serde_json/lexical/
shift.rs

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1// Adapted from https://github.com/Alexhuszagh/rust-lexical.
2
3//! Bit-shift helpers.
4
5use super::float::ExtendedFloat;
6use core::mem;
7
8// Shift extended-precision float right `shift` bytes.
9#[inline]
10pub(crate) fn shr(fp: &mut ExtendedFloat, shift: i32) {
11    let bits: u64 = mem::size_of::<u64>() as u64 * 8;
12    debug_assert!((shift as u64) < bits, "shr() overflow in shift right.");
13
14    fp.mant >>= shift;
15    fp.exp += shift;
16}
17
18// Shift extended-precision float right `shift` bytes.
19//
20// Accepts when the shift is the same as the type size, and
21// sets the value to 0.
22#[inline]
23pub(crate) fn overflowing_shr(fp: &mut ExtendedFloat, shift: i32) {
24    let bits: u64 = mem::size_of::<u64>() as u64 * 8;
25    debug_assert!(
26        (shift as u64) <= bits,
27        "overflowing_shr() overflow in shift right."
28    );
29
30    fp.mant = if shift as u64 == bits {
31        0
32    } else {
33        fp.mant >> shift
34    };
35    fp.exp += shift;
36}
37
38// Shift extended-precision float left `shift` bytes.
39#[inline]
40pub(crate) fn shl(fp: &mut ExtendedFloat, shift: i32) {
41    let bits: u64 = mem::size_of::<u64>() as u64 * 8;
42    debug_assert!((shift as u64) < bits, "shl() overflow in shift left.");
43
44    fp.mant <<= shift;
45    fp.exp -= shift;
46}
serde_json/lexical/shift.rs

serde_json/lexical/
shift.rs
