsaveopt") => { ... };
    ("xsaves") => { ... };
    ("xsavec") => { ... };
    ("cmpxchg16b") => { ... };
    ("kl") => { ... };
    ("widekl") => { ... };
    ("adx") => { ... };
    ("rtm") => { ... };
    ("movbe") => { ... };
    ("movrs") => { ... };
    ("ermsb") => { ... };
    ("xop") => { ... };
    ("abm") => { ... };
    ("avx512gfni") => { ... };
    ("avx512vaes") => { ... };
    ("avx512vpclmulqdq") => { ... };
    ($t:tt,) => { ... };
    ($t:tt) => { ... };
}

Check for the presence of a CPU feature at runtime.

When the feature is known to be enabled at compile time (e.g. via -Ctarget-feature) the macro expands to true.

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.

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"
• "sha512"
• "sm3"
• "sm4"
• "avx512f"
• "avx512cd"
• "avx512er"
• "avx512pf"
• "avx512bw"
• "avx512dq"
• "avx512vl"
• "avx512ifma"
• "avx512vbmi"
• "avx512vpopcntdq"
• "avx512vbmi2"
• "gfni"
• "vaes"
• "vpclmulqdq"
• "avx512vnni"
• "avx512bitalg"
• "avx512bf16"
• "avx512vp2intersect"
• "avx512fp16"
• "avxvnni"
• "avxifma"
• "avxneconvert"
• "avxvnniint8"
• "avxvnniint16"
• "amx-tile"
• "amx-int8"
• "amx-bf16"
• "amx-fp16"
• "amx-complex"
• "amx-avx512"
• "amx-fp8"
• "amx-movrs"
• "amx-tf32"
• "f16c"
• "fma"
• "bmi1"
• "bmi2"
• "abm"
• "lzcnt"
• "tbm"
• "popcnt"
• "fxsr"
• "xsave"
• "xsaveopt"
• "xsaves"
• "xsavec"
• "cmpxchg16b"
• "kl"
• "widekl"
• "adx"
• "rtm"
• "movbe"
• "ermsb"
• "movrs"
• "xop"