mantissa.rs.html -- source

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rustros_tf

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yaml_rust

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use core::ptr;

use digit_table::*;

#[cfg_attr(feature = "no-panic", inline)]
pub unsafe fn write_mantissa_long(mut output: u64, mut result: *mut u8) {
    if (output >> 32) != 0 {
        // One expensive 64-bit division.
        let mut output2 = (output - 100_000_000 * (output / 100_000_000)) as u32;
        output /= 100_000_000;

        let c = output2 % 10_000;
        output2 /= 10_000;
        let d = output2 % 10_000;
        let c0 = (c % 100) << 1;
        let c1 = (c / 100) << 1;
        let d0 = (d % 100) << 1;
        let d1 = (d / 100) << 1;
        ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c0 as usize), result.offset(-2), 2);
        ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c1 as usize), result.offset(-4), 2);
        ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(d0 as usize), result.offset(-6), 2);
        ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(d1 as usize), result.offset(-8), 2);
        result = result.offset(-8);
    }
    write_mantissa(output as u32, result);
}

#[cfg_attr(feature = "no-panic", inline)]
pub unsafe fn write_mantissa(mut output: u32, mut result: *mut u8) {
    while output >= 10_000 {
        let c = (output - 10_000 * (output / 10_000)) as u32;
        output /= 10_000;
        let c0 = (c % 100) << 1;
        let c1 = (c / 100) << 1;
        ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c0 as usize), result.offset(-2), 2);
        ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c1 as usize), result.offset(-4), 2);
        result = result.offset(-4);
    }
    if output >= 100 {
        let c = ((output % 100) << 1) as u32;
        output /= 100;
        ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c as usize), result.offset(-2), 2);
        result = result.offset(-2);
    }
    if output >= 10 {
        let c = (output << 1) as u32;
        ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c as usize), result.offset(-2), 2);
    } else {
        *result.offset(-1) = b'0' + output as u8;
    }
}

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