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use lapacke;
use super::{into_result, Transpose, UPLO};
use crate::error::*;
use crate::layout::MatrixLayout;
use crate::types::*;
#[derive(Debug, Clone, Copy)]
#[repr(u8)]
pub enum Diag {
Unit = b'U',
NonUnit = b'N',
}
pub trait Triangular_: Sized {
unsafe fn inv_triangular(l: MatrixLayout, uplo: UPLO, d: Diag, a: &mut [Self]) -> Result<()>;
unsafe fn solve_triangular(
al: MatrixLayout,
bl: MatrixLayout,
uplo: UPLO,
d: Diag,
a: &[Self],
b: &mut [Self],
) -> Result<()>;
}
macro_rules! impl_triangular {
($scalar:ty, $trtri:path, $trtrs:path) => {
impl Triangular_ for $scalar {
unsafe fn inv_triangular(l: MatrixLayout, uplo: UPLO, diag: Diag, a: &mut [Self]) -> Result<()> {
let (n, _) = l.size();
let lda = l.lda();
let info = $trtri(l.lapacke_layout(), uplo as u8, diag as u8, n, a, lda);
into_result(info, ())
}
unsafe fn solve_triangular(
al: MatrixLayout,
bl: MatrixLayout,
uplo: UPLO,
diag: Diag,
a: &[Self],
mut b: &mut [Self],
) -> Result<()> {
let (n, _) = al.size();
let lda = al.lda();
let (_, nrhs) = bl.size();
let ldb = bl.lda();
let info = $trtrs(
al.lapacke_layout(),
uplo as u8,
Transpose::No as u8,
diag as u8,
n,
nrhs,
a,
lda,
&mut b,
ldb,
);
into_result(info, ())
}
}
};
}
impl_triangular!(f64, lapacke::dtrtri, lapacke::dtrtrs);
impl_triangular!(f32, lapacke::strtri, lapacke::strtrs);
impl_triangular!(c64, lapacke::ztrtri, lapacke::ztrtrs);
impl_triangular!(c32, lapacke::ctrtri, lapacke::ctrtrs);