1 use crate::digit_table::*;
2 use core::ptr;
3
4 #[cfg_attr(feature = "no-panic", inline)]
write_mantissa_long(mut output: u64, mut result: *mut u8)5 pub unsafe fn write_mantissa_long(mut output: u64, mut result: *mut u8) {
6 if (output >> 32) != 0 {
7 // One expensive 64-bit division.
8 let mut output2 = (output - 100_000_000 * (output / 100_000_000)) as u32;
9 output /= 100_000_000;
10
11 let c = output2 % 10_000;
12 output2 /= 10_000;
13 let d = output2 % 10_000;
14 let c0 = (c % 100) << 1;
15 let c1 = (c / 100) << 1;
16 let d0 = (d % 100) << 1;
17 let d1 = (d / 100) << 1;
18 ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c0 as usize), result.offset(-2), 2);
19 ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c1 as usize), result.offset(-4), 2);
20 ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(d0 as usize), result.offset(-6), 2);
21 ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(d1 as usize), result.offset(-8), 2);
22 result = result.offset(-8);
23 }
24 write_mantissa(output as u32, result);
25 }
26
27 #[cfg_attr(feature = "no-panic", inline)]
write_mantissa(mut output: u32, mut result: *mut u8)28 pub unsafe fn write_mantissa(mut output: u32, mut result: *mut u8) {
29 while output >= 10_000 {
30 let c = (output - 10_000 * (output / 10_000)) as u32;
31 output /= 10_000;
32 let c0 = (c % 100) << 1;
33 let c1 = (c / 100) << 1;
34 ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c0 as usize), result.offset(-2), 2);
35 ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c1 as usize), result.offset(-4), 2);
36 result = result.offset(-4);
37 }
38 if output >= 100 {
39 let c = ((output % 100) << 1) as u32;
40 output /= 100;
41 ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c as usize), result.offset(-2), 2);
42 result = result.offset(-2);
43 }
44 if output >= 10 {
45 let c = (output << 1) as u32;
46 ptr::copy_nonoverlapping(DIGIT_TABLE.get_unchecked(c as usize), result.offset(-2), 2);
47 } else {
48 *result.offset(-1) = b'0' + output as u8;
49 }
50 }
51