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Use the right target ratio in Algorithm M quickstart. 

Using f64's bit size probably wasn't actually *wrong*, but it would overshoot for no reason. This might have slowed down f32 parsing significantly.
This commit is contained in:
Robin Kruppe 2016-01-26 22:08:01 +01:00
parent 13b5edab63
commit 25c9ac3280
1 changed files with 1 additions and 1 deletions
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src/libcore/num/dec2flt/algorithm.rs
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@ -278,7 +278,7 @@ fn quick_start<T: RawFloat>(u: &mut Big, v: &mut Big, k: &mut i16) {
// The target ratio is one where u/v is in an in-range significand. Thus our termination
// condition is log2(u / v) being the significand bits, plus/minus one.
// FIXME Looking at the second bit could improve the estimate and avoid some more divisions.
let target_ratio = f64::sig_bits() as i16;
let target_ratio = T::sig_bits() as i16;
let log2_u = u.bit_length() as i16;
let log2_v = v.bit_length() as i16;
let mut u_shift: i16 = 0;