# Macro std::arch::is_x86_feature_detected

1.27.0 · source ·

    macro_rules! is_x86_feature_detected {
        ("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") => { ... };
        ("gfni") => { ... };
        ("vaes") => { ... };
        ("vpclmulqdq") => { ... };
        ("avx512vnni") => { ... };
        ("avx512bitalg") => { ... };
        ("avx512bf16") => { ... };
        ("avx512vp2intersect") => { ... };
        ("f16c") => { ... };
        ("fma") => { ... };
        ("bmi1") => { ... };
        ("bmi2") => { ... };
        ("lzcnt") => { ... };
        ("tbm") => { ... };
        ("popcnt") => { ... };
        ("fxsr") => { ... };
        ("xsave") => { ... };
        ("xsaveopt") => { ... };
        ("xsaves") => { ... };
        ("xsavec") => { ... };
        ("cmpxchg16b") => { ... };
        ("adx") => { ... };
        ("rtm") => { ... };
        ("movbe") => { ... };
        ("ermsb") => { ... };
        ("abm") => { ... };
        ("avx512gfni") => { ... };
        ("avx512vaes") => { ... };
        ("avx512vpclmulqdq") => { ... };
        ($t:tt,) => { ... };
        ($t:tt) => { ... };
    }

Available on x86 or x86-64 only.
Expand description

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.

### 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"`
- `"gfni"`
- `"vaes"`
- `"vpclmulqdq"`
- `"avx512vnni"`
- `"avx512bitalg"`
- `"avx512bf16"`
- `"avx512vp2intersect"`
- `"f16c"`
- `"fma"`
- `"bmi1"`
- `"bmi2"`
- `"abm"`
- `"lzcnt"`
- `"tbm"`
- `"popcnt"`
- `"fxsr"`
- `"xsave"`
- `"xsaveopt"`
- `"xsaves"`
- `"xsavec"`
- `"cmpxchg16b"`
- `"adx"`
- `"rtm"`
- `"movbe"`
- `"ermsb"`