     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

    //! Run-time feature detection

    mod cache;
    mod bit;

    cfg_if! {
        if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
            #[path = "x86.rs"]
            mod arch;
        } else if #[cfg(target_arch = "arm")] {
            #[path = "arm.rs"]
            mod arch;
        } else if #[cfg(target_arch = "aarch64")] {
            #[path = "aarch64.rs"]
            mod arch;
        } else if #[cfg(target_arch = "powerpc64")] {
            #[path = "powerpc64.rs"]
            mod arch;
        } else {
            mod arch {
                pub enum Feature {
                    Null
                }
                pub fn detect_features() -> super::cache::Initializer {
                    Default::default()
                }
            }
        }
    }

    mod linux;

    pub use self::arch::Feature;

    /// Performs run-time feature detection.
    pub fn check_for(x: Feature) -> bool {
        cache::test(x as u32, arch::detect_features)
    }

# 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`)