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Merge pull request rust-lang/libm#277 from TDecki/patch-1

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Amanieu d'Antras 2023-02-18 19:30:13 +01:00 • committed by GitHub
commit 2a4ca37a63
1 changed files with 3 additions and 14 deletions
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17
library/compiler-builtins/libm/src/math/fma.rs
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@ -29,21 +29,10 @@ fn normalize(x: f64) -> Num {
Num { m: ix, e, sign }
}
#[inline]
fn mul(x: u64, y: u64) -> (u64, u64) {
let t1: u64;
let t2: u64;
let t3: u64;
let xlo: u64 = x as u32 as u64;
let xhi: u64 = x >> 32;
let ylo: u64 = y as u32 as u64;
let yhi: u64 = y >> 32;
t1 = xlo * ylo;
t2 = xlo * yhi + xhi * ylo;
t3 = xhi * yhi;
let lo = t1.wrapping_add(t2 << 32);
let hi = t3 + (t2 >> 32) + (t1 > lo) as u64;
(hi, lo)
let t = (x as u128).wrapping_mul(y as u128);
((t >> 64) as u64, t as u64)
}
/// Floating multiply add (f64)