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use lapacke;
use num_traits::Zero;
use crate::error::*;
use crate::layout::MatrixLayout;
use crate::types::*;
use super::NormType;
use super::{into_result, Pivot, Transpose};
pub trait Solve_: Scalar + Sized {
unsafe fn lu(l: MatrixLayout, a: &mut [Self]) -> Result<Pivot>;
unsafe fn inv(l: MatrixLayout, a: &mut [Self], p: &Pivot) -> Result<()>;
unsafe fn rcond(l: MatrixLayout, a: &[Self], anorm: Self::Real) -> Result<Self::Real>;
unsafe fn solve(l: MatrixLayout, t: Transpose, a: &[Self], p: &Pivot, b: &mut [Self]) -> Result<()>;
}
macro_rules! impl_solve {
($scalar:ty, $getrf:path, $getri:path, $gecon:path, $getrs:path) => {
impl Solve_ for $scalar {
unsafe fn lu(l: MatrixLayout, a: &mut [Self]) -> Result<Pivot> {
let (row, col) = l.size();
let k = ::std::cmp::min(row, col);
let mut ipiv = vec![0; k as usize];
let info = $getrf(l.lapacke_layout(), row, col, a, l.lda(), &mut ipiv);
into_result(info, ipiv)
}
unsafe fn inv(l: MatrixLayout, a: &mut [Self], ipiv: &Pivot) -> Result<()> {
let (n, _) = l.size();
let info = $getri(l.lapacke_layout(), n, a, l.lda(), ipiv);
into_result(info, ())
}
unsafe fn rcond(l: MatrixLayout, a: &[Self], anorm: Self::Real) -> Result<Self::Real> {
let (n, _) = l.size();
let mut rcond = Self::Real::zero();
let info = $gecon(
l.lapacke_layout(),
NormType::One as u8,
n,
a,
l.lda(),
anorm,
&mut rcond,
);
into_result(info, rcond)
}
unsafe fn solve(l: MatrixLayout, t: Transpose, a: &[Self], ipiv: &Pivot, b: &mut [Self]) -> Result<()> {
let (n, _) = l.size();
let nrhs = 1;
let ldb = 1;
let info = $getrs(l.lapacke_layout(), t as u8, n, nrhs, a, l.lda(), ipiv, b, ldb);
into_result(info, ())
}
}
};
}
impl_solve!(f64, lapacke::dgetrf, lapacke::dgetri, lapacke::dgecon, lapacke::dgetrs);
impl_solve!(f32, lapacke::sgetrf, lapacke::sgetri, lapacke::sgecon, lapacke::sgetrs);
impl_solve!(c64, lapacke::zgetrf, lapacke::zgetri, lapacke::zgecon, lapacke::zgetrs);
impl_solve!(c32, lapacke::cgetrf, lapacke::cgetri, lapacke::cgecon, lapacke::cgetrs);