v7.rs.html -- source
Description: Source to the Rust file `libcore/../stdsimd/coresimd/arm/v7.rs`.
Keywords: rust, rustlang, rust-lang

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    //! ARMv7 intrinsics.
    //!
    //! The reference is [ARMv7-M Architecture Reference Manual (Issue
    //! E.b)][armv7m].
    //!
    //! [armv7m]:
    //! http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0403e.
    //! b/index.html

    pub use super::v6::*;

    #[cfg(test)]
    use stdsimd_test::assert_instr;

    /// Count Leading Zeros.
    #[inline]
    #[cfg_attr(target_arch = "arm", target_feature(enable = "v7"))]
    #[cfg_attr(all(test, target_arch = "aarch64"), assert_instr(clz))]
    // FIXME: https://github.com/rust-lang-nursery/stdsimd/issues/382
    // #[cfg_attr(all(test, target_arch = "arm"), assert_instr(clz))]
    pub unsafe fn _clz_u8(x: u8) -> u8 {
        x.leading_zeros() as u8
    }

    /// Count Leading Zeros.
    #[inline]
    #[cfg_attr(target_arch = "arm", target_feature(enable = "v7"))]
    #[cfg_attr(all(test, target_arch = "aarch64"), assert_instr(clz))]
    // FIXME: https://github.com/rust-lang-nursery/stdsimd/issues/382
    // #[cfg_attr(all(test, target_arch = "arm"), assert_instr(clz))]
    pub unsafe fn _clz_u16(x: u16) -> u16 {
        x.leading_zeros() as u16
    }

    /// Count Leading Zeros.
    #[inline]
    #[cfg_attr(target_arch = "arm", target_feature(enable = "v7"))]
    #[cfg_attr(all(test, target_arch = "aarch64"), assert_instr(clz))]
    // FIXME: https://github.com/rust-lang-nursery/stdsimd/issues/382
    // #[cfg_attr(all(test, target_arch = "arm"), assert_instr(clz))]
    pub unsafe fn _clz_u32(x: u32) -> u32 {
        x.leading_zeros() as u32
    }

    /// Reverse the bit order.
    #[inline]
    #[cfg_attr(target_arch = "arm", target_feature(enable = "v7"))]
    #[cfg_attr(test, assert_instr(rbit))]
    pub unsafe fn _rbit_u32(x: u32) -> u32 {
        use intrinsics::bitreverse;
        bitreverse(x)
    }

    #[cfg(test)]
    mod tests {
        use coresimd::arm::v7;

        #[test]
        fn _clz_u8() {
            unsafe {
                assert_eq!(v7::_clz_u8(0b0000_1010u8), 4u8);
            }
        }

        #[test]
        fn _clz_u16() {
            unsafe {
                assert_eq!(v7::_clz_u16(0b0000_1010u16), 12u16);
            }
        }

        #[test]
        fn _clz_u32() {
            unsafe {
                assert_eq!(v7::_clz_u32(0b0000_1010u32), 28u32);
            }
        }

        #[test]
        #[cfg(dont_compile_me)] // FIXME need to add `v7` upstream in rustc
        fn _rbit_u32() {
            unsafe {
                assert_eq!(
                    v7::_rbit_u32(0b0000_1010u32),
                    0b0101_0000_0000_0000_0000_0000_0000_0000u32
                );
            }
        }
    }

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