ryu_js/pretty/
exponent.rs

1use crate::digit_table::DIGIT_TABLE;
2use core::ptr;
3
4#[cfg_attr(feature = "no-panic", inline)]
5pub unsafe fn write_exponent3(mut k: isize, mut result: *mut u8) -> usize {
6    let sign = k < 0;
7    if sign {
8        *result = b'-';
9        result = result.offset(1);
10        k = -k;
11    } else {
12        *result = b'+';
13        result = result.offset(1);
14    }
15
16    debug_assert!(k < 1000);
17    if k >= 100 {
18        *result = b'0' + (k / 100) as u8;
19        k %= 100;
20        let d = DIGIT_TABLE.as_ptr().offset(k * 2);
21        ptr::copy_nonoverlapping(d, result.offset(1), 2);
22        4
23    } else if k >= 10 {
24        let d = DIGIT_TABLE.as_ptr().offset(k * 2);
25        ptr::copy_nonoverlapping(d, result, 2);
26        3
27    } else {
28        *result = b'0' + k as u8;
29        2
30    }
31}
32
33#[cfg_attr(feature = "no-panic", inline)]
34pub unsafe fn write_exponent2(mut k: isize, mut result: *mut u8) -> usize {
35    let sign = k < 0;
36    if sign {
37        *result = b'-';
38        result = result.offset(1);
39        k = -k;
40    } else {
41        *result = b'+';
42        result = result.offset(1);
43    }
44
45    debug_assert!(k < 100);
46    if k >= 10 {
47        let d = DIGIT_TABLE.as_ptr().offset(k * 2);
48        ptr::copy_nonoverlapping(d, result, 2);
49        3
50    } else {
51        *result = b'0' + k as u8;
52        2
53    }
54}
ryu_js/pretty/exponent.rs

ryu_js/pretty/
exponent.rs
