pub(crate) fn detect_features() -> cache::Initializer {
    type DWORD = u32;
    type BOOL = i32;

    const FALSE: BOOL = 0;
    // The following Microsoft documents isn't updated for aarch64.
    // https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-isprocessorfeaturepresent
    // These are defined in winnt.h of Windows SDK
    const PF_ARM_NEON_INSTRUCTIONS_AVAILABLE: u32 = 19;
    const PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE: u32 = 30;
    const PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE: u32 = 31;

    extern "system" {
        pub fn IsProcessorFeaturePresent(ProcessorFeature: DWORD) -> BOOL;
    }

    let mut value = cache::Initializer::default();
    {
        let mut enable_feature = |f, enable| {
            if enable {
                value.set(f as u32);
            }
        };

        // Some features such Feature::fp may be supported on current CPU,
        // but no way to detect it by OS API.
        // Also, we require unsafe block for the extern "system" calls.
        unsafe {
            enable_feature(
                Feature::asimd,
                IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
            enable_feature(
                Feature::crc,
                IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
            // PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE means aes, sha1, sha2 and
            // pmull support
            enable_feature(
                Feature::aes,
                IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
            enable_feature(
                Feature::pmull,
                IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
            enable_feature(
                Feature::sha2,
                IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
        }
    }
    value
}
/// Try to read the features using IsProcessorFeaturePresent.
Try to read the features using IsProcessorFeaturePresent.
Try to read the features using IsProcessorFeaturePresent .
pub(crate) fn detect_features() -> cache::Initializer {
    type DWORD = u32;
    type BOOL = i32;
    const FALSE: BOOL = 0;
    // The following Microsoft documents isn't updated for aarch64.
    // https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-isprocessorfeaturepresent
    // These are defined in winnt.h of Windows SDK
    const PF_ARM_NEON_INSTRUCTIONS_AVAILABLE: u32 = 19;
    const PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE: u32 = 30;
    const PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE: u32 = 31;
    extern "system" {
        pub fn IsProcessorFeaturePresent(ProcessorFeature: DWORD) -> BOOL;
    }
    let mut value = cache::Initializer::default();
    {
        let mut enable_feature = |f, enable| {
            if enable {
                value.set(f as u32);
            }
        };
        // Some features such Feature::fp may be supported on current CPU,
        // but no way to detect it by OS API.
        // Also, we require unsafe block for the extern "system" calls.
        unsafe {
            enable_feature(
                Feature::asimd,
                IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
            enable_feature(
                Feature::crc,
                IsProcessorFeaturePresent(PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
            // PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE means aes, sha1, sha2 and
            // pmull support
            enable_feature(
                Feature::aes,
                IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
            enable_feature(
                Feature::pmull,
                IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
            enable_feature(
                Feature::sha2,
                IsProcessorFeaturePresent(PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) != FALSE,
            );
        }
    }
    value
}
pub ( crate ) fn detect_features ( ) -> cache :: Initializer { type DWORD = u32 ; type BOOL = i32 ; const FALSE : BOOL = 0 ; // The following Microsoft documents isn't updated for aarch64. // https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-isprocessorfeaturepresent // These are defined in winnt.h of Windows SDK const PF_ARM_NEON_INSTRUCTIONS_AVAILABLE : u32 = 19 ; const PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE : u32 = 30 ; const PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE : u32 = 31 ; extern " " { pub fn IsProcessorFeaturePresent ( ProcessorFeature : DWORD ) -> BOOL ; } let mut value = cache :: Initializer :: default ( ) ; { let mut enable_feature = | f , enable | { if enable { value . set ( f as u32 ) ; } } ; // Some features such Feature::fp may be supported on current CPU, // but no way to detect it by OS API. // Also, we require unsafe block for the extern "system" calls. unsafe { enable_feature ( Feature :: asimd , IsProcessorFeaturePresent ( PF_ARM_NEON_INSTRUCTIONS_AVAILABLE ) != FALSE , ) ; enable_feature ( Feature :: crc , IsProcessorFeaturePresent ( PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE ) != FALSE , ) ; // PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE means aes, sha1, sha2 and // pmull support enable_feature ( Feature :: aes , IsProcessorFeaturePresent ( PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE ) != FALSE , ) ; enable_feature ( Feature :: pmull , IsProcessorFeaturePresent ( PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE ) != FALSE , ) ; enable_feature ( Feature :: sha2 , IsProcessorFeaturePresent ( PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE ) != FALSE , ) ; } } value }
Try to read the features using IsProcessorFeaturePresent.
Try to read the features using IsProcessorFeaturePresent .