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return fixed length array and len to avoid heap allocation

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Quaternions 2023-10-26 18:09:58 -07:00
parent 08d4e7d997
commit 01a8efe4d4
1 changed files with 15 additions and 15 deletions
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30
src/zeroes.rs
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@ -2,31 +2,31 @@
use crate::integer::Planar64; use crate::integer::Planar64;
#[inline] #[inline]
pub fn zeroes2(a0:Planar64,a1:Planar64,a2:Planar64) -> Vec<Planar64>{ pub fn zeroes2<'a>(a0:Planar64,a1:Planar64,a2:Planar64)->&'a [Planar64]{
if a2==Planar64::ZERO{ if a2==Planar64::ZERO{
return zeroes1(a0, a1); return zeroes1(a0,a1);
} }
let radicand=a1.get() as i128*a1.get() as i128-a2.get() as i128*a0.get() as i128*4; let radicand=a1.get() as i128*a1.get() as i128-a2.get() as i128*a0.get() as i128*4;
if 0<radicand { if 0<radicand{
//start with f64 sqrt //start with f64 sqrt
let planar_radicand=Planar64::raw(unsafe{(radicand as f64).sqrt().to_int_unchecked()}); let planar_radicand=Planar64::raw(unsafe{(radicand as f64).sqrt().to_int_unchecked()});
//TODO: one or two newtons //TODO: one or two newtons
if Planar64::ZERO<a2 { if Planar64::ZERO<a2{
return vec![(-a1-planar_radicand)/(a2*2),(-a1+planar_radicand)/(a2*2)]; &[(-a1-planar_radicand)/(a2*2),(-a1+planar_radicand)/(a2*2)]
} else { }else{
return vec![(-a1+planar_radicand)/(a2*2),(-a1-planar_radicand)/(a2*2)]; &[(-a1+planar_radicand)/(a2*2),(-a1-planar_radicand)/(a2*2)]
} }
} else if radicand==0 { }else if radicand==0{
return vec![a1/(a2*-2)]; &[a1/(a2*-2)]
} else { }else{
return vec![]; &[]
} }
} }
#[inline] #[inline]
pub fn zeroes1(a0:Planar64,a1:Planar64) -> Vec<Planar64> { pub fn zeroes1<'a>(a0:Planar64,a1:Planar64)->&'a [Planar64]{
if a1==Planar64::ZERO{ if a1==Planar64::ZERO{
return vec![]; &[]
} else { }else{
return vec![-a0/a1]; &[-a0/a1]
} }
} }