const_soft_float/soft_f32/
trunc.rs

1use super::SoftF32;
2
3pub(crate) const fn trunc(x: SoftF32) -> SoftF32 {
4    let mut i: u32 = x.to_bits();
5    let mut e: i32 = (i >> 23 & 0xff) as i32 - 0x7f + 9;
6    let m: u32;
7
8    if e >= 23 + 9 {
9        return x;
10    }
11    if e < 9 {
12        e = 1;
13    }
14    m = -1i32 as u32 >> e;
15    if (i & m) == 0 {
16        return x;
17    }
18    i &= !m;
19    SoftF32::from_bits(i)
20}
21
22#[cfg(test)]
23mod tests {
24    use crate::soft_f32::SoftF32;
25
26    #[test]
27    fn sanity_check() {
28        assert_eq!(super::trunc(SoftF32(1.1)).0, 1.0);
29    }
30}