src/libcompiler_builtins/libm/src/math/ceilf.rs

   1 use core::f32;
   2
   3 #[inline]
   4 pub fn ceilf(x: f32) -> f32 {
   5     let mut ui = x.to_bits();
   6     let e = (((ui >> 23) & 0xff) - 0x7f) as i32;
   7
   8     if e >= 23 {
   9         return x;
  10     }
  11     if e >= 0 {
  12         let m = 0x007fffff >> e;
  13         if (ui & m) == 0 {
  14             return x;
  15         }
  16         force_eval!(x + f32::from_bits(0x7b800000));
  17         if ui >> 31 == 0 {
  18             ui += m;
  19         }
  20         ui &= !m;
  21     } else {
  22         force_eval!(x + f32::from_bits(0x7b800000));
  23         if ui >> 31 != 0 {
  24             return -0.0;
  25         } else if ui << 1 != 0 {
  26             return 1.0;
  27         }
  28     }
  29     return f32::from_bits(ui);
  30 }