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use crate::{error::*, layout::MatrixLayout, *};
use cauchy::*;
use num_traits::{ToPrimitive, Zero};
#[derive(Clone, Copy, Eq, PartialEq)]
#[repr(u8)]
pub enum UVTFlag {
Full = b'A',
Some = b'S',
None = b'N',
}
pub trait SVDDC_: Scalar {
fn svddc(l: MatrixLayout, jobz: UVTFlag, a: &mut [Self]) -> Result<SVDOutput<Self>>;
}
macro_rules! impl_svddc {
(@real, $scalar:ty, $gesdd:path) => {
impl_svddc!(@body, $scalar, $gesdd, );
};
(@complex, $scalar:ty, $gesdd:path) => {
impl_svddc!(@body, $scalar, $gesdd, rwork);
};
(@body, $scalar:ty, $gesdd:path, $($rwork_ident:ident),*) => {
impl SVDDC_ for $scalar {
fn svddc(l: MatrixLayout, jobz: UVTFlag, mut a: &mut [Self],) -> Result<SVDOutput<Self>> {
let m = l.lda();
let n = l.len();
let k = m.min(n);
let mut s = unsafe { vec_uninit( k as usize) };
let (u_col, vt_row) = match jobz {
UVTFlag::Full | UVTFlag::None => (m, n),
UVTFlag::Some => (k, k),
};
let (mut u, mut vt) = match jobz {
UVTFlag::Full => (
Some(unsafe { vec_uninit( (m * m) as usize) }),
Some(unsafe { vec_uninit( (n * n) as usize) }),
),
UVTFlag::Some => (
Some(unsafe { vec_uninit( (m * u_col) as usize) }),
Some(unsafe { vec_uninit( (n * vt_row) as usize) }),
),
UVTFlag::None => (None, None),
};
$( let mx = n.max(m) as usize;
let mn = n.min(m) as usize;
let lrwork = match jobz {
UVTFlag::None => 7 * mn,
_ => std::cmp::max(5*mn*mn + 5*mn, 2*mx*mn + 2*mn*mn + mn),
};
let mut $rwork_ident = unsafe { vec_uninit( lrwork) };
)*
let mut info = 0;
let mut iwork = unsafe { vec_uninit( 8 * k as usize) };
let mut work_size = [Self::zero()];
unsafe {
$gesdd(
jobz as u8,
m,
n,
&mut a,
m,
&mut s,
u.as_mut().map(|x| x.as_mut_slice()).unwrap_or(&mut []),
m,
vt.as_mut().map(|x| x.as_mut_slice()).unwrap_or(&mut []),
vt_row,
&mut work_size,
-1,
$(&mut $rwork_ident,)*
&mut iwork,
&mut info,
);
}
info.as_lapack_result()?;
let lwork = work_size[0].to_usize().unwrap();
let mut work = unsafe { vec_uninit( lwork) };
unsafe {
$gesdd(
jobz as u8,
m,
n,
&mut a,
m,
&mut s,
u.as_mut().map(|x| x.as_mut_slice()).unwrap_or(&mut []),
m,
vt.as_mut().map(|x| x.as_mut_slice()).unwrap_or(&mut []),
vt_row,
&mut work,
lwork as i32,
$(&mut $rwork_ident,)*
&mut iwork,
&mut info,
);
}
info.as_lapack_result()?;
match l {
MatrixLayout::F { .. } => Ok(SVDOutput { s, u, vt }),
MatrixLayout::C { .. } => Ok(SVDOutput { s, u: vt, vt: u }),
}
}
}
};
}
impl_svddc!(@real, f32, lapack::sgesdd);
impl_svddc!(@real, f64, lapack::dgesdd);
impl_svddc!(@complex, c32, lapack::cgesdd);
impl_svddc!(@complex, c64, lapack::zgesdd);