pub(crate) fn detect_features() -> cache::Initializer {
    let mut value = cache::Initializer::default();
    let enable_feature = |value: &mut cache::Initializer, f, enable| {
        if enable {
            value.set(f as u32);
        }
    };

    // The values are part of the platform-specific [asm/cputable.h][cputable]
    //
    // [cputable]: https://github.com/torvalds/linux/blob/master/arch/powerpc/include/uapi/asm/cputable.h
    if let Ok(auxv) = auxvec::auxv() {
        // note: the PowerPC values are the mask to do the test (instead of the
        // index of the bit to test like in ARM and Aarch64)
        enable_feature(&mut value, Feature::altivec, auxv.hwcap & 0x10000000 != 0);
        enable_feature(&mut value, Feature::vsx, auxv.hwcap & 0x00000080 != 0);
        enable_feature(&mut value, Feature::power8, auxv.hwcap2 & 0x80000000 != 0);
        return value;
    }

    // PowerPC's /proc/cpuinfo lacks a proper Feature field,
    // but `altivec` support is indicated in the `cpu` field.
    #[cfg(feature = "std_detect_file_io")]
    if let Ok(c) = super::cpuinfo::CpuInfo::new() {
        enable_feature(&mut value, Feature::altivec, c.field("cpu").has("altivec"));
        return value;
    }
    value
}
/// Try to read the features from the auxiliary vector, and if that fails, try
/// to read them from /proc/cpuinfo.
Try to read the features from the auxiliary vector, and if that fails, try
to read them from /proc/cpuinfo.
Try to read the features from the auxiliary vector and if that fails try to read them from / proc / cpuinfo .
pub(crate) fn detect_features() -> cache::Initializer {
    let mut value = cache::Initializer::default();
    let enable_feature = |value: &mut cache::Initializer, f, enable| {
        if enable {
            value.set(f as u32);
        }
    };
    // The values are part of the platform-specific [asm/cputable.h][cputable]
    //
    // [cputable]: https://github.com/torvalds/linux/blob/master/arch/powerpc/include/uapi/asm/cputable.h
    if let Ok(auxv) = auxvec::auxv() {
        // note: the PowerPC values are the mask to do the test (instead of the
        // index of the bit to test like in ARM and Aarch64)
        enable_feature(&mut value, Feature::altivec, auxv.hwcap & 0x10000000 != 0);
        enable_feature(&mut value, Feature::vsx, auxv.hwcap & 0x00000080 != 0);
        enable_feature(&mut value, Feature::power8, auxv.hwcap2 & 0x80000000 != 0);
        return value;
    }
    // PowerPC's /proc/cpuinfo lacks a proper Feature field,
    // but `altivec` support is indicated in the `cpu` field.
    #[cfg(feature = "std_detect_file_io")]
    if let Ok(c) = super::cpuinfo::CpuInfo::new() {
        enable_feature(&mut value, Feature::altivec, c.field("cpu").has("altivec"));
        return value;
    }
    value
}
pub ( crate ) fn detect_features ( ) -> cache :: Initializer { let mut value = cache :: Initializer :: default ( ) ; let enable_feature = | value : & mut cache :: Initializer , f , enable | { if enable { value . set ( f as u32 ) ; } } ; // The values are part of the platform-specific [asm/cputable.h][cputable] // // [cputable]: https://github.com/torvalds/linux/blob/master/arch/powerpc/include/uapi/asm/cputable.h if let Ok ( auxv ) = auxvec :: auxv ( ) { // note: the PowerPC values are the mask to do the test (instead of the // index of the bit to test like in ARM and Aarch64) enable_feature ( & mut value , Feature :: altivec , auxv . hwcap & 0x10000000 != 0 ) ; enable_feature ( & mut value , Feature :: vsx , auxv . hwcap & 0x00000080 != 0 ) ; enable_feature ( & mut value , Feature :: power8 , auxv . hwcap2 & 0x80000000 != 0 ) ; return value ; } // PowerPC's /proc/cpuinfo lacks a proper Feature field, // but `altivec` support is indicated in the `cpu` field. # [ cfg ( feature " " ) ] if let Ok ( c ) = super :: cpuinfo :: CpuInfo :: new ( ) { enable_feature ( & mut value , Feature :: altivec , c . field ( " " ) . has ( " " ) ) ; return value ; } value }
Try to read the features from the auxiliary vector, and if that fails, try
to read them from /proc/cpuinfo.
Try to read the features from the auxiliary vector and if that fails try to read them from / proc / cpuinfo .